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Sample records for river-floodplain system danube

  1. pCO2 and enzymatic activity in a river floodplain system of the Danube under different hydrological settings.

    Science.gov (United States)

    Sieczko, Anna; Demeter, Katalin; Mayr, Magdalena; Meisterl, Karin; Peduzzi, Peter

    2014-05-01

    Surface waters may serve as either sinks or sources of CO2. In contrast to rivers, which are typically sources of CO2 to the atmosphere, the role of fringing floodplains in CO2 flux is largely understudied. This study was conducted in a river-floodplain system near Vienna (Austria). The sampling focused on changing hydrological situations, particularly on two distinct flood events: a typical 1-year flood in 2012 and an extraordinary 100-year flood in 2013. One objective was to determine partial pressure of CO2 (pCO2) in floodplain lakes with different degree of connectivity to the main channel, and compare the impact of these two types of floods. Another aim was to decipher which fraction of the dissolved organic matter (DOM) pool contributed to pCO2 by linking pCO2 with optical properties of DOM and extracellular enzymatic activity (EEA) of microbes. The EEA is a valuable tool, especially for assessing the non-chromophoric but rapidly utilized DOM-fraction during floods. In 2012 and 2013, the floodplain lakes were dominated by supersaturated pCO2 conditions, which indicates that they served as CO2 sources. Surprisingly, there were no significant differences in pCO2 between the two types of flood. Our findings imply that the extent of the flood had minor impact on pCO2, but the general occurrence of a flood appears to be important. During the flood in 2013 significantly more dissolved organic carbon (DOC) (pcarbohydrates.

  2. Origin, enzymatic response and fate of dissolved organic matter during flood and non-flood conditions in a river-floodplain system of the Danube (Austria).

    Science.gov (United States)

    Sieczko, Anna; Peduzzi, Peter

    2014-01-01

    Spectroscopic techniques and extracellular enzyme activity measurements were combined with assessments of bacterial secondary production (BSP) to elucidate flood-pulse-linked differences in carbon (C) sources and related microbial processes in a river-floodplain system near Vienna (Austria). Surface connection with the main channel significantly influenced the quantity and quality of dissolved organic matter (DOM) in floodplain backwaters. The highest values of dissolved organic carbon (DOC) and chromophoric DOM (CDOM) were observed during the peak of the flood, when DOC increased from 1.36 to 4.37 mg l -1 and CDOM from 2.94 to 14.32 m -1 . The flood introduced DOC which consisted of more allochthonously-derived, aromatic compounds. Bacterial enzymatic activity, as a proxy to track the response to changes in DOM, indicated elevated utilization of imported allochthonous material. Based on the enzyme measurements, new parameters were calculated: metabolic effort and enzymatic indices (EEA 1 and EEA 2). During connection, bacterial glucosidase and protease activity were dominant, whereas during disconnected phases a switch to lignin degradation (phenol oxidase) occurred. The enzymatic activity analysis revealed that flooding mobilized reactive DOM, which then supported bacterial metabolism. No significant differences in overall BSP between the two phases were detected, indicating that heterogeneous sources of C sufficiently support BSP. The study demonstrates that floods are important for delivering DOM, which, despite its allochthonous origin, is reactive and can be effectively utilized by aquatic bacteria in this river-floodplain systems. The presence of active floodplains, characterized by hydrological connectivity with the main channel, creates the opportunity to process allochthonous DOC. This has potential consequences for carbon flux, enhancing C sequestration and mineralization processes in this river-floodplain system.

  3. Assessment of flood-induced changes of phytoplankton along a river-floodplain system using the morpho-functional approach.

    Science.gov (United States)

    Mihaljević, Melita; Spoljarić, Dubravka; Stević, Filip; Zuna Pfeiffer, Tanja

    2013-10-01

    In this research, we aimed to find out how the differences in hydrological connectivity between the main river channel and adjacent floodplain influence the changes in phytoplankton community structure along a river-floodplain system. The research was performed in the River Danube floodplain (Croatian river section) in the period 2008-2009 characterised by different flooding pattern on an annual time scale. By utilising the morpho-functional approach and multivariate analyses, the flood-derived structural changes of phytoplankton were analysed. The lake stability during the isolation phase triggered the specific pattern of morpho-functional groups (MFG) which were characterised by cyanobacterial species achieving very high biomass. Adversely, the high water turbulence in the lake during the frequent and extreme flooding led to evident similarity between lake and river assemblages. Besides different diatom species (groups of small and large centrics and pennates), which are the most abundant representatives in the river phytoplankton, many other groups such as cryptophytes and colonial phytomonads appeared to indicate altered conditions in the floodplain driven by flooding. Having different functional properties, small centric diatom taxa sorted to only one MFG cannot clearly reflect environmental changes that are shown by the species-level pattern. Disadvantages in using the MFG approach highlight that it is still necessary to combine it with taxonomical approach in monitoring of phytoplankton in the river-floodplain ecosystems.

  4. Hydrodynamic modeling of hydrologic surface connectivity within a coastal river-floodplain system

    Science.gov (United States)

    Castillo, C. R.; Guneralp, I.

    2017-12-01

    Hydrologic surface connectivity (HSC) within river-floodplain environments is a useful indicator of the overall health of riparian habitats because it allows connections amongst components/landforms of the riverine landscape system to be quantified. Overbank flows have traditionally been the focus for analyses concerned with river-floodplain connectivity, but recent works have identified the large significance from sub-bankfull streamflows. Through the use of morphometric analysis and a digital elevation model that is relative to the river water surface, we previously determined that >50% of the floodplain for Mission River on the Coastal Bend of Texas becomes connected to the river at streamflows well-below bankfull conditions. Guided by streamflow records, field-based inundation data, and morphometric analysis; we develop a two-dimensional hydrodynamic model for lower portions of Mission River Floodplain system. This model not only allows us to analyze connections induced by surface water inundation, but also other aspects of the hydrologic connectivity concept such as exchanges of sediment and energy between the river and its floodplain. We also aggregate hydrodynamic model outputs to an object/landform level in order to analyze HSC and associated attributes using measures from graph/network theory. Combining physically-based hydrodynamic models with object-based and graph theoretical analyses allow river-floodplain connectivity to be quantified in a consistent manner with measures/indicators commonly used in landscape analysis. Analyzes similar to ours build towards the establishment of a formal framework for analyzing river-floodplain interaction that will ultimately serve to inform the management of riverine/floodplain environments.

  5. Hydromorphological control of nutrient cycling in complex river floodplain systems

    Science.gov (United States)

    Hein, T.; Bondar-Kunze, E.; Felkl, M.; Habersack, H.; Mair, M.; Pinay, G.; Tritthart, M.; Welti, N.

    2009-04-01

    potential effects on the main channel in a large river, the Danube River. During the growing season of 2006 and the end of the growing season 2007, a large-scale field survey was completed for two areas in the floodplain stretch of the Danube River one of which has recently undergone restoration via reconnection to the Danube River main channel. The sampling compared the sediment nutrient concentrations and potential denitrification and respiration rates. With changing surface water connection to the Danube River, the water bodies in the two compared floodplains experienced different patterns of microbial processing rates, particularly potential denitrification. We demonstrate that principles of hydromorphological dynamics control nutrient cycling in the water column and at the water sediment interface. These findings confirm the environmental control on these processes and their potential use as proxies to assess the consequences of hydrological changes by restoration measures on river ecosystem functioning.

  6. Linking Flow Regime, Floodplain Lake Connectivity and Fish Catch in a Large River-Floodplain System, the Volga-Akhtuba Floodplain (Russian Federation)

    NARCIS (Netherlands)

    Wolfshaar, van de K.E.; Middelkoop, H.; Addink, E.; Winter, H.V.; Nagelkerke, L.A.J.

    2011-01-01

    River-floodplain systems are amongst the most productive—but often severely impacted—aquatic systems worldwide. We explored the ecological response of fish to flow regime in a large river-floodplain system by studying the relationships between (1) discharge and inundated floodplain area, with a

  7. Linking Flow Regime, Floodplain Lake Connectivity and Fish Catch in a Large River-Floodplain System, the Volga–Akhtuba Floodplain (Russian Federation)

    NARCIS (Netherlands)

    Wolfshaar, K.E. van de; Middelkoop, H.; Addink, E.A.; Winter, H.V.; Nagelkerke, L.A.J.

    2011-01-01

    River-floodplain systems are amongst the most productive—but often severely impacted—aquatic systems worldwide. We explored the ecological response of fish to flow regime in a large riverfloodplain system by studying the relationships between (1) discharge and inundated floodplain area, with a

  8. How do long-term development and periodical changes of river-floodplain systems affect the fate of contaminants? Results from European rivers

    International Nuclear Information System (INIS)

    Lair, G.J.; Zehetner, F.; Fiebig, M.; Gerzabek, M.H.; Gestel, C.A.M. van; Hein, T.; Hohensinner, S.; Hsu, P.; Jones, K.C.; Jordan, G.; Koelmans, A.A.

    2009-01-01

    In many densely populated areas, riverine floodplains have been strongly impacted and degraded by river channelization and flood protection dikes. Floodplains act as buffers for flood water and as filters for nutrients and pollutants carried with river water and sediment from upstream source areas. Based on results of the EU-funded 'AquaTerra' project (2004-2009), we analyze changes in the dynamics of European river-floodplain systems over different temporal scales and assess their effects on contaminant behaviour and ecosystem functioning. We find that human-induced changes in the hydrologic regime of rivers have direct and severe consequences on nutrient cycling and contaminant retention in adjacent floodplains. We point out the complex interactions of contaminants with nutrient availability and other physico-chemical characteristics (pH, organic matter) in determining ecotoxicity and habitat quality, and draw conclusions for improved floodplain management. - Human activities have changed the hydraulics and contaminant fate in river-floodplain ecosystems.

  9. Limnology of the Touw River floodplain

    CSIR Research Space (South Africa)

    Allanson, BR

    1983-12-01

    Full Text Available stream_source_info THE LIMNOLOGY OF THE TOUW RIVER FLOODPLAIN.pdf.txt stream_content_type text/plain stream_size 41 Content-Encoding ISO-8859-1 stream_name THE LIMNOLOGY OF THE TOUW RIVER FLOODPLAIN.pdf.txt Content-Type text.../plain; charset=ISO-8859-1 ...

  10. A Trans-disciplinary Hydrogeological Systems Analysis Approach for Identifying and Assessing Managed Aquifer Recharge Options: Example from the Darling River Floodplain, N.S.W., Australia

    Science.gov (United States)

    Lawrie, K.; Brodie, R. S.; Tan, K. P.; Halas, L.; Magee, J.; Gow, L.; Christensen, N. B.

    2013-12-01

    Surface water availability and quality generally limits managed aquifer recharge (MAR) opportunities in inland Australia's highly salinized landscapes and groundwater systems. Economic factors also commonly limit MAR investigations to shallow freshwater groundwater systems near existing infrastructure. Aquifer opportunities lie mainly in zones of fresh groundwater in relatively thin fluvial sedimentary aquifer systems with highly variable hydraulic properties. As part of a broader strategy to identify water savings in the Murray-Darling Basin, the Broken Hill Managed Aquifer Recharge (BHMAR) project was tasked with identifying and assessing MAR and/or groundwater extraction options to reduce evaporative losses from existing surface water storages, secure Broken Hill's water supply, protect the local environment and heritage, and return water to the river system. A trans-disciplinary research approach was used to identify and assess MAR options across a broad area of the Darling River floodplain. This methodology enabled the team to recognise fundamental problems in discipline approaches, helped identify critical data gaps, led to significant innovation across discipline boundaries, was critical in the development of a new hydrogeological conceptual model, facilitated development of new models of landscape, geological and tectonic evolution of the study area, and enabled completion of pre-commissioning maximal and residual MAR risk assessments. An airborne electromagnetics (AEM) survey, acquired over a large (>7,500 sq km) area of the Darling Floodplain, enabled rapid identification of a multi-layer sequence of aquifers and aquitards, while a phased assessment methodology was developed to rapidly identify and assess over 30 potential MAR targets (largely in fresh groundwater zones within palaeochannels and at palaeochannel confluences). Hydraulic properties were confirmed by a 7.5 km drilling program (100 sonic and rotary mud holes), and complementary field

  11. Restoring Oaks in the Missouri River Floodplain

    Science.gov (United States)

    Dan Dey; John Kabrick; Jennifer Grabner; Mike Gold

    2001-01-01

    Restoration of native vegetation and hydrologic regimes in the Mississippi and Missouri River floodplains is problematic because they are among the most altered ecosystems in North America (Noss et al. 1995), and because of the competing demands placed on these river ecosystems by commercial, private and social interests. Since the 1780s, more than half (53 percent) of...

  12. Evaluating the role of river-floodplain connectivity in providing beneficial hydrologic services in mountain landscapes

    Science.gov (United States)

    Covino, T. P.; Wegener, P.; Weiss, T.; Wohl, E.; Rhoades, C.

    2017-12-01

    River networks of mountain landscapes tend to be dominated by steep, valley-confined channels that have limited floodplain area and low hydrologic buffering capacity. Interspersed between the narrow segments are wide, low-gradient segments where extensive floodplains, wetlands, and riparian areas can develop. Although they tend to be limited in their frequency relative to the narrow valley segments, the low-gradient, wide portions of mountain channel networks can be particularly important to hydrologic buffering and can be sites of high nutrient retention and ecosystem productivity. Hydrologic buffering along the wide valley segments is dependent on lateral hydrologic connectivity between the river and floodplain, however these connections have been increasingly severed as a result of various land and water management practices. We evaluated the role of river-floodplain connectivity in influencing water, dissolved organic carbon (DOC), and nutrient flux in river networks of the Colorado Rockies. We found that disconnected segments with limited floodplain/riparian area had limited buffering capacity, while connected segments exhibited variable source-sink dynamics as a function of flow. Specifically, connected segments were typically a sink for water, DOC, and nutrients during high flows, and subsequently became a source as flows decreased. Shifts in river-floodplain hydrologic connectivity across flows related to higher and more variable aquatic ecosystem metabolism rates along connected relative to disconnected segments. Our data suggest that lateral hydrologic connectivity in wide valleys can enhance hydrologic and biogeochemical buffering, and promote high rates of aquatic ecosystem metabolism. While hydrologic disconnection in one river-floodplain system is unlikely to influence water resources at larger scales, the cumulative effects of widespread disconnection may be substantial. Because intact river-floodplain (i.e., connected) systems provide numerous

  13. Gravel-bed river floodplains are the ecological nexus of glaciated mountain landscapes

    Science.gov (United States)

    Hauer, F. Richard; Locke, Harvey; Dreitz, Victoria; Hebblewhite, Mark; Lowe, Winsor; Muhlfeld, Clint C.; Nelson, Cara; Proctor, Michael F.; Rood, Stewart B.

    2016-01-01

    Gravel-bed river floodplains in mountain landscapes disproportionately concentrate diverse habitats, nutrient cycling, productivity of biota, and species interactions. Although stream ecologists know that river channel and floodplain habitats used by aquatic organisms are maintained by hydrologic regimes that mobilize gravel-bed sediments, terrestrial ecologists have largely been unaware of the importance of floodplain structures and processes to the life requirements of a wide variety of species. We provide insight into gravel-bed rivers as the ecological nexus of glaciated mountain landscapes. We show why gravel-bed river floodplains are the primary arena where interactions take place among aquatic, avian, and terrestrial species from microbes to grizzly bears and provide essential connectivity as corridors for movement for both aquatic and terrestrial species. Paradoxically, gravel-bed river floodplains are also disproportionately unprotected where human developments are concentrated. Structural modifications to floodplains such as roads, railways, and housing and hydrologicaltering hydroelectric or water storage dams have severe impacts to floodplain habitat diversity and productivity, restrict local and regional connectivity, and reduce the resilience of both aquatic and terrestrial species, including adaptation to climate change. To be effective, conservation efforts in glaciated mountain landscapes intended to benefit the widest variety of organisms need a paradigm shift that has gravel-bed rivers and their floodplains as the central focus and that prioritizes the maintenance or restoration of the intact structure and processes of these critically important systems throughout their length and breadth.

  14. Hydrological and hydraulic modelling of the Nyl River floodplain Part ...

    African Journals Online (AJOL)

    Catchment land-use and water resource developments may threaten the ecological integrity of the Nyl River floodplain, a world-renowned conservation area. The effect of developments on the water supply regime to the floodplain can be predicted by hydrological modelling, but assessing their ecological consequences ...

  15. Application of near-surface geophysics as part of a hydrologic study of a subsurface drip irrigation system along the Powder River floodplain near Arvada, Wyoming

    Science.gov (United States)

    Sams, James I.; Veloski, Garret; Smith, Bruce D.; Minsley, Burke J.; Engle, Mark A.; Lipinski, Brian A.; Hammack, Richard W.; Zupancic, John W.

    2014-01-01

    Rapid development of coalbed natural gas (CBNG) production in the Powder River Basin (PRB) of Wyoming has occurred since 1997. National attention related to CBNG development has focused on produced water management, which is the single largest cost for on-shore domestic producers. Low-cost treatment technologies allow operators to reduce their disposal costs, provide treated water for beneficial use, and stimulate oil and gas production by small operators. Subsurface drip irrigation (SDI) systems are one potential treatment option that allows for increased CBNG production by providing a beneficial use for the produced water in farmland irrigation.Water management practices in the development of CBNG in Wyoming have been aided by integrated geophysical, geochemical, and hydrologic studies of both the disposal and utilization of water. The U.S. Department of Energy (DOE) National Energy Technology Laboratory (NETL) and the U.S. Geological Survey (USGS) have utilized multi-frequency airborne, ground, and borehole electromagnetic (EM) and ground resistivity methods to characterize the near-surface hydrogeology in areas of produced water disposal. These surveys provide near-surface EM data that can be compared with results of previous surveys to monitor changes in soils and local hydrology over time as the produced water is discharged through SDI.The focus of this investigation is the Headgate Draw SDI site, situated adjacent to the Powder River near the confluence of a major tributary, Crazy Woman Creek, in Johnson County, Wyoming. The SDI system was installed during the summer of 2008 and began operation in October of 2008. Ground, borehole, and helicopter electromagnetic (HEM) conductivity surveys were conducted at the site prior to the installation of the SDI system. After the installation of the subsurface drip irrigation system, ground EM surveys have been performed quarterly (weather permitting). The geophysical surveys map the heterogeneity of the near

  16. Radiological effects of a nuclear power plant on a river system, as demonstrated by the Gundremmingen BWR on the Danube

    International Nuclear Information System (INIS)

    Herrmann, H.; Ruf, M.; Huebel, K.; Luensmann, W.

    1975-01-01

    The Gundremmingen Nuclear Power Plant (boiling water reactor, 237 MW(e)), on the Upper Danube, has been in operation since 1967. Radiological data have been collected throughout its period of operation. The behaviour of the radioactive waste products in the ecological system of the Upper Danube (water, sediments, suspended solids, water-plants, fish) has been analysed in connection with environmental contamination, the uptake capacity of the Danube, and the possible pathways to man. As a result of the investigations, it seems possible to build further nuclear power plants on the Danube, if their rates of release of radioactivity are similar to those at Gundremmingen. (author)

  17. Spatial Patterns in Biofilm Diversity across Hierarchical Levels of River-Floodplain Landscapes.

    Directory of Open Access Journals (Sweden)

    Marc Peipoch

    Full Text Available River-floodplain systems are among the most diverse and productive ecosystems, but the effects of biophysical complexity at multiple scales on microbial biodiversity have not been studied. Here, we investigated how the hierarchical organization of river systems (i.e., region, floodplain, zone, habitats, and microhabitats influences epilithic biofilm community assemblage patterns by characterizing microbial communities using 16S rRNA gene sequence data and analyzing bacterial species distribution across local and regional scales. Results indicate that regional and local environmental filters concurrently sort bacterial species, suggesting that spatial configuration of epilithic biofilms resembles patterns of larger organisms in floodplain ecosystems. Along the hierarchical organization of fluvial systems, floodplains constitute a vector of maximum environmental heterogeneity and consequently act as a major landscape filter for biofilm species. Thus, river basins and associated floodplains may simply reflect very large scale 'patches' within which environmental conditions select for community composition of epilithic biofilms.

  18. QMRAcatch - faecal microbial quality of water resources in a river-floodplain area affected by urban sources and recreational visitors

    Science.gov (United States)

    Derx, Julia; Schijven, Jack; Sommer, Regina; Kirschner, Alexander; Farnleitner, Andreas H.; Blaschke, Alfred Paul

    2016-04-01

    QMRAcatch, a tool to simulate microbial water quality including infection risk assessment, was previously developed and successfully tested at a Danube river site (Schijven et al. 2015). In the tool concentrations of target faecal microorganisms and viruses (TMVs) are computed at a point of interest (PI) along the main river and the floodplain river at daily intervals for a one year period. Even though faecal microbial pathogen concentrations in water resources are usually below the sample limit of detection, this does not ensure, that the water quality complies with a certain required health based target. The aim of this study was therefore to improve the predictability of relevant human pathogenic viruses, i.e. enterovirus and norovirus, in the studied river/floodplain area. This was done by following an innovative calibration strategy based on human-associated microbial source tracking (MST) marker data which were determined following the HF183 TaqMan assay (Green et al. 2011). The MST marker is strongly associated with human faeces and communal sewage, occurring there in numbers by several magnitudes higher than for human enteric pathogens (Mayer et al 2015). The calibrated tool was then evaluated with measured enterovirus concentrations at the PI and in the floodplain river. In the simulation tool the discharges of 5 wastewater treatment plants (WWTPs) were considered with point discharges along a 200 km reach of the Danube river. The MST marker and target virus concentrations at the PI at a certain day were computed based on the concentrations of the previous day, plus the wastewater concentrations times the WWTP discharge divided by the river discharge. A ratio of the river width was also considered, over which the MST marker and virus particles have fully mixed with river water. In the tool, the excrements from recreational visitors frequenting the floodplain area every day were assumed to be homogeneously distributed in the area. A binomial distributed

  19. River-floodplain Hydrologic Connectivity: Impact on Temporal and Spatial Floodplain Water Quality and Productivity Patterns

    Science.gov (United States)

    Gallo, E. L.; Ahearn, D.; Dahlgren, R. A.; Grosholz, E.

    2003-12-01

    Nutrient spiraling and cycling are critical processes for floodplain systems, but these have not been well studied in western North America. Floodplain production and function relies on the integrity of river-floodplain interactions, particularly during periods of hydrologic connectivity. The purpose of this study was to: (1) determine the importance of the timing and duration of river-floodplain hydrologic connectivity, (2) link flood event water quality to subsequent primary and secondary production, and (3) identify temporal and spatial patterns of floodplain production. The Cosumnes River watershed transports surface runoff and snowmelt from the Sierra Nevadas to the Sacramento-San Joaquin Delta. It is one of the few watersheds in California that has no major water diversions or impoundments; therefore the river responds to the natural watershed hydrology. The study site in southern Sacramento County is an unmanaged experimental floodplain, one of the few remaining floodplains in California. Weekly and flood-event water quality and macroinvertebrate sampling was conducted during the flood season from January through June in 2001 and 2002. Both water years were characterized by historically low river flows. On average, volatile suspended solids in the water column increased from 5 mg/l to 10 mg/l during early season periods of hydrologic connectivity (December - February), suggesting that during watershed flushing flood events, the river acts as a source of nutrients and organic matter to the floodplain. Following a flood event, invertebrate concentrations decreased on average from 26,000 individuals/m3 to 9,000 individuals/m3 for zooplankton and from 350 individuals/m2 to 65 individuals/m2 for benthic macro-invertebrate, suggesting a net dilution of invertebrates during flood events. Chlorophyll a (chl-a) levels were also diluted during flood events, on average from 25 ppb to 5 ppb. Zooplankton densities and chl-a levels quickly rose after flood events. On

  20. Wetland tree transpiration modified by river-floodplain connectivity

    Science.gov (United States)

    Allen, Scott T.; Krauss, Ken W.; Cochran, J. Wesley; King, Sammy L.; Keim, Richard F.

    2016-01-01

    Hydrologic connectivity provisions water and nutrient subsidies to floodplain wetlands and may be particularly important in floodplains with seasonal water deficits through its effects on soil moisture. In this study, we measured sapflow in 26 trees of two dominant floodplain forest species (Celtis laevigata and Quercus lyrata) at two hydrologically distinct sites in the lower White River floodplain in Arkansas, USA. Our objective was to investigate how connectivity-driven water table variations affected water use, an indicator of tree function. Meteorological variables (photosynthetically active radiation and vapor pressure deficit) were the dominant controls over water use at both sites; however, water table variations explained some site differences. At the wetter site, highest sapflow rates were during a late-season overbank flooding event, and no flood stress was apparent. At the drier site, sapflow decreased as the water table receded. The late-season flood pulse that resulted in flooding at the wetter site did not affect the water table at the drier site; accordingly, higher water use was not observed at the drier site. The species generally associated with wetter conditions (Q. lyrata) was more positively responsive to the flood pulse. Flood water subsidy lengthened the effective growing season, demonstrating ecological implications of hydrologic connectivity for alleviating water deficits that otherwise reduce function in this humid floodplain wetland.

  1. Geochemistry of the Upper Parana River floodplain. Study of the Garcas Pond and Patos Pond

    International Nuclear Information System (INIS)

    Marcelo Bevilacqua Remor; Silvio Cesar Sampaio; Marcio Antonio Vilas Boas; Ralpho Rinaldo dos Reis

    2015-01-01

    The aim of this study was to investigate the temporal evolution of the supply of chemical elements to the Upper Parana River floodplain and identify trends in the geochemistry of its drainage basin. The primary factor that regulates the supply of chemical elements of the Upper Parana River floodplain is the flood pulse, which can be magnified by the El Nino-Southern Oscillation. Garcas Pond is affected by agriculture, urbanization, discharge of industrial effluents and hydroelectric power production activities. Patos Pond is affected by sugarcane burning, gold mining, agriculture and urbanization. (author)

  2. Geomorphology of the Trinity River floodplain in Dallas County, Texas

    Science.gov (United States)

    Haugen, B. D.; Roig-Silva, C.; Manning, A. R.; Harrelson, D. W.; Olsen, R. S.; Dunbar, J. P.; Pearson, M. L.

    2010-12-01

    Data from more than 1,800 geologic borings and over 500 cone penetrometer tests (CPTs) were used to characterize the geomorphology of the Trinity River floodplain in the Dallas Metropolitan Area. Historical maps, aerial photographs and other published information were used to prepare a preliminary geomorphic map. Boring logs and CPT data were then used to refine the preliminary map, produce a series of two-dimensional (2D) and three-dimensional (3D) cross sections, and interpret the recent geologic history of the area. Geomorphologic interpretations - most importantly the locations of paleo-channel deposits of sands and gravels - were used to identify reaches of the levees managed by the United States Army Corps of Engineers (USACE) and the City of Dallas that may be at significant risk for under-seepage. Boring logs and CPT data collected atop the levees were used to assess through-seepage risks. Local bedrock is comprised of cretaceous-age Eagle Ford Shale and Austin Chalk. Depth to bedrock in the study area averaged 14.6 m (47.8 ft). The uppermost surface of bedrock has been deeply incised by a meandering river. Vertical relief between the shallowest bedrock sections and deepest portion of the incised paleo-channel is more than 15 m (50 ft). In places the incised paleo-channel is more than 0.8 km (0.5 mi) wide. These data confirm the presence of an erosional unconformity between local bedrock and overlying quaternary floodplain deposits. The observed erosional unconformity is attributed to a higher-energy fluvial environment that occurred as a result of a drop in base level. Recent floodplain deposits consist of interlobate point bar, channel and overbank sediments that are generally distributed in a fining-upward sequence. Buried channel dimensions vary widely, but are more than 250 m (820 ft) in some areas - much larger than the current channel. A semi-continuous basal layer of quaternary sands and gravels approximately 2 to 5 m (7 to 16 ft) thick exists in

  3. Seasonal changes in caddis larvae assemblages in river-floodplain habitats along a hydrological connectivity gradient

    NARCIS (Netherlands)

    Van den Brink, F.W.B.; Van der Velde, G.; Wijnhoven, S.

    2013-01-01

    In order to assess the impact of seasonality versus connectivity on the ecological quality of the Lower Rhine river-floodplain habitats, we studied the seasonal variation in diversity and species assemblages of caddis larvae by monthly sampling of the littoral zone of four water bodies over a

  4. Distribution of soil saprophagous macrofauna along a zonal gradient in the Biebrza River floodplain (Poland)

    Czech Academy of Sciences Publication Activity Database

    Wytwer, J.; Pižl, Václav; Sterzyńska, M.; Tajovský, Karel

    2010-01-01

    Roč. 74, - (2010), s. 169-179 ISSN 1211-376X. [Central European Workshop on Soil Zoology /10./. České Budějovice, 21.04.2009-24.04.2009] Institutional research plan: CEZ:AV0Z60660521 Keywords : wetlands * river floodplain * soil fauna Subject RIV: EH - Ecology, Behaviour

  5. Multi-criteria decision support for the revitalisation of river floodplains

    NARCIS (Netherlands)

    Zsuffa, I.J.

    2001-01-01

    Ecological revitalisation of river floodplains has become a very actual issue worldwide. It has been recognised that floodplains have the potential to become ecologically very productive areas inhabited by many valuable and rare species. Floodplains also play an important role in regional

  6. Hydrologic and hydraulic modelling of the Nyl River floodplain Part 3 ...

    African Journals Online (AJOL)

    The ecological functioning of the Nyl River floodplain in the Limpopo Province of South Africa depends on water supplied by catchments which are experiencing continuing water resource development. Hydrological and hydraulic models have been produced to assist in future planning by simulating the effects of ...

  7. Water quality of Danube Delta systems: ecological status and prediction using machine-learning algorithms.

    Science.gov (United States)

    Stoica, C; Camejo, J; Banciu, A; Nita-Lazar, M; Paun, I; Cristofor, S; Pacheco, O R; Guevara, M

    2016-01-01

    Environmental issues have a worldwide impact on water bodies, including the Danube Delta, the largest European wetland. The Water Framework Directive (2000/60/EC) implementation operates toward solving environmental issues from European and national level. As a consequence, the water quality and the biocenosis structure was altered, especially the composition of the macro invertebrate community which is closely related to habitat and substrate heterogeneity. This study aims to assess the ecological status of Southern Branch of the Danube Delta, Saint Gheorghe, using benthic fauna and a computational method as an alternative for monitoring the water quality in real time. The analysis of spatial and temporal variability of unicriterial and multicriterial indices were used to assess the current status of aquatic systems. In addition, chemical status was characterized. Coliform bacteria and several chemical parameters were used to feed machine-learning (ML) algorithms to simulate a real-time classification method. Overall, the assessment of the water bodies indicated a moderate ecological status based on the biological quality elements or a good ecological status based on chemical and ML algorithms criteria.

  8. Shifts in river-floodplain relationship reveal the impacts of river regulation: A case study of Dongting Lake in China

    Science.gov (United States)

    Lu, Cai; Jia, Yifei; Jing, Lei; Zeng, Qing; Lei, Jialin; Zhang, Shuanghu; Lei, Guangchun; Wen, Li

    2018-04-01

    Better understanding of the dynamics of hydrological connectivity between river and floodplain is essential for the ecological integrity of river systems. In this study, we proposed a regime-switch modelling (RSM) framework, which integrates change point analysis with dynamic linear regression, to detect and date change points in linear regression, and to quantify the relative importance of natural variations and anthropogenic disturbances. The approach was applied to the long-term hydrological time series to investigate the evolution of river-floodplain relation in Dongting Lake in the last five decades, during which the Yangtze River system experienced unprecedented anthropogenic manipulations. Our results suggested that 1) there were five distinct regimes during which the influence of inflows and local climate on lake water level changed significantly. The detected change points were well corresponding to the major events occurred upon the Yangtze; 2) although the importance of inflows from the Yangtze was greater than that of the tributaries flows over the five regimes, the relative contribution gradually decreased from regime 1 to regime 5. The weakening of hydrological forcing from the Yangtze was mainly attributed to the reduction in channel capacity resulting from sedimentation in the outfalls and water level dropping caused by river bed scour in the mainstream; 3) the effects of local climate was much smaller than these of inflows; and 4) since the operation of The Three Gorges Dam in 2006, the river-floodplain relationship entered a new equilibrium in that all investigated variables changed synchronously in terms of direction and magnitude. The results from this study reveal the mechanisms underlying the alternated inundation regime in Dongting Lake. The identified change points, some of which have not been previously reported, will allow a reappraisal of the current dam and reservoir operation strategies not only for flood/drought risk management but

  9. Pb isotope evidence for contaminant-metal dispersal in an international river system: The lower Danube catchment, Eastern Europe

    International Nuclear Information System (INIS)

    Bird, Graham; Brewer, Paul A.; Macklin, Mark G.; Nikolova, Mariyana; Kotsev, Tsvetan; Mollov, Mihail; Swain, Catherine

    2010-01-01

    Lead isotope signatures ( 207 Pb/ 206 Pb, 208 Pb/ 206 Pb, 208 Pb/ 204 Pb, 206 Pb/ 204 Pb), determined by magnetic sector ICP-MS in river channel sediment, metal ores and mine waste, have been used as geochemical tracers to quantify the delivery and dispersal of sediment-associated metals in the lower Danube River catchment. Due to a diverse geology and range of ore-body ages, Pb isotope signatures in ore-bodies within the lower Danube River catchment show considerable variation, even within individual metallogenic zones. It is also possible to discriminate between the Pb isotopic signatures in mine waste and river sediment within river systems draining individual ore bodies. Lead isotopic data, along with multi-element data; were used to establish the provenance of river sediments and quantify sedimentary contributions to mining-affected tributaries and to the Danube River. Data indicate that mining-affected tributaries in Serbia and Bulgaria contribute up to 30% of the river channel sediment load of the lower Danube River. Quantifying relative sediment contributions from mining-affected tributaries enables spatial patterns in sediment-associated metal and As concentrations to be interpreted in terms of key contaminant sources. Combining geochemical survey data with that regarding the provenance of contaminated sediments can therefore be used to identify foci for remediation and environmental management strategies.

  10. Spatial patterns of aquatic habitat richness in the Upper Mississippi River floodplain, USA

    Science.gov (United States)

    De Jager, Nathan R.; Rohweder, Jason J.

    2012-01-01

    Interactions among hydrology and geomorphology create shifting mosaics of aquatic habitat patches in large river floodplains (e.g., main and side channels, floodplain lakes, and shallow backwater areas) and the connectivity among these habitat patches underpins high levels of biotic diversity and productivity. However, the diversity and connectivity among the habitats of most floodplain rivers have been negatively impacted by hydrologic and structural modifications that support commercial navigation and control flooding. We therefore tested the hypothesis that the rate of increase in patch richness (# of types) with increasing scale reflects anthropogenic modifications to habitat diversity and connectivity in a large floodplain river, the Upper Mississippi River (UMR). To do this, we calculated the number of aquatic habitat patch types within neighborhoods surrounding each of the ≈19 million 5-m aquatic pixels of the UMR for multiple neighborhood sizes (1–100 ha). For all of the 87 river-reach focal areas we examined, changes in habitat richness (R) with increasing neighborhood length (L, # pixels) were characterized by a fractal-like power function R = Lz (R2 > 0.92 (P z) measures the rate of increase in habitat richness with neighborhood size and is related to a fractal dimension. Variation in z reflected fundamental changes to spatial patterns of aquatic habitat richness in this river system. With only a few exceptions, z exceeded the river-wide average of 0.18 in focal areas where side channels, contiguous floodplain lakes, and contiguous shallow-water areas exceeded 5%, 5%, and 10% of the floodplain respectively. In contrast, z was always less than 0.18 for focal areas where impounded water exceeded 40% of floodplain area. Our results suggest that rehabilitation efforts that target areas with <5% of the floodplain in side channels, <5% in floodplain lakes, and/or <10% in shallow-water areas could improve habitat diversity across multiple scales in the UMR.

  11. Effects of Large Wood on River-Floodplain Connectivity in a Headwater Appalachian Stream

    Science.gov (United States)

    Keys, T.; Govenor, H.; Jones, C. N.; Hession, W. C.; Scott, D.; Hester, E. T.

    2017-12-01

    Large wood (LW) plays an important, yet often undervalued role in stream ecosystems. Traditionally, LW has been removed from streams for aesthetic, navigational, and flood mitigation purposes. However, extensive research over the last three decades has directly linked LW to critical ecosystem functions including habitat provisioning, stream geomorphic stability, and water quality improvements; and as such, LW has increasingly been implemented in stream restoration activities. One of the proposed benefits to this restoration approach is that LW increases river-floodplain connectivity, potentially decreasing downstream flood peaks and improving water quality. Here, we conducted two experiential floods (i.e., one with and one without LW) in a headwater, agricultural stream to explore the effect of LW on river-floodplain connectivity and resulting hydrodynamic processes. During each flood, we released an equal amount of water to the stream channel, measured stream discharge at upstream and downstream boundaries, and measured inundation depth at multiple locations across the floodplain. We then utilized a 2-dimensional hydrodynamic model (HEC-RAS) to simulate floodplain hydrodynamics. We first calibrated the model using observations from the two experimental floods. Then, we utilized the calibrated model to evaluate differing LW placement strategies and effects under various flow conditions. Results show that the addition of LW to the channel decreased channel velocity and increased inundation extent, inundation depth, and floodplain velocity. Differential placement of LW along the stream impacted the levels of floodplain discharge, primarily due to the geomorphic characteristics of the stream. Finally, we examined the effects of LW on floodplain hydrodynamics across a synthetic flow record, and found that the magnitude of river-floodplain connectivity decreased as recurrence interval increased, with limited impacts on storm events with a recurrence interval of 25 years

  12. SEAWARD DRIFT OF THE PONTIC SHAD LARVAE (ALOSA PONTICA) AND THE INFLUENCE OF DANUBE RIVER HYDROLOGY ON THEIR TRAVEL PATH THROUGH THE DANUBE DELTA SYSTEM.

    OpenAIRE

    NAVODARU I.

    2001-01-01

    The Pontic shad lives in the northwestern part of the Black Sea. It migrates in the Danube River for spawning. The larvae drift passively towards the sea when they reach the life stage ranging from pre-larvae to post-larvae. During the larval stage the Pontic shad is floating, mainly in the 0-50 cm upper layer of river. Upstream of the Danube Delta, in the straight sector of the river, alosids are distributed mostly towards the middle of the river, where the water velocity is higher. In the c...

  13. Kootenai River Floodplain Ecosystem Operational Loss Assessment, Protection, Mitigation and Rehabilitation, 2007-2008 Annual Report.

    Energy Technology Data Exchange (ETDEWEB)

    Merz, Norm [Kootenai Tribe of Idaho

    2009-02-18

    The overarching goals of the 'Kootenai River Floodplain Ecosystem Operational Loss Assessment, Protection, Mitigation and Rehabilitation' Project (BPA Project No.2002-011-00) are to: (1) assess abiotic and biotic factors (i.e., geomorphologic, hydrological, aquatic and riparian/floodplain communities) in determining a definitive composition of ecological integrity, (2) develop strategies to assess and mitigate losses of ecosystem functions, and (3) produce a regional operational loss assessment framework. To produce a scientifically defensible, repeatable, and complete assessment tool, KTOI assembled a team of top scientists in the fields of hydrology, hydraulics, ornithology, entomology, statistics, and river ecology, among other expertise. This advisory team is known as the Research Design and Review Team (RDRT). The RDRT scientists drive the review, selection, and adaptive management of the research designs to evaluate the ecologic functions lost due to the operation of federal hydropower facilities. The unique nature of this project (scientific team, newest/best science, adaptive management, assessment of ecological functions, etc.) has been to work in a dynamic RDRT process. In addition to being multidisciplinary, this model KTOI project provides a stark contrast to the sometimes inflexible process (review, re-review, budgets, etc.) of the Columbia River Basin Fish and Wildlife Program. The project RDRT is assembled annually, with subgroups meeting as needed throughout the year to address project issues, analyses, review, and interpretation. Activities of RDRT coordinated and directed the selection of research and assessment methodologies appropriate for the Kootenai River Watershed and potential for regional application in the Columbia River Basin. The entire RDRT continues to meet annually to update and discuss project progress. RDRT Subcontractors work in smaller groups throughout the year to meet project objectives. Determining the extent to

  14. A New Hydrogeological Research Site in the Willamette River Floodplain

    Science.gov (United States)

    The Willamette River is a ninth-order tributary of the Columbia which passes through a productive and populous region in northwest Oregon. Where unconstrained by shoreline revetments, the floodplain of this river is a high-energy, dynamic system which supports a variety of ripari...

  15. Aerial radiological survey of the Savannah River floodplain. Date of survey: July-October 1983

    International Nuclear Information System (INIS)

    Boyns, P.K.

    1984-12-01

    An aerial radiological survey of the Savannah River floodplain was conducted from late July through early October 1983 by EG and G Energy Measurements, Inc. for the United States Department of Energy, Office of Nuclear Safety, and E.I. Du Pont de Nemours and Company, Inc., Savannah River Plant. The survey consisted of airborne measurements of both natural and man-made gamma radiation emanating from the terrestrial surface. These measurements allowed an estimate of the distribution of isotopic concentrations in the floodplain area. Results are reported as isopleths superimposed on maps and aerial photographs of the area. Gamma ray energy spectra are also presented for the net man-made radionuclides. The survey was designed to cover all the Savannah River floodplain (over 8000 flight line miles) from Augusta to Savannah, Georgia. Several areas of man-made activity were detected in the vicinity of the Savannah River Plant (SRP). The presence of 60 Co was not detected below the Lower Three Runs Creek area. The 137 Cs activity decreased rapidly below Lower Three Runs Creek; at a distance of 15 kilometers (9 miles) the annual dose due to 137 Cs was less than 10 millirem (mrem). Typical backgrounds in the survey areas were between 65 and 125 mrem per year. 4 references, 51 figures, 8 tables

  16. SEAWARD DRIFT OF THE PONTIC SHAD LARVAE (ALOSA PONTICA AND THE INFLUENCE OF DANUBE RIVER HYDROLOGY ON THEIR TRAVEL PATH THROUGH THE DANUBE DELTA SYSTEM.

    Directory of Open Access Journals (Sweden)

    NAVODARU I.

    2001-07-01

    Full Text Available The Pontic shad lives in the northwestern part of the Black Sea. It migrates in the Danube River for spawning. The larvae drift passively towards the sea when they reach the life stage ranging from pre-larvae to post-larvae. During the larval stage the Pontic shad is floating, mainly in the 0-50 cm upper layer of river. Upstream of the Danube Delta, in the straight sector of the river, alosids are distributed mostly towards the middle of the river, where the water velocity is higher. In the curved section of the river, upstream of the location of the Danube River splitting in the delta’s branches, the water current is outwardly pushing the shad larvae to the right shore, the Romanian, respectively. Therefore, Tulcea branch (Romanian takes over 60-80 % from the total of Danubian larvae, even its water flow is smaller (40 % than Chilia branch (the border of Romania and Ukraine. The distribution of larvae at the splitting point influences the repartition of adult migratory catch, at return for spawning, between Saint George branch (Romania and Chilia branch. Consequently, the topography and hydrology of the river at the splitting point of the branceh which form the delta decide on the distribution of larvae, and later, when the shads are homing on the same way for spawning the sharing catch between Romania and Ukraine.

  17. Property rights, institutional regime shifts and the provision of freshwater ecosystem services on the Pongola River floodplain, South Africa

    Directory of Open Access Journals (Sweden)

    Bimo Abraham Nkhata

    2017-03-01

    Full Text Available This paper proposes a property rights perspective to interpret institutional regime shifts in the provision of freshwater ecosystem services. Institutional regime shifts are conceived as persistent changes in the structure and function of a system. Property rights are viewed as an important component of institutional regimes. The paper draws on a case study of flow regulation on the Pongolo Floodplain in South Africa to illustrate the central role of property rights in mediating institutional regime shifts. The case study illustrates that there are many combinations of property rights that underpin institutional regime shifts in the provision of freshwater ecosystem services. It provides useful insights into the consequences of failing to recognize, establish and enforce bundles of rights. A major thrust of the case study is that the nature and context of property rights are important in determining the long-term provision of these services. By examining the configurations of property rights that have governed the Pongola River floodplain over the years, the paper demonstrates the importance of explicitly defining and categorizing the range of rights.

  18. Linking vegetation pattern to hydrology and hydrochemistry in a montane river floodplain, the Šumava National Park, Central Europe

    Czech Academy of Sciences Publication Activity Database

    Bufková, I.; Prach, Karel

    2006-01-01

    Roč. 14, - (2006), s. 317-327 ISSN 0923-4861 R&D Projects: GA ČR GA526/00/1442 Institutional research plan: CEZ:AV0Z60050516 Keywords : diversity * river floodplain * vegetation Subject RIV: EF - Botanics

  19. Field effects of pollutants in dynamic environments; a case study on earthworm populations in river floodplains contaminated with heavy metals

    NARCIS (Netherlands)

    Klok, C.; Goedhart, P.W.; Vandecasteele, B.

    2007-01-01

    In industrialized countries river floodplains can be strongly polluted with heavy metals. Published studies on effects of heavy metal pollution on soil invertebrates in floodplains, however, are inconclusive. This is unexpected since studies in other less dynamic environments reported clear effects

  20. Restoration of hard mast species for wildlife in Missouri using precocious flowering oak in the Missouri River floodplain, USA

    Science.gov (United States)

    B. C. Grossman; M. A. Gold; Daniel C. Dey

    2003-01-01

    Increased planting of hard mast oak species in the Lower Missouri River floodplain is critical as natural regeneration of oak along the Upper Mississippi and Lower Missouri Rivers has been limited following major flood events in 1993 and 1995. Traditional planting methods have limited success due to frequent flood events, competition from faster growing vegetation and...

  1. Using ²¹⁰Pb measurements to estimate sedimentation rates on river floodplains.

    Science.gov (United States)

    Du, P; Walling, D E

    2012-01-01

    Growing interest in the dynamics of floodplain evolution and the important role of overbank sedimentation on river floodplains as a sediment sink has focused attention on the need to document contemporary and recent rates of overbank sedimentation. The potential for using the fallout radionuclides ¹³⁷Cs and excess ²¹⁰Pb to estimate medium-term (10-10² years) sedimentation rates on river floodplains has attracted increasing attention. Most studies that have successfully used fallout radionuclides for this purpose have focused on the use of ¹³⁷Cs. However, the use of excess ²¹⁰Pb potentially offers a number of advantages over ¹³⁷Cs measurements. Most existing investigations that have used excess ²¹⁰Pb measurements to document sedimentation rates have, however, focused on lakes rather than floodplains and the transfer of the approach, and particularly the models used to estimate the sedimentation rate, to river floodplains involves a number of uncertainties, which require further attention. This contribution reports the results of an investigation of overbank sedimentation rates on the floodplains of several UK rivers. Sediment cores were collected from seven floodplain sites representative of different environmental conditions and located in different areas of England and Wales. Measurements of excess ²¹⁰Pb and ¹³⁷Cs were made on these cores. The ²¹⁰Pb measurements have been used to estimate sedimentation rates and the results obtained by using different models have been compared. The ¹³⁷Cs measurements have also been used to provide an essentially independent time marker for validation purposes. In using the ²¹⁰Pb measurements, particular attention was directed to the problem of obtaining reliable estimates of the supported and excess or unsupported components of the total ²¹⁰Pb activity of sediment samples. Although there was a reasonable degree of consistency between the estimates of sedimentation rate provided by

  2. Using 210Pb measurements to estimate sedimentation rates on river floodplains

    International Nuclear Information System (INIS)

    Du, P.; Walling, D.E.

    2012-01-01

    Growing interest in the dynamics of floodplain evolution and the important role of overbank sedimentation on river floodplains as a sediment sink has focused attention on the need to document contemporary and recent rates of overbank sedimentation. The potential for using the fallout radionuclides 137 Cs and excess 210 Pb to estimate medium-term (10–10 2 years) sedimentation rates on river floodplains has attracted increasing attention. Most studies that have successfully used fallout radionuclides for this purpose have focused on the use of 137 Cs. However, the use of excess 210 Pb potentially offers a number of advantages over 137 Cs measurements. Most existing investigations that have used excess 210 Pb measurements to document sedimentation rates have, however, focused on lakes rather than floodplains and the transfer of the approach, and particularly the models used to estimate the sedimentation rate, to river floodplains involves a number of uncertainties, which require further attention. This contribution reports the results of an investigation of overbank sedimentation rates on the floodplains of several UK rivers. Sediment cores were collected from seven floodplain sites representative of different environmental conditions and located in different areas of England and Wales. Measurements of excess 210 Pb and 137 Cs were made on these cores. The 210 Pb measurements have been used to estimate sedimentation rates and the results obtained by using different models have been compared. The 137 Cs measurements have also been used to provide an essentially independent time marker for validation purposes. In using the 210 Pb measurements, particular attention was directed to the problem of obtaining reliable estimates of the supported and excess or unsupported components of the total 210 Pb activity of sediment samples. Although there was a reasonable degree of consistency between the estimates of sedimentation rate provided by the 137 Cs and excess 210 Pb

  3. Cyclopidae (Crustacea, Copepoda) from the upper Paraná River floodplain, Brazil.

    Science.gov (United States)

    Lansac-Tôha, F A; Velho, L F M; Higuti, J; Takahashi, E M

    2002-02-01

    Cyclopid copepods from samples of fauna associated with aquatic macrophytes and plancton obtained in lotic and lentic environments were obtained from the upper Paraná River floodplain (in the states of Paraná and Mato Grosso do Sul, Brazil). Macrophytes were collected in homogeneous stands and washed. Plankton samples, taken from the water column surface and bottom, were obtained using a motor pump, with a 70 microns mesh plankton net for filtration. Twelve taxa of Cyclopidae were identified. Among them, Macrocyclops albidus albidus, Paracyclops chiltoni, Ectocyclops rubescens, Homocyclops ater, Eucyclops solitarius, Mesocyclops longisetus curvatus, Mesocyclops ogunnus, and Microcyclops finitimus were new finds for this floodplain. Eight species were recorded exclusively in aquatic macrophyte samples. Among these species, M. albidus albidus and M. finitimus presented greatest abundances. Only four species were recorded in plankton samples, and Thermocyclops minutus and Thermocyclops decipiens are limited to this type of habitat. Among these four species, T. minutus is the most abundant, especially in lentic habitats.

  4. Determination of inundation area in the Amazon River floodplain using the SMMR 37 GHz polarization difference

    International Nuclear Information System (INIS)

    Sippel, S.J.; Hamilton, S.K.; Melack, J.M.; Choudhury, B.J.

    1994-01-01

    The 37 GHz polarization difference observed by the Scanning Multichannel Microwave Radiometer (SMMR), which was operated on board the Nimbus-7 satellite, provides a sensitive indicator of surface water. These data can provide information on seasonal inundation patterns in large tropical wetlands such as the Amazon River floodplain. Although the SMMR data are of low resolution, we were able to estimate the area inundated within a group of pixels by using linear mixing models which incorporate the major end-members of the observed microwave signatures. The models were then used to estimate seasonal changes in inundation area over a 7-year period for a 34,550 km 2 area along the Amazon River near Manaus. The seasonal changes in inundation area determined using mixing models correlate well with changes in river stage. (author)

  5. Absolute water storages in the Congo River floodplains from integration of InSAR and satellite radar altimetry

    Science.gov (United States)

    Lee, H.; Yuan, T.; Jung, H. C.; Aierken, A.; Beighley, E.; Alsdorf, D. E.; Tshimanga, R.; Kim, D.

    2017-12-01

    Floodplains delay the transport of water, dissolved matter and sediments by storing water during flood peak seasons. Estimation of water storage over the floodplains is essential to understand the water balances in the fluvial systems and the role of floodplains in nutrient and sediment transport. However, spatio-temporal variations of water storages over floodplains are not well known due to their remoteness, vastness, and high temporal variability. In this study, we propose a new method to estimate absolute water storages over the floodplains by establishing relations between water depths (d) and water volumes (V) using 2-D water depth maps from the integration of Interferometric Synthetic Aperture Radar (InSAR) and altimetry measurements. We applied this method over the Congo River floodplains and modeled the d-V relation using a power function (note that d-V indicates relation between d and V, not d minus V), which revealed the cross-section geometry of the floodplains as a convex curve. Then, we combined this relation and Envisat altimetry measurements to construct time series of floodplain's absolute water storages from 2002 to 2011. Its mean annual amplitude over the floodplains ( 7,777 km2) is 3.860.59 km3 with peaks in December, which lags behind total water storage (TWS) changes from the Gravity Recovery and Climate Experiment (GRACE) and precipitation changes from Tropical Rainfall Measuring Mission (TRMM) by about one month. The results also exhibit inter-annual variability, with maximum water volume to be 5.9 +- 0.72 km3 in the wet year of 2002 and minimum volume to be 2.01 +- 0.63 km3 in the dry year of 2005. The inter-annual variation of water storages can be explained by the changes of precipitation from TRMM.

  6. Managing the Mississippi River floodplain: Achieving ecological benefits requires more than hydrological connection to the river: Chapter

    Science.gov (United States)

    Schramm, Harold; Richardson, William B.; Knights, Brent C.

    2015-01-01

    Floodplains are vital to the structure and function of river-floodplain ecosystems. Among the many ecological services provided by floodplains are nutrient cycling and seasonal habitats for fish, including spawning, nursery, foraging and wintering habitats. Connections between the river channel and floodplain habitats are essential to realize these ecological services, but spatial and temporal aspects of the connection and contemporary geomorphology must also be considered in restoration efforts. This chapter synthesizes available information to compare floodplain function and needed management strategies in two extensive reaches (upper impounded and lower free-flowing) of the Mississippi River, USA. The upper impounded reach is the 523-km reach from about Minneapolis, Minnesota to Clinton, Iowa. This reach has been impounded and channelized for navigation. Mean annual water-level fluctuation ranges from 1 to 2 m in the navigation pools in this reach. Floodplain environmental conditions that affect nitrogen cycling and fish production vary seasonally and longitudinally within and among navigation pools. Significant issues affecting ecological services include sedimentation, constrained water level fluctuations, island erosion and seasonal hypoxia. The lower free-flowing reach, the 1570-km reach from the confluence of the Ohio and Mississippi rivers to the Gulf of Mexico, has no dams and average annual fluctuations of 7 m throughout most of the reach. Despite the substantial flood pulse, floodplain inundation is often brief and may not occur annually. Significant issues affecting floodplain ecological function are the short duration and thermal asynchrony of the flood pulse, sedimentation and loss of connection between the river channel and permanent/semi-permanent floodplain water bodies due to channel incision. Needs and strategies for floodplain enhancement to increase ecological services, particularly nitrogen cycling and fish production, differ along the

  7. Field effects of pollutants in dynamic environments. A case study on earthworm populations in river floodplains contaminated with heavy metals

    International Nuclear Information System (INIS)

    Klok, Chris; Goedhart, Paul W.; Vandecasteele, Bart

    2007-01-01

    In industrialized countries river floodplains can be strongly polluted with heavy metals. Published studies on effects of heavy metal pollution on soil invertebrates in floodplains, however, are inconclusive. This is unexpected since studies in other less dynamic environments reported clear effects at even lower levels of pollution. Flooding induces extra variation in invertebrate biomass and abundance which may reduce the probability to detect heavy metal effects. In this paper we combine reported data from studies on river floodplains in The Netherlands and Belgium and statistically analyze the effect of heavy metals on species composition, biomass, density and individual weight of earthworms. Interaction effects of heavy metal stress and flooding are also considered. The results suggest clear effects of zinc and copper on all variables and interaction of heavy metals and flooding for individual weight. - Interaction with flooding masks heavy metal effects

  8. Flower morphology, nectar features, and hummingbird visitation to Palicourea crocea (Rubiaceae) in the Upper Paraná River floodplain, Brazil

    OpenAIRE

    Mendonça, Luciana B.; Anjos, Luiz dos

    2006-01-01

    We investigated flower morphology, nectar features, and hummingbird visitation to Palicourea crocea (Rubiaceae), a common ornithophilous shrub found in the riparian forest understory in the Upper Paraná River floodplain, Brazil. Flowers are distylous and the style-stamen dimorphism is accompanied by other intermorph dimorphisms in corolla length, anther length, and stigma lobe length and form. We did not observe strict reciprocity in the positioning of stigma and anthers between floral morphs...

  9. River Floodplains as Habitat and Bio-Corridors for Distribution of Land Snails: Their Past and Present

    Directory of Open Access Journals (Sweden)

    Horáčková Jitka

    2015-12-01

    Full Text Available River floodplains of Czech rivers serve as refugia to woodland or hydrophilous gastropods, in current intensively agriculturally utilised, urbanised and largely fragmented landscape. This habitat often form one of the last refuge and replace the natural habitat of these species. River floodplains also represent linear bio-corridors in landscape and allow gastropods to spread through the landscape in both directions, up and down the stream. We showed based on available fossil mollusc successions that development of the floodplain mollusc fauna took place quite different way in various river floodplains, depending on their specifics and geographical location, because especially the ones situated in the chernozem area of the Czech Republic had very different history in comparison with those in higher altitudes. The species richness and composition of recent floodplain malacofauna arises from historical development of particular area/site and depends also on environmental factors such as an elevation, humidity gradient, vegetation type and its biomass, light conditions of the site and soil reaction. Recently, the invasive plants represent a serious problem for current floodplain ecosystems; species richness and abundances of terrestrial mollusc floodplain assemblages are changing due to their effect. The impact on gastropods is species-specific and was described for the following species: Impatiens glandulifera, Fallopia japonica subsp. japonica, F. sachalinensis, F. ×bohemica.

  10. Use of seasonal freshwater wetlands by fishes in a temperate river floodplain

    Science.gov (United States)

    Henning, Julie A.; Gresswell, Robert E.; Fleming, Ian A.

    2007-01-01

    This study examined the use of freshwater wetland restoration and enhancement projects (i.e. non-estuarine wetlands subject to seasonal drying) by fish populations. To quantify fish use of freshwater emergent wetlands and assess the effect of wetland enhancement (i.e. addition of water control structures), two enhanced and two unenhanced emergent wetlands were compared, as well as two oxbow habitats within the Chehalis River floodplain. Eighteen fish species were captured using fyke nets and emigrant traps from January to the beginning of June, with the most abundant being three-spined stickleback Gasterosteus aculeatus and Olympic mudminnow Novumbra hubbsi. Coho salmon Oncorhynchus kisutch was the dominant salmonid at all sites. Enhanced wetlands, with their extended hydroperiods, had significantly higher abundances of yearling coho salmon than unenhanced wetlands. Both enhanced and unenhanced emergent wetlands yielded higher abundances of non-game native fishes than oxbow habitats. Oxbow habitats, however, were dominated by coho salmon. Fish survival in the wetland habitats was dependent on emigration to the river before dissolved oxygen concentrations decreased and wetlands became isolated and stranding occurred. This study suggests that wetland enhancement projects with an outlet to the river channel appear to provide fishes with important temporary habitats if they have the opportunity to leave the wetland as dissolved oxygen levels deteriorate.

  11. Cyclopidae (Crustacea, Copepoda from the upper Paraná River floodplain, Brazil

    Directory of Open Access Journals (Sweden)

    F. A. LANSAC-TÔHA

    Full Text Available Cyclopid copepods from samples of fauna associated with aquatic macrophytes and plancton obtained in lotic and lentic environments were obtained from the upper Paraná River floodplain (in the states of Paraná and Mato Grosso do Sul, Brazil. Macrophytes were collected in homogeneous stands and washed. Plankton samples, taken from the water column surface and bottom, were obtained using a motor pump, with a 70 mum mesh plankton net for filtration. Twelve taxa of Cyclopidae were identified. Among them, Macrocyclops albidus albidus, Paracyclops chiltoni, Ectocyclops rubescens, Homocyclops ater, Eucyclops solitarius, Mesocyclops longisetus curvatus, Mesocyclops ogunnus, and Microcyclops finitimus were new finds for this floodplain. Eight species were recorded exclusively in aquatic macrophyte samples. Among these species, M. albidus albidus and M. finitimus presented greatest abundances. Only four species were recorded in plankton samples, and Thermocyclops minutus and Thermocyclops decipiens are limited to this type of habitat. Among these four species, T. minutus is the most abundant, especially in lentic habitats.

  12. Cyclopidae (Crustacea, Copepoda from the upper Paraná River floodplain, Brazil

    Directory of Open Access Journals (Sweden)

    LANSAC-TÔHA F. A.

    2002-01-01

    Full Text Available Cyclopid copepods from samples of fauna associated with aquatic macrophytes and plancton obtained in lotic and lentic environments were obtained from the upper Paraná River floodplain (in the states of Paraná and Mato Grosso do Sul, Brazil. Macrophytes were collected in homogeneous stands and washed. Plankton samples, taken from the water column surface and bottom, were obtained using a motor pump, with a 70 mum mesh plankton net for filtration. Twelve taxa of Cyclopidae were identified. Among them, Macrocyclops albidus albidus, Paracyclops chiltoni, Ectocyclops rubescens, Homocyclops ater, Eucyclops solitarius, Mesocyclops longisetus curvatus, Mesocyclops ogunnus, and Microcyclops finitimus were new finds for this floodplain. Eight species were recorded exclusively in aquatic macrophyte samples. Among these species, M. albidus albidus and M. finitimus presented greatest abundances. Only four species were recorded in plankton samples, and Thermocyclops minutus and Thermocyclops decipiens are limited to this type of habitat. Among these four species, T. minutus is the most abundant, especially in lentic habitats.

  13. Metals and arsenic in soils and corresponding vegetation at Central Elbe river floodplains (Germany)

    Energy Technology Data Exchange (ETDEWEB)

    Overesch, M. [Department for Geo- and Agroecology, Institute of Spatial Analysis and Planning in Areas of Intensive Agriculture, University of Vechta, P.O. Box 1553, D-49364 Vechta (Germany)]. E-mail: moveresch@ispa.uni-vechta.de; Rinklebe, J. [Department of Soil Science, UFZ Center for Environmental Research Leipzig-Halle, Theodor-Lieser-Strasse 4, D-06120 Halle (Germany)]. E-mail: joerg.rinklebe@ufz.de; Broll, G. [Department for Geo- and Agroecology, Institute of Spatial Analysis and Planning in Areas of Intensive Agriculture, University of Vechta, P.O. Box 1553, D-49364 Vechta (Germany)]. E-mail: gbroll@ispa.uni-vechta.de; Neue, H.-U. [Department of Soil Science, UFZ Center for Environmental Research Leipzig-Halle, Theodor-Lieser-Strasse 4, D-06120 Halle (Germany)]. E-mail: heinz-ulrich.neue@ufz.de

    2007-02-15

    Floodplain soils at the Elbe river are frequently polluted with metals and arsenic. High contents of these pollutants were detected down to subsoil layers. NH{sub 4}NO{sub 3}-extractable (phytoavailable) Cd, Ni, and Zn were elevated in horizons with high acidity. Among five common floodplain plant species, Artemisia vulgaris showed highest concentrations of Cd, Cu, and Hg, Alopecurus pratensis of As and Phalaris arundinacea of Ni, Pb, and Zn. Relationships were weak between metal concentrations in plants and phytoavailable stocks in soil. As and Hg uptake seems to be enhanced on long submerged soils. Enrichments of Cd and Hg are linked to a special plant community composition. Grassland herbage sampled in July/August revealed higher concentrations of As (+122%), Hg (+124%), and Pb (+3723%) than in May. To limit harmful transfers into the food chain, low-lying terraces and flood channels revealing highest contaminations or phytoavailabilities should be excluded from mowing and grazing. - Soils in the Elbe river floodplains are highly polluted with metals and arsenic and a critical enrichment in the grassland herbage seems to be most likely in flood channels or within special plant species.

  14. Plant communities in relation to flooding and soil contamination in a lowland Rhine River floodplain

    International Nuclear Information System (INIS)

    Schipper, Aafke M.; Lotterman, Kim; Leuven, Rob S.E.W.; Ragas, Ad M.J.; Kroon, Hans de; Hendriks, A. Jan

    2011-01-01

    Using canonical correspondence analysis (CCA), relationships were investigated between plant species composition and flooding characteristics, heavy metal contamination and soil properties in a lowland floodplain of the Rhine River. Floodplain elevation and yearly average flooding duration turned out to be more important for explaining variation in plant species composition than soil heavy metal contamination. Nevertheless, plant species richness and diversity showed a significant decrease with the level of contamination. As single heavy metal concentrations seemed mostly too low for causing phytotoxic effects in plants, this trend is possibly explained by additive effects of multiple contaminants or by the concomitant influences of contamination and non-chemical stressors like flooding. These results suggest that impacts of soil contamination on plants in floodplains could be larger than expected from mere soil concentrations. In general, these findings emphasize the relevance of analyzing effects of toxic substances in concert with the effects of other relevant stressors. - Multiple contaminants and periodic flooding may pose cumulative stress to plants in lowland floodplains.

  15. Present activities of the Danube environmental Programme

    International Nuclear Information System (INIS)

    Botterweg, T.; Turcan, J.

    1997-01-01

    The international character of the Danube river basin reflects among other aspects also the importance and the need of international co-operation at various levels. The response of this need has been expressed by the formation of different international commissions and organisations in the basin, covering mainly technical but in the recent time also the environmental interests of the riparian states. The Danube countries, several G-24 governments, as well as international and non governmental organisations decided in the autumn of 1991 to start the Environmental Programme for the Danube River Basin (EPDRB) and form the Danube Task Force. A joint Programme work plan was agreed by the Task Force in February 1992, thereby launching a series of priority projects designed to built environmental co-operation among the Danube countries. The main objective was to establish an operational basis for strategic and integrated management of the Danube river basin environment. The planning and working documents, which were outlining the activities within the EPDRB are the Strategic Action Plan (SAP-1994) and the Strategic Action Plan Implementation Programme (SIP-1996). These documents frame the works of the 13 Tasks of the Applied Research Programme, Sub-Groups of the Accident Emergency Warning System, Monitoring, Laboratories and Information Management and Data Management as well as the major areas of work, divided in Groups and Clusters, each of which will involve projects to be carried out in a number of Danube countries. All activities are oriented to the improvement of the environment, however special attention is paid to task dealing with biodiversity, wetlands restoration, water and soil protection. The main funding, which is secured until the year 2000 comes from the Danube countries, the EU Phare and Tacis programmes, the UN GEF, international banks and foundations. (author)

  16. The significance of sediment contamination in the Elbe River floodplain (Czech Republic)

    Science.gov (United States)

    Chalupová, Dagmar; Janský, Bohumír; Langhammer, Jakub; Šobr, Miroslav; Jiři, Medek; Král, Stanislav; Jiřinec, Petr; Kaiglova, Jana; Černý, Michal; Žáček, Miroslav; Leontovyčova, Drahomíra; Halířová, Jarmila

    2015-04-01

    The abstract brings the information about the research that was focused on anthropogenic pollution of river and lake sediments in the middle course of the Elbe River (Czech Republic). The main aim was to identify and to evaluate the significance of old polluted sediments in the river and its side structures (old meanders, cut lakes, oxbow lakes) between Hradec Králové and Mělník (confluence with the Moldau River) and to assess the risk coming from the remobilization of the contaminated matter. The Elbe River floodplain has been highly inhabited since the Middle Ages, and, especially in the 20th century, major industrial plants were founded here. Since that time, the anthropogenic load of the river and it`s floodplain has grown. Although the contaminants bound to the sediment particles are usually stable, the main risk is coming from the fact that under changes in hydrological regime and water quality (floods, changes in pH, redox-potential, presence of complex substances etc.), the pollution can be released and remobilized again. The most endangered areas are: the surroundings of Pardubice (chemical factory Synthesia, Inc.; refinery PARAMO), and Neratovice (chemical factory Spolana, Inc.). The chemical factories situated close to these towns represented the most problematic polluters of the Elbe River especially during 2nd half of 20th century. In the research, the main attention was aimed at subaquatic sediments of selected cut lakes situated in the vicinity of the above mentioned sources of pollution. To describe the outreach of contamination, several further fluvial lakes were taken into account too. Sediment sampling was carried out from boats on lakes and with the help of drilling rig in the floodplain. Gained sediment cores were divided into several parts which were analysed separately. Chemical analyses included substances identified by ICPER (International Commission for the Protection of the Elbe River) as well as chemicals considered as significant in

  17. How livestock and flooding mediate the ecological integrity of working forests in Amazon River floodplains.

    Science.gov (United States)

    Lucas, Christine M; Sheikh, Pervaze; Gagnon, Paul R; Mcgrath, David G

    2016-01-01

    The contribution of working forests to tropical conservation and development depends upon the maintenance of ecological integrity under ongoing land use. Assessment of ecological integrity requires an understanding of the structure, composition, and function and major drivers that govern their variability. Working forests in tropical river floodplains provide many goods and services, yet the data on the ecological processes that sustain these services is scant. In flooded forests of riverside Amazonian communities, we established 46 0.1-ha plots varying in flood duration, use by cattle and water buffalo, and time since agricultural abandonment (30-90 yr). We monitored three aspects of ecological integrity (stand structure, species composition, and dynamics of trees and seedlings) to evaluate the impacts of different trajectories of livestock activity (alleviation, stasis, and intensification) over nine years. Negative effects of livestock intensification were solely evident in the forest understory, and plots alleviated from past heavy disturbance increased in seedling density but had higher abundance of thorny species than plots maintaining low activity. Stand structure, dynamics, and tree species composition were strongly influenced by the natural pulse of seasonal floods, such that the defining characteristics of integrity were dependent upon flood duration (3-200 d). Forests with prolonged floods ≥ 140 d had not only lower species richness but also lower rates of recruitment and species turnover relative to forests with short floods flooding hindered forest regeneration, but overall forest integrity was largely related to the hydrological regime and age. Given this disjunction between factors mediating canopy and understory integrity, we present a subset of metrics for regeneration and recruitment to distinguish forest condition by livestock trajectory. Although our study design includes confounded factors that preclude a definitive assessment of the major

  18. Analysis of the development of land use in the Morava River floodplain, with special emphasis on the landscape matrix

    Directory of Open Access Journals (Sweden)

    Kilianová Helena

    2017-03-01

    Full Text Available The results of an analysis of land use development in the Morava River floodplain (Czech Republic using GIS from 1836 to the present, are the subject of this article. The results are based on the analysis of historical maps, using the landscape matrix assessment of the Morava River floodplain. The final analyses were processed from land use maps of the floodplain at a scale of 1 : 25,000 in five time horizons. These maps were compared with the present state of landscape by GIS methods. The study area was assessed according to five geomorphological areas from the northern/higher part to the southern/lower part of floodplain. In 1836 the landscape matrix of the floodplain was composed of meadows and forests. Forest components decreased minimally but the changes are more important. The grassland area (meadows and pastures decreased but arable land, as well as settlements, increased very significantly. In the 1950s the landscape matrix was composed of a mosaic of alluvial forests, meadows and arable land. Currently, the predominant landscape matrix consists of arable land and isolated forest complexes.

  19. Bacterioplankton features and its relations with doc characteristics and other limnological variables in Paraná river floodplain environments (PR/MS-Brazil).

    Science.gov (United States)

    Teixeira, Mariana Carolina; Santana, Natália Fernanda; de Azevedo, Júlio César Rodrigues; Pagioro, Thomaz Aurélio

    2011-07-01

    Since the introduction of the Microbial Loop concept, many studies aimed to explain the role of bacterioplankton and dissolved organic carbon (DOC) in aquatic ecosystems. Paraná River floodplain system is a very complex environment where these subjects were little explored. The aim of this work was to characterize bacterial community in terms of density, biomass and biovolume in some water bodies of this floodplain and to verify its temporal variation and its relation with some limnological variables, including some indicators of DOC quality, obtained through Ultraviolet-visible (UV-VIS) and fluorescence spectroscopic analysis. Bacterial density, biomass and biovolume are similar to those from other freshwater environments and both density and biomass were higher in the period with less rain. The limnological and spectroscopic features that showed any relation with bacterioplankton were the concentrations of N-NH4 and P-PO4, water transparency, and some indicators of DOC quality and origin. The analysis of these relations showed a possible competition between bacterioplankton and phytoplankton for inorganic nutrients and that the DOC used by bacterioplankton is labile and probably from aquatic macrophytes.

  20. Bacterioplankton features and its relations with doc characteristics and other limnological variables in Paraná river floodplain environments (PR/MS-Brazil

    Directory of Open Access Journals (Sweden)

    Mariana Carolina Teixeira

    2011-09-01

    Full Text Available Since the introduction of the Microbial Loop concept, many studies aimed to explain the role of bacterioplankton and dissolved organic carbon (DOC in aquatic ecosystems. Paraná River floodplain system is a very complex environment where these subjects were little explored. The aim of this work was to characterize bacterial community in terms of density, biomass and biovolume in some water bodies of this floodplain and to verify its temporal variation and its relation with some limnological variables, including some indicators of DOC quality, obtained through Ultraviolet-visible (UV-VIS and fluorescence spectroscopic analysis. Bacterial density, biomass and biovolume are similar to those from other freshwater environments and both density and biomass were higher in the period with less rain. The limnological and spectroscopic features that showed any relation with bacterioplankton were the concentrations of N-NH4 and P-PO4, water transparency, and some indicators of DOC quality and origin. The analysis of these relations showed a possible competition between bacterioplankton and phytoplankton for inorganic nutrients and that the DOC used by bacterioplankton is labile and probably from aquatic macrophytes.

  1. Do beaver dams reduce habitat connectivity and salmon productivity in expansive river floodplains?

    Science.gov (United States)

    Malison, Rachel L; Kuzishchin, Kirill V; Stanford, Jack A

    2016-01-01

    Beaver have expanded in their native habitats throughout the northern hemisphere in recent decades following reductions in trapping and reintroduction efforts. Beaver have the potential to strongly influence salmon populations in the side channels of large alluvial rivers by building dams that create pond complexes. Pond habitat may improve salmon productivity or the presence of dams may reduce productivity if dams limit habitat connectivity and inhibit fish passage. Our intent in this paper is to contrast the habitat use and production of juvenile salmon on expansive floodplains of two geomorphically similar salmon rivers: the Kol River in Kamchatka, Russia (no beavers) and the Kwethluk River in Alaska (abundant beavers), and thereby provide a case study on how beavers may influence salmonids in large floodplain rivers. We examined important rearing habitats in each floodplain, including springbrooks, beaver ponds, beaver-influenced springbrooks, and shallow shorelines of the river channel. Juvenile coho salmon dominated fish assemblages in all habitats in both rivers but other species were present. Salmon density was similar in all habitat types in the Kol, but in the Kwethluk coho and Chinook densities were 3-12× lower in mid- and late-successional beaver ponds than in springbrook and main channel habitats. In the Kol, coho condition (length: weight ratios) was similar among habitats, but Chinook condition was highest in orthofluvial springbrooks. In the Kwethluk, Chinook condition was similar among habitats, but coho condition was lowest in main channel versus other habitats (0.89 vs. 0.99-1.10). Densities of juvenile salmon were extremely low in beaver ponds located behind numerous dams in the orthofluvial zone of the Kwethluk River floodplain, whereas juvenile salmon were abundant in habitats throughout the entire floodplain in the Kol River. If beavers were not present on the Kwethluk, floodplain habitats would be fully interconnected and theoretically

  2. Environmental changes and human work in the region of the Upper Paraná River floodplain: processes and interactions

    Directory of Open Access Journals (Sweden)

    EA. Tomanik

    Full Text Available The environment and society constitute a complex of elements and interactions. Thus, an understanding of the processes in which the environment and psychosocial elements are involved may not be gained from knowledge of just one isolated variable. Based on such premises, the present paper, which summarizes the results of a series of studies, adopts work relationships as its main focus, but in addition, it has two complementary objectives. One is to present some analyses on the interaction between human actions and the environmental changes that have been taking place in the region of the Upper Paraná River floodplain and in its boundaries. A secondary aim is to show how those two factors have been changing people's working and living conditions and the identity configuration of some of the human groups that live at that site.

  3. Transnational System Building Across Geopolitical Shifts. The Danube-Oder-Elbe Canal, 1901-2015

    Czech Academy of Sciences Publication Activity Database

    Janáč, Jiří; van der Vleuten, E.

    2016-01-01

    Roč. 9, č. 2 (2016), s. 272-291 ISSN 1965-0175 R&D Projects: GA ČR GA15-04902S Institutional support: RVO:68378114 Keywords : large technical systems * water politics * environmental history Subject RIV: AB - History Impact factor: 2.500, year: 2016

  4. Refurbishment and upgrading of Iron Gates I Hydroelectric and Navigation System on the Danube River

    International Nuclear Information System (INIS)

    Scvortov, F.; Vasiliu, A.; Rosca, N.

    1996-01-01

    This work shows the problems of the refurbishing the hydroelectric units of the Iron Gates 1 Hydroelectric and Navigation System, operating since 1970. Their long and intensive utilization leads to the necessity of their refurbishment. One is demonstrated by detailed studies that it is sensible and efficient to perform both rehabilitation of the existent hydroelectric units and their power increasing from 175 MW to 190 MW, and prior to all these, as a first step, to install an additional hydroelectric unit (G7) for each system with a capacity of 190 MW. Complex technical and energetic-economical problems appear in realizing this objective due to the necessity of analysing a great volume of data in view of taking a correct decision. (author). 7 figs

  5. Germanic Settlement Structure in the Middle Danube Region as a Complex System of Agent-Based Modeling

    Czech Academy of Sciences Publication Activity Database

    Vlach, Marek

    2015-01-01

    Roč. 42, č. 1 (2015), s. 741-748 ISSN 0323-9535. [International Congress of Roman Frontier Studies /22./. Ruse, 06.09.2012-11.09.2012] R&D Projects: GA ČR GA404/09/1054 Grant - others:Rada Programu interní podpory projektů mezinárodní spolupráce AV ČR(CZ) M300011201 Program:M Institutional support: RVO:68081758 Keywords : Roman period * Middle Danube region * Germanic settlement structure * Agent Based Modeling * archaeological demography Subject RIV: AC - Archeology, Anthropology, Ethnology

  6. Phytoplankton diversity in the Upper Paraná River floodplain during two years of drought (2000 and 2001

    Directory of Open Access Journals (Sweden)

    PAF. Borges

    Full Text Available Floodplain lakes and lotic environments of the High Paraná River floodplain present notable biodiversity, especially in relation to phytoplanktonic community. The goal of this work was to evaluate phytoplankton diversity (alpha, beta and gamma in three subsystems during two years of drought (2000 and 2001. We sampled 33 habitats at the pelagic zone subsurface during February and August. Due to low hydrometric levels of the Paraná and Ivinhema Rivers, there was no clear distinction between the potamophase and limnophase periods for the two hydrosedimentological cycles analysed. We recorded 366 taxa. The values obtained for gamma diversity estimators ranged from 55.5-87.8%. DCA and variance analyses revealed only spatial differences in the phytoplankton composition. The mean values of species richness, evenness and Shannon diversity were low, especially when compared to those obtained in previous periods for Baía subsystem. The highest mean values of species richness were verified in the connected floodplain lakes. The highest beta diversity was obtained from the Paraná subsystem and lotic environments in 2001. In general, we observed that the Upper Paraná River floodplain has the highest values of species richness, evenness and H' during the potamophase period, when the flood facilitates dispersion. However, this pattern was not observed in 2000 and 2001, years influenced by La Niña. Besides the low precipitation observed during that period, we must consider the influence of the Porto Primavera impoundment, which also altered the discharge regime of the Paraná River by decreasing the degree of connectivity between fluvial channels and the lentic environments of the floodplain. Thus, the prevalence of conditions characterising the limnophase during 2000 and 2001 explains the lack of significant variability registered for most components of phytoplankton diversity over the study period. We conclude that variations in phytoplankton diversity

  7. Nucleotide diversity of Hemigrammus cf. marginatus (Characiformes, Characidae in the upper Paraná river floodplain - doi: 10.4025/actascibiolsci.v34i3.6669

    Directory of Open Access Journals (Sweden)

    Carla Simone Pavanelli

    2012-06-01

    Full Text Available Characidae is the largest and more diversified family from Characiformes and presents several classification problems, with several genera currently allocated as incertae sedis, such as the genus Hemigrammus. The upper Paraná river floodplain is an environment with high fish diversity. There is at least one species of Hemigrammus, however there are divergences among some authors about the number and the identification of the species from this genus. Therefore the goal of this study was to characterize, using a molecular approach, individuals of Hemigrammus from the upper Paraná river floodplain and to compare them with individuals from the type locality of Hemigrammus marginatus, since this is the only species distributed in this floodplain. For this, the DNA was extracted and a partial region from the mitochondrial genes ATPase 6 and ATPase 8 were amplified and sequenced. The results evidenced the existence of two species of Hemigrammus in the floodplain, although impossible to be distinguished only through morphological traits. High nucleotide diversity among individuals from the upper Paraná river in relation to those from the type locality was also observed, indicating that both species of Hemigrammus present in the upper Paraná river floodplain are not Hemigrammus marginatus. 

  8. Passive microwave observations of inundation area and the area/stage relation in the Amazon River floodplain

    International Nuclear Information System (INIS)

    Sippel, S.J.; Hamilton, S.K.; Melack, J.M.; Novo, E.M.M.

    1998-01-01

    Inundation patterns in Amazon River floodplains are revealed by analysis of the 37GHz polarization difference observed by the Scanning Multichannel Microwave Radiometer on the Nimbus-7 satellite. Flooded area is estimated at monthly intervals for January 1979 through August 1987 using mixing models that account for the major landscape units with distinctive microwave emission characteristics. Results are presented separately for 12 longitudinal reaches along the Amazon River main stem in Brazil as well as for three major tributaries (the Jurua, Purus and Madeira rivers). The total area along the Amazon River main stem that was flooded (including both floodplain and open water) varied between 19 000 and 91 000 km 2 . The correlation between flooded area and river stage is used to develop a predictive relationship and reconstruct regional inundation patterns in the floodplain of the Amazon River main stem over the past 94 years of stage records (1903± 1996). The mean flooded area along the Amazon River during this 94-year period was 46 800 km 2 , of which the openwater surfaces of river channels and floodplain lakes comprised about 20 700 km 2 . (author)

  9. Development of a Web-based GIS monitoring and environmental assessment system for the Black Sea: application in the Danube Delta area.

    Science.gov (United States)

    Tziavos, Ilias N; Alexandridis, Thomas K; Aleksandrov, Borys; Andrianopoulos, Agamemnon; Doukas, Ioannis D; Grigoras, Ion; Grigoriadis, Vassilios N; Papadopoulou, Ioanna D; Savvaidis, Paraskevas; Stergioudis, Argyrios; Teodorof, Liliana; Vergos, Georgios S; Vorobyova, Lyudmila; Zalidis, Georgios C

    2016-08-01

    In this paper, the development of a Web-based GIS system for the monitoring and assessment of the Black Sea is presented. The integrated multilevel system is based on the combination of terrestrial and satellite Earth observation data through the technological assets provided by innovative information tools and facilities. The key component of the system is a unified, easy to update geodatabase including a wide range of appropriately selected environmental parameters. The collection procedure of current and historical data along with the methods employed for their processing in three test areas of the current study are extensively discussed, and special attention is given to the overall design and structure of the developed geodatabase. Furthermore, the information system includes a decision support component (DSC) which allows assessment and effective management of a wide range of heterogeneous data and environmental parameters within an appropriately designed and well-tested methodology. The DSC provides simplified and straightforward results based on a classification procedure, thus contributing to a monitoring system not only for experts but for auxiliary staff as well. The examples of the system's functionality that are presented highlight its usability as well as the assistance that is provided to the decision maker. The given examples emphasize on the Danube Delta area; however, the information layers of the integrated system can be expanded in the future to cover other regions, thus contributing to the development of an environmental monitoring system for the entire Black Sea.

  10. Establishing the system of public communal utility on the river Danube and the river Sava on the territory of Belgrade

    Directory of Open Access Journals (Sweden)

    Pušić Antonije

    2007-01-01

    Full Text Available Waste disposal and treatment problem consideration in the Republic of Serbia is making a pioneer steps. Main goal of this paper is to emphasize problems of waste disposal on waterways in urban areas, which consists of three aspects: uncontrolled disposal, possibilities of waste elimination and institutional model of collecting and recycling. Considering the fact that Draft version of Waste disposal law is not yet adopted by the national government (beside the fact that it contains the question of disposing and recycling municipal solid waste and that it is not elaborating the problem of dumping the municipal waste into rivers, this paper will give methodological and legislative recommendations for the solution of this problem. However, city of Belgrade and the other cities in Serbia are often facing serious problems (arranged riverfronts covered with municipal waste. Because of that, it is necessary to define methods of collecting and treatment of waste disposed in the water streams (in the area of technology. It is also important to determine legislative framework, and also to establish hierarchy in decision-making on the local level. One of the main goals is to determine new aspects of public communal utilities (so called "river communal utility", which will have jurisdiction in this area. International experiences must be analyzed separately and based on them is proposed new concept of elimination of waste from the rivers. Implementation of this pilot project is recommended on the river Danube and the river Sava on the territory of the city of Belgrade.

  11. Feeding of Eigenmannia trilineata (Pisces, Sternopygidae (Lopez & Castello, 1966, in the upper Paraná River floodplain, Brazil

    Directory of Open Access Journals (Sweden)

    Danielle Peretti

    1999-01-01

    Full Text Available Studies were performed on various aspects related to the feeding of Eigenmannia trilineata in the upper Paraná River floodplain, from June 1993 to July 1994, at four places with different types of bottom and waters speed. A number of 279 fish had its stomachal contents analyzed by occurence and point methods in which it was applied on its frequencies the feeding index. Two hundred an sixty two specimens were utilized to the analysis of the feeding activity that it was based on frequency and middle degree of stomach repletion. For the morfological analyse utilized 12 individuals. It was verified fourteen items on species diet which it was found chiefly Chironomidae (Diptera and detritus. Seasonal, area variations were verified in feeding activity and the participation of constituent items in diet. The results showed that the species presents nightly and benthophagous habits, with morfological characters of the carnivorous species.Os estudos foram realizados sob vários aspectos relacionados à alimentação de Eigenmannia trilineata na planície de inundação do alto rio Paraná, de junho de 1993 a julho de 1994 em quatro locais com diferentes tipos de fundo e velocidade de águas. Um número de 279 peixes tiveram seus estômagos analisados pelos métodos de ocorrência e pontos sendo aplicado sobre suas frequências o índice alimentar. Duzentos e sessenta e dois indivíduos foram utilizados para a análise da atividade alimentar, a qual foi baseada sobre a freqüência e grau de repleção médio dos estômagos. Para a análise morfológica foram utilizados 12 indivíduos. Foi verificado 14 itens na dieta da espécie, encontrando-se principalmente Chironomidae (Diptera e detritos. Variações sazonais e de área foram verificados na atividade alimentar e na participação dos itens constituintes da dieta. Os resultados mostraram que a espécie apresenta hábitos noturno e bentófago, com características morfológicas de espécies carnívoras.

  12. Spatial scaling of core and dominant forest cover in the Upper Mississippi and Illinois River floodplains, USA

    Science.gov (United States)

    De Jager, Nathan R.; Rohweder, Jason J.

    2011-01-01

    Different organisms respond to spatial structure in different terms and across different spatial scales. As a consequence, efforts to reverse habitat loss and fragmentation through strategic habitat restoration ought to account for the different habitat density and scale requirements of various taxonomic groups. Here, we estimated the local density of floodplain forest surrounding each of ~20 million 10-m forested pixels of the Upper Mississippi and Illinois River floodplains by using moving windows of multiple sizes (1–100 ha). We further identified forest pixels that met two local density thresholds: 'core' forest pixels were nested in a 100% (unfragmented) forested window and 'dominant' forest pixels were those nested in a >60% forested window. Finally, we fit two scaling functions to declines in the proportion of forest cover meeting these criteria with increasing window length for 107 management-relevant focal areas: a power function (i.e. self-similar, fractal-like scaling) and an exponential decay function (fractal dimension depends on scale). The exponential decay function consistently explained more variation in changes to the proportion of forest meeting both the 'core' and 'dominant' criteria with increasing window length than did the power function, suggesting that elevation, soil type, hydrology, and human land use constrain these forest types to a limited range of scales. To examine these scales, we transformed the decay constants to measures of the distance at which the probability of forest meeting the 'core' and 'dominant' criteria was cut in half (S 1/2, m). S 1/2 for core forest was typically between ~55 and ~95 m depending on location along the river, indicating that core forest cover is restricted to extremely fine scales. In contrast, half of all dominant forest cover was lost at scales that were typically between ~525 and 750 m, but S 1/2 was as long as 1,800 m. S 1/2 is a simple measure that (1) condenses information derived from multi

  13. Living in highly dynamic polluted river floodplains, do contaminants contribute to population and community effects?

    International Nuclear Information System (INIS)

    Klok, Chris; Kraak, Michiel H.S.

    2008-01-01

    The aim of this paper was to collect evidence for the effects of contaminants on biota in a highly dynamic river Rhine floodplain. To this purpose we reviewed the results of circa 10 studies performed in this floodplain. The floodplain was contaminated with elevated levels of cadmium, copper, PAHs, and PCBs and high levels of zinc which were at some sites above legislative values. The results showed that the present contaminants were accumulated by the floodplain inhabiting organisms, but meanwhile population and community effects were ambiguous. Only for the mayfly Ephoron virgo clear effects were detected at the level of the single floodplain. The absence of clear population and community effects is puzzling since at lower contaminant concentrations adverse effects were detected in other environments. Factors that may mask toxic effects include flooding and food quality and quantity. We conclude that given the site specific conditions, being an open, eutrophic system with a highly dynamic flooding pattern, assessment of the contribution of toxicants to observed population density or biomass and community composition requires 1] an increase in number of replicates; 2] a larger scale of investigation and 3] comparison to stable systems with comparable contamination levels

  14. Age, growth and mortality of Clarias gariepinus (Siluriformes: Clariidae in the Mid-Cross River-Floodplain ecosystem, Nigeria

    Directory of Open Access Journals (Sweden)

    Okechukwu Idumah Okogwu

    2011-12-01

    Full Text Available Clarias gariepinus is a threatened highly prized species used for some elite ceremonies by the local communities. Artisanal fishers take advantage of this species annual breeding migration from the lower Cross River to the floodplain lakes in Mid-Cross River during the rainy season, and some migrant stocks are not able to spawn. Since there is a lack of information on this species population dynamics in the Mid-Cross area, this study aimed to evaluate the age, growth and mortality to support the development of effective management plans. For this, monthly overnight gill net catches (from 6 to 72mm mesh sizes were developed between March 2005 and February 2007. Growth parameters were determined using the FiSAT II length-frequency distribution. A total of 1 421 fish were collected during the survey. The asymptotic growth (L∞ was 80.24cm, growth rate (K was 0.49/year while the longevity was 6.12years. The annual instantaneous rate of total mortality (Z was 2.54/year and the natural mortality (M was 0.88. Fishing mortality (1.66/year was higher than the biological reference points (Fopt=0.83 and Flimit=1.11 and the exploitation rate (0.66 was higher than the predicted value (Emax=0.64 indicating that C. gariepinus was over exploited in the Mid-Cross River-Floodplain ecosystem. Some recommended immediate management actions are to strengthen the ban of ichthyocide fishing, closure of the floodplain lakes for most of the year, restricted access to the migratory path of the fish during the flood period and vocational training to the fishers. In order to recover and maintain a sustainable harvest, I suggest that a multi-sector stakeholder group should be formed with governmental agents, community leaders, fishers, fisheries scientists and non-governmental organizations. These short and long term measures, if carefully applied, will facilitate recovery of the fishery. Rev. Biol. Trop. 59 (4: 1707-1716. Epub 2011 December 01.Clarias gariepinus es una

  15. Flood effects on efflux and net production of nitrous oxide in river floodplain soils

    Science.gov (United States)

    Riaz, Muhammad; Bruderer, Christian; Niklaus, Pascal A.; Luster, Jörg

    2016-04-01

    Floodplain soils are often rich in nutrients and exhibit high spatial heterogeneity in terms of geomorphology, soil environmental conditions and substrate availability for processes involved in carbon and nutrient cycling. In addition, fluctuating water tables lead to temporally changing redox conditions. In such systems, there are ideal conditions for the occurrence of hot spots and moments of nitrous oxide emissions, a potent greenhouse gas. The factors that govern the spatial heterogeneity and dynamics of N2O formation in floodplain soils and the surface efflux of this gas are not fully understood. A particular issue is the contribution of N2O formation in the subsoil to surface efflux. We studied this question in the floodplain of a restored section of the Thur river (NE Switzerland) which is characterized by a flashy flow regime. As a consequence, the floodplain soils are unsaturated most of the time. We showed earlier that saturation during flood pulses leads to short phases of generally anoxic conditions followed by a drying phase with anoxic conditions within aggregates and oxic conditions in larger soil pores. The latter conditions are conducive for spatially closely-coupled nitrification-denitrification and related hot moments of nitrous oxide formation. In a floodplain zone characterized by about one meter of young, sandy sediments, that are mostly covered by the tall grass Phalaris arundinacea, we measured at several time points before and after a small flood event N2O surface efflux with the closed-chamber method, and assessed N2O concentrations in the soil air at four different depths using gas-permeable tubings. In addition, we calculated the N2O diffusivity in the soil from Radon diffusivity. The latter was estimated in-situ from the recovery of Radon concentration in the gas-permeable tubings after purging with ambient air. All these data were then used to calculate net N2O production rates at different soil depths with the gradient method. In

  16. Geomorphic and vegetation processes of the Willamette River floodplain, Oregon: current understanding and unanswered science questions

    Science.gov (United States)

    Wallick, J. Rose; Jones, Krista L.; O'Connor, Jim E.; Keith, Mackenzie K.; Hulse, David; Gregory, Stanley V.

    2013-01-01

    decrease bed-material supply by an unknown amount because they limit bank erosion and entrainment of stored sediment. The rivers, geomorphic floodplain, and vegetation within the study area have changed noticeably in response to the alterations in floods and coarse sediment and wood transport. Widespread decreases have occurred in the rates of meander migration and avulsions and the number and diversity of landforms such as gravel bars, islands, and side channels. Dynamic and, in some cases, multi-thread river segments have become stable, single-thread channels. Preliminary observations suggest that forest area has increased within the active channel, further reducing the area of unvegetated gravel bars. Alterations to floods and sediment transport and ongoing channel, floodplain, and vegetation responses result in a modern Willamette River Basin. Here, the floodplain influenced by the modern flow and sediment regimes, or the functional floodplain, is narrower and inset with the broader and older geomorphic floodplain. The functional floodplain is flanked by higher elevation relict floodplain features that are no longer inundated by modern floods. The corridor of present- day active channel surfaces is narrower, enabling riparian vegetation to establish on formerly active gravel bar surfaces. The modern Willamette River Basin with its fundamental changes in the flood, sediment transport, and large wood regimes has implications for future habitat conditions. System-wide future trends probably include narrower floodplains and a lower diversity of landforms and habitats along the Willamette River and its major tributaries compared to historical patterns and today. Furthermore, specific conditions and future trends will probably vary between geologically stable, anthropogenically stable, and dynamic reaches. The middle and lower segments of the Willamette River are geologically stable, whereas the South Santiam and Middle Fork Willamette Rivers were historically dynamic, but

  17. Flower morphology, nectar features, and hummingbird visitation to Palicourea crocea (Rubiaceae in the Upper Paraná River floodplain, Brazil

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    Luciana B. Mendonça

    2006-03-01

    Full Text Available We investigated flower morphology, nectar features, and hummingbird visitation to Palicourea crocea (Rubiaceae, a common ornithophilous shrub found in the riparian forest understory in the Upper Paraná River floodplain, Brazil. Flowers are distylous and the style-stamen dimorphism is accompanied by other intermorph dimorphisms in corolla length, anther length, and stigma lobe length and form. We did not observe strict reciprocity in the positioning of stigma and anthers between floral morphs. Flowering occurred during the rainy season, October to December. Nectar standing crop per flowerwas relatively constant throughout the day, which apparently resulted in hummingbirds visiting the plant throughout the day. Energetic content of the nectar in each flower (66.5J and that required daily by hummingbird visitors (up to 30kJ would oblige visits to hundreds of flowers each day, and thus movements between plants that should result in pollen flow. Three hummingbird species visited the flowers: the Gilded Sapphire (Hylocharis chrysura, the Black-throated Mango (Anthracothorax nigricollis, and the Glittering-bellied Emerald (Chlorostilbon aureoventris. The frequency of hummingbird visitation, nectar features, and the scarcity of other hummingbird-visited flowers in the study area, indicate that P. crocea is an important nectar resource for short-billed hummingbirds in the study site.Investigamos a morfologia floral, as características do néctar e a visita de beija-flores a Palicourea crocea (Rubiaceae, uma espécie ornitófila arbustiva comumente encontrada no sub-bosque da vegetação ripária na planície de inundação do Alto Rio Paraná, Brasil. As flores são distílicas, sendo o dimorfismo estilete-estames acompanhado por outras variações morfológicas no comprimento da corola, altura das anteras, comprimento das anteras e comprimento e forma das papilas estigmáticas. Não foi observada reciprocidade estrita na posição dos estigmas e

  18. The importance of the Danube strategy for tourism and culture development of the Croatian Danube region

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    Demonja Damir

    2012-01-01

    Full Text Available The Danube Region consists of various countries that are determined by geographic, economic, cultural and socio-demographic characteristics. Certain regions show different trends of development with increasing regional differences. Regarding that the importance gets newly formed EU Strategy for the Danube Region, the Danube Strategy, which represents a new approach to the European Union's macro-regions, and is focused on four main directions of cooperation in the Danube Region: linking macro-regions, environmental protection, building prosperity and strengthening macro-region. Croatia, as a Danube country, accepted the idea of creating a unified European international space, as suggested in the Danube Strategy, and it is actively engaged in the process. The Croatian Danube Region includes two easternmost counties, Osijek-Baranja and Vukovar-Srijem. The rich cultural and natu­ral heritage of the two counties can be further exploited in the improved tourist offer, advocated by the Strategy. Croatian Danube Region has tourism potentials and with the appropriate measures and incentives this region could become one of the leading regions in continental tourism in Croatia. This article presents and analyzes the Danube Strategy and its importance for Croatia, the tourist and cultural potentials of the Croatian Danube Region with regard to their greater recognition and utilization as crucial for sustainable development of this, in terms of tourism, still insufficiently developed parts of Croatia, and the possibilities of tourism and culture in the Croatian Danube Region within the framework of the Danube Strategy.

  19. Isotopic composition of Danube water in the pre-delta section from the years 2009 - 2012

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    RANK Dieter

    2013-12-01

    Full Text Available The isotopic composition of river water in the Danube Basin is mainly governed by the isotopic composition of precipitation in the catchment area, evaporation effects play only a minor role. Short-term and long-term isotope signals from precipitation are thus transmitted through the whole catchment. The isotopic composition of Danube water in the Delta region so provides an integrated isotope signal for climatic/hydrological conditions and changes in the whole catchment. The aim of this investigation was to establish a representative isotope monitoring near the Danube Delta. The results showed that the Danube River is regarding isotope content fully mixed at the bifurcation of the Danube Delta arms. Therefore routine sampling at only one location in the pre-delta region should be sufficient to obtain a representative isotope record for the whole Danube Basin. The δ 18 O time series from November 2009 to May 2012 (sampling twice a month shows seasonal variations in the range of -9.8 ‰ ± 0.7 ‰ with a minimum in spring and a maximum in autumn. The tritium results exhibit the influence of short term contaminations due to human activities. The expected “environmental” tritium content of river water in Central Europe would be about 10 TU. During this investigation 3 H values up to 100 TU were observed in the pre-delta section. This indicates short terms releases of tritium from local sources such as nuclear power plants in the Danube river system.

  20. The Upper Danube Nature Park

    International Nuclear Information System (INIS)

    Dosedla, H.C.

    1997-01-01

    When in 1980 the Upper Danube Nature Park was founded as one of 65 nature sanctuaries in Germany there was great diversity of opinions concerning its intended character. The protected region consisting of a geologically outstanding landscape within central Europe is covering the first 80 km the upper Danube where the young river shortly after it's source in the Black Forest is breaking through the narrow canyons of the Jurassic rock plateau of the so-called Suebian Alps and also locates the subterranean passage where the stream is submerging from the surface for nearly ten miles. Since the purpose of nature preservation according to German las is closely combined with the rather contradicting aim of offering an attractive recreation area thus facing the immense impacts of modern mass tourism there are numerous problems which in the course of years have resulted in an intricate patterns of subtle management methods coping with the growing awareness of the ecological balance. (author)

  1. DANUBE SALMON (HUCHO HUCHO L.. THEMATIC BIBLIOGRAPHY

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    I. Hrytsynyak

    2015-09-01

    Full Text Available Purpose. Creating of the thematic bibliographic list of publications dedicated to ecological and zoogeographical, morphological and biological, physiological, biochemical and genetic characteristics of the Danube salmon, as well as to its cultivation in Ukraine and abroad. Methodology. In the process of systematic search complete and selective methods were applied. The bibliographic core have been formed by the literature from the fund of scientific library of the Institute of Fisheries NAAS. Findings. There was composed the thematic list of publications in a quantity of 100 sources, containing characteristics of Danube salmon as representative of salmonids. Literary sources was arranged in alphabetical order by author or title, and described according to DSTU 7.1:2006 «System of standards on information, librarianship and publishing. Bibliographic entry. Bibliographic description. General requirements and rules», as well as in accordance with the requirements of APA style – international standard of references. Practical value. The list may be useful for scientists, practitioners, students, whose area of interests covers the questions of breeding, and researching of the salmon biological features.

  2. Vertical distribution of 137Cs in alluvial soils of the Lokna River floodplain (Tula oblast) long after the Chernobyl accident and its simulation

    Science.gov (United States)

    Mamikhin, S. V.; Golosov, V. N.; Paramonova, T. A.; Shamshurina, E. N.; Ivanov, M. M.

    2016-12-01

    Profiles of vertical 137Cs distribution in alluvial meadow soils on the low and medium levels of the Lokna River floodplain (central part of the Plavsk radioactive spot in Tula oblast) 28 years after the Chernobyl fallout have been studied. A significant increase in the 137Cs pool is revealed on the low floodplain areas compared to the soils of interfluves due to the accumulation of alluvium, which hampers the reduction of the total radionuclide pool in alluvial soils because of radioactive decay. The rate of alluvium accumulation in the soil on the medium floodplain level is lower by three times on average. An imitation prognostic model has been developed, which considers the flooding and climatic conditions in the region under study. Numerical experiments have quantitatively confirmed the deciding role of low-mobile forms in the migration of maximum 137Cs content along the soil profile in the absence of manifested erosion-accumulation processes.

  3. Digenea, Nematoda, Cestoda, and Acanthocephala, parasites in Potamotrygonidae (Chondrichthyes from the upper Paraná River floodplain, states of Paraná and Mato Grosso do Sul, Brazil.

    Directory of Open Access Journals (Sweden)

    Pavanelli, G. C.

    2008-01-01

    Full Text Available The present paper represents the first study on the endoparasitic fauna of Potamotrygon falkneri and P.motoro in the upper Paraná River floodplain. Fishes were collected by fishing rod and gillnetting in different stations ofthe floodplain, from March, 2005 to September, 2006. Parasites were sampled, fixed and preserved according tospecialized literature. About half of the analyzed fish were parasitized by at least one of the following species ofendoparasites: Clinostomum complanatum, Genarchella sp. and Tylodelphys sp. (metacercaria (Digenea;Acanthobothrium regoi, Rhinebothrium paratrygoni, Paroncomegas araya and Potamotrygonocestus travassosi(Cestoidea; Brevimulticaecum sp. (larva, Cucullanus sp., Echinocephalus sp. and Spinitectus sp. (Nematoda; andQuadrigyrus machadoi (Acanthocephala. Some species were already registered in Chondrichthyes and others werepreviously recorded in Osteichthyes from the study area. The study listed ten new records of parasites in the host P.falkneri, one new record in the host P. motoro and five new records in the locality upper Paraná River.

  4. Aeolian dust supply from the Yellow River floodplain to the Pleistocene loess deposits of the Mangshan Plateau, central China: Evidence from zircon U-Pb age spectra

    Science.gov (United States)

    Shang, Yuan; Prins, Maarten A.; Beets, Christiaan J.; Kaakinen, Anu; Lahaye, Yann; Dijkstra, Noortje; Rits, Daniël S.; Wang, Bin; Zheng, Hongbo; van Balen, Ronald T.

    2018-02-01

    The thick loess-palaeosol sequences in the Mangshan Loess Plateau (MLP; central China) along the south bank of the lower reach of the Yellow River provide high-resolution records of Quaternary climate change. In addition, substantial increases in grain-size and accumulation rate have been inferred in the upper part of the loess sequence, above palaeosol layer S2. This study investigates the sources of the long-term dust supply to the MLP and explores the mechanism behind the sudden increase in sediment delivery and coarsening of the loess deposits since S2 (∼240 ka) by using end member modelling of the loess grain-size dataset and single-grain zircon U-Pb dating. Our results indicate that the lower Yellow River floodplain, directly north of the MLP, served as a major dust supply for the plateau at least since the deposition of loess unit L9 and indirectly suggest that the integration of the Yellow River and the disappearance of the Sanmen palaeolake took place before L9 (∼900 ka). The sudden change in sedimentology of the Mangshan sequence above palaeosol unit S2 may result from an increased fluvial sediment flux being transported to the lower reaches of the Yellow River because of tectonic movements (initiated) in the Weihe Basin around 240 ka. Furthermore, sediment coarsening can be explained by the gradual southward migration of the lower Yellow River floodplain towards the MLP since the deposition of palaeosol S2. The migration is evidenced by the formation of an impressive scarp, and is likely caused by tectonic tilting of the floodplain area.

  5. Tritium level along Romanian Danube river sector

    International Nuclear Information System (INIS)

    Varlam, Carmen; Stefanescu, Ioan; Popescu, Irina; Faurescu, Ionut; Dobrinescu, Denisa

    2010-01-01

    Full text: Danube River lies west from the Black Sea in Central and South-Eastern Europe. Due to its geological and geographical conditions, the Danube River Basin can be divided into 3 main parts: Upper, Middle and Lower Danube Basin. 65% of Lower Danube Basin is the natural border between Romania and Bulgaria. Two important nuclear objectives for both countries are found in this region: Kozloduy NPP located at Kozloduy, Bulgaria and Cernavoda NPP, located at Cernavoda, Romania. Taking into account the future development of this important Romanian nuclear objective, the knowledge of the present status of tritium level becomes a necessity. Therefore, an extensive monitoring program for this radioisotope, along the Romanian sector of the Danube River Basin, starting with Cazane Gorge and ending with the three branches of the Danube Delta has been carried on since 2006 and it was accomplished in 2008. The different tributaries from this sector: Cerna, Jiu, Olt, and Arges were included also in this monitoring program. The highest values were constantly recorded for the sites which are downstream the nuclear power plants. The anthropogenic nuclear activity could be identified by the maximum values acquired, but their effect to the Danube water is far for being critical from radiation protection point of view. Monthly sampling was established for Turnu Severin location (in the beginning of Romanian Danube section) during 2007 in Danube water and precipitation. Tritium level trends of Danube River for this location were compared with seasonal variations of tritium concentration in precipitation during the same period of monthly sampling in Danube water. (authors)

  6. Improving the Legal System Regime Specific to Biosphere Reservation of Danube Delta achieved by the Law no. 136 of July 5, 2011

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    Tache Bocaniala

    2012-08-01

    Full Text Available In order to establish a regime of protection and conservation of the Danube Delta, but alsoto achieve international commitments of Romania, it was developed and adopted by the Parliament aspecial law, Law no. 82/1993, establishing the Biosphere Reservation of Danube Delta. Theestablished rules had in mind mainly the preservation and protection of the existing natural heritage,promoting the sustainable use of resources resulting from natural ecosystems of the reserve andreconstruction of areas damaged by the impact of human activities. Although repeatedly amended andsupplemented, this regulatory framework has always been overwhelmed by economic and socialdevelopment of the area, requiring practically a major reform that was carried out by Law no 136 ofJuly 5, 2011.

  7. Restoration potential for Danube River Basin, lower Danube and Mura Drava Danube Biosphere Reserve

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    SCHWARZ Ulrich

    2013-12-01

    Full Text Available Originally main Danube basin floodplains would cover an area of 26,500 km², which is equal to about 3.3% of the total catchment size. In recent history, 80% have been cut off by dikes and dams for flood control, hydropower generation, to improve navigability or simply to meliorate land for agricultural purposes. River regulation, rectification and floodplain loss changed the hydromorphological conditions for many major rivers and cause the loss of large water retention areas, the acceleration and unfavourable superimposition of flood waves, the local increase of flood peaks and the loss of functional wetlands and their ecological services. The aim of the investigations commissioned by World Wide Fund (since 2009, three studies with increasing spatial resolution were carried out, for the whole Danube basin and for the lower Danube, Mura and Drava rivers was the assessment and prioritisation of potential restoration areas to support national and international activities in respect to nature conservation, the ecological status improvement under Water Framework Directive (WFD and flood mitigation. Aside of the review of existing and planned major restoration projects, new areas are proposed based on continuously available data sets including land use, spatial configuration, hydromorphological intactness, overlapping protected areas and different floodplain types.

  8. THE HIDROLOGICAL RELATIONSHIP BETWEEN DANUBE ARMS AND LAKE COMPLEXIS IN THE DANUBE DELTA

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    Basarab Victor DRIGA

    2008-06-01

    Full Text Available The Danube Delta, which is an open system, is permanently exchanging matter and energy with the external environment. The hydrological sub-system, basically the water circulation represents the vital component of the existence of the delta space. In view of the ecological requirements of this delta space, of the present and prospective situation of various managements, of the present legal framework and the future of the Danube Delta Biosphere Reserve, it is advisable to make some changes to the water circulation system within the Letea unit as follows: to close down or undersize the Mila 35 Canal and the Mila 22 Canal, to reduce the Crânjală Canal flow section or close the canal, to secure the ecological reconstruction of inefficient dammed enclosures (e.g. Pardina by ensuring normal water circulation inside them, to reopen the Sireasa Canal at its junction with the Chilia Arm. The fact is that the water circulation system throughout the Caraorman unit will suffer essential changes, so that is recommendable to: revitalise the Litcov Canal and close the Filat canal, downsize the Crişan-Caraorman flow section, open up the Gorgova and Ceamurlia canals, revigorate the Ivancea and the Erenciuc canals (between the Puiu and the Erenciuc lakes, respectively, make 2 – 3 openings in the littoral dam and in the Împuţita Backwater, placing the weir level at + 70-80 cm, in order to facilitate the depression water outflow into the sea.

  9. Improving the Performance of Enterprises from Danube Riveran Countries, through the Implementation of a Quality Management System

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    Irina Todos

    2012-08-01

    Full Text Available A major commitment and objective in the conditions of a market economy is to improve thequality of production, with a special emphasis on increasing the efficiency of economic activity to meetthe production and consumption requirements. A permanent competition on both domestic and international markets has challenged companies to continuously ensure the high quality of their products, in order to meet social needs. The advantages from improving the commodities quality are reflected in an increased labour productivity, reduced production costs, increased profitability. Currently, many companies are particularly interested in the quality assurance models as proposed by international standards of ISO 9000, ISO 14000, ISO 22000, OSHAH 18000, etc. Some of these companies have already a certified quality management system based on these standards. They consider that the qualitysystem certification has a positive impact on business performance, acknowledging at the same time, the far-reaching importance of continuous improvement and implementation of this system, the principles of total quality management to ensure a successful performance in the competition.

  10. Mobility and natural attenuation of metals and arsenic in acidic waters of the drainage system of Timok River from Bor copper mines (Serbia) to Danube River.

    Science.gov (United States)

    Đorđievski, Stefan; Ishiyama, Daizo; Ogawa, Yasumasa; Stevanović, Zoran

    2018-06-22

    Bor, Krivelj, and Bela Rivers belong to the watershed of Timok River, which is a tributary of transboundary Danube River. These rivers receive metal-rich acidic wastewater from metallurgical facilities and acid mine drainage (AMD) from mine wastes around Bor copper mines. The aim of this study was to determine the mobility and natural attenuation of metals and arsenic in rivers from Bor copper mines to Danube River during the year 2015. The results showed that metallurgical facilities had the largest impact on Bor River by discharging about 400 t of Cu per year through highly acidic wastewater (pH = 2.6). The highest measured concentrations of Cu in river water and sediments were 40 mg L -1 and 1.6%, respectively. Dissolution of calcite from limestone bedrock and a high concentration of bicarbonate ions in natural river water (about 250 mg L -1 ) enhanced the neutralization of acidic river water and subsequent chemical precipitation of metals and arsenic. Decreases in the concentrations of Al, Fe, Cu, As, and Pb in river water were mainly due to precipitation on the river bed. On the other hand, dilution played an important role in the decreases in concentrations of Mn, Ni, Zn, and Cd. Chemically precipitated materials and flotation tailings containing Fe-rich minerals (fayalite, magnetite, and pyrite) were transported toward Danube River during the periods of high discharge. This study showed that processes of natural attenuation in catchments with limestone bedrock play an important role in reducing concentrations of metals and arsenic in AMD-bearing river water.

  11. Application of the authigenic 10Be/9Be dating method to Late Miocene-Pliocene sequences in the northern Danube Basin (Pannonian Basin System): Confirmation of heterochronous evolution of sedimentary environments

    Science.gov (United States)

    Šujan, Michal; Braucher, Régis; Kováč, Michal; Bourlès, Didier L.; Rybár, Samuel; Guillou, Valéry; Hudáčková, Natália

    2016-02-01

    Authigenic 10Be/9Be dating method was applied to lacustrine, deltaic and alluvial sequences of the northern Danube Basin (Pannonian Basin System), to bridge the insufficiency of geochronological data for the Late Miocene to Pliocene period. The measurements of 51 samples (both lacustrine and floodplain), ranging from 11.6 to 0.95 Ma are consistent with the existing magnetostratigraphic and biostratigraphic data standing mainly on the evolution degree of endemic mollusk fauna, mammals and dinocysts. This agreement confirms our assumption that the incoming beryllium fluxes remained constant over the studied time period and thus that the two initial 10Be/9Be ratios determined in actual Holocene/Late Pleistocene sediments (lacustrine and floodplain) are valid for these environments. The obtained ages indicate gradual progradation of the deltaic depositional systems across the Danube Basin with a clear time-transgressional character, replacing basin floor and shelfal environments. Deltaic sedimentation occurred firstly in the north at foothills of the Western Carpathians from 11.0 Ma, and changed to the alluvial environment after 10.5 Ma. At the same time (~ 10.5 Ma), the paleo-Danube deltaic system draining the Eastern Alps entered the study area from the Vienna Basin situated on the West. Later, the deltaic systems were merged in the central part of the basin and reached its southeastern margin at ~ 9.4 Ma. Regression of the Lake Pannon from the southernmost part of the study area is evidenced after 8.7 Ma. Alluvial deposition of meandering rivers lasting until 6.0-5.0 Ma followed and was interrupted by the early Pliocene basin inversion. Sedimentation of braided streams took place during the late Pliocene and Pleistocene, reflecting uplift of mountains surrounding the basin margins. This study documents the powerful potential of the authigenic 10Be/9Be dating method and its reliability in a basin with complicated tectonic and sedimentary history. It demonstrates that

  12. Radioecological state of the Czechoslovakian Danube section

    International Nuclear Information System (INIS)

    Kortus, J.; Mayer, J.; Kopuncova, T.; Vondra, M.

    1984-01-01

    As to be able to determine the radioactivity of the Czechoslovak section of the Danube river monthly water sampling and quarterly sediment, aquatic flora, and fauna sampling was performed. The results of this investigation have shown that the radioactivity level of our Danube section is low, consisting mostly of natural radionuclides. No relationships among respective seasons and radioactivity level were observed, neither any significant dependencies between flow rate and radionuclide level. In spite of the low radioactivity of the Czechoslovak Danube section we assume it necessary to continue in carrying out radiological analyses of water and sediment samples, as well as aquatic flora and fauna, since there are some nuclear power plants already in operation in the Danube basin and further are to be constructed or are already under construction. (author)

  13. Understanding the Otherness in the Danube Region

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    Juliana Popova

    2016-08-01

    Full Text Available The aim of this paper is to discuss the attitudes towards the Otherness in the Danube region. A monograph dedicated to the notions about the Otherness in Bulgaria. Theoretical clarification of the nature and types of Otherness in general and finding its expression in the public opinion within the Danube region. The general conclusion drawn in the paper is that the citizens of the Danube countries have different attitudes towards the “own”, indigenous otherness and external, exogenous otherness due to the complicated political situation, linked with the transnational migration. The paper results can serve as a preliminary basis for various studies in the field of ethnicity, gender equality, problems of disadvantaged people, etc. The study will contribute to better understanding of the Otherness as one of the most sensitive problems of the contemporary societies and will shed light on this matter in the Danube countries.

  14. Linking hydro-morphology with invertebrate ecology in diverse morphological units of a large river-floodplain system

    CSIR Research Space (South Africa)

    Blettler, MCM

    2016-12-01

    Full Text Available study were 1) to determine changes in invertebrate community due to hydrological stages, 2) to link local physical features [flow configuration, sediment composition and morphological feature) with the ecological structure between and within dissimilar...

  15. Analysis of floristic similarity between forest remnants from the upper Paraná river floodplain, Brazil - doi: 10.4025/actascibiolsci.v34i3.8500

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    Simone Rodrigues Slusarski

    2012-06-01

    Full Text Available The vegetation from the upper Paraná river floodplain is a fragment of Seasonal Semideciduous Forest (SSF that presents fields, lowlands and extensive areas of pasture along with forest formations. Aiming to accomplish analyses of floristic similarity between riparian forests remnants in this floodplain, an analysis using nine surveys was performed, four on the right bank, two on the left bank and three at an island, including tree species. Sørensen’s (ISs and Jaccard’s (ISj similarity coefficients were calculated, and a Correspondence Analysis (CA was applied to a matrix of presence and absence of species. Thirty-seven families, 80 genera and 110 species were recorded. Among the species, 5.5% were generalist, while 29.1% were exclusive to one survey. The values of ISs and ISj ranged from 31 to 78.4%, and 31 to 64.5%, respectively. The CA grouped the surveys in the right and left banks and the island; the species with the highest positive correlation on axis 1 were the most common in the surveys on the left bank. The obtained results evidenced that floristic surveys constitute important indicatives for evaluations of the vegetation distribution in the floodplain. 

  16. Carbon sources and trophic position of the main species of fishes of Baía River, Paraná River floodplain, Brazil

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    Manetta G. I.

    2003-01-01

    Full Text Available In order to verify the carbon source and trophic position of the main species of fishes, of the Paraná River floodplain, we analysed the proportion of stable carbon (delta13C and nitrogen (delta15N isotopes in muscle of fishes sampled in the rainy season. We analyzed adult individuals of Loricariichthys platymetopon, Schizodon borellii, Leporinus lacustris, Auchenipterus osteomystax, Iheringichthys labrosus, Leporinus friderici, and Serrasalmus marginatus. These data were compared with the results obtained by the analyzing stomach contents. The primary producers found in the Baía River were the C3 plants (riparian vegetation, macrophytes, periphyton, and phytoplankton and the C4 plants (macrophytes. The results of the contribution analysis revealed that the carbon used by the species was derived from C3 plants. According to the trophic position estimates (diet and delta15N, the species primarily consumed Loricariichthys platymetopon, Schizodon borellii, Leporinus lacustris, and Leporinus friderici and, secondarily Auchenipterus osteomystax, Iheringichthys labrosus, and Serrasalmus marginatus. There was no significant difference between the two methods utilized.

  17. Interrelations between the surface waters of Danube, karst waters and thermal springs of Bad Deutsch Altenburg

    Energy Technology Data Exchange (ETDEWEB)

    Hacker, P [Bundesversuchs- und Forschungsanstalt Arsenal, Vienna (Austria)

    1987-11-15

    Full text: As part of the preliminary works for the hydropower project Hainburg on the Danube, comprehensive geological, geophysical, hydrogeological, hydrological, hydrochemical and radiohydrometrical investigations were carried out. Special attention was paid to the area of Bad Deutsch Altenburg since questions of connections between Danube water, groundwater and the sulphur-medicinal springs of Bad Deutsch Altenburg and karst waters had to be settled. Long term observations and the data from series of analysed water samples led to the following conclusions: (1) The thermal deep groundwater, the autochthonous karst water, the shallow groundwater and the Danube belong to a common system with hydraulic interactions. (2) The discharge of the thermal mineral waters in Bad Deutsch Altenburg is caused by a NW-SE striking fault zone. (3) The thermal mineral waters are overburdened by the karst waters in the area Kirchenberg and Pfaffenberg. At the contact zone mixing occurs. Owing to changing pressure conditions and to the locally different conductivity of the karst aquifer the discharges of mineral waters differ in concentration and temperature. (4) The water level of the thermal mineral waterbody is 1 to 2 m above the water level of the Danube at low flow. This difference is equalized at the Danube water level above 141.5 m a.s.l. Above the mark 142 m a.s.l. a direct influence of the observation wells situated in the Park was observed. (5) Because the Danube has eroded the karst massif (Mesozoic limestones and dolomites, Leitha limestone) down to a depth of about 132-133 m a.s.l. the level of karst water drainage was deeper than today. Currently the area is covered by highly permeable gravels. (6) It is therefore assumed that a considerable amount of thermal water drains directly into the Danube. Recharge and mixing with the shallow groundwater was proved. (7) The considerable discharge implies a catchment which extends beyond the immediate environment. (author)

  18. Characteristics of the surface water basins of the Ukrainian Danube region toxicity with the use of microbial test–system Salmonella typhimurium ТА 98

    Directory of Open Access Journals (Sweden)

    L. I. Kovalchuk

    2015-04-01

      The results of  the surface water basins of the Ukrainian Danube region  toxicity with the use of microbial test –system Salmonella typhimurium ТА 98.  The samples investigated testify about a majority of pollutants which are in the water. It has been shown that the most part of the samples under analysis had a powerful toxic effect. The percentage of the water samples with test – system toxicity equal to 90.0% was 13,3 %; with toxicity equal to 80,0 %  – 13,3 %;  with toxicity  > 50,0%  – 53,0 %; with toxicity 50,0%  – 53,0 %; на рівні 50,0%  – 53,0 %; на уровне < 20,0%  – 13,3 %. Процент нетоксичных образцов воды   составлял 6,6 %. Посколько тест-система Salmonella typhimurium ТА 98 более чувствительна к загрязнителям органического происхождения, высказана мысль, что загрязнение образцов воды связано именно с присутствием некоторых органических соединений, которые имеют большой негативный биологический потенциал. Принимая во внимание персистирующий характер загрязнения поверхностных водоемов Украинского Придунавья, признано необходимым продолжение исследований токсичности  воды этих водных объектов на бактериальной тест-системе Salmonella typhimurium ТА 98.   Ключевые слова: вода, водные объекты, токсичность,  тест-система Salmonella typhimurium TA 98, Украинское Придунавье.

  19. Interannual variability of phytoplankton in the main rivers of the Upper Paraná River floodplain, Brazil: influence of upstream reservoirs

    Directory of Open Access Journals (Sweden)

    LC. Rodrigues

    Full Text Available The interannual variation of phytoplankton communities in the three main rivers of the Upper Paraná River floodplain is evaluated in relation to changes in the hydrosedimentological regime. These changes are a result of climatic variability and the formation of Porto Primavera Reservoir, located at the upper Paraná River. Phytoplankton species richness and density were investigated in rivers during a prior period (1993-1994 and eight years after reservoir impoundment (2000-2007. Multiple analyses were conducted to test the differences between these time periods in order to find predictor variables for phytoplankton attributes. A total of 454 phytoplanktonic taxa were found. The regression analysis revealed significant differences between periods. In the years following construction of the Porto Primavera dam, species richness was lower in the Paraná River and density was higher in the three rivers. In general, the algal density decreased from 2005 to 2007. Diatoms and cyanobacteria contributed significantly to the total density during the period from March 1993 to February 1994. The years 2000-2007 presented the lowest diatom contribution to species richness and the highest cyanobacteria contribution. From 2000 on, cryptomonads and cyanobacteria dominated. The interannual variability of phytoplankton was probably influenced by changes in hydrosedimentological regime due to climatic variations (La Niña and El Niño - Southern Oscillation events - ENSO and the operational procedures associated with an upstream reservoirs. Studies on climatic variability and its effects on hydrosedimentological regimes of the Paraná, Baía and Ivinhema rivers and the biota therein are necessary to obtain subsidies for management, including decisions related to the operation of dams upstream and downstream of the study area, with the purpose of minimizing risks to the Environmental Protection Area.

  20. Five stacks over the Danube

    International Nuclear Information System (INIS)

    Anon.

    1998-01-01

    Following the departure of Communism, Hungary adopted the most ambitious privatisation programme of all the eastern European countries. Within a year the state electricity company, MVM, and the oil and gas company, MOL, were prepared for sale and a consequent injection of foreign capital. Control of prices by central government inhibited investment initially but a new legal framework put in place in 1995 introduced a pricing regime more attractive to external investors. Particular interest was shown in the 2,200MW mixed heavy oil and natural gas power plant at Dunamenti on the Danube, characterised by its five stacks of varying height which reflect the changing technology employed at the plant. The bid was won by Tractabel of Belgium who have been highly successful in improving plant efficiency. However, the impact of privatisation is now being felt in uncertainty over fuel supply. Removing such uncertainty in order to maintain existing investment and provide the additional 4000MW of generating capacity needed to keep pace with demand, is a major problem which the incoming government faces. (UK)

  1. Newborns health in the Danube Region

    DEFF Research Database (Denmark)

    Andersen, Zorana J; Sram, Radim J; Ščasný, Milan

    2016-01-01

    risks, and knowledge gaps in the Danube Region, based on publicly available databases, registers, and literature, as a rationale and incentive for a new integrated project. The review also proposes the concept for the project aiming to characterize in utero exposures to multiple environmental factors....... Estimating the burden of environmental exposures on early-life health is a growing research area in Europe which has major public health implications, but the data from the Danube Region are largely missing. AIM: This review presents an inventory of current environmental challenges, related early-life health...... and estimate their effect on early-life health, evaluate economic impact, as well as identify interventions with a potential to harness social norms to reduce emissions, exposures and health risks in the Danube Region. METHODS: Experts in environmental epidemiology, human biomonitoring and social science...

  2. Draft algorithm for Danube River Revitalization

    Directory of Open Access Journals (Sweden)

    MIERLĂ MARIAN

    2012-09-01

    Full Text Available Nowadays more and more scientific communities, decisional factors and the most of the inhabitants had realised that there is no future without revering the nature by its all component. The most important component of the Planet Earth is water, in all its conditions and locations. The fresh water is one of the main forms of the water thathas high value for the entire humanity. Most of the fresh waters are stoked into lakes which are permanently or temporary supplied by permanent and respective temporary rivers. In the past, people did not consider water as important as it is in present days and did not take care of its quality and quantity. Therefore, there were built a lot of industrial pollutant plants on immediate proximity, hydro-technical works that changed its shapes and courses, maleficent water consumption entities (e.g. for irrigations, for residential purpose, industrial etc.. All these works did serious changes in the natural (equilibrate water bodies status in order to alter its natural functions. To win back these natural functions the affected water bodies should be restored. This paper presents an attempt to draw a set of rules to be followed in solving the problem of rivers revitalization, as a study case is about the Danube River. These rules involve scientific specialists, decisional factors and social communities. The beneficiary of the results by applying this set of rules is the entire socio-ecologic system.

  3. Species richness of testate amoebae in different environments from the upper Paraná river floodplain (PR/MS - doi: 10.4025/actascibiolsci.v33i3.7261 Species richness of testate amoebae in different environments from the upper Paraná river floodplain (PR/MS - doi: 10.4025/actascibiolsci.v33i3.7261

    Directory of Open Access Journals (Sweden)

    Fábio Amodêo Lansac-Tôha

    2011-07-01

    Full Text Available This study evaluated the species richness of testate amoebae in the plankton from different environments of the upper Paraná river floodplain. Samplings were performed at subsurface of pelagic region from twelve environments using motorized pump and plankton net (68 µm, during four hydrological periods. We identified 67 taxa, distributed in seven families and Arcellidae, Difflugiidae and Centropyxidae were the most representative families. Higher values of species richness were observed in the lakes (connected and isolated during the flood pulses. Centropyxis aculeata, Difflugia gramem and D. pseudogramem were frequent throughout the study period. Seasonal variability of species in the channels and isolated lakes was evidenced by beta diversity. Besides that, in the rivers, extreme changes in species composition were verified during the high-water period. Our results highlight the importance of the present study to improve the knowledge about the diversity and geographic distribution of these organisms in Brazil and emphasize the importance of current flow in the displacement of testate amoebae from their preferred habitats, marginal vegetation and sediment.This study evaluated the species richness of testate amoebae in the plankton from different environments of the upper Paraná river floodplain. Samplings were performed at subsurface of pelagic region from twelve environments using motorized pump and plankton net (68 µm, during four hydrological periods. We identified 67 taxa, distributed in seven families and Arcellidae, Difflugiidae and Centropyxidae were the most representative families. Higher values of species richness were observed in the lakes (connected and isolated during the flood pulses. Centropyxis aculeata, Difflugia gramem and D. pseudogramem were frequent throughout the study period. Seasonal variability of species in the channels and isolated lakes was evidenced by beta diversity. Besides that, in the rivers, extreme

  4. Radioactivity in the River Danube - special investigations

    International Nuclear Information System (INIS)

    Maringer, F.J.; Rank, D.; Terlunen, J.

    1989-01-01

    A sediment trap was installed in the River Danube at Vienna (river km 1933.9) in March, 1987. Since April, 1987 sediment samples have been collected monthly. On these samples systematical investigations such as gamma spectrometric measurements, Sr-90 analysis, grain-size-analysis have been carried out. The maximum of Cs-137-activity was about 300 Bq/kg at the beginning of the operation in April, 1987. Since this date the activity has generally decreased with some slight increases. The ratio of the activities of the <20 μm-fraction to the original sample lies between 2 and 4. The results of the monthly collected sediment samples are shown in regard to radioactivity determinations of water samples and sediment cores in power plant-reservoirs of the River Danube. The Chernobyl accident increases the Cs-137-activity of reservoir sediments in the Austrian part of the Danube from about 20 Bq/kg to 3000 Bq/kg in the <20 μm-fraction. The results of gamma spectrometric measurements of bottom sediments, which were taken in March, 1988 at several points of the River Danube (from river km 16/USSR to 1819/CSSR) are shown. (orig.)

  5. Perinatal health in the Danube region

    DEFF Research Database (Denmark)

    Knudsen, Lisbeth E.; Andersen, Zorana J.; Sram, Radim J.

    2017-01-01

    In 2013-2015, a consortium of European scientists - NEWDANUBE - was established to prepare a birth cohort in the Danube region, including most of the countries with the highest air pollution in Europe, the area being one-fifth of the European Union's (EU's) territory, including 14 countries (nine...

  6. Arsenic in Holocene aquifers of the Red River floodplain, Vietnam: Effects of sediment-water interactions, sediment burial age and groundwater residence time

    Science.gov (United States)

    Sø, Helle Ugilt; Postma, Dieke; , Mai Lan, Vi; Pham, Thi Kim Trang; Kazmierczak, Jolanta; Dao, Viet Nga; Pi, Kunfu; Koch, Christian Bender; Pham, Hung Viet; Jakobsen, Rasmus

    2018-03-01

    Water-sediment interactions were investigated in arsenic contaminated Holocene aquifers of the Red River floodplain, Vietnam, in order to elucidate the origin of the spatial variability in the groundwater arsenic concentration. The investigated aquifers are spread over an 8 × 13 km field area with sediments that varied in burial age from V) redox couple was found in disequilibrium with the other redox couples. Using the pe calculated from the CH4/CO2 redox couple we show that the groundwater has a reducing potential towards Fe-oxides ranging from ferrihydrite to poorly crystalline goethite, but not for well crystalline goethite or hematite. Hematite and poorly crystalline goethite were identified as the Fe-oxides present in the sediments. Reductive dissolution experiments identify two phases releasing Fe(II); one rapidly dissolving that also contains As and a second releasing Fe(II) more slowly but without As. The initial release of Fe and As occurs at a near constant As/Fe ratio that varied from site to site between 1.2 and 0.1 mmol As/mol Fe. Siderite (FeCO3) is the main sink for Fe(II), based on saturation calculations as well as the identification of siderite in the sediment. Most of the carbonate incorporated in siderite originates from the dissolution of sedimentary CaCO3. Over time the CaCO3 content of the sediments diminishes and FeCO3 appears instead. No specific secondary phases that incorporate arsenite could be identified. Alternatively, the amount of arsenic mobilized during the dissolution of reactive phases can be contained in the pool of adsorbed arsenite. Combining groundwater age with aquifer sediment age allows the calculation of the total number of pore volumes flushed through the aquifer. Comparison with groundwater chemistry shows the highest arsenic concentration to be present within the first 200 pore volumes flushed through the aquifer. These results agree with reactive transport modeling combining a kinetic description of reductive

  7. Abiotic variables in littoral-limnetic gradient of an oxbow lake of Mogi-Guaçu River floodplain, Southeastern, Brazil

    Directory of Open Access Journals (Sweden)

    Glória Massae Taniguchi

    2004-11-01

    Full Text Available The present study aimed to analyse the abiotic characteristics spatial variability in the littoral-limnetic gradient of the Diogo Pond, Mogi-Guaçu River floodplain, as well as evaluating the hydrological influence on the spatial gradient. During the hydrological cycle, four field trips (high water, flood, low water, and drought were carried out at three sampling stations: littoral, interface, and limnetic region. Analysis of physical and chemical variables allowed to conclude that the time scale established by the hydrological cycle was the main forcing function over the limnological variability of the Diogo Pond. The relative spatial scale related to littoral-limnetic gradient contributed secondarily to the abiotic variability. Littoral was characterized as a distinct compartment from the other stations during the entire hydrological cycle.O presente estudo visou analisar a variabilidade espacial de características limnológicas abióticas no gradiente litorâneo-limnético na lagoa do Diogo, planície de inundação do rio Mogi-Guaçu, bem como avaliar a influência do regime hidrológico no gradiente espacial. Quatro coletas foram realizadas durante o ciclo hidrológico (enchente, cheia, vazante e seca e em três estações de amostragem: região litorânea, região limítrofe e região limnética. Através das análises de variáveis físicas e químicas pôde-se concluir que a escala temporal, determinada pelo regime hidrológico, foi a principal função de força sobre a variabilidade limnológica na lagoa do Diogo. A escala espacial relativa ao gradiente litorâneo-limnético contribuiu, secundariamente, com a variabilidade dos fatores limnológicos abióticos. A região litorânea foi caracterizada como um compartimento separado das demais regiões em todas as épocas do ciclo hidrológico.

  8. Multiple lines of evidence risk assessment of American robins exposed to polychlorinated dibenzofurans (PCDFS) and polychlorinated dibenzo-P-dioxins (PCDDS) in the Tittabawassee River floodplain, Midland, Michigan, USA.

    Science.gov (United States)

    Tazelaar, Dustin L; Fredricks, Timothy B; Seston, Rita M; Coefield, Sarah J; Bradley, Patrick W; Roark, Shaun A; Kay, Denise P; Newsted, John L; Giesy, John P; Bursian, Steven J; Zwiernik, Matthew J

    2013-06-01

    Concentrations of polychlorinated dibenzofurans (PCDFs) and polychlorinated dibenzo-p-dioxins (PCDDs) in Tittabawassee River floodplain soils and biota downstream of Midland, Michigan, USA, are greater than regional background concentrations. From 2005 to 2008, a multiple lines of evidence approach was utilized to evaluate the potential for effects of PCDD/DFs on American robins (Turdus migratorius) breeding in the floodplains. A dietary-based assessment indicated there was potential for adverse effects for American robins predicted to have the greatest exposures. Conversely, a tissue-based risk assessment based on site-specific PCDD/DF concentrations in American robin eggs indicated minimal potential for adverse effects. An assessment based on reproductive endpoints indicated that measures of hatch success in study areas were significantly less than those of reference areas. However, there was no dose-response relationship between that endpoint and concentrations of PCDD/DF. Although dietary-based exposure and reproductive endpoint assessments predicted potential for adverse effects to resident American robins, the tissue-based assessment indicates minimal to no potential for adverse effects, which is reinforced by the fact the response was not dose related. It is likely that the dietary assessment is overly conservative given the inherent uncertainties of estimating dietary exposure relative to direct tissue-based assessment measures. Based on the available data, it can be concluded that exposure to PCDD/DFs in the Tittabawassee River floodplain would not likely result in adverse population-level effects to American robins. Copyright © 2013 SETAC.

  9. Effects of flood inundation and invasion by Phalaris arundinacea on nitrogen cycling in an Upper Mississippi River floodplain forest

    Science.gov (United States)

    Swanson, Whitney; DeJager, Nathan R.; Strauss, Eric A.; Thomsen, Meredith

    2017-01-01

    Although floodplains are thought to serve as important buffers against nitrogen (N) transport to aquatic systems, frequent flooding and high levels of nutrient availability also make these systems prone to invasion by exotic plant species. Invasive plants could modify the cycling and availability of nutrients within floodplains, with effects that could feedback to promote the persistence of the invasive species and impact N export to riverine and coastal areas. We examined the effect of flooding on soil properties and N cycling at a floodplain site in Pool 8 of the Upper Mississippi River with 2 plant communities: mature native forest (Acer saccharinum) and patches of an invasive grass (Phalaris arundinacea). Plots were established within each vegetation type along an elevation gradient and sampled throughout the summers of 2013 and 2014. Spatial trends in flooding resulted in higher soil organic matter, porosity, and total nitrogen and carbon in low elevations. Nutrient processes and NH4+ and NO3− availability, however, were best explained by vegetation type and time after flooding. Phalaris plots maintained higher rates of nitrification and higher concentrations of available NH4+ and NO3−. These results suggest that invasion by Phalarismay make nitrogen more readily available and could help to reinforce this species' persistence in floodplain wetlands. They also raise the possibility that Phalaris may decrease floodplain N storage capacity and influence downstream transport of N to coastal zones.

  10. Multiannual runoff variability in the upper Danube region

    International Nuclear Information System (INIS)

    Pekarova, P.

    2009-05-01

    runoff series on the territory of Europe as a whole (neither of the Danube basin), for the last 150 years. - There were analyzed also time series of the extreme flood discharges of Danube at Bratislava, as well as those of flood volumes of these floods. Here also the statistical tests did not confirm any statistically significant trends. - A scenario was elaborated of the catastrophic 1000-year flood of Danube for the Bratislava gauging profile. Using a simple (one-dimensional) hydrological model, this catastrophic flood wave was routed down the Danube from Bratislava to Sturovo through the almost whole Danube section on the territory of Slovakia. Of course, the whole hydrological system of the Earth is subject to random geophysical and also (anthropogenic) shocks. Therefore, it is necessary always to take into account also random behavior of the hydrological time series.

  11. Modelling the coastal processes at the mouths of the Danube River in the Black Sea

    Science.gov (United States)

    Rusu, Eugen; Zanopol, Andrei

    2014-05-01

    The mouths of the Danube River in the Black Sea represent the main southern entrance in the seventh Pan European transportation corridor that links the Black and the Northern seas and is the most important inland navigable waterway in Europe. For this reason the coastal area close to the Danube Delta is subjected to high navigation traffic, which is crucially affected by the strong processes mainly induced by the interactions between the waves and the currents generated by the Danube River outflow. From this perspective, the objective of the present work is to develop a computational framework based on numerical models able to evaluate properly the effects of these interactions and to provide reliable predictions concerning the wave and current conditions corresponding to various environmental patterns. Following this target, a wave modelling system, SWAN based, was implemented in the entire basin of the Black Sea and focused on the coastal sector at the entrance of the Danube Delta. As a next step of the modelling process, SWAN simulations were performed at two different computational levels, considering in parallel the situations without and with the current fields for the main environmental conditions characteristic to the target area. The first level covers the entire coastal area at the mouths of the Danube River and has a resolution in the geographical space of 500m. The second is a computational domain with the resolution of 50m that is focused on the Sulina channel, which is the main navigation gate at the mouths of the Danube River. The results show that the presence of the currents induces relevant enhancements in terms of significant wave heights. Additionally, the Benjamin Feir index (BFI) was also evaluated. This is a spectral shape parameter that is related to the kurtosis of the distribution and indicates the risk of the freak wave occurrence. The enhanced values for BFI in the case when the current fields are considered in the modelling process

  12. A new species of Jainus (Monogenea, gill parasite of Schizodon borellii (Characiformes, Anostomidae from the upper Paraná river floodplain, Brazil - doi: 10.4025/actascibiolsci.v33i2.6168 A new species of Jainus (Monogenea, gill parasite of Schizodon borellii (Characiformes, Anostomidae from the upper Paraná river floodplain, Brazil - doi: 10.4025/actascibiolsci.v33i2.6168

    Directory of Open Access Journals (Sweden)

    Gilberto Cezar Pavanelli

    2011-05-01

    Full Text Available Jainus piava n. sp. is described from the gills of Schizodon borellii (Boulenger, 1900 (Characiform, commonly named as piava from the upper Paraná River floodplain, Brazil. The new species differs from the other members of Jainus in the following features: ventral bar thin broadly V-shaped and male copulatory organ (MCO a coil of about 1.5 rings. Jainus piava n. sp. is similar to species of Jainus by having a ventral anchor base with flattened superficial root and elongate rodlike deep root.Jainus piava n. sp. is described from the gills of Schizodon borellii (Boulenger, 1900 (Characiform, commonly named as piava from the upper Paraná River floodplain, Brazil. The new species differs from the other members of Jainus in the following features: ventral bar thin broadly V-shaped and male copulatory organ (MCO a coil of about 1.5 rings. Jainus piava n. sp. is similar to species of Jainus by having a ventral anchor base with flattened superficial root and elongate rodlike deep root.

  13. A conceptual model for groundwater - surface water interactions in the Darling River Floodplain, N.S.W., Australia

    Science.gov (United States)

    Brodie, R. S.; Lawrie, K.; Somerville, P.; Hostetler, S.; Magee, J.; Tan, K. P.; Clarke, J.

    2013-12-01

    Multiple lines of evidence were used to develop a conceptual model for interaction between the Darling River and associated floodplain aquifers in western New South Wales, Australia. Hydrostratigraphy and groundwater salinities were mapped using airborne electromagnetics (AEM), validated by sonic-core drilling. The AEM was highly effective in mapping groundwater freshening due to river leakage in discrete zones along the river corridor. These fresh resources occurred in both the unconfined Quaternary aquifers and the underlying, largely semi-confined Pliocene aquifers. The AEM was also fundamental to mapping the Blanchetown Clay aquitard which separates these two aquifer systems. Major-ion chemistry highlighted a mixing signature between river waters and groundwaters in both the Quaternary and Pliocene aquifers. Stable isotope data indicates that recharge to the key Pliocene aquifers is episodic and linked to high-flow flood events rather than river leakage being continuous. This was also evident when groundwater chemistry was compared with river chemistry under different flow conditions. Mapping of borehole levels showed groundwater mounding near the river, emphasising the regional significance of losing river conditions for both aquifer systems. Critically, rapid and significant groundwater level responses were measured during large flood events. In the Pliocene aquifers, continuation of rising trends after the flood peak receded confirms that this is an actual recharge response rather than hydraulic loading. The flow dependency of river leakage can be explained by the presence of mud veneers and mineral precipitates along the Darling River channel bank when river flows are low. During low flow conditions these act as impediments to river leakage. During floods, high flow velocities scour these deposits, revealing lateral-accretion surfaces in the shallow scroll plain sediments. This scouring allows lateral bank recharge to the shallow aquifer. During flood

  14. Exposure and vulnerability assessment of buildings extracted from lidar derived datasets in Bucao River floodplains, Zambales, Philippines

    Science.gov (United States)

    Paz-Alberto, Annie Melinda; Ramos, Gloria N.; Espiritu, Jo Adrianne; Mapanao, Kathrina M.; Lao, Ranilo B.

    2017-09-01

    The Philippines has a geographic and geological setting that make it prone to various hazards including weather and climate-related. It is usually strongly affected by monsoon and typhoon occurrences that cause floods due to torrential rains that causes great risks in man's life and properties, resulting in a significant national loss. Strategies for disaster prevention to protect human lives, properties and social infrastructure is therefore necessary. Different important parameters in disaster risk management such as earth observations, Light Detection and Ranging and Geographic Information System were integrated and utilized in this study. This study dealt with mapping and assessment of buildings that might possibly be exposed and vulnerable to flooding based on the simulated flood maps at different rainfall scenarios in Bucao River Basin. The assessment was done through GIS overlay analysis of the CLSU PHIL-LiDAR 1 Project outputs, the 3D building GIS database and flood hazard maps. Results of this study were series of maps with statistics at different rainfall scenarios. From 23,097 building features extracted, 10,118 buildings, 4,258 buildings and 7,433 buildings were the identified highest number of buildings exposed to flooding and a total of 2,427 buildings, 3,914 buildings and 7,204 buildings from the exposed were identified that had high vulnerabilities in terms of height at low, medium and high hazards of 100 year return period, respectively. Through these maps, it is easier to disseminate information that is more realistic to the residents about the hazardous areas and to help them act on warning and evacuating measures.

  15. Linking river, floodplain, and vadose zone hydrology to improve restoration of a coastal river affected by saltwater intrusion.

    Science.gov (United States)

    Kaplan, D; Muñoz-Carpena, R; Wan, Y; Hedgepeth, M; Zheng, F; Roberts, R; Rossmanith, R

    2010-01-01

    Floodplain forests provide unique ecological structure and function, which are often degraded or lost when watershed hydrology is modified. Restoration of damaged ecosystems requires an understanding of surface water, groundwater, and vadose (unsaturated) zone hydrology in the floodplain. Soil moisture and porewater salinity are of particular importance for seed germination and seedling survival in systems affected by saltwater intrusion but are difficult to monitor and often overlooked. This study contributes to the understanding of floodplain hydrology in one of the last bald cypress [Taxodium distichum (L.) Rich.] floodplain swamps in southeast Florida. We investigated soil moisture and porewater salinity dynamics in the floodplain of the Loxahatchee River, where reduced freshwater flow has led to saltwater intrusion and a transition to salt-tolerant, mangrove-dominated communities. Twenty-four dielectric probes measuring soil moisture and porewater salinity every 30 min were installed along two transects-one in an upstream, freshwater location and one in a downstream tidal area. Complemented by surface water, groundwater, and meteorological data, these unique 4-yr datasets quantified the spatial variability and temporal dynamics of vadose zone hydrology. Results showed that soil moisture can be closely predicted based on river stage and topographic elevation (overall Nash-Sutcliffe coefficient of efficiency = 0.83). Porewater salinity rarely exceeded tolerance thresholds (0.3125 S m(-1)) for bald cypress upstream but did so in some downstream areas. This provided an explanation for observed vegetation changes that both surface water and groundwater salinity failed to explain. The results offer a methodological and analytical framework for floodplain monitoring in locations where restoration success depends on vadose zone hydrology and provide relationships for evaluating proposed restoration and management scenarios for the Loxahatchee River.

  16. Education and Training Needs in the Field of Logistic Structures and Services in the Lower Danube Region

    Directory of Open Access Journals (Sweden)

    Mihai Felea

    2010-11-01

    Full Text Available The approach of the subject concerning the training of specialists in the domain of logistic structures and services in the region of the inferior Danube is enlisted within a larger context, the Strategy of the Danube, but also in a more restrained one, the Program of Cross-Border Cooperation Romania – Bulgaria, 2007-2013. The Strategy of the Danube represents a project initiated in the year 2008 by Germany, Austria and Romania to which subsequently there adhered the other states on the Danube and which became a program of the European Commission. It shall have allotted a budget of 50 milliards euro until the year 2013. It shall be preponderantly addressed to the population in the Danube Basin, which is estimated at 115 millions, following to be developed through cross-border projects. In December 2010 there is foreseen the approval of the Action Plan for the program the Strategy of the Danube by the European Commission. The integration process needs premises and conditions for further development. One of them is the connectivity and it supporting system – the logistics. The problem of the connectivity is one of the pillars of the Danube strategy, which could play an important role in the Lower Danube Macro region’s development. Those problems need different approaches, specialized research and training. The situation of the two countries in the domain of fluvial logistics may be characterized as unsatisfactory in relation to their potential. At the present moment there is a single bridge which connects the two countries (Giurgiu – Ruse and several travels with the passage boat. The harbour infrastructures are old and inefficient. There are no modern multi-modal platforms or a coherent vision in their design. The transportation on the Danube is insufficiently exploited. As well, the river is not capitalized in other domains, too: agriculture, pisciculture, energy, ecology, tourism, arrangement of the territory, etc. Within a more

  17. Strategic Planning for the Development of the Danube Area

    Directory of Open Access Journals (Sweden)

    ANTONIO VALENTIN TACHE

    2014-12-01

    Full Text Available The article includes concepts, information, methodologies of spatial planning focused on the Danube carried out within the European projects "Donauregionen" and "Donauregionen+", financed by the European Union through the South East Europe Transnational Cooperation Programme. The article proposes solutions for solving problems related to the opportunities offered by the Danube as an important corridor to support the economic growth and competitiveness of functional regions in the Danube area. The current situation in the Danube River riparian land-use planning policies involves (a creating the spatial concept of the Danube area interregional level, b developing integrated strategies to develop sectoral strategies embodied in the Danube area, the Transdanube strategy and development strategies for the Danube region as a whole. In this general scheme, indicators have been proposed, designed on four main areas (natural conditions, housing and human resources, technical infrastructure and transport, and economy. Based on the analyses conducted in the project, five Danube sub-regions and 19 Transdanube regions were established. Using the forecasting methodology proposed in the “Donauregionen+” project, three types of scenarios were developed for each sub-region: pessimistic, realistic and optimistic. All these scenarios have resulted in GIS cartograms, based on groups of territorial indicators that highlight the socio-economic development capacity of the Danube sub-regions.

  18. International joint research of the Danube radioactivity

    International Nuclear Information System (INIS)

    Szerbin, P.; Szabo, G.; Guczi, J.; Koblinger-Bokori, E.; Kurtacs, E.; Dovlete, C.; Ruzsa, G.; Major, V.; Maringer, F.J.

    1998-01-01

    A PHARE (Poland Hungary Aid for Reconstruction of Economy) subsidized study was initiated in 1995 with coordination of Vituki Innosystem (Hungary) and with participation of Austrian, Romanian, and Hungarian research institutes to reveal and investigate in detail hot spots of radioactivity and sources of contamination in the Danube catchment area. The general objective of the project was to assess whether or not potential upstream radionuclide sources in the countries in the upper part of the Danube basin have resulted in evidential downstream accumulation of radionuclides and have a potential impact into the Black sea contamination. The presentation summarizes the results of the international joint research study, and some other data obtained in the framework of cooperation between monitoring institutes of the riparian states

  19. THE RURAL TOURISM IN DANUBE DELTA

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    Ionica SOARE

    2014-06-01

    Full Text Available Purpose - the purpose of this paper is to evaluate the rural areas has market size and forecast its development as an economic activity. The present paper aims at analyzing the rural areas has in Danube Delta. In an enviable BAs which have responsibility for their particular isolated, such as the Danube Delta and the Danube that used, fishing and rural areas has the main activities that provide jobs and income sources for local populations. Design/methodology/approach - A survey was administered to customers’ rural hostel accommodation in Danube Delta. Descriptive statistics method was mainly adopted to calculate the mean with standard deviation of entry assumes variable, and to examine the different levels of consumers' awareness. The index values of product familiarity, the ratio between entries assumes product's familiarity value and the average value. Findings - the research results show hash has rural consumers have different perception and accomplished through behaviour. The information channels of brand hash mainly from friends, relatives and neighbours, so word of mouth spreading is very important for a brand. Women show a higher sensitivity in health and are currently operating the propensity than referred to follow the recommendations for nutrition. Research limitations/implications - This item is intended to synthesize developments and challenges," on June 13th rural market growth has. The results of this paper should be considered tentatively until has also features replicated by larger has rural consumers. Originality/value - members of rural areas has consumer's behavior would improve marketing and the development of rural areas has products, in order to reduce consumer confusion.

  20. Caloric density of aquatic macrophytes in different environments of the Baía river subsystem, upper Paraná river floodplain, Brazil

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    Célia de Almeida Lopes

    2006-09-01

    Full Text Available The aim of this work was to determine the caloric density of leaves, stems and roots of aquatic macrophytes in different environments of the Baía subsystem (Baía river and Fechada and Guaraná lagoons on the Upper Paraná river floodplain, in addition to identify the variability between ecological groups. Samplings of Eichhornia crassipes, Salvinia spp, Pistia stratiotes, Eichhornia azurea, Polygonum sp, Cyperaceae and Poaceae were carried out in February 2003. Spatial differences in the caloric densities were not observed for these plants. Caloric density values varied from 1906.9 cal/g dry weight (root to 4675.0 cal/g dry weight (leaf. However, significant differences between the caloric content averages of the vegetative structures were observed only for Polygonum sp and Salvinia spp. In relation to the ecological groups, the highest average value was verified for the emergent macrophytes (3529.7 ± 722.5, which were significantly different from the floating ones (3056.5 ± 571.0. There was no difference between the sites included in the subsystem when the caloric densities were compared.O presente trabalho teve por objetivo determinar a densidade calórica de folhas, caules e raízes de macrófitas aquáticas, em diferentes ambientes do subsistema Baía (Rio Baía e lagoas Fechada e do Guaraná na planície de inundação do alto rio Paraná, além de identificar a variabilidade entre grupos ecológicos. As amostragens foram realizadas em fevereiro de 2003, sendo coletadas amostras de diferentes macrófitas, Eichhornia crassipes, Salvinia spp, Pistia stratiotes, Eichhornia azurea, Polygonum sp, Cyperaceae e Poaceae. Diferenças espaciais nas densidades calóricas não foram observadas para as plantas estudadas. Os valores de densidade calórica variaram de 1906,9 cal/g de peso seco (raiz a 4675,0 cal/g de peso seco (folha. Entretanto, diferenças significativas entre as médias dos conteúdos calóricos das estruturas vegetativas foram

  1. Assessing Accessibility and Transport Infrastructure Inequities in Administrative Units in Serbia’s Danube Corridor Based on Multi-Criteria Analysis and Gis Mapping Tools

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    Ana VULEVIC

    2018-02-01

    Full Text Available The Danube Regions, especially the sub-national units of governance, must be ready to play an active role in spatial development policies. A precondition for this is good accessibility and the coordinated development of all transport systems in the Danube corridor. The main contribution of this paper is to provide a multi-criteria model for potential decision making related to the evaluation of transportation accessibility in Serbia’s Danube Corridor. Geographic Information Systems (GIS, based on maps, indicate the existing counties’ transport infrastructures inequities (between well-connected and isolated counties in terms of accessibility to central places. Through the research, relevant indicators have been identifi ed. This provides an outline of transportation perspectives regarding the development achieved and also fosters the increase of transportation accessibility in some peripheral Serbian Danube administrative units – counties (Nomenclature of Territorial Units for Statistics level 3 – NUTS 3.

  2. Development performances of agriculture in the Danube region countries

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    Gajić Milivoj

    2015-01-01

    Full Text Available In the recent decades, the Danube Region countries profile their policies towards a more efficient way of exploiting the natural resources of the Danube basin. The Danube can contribute to a better integration of the countries, enhancing economic opportunities through diversification and promotion of rural development. The trend analysis in the agricultural sector of the Danube Region countries refers to the first decade of this century, and it begins with the determination of the agricultural importance in the overall economy. The development performances of agriculture in the Danube Region countries are considered according to the production and export performances of this economic sector, using a comparative approach. The agricultural production growth, level and growth of the partial agricultural productivities - labour and land, as well as the value of exports in relation to engaged labour and agricultural land, are analysed in such a context.

  3. DONAUREGIONEN: The Spatial Development Concept of Interregional Cooperation in the Danube Space

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    OANA POPESCU

    2008-01-01

    that will act as a stabilization agent balancing the regional disparities in the different member countries.The Geographical information system supporting the elaboration of the Donauregionen project system was conceived as a working GIS storing all the geographical data necessary for the processing of project outputs. All the geographical data were distributed in the WGS-84 system of coordinates. The project area of interest includes a territory within 5 countries of the Danube region (Slovakia, Hungary, Serbia, Bulgaria, and Romania.

  4. The Danube - the Southern Border of Moldova. Historical Aspects

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    Ruslan Șevcenco

    2014-08-01

    Full Text Available For centuries the Danube was the southern border of Moldova. Moldova had the following ports: Chile, Izmail, Reni, Galati and others. This has contributed significantly to the economic development. Turkish authorities, becoming aware of the Danube immense importance at the trade, economic, and military-political level, partly conquered the Danube bay, which belonged to Moldova. In order to reduce the influence of Moldova, the Ottoman Empire created its own boundaries on this territory. Although divided into two (the east side was occupied by the Russian army, Moldova regained access on Danube at its previous borders, starting with the liquidation of the Turks domination. But in 1940 under the influence of Nikita Khrushchev, who had the position of first secretary of the Central Committee of the Communist Party (Bolshevik of Ukraine, the counties adjacent to the Danube - the territory between the Prut and Nistru - were transferred to Ukraine and its membership remained until the present days. The current authorities had managed to keep only a small segment of the Danube bay. In this article we will elucidate how for centuries the Moldovan authorities have struggled to maintain a part of the Danube's bay.

  5. Phytoplankton Assessment in Danube Delta Biosphere Reserve

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    SPIRIDON Cosmin

    2016-12-01

    Full Text Available The term ”plankton” refers to those microscopic aquatic forms having little or no resistance to currents and living free-floating and suspended, in open or pelagic waters. Phytoplankton development has different consequences depending on biomass quality and quantity, the overgrowth result being eutrophication process. The eutrophication intensity can cause both a lower water transparency, by excessive algal growth, to fish death in the area. In this study, it was presented the ecological status and phytoplankton biomass dynamic, in the Danube branches from upstream to downstream. The measurements have been made in 2013, in March, June, September and November, using spectrofluorometer for algal biomass determination and a microscope for qualitative analyses of phytoplankton species. Shannon-Wiener index was calculated to compare phytoplankton species diversity. Also, the biodegradable organic matter loading the ecosystem was determined by computing the Saprobic index. The values obtained do not exceed the eutrophication limits according to the Water Framework Directive, transposed into Romanian legislation by Order 161/2006, with normal concentrations for rheophile ecosystems, as Danube's branches. In this area, water currents and high water turbidity inhibit phytoplankton growth, in contrast to lacustrine ecosystems, where light penetration to depths favors the development of different phytoplankton groups.

  6. New approaches in European governance? Perspectives of stakeholders in the Danube macro-region

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    Franziska Sielker

    2016-01-01

    Full Text Available Macro-regional cooperation in the EU are networks that use the horizontal and vertical dimension of the multilevel governance system to influence both strategic decision-making as well as implementation activities. Drawing on an analysis of expert interviews in the Danube Region the paper scrutinizes stakeholders’ shared views towards expectations, challenges and added values, and thereby seeks to explain why a trend towards macro-regions arises and for what reasons stakeholders are getting involved. The analysis of the drivers for stakeholders’ commitment in the EU Danube Region Strategy shows that new governance arrangements need to be adjustable to different contexts, allow for negotiation and new network creation whilst simultaneously offering the political ability to act. The evidence presented suggests that multilevel governance in the EU is becoming increasingly complex, embracing more and different types of cooperation, with soft characteristics as crucial elements.

  7. Impact of Austrian hydropower plants on the flood control safety of the Hungarian Danube reach

    International Nuclear Information System (INIS)

    Zsuffa, I.

    1999-01-01

    Statistical analysis of daily water level data from four gauging stations along the Hungarian Danube reach has been carried out with the purpose of analysing the impact of the Austrian hydropower plants on the floods of the river. Conditional probability distribution functions of annual flood load maxima and annual number of floods were generated for the periods 1957-1976 and 1977-1996. By comparing these distribution functions, it could be shown that the flood load maxima have decreased, while the number of small and medium floods have increased during the past forty years. These changes indicate a decreased rate of flood superposition resulting from the barrages constructed in this period. The significantly decreased flood load maxima indicate that the Austrian barrage system has positive impact on the flood control safety of the Hungarian Danube reach

  8. Environmental monitoring of tritium risk along Romanian Danube sector

    International Nuclear Information System (INIS)

    Varlam, C.; Stefanescu, I.; Popescu, I.; Faurescu, I.; Dobrinescu, D.

    2009-01-01

    Danube basin covers the Romanian-Bulgarian sub-basin downstream of Cazane Gorge and the sub-basins of Siret and Prut rivers. Cernavoda Nuclear Power, operating a CANDU type reactor, is located in this region upstream Danube delta. Taking into account the future development of this important Romanian nuclear objective, the knowledge of the present status of tritium level becomes a necessity. Therefore, an extensive monitoring program for this radioisotope has been started along the Romanian sector of the Danube River basin, starting with Cazane Gorge and ending with Danube Delta. The tributaries from this sector: Cerna, Jiu, Olt, Arges rivers are included also in this seasonal monitoring. The average results of the seasonal variation for tritium level during 2006-2007 periods in 12 locations of mentioned areas are presented in the paper. (author)

  9. Biodiversity in the Yugoslav sector of the Danube

    International Nuclear Information System (INIS)

    Radovic, I.; Stevanovic, V.

    1997-01-01

    The historical as well as environmental aspects in the Yugoslav part of the Danube river region are reviewed. The attention of influence of the Djerdap gorge (hydro power constructions) is concerned. And particularly nowadays, perhaps more than ever, the man's activities jeopardize biodiversity of both the river and terrestrial ecosystems along the Danube, from plains of Vojvodina to magnificent mountains of the Djerdap gorge region

  10. Danube region strategy: Arguments for a territorial capital based multilevel approach

    Directory of Open Access Journals (Sweden)

    Giffinger Rudolf

    2010-01-01

    Full Text Available During the last months the discussion on a strategy for the Danube Region as a new approach for a European macro-region has been intensified, predominantly within the area of Central and South-Eastern Europe. Evidently the territory of the Danube Region is characterized by a divergent group of countries concerning the process of integration and the preconditions in geographic, economic, cultural and socio-demographic terms. Besides, the region’s spatial development shows divergent trends causing increasing regional disparities. Therefore, territorial cohesion - understood as intensified functional interrelations and strategic cooperation - is jeopardized in manifold ways. Hence, the main objective of this paper is to discuss the basic features of a strategy aiming at strengthening the polycentric development on different spatial levels. We start by assuming that the development of every city (as an element of the urban system depends on its territorial capital and relevant assets providing location based advantages regarding its competitiveness on different spatial levels. Therefore we uncover what we understand as assets driving urban development. In this context the meaning of polycentric development and the importance of polycentric structures as an asset of a city’s territorial capital is being revealed. Based on these conceptual considerations we examine some relevant features of the urban polycentric system in the Danube region and finally argue that a multilevel and evidence based approach should be evolved facing the differences in the preconditions and already existing assets of spatial development.

  11. Research regarding the reforestation with native forestry species of polders from the Lower Danube Valley and the Danube Delta

    Directory of Open Access Journals (Sweden)

    GREAVU Manole

    2011-09-01

    Full Text Available The Euro - American poplar and willow plantations have declined recently in the polders of Danube Delta due to the lessened level of underground water. This research was conducted in five precincts during 2005 -2009. Its aim was to observe the development of several native forestry species, such as the White Poplar, Black Poplar, Ash tree, Elm and Oak tree. These species are recommended for future cultivation in the polders of Danube Delta.

  12. A tracer test to determine a hydraulic connection between the Lauchert and Danube karst catchments (Swabian Alb, Germany)

    Science.gov (United States)

    Knöll, Paul; Scheytt, Traugott

    2018-03-01

    A dye tracer experiment was conducted between the rivers Lauchert and Danube near Sigmaringen (Swabian Alb, southern Germany). After a flood event in the River Lauchert, it was suspected that flood water infiltrated into the karst system and drained towards springs in the Danube Valley. A potential connection of the two rivers is provided by the margin of a tectonic graben crossing the valleys. The aim of the tracer experiment was to gain insight into the dominant groundwater flow direction as well as to study a possible preferential connection between the Lauchert surface catchment area and springs in the Danube Valley. After introducing sodium-fluorescein into the unsaturated zone, six springs in the Danube Valley and the River Lauchert itself were observed. Tracer breakthrough at three springs showed that these springs are fed by groundwater originating in the Lauchert surface catchment. Adjacent springs were not affected by the experiment, indicating a rather sharp divide between separate spring catchments. Analyses of tracer breakthrough curves suggest that springs with a tracer occurrence are fed by the same conduit system. It was possible to show that spring catchments in Sigmaringen reach significantly into the Lauchert surface catchment. As a consequence, a drinking-water supplier has changed its supply strategy. The results also help to explain significant differences between flood damage in the central and lower courses of the River Lauchert.

  13. Data on abiotic (nutrients and biotic (phytoplankton quality elements in Fortuna ecologically reconstructed area (Danube Delta Biosphere Reserve - Romania

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    TÖRÖK Liliana

    2013-12-01

    Full Text Available The impact of inorganic nutrient enrichment on reophillic ecosystems has been observed and intensively studied in many rivers. Due to the scarcity of information on ecological conditions in the channel-network of the Danube Delta it is very important to have reliable information on the trend of the abiotic and biotic quality elements in the Danube River and channel system – in order to fulfill the Water Framework Directive objectives and to implement the rehabilitation projects in area affected by nutrient pollution. The purpose of this paper is to present, analyze and discuss the results of evaluation of nutrient variation and phytoplankton quantification obtained in Fortuna area - one of the seven reconstructed areas of the Danube Delta Biosphere Reserve. In order to improve the quality of data on phytoplankton biomass distribution from Fortuna area, in the summer of 2008 there has been used a submersible spectrofluorometer with automatic algae class determination and chlorophyll analysis (bbe Fluoro Probe. According to the results of analyses on relation between phytoplankton communities and water-column, the phytoplankton development in the channel network of the Fortuna reconstructed area seems to be influenced mainly by nitrogen concentration than by phosphorus concentration, as in case of phytoplankton development in Danube Delta’s lakes

  14. The main factors of water pollution in Danube River basin

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    Carmen Gasparotti

    2014-05-01

    Full Text Available The paper proposed herewith aims to give an overview on the pollution along the Danube River. Water quality in Danube River basin (DRB is under a great pressure due to the diverse range of the human activities including large urban center, industrial, agriculture, transport and mining activities. The most important aspects of the water pollution are: organic, nutrient and microbial pollution, , hazardous substances, and hydro-morphological alteration. Analysis of the pressures on the Danube River showed that a large part of the Danube River is subject to multiple pressures and there are important risks for not reaching good ecological status and good chemical status of the water in the foreseeable future. In 2009, the evaluation based on the results of the Trans National Monitoring Network showed for the length of water bodies from the Danube River basin that 22% achieved good ecological status or ecological potential and 45% river water bodies achieved good chemical status. Another important issue is related to the policy of water pollution.

  15. The Intercultural Danube - a European Model

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    Gheorghe Lateș

    2014-08-01

    Full Text Available The EU construction began following the logic of economics, which in time it has created dysfunctions that seem to accentuate and create a quasi-general skepticism. This paper aims at analyzing the union construction and reconstruction on other conceptual premises, placing culture at the forefront of the new strategy. A multicultural Europe, based on the state primordial ethnicity is no longer current; the cultural diversity does not lead to unity, but rather it is a factor of dissolution. The Danubian model reunites races, languages and religions, being so diverse that their functional diachrony justifies the idea of reconstruction, based on what it was, and it did not generate tensions or conflicts. The ethnic identity did not become, in the Danube area, ethnicism, what it constitutes in a synchronic approach, as a model of rethinking the union, not by hierarchies, barriers, but rather by the opportunity of the coexistence of the peoples that connect history and the present of the horizontal axis River of a united Europe.

  16. Xanthophyceae planctônicas da planície de inundação do alto rio Paraná - DOI: 10.4025/actascibiolsci.v27i1.1353 Planktonic Xanthophyceae from upper Parana River floodplain - DOI: 10.4025/actascibiolsci.v27i1.1353

    Directory of Open Access Journals (Sweden)

    Sueli Train

    2005-03-01

    Full Text Available Existem poucos estudos abordando a biodiversidade fitoplanctônica em ambientes aquáticos de planície de inundação, o que sugere a necessidade de estudos taxonômicos visando à conservação e recuperação desses ecossistemas. A Classe Xanthophyceae foi estudada quanto à taxonomia e contribuição para a densidade e biomassa fitoplanctônica total. Foram analisadas amostras das regiões pelágica e litorânea de 33 ambientes da planície de inundação do alto rio Paraná, entre fevereiro de 2000 e fevereiro de 2001. As xantofíceas ocorreram em 61% dos biótopos, sendo identificados 20 táxons. Gloeobotrys lunatus Ettl, Goniochloris spinosa Pascher, Istmochloron neustonica Zalocar e Pizarro e Pseudostaurastrum limneticum (Borge Chodat constituíram primeira citação para esse sistema. O maior número de táxons ocorreu nos ambientes próximos ao rio Paraná, destacando-se a lagoa do Osmar. A contribuição de Xanthophyceae para a densidade e biomassa foi reduzida em todo o período estudado, sendo maior no período de águas altasThere are scarce studies concerning phytoplankton biodiversity in floodplain environment. This suggest the need of taxonomic studies for the conservation and recuperation of these ecosystems. Xanthophyceae was studied in relation to taxonomy and contribution to phytoplanktonic density and biomass. Samples were taken from limnetic and seaboard regions in 33 biotopes in the Upper Parana River floodplain, between February 2000 and February 2001. This group occurred in 61% of the biotopes and 20 species were registered. Gloeobotrys lunatus Ettl, Goniochloris spinosa Pascher, Istmochloron neustonica Zalocar and Pizarro and Pseudostaurastrum limneticum (Borge Chodat were considered first citation for this system. The highest number of taxa was registered in the biotopes near Parana River, especially in the Osmar Lagoon. The contribution of Xanthophyceae to density and biomass was low throughout the studied period and

  17. Avaliação da sustentabilidade agroambiental de unidades produtivas agroflorestais em várzeas flúvio marinhas de Cametá - Pará Agro-environmental sustainability evaluation of productive agroforestry units in tidal river floodplains Cametá Pará

    Directory of Open Access Journals (Sweden)

    Raimundo Nonato da Silveira Ribeiro

    2004-09-01

    Full Text Available O objetivo do trabalho é avaliar o potencial de sustentabilidade agroambiental de unidades produtivas agroflorestais ribeirinhas. A metodologia empregou técnicas de inventário florestal, coleta e análise laboratorial de solo, questionários, observações de campo e orçamentos unitários. As variáveis-indicadores são relativas ao clima, ao solo, a estrutura fitossociológica, ao potencial produtivo da agrofloresta e a geração de renda. Os resultados revelaram que o clima e o solo não são fatores limitantes. Cerca de 27 % da composição florística são espécies comerciais e somam mais de 92 % da população total com baixo potencial para a extração de madeiras e uma diversidade de produtos não-madeireiros. A renda bruta estimada atingiu valores de R$ 2.000,00/ha/ano. O potencial de sustentabilidade agroambiental das unidades produtivas é mediano, obtido pela avaliação das variáveis-indicadores por meio de um sistema de pontuação e inserção em um nível de sustentabilidade previamente proposto.The purpose of this paper is to evaluate the agro-environmental sustainability potential of productive agroforestry units in tidal river floodplains. The methodology employed forest inventory techniques, soil collection and laboratory analysis, questionnaires, field observations and budget sheets. The indicator variables are relative to climate, soils, sociological plant structure, agroforestry's productive potential and the generation of income. Results revealed that climate and soil are not limiting factors. Approximately 27% of the floristic composition is commercial species, making up over 92% of the total tree population having low timber extraction potential and a diversity of non-timber products. Estimated gross income reached sums of R$2,000.00/ha/year. The agro-environmental sustainability potential of the productive units is median and was measured by evaluating the indicator variables on a point system and placed within a

  18. The Judicial Regime of Danube Navigation between 1856- 1919

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    Constantin Tănase

    2015-08-01

    Full Text Available The basics of the judicial regime of Danube navigation, in the moern sens of the term, were inserted in the Peace Treaty in Paris, March 30, 1856, concluded at the end of Crimeea War. This judicial act of international law ended a situation in the area of the large European river where the rules were imposed by the big empires of Austria, Turkey and Russia, according to their interests. The rights and interests of the riverains such as the Romanian states, Serbia, Bulgari etc. were ignored and brutally violated. Until 1919, the European Danube Commission, institution created by the Paris Treaty, has contributed to the modernization of the lower Danube and development of navigation in this sector. This paper aims at clarifying to a certain extent the circumstances of the regulation of navigation during the reference period of time in this naval sector.

  19. Croatian-Hungarian cooperation on the Danube river radioactivity measurements

    International Nuclear Information System (INIS)

    Lulic, S.; Vancsura, P.

    2003-01-01

    Danube river radioactivity measurements on the border profile Mohac-Batina have been performed since the beginning of 1978 with varying frequency of sampling. Thus, in the period before nuclear power plant Paks started to work joint croatian-hungarian sampling at the border profile was taking place four times a year; the obtained results of measured radioactivity levels were used to assess radioactivity background data. From the start of nuclear power plant Paks running until Chernobyl reactor accident (April 1986) sampling was performed six times a year. After the Chernobyl accident, samples have been taken every month. Since decreased Chernobyl reactor accident influence was estimated until present samples have been taken six times a year. On the Danube river border profile the concentration activity of gamma radionuclides has been determined in water samples (filtered water and suspended matter), and in fish, sediment and Danube river algae samples. (authors)

  20. Analysis of the Danube river suspended load regime

    International Nuclear Information System (INIS)

    Lukac, M.

    2004-01-01

    In this presentation author deals with the analysis of the Danube river suspended load regime at the Slovak section of Danube. It is concluded and recommended: Suspended load transport at the Slovak section of Danube decreases in the downstream directions - annual averages: Utilize relation of the Water Research Institute in Medvedov, the relation of the Slovak Hydrometeorological Institute is probably slightly underestimated; Distribution of suspended load concentration in the cross-section is influenced mainly with local hydraulic and morphological conditions; Measured flow velocity in the range 0.6 - 2.65 m/sec -1 , influenced with water level slope; Silt particles the most numerous, less numerous sandy and clayey particles; Bratislava 3.54 mil. tonnes, Medvedov 2.22 mil. tonnes, and Komarno 1.96 mil. tonnes; Recommendation to measure actual volume of the Cunovo reservoir, in order to validate sediment transport balance; Recommendation to continue in a complex monitoring programme of sediment transport

  1. Real time flood forecasting in the Upper Danube basin

    Directory of Open Access Journals (Sweden)

    Nester Thomas

    2016-12-01

    Full Text Available This paper reports on experience with developing the flood forecasting model for the Upper Danube basin and its operational use since 2006. The model system consists of hydrological and hydrodynamic components, and involves precipitation forecasts. The model parameters were estimated based on the dominant processes concept. Runoff data are assimilated in real time to update modelled soil moisture. An analysis of the model performance indicates 88% of the snow cover in the basin to be modelled correctly on more than 80% of the days. Runoff forecasting errors decrease with catchment area and increase with forecast lead time. The forecast ensemble spread is shown to be a meaningful indicator of the forecast uncertainty. During the 2013 flood, there was a tendency for the precipitation forecasts to underestimate event precipitation and for the runoff model to overestimate runoff generation which resulted in, overall, rather accurate runoff forecasts. It is suggested that the human forecaster plays an essential role in interpreting the model results and, if needed, adjusting them before issuing the forecasts to the general public.

  2. Upper Caraş River (Danube watershed fish populations fragmentation – technical rehabilitation proposal

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    Voicu Răzvan

    2018-01-01

    Full Text Available We propose a technical solution for fish movement based on the flow of water over a spill threshold. Such barriers are common in the Danube system. The proposed system has a range of operating components which are easily detachable from the spill threshold, are resistant to corrosion and will not harm the fish. In fact, if designed to complement swimming abilities of target fish, it should provide adequate passage for both adults and juveniles. If implemented correctly, the design may offer a solution to help displaced fish recolonize upstream habitats.

  3. On the radio-ecology of the Danube

    International Nuclear Information System (INIS)

    Huebel, K.

    1984-01-01

    The ecological parameters and an estimate of the effects of radiation exposure as a result of the peaceful utilization of nuclear energy on the population in the Danube area are discussed. All possible paths of exposure are to be taken into consideration: swimming, boating, staying in sediment (external exposure), use of drinking water, consumption of fish, meat, milk and plants (internal exposure)

  4. Perinatal health in the Danube region - new birth cohort justified.

    Czech Academy of Sciences Publication Activity Database

    Knudsen, L. E.; Andersen, Z.J.; Šrám, Radim; Braun Kohlová, M.; Gurzau, E.S.; Fucic, A.; Gribaldo, L.; Rössner ml., Pavel; Rössnerová, Andrea; Máca, V.; Zvěřinová, I.; Gajdošová, D.; Moshammer, H.; Rudnai, P.; Ščasný, M.

    2017-01-01

    Roč. 32, 1-2 (2017), s. 9-14 ISSN 2191-0308 Institutional support: RVO:68378041 Keywords : birth cohort * child health * Danube region * environmental exposures Subject RIV: DN - Health Impact of the Environment Quality OBOR OECD: Public and environmental health

  5. Long-term tritium monitoring to study river basin dynamics: case of the Danube River basin

    Science.gov (United States)

    Aggarwal, Pradeep; Araguas, Luis; Groening, Manfred; Newman, Brent; Kurttas, Turker; Papesch, Wolfgang; Rank, Dieter; Suckow, Axel; Vitvar, Tomas

    2010-05-01

    During the last five decades, isotope concentrations (O-18, D, tritium) have been extensively measured in precipitation, surface- and ground-waters to derive information on residence times of water in aquifers and rivers, recharge processes, and groundwater dynamics. The unique properties of the isotopes of the water molecule as tracers are especially useful for understanding the retention of water in river basins, which is a key parameter for assessing water resources availability, addressing quality issues, investigating interconnections between surface- and ground-waters, and for predicting possible hydrological shifts related to human activities and climate change. Detailed information of the spatial and temporal changes of isotope contents in precipitation at a global scale was one of the initial aims of the Global Network of Isotopes in Precipitation (GNIP), which has provided a detailed chronicle of tritium and stable isotope contents in precipitation since the 1960s. Accurate information of tritium contents resulting of the thermonuclear atmospheric tests in the 1950s and 1960s is available in GNIP for stations distributed world-wide. Use of this dataset for hydrological dating or as an indicator of recent recharge has been extensive in shallow groundwaters. However, its use has been more limited in surface waters, due to the absence of specific monitoring programmes of tritium and stable isotopes in rivers, lakes and other surface water bodies. The IAEA has recently been compiling new and archival isotope data measured in groundwaters, rivers, lakes and other water bodies as part of its web based Water Isotope System for Data Analysis, Visualization and Electronic Retrieval (WISER). Recent additions to the Global Network of Isotopes in Rivers (GNIR) contained within WISER now make detailed studies in rivers possible. For this study, we are re-examining residence time estimates for the Danube in central Europe. Tritium data are available in GNIR from 15

  6. Cernavoda NPP Unit 1: Ensuring heat sink at very low Danube river levels

    International Nuclear Information System (INIS)

    Urjan, D.

    2005-01-01

    Full text: On August 24, 2003 the summer heat wave has caused the Danube River to drop to its lowest level in more than a century, forcing a government commission of experts and a team of technical specialists from Cernavoda NPP to close Romania's unique nuclear reactor in operation at Cernavoda. The paper presents some of the required actions needed for plant shutdown and ensuring adequate fuel cooling at very low suction bay levels, due to the Danube River level drop (Danube waters cools the reactor). The water level in the Danube River at Cernavoda village, where the reactor is located, fell to a depth of less than three meters (10 feet) on Saturday, down from its usual level of almost seven meters (23 feet). Consequently, the Unit 1 nuclear power plant was shut down Sunday due to this record drought, which left insufficient water to cool down the reactor. Operating Instruction procedures were elaborated in order to provide a logical sequence of actions when the bay level decreases under 2.25 m, or the estimated level after 3 days will be lower than 1.8 m. When Raw Service Water (RSW) is lost, Recirculated Cooling Water (RCW) will remain in service only for Moderator, ESC, HT Pumps, HT Purification, D/C Cooler, LAC's, and D 2 O Feed Pump. Alternate water sources, like potable water and water from the fire protection system were taken in consideration in order to ensure heat sink to the RCW loads. At the same time, in case of total loss of Class III and Class IV Power, and Stand-By Diesel Generators unavailable because of the loss of heat sink provided by the RSW, Emergency Power System (EPS) was configured to supply directly the Class III Power 6 kV bus (BUG bus). Economical Impact According to a report, closing the nuclear plant costs Romania $500,000 a day. The total cost includes also losses due to a 40 percent reduction in hydroelectric power generation due to reduced river flow. The country had to cease power exports until the reactor comes back on line

  7. Network-based Modeling of Mesoscale Catchments - The Hydrology Perspective of Glowa-danube

    Science.gov (United States)

    Ludwig, R.; Escher-Vetter, H.; Hennicker, R.; Mauser, W.; Niemeyer, S.; Reichstein, M.; Tenhunen, J.

    Within the GLOWA initiative of the German Ministry for Research and Educa- tion (BMBF), the project GLOWA-Danube is funded to establish a transdisciplinary network-based decision support tool for water related issues in the Upper Danube wa- tershed. It aims to develop and validate integration techniques, integrated models and integrated monitoring procedures and to implement them in the network-based De- cision Support System DANUBIA. An accurate description of processes involved in energy, water and matter fluxes and turnovers requires an intense collaboration and exchange of water related expertise of different scientific disciplines. DANUBIA is conceived as a distributed expert network and is developed on the basis of re-useable, refineable, and documented sub-models. In order to synthesize a common understand- ing between the project partners, a standardized notation of parameters and functions and a platform-independent structure of computational methods and interfaces has been established using the Unified Modeling Language UML. DANUBIA is object- oriented, spatially distributed and raster-based at its core. It applies the concept of "proxels" (Process Pixel) as its basic object, which has different dimensions depend- ing on the viewing scale and connects to its environment through fluxes. The presented study excerpts the hydrological view point of GLOWA-Danube, its approach of model coupling and network based communication (using the Remote Method Invocation RMI), the object-oriented technology to simulate physical processes and interactions at the land surface and the methodology to treat the issue of spatial and temporal scal- ing in large, heterogeneous catchments. The mechanisms applied to communicate data and model parameters across the typical discipline borders will be demonstrated from the perspective of a land-surface object, which comprises the capabilities of interde- pendent expert models for snowmelt, soil water movement, runoff formation, plant

  8. DETERMINATION OF WATER RESOURCES IN RIVERS IN THE BULGARIAN BASINS OF THE LOWER DANUBE

    Directory of Open Access Journals (Sweden)

    Plamen Iliev Ninov

    2017-04-01

    Full Text Available Object of the study is surface water bodies from category “rivers” according to Water Framework Directive 2000/60/ЕС. Surface water assessment is important for number of activities such as: water management in the country, making reports to international agencies, determining the change of the resources in the light of upcoming climate changes. The determination of water resources is based on information of hydrometric stations from the monitoring network system in the National Institute of Meteorology and Hydrology — Bulgarian Academy of Sciences (NIMH-BAS in which real ongoing and available water flows that are subject of management are registered. In the study a technology for surface water bodies in the Bulgarian basins of the lower Danube is applied which has been developed in the frame of cooperative project together with the Ministry of Environment and Water. This is absolutely true for the Bulgarian section of the Danube River basin which is expressed in big number and variety of hydrological homogeneous sections. The river flow is characterized with annual and inter-annual variability determined by climatic factors and anthropogenic influences. The main obtained results of the present hydrologic studies are the usage of transferred information from gauged to ungauged watersheds and the estimation of the surface water bodies’ resources using original regression relationships based on multiannual hydrological information from the NIMH-BAS monitoring network. The relationships delineate the hydrological homogeneous areas with similar conditions of flow formation. The estimated resources have significant usefulness for all State institutions managing the water in the Danube basin and have already been introduced in the operative and management practice.

  9. Vascular flora of the Upper Paraná River floodplain Flora vascular da planície de inundação do Alto Rio Paraná

    Directory of Open Access Journals (Sweden)

    MC. Souza

    2009-06-01

    Full Text Available The purpose of this study was to update the floristic inventory found in the Upper Paraná River floodplain. Floristic surveys were performed from February 2000 through March 2008, as part of the Brazilian Long-Term Ecological Research Program (PELD/CNPq -Site 6. The material collected was identified from 774 species, 442 genera, and 116 families. The ten families with high species richness were Leguminosae, Poaceae, Rubiaceae, Asteraceae, Euphorbiaceae, Myrtaceae, Cyperaceae, Solanaceae, Sapindaceae, and Orchidaceae, which contributed to 46.1% of the total number of species. Genera with high richness were Solanum, Cyperus, Panicum, Eugenia, Tillandsia, Serjania, Casearia, and Polygonum, which together contributed to 10.2% of the total number of species. These data, combined with information published in 1997, recorded 955 species, 575 genera, and 128 families. These organisms were from several riparian environments and were distributed as herbs, shrubs, trees, climbers and epiphytes. Panicum maximum, Pennisetum purpureum, Ricinus communis, and Urochloa decumbens are considered weeds due to the wide distributions determined for these species. The results presented herein suggest the need to further investigate the control of these potential weed species.Com o objetivo de ampliar os conhecimentos sobre a flora da planície de inundação do Alto Rio Paraná, foram conduzidos inventários florísticos no período de fevereiro de 2000 a março de 2008, incluídos no Programa Brasileiro de Pesquisas Ecológicas de Longa Duração (PELD/CNPq - Sítio 6. O material coletado foi identificado em 774 espécies, 442 gêneros e 116 famílias. As dez famílias de maior riqueza de espécies foram Leguminosae, Poaceae, Rubiaceae, Asteraceae, Euphorbiaceae, Myrtaceae, Cyperaceae, Solanaceae, Sapindaceae e Orchidaceae, que juntas reuniram 46,1% do total do número de espécies. Os gêneros com maior riqueza de espécies foram Solanum, Cyperus, Panicum, Eugenia

  10. Feeding and morphological analysis of the digestive tract of four species of fish (Astyanax altiparanae, Parauchenipterus galeatus, Serrasalmus marginatus and Hoplias aff. malabaricus from the upper Paraná River floodplain, Brazil

    Directory of Open Access Journals (Sweden)

    D. Peretti

    Full Text Available The present study is inspired by the great wealth of species exhibited by the ichthiofauna. Not only concepts and techniques of ecology deserve attention, but also knowledge in other biological areas, such as zoology and anatomy, are necessary. The intention of the present work is to discover the morphology of fish through the study of the digestive tract morphology, associating it to diet data, in order to better understand the biology of four fish species of the upper Paraná River floodplain. The samples were collected quarterly in the year 2000 with gillnets of different meshes. The stomach content was analyzed under a stereoscopic microscope and the frequencies of occurrence (FO and volumetric (FV and the alimentary index (IAi were calculated. Various morphologic characteristics were analyzed and schematized using a light chamber. The species were grouped into two trophic guilds - insectivores (Astyanax altiparanae and Parauchenipterus galeatus and piscivores (Serrasalmus marginatus and Hoplias aff. malabaricus. The first two, although consumers of insects, preyed on different alimentary groups, notably Hymenoptera in the case of A. altiparanae and Coleoptera in the case of P. galeatus. Serrasalmus marginatus and H. aff. malabaricus consumed mainly fishes. However, only pieces of prey were usually found in the stomach content of the first species, whereas whole fishes were found in the stomach content of the second. Astyanax altiparanae exhibited characteristics that allowed it to obtain food in several compartments of the water column. Similarly P. galeatus consumed food resources that were available in all aquatic compartments, although the abilities to capture, to manipulate and to absorb food differed, as shown by the importance of teeth plates and pharyngeal teeth. Serrasalmus marginatus and H. aff. malabaricus, although resembling each other in many aspects of the digestive tract morphology, differed in the strategies used to capture

  11. The Danube Region Protection – Challenges for Green Marketing and Corporate Social Responsibility in Serbia

    Directory of Open Access Journals (Sweden)

    Jelena Stanković

    2015-08-01

    Full Text Available During past years the influence of climate changes on environmental factors, such as water, soil, and air, has become significant and pretty unavoidable. Based on that, anthropogenic influences like industrial, communal, and agricultural wastewater discharge, have become more dangerous for the eco-system as a whole. In this paper we will analyse the possibilities for reducing antropogenic influences through the processes of controlling and monitoring of the wastewater as well as the Danube river water-gang. The European Union Framework Directive has been implemented into the legislative system of the Republic of Serbia, with the purpose of more complete protection of the Danube Region. In that sense, the prevention of the drinking water deficit requires a multidisciplinary approach, which includes activities on green marketing and a higher level of corporate social responsibility. Water, in all its aspects, has a strong economic value, which is the reason why it has to be recognized as an economic resource as well as a highly influential factor of local community development. Integrated management system of wastewater has to be established on the overall cooperation among consumers, planners, and policy designers at all levels – local, regional and global.

  12. INAA of microelements in plant species from the Danube floodplain

    Energy Technology Data Exchange (ETDEWEB)

    Pantelica, A; Salagean, M; Scarlat, A [Department of Applie Physics, Horia Hulubei National Institute for Physics and Nuclear Engineering, PO Box MG-6, RO-76900 Magurele-Bucharest (Romania); Iordache, V [Department of Ecology, University of Bucharest, Bucharest (Romania)

    1999-07-01

    A research was developed and implemented in the Danube floodplain, as a part of a program dealing with biogeochemistry of metals, to assess the possibility of using the ubiquitous plant species in the soil pollution monitoring activity. The Danube River is heavily polluted by the input from a catchment, which includes 12 countries. Even if the concentrations in the Danube water and sediments reach acute values only in some hot spots, due to the dilution effect, they could have negative consequences by phenomena of bioaccumulation and bioconcentration. The content of Al, Ag, As, Au, Ba, Br, Ca, Cl, Ce, Co, Cr, Cs, Cu, Eu, Fe, Hg, Hf, K, La, Mg, Mn, Na, Ni, Rb, Sc, Se, Sm, Sr, Th, V and Zn in Bidens tripartita, Rubus caesius, Stachys palustris and Xanthium strumarium ubiquitous plant species, collected from two areas located on different regularly flooded islands of the Danube river was investigated by instrumental neutron activation analysis method at WWR-S reactor in Bucharest. From the statistical point of view, three groups of elements present highly correlated concentrations in the investigated plant samples (p(0.05))//. The first one includes Al, As, Ce, Cs, Eu, Fe, Hf, La, Sc, Sm, Th and V, the second one Au, Ca, Cu and Sr, and the third one Br, Cr, Na and Mn. For the elements of the first group, the elemental concentrations are found to be in similar ratios in the species investigated, namely: Xanthium s. < Rubus c. < Bidens t. < Stachys p. as well as for the third group: Bidens t. < Rubus c. < Stachys p. < Xanthium s, suggesting that physiological features of the species could be responsible for the observed patterns of distribution. The soil and dominating plant species were analysed for Cr, Cu, Fe, Mn, Ni, Pb, Zn and Zr by the X-ray fluorescence method at the Institute for Geological Explorations, Bucharest. The elemental content in soil is reflected in the analysed plants for Cr, Cu, Fe, Ni, Pb and Zn, but not for Mn. This could be explained by the redox

  13. INAA of microelements in plant species from the Danube floodplain

    International Nuclear Information System (INIS)

    Pantelica, A.; Salagean, M.; Scarlat, A.; Iordache, V.

    1999-01-01

    A research was developed and implemented in the Danube floodplain, as a part of a program dealing with biogeochemistry of metals, to assess the possibility of using the ubiquitous plant species in the soil pollution monitoring activity. The Danube River is heavily polluted by the input from a catchment, which includes 12 countries. Even if the concentrations in the Danube water and sediments reach acute values only in some hot spots, due to the dilution effect, they could have negative consequences by phenomena of bioaccumulation and bioconcentration. The content of Al, Ag, As, Au, Ba, Br, Ca, Cl, Ce, Co, Cr, Cs, Cu, Eu, Fe, Hg, Hf, K, La, Mg, Mn, Na, Ni, Rb, Sc, Se, Sm, Sr, Th, V and Zn in Bidens tripartita, Rubus caesius, Stachys palustris and Xanthium strumarium ubiquitous plant species, collected from two areas located on different regularly flooded islands of the Danube river was investigated by instrumental neutron activation analysis method at WWR-S reactor in Bucharest. From the statistical point of view, three groups of elements present highly correlated concentrations in the investigated plant samples (p(0.05))//. The first one includes Al, As, Ce, Cs, Eu, Fe, Hf, La, Sc, Sm, Th and V, the second one Au, Ca, Cu and Sr, and the third one Br, Cr, Na and Mn. For the elements of the first group, the elemental concentrations are found to be in similar ratios in the species investigated, namely: Xanthium s. < Rubus c. < Bidens t. < Stachys p. as well as for the third group: Bidens t. < Rubus c. < Stachys p. < Xanthium s, suggesting that physiological features of the species could be responsible for the observed patterns of distribution. The soil and dominating plant species were analysed for Cr, Cu, Fe, Mn, Ni, Pb, Zn and Zr by the X-ray fluorescence method at the Institute for Geological Explorations, Bucharest. The elemental content in soil is reflected in the analysed plants for Cr, Cu, Fe, Ni, Pb and Zn, but not for Mn. This could be explained by the redox

  14. Bio politics - The bio-environment - bio-culture of the Danube

    International Nuclear Information System (INIS)

    Vlavianos-Arvanitis, A.

    1997-01-01

    The bio-environment has been the single most important correlation in human history and can successfully promote international co-operational co-operation and understanding. With the construction of a network for collaboration, the 'Danube Countries' can come together in celebration of their culture and heritage. As the Danube flows from the Black Forest to the Black Sea, it carries messages of peace, hope and co-operation. Applying these messages to every endeavour can improve our quality of life and lead to a brighter future. Since its inception in 1985, the Bio politics International Organization (B.I.O.) has been labouring to raise awareness of the urgent need to instate a new system of norms and principles, compatible with sound environmental management and with the most important task of ensuring global literacy on environmental issues. Along with critically re-assessing the concept of profit, the goal is to adopt a system of bio centric values, where respect for the bio-environment will govern our every action and thought

  15. FLOOD MODELING OF THE VUKA RIVER SECTION UPSTREAM OF ITS CONFLUENCE WITH THE DANUBE RIVER

    Directory of Open Access Journals (Sweden)

    Dario Marić

    2016-12-01

    Full Text Available In this paper, a section of the Vuka River from its confluence with the Danube River in Vukovar to 3 + 630 rkm was modeled. The possibility and size of floods in the surrounding area were analyzed for different return periods (2, 5, 10, 50, and 100 yrs. Although the high-water levels of the Danube River are lower than the terrain elevation of Vukovar, they cause backwater in the Vuka River and in its tributary, the Bobotski canal. In that indirect way, the surrounding area is endangered and the efficiency of drainage systems is reduced. The existing riverbed of the analyzed Vuka River section was digitalized based on a digital terrain model using the geographic information system (GIS software ArcGIS and the HEC-GeoRAS toolbar. A mathematical model of the steady-state flow of the Vuka river section using the digitized riverbed was executed in the HEC-RAS software using different return periods. The obtained velocities and water levels were analyzed using HEC-RAS, and the sizes of the flooded areas were calculated and observed in ArcGIS.

  16. Environmental influences on the composition and structure of the freshwater mussels in shallow lakes in the Cuiabá River floodplain

    Directory of Open Access Journals (Sweden)

    AC. Colle

    Full Text Available The maintenance of the freshwater mussels' community in lakes is determined by abiotic factors at the local scale and at regional scale by interspecific relations between the larvae of bivalves and fish host. Whereas the distribution pattern at local scale, our goal was to understand the abundance and community composition of bivalves and relate the environmental agents structuring this community. We sampled 20 lakes in the floodplain of the Cuiabá River using a standardized method of sampling. To evaluate the effect of environment on the community we applied multivariate inferential analyses. We found 1.143 individuals alive belonging into six species distributed at the family Hyriidae, Mycetopodidae, Sphaeridae and Corbiculidae. The results showed that in the Pantanal the bivalve assemblage structure is influenced locally by organic matter and particle size, variables that reflect the intense interactions between water-sediment. However it is important to emphasize that these environmental characteristics are the result of the dynamics of this system which is dependent on the flood pulse, a regional factor.

  17. Climate Change and water resources: Scenarios of low-flow conditions in the Upper Danube River Basin

    International Nuclear Information System (INIS)

    Mauser, W; Marke, T; Stoeber, S

    2008-01-01

    Global Climate Change will have regional impacts on the water resources and will force water resources managers and farmers to adapt. Both low-flow and its duration are critical hydrological parameters, which strongly influence the state of aquatic ecosystems as well as power production, reservoir management and industry. Impacts of future climate change is analysed using scenarios for the change of meteorological drivers and regional hydrological simulation models. The project GLOWA-Danube (www.glowa-danube.de) develops integrative modelling techniques combining process knowledge from both natural and social sciences to examine the sustainability of regional water systems as well as water management alternatives in the Upper Danube watershed (A = 77000 km 2 ). Special emphasis is given to changes in low-flow condition. DANUBIA describes the regional water cycle both physical and spatially distributed. It consists of a collection of tightly coupled models, which strictly preserve energy and matter and are not calibrated to maximise their overall predictive abilities. The paper demonstrates that DANUBIA can reproduce the daily discharge for the time period from 1971-2003 with a Nash-Suttcliffe coefficient of 0.84 (gauge Achleiten). Based on a statistical climate simulator 12 realisations of the IPCC A1B climate scenario were used to investigate impacts of climate change during the simulation period of 2011-2060. The change in discharge and frequency of occurrences of low-flow in the watershed for the scenario ensemble were analysed for the outlet gauge. The analysis shows that strong changes were simulated in the frequency of occurrences of low-flow conditions. The changing climate gradually reduces a 50-years NM7Q discharge of today to less than half of its discharge in the year 2060. These results clearly indicate that the expected climate change will strongly alter the low-flow conditions in the Upper Danube watershed.

  18. Social Media Interactions and Online Games - Building up New Human Relationships in Danube Region

    Directory of Open Access Journals (Sweden)

    Predrag K Nikolić

    2015-08-01

    Full Text Available In this paper we are trying to explore possibilities of using online environment, multiplayer gaming culture and social media networks to engage people in the Danube Region around social, multi-cultural and environment initiatives. The Danube Region online community could become a new cultural phenomena, technology mediated, built on human interactions, common interests and cultural heritage which open space for future humancentered social and infrastructural design initiatives. We believe that such social media environment could also be a research playground where people form Danube Region may express their needs and desires as well as to leave the trace of their behavior, significant for further Danube Region development.

  19. Cross-Country Entrepreneurial Intentions Study: The Danube Region Perspective

    Directory of Open Access Journals (Sweden)

    Urban Šebjan

    2016-12-01

    Full Text Available In this article, we investigate how entrepreneurial intentions of individuals in the eight countries of the Danube region are shaped by different components of individuals’ personal attitudes, the subjective norm and personal behavioral control. We analyze the internal structure of these components as well as some demographic and human capital factors. Cultural and developmental differences influencing variation in causal effects among variables in the model are analyzed. Structural equation modeling is used for data obtained by adult population surveys within the GEM research. Results of our study show that the entrepreneurial intention model is applicable across countries and that the internal effects among components of motivational antecedents exist, although not all hypothesized relationships are confirmed. Our study suggests that the process from perception to intention is similarly shaped across the eight countries of the Danube region, although there are several differences in the magnitude of causal effects as well as differences regarding influential factors.

  20. Hydrologic Variability of the Cosumnes River Floodplain

    Directory of Open Access Journals (Sweden)

    Eric Booth

    2006-09-01

    Full Text Available Natural floodplain ecosystems are adapted to highly variable hydrologic regimes, which include periodic droughts, infrequent large floods, and relatively frequent periods of inundation. To more effectively manage water resources and maintain ecosystem services provided by floodplains – and associated aquatic, riparian, and wetland habitats – requires an understanding of seasonal and inter-annual hydrologic variability of floodplains. The Cosumnes River, the largest river on the west-slope Sierra Nevada mountains without a major dam, provides a pertinent test case to develop a systematic classification of hydrologic variability. By examining the dynamics of its relatively natural flow regime, and a 98-year streamflow record (1908 – 2005, we identified 12 potential flood types. We identified four duration thresholds, defined as short (S, medium (M, long (L, and very long (V. We then intersected the flood duration division by three magnitude classes, defined as small-medium (1, large (2, and very large (3. Of the 12 possible flood types created by this classification matrix, the Cosumnes River streamflow record populated 10 such classes. To assess the robustness of our classification, we employed discriminant analysis to test class fidelity based on independent measures of flood capability, such as start date. Lastly, we used hierarchical divisive clustering to classify water years by flood type composition resulting in 8 water year types. The results of this work highlight the significant seasonal and inter-annual variability in natural flood regimes in Central Valley rivers. The construction of water impoundment and flood control structures has significantly altered all aspects of the flood pulse. Restoring floodplain ecosystem services will require re-establishing key elements of these historic flood regimes in order to achieve regional restoration goals and objectives.

  1. Establishing oaks in Big River floodplains

    Science.gov (United States)

    Dan Dey; John Kabrick; Michael Gold

    2003-01-01

    Successful tree establishment is fundamental to implementing agroforestry practices, reforesting bottomland cropfields or regenerating green-tree reservoirs. Planting trees can be problematic in floodplains and riparian areas because of intense competition from herbaceous and woody plants, animal herbivory and browsing, and flooding and saturated soils.

  2. Study of inland fisheries from Danube Delta - Romania

    Directory of Open Access Journals (Sweden)

    CERNISENCU Irina

    2007-10-01

    Full Text Available The average commercial fish catch decreased from about 12000 tons (1967 year, in Danube Delta lakes to around 3000 tons in the last years. In this period piscivorous species like pike, wels catfish, european perch declined and the non-piscivorous species like gibel carp, bream, roach and white bream became dominant. According with the last years state of the fish stocks its estimated that in Danube Delta lakes a sustainable yield of about 6000 tons could be fished. The administration of the stocks on the durable principles and implementation of the correct strategy it decisively depends on the quality data concerning the catch size. The lack or unreliable records led to the underestimation or overestimation of some parameters with negative results about the current state and theexploitation of the stocks. The essential error source in stock estimation of lake Complexes is represented by the unrecorded catches of the legal family subsistence quota, black markets and poaching. The real data is very important for accurate assessment of the fish stock. Improvement of the quality of the catch statistics and monitoring of fishing effort are required for sustainable management of Danube delta fisheries.

  3. Data on macrofungal diversity from the Danube Delta iosphere Reserve

    Directory of Open Access Journals (Sweden)

    SZASZ Balazs

    2017-12-01

    Full Text Available Despite de fact that the Danube Delta has a great biodiversity with more than 2300 plants and more than 4000 animals registered (http://www.ddbra.ro/rezervatia/deltadunarii/biodiversitate, the study of macromycetes is rather scanty, and the number of macromycetes species found so far in the Reserve is 58. As a result of the mycological investigations done by the authors in 2016 May 7-8 and October 21-22 in the Danube Delta Biosphere Reserve in the Letea Forest, Caraorman Forest and at the forest district’s former premises near C.A. Rosetti, the list of the recorded 130 species is presented, out of which 110 species are documented for the first time in the Danube Delta Biosphere Reserve (DDBR. The number of the macrofungi species that occur in the formentioned Reserve - including the buffer zone from Enisala - has grown to 168. Based on the red list of the romanian macromycetes (Tănase and Pop, 2005 we have found three species in the near threatened category (NT: Helvella acetabulum, Morchella esculenta and Pluteus petasatus, and one species in the vulnerable category (VU: Myriostoma coliforme. A short survey from 1932 to 2012 about the former mycological studies concerning the DDBR is presented, and the nomenclaturally updated list of the 38 species not found by us, but present in the DDBR is given.

  4. Implementation of Ecological Policies in Danube Delta Area

    Directory of Open Access Journals (Sweden)

    Trifon Belacurencu

    2007-04-01

    Full Text Available Public authorities and the local community have become lately increasingly aware of the complex relationship between the environment and the economic activity and of the need for integrating environmental requirements into economic activities. Therefore, a strategy that aims at a sustained development which takes into account the environmental aspects is imperative. Environmental policies represent a set of measures and tools with the objective of controlling and limiting the process of deterioration of environment quality. The design of environmental policies for the Danube Delta is not an easy task, due primarily to the major changes that affect the deltaic ecosystem, the patterns of behavior and consumption, poverty and isolation of the local communities, etc. The environmental policies in the Danube Delta have no longer an auxiliary role, rather reactive, but instead they are meant to set objectives at the economic, legal, educational and social levels and to guide the strategy for their achievement. In this paper I have outlined both the objectives of the environmental policies and the types of measures (general, direct and indirect for their implementation in the area of the Danube Delta.

  5. Measurement of tritium in the Sava and Danube Rivers.

    Science.gov (United States)

    Grahek, Željko; Breznik, Borut; Stojković, Ivana; Coha, Ivana; Nikolov, Jovana; Todorović, Nataša

    2016-10-01

    Two nuclear power plants (NPP), the KrškoNPP (Slovenia) on the Sava River and the Paks NPP (Hungary) on the Danube River, are located in the immediate vicinity of Croatia and Serbia. Some of the radioactivity monitoring around the NPPs involves measuring tritium activity in the waters of rivers and wells. The authors present the tritium measurement results taken over several years from the Sava and Danube Rivers, and groundwater. The measurements were carried out in two laboratories including an impact assessment of the tritium released into the rivers and groundwater. The routine methods for determining tritium (with/without electrolytic enrichment) were tested in two laboratories using two different instruments, a Tri-Carb 3180 and Quantulus 1220. Detection limits for routine measurements were calculated in compliance with ISO 11929 and Currie relations, and subsequently the results were compared with those determined experimentally. This has shown that tritium can be reliably determined within a reasonable period of time when its activity is close to the calculated detection limit. The Krško NPP discharged 62 TBq of tritium into the River Sava over a period of 6 years (23% of permitted activity, 45 TBq per year). The natural level of tritium in the Sava River and groundwater is 0.3-1 Bq/l and increases when discharges exceed 1 TBq per month. Usually, the average monthly activity in the Sava River and groundwater is maintained at a natural level. The maximum measured activity was 16 Bq/l in the Sava River and 9.5 Bq/l in groundwater directly linked to the river. In the majority of water samples from the Danube River, measured tritium activity ranged between 1 and 2 Bq/l. The increased tritium levels in the Danube River are more evident than in the Sava River because tritium activity above 1.5 Bq/l appears more frequently on the Danube River. All measured values were far below the allowed tritium limit in drinking water. Dose assessment has shown that

  6. Multiannual runoff variability in the upper Danube region

    International Nuclear Information System (INIS)

    Pekarova, P.

    2009-05-01

    The development of mankind has depended on availability of water resources. Already the first agricultural civilizations noticed the temporal variability of water resources and oscillation of the multi-annual dry and wet periods. The presented thesis summarizes results of more than fifteen years research activities of the author in the field of long-term runoff prediction. Statistical analysis of the runoff oscillations depends on availability of long time series of data. Systematic measurements of discharge in modern era started relatively late. The longest time series are available in Europe, but they do not exceed 200 years. Such long series are exceptional and in most parts of the world only much shorter series exist. Since studies dealing with the natural runoff oscillation and NAO phenomenon recently absent in Slovakia, there is the one aim of the thesis to fill in the gap in the long-term runoff fluctuation analysis and long-term discharge prediction methods development. The thesis focuses on the natural runoff cyclicity identification. In stochastic models, the climate changes scenarios caused by atmosphere warming are not involved however the runoff tele-connection around the Earth is studied. Scientific objectives of the thesis: 1. To reconstruct the Danube daily discharge series at Bratislava (1876-1890) based upon the Bratislava gauge daily water level observations; 2. to analyze variability and long term trends of the selected discharge Danube series characteristics for its Bratislava gauge; 3. to propose and develop the combined periodogram method for more exact spectral density identification in discharge time series; to analyze trends and periodicity in discharge long term series; to identify occurrence of the wet and dry periods over the world, to identify the influence of the NAO/AO/ENSO/QBO phenomena and the Sun activity on the runoff variability. 4. to present some long term stochastic prediction methods; to use two of them, the classical

  7. The 87Sr/86Sr aquatic isoscape of the Danube catchment from the source to the mouth as tool for studying fish migrations

    Science.gov (United States)

    Zitek, Andreas; Tchaikovsky, Anastassiya; Irrgeher, Johanna; Waidbacher, Herwig; Prohaska, Thomas

    2014-05-01

    Isoscapes - spatially distributed isotope patterns across landscapes - are increasingly used as important basis for ecological studies. The natural variation of the isotopic abundances in a studied area bears the potential to be used as natural tracer for studying e.g. migrations of animals or prey-predator relations. The 87Sr/86Sr ratio is one important tracer, since it is known to provide a direct relation of biological samples to geologically distinct regions, as Sr isotopes are incorporated into living tissues as a proxy for calcium and taken up from the environment without any significant fractionation. Although until now the focus has been mainly set on terrestrial systems, maps for aquatic systems are increasingly being established. Here we present the first 87Sr/86Sr aquatic isoscape of the Danube catchment, the second largest river catchment in Europe, from near its source starting at river km 2581 in Germany down to its mouth to river km 107 in Romania. The total length of the river Danube is 2780 km draining a catchment area 801 463 km2 (10 % of the European continent). The major purpose of this study was to assess the potential of the 87Sr/86Sr isotope ratio to be used as tool for studying fish migrations at different scales in the entire Danube catchment. Within the Joint Danube Research 3 (JDS 3), the biggest scientific multi-disciplinary river expedition of the World in 2013 aiming at the assessment of the ecological status and degree of human alterations along the river Danube, water samples were taken at 68 pre-defined sites along the course of the river Danube including the major tributaries as a basis to create the so called 'Isoscape of the Danube catchment'. The determination of 87Sr/86Sr isotope ratio in river water was performed by multicollector-sector field-inductively coupled plasma-mass spectrometry (MC-SF-ICP-MS). The JDS 3 data were combined with existing data from prior studies conducted within the Austrian part of the Danube catchment

  8. Messages of invasive Perccottus glenii individuals eaten by an Esox lucius from the Danube Delta

    OpenAIRE

    Ilie Cătălin Telcean; Alfred-Stefan Cicort-Lucaciu

    2016-01-01

    In the stomach of a pike from the Danube Delta we have found seven Perccottus glenii individuals. Their message indicated that in the Danube Delta P. glenii has already large population. Also, it proves that in its habitats, the pike can consume numerous individuals of this invasive species. Their gut contents prove that P. glenii hunted near the shores, ingesting numerous terrestrial preys.

  9. Danube Soya – Improving European GM-free soya supply for food and feed

    Directory of Open Access Journals (Sweden)

    Krön Matthias

    2015-09-01

    Full Text Available The Danube Soya Association is an international, voluntary, non-profit, non-governmental association promoting sustainable and GMO**-free soya production along the Danube River Basin – from Switzerland to the Black Sea. Founded in 2012 the association counts today more than 200 members from the whole value chain and civil society in 16 European countries. The members share the vision of a protein transition towards more European and more sustainable protein sources for food and feed. The Danube Area is an area of large potential agricultural surpluses and Danube Soya promotes the idea of using these surpluses to replace a part of the imported soya. The goals of the association are to increase value-added in the rural economies of Central Eastern Europe, promote European cooperation as well as a production of constant and sustainable local soya sources. The Danube Soya Association runs a certification scheme that reaches from soya seeds all the way to final products, which can be labelled with the consumer label “Fed with Danube Soya” (for animal products and “Danube Soya” (for soya food products. Together with its partners, the Danube Soya Association implements and supports dissemination and research projects on different topics.

  10. Ecological estimation of the possible variants new Ukrainian shipping way between the Danube and the Black Sea

    Science.gov (United States)

    Berlinsky, N.

    2007-05-01

    The better way or optimal variant means economic advisability of organization and using the way and the same time minimization of anthropogenic press. The first problem's factor is - all kinds' variants cross the area of the Danube Biosphere Reserve. The next factor is - all kinds of variants need dredging works in the sea shallow water so called bar's zone for marine entrance channel. As for natural factors there are also two. The first one is a long term delta evolution and the second is the process of water discharge redistribution. If the human influence to the first factor is still limited the second factor's influence can be unlimited - it is easy to do by jetty or dams construction. At present there are nine possible variants of the DWW: Variant 1. It is an artificial canal built as an ameliorative at 80-s between the Danube and Sasik liman. It provokes the water discharge redistribution up on 16.6% from the Danube run off (from the total Q=3000 m3/c for 54 km), hydrological regime in Ukrainian delta and ecological conditions will be sharply worsened. This project supposed a giant dredging works. Variant 2. The Project of engineer P.S. Chekhovich (1904). The length of the canal is 10 km. (The problems are: it is an artificial canal, needs the bridge, cross the wetlands area, redistribute water discharge from the Danube). Variant 3. Solomonov branch - Zhebryany bay modern Project by engineer V.P. Zizak (2000), The problems are: it is an artificial canal also, but with locks, needs the bridge, to cross the wetlands area, the water discharge redistribution from the Danube up on 2.27% (from the total Q=3000 m3/c for 54 km). The length of the canal is 9 km. Two last variants have orientation from Solomonov arm to Zhebriany bay. The other variants of DWW linked with Ochakovsky and Starostambulsky arms systems. Ochakosky system is dying off system from geological point of view. There are two arms which can be examined for DWW - Prorva arm and Potapovo arm. Besides

  11. The Great Diversion: Danube Delta under Human Control (Invited)

    Science.gov (United States)

    Giosan, L.

    2009-12-01

    Many deltas around the world are suffering from sediment deficits that render them unstable to current and predicted rates of sea level rise. One solution proposed to alleviate the complete or partial drowning of such deltas is the use of river diversions to increase the quantity of sediment supplied to the delta plain to support marsh accretion. We examine the results of a half century old program of diversion in the Danube delta that led to the creation of an extensive diversion channel network akin in scope and size to a natural deltaic network. Danube’s importance as a shipping route increased after the Crimean War in the 1850s; the European Danube Commission was charged with maintaining the Sulina distributary as a shipping channel until 1940s. In the same period, several canals were dug to aid fishing in lakes and bring freshwater to brackish lagoons. After World War II, Communist authorities dramatically increased the number of canals for fishing, fish-farming and reed harvesting. New data on sedimentation rates and estimates of sediment fluxes suggest that the intensive canalization in the second half of the 20th Century led to increased sediment deposition that compensated the decreasing sediment discharge linked to damming within the internal fluvial part of the delta; however, the external marine delta has become increasingly sediment starved during the same interval. We emphasize the similarities and contrasts between the “human-controlled” and natural deltaic channel networks of the Danube delta and discuss the sustainability of the delta as a sediment budget problem within a sea level rise context.

  12. Gross beta activity of the Danube river samples in 2006

    International Nuclear Information System (INIS)

    Tanaskovic, I.; Pantelic, G.; Eremic-Savkovic, M.; Vuletic, V.; Javorina, Lj.; Tanaskovic, I.)

    2007-01-01

    Our paper presents the results of radioactivity control of the Danube samples on Serbian (Bezdan left coast) in 2006. The measurements were carried out by low-phone proportional gas alpha beta counter PIC-WPC-9550. Efficiency for activity was 47%. The results of measurements of gross beta activity (water, sediment, algae and fish) reveal that the values are at the same level as they were before the Paks Nuclear power plant started running. Our results of measurements correlate well with the results of Hungarian part. (author) [sr

  13. ANTHROPIC IMPACT ON AIR QUALITY IN THE DANUBE REGION

    Directory of Open Access Journals (Sweden)

    VOINA A.

    2016-07-01

    Full Text Available There were monitored by data acquisition both in summer and winter period, the concentrations of pollutants - SO2, NO2 and particulate matter (PM10 – existing in air on the territory of 6 counties bordering the Danube. After processing and analysis of collected data have been found that: SO2 pollution may be due primarily burning fuel with high sulfur content and / or industrial activities for carbonic products (anodes for obtaining the electrolytic aluminum, graphite electrodes etc.; pollution with NO2 comes primarily from automobile exhaust gases; particulate matter pollution may be due both loess soil (high winds in dry periods characteristic of the area i

  14. The River Danube: An Examination of Navigation on the River

    Science.gov (United States)

    Cooper, R. W.

    One of the definitions of Navigation that gets little attention in this Institute is (Oxford English Dictionary), and which our French friends call La Navigation. I have always found this subject fascinating, and have previously navigated the Rivers Mekong, Irrawaddy, Hooghly, Indus, Shatt-al-Arab, Savannah and RhMainKanal (RMDK) and the River Danube, a distance of approximately 4000 km. This voyage has only recently become possible with the opening of the connecting RMDK at the end of 1992, but has been made little use of because of the civil war in the former Yugoslavia.

  15. What fish and how many there are in Danube Delta?

    Directory of Open Access Journals (Sweden)

    NĂVODARU Ion

    2011-09-01

    Full Text Available The real figure of fish fauna and fishery of the Danube delta is difficult to be estimated due to the limitation in fish sampling and underreporting of catch. This paper proposes to compare output of fish sampling with commercial catch statistics. Fish fauna from Danube delta complex lakes was sampled in 2006-2008 period and catchstatistics represent a long time series data recording. For fish sampling was used two complementary methods: electric fishing for shallow border zone and Nordic gillnet fishing for deep open water. The frequency of occurrence and the dominance in abundance analysis was based on 267 samples including 57158 individuals from both sampling methods since the dominance in biomass was based on 640 kg of fish only from gillnet sampling. In total was sampled 40 fish species, while catch statistics recorded 10 commercial species plus more 3 categories that include more other different species. In the sampling analysis, the most frequent species (very frequent were perch, bleak, roach, rudd and white bream. The most abundant(eudominant and dominant species were bleak, roach, rudd, perch, and white bream. In biomass dominate (eudominant and dominant roach, rudd, perch, white bream, bleak, gibel carp and pike. This analysis shows that Danube delta lakes are dominate by small eurytopic and opportunistic species, favoured by eutrophication of lakes. However, this figure is expression of sampling methods that are limited in estimation of real fish population status. Nevertheless, when this structure is compared to commercial statistics, it is noticed completely other figure. The difference in fish structure may be explained by targeting fishing to large size and high market value fish species. It is not neglected that commercial statistics is deformed by unreported catch sold on black market. According with recorded statistics from 1920 until 2010 the catch trend continuously decrease and species composition was well balanced before

  16. 25th Conference on Robotics in Alpe-Adria-Danube Region

    CERN Document Server

    Borangiu, Theodor

    2017-01-01

    This book presents the proceedings of the 25th International Conference on Robotics in Alpe-Adria-Danube Region, RAAD 2016 held in Belgrade, Serbia, on June 30th–July 2nd, 2016. In keeping with the tradition of the event, RAAD 2016 covered all the important areas of research and innovation in new robot designs and intelligent robot control, with papers including Intelligent robot motion control; Robot vision and sensory processing; Novel design of robot manipulators and grippers; Robot applications in manufacturing and services; Autonomous systems, humanoid and walking robots; Human–robot interaction and collaboration; Cognitive robots and emotional intelligence; Medical, human-assistive robots and prosthetic design; Robots in construction and arts, and Evolution, education, legal and social issues of robotics. For the first time in RAAD history, the themes cloud robots, legal and ethical issues in robotics as well as robots in arts were included in the technical program. The book is a valuable resource f...

  17. Electricity supply for remote places in the Danube Delta using non-conventional sources of energy

    International Nuclear Information System (INIS)

    Zaides, E.P.

    1993-06-01

    The results of the theoretical studies and experiments performed by the author during the last years, the testing of the technical solutions based on PV and wind turbines, are the premises which allow the start of a new project regarding the electricity supply for remote places in the Danube Delta using non-conventional sources of energy. The aim of the project is to supply electricity to remote places such as: schools, medical centers, telecommunications, data logging equipment for floods preventing. The technical solutions envisage the design of a hybrid systems based on PVs and WTs. The paper emphasizes the elements of progress, the general concept of the design and is looking forward to raise the interest of other research teams which might take part into such project. (author). 7 refs, 11 figs, 3 tabs

  18. The Danube, the Leading Actor of European Identity

    Directory of Open Access Journals (Sweden)

    Florin Iftode

    2016-08-01

    Full Text Available The regional policy is a strategic investment policy, which aims at stimulating the economic growth of all EU regions and cities and to improve quality of life. It is also an expression of solidarity, as it focuses on helping the less developed regions. The Regional policy aimed at EU regions and cities, stimulating the economic growth and improving the quality of life through strategic investments. It is also an active form of solidarity, which targets to support the less developed regions. Regional policy benefits from the biggest part of the EU budget for 2014-2020 (351.8 billion Euros out of a total of 1082 billion and is therefore the main investment instrument of the Union. With an area of about 800,000 km (occupying one fifth of the EU's area and with a population of over 100 million, the Danube Region is vital for Europe. Danube basin has a number of advantages that can enable the development of its rapid geographical position (opening to the east; cultural, ethnic and natural; sources of renewable energy (hydro, biomass, wind and thermal; benefits related to the environment (flora and fauna, water resources, Delta.

  19. Cruising along the river Danube: Contemporary tourism trend in Serbia

    Directory of Open Access Journals (Sweden)

    Dragin Aleksandra S.

    2010-01-01

    Full Text Available The subject of this paper are international cruises along the Pan-European Corridor VII (Danube Waterway. We tried to identify the structural properties of cruises along the Corridor VII, determine the scope and dynamics of cruises along the Corridor VII, define the problems and point to perspectives of cruises along the Corridor VII in Serbia. The research presented in this paper suggests that adequate valorization of the Danube along its entire naviga­ble stream is a 'quick win' option for Serbia's tourism. The related research, also, suggests positive effects that the cruises have upon the economic and socio-cultural development of Serbia. In order for cruises along the Corridor VII to provide prosperity in the forthcoming period, it is necessary that this form of tourism be integrated into plans of tourism development of the entire Corridor VII and Serbia as a whole. Without adequate plans, the recon­struction of the existing and new infrastructure and increase in service quality, it is reasonable to expect a decline in the competitiveness of the Serbia's supply at the cruise market. The basic methods used while obtaining and processing data and analyzing the results are: field research, histor­ical method, statistical procession, quantitative and qualitative content analyses, comparative method (Bench­mark analysis etc.. A particular significance was given to the PESTEL analysis.

  20. The Orthoptera species (Insecta from Danube Delta Biosphere Reserve (Romania

    Directory of Open Access Journals (Sweden)

    LUPU Gabriel

    2012-09-01

    Full Text Available The investigations that were made in the last 10 years and the review of scientific literature who relived studies made on grasshoppers, cricket and bush cricket species from Romania and especially from Danube Delta Biosphere Reserve (D.D.B.R. territory indicate the presence of 80 taxa belonging to Orthoptera order (ClassInsecta, an important number from a total of 187 taxa at national level. In the same time D.D.B.R. is characterized by some interesting elements of orthoptera fauna – one endemic species [Isophya dobrogensis (Kis 1994] on Popina Island, one new species for this territory [Metrioptera (Zeuneriana amplipennis (Brunner von Wattenwyl, 1882] and two species (Isophya dobrogensis (Kis, 1994 and Saga pedo (Pallas, 1771 from Red List of plant and animal species from D.D.B.R. Over 40% orthoptera species from Romania characterize through their presence Danube Delta Biosphere Reserve having a diverse geographical spreading, fact that is correlated with the diversity of dobroudjean climate. This is characterized by unique elements in Romania being an interface area between different types of climate.

  1. Preliminary Data on the Ecological Requirements of the Invasive Spiny-Cheek Crayfish in the Lower Danube

    Directory of Open Access Journals (Sweden)

    Pîrvu Mălina

    2014-12-01

    Full Text Available Water quality and properties of the riverbed often shape the community structure of aquatic ecosystems, occasionally sustaining the expansion of non-native species. This study aims to provide preliminary data on the ecological preferences of the invasive species Orconectes limosus, its control, and the protection of the native stock is an European priority. In order to assess the species ability to colonize small river systems, relevant tributaries in the invaded Danube sector were monitored. Statistical test indicates a preference for deep and warm rivers, low water velocity and also high concentrations of calcium.

  2. Pollution sources and groundwater quality in the Coastal region of the Yugoslav part of the Danube

    International Nuclear Information System (INIS)

    Komatina, S.

    1997-01-01

    In order to access the vulnerability and risk of the aquifer system in the Yugoslav part of the Danube, as the primary source of drinking water for a numerically substantial community, industrial purposes and irrigation, as well as a high concentration of civil, industrial and agricultural activities (hence, a potential source of pollution of the groundwater resources through land occupation and use as well as the disposal of solid and liquid wastes), a great hydro-geophysical exploration was performed. Within the lower part of the plain, exploratory test of Salinac field, near Smederevo town, was particularly investigated. The reason why is because that part is also an area of the mouth of the Velika Morava into the Danube, where Derdap reservoir is located. Task of complex exploration was to delineate the aquifer, obtain appropriate parameters (groundwater level, groundwater chemistry, clay content, filtration characteristics and physical parameters of geological functions), as well as to map the aquifer vulnerability, in order to prevent and moderate a harmful influence of the performed reservoir on the environment (increased groundwater infiltration from the reservoir into surrounding rocks, permanent groundwater level raising, etc.). Based on the results, zoning of the study area according to the aquifer vulnerability has been done. Then, land-use planning and development of strategy for groundwater protection and management was possible. In the paper, not only sources of contamination, characteristics of pollutants and their influence on the groundwater quality was presented, but also content of organic matters, phosphates and nitrogen compounds, etc. Further, means of protection and management are discussed, as well as the appropriate legal regulations. (author)

  3. Soil seed bank during succession at an abandoned pasture in the upper Paraná river-floodplain, Brazil - doi: 10.4025/actascibiolsci.v33i1.6391 Soil seed bank during succession at an abandoned pasture in the upper Paraná river-floodplain, Brazil - doi: 10.4025/actascibiolsci.v33i1.6391

    Directory of Open Access Journals (Sweden)

    João Batista Campos

    2011-02-01

    Full Text Available We evaluated density and species composition of the soil seed bank in active pasture and in secondary forest on a 10 year-old abandoned pasture to identify changes in density, richness, diversity and species composition during secondary succession of abandoned pastures. The implications of those changes for the forest recovery process were also considered. Soil samples were collected at Porto Rico island, state of Paraná, in 2007. The seedling emergence method was used. Data on active pasture collected in 1996, published by Campos and Souza (2003 were used for comparative analysis. No evidence was found of a pattern of changes in density of the soil seed bank during succession of abandoned pastures. We observed increases in richness and diversity, in the contribution of tree and shrub species and dominance of herb species for the seed bank during the first 10 years of abandonment of pastures in riparian forests. At the end of succession, the soil used as pasture can result in systems that are different from the original environment, due to seed bank impoverishment and presence of exotic species.We evaluated density and species composition of the soil seed bank in active pasture and in secondary forest on a 10 year-old abandoned pasture to identify changes in density, richness, diversity and species composition during secondary succession of abandoned pastures. The implications of those changes for the forest recovery process were also considered. Soil samples were collected at Porto Rico island, state of Paraná, in 2007. The seedling emergence method was used. Data on active pasture collected in 1996, published by Campos and Souza (2003 were used for comparative analysis. No evidence was found of a pattern of changes in density of the soil seed bank during succession of abandoned pastures. We observed increases in richness and diversity, in the contribution of tree and shrub species and dominance of herb species for the seed bank during the

  4. Media-Competence as Precondition of the Students’ Intercultural Competence Formation of the Danube Region

    Directory of Open Access Journals (Sweden)

    Anastasia Hrekova

    2015-08-01

    Full Text Available The unity of Europe, including countries of the Danube region, takes into account a variety of national cultures. One of the priority tasks of European society development is the mutual enrichment of intellectual values and at the same time national identity preservation. The article deals with the role of media-education of the effective cooperation development of ethnic cultures. Media literacy is analyzed as a precondition for the formation of intercultural competence of student youth from the Lower Danube Region. The mechanisms of adequate perception formation of cultural differences through the students’ media-competence education of the Danube region are under analysis.

  5. The Lower Danube River-Danube Delta-North West Black Sea: A pivotal area of major interest for the past, present and future of its fish fauna--A short review.

    Science.gov (United States)

    Bănăduc, Doru; Rey, Sonia; Trichkova, Teodora; Lenhardt, Mirjana; Curtean-Bănăduc, Angela

    2016-03-01

    The complex Danube-Black Sea geoecosystem, created by a unique combination of integrated biotopes and biocoenoses related forces and counter-forces in time and space, forms a rich "ichthyosystem". The equilibrium among the fish species captured in the Danube Delta reveals its structural and functional roles in the connectivity of the Danube and Black Sea. The key role of the delta is evidenced by the fact that 57.26% of the Lower Danube-Danube Delta-North West Black Sea fish species use two or three of the subsystems in terms of habitats. Therefore, this convergence area can be considered to be a dynamic and rich "ichthyosystem", with three subsystems. All three evolved interdependently, which permits their flexibility and adaptation in an interdependent way. The habitat heterogeneity, native economic and conservation priority fish species of the Lower Danube-Danube Delta-North Western Black Sea have decreased significantly, and there are no indications that this trend will be halted soon. The Danube "sub-ichtyosystem" seems to be more directly affected than the others. The Lower Danube-Danube Delta-North Western Black Sea "ichthyosystem" exhibits a significant level of flexibility, resilience and adaptation over geological time, but has become much more sensitive to environmental perturbations due to the last century of human impact. This "ichthyosystem" is affected by non-native fish species. The study area represents an interdependent ecological net, without which the specific "ichthyosystem" formed over geological time will disappear. The studied ecological net fish fauna is an accurate indicator of various human pressures. The Lower Danube-Danube Delta-North West Black Sea geoecosystem, in which the Danube Delta provides the pivotal habitat element, is the matrix for a unique "ichthyosystem." However, human impacts decrease its resilience and can induce its extinction. Copyright © 2015 Elsevier B.V. All rights reserved.

  6. The influence of the geomorphological factors on the relief modelling within Eselnita hydrographic basin (Danube catchment/Romania

    Directory of Open Access Journals (Sweden)

    DANIELA VLAD

    2012-08-01

    Full Text Available Developed on the south-eastern side of Almãjului Mountains, Eşelniţa drainage basin neighbours upon the following basins: upon S – SV with Mala, upon SV - V with Mraconia, upon V – NV with Berzasca, upon NV - NNE with Nera and on the NNE – SE direction with Cerna. The basin has a surface of 77 km2 and present a 5th degree hydrographic network according to Horton-Strahler ranking system, tributary to Danube by means of Eşelniţa main collector. Developed in a mountain landscape, the basin presents different levels held between minimum altitude of 64 m at the confluence with the Danube and maximum altitude of 1107 m, thus presenting a difference of 1043 m. Geological formations within the basin belong predominant to the Danubian Domain, so in central and upper courses, these are represented by a crystalline foundation and by magmatic rocks of intrusive nature covered by very small areas of sediment located in the northwest (belong to the Lower Jurassic and in the south-eastern (belongs to the Upper Cretaceous of the basin. But in the lower course, there are both crystalline and the sedimentary formations, last being integrated to Orşova depression and whose presence is related to the evolution of the Danube. Morphometric indices of Eşelniţa basin allows the distinction of a higher sector, mountainous terrain with high energy under a relatively increased fragmentation and depression sector with low relief energy and also with an intense fragmentation of the existing sedimentary rocks wich favors erosion manifestation in the context of deforestation action.

  7. Interpretations and Implementation of the Regulations on the Protection of Danube Delta Biosphere Reserve

    Directory of Open Access Journals (Sweden)

    Dorin Matei

    2015-08-01

    Full Text Available The Danube Delta Biosphere Reserve, part of the UNESCO world patrimony since 1992, enjoys an enhanced legislative protection regarding the protection of fauna and flora. In Romania we find the legislation in the field of traffic regulations on ships and boats on the Danube, on canals and inland lakes in the Danube Delta area, and in fisheries and protection of animals and plants. The state of the environment in the Danube Delta Biosphere Reserve is constantly analyzed, achieving annual public reports. The aim of the paper is the interpretation of legal provisions both in the field, making proposals de lege ferenda for the smooth running of traffic and environmental protection in the Delta.

  8. Sustainable planning and tourism development policy exemplified by medieval fortresses along the river Danube

    Directory of Open Access Journals (Sweden)

    Belij Srđan

    2014-01-01

    Full Text Available The coastal area of the Danube had the greatest strategic importance in the preservation of the waterway, which was the most important road in this part of Europe until the late 19th century. On the banks of the Danube were located the cradle of many civilizations that were built by European values and identities created by different people. As a natural border Danube has played a significant role in military strategy in the struggle for supremacy and domination of European territories, which are the most significant and most monumental fortress in Serbia, built right on the banks of the Danube. Cultural Route „Fortresses on the Danube“, which floats our sector of the Danube, displays our most important monuments of military architecture in this part of Serbia, the preserved remains of seven fortresses: Bač, Petrovaradin, Belgrade, Smederevo, Ram, Golubačka and Fetislam. Mentioned fortress are an important resource for sustainable tourism development and an important part of the cultural corridor not only in Serbia, but also South-Eastern Europe, which value is recognized by UNESCO. A special segment of the tourism industry in the development of the Danube region represents the development of geotourism as tourism specific niche markets Danube fortresses, and other objects of natural and cultural heritage of the Danube basin is recognized as an interesting tourist destinations and sites worth visiting and retention during a cruise on the Danube. Protection of cultural heritage as a unique and irreplaceable wealth, is very important for the Republic of Serbia and the Danube Region. The development of „cultural routes“ and other forms of cluster connectivity properties of cultural heritage will help better interpretation of heritage and the creation of cooperative networks that will provide obtaining the status of an important heritage resource in the development of cultural tourism and to be involved in politics purposeful tourism

  9. Danube Soya – Improving European GM-free soya supply for food and feed

    OpenAIRE

    Krön Matthias; Bittner Ursula

    2015-01-01

    The Danube Soya Association is an international, voluntary, non-profit, non-governmental association promoting sustainable and GMO**-free soya production along the Danube River Basin – from Switzerland to the Black Sea. Founded in 2012 the association counts today more than 200 members from the whole value chain and civil society in 16 European countries. The members share the vision of a protein transition towards more European...

  10. Messages of invasive Perccottus glenii individuals eaten by an Esox lucius from the Danube Delta

    Directory of Open Access Journals (Sweden)

    Ilie Cătălin Telcean

    2016-12-01

    Full Text Available In the stomach of a pike from the Danube Delta we have found seven Perccottus glenii individuals. Their message indicated that in the Danube Delta P. glenii has already large population. Also, it proves that in its habitats, the pike can consume numerous individuals of this invasive species. Their gut contents prove that P. glenii hunted near the shores, ingesting numerous terrestrial preys.

  11. Long-term monitoring of the Danube river-Sampling techniques, radionuclide metrology and radioecological assessment

    International Nuclear Information System (INIS)

    Maringer, F.J.; Gruber, V.; Hrachowitz, M.; Baumgartner, A.; Weilner, S.; Seidel, C.

    2009-01-01

    Sampling techniques and radiometric methods, developed and applied in a comprehensive radioecological study of the Danube River are presented. Results and radiometric data of sediment samples, collected by sediment traps in Austria and additionally by grab sampling in the Danube during research cruises between Germany and the delta (Black sea) are shown and discussed. Goal of the investigation is the protection of public and environment, especially the sustainable use and conservation of human freshwater resources against harmful radioactive exposure.

  12. Originality of Foreign Language Teaching Technologies in Higher Educational Establishments of the Danube River Basin Countries

    Directory of Open Access Journals (Sweden)

    Olga Demchenko

    2014-08-01

    Full Text Available The article is aimed at investigating the originality of foreign language teaching technologies in higher educational establishments of the Danube river basin countries. Definitions of teaching technologies, typology of some foreign language teaching technologies, analysis of activity learning technologies are given. The stress is made on the importance of competence and communicative approaches in Maritime English teaching in the Danube basin higher educational establishments.

  13. The Legal Status of the Danube Delta Biosphere Reservation

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    Florica Brasoveanu

    2012-05-01

    Full Text Available In recent years the world has become aware that natural resources are not inexhaustible, that manyspecies are threatened with extinction and that is is necessary to strive for judicious use of natural resources tofulfill the needs of the present without compromising the ability of future generations to meet their needs(principle of sustainable development. To conserve species and habitats protected areas have beenestablished worldwide. The protected area is a geographically defined area, with rare natural elements and / orendangered species, regulated and managed in order to achieve specific conservation objectives. Althoughranked Europe's second in size (after the Volga River and the 20th in the world, because of the rich landscapeand wildlife, with the birds ranked most important, the Danube Delta has a very special interest scientificallyas it is a natural laboratory of forming delta, tourism and economic ecosystems, through its renewable naturalresources of which the most important resources are living aquatic resources.

  14. The Legends of the Serpent Island in the Danube Delta

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    Tetyana Shevchuk

    2015-08-01

    Full Text Available The report presents a variety of ancient legends, connected with the cult of Achilles on the Serpent (Snake Island, located in 35 km far from the Danube Delta in the territorial waters of Ukraine. The sources of ancient legends are the essay of Flavius Arrian “Periplus Ponti Euxini (maritime guide”, Flavius Philostratus dialogue “On Heroes” (Heroikos, as well as the outlines of Arctinus of Miletus, Maximus of Tyre and Romanian folklore. The imageries of Achilles Pontarchis cult on the Serpent Island (in ancient times – Levka Island, White Island, Island of the Blessed, Fidonisi, Ilan-Ada, Sherpilor disclose the peculiarities of his worship in Scythia and Dacia.

  15. CRUISE SHIP TOURISM ON THE DANUBE RIVER. CASE STUDY: CAPITALIZATION OF DELTAIC TOURISM POTENTIAL

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    IRINCU Elena

    2015-12-01

    Full Text Available Over the past two decades, river cruise tourism has witnessed a strong development, being preferred by more tourists each year, to the detriment of other forms of tourism. The presence of a plethora of attractive resources, concentrated along the inland waterways represents a particular offer for tourism development, through proper planning. However, in Romania, river cruise tourism is still incipient, even though cruises on the Danube are available, on a regular basis, since the 1970s. This research focuses on cruise ship tourism on the Danube, in particularly on the deltaic sector; with the Romanian ship MS Delta Star as a case study. Following, a brief presentation of the evolution of this type of tourism on the Danube River and its peculiarities on the Romanian sector, especially in the Danube Delta, was made. The assessment framework of the tourism potential of the Danube Delta at the level of administrative-territorial units was developed by applying the methodology from the National Spatial Plan. After correlating the results of the assessment with the current capitalization of tourism potential of the delta by the cruise ship included in the study, it is highlighted the need for optimizing the structure of the offer for this tourism sector. Identifying the most valuable elements of the Danube Delta, in terms of touristical attractions and including them to future itineraries for tourists on cruise ships guarantees a better capitalization of the tourism potential attracting therefore, a greater number of tourists.

  16. Hydrological simulation of flood transformations in the upper Danube River: Case study of large flood events

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    Mitková Veronika Bačová

    2016-12-01

    Full Text Available The problem of understand natural processes as factors that restrict, limit or even jeopardize the interests of human society is currently of great concern. The natural transformation of flood waves is increasingly affected and disturbed by artificial interventions in river basins. The Danube River basin is an area of high economic and water management importance. Channel training can result in changes in the transformation of flood waves and different hydrographic shapes of flood waves compared with the past. The estimation and evolution of the transformation of historical flood waves under recent river conditions is only possible by model simulations. For this purpose a nonlinear reservoir cascade model was constructed. The NLN-Danube nonlinear reservoir river model was used to simulate the transformation of flood waves in four sections of the Danube River from Kienstock (Austria to Štúrovo (Slovakia under relatively recent river reach conditions. The model was individually calibrated for two extreme events in August 2002 and June 2013. Some floods that occurred on the Danube during the period of 1991–2002 were used for the validation of the model. The model was used to identify changes in the transformational properties of the Danube channel in the selected river reach for some historical summer floods (1899, 1954 1965 and 1975. Finally, a simulation of flood wave propagation of the most destructive Danube flood of the last millennium (August 1501 is discussed.

  17. The Role of the Nobility in the Development of Navigation on the Danube (XIX - early XX centuries

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    Liliya Tsyganenko

    2013-08-01

    Full Text Available The questions of the place and role of the nobility of Bessarabia in the development of transport Infrastructure of the region in the late 19th - early 20th centuries is disscused. The activity of Prince Y. Gagarin - the first founder of shipping company on the Danube - Russian-Danube Shipping Company, which by 1886 evolved into a major joint-venture private limited transport in Bessarabia - Black Sea-Danube Shipping

  18. Conhecimento ecológico tradicional no fragmento da planície de inundação do alto rio Paraná: percepção ecológica dos pescadores Upper Paraná River floodplain fishermen’s traditional ecological knowledge: fishermen’s ecological feeling

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    Adriana Rosa Carvalho

    2002-05-01

    Full Text Available O conhecimento ecológico é uma sabedoria popular empírica acumulada pela prática de atividades em ambientes naturais. Alterações nos ecossistemas afetam o estoque dos recursos naturais explorados, bem como a prática tradicional deles dependente. Neste trabalho, é apresentado o conhecimento ecológico tradicional dos pescadores da planície de inundação do alto rio Paraná, regiões de Porto Rico (PR e Porto São José, Estado do Paraná. Um breve relato da teoria de fragmentação de habitats é apresentado, visto que esse ambiente está fragmentado pela construção de barragens de hidrelétricas. Três frases e um provérbio que revelam a dinâmica dos processos ecológicos dentre os pescadores foram anotados e confrontados com o conhecimento científico já reunido sobre a região. As frases demonstram uma interpretação popular em consonância com as descobertas científicas na planície. Essa sabedoria está ameaçada pela fragmentação da planície e pela perda da tradição, devido ao abandono da atividade pesqueira.The ecological knowledge is an empiric popular wisdom stored by the fishermen’s natural environmental practice. Changes in ecosystem affect the explored natural resources as well as the traditional practice dependent on them. This paper aims at presenting the upper Paraná river floodplain fishermen’s traditional ecological knowledge from Porto Rico (PR and Porto São José (PR regions. A brief comment on fragmentation theory is presented because of the floodplain fragmentation imposed by the construction of hydroelectric dams. Three phrases and one proverb, which reveal the dynamics of the fishermen’s ecological process, were registered and confronted with the scientific knowledge of the region. The phrases show a popular and traditional interpretation in agreement with the upper Paraná river floodplain scientific discoveries. The ecosystem fragmentation and loss of tradition, due to the fishery practice

  19. Wave modelling south of the Danube Delta in the Black Sea

    Science.gov (United States)

    Rusu, Eugen; Butunoiu, Dorin

    2015-04-01

    A multilevel wave modelling system, based on SWAN (Simulating Waves Nearshore) spectral model, was implemented in the Black Sea and focused on the western coast. Model simulations have been performed for a 10-year time interval (1999-2008). Validations have been carried out against both satellite data and in situ measurements. A high resolution SWAN computational domain (100m x100m), which is focused on the coastal environment south of the Danube Delta, was also implemented. This coastal area includes Sacalin, which is a newly formed island in the Black Sea, south of the Saint George branch of the Danube. Initially, this was an island system, which consisted of two smaller islands, Greater Sacalin and Lesser Sacalin. In time, due to the enhanced sedimentary processes, the two islands merged into a single continuous landmass. The island has become the habitat of a great variety of rare species and for this reason it was declared an ecological reserve. In the high resolution computational domain, focused on the Sacalin Island, the effect of the currents induced by the Danube River outflow was also accounted in the model, together with some other processes specific to the coastal environment as diffraction, triad wave-wave interactions and wave induced set up. Considering the results of the ten-year SWAN model simulations with the modelling system covering the entire sea basin, the most relevant configurations of the environmental matrix, characteristic to this side of the sea, were defined. On this basis, by performing SWAN simulations in the high resolution coastal domain, the wave propagation patterns in the nearshore, together with some parameters related to the shoreline conditions, were evaluated. A great number of possible situations were analyzed. The most relevant correspond to different directions of the incoming waves (N, NE, E and SE, respectively) and significant wave energy conditions. The results provided by the modelling system indicate two different

  20. Flood risk analysis model in the village of St. George/Danube Delta

    Science.gov (United States)

    Armas, I.; Dumitrascu, S.; Nistoran, D.

    2009-04-01

    River deltas may have been cradles for prehistoric civilizations (Day et al. 2007) and still represent favoured areas for human habitats on the basis of their high productivity, biodiversity and favourable economical conditions for river transport (Giosan and Bhattacharya 2005). In the same time, these regions are defined through their high vulnerability to environmental changes, being extremely susceptible to natural disasters, especially to floods. The Danube Delta, with an area of 5640 km2, is the largest ecosystem of the European humid zones. Its state reflects environmental conditions at both local and regional levels via liquid and solid parameters and has to ensure the water supply for the local economy and communities. Flooding of the delta is important for the dynamics of the entire natural system. Floods sustain both alluvial processes and the water supply to deltaic lakes. In addition, flooding frequency is important in flushing the deltaic lake system water, ensuring a normal evolution of both terrestrial and aquatic ecosystems. For human communities, on the other hand, floods are perceived as a risk factor, entailing material damage, human victims and psychological stress. In the perspective of risk assessment research, every populated place faces a certain risk engaged by a disaster, the size of which depends on the specific location, existent hazards, vulnerability and the number of elements at risk. Although natural hazards are currently a main subject of interest on a global scale, a unitary methodological approach has yet to be developed. In the general context of hazard analysis, there is the need to put more emphasis on the problem of the risk analysis. In most cases, it focuses only on an assessment of the probable material damage resulted from a specific risk scenario. Taking these matters into consideration, the aim of this study is to develop an efficient flood risk assessment methodology based on the example of the village of St. George in

  1. Fauna parasitária de Leporinus lacustris e Leporinus friderici (Characiformes, Anostomidae da planície de inundação do alto rio Paraná, Brasil = Parasite fauna of Leporinus lacustris and Leporinus friderici (Characiformes, Anostomidae from the upper Paraná river floodplain, Brazil

    Directory of Open Access Journals (Sweden)

    Gislaine Guidelli

    2006-07-01

    Full Text Available Foram investigadas as faunas parasitárias de Leporinus lacustris e Leporinus friderici da planície de inundação do Alto rio Paraná, Brasil, objetivando compará-las em composição e estrutura das comunidades seguindo-se metodologias usuais no estudo dos parasitas.Foram observados alguns padrões e as faunas podem ser consideradas semelhantes em estrutura. A principal diferença nas faunas parasitárias refere-se às taxas diferenciais de utilização das espécies hospedeiras por algumas espécies parasitas em comum, representadas pela abundância. Esse indicador diferiu entre as espécies de peixes mostrando que, apesar delas serem hospedeiras apropriadas, sua exploração ocorre de forma distinta.The parasite fauna of Leporinus lacustris and Leporinus friderici from the Upper Paraná River floodplain, Brazil, was investigated aiming to make a comparison in terms of composition and structure of the communities. Usual methodologies in the study of parasite fauna were applied. Some patterns were observed, and the faunas can be considered similar in structure. The main difference in the parasite fauna was the use rate of the host by some shared parasite species, represented by abundance. This indicator differed in the fish speciesshowing that, although all are appropriate hosts, their exploitation occurs in different ways.

  2. A new species of Jainus (Monogenea, gill parasite of Schizodon borellii (Characiformes, Anostomidae from the upper Paraná river floodplain, Brazil = Uma nova espécie de Jainus (Monogenea, parasito de brânquias de Schizodon borellii (Characiformes, Anostomidae da planície de inundação do alto rio Paraná, Brasil

    Directory of Open Access Journals (Sweden)

    Letícia Cucolo Karling

    2011-04-01

    Full Text Available Jainus piava n. sp. is described from the gills of Schizodon borellii (Boulenger, 1900 (Characiform, commonly named as piava from the upper Paraná River floodplain, Brazil. The new species differs from the other members of Jainus in the following features: ventral bar thin broadly V-shaped and male copulatory organ (MCO a coil of about 1.5 rings. Jainus piava n. sp. is similar to species of Jainus by having a ventral anchor base with flattened superficial root and elongate rodlike deep root.Jainus piava sp. nov é descrito para brânquias de Schizodon borellii(Boulenger, 1900 (Chacariformes comumente chamado de piava na planície de inundação do alto rio Paraná, Brasil. A nova espécie difere de outros membros de Jainus pelas seguintes características: barra ventral fina levemente em forma de V e órgão copulatório masculino (MCO com cerca de uma volta e meia de diâmetro do anel. Jainus piava sp. nov é similar a outras espécies do gênero Jainus por ter a âncora ventral com uma raiz superficial com extensão alongada.

  3. Approaching hydrate and free gas distribution at the SUGAR-Site location in the Danube Delta

    Science.gov (United States)

    Bialas, Joerg; Dannowski, Anke; Zander, Timo; Klaeschen, Dirk; Klaucke, Ingo

    2017-04-01

    Gas hydrates did receive a lot of attention over the last decades when investigating their potential to serve as a possible source for Methane production. Among other world-wide programs the German SUGAR project sets out to investigate the entire chain from exploitation to production in Europe. Therefore research in the scope of the SUGAR project sets out to investigate a site in European EEZ for the detailed studies of hydrate and gas distribution in a permeable sediment matrix. Among others one aim of the project is to provide in situ samples of natural methane hydrate for further investigations by MEBO drilling. The Danube paleo-delta with its ancient canyon and levee systems was chosen as a possible candidate for hydrate formation within the available drilling range of 200 m below seafloor. In order to decide on the best drilling location cruise MSM34 (Bialas et al., 2014) of the German RV MARIA S MERIAN set out to acquire geophysical, geological and geochemical datasets for assessment of the hydrate content within the Danube paleo-delta, Black Sea. The Black Sea is well known for a significant gas content in the sedimentary column. Reports on observations of bottom simulating reflectors (BSR) by Popescu et al. (2007) and others indicate that free gas and hydrate occurrence can be expected within the ancient passive channel levee systems. A variety of inverted reflection events within the gas hydrate stability zone (GHSZ) were observed within the drilling range of MEBO and chosen for further investigation. Here we report on combined seismic investigations of high-resolution 2D & 3D multichannel seismic (MCS) acquisition accompanied by four component Ocean-Bottom-Seismometer (OBS) observations. P- and converted S-wave arrivals within the OBS datasets were analysed to provide overall velocity depth models. Due to the limited length of profiles the majority of OBS events are caused by near vertical reflections. While P-wave events have a significant lateral

  4. The present condition and projection of construction of railway net of the Danube-Morava corridor

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    Vemić Mirčeta

    2005-01-01

    Full Text Available The railway net of the Danube-Morava corridor, together with the road net represent the central section of the Pan-European transport corridor X. According to the traffic and economic standards, the railway net represents the second main traffic direction of this corridor as the area-functioning system of the territory of Serbia. Main railway lines have favourable positions as they are located along prominent geographical features, namely river valleys thus enabling considerable flow of goods, passengers and information. The paper presents some characteristics of the present condition of the railway net, its functioning and safety, with certain ideas of its future construction and expected exploitation till 2015. Traffic infrastructure represents the initial factor of overall development of a state and its connection with the surrounding countries. It is considered to be of strategic importance for a country to built railway net. Improvement and additional construction of railway lines is of the greatest priority for the purpose of enlargement of overall mobility and quality of life of population, to make urban areas closer, to improve connections, functions efficiency and level of services of railway system, reduction of negative influence on other economic systems and human environment, better safety etc.

  5. Modelling the Transfer and Retention of Nutrients in the Drainage Network of the Danube River

    Science.gov (United States)

    Garnier, J.; Billen, G.; Hannon, E.; Fonbonne, S.; Videnina, Y.; Soulie, M.

    2002-03-01

    The Danube catchment basin (817 000 km 2, 76×10 6 inhabitants) is the major freshwater contributor to the Black Sea (6300 m 3 s -1, 80% of the annual river discharge into the north-western Black Sea). The aim of the modelling approach developed for the Danube River, is to establish how land use and management of the whole watershed are linked to nutrient (N, P, Si) delivery and retention by the river. The approach uses an adaptation of the RIVERSTRAHLER model, which is based on a schematic representation of the drainage network deduced from geomorphological analysis by stream orders. The whole catchment was divided into 10 sub-basins and one branch, to provide a description satisfying both the need to take into account the heterogeneity of the system and the availability of constraints and validation data. On the basis of this description, a hydrological model was developed, which adequately simulated the seasonal variations of the discharge measured at the outlet of the basin. The model itself resulted from the coupling of the hydrological model with a biogeochemical model (RIVE), which takes into account the main ecological processes. It established a link between microscopic processes, their controlling factors and their macroscopic manifestations in terms of nutrient cycling and ecological functioning at the scale of the whole drainage network. The model was validated for the period from 1988 to 1991 on the basis of available observations of the major water-quality variables involved in the eutrophication processes (inorganic nutrients, phytoplankton biomass, dissolved oxygen, etc.). A reasonable agreement was found between the simulations of the model and the observations. Nutrient fluxes to the Black Sea, calculated for our reference period, are in the same range as those obtained via other approaches. Si/P and N/P ratios suggest silicon, rather than phosphorus, limitation for diatoms and phosphorus, rather than nitrogen, limitation for overall phytoplankton

  6. Holocene river history of the Danube: human-environment interactions on its islands in Hungary

    Science.gov (United States)

    Viczián, István; Balogh, János; Kis, Éva; Szeberényi, József

    2016-04-01

    A change in the frequency and magnitude of floods is the main response of river systems to climatic change. Natural floods are highly sensitive to even modest changes of climate. The discharge and the characteristics of floods basically determine the floodplain evolution and the feasibility of human land use and inhabitation on the islands and floodplains. The study revealed that those small islands of large rivers which have the surface rising only some meters above the river are particularly suitable research objects of Holocene climate variability as they are exposed to floods, react sensitively to environmental changes and their evolution may be paralleled with human history. The research area covers the islands of the Danube along the river between Komárom and Paks in Hungary, which is about 250 km, includes more than 50 smaller or formerly existing islands and two extensive islands: the Szentendre Island and Csepel Island. Data gathered from 570 archaeological sites of those islands from Neolithic to Modern Ages were analysed and interpreted in accordance with climate history and floodplain evolution. Nevertheless, the study is not only about river and its environmental history but it demonstrates the role of river and climatic variability in the history of mankind. The environment of the floodplain, the river hydrology, the sedimentation, the formation of islands and the incision and aggradation of surrounding riverbeds, the frequency of devastating floods have significantly changed through the historical time periods, which is reflected in the number and locations of archaeological sites on the islands. Their occupation history reflects the changes in discharge, climate, geomorphology, floods and human impacts and indicates historical periods with low or high probability of inundation. The most favourable periods for an island's occupation concerning the flood risk of its surfaces - and consequently of the banks along the river - are the first parts of a

  7. THE DANUBE STRATEGY AND ITS IMPACT ON THE PROCESS OF UKRAINE-EU RAPPROCHEMENT

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    Artem FYLYPENKO

    2014-10-01

    Full Text Available The research paper analyzes the impact of the Danube strategy on the process of Ukraine-EU rapprochement. The strategy itself is primarily a political document, which provides guidance to States in the region and the EU institutions to ensure the development of the Danube region. This document is unique in a number of parameters. First, its implementation will affect not only the eight Danube States - members of the EU, but also the neighboring countries of the EU. Secondly, it is a comprehensive document that covers not only the transport sector, but environmental issues, development of culture and tourism, education and many others. For Ukraine, the value of the Strategy is primarily due to the fact that in the context of the course of European integration this document provides additional opportunities for entry into the common European space. In addition, the Danube strategy can be considered as a tool for regional development. Strategy parameters cover four regions of Ukraine, located in the Danube River Basin - Odessa, Chernivtsi, Transcarpathian and Ivano-Frankivsk region.

  8. Larvas de Chironomidae arvas (Diptera da planície de inundação do alto rio Paraná: distribuição e composição em diferentes ambientes e períodos hidrológicos = Chironomidae larvae (Diptera from the upper Paraná river floodplain: distribution and composition in different environments and hydrological periods

    Directory of Open Access Journals (Sweden)

    Gisele Cristina Rosin

    2007-01-01

    Full Text Available O presente estudo teve por objetivos, identificar possíveis diferenças na estrutura da comunidade de larvas de Chironomidae em quatro ambientes da planície de inundação do alto rio Paraná com diferentes características e analisar a influência dos fatores abióticos e das variações do nível hidrométrico sobre a comunidade. As coletas foram realizadas em março e setembro de 2003. Em cada um dos 12 pontos coletados foram realizadas quatro amostragens: três para análise biológica e uma para análise sedimentológica. O material biológico foi lavado em conjunto de peneiras com malhas de abertura 2, 1 e 0,2 mm e fixado em álcool 70%. As larvas de Chironomidae foram identificadas até a categoria de gênero. Foram encontradas 1478larvas de Chironomidae pertencentes a 19 gêneros. Polypedilum, Tanytarsus e Chironomus foram registrados em todos os ambientes. As maiores densidades e diversidade de Chironomidae foram registradas nos períodos de águas baixas, especialmente em ambientes lênticos. Avariação da densidade, dominância e diversidade de Chironomidae entre as duas coletas foi influenciada, principalmente, pelo ciclo hidrológico e pelo oxigênio dissolvido, enquanto que a variação espacial esteve associada ao tipo de sedimento, porcentagem de matéria orgânica e a presença ou ausência de macrófitas aquáticas.The present study had the aim to identify possible differences in the community structure of Chironomidae larvae in four different environments of the upper Paraná river floodplain with different characteristics and to analyze the influence of abiotic factors and variations in the hydrometric level of the community. Samplings were carried out in March and September, 2003. Four samplings were taken from each of the 12 collecting points: three for biological analysis and one for sediment analysis. Biological contents were washed with the aid of a system with 2.0; 1.0 and 0.2 mm sieves. Chironomidae larvae were

  9. Continuous hydrological modelling in the context of real time flood forecasting in alpine Danube tributary catchments

    International Nuclear Information System (INIS)

    Stanzel, Ph; Kahl, B; Haberl, U; Herrnegger, M; Nachtnebel, H P

    2008-01-01

    A hydrological modelling framework applied within operational flood forecasting systems in three alpine Danube tributary basins, Traisen, Salzach and Enns, is presented. A continuous, semi-distributed rainfall-runoff model, accounting for the main hydrological processes of snow accumulation and melt, interception, evapotranspiration, infiltration, runoff generation and routing is set up. Spatial discretization relies on the division of watersheds into subbasins and subsequently into hydrologic response units based on spatial information on soil types, land cover and elevation bands. The hydrological models are calibrated with meteorological ground measurements and with meteorological analyses incorporating radar information. Operationally, each forecasting sequence starts with the re-calculation of the last 24 to 48 hours. Errors between simulated and observed runoff are minimized by optimizing a correction factor for the input to provide improved system states. For the hydrological forecast quantitative 48 or 72 hour forecast grids of temperature and precipitation - deterministic and probabilistic - are used as input. The forecasted hydrograph is corrected with an autoregressive model. The forecasting sequences are repeated each 15 minutes. First evaluations of resulting hydrological forecasts are presented and reliability of forecasts with different lead times is discussed.

  10. Identifying Efficient Nitrate Reduction Strategies in the Upper Danube

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    Angel Udias

    2016-08-01

    Full Text Available Nitrogen losses in the form of Nitrate (N-NO3 from point and diffuse sources of pollution are recognized to be the leading cause of water body impairment throughout Europe. Implementation of conservation programs is perceived as being crucial for restoring and protecting the good ecological status of freshwater bodies. The success of conservation programs depends on the efficient identification of management solutions with respect to the envisaged environmental and economic objectives. This is a complex task, especially considering that costs and effectiveness of conservation strategies depend on their locations. We applied a multi-objective, spatially explicit analysis tool, the R-SWAT-DM framework, to search for efficient, spatially-targeted solution of Nitrate abatement in the Upper Danube Basin. The Soil Water Assessment Tool (SWAT model served as the nonpoint source pollution estimator for current conditions as well as for scenarios with modified agricultural practices and waste water treatment upgrading. A spatially explicit optimization analysis that considered point and diffuse sources of Nitrate was performed to search for strategies that could achieve largest pollution abatement at minimum cost. The set of optimal spatial conservation strategies identified in the Basin indicated that it could be possible to reduce Nitrate loads by more than 50% while simultaneously provide a higher income.

  11. The evolution of Sf. Gheorghe (Danube asymmetric deltaic lobe

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    Alfred VESPREMEANU-STROE

    2014-11-01

    Full Text Available The wave asymmetric Sf. Gheorghe lobe is the only active in the Danube delta where river mouth bar (and the associated barrier islands and spits continuously deployed a cyclic development for almost two millennia. During first stage, the Sf. Gheorghe distributary had a small discharge (with an order of magnitude lower than present which after that experienced a rapid increase in consequence of the successive avulsions of Împuţita (southern distributary of Sulina arm and Dunavăţ distributaries. Our morphological analyses together with the newly obtained chronology, revealed the multiple ridgesets structure of Sf. Gheorghe deltaic lobe. In fact, all ridgesets (10 follow a common morphodynamic pattern characterized by the cyclic succession of three stages: i subaqueous mouth bar development, ii barrier island emergence, iii barrier spit phase with several secondary spits derived from an updrift trunk ridge. The size of each ridgeset increased exponentially with every new cycle due to the constant lengthening of the coastline as the downdrift side of the lobe advances seaward through a series of progressively larger similar quadrilaterals, yielding to a constant enlargment of the delta front size. 

  12. Measurement of the present activity concentration in the water of the Danube river (determination of Sr 89, Sr 90 and Cs 137 and gamma spectroscopy). Coordinated programme on radiological and environmental protection studies in the Danube river catchment area

    International Nuclear Information System (INIS)

    Tschurlovits, M.

    1983-07-01

    A monitoring system was developed which fulfills, as a compromise, a number of requirements. These are: sufficient sensitivity to assess the per caput and collective dose from water use in the Danube river; reasonable effort to carry out these measurements. The dose results mainly from natural radionuclides, although artificial radionuclides were also detected, and found to be more than two magnitudes lower than the natural external background. The origin of the artificial radionuclides was identified clearly as to be from nuclear fallout, although NPP were at least partly in operation upstream in the investigation period. This conclusion is proved by clear seasonal effects and simple constraints, e.g., the low activity actually released by NPP. The system can also be useful for assessment of radioecological parameters, e.g., the concentration of radionuclides in fish

  13. Web-based modelling of energy, water and matter fluxes to support decision making in mesoscale catchments??the integrative perspective of GLOWA-Danube

    Science.gov (United States)

    Ludwig, R.; Mauser, W.; Niemeyer, S.; Colgan, A.; Stolz, R.; Escher-Vetter, H.; Kuhn, M.; Reichstein, M.; Tenhunen, J.; Kraus, A.; Ludwig, M.; Barth, M.; Hennicker, R.

    The GLOWA-initiative (Global Change of the water cycle), funded by the German Ministry of Research and Education (BMBF), has been established to address the manifold consequences of Global Change on regional water resources in a variety of catchment areas with different natural and cultural characteristics. Within this framework, the GLOWA-Danube project is dealing with the Upper Danube watershed as a representative mesoscale test site (∼75.000 km 2) for mountain-foreland regions in the temperate mid-latitudes. The principle objective is to identify, examine and develop new techniques of coupled distributed modelling for the integration of natural and socio-economic sciences. The transdisciplinary research in GLOWA-Danube develops an integrated decision support system, called DANUBIA, to investigate the sustainability of future water use. GLOWA-Danube, which is scheduled for a total run-time of eight years to operationally implement and establish DANUBIA, comprises a university-based network of experts with water-related competence in the fields of engineering, natural and social sciences. Co-operation with a network of stakeholders in water resources management of the Upper Danube catchment ensures that practical issues and future problems in the water sector of the region can be addressed. In order to synthesize a common understanding between the project partners, a standardized notation of parameters and functions and a platform-independent structure of computational methods and interfaces has been established, by making use of the unified modelling language, an industry standard for the structuring and co-ordination of large projects in software development [Booch et al., The Unified Modelling Language User Guide, Addison-Wesley, Reading, 1999]. DANUBIA is object-oriented, spatially distributed and raster-based at its core. It applies the concept of “proxels” (process pixels) as its basic objects, which have different dimensions depending on the viewing

  14. Application of multi-criteria analysis and GIS in ecotourism development (Case study: Serbian Danube region

    Directory of Open Access Journals (Sweden)

    Stojković Sanja

    2015-01-01

    Full Text Available Ecotourism can be defined as responsible travel to natural areas that conserves the environment and cultural heritage and improves the well-being of local people. Sustainable planning and management of ecotourism development are important and necessary for increasing positive and decreasing negative effects on the complex environment. This paper analyses the suitability of selected protected natural areas in the Serbian Danube region for the purposes of ecotourism development. The multi-criteria analysis includes several natural and socio-economic factors and criteria which influence ecotourism development. The integration of Geographic Information System (GIS and Analytic Hierarchy Process (AHP greatly facilitates the decision-making process in the ecotourism destination planning. A suitability map of the analysed protected natural areas for ecotourism development as one of the sustainable tourism types is highlighted as a result of this paper. Such analysis assists in the objective promotion of ecotourism destinations and thus contributes to the improvement of Serbian tourism development. [Projekat Ministarstva nauke Republike Srbije, br. 176008

  15. Hydraulic model to assess the hydromorphological changes within the Danube Delta

    Directory of Open Access Journals (Sweden)

    CIOACĂ Eugenia

    2012-09-01

    Full Text Available Morphological changes of the hydrographic networks (rivers /channels /brooks /lakes as result of fluvial processes (erosion and alluvial sedimentation induce modification on hydrologic regime with positive /negative impacts on biodiversity. This paper aims at emphasizing the amplitude of these processes within the Danube Delta Biosphere Reserve (Romanian part inner hydrographic network, by means of the morphologic model, as maincomponent of 3D mathematical /hydraulic model. It is constructed based on geo-referenced database as resulted from hydraulicand bathymetric field measurements carried out within 2008-2010. Hydro-morphological changes are assessed by analyzingthose zones where fluvial processes have been identified to be active, meaning that specific hydraulic conditions are fulfilled,such as: water flow with high energy /high values of hydraulic parameters: level, speed, slope, and solid transport (upstream ofdelta: erosion followed by a decrease of these values (middle part: alluvia sedimentation and ending with very clear water at very low flow velocity (downstream of delta: no fluvial processes. Both erosion and, especially, alluvial sedimentation zones, in low water level conditions lead to disconnection of some channels /lakes generating ecological disequilibrium with negative impact on some flora and fauna species. Thus, the gained knowledge on the aquatic ecosystem function is used as scientific tool for decision making on a sound management of such an environment system in order to improve the quality of aquatic life by restoration of hydrographical network with impacts on habitats and overall ecological reconstruction.

  16. The dispersion of pollutants in the Romanian rivers Olt, Somes and Danube

    International Nuclear Information System (INIS)

    Pascu, M.; Paunica, I.; Pascu, A.

    1999-01-01

    The paper describes the results obtained in three tracer experiments carried out into the Romanian rivers Olt and Somes as well as into the Romanian part of the Danube by using the radioactive tracer 82 Br. The possibility of a radioactive discharge to occur from the Cernavoda Nuclear Power Plant bring to focus also knowing of the distribution of fission products between water and solid suspended material. Consequently there were also studied and presented the distribution coefficients of the radionuclides 131 I, 99 Mo, 144 Ce, 137 Cs, and 95 Zr for clay, loess and the particular alluvium collected from the Danube bed. (author)

  17. Analyzing temporal changes in maximum runoff volume series of the Danube River

    International Nuclear Information System (INIS)

    Halmova, Dana; Pekarova, Pavla; Onderka, Milan; Pekar, Jan

    2008-01-01

    Several hypotheses claim that more extremes in climatic and hydrologic phenomena are anticipated. In order to verify such hypotheses it is inevitable to examine the past periods by thoroughly analyzing historical data. In the present study, the annual maximum runoff volumes with t-day durations were calculated for a 130-year series of mean daily discharge of Danube River at Bratislava gauge (Slovakia). Statistical methods were used to clarify how the maximum runoff volumes of the Danube River changed over two historical periods (1876-1940 and 1941-2005). The conclusion is that the runoff volume regime during floods has not changed significantly during the last 130 years.

  18. Education and Training Needs in the Field of Visitors Receiving Structures and Tourism Services in the Lower Danube Region

    Directory of Open Access Journals (Sweden)

    Gabriela Ţigu

    2010-11-01

    Full Text Available The paper analyzes the new realities and conditions for the development of tourism in the Lower Danube region in the context of the "Danube Strategy" of the EU, the state of the Bulgarian and Romanian tourist market, and the Romania market, as well as the possibilities for development of alternative tourism along the Danube. Special attention has been paid to the problems of education and training in the field of tourist facilities and services in Bulgaria and Romania and the need for their improvement. The reasons for this are that education and training are strategic factor for sustainable development trough contribution to human capital development, within the Romania- Bulgaria Cross-Border Cooperation Program 2007-2013. In relation to this the Academy of Economic Studies in Bucharest, Romania and D. Tsenov Academy of Economics in Svishtov, Bulgaria decided to collaborate in the field “Cooperation on human resources development – joint development of skills and knowledge”, through the development of cross-border liaisons and exchanges between the two universities. Both Bulgaria and Romania have represented and still represent important tourism destinations in Eastern Europe, promoting coastal tourism, spas, mountain resorts or heritage tourism. Comparing with the existent potential and with the other Central and East- European countries, including Bulgaria, Romania has modest economical performances in tourism industry. The last decade shows a relative decline of external demand for Romania, the main causes being the missing fund for investment in developing, modernization, and rehabilitation of specific infrastructure, the less diversification of the entertainment, the tourism services’ quality – lesser comparative with competitors. On other hand, in the same period, Bulgaria has improved the tourism services’ quality and economic performances. Training specialists in tourism is one of the ways of performance growth in this field

  19. Habitat use of the European mudminnow Umbra krameri and association with other fish species in a disconnected Danube side arm.

    Science.gov (United States)

    Sehr, M; Keckeis, H

    2017-10-01

    Fish assemblages along the longitudinal course of an old, disconnected and modified side arm of the Danube floodplain downstream of Vienna, Austria, as well as habitat structure, hydro-morphological and hydro-chemical factors, were investigated in order to analyse the key environmental determinants of the European mudminnow Umbra krameri. Generally, U. krameri was the most abundant species in the system. It occurred in disconnected ditches, ponds and pools with dense reed belts and comparatively low nutrient content, indicating its natural association with marsh habitats. At infrequently disturbed sites it was associated with a small group of stagnophilious and highly specialized species with adaptations to strong oxygen fluctuations. At frequently flooded sites, the species was absent or occurred in low abundances, indicating its adaptation to water bodies in older successional stages and its low competitive power in permanently connected floodplain habitats. © 2017 The Fisheries Society of the British Isles.

  20. Análise das modificações da cobertura vegetal da planície fluvial do alto rio Paraná no período entre 1976 e 2007 = Analysis of vegetation changes in the Paraná river floodplain between 1976 and 2007

    Directory of Open Access Journals (Sweden)

    Edivando Vitor Couto

    2011-04-01

    Full Text Available A vegetação da planície fluvial do rio Paraná sofre a pressão da ocupação antrópica desde a década de 1950. A área próxima a Porto Rico (Paraná tem sido estudada desde os anos 1980, mas não há estudos dirigidos à distribuição espacial da vegetação. Os objetivos deste trabalho são cartografar as unidades vegetais e verificar a evolução temporal de sua distribuição entre 1976 e 2007. Para isso foram utilizadas imagens orbitais de 1976 (LANDSAT MSS-1, 1987 (LANDSAT TM-5, 2000 (LANDSAT ETM+7 e de 2007 (CBERS-2 CCD. Asimagens foram georreferenciadas e classificadas pelo algoritmo Bhattacharya. Foram identificadas três classes de vegetação, corpos de água e áreas de solo exposto. A análise multitemporal demonstrou aumento contínuo da área de solo exposto, aumento da área dos corpos de água, mudança de posição das áreas úmidas no período entre 1976 e 1987 e modificações mais sutis de ambas as classes no período entre 1987 e 2007. As áreas de vegetação arbórea diminuíram em quase todos os anos. Tais dados permitem afirmar que a atuação antrópica sobre a planície vem se ampliando e que as principais cheias modificaram sua morfologia.The removal of vegetation from the Paraná river floodplain has been increasing since the 1950s the until present time, but no study has been made about its spatial distribution. The purpose of this paper is to map and analyze the temporal evolution of vegetation distribution over the Parana river floodplain between 1976 and 2007. Orbital images from 1976 (LANDSAT MSS-1, 1987 (LANDSAT TM-5, 2000 (LANDSAT ETM+7 and 2007 (CBERS-2 CCD were utilized to compare the evolution of the vegetation distribution over that time period. Theimages were georeferenced using SPRING 4.3.3 software and classified by the Bhattacharya algorithm; the maps were produced using the Global Mapper 7.4 software. Three different classes of vegetation, water bodies and exposed soil areas were

  1. The discharge of certain amounts of industrial microplastic from a production plant into the River Danube is permitted by the Austrian legislation.

    Science.gov (United States)

    Lechner, Aaron; Ramler, David

    2015-05-01

    Numerous studies have quantified the amount of plastic litter in aquatic ecosystems and tried to assess its impacts and threats. This reflects a rising awareness of plastic as an environmental problem. As a next logical step, identifying and regulating the sources must be in the focus of scientific efforts. We report on a spillage of industrial microplastic (IMP) from a production plant situated at an Austrian Danube tributary. This is the first identified point source of IMP litter in freshwater systems. However, due to generous thresholds established by the Austrian government substantial amounts of IMP are legally introduced into running waters. Copyright © 2015 Elsevier Ltd. All rights reserved.

  2. Narrating Regional Identity in Tourism--Sketches from the Austrian Danube Valley

    Science.gov (United States)

    Ploner, Josef

    2009-01-01

    This article sketches the processes of regionalisation in the realm of present day tourism. By exploring issues of "regional culture" and "diversity" in Austria, and more particular, in the highly symbolic Danube valley "Wachau", the article shows how the imaginaries of contested cultural spaces--be they…

  3. A qualitative reasoning model of algal bloom in the Danube Delta Biosphere Reserve (DDBR)

    NARCIS (Netherlands)

    Cioaca, E.; Linnebank, F.E.; Bredeweg, B.; Salles, P.

    2009-01-01

    This paper presents a Qualitative Reasoning model of the algal bloom phenomenon and its effects in the Danube Delta Biosphere Reserve (DDBR) in Romania. Qualitative Reasoning models represent processes and their cause-effect relationships in a flexible and conceptually rich manner and as such can be

  4. Cossacks on the Danube Territories (the End of XVIII - the 20s of the XIX c.)

    OpenAIRE

    Alexander Lebedenko

    2013-01-01

    The article examines the emergence of Ukrainian Cossacks on the banks of the Danube in the XVIII-XIX centuries, their influence on the economic and cultural development of the region, the role of the Cossacks in rosiyskogo-Turkish wars of the period.

  5. Balance of Comparative Advantages in the Processed Food Sector of the Danube Countries

    Directory of Open Access Journals (Sweden)

    Svetlana Ignjatijević

    2015-05-01

    Full Text Available In this paper, we investigated the level of competitiveness of the processed food sector of the Danube region countries, in order to show the existence of comparative advantage and the correlation of exports. We used the Balassa (RCA–revealed comparative advantage index and TPI (trade performance indexes. At first, using the Pearson and Spearman index, we examined the existence of correlations between the processed food sector of the Danube countries. Then, we applied the Least Significant Difference (LSD test to further compare the value and answered the question: between which Danube countries are there significant differences? With the study, we found that the distribution of the RCA index in Bosnia and Herzegovina, Hungary, Moldova and Slovenia deviates from normality. We also found the existence of a strong correlation of the RCA index of the Czech Republic with Romania, Hungary with Moldova and Serbia, Moldova with Serbia and Bulgaria with Ukraine. Finally, we concluded that the development of trade in the countries of the Danube region requires the participation of all relevant interest groups and could play an important role in providing faster economic development, that is in achieving sustainable development of the countries, with the sustainable use of available resources.

  6. Delineating locals: Transformations of knowledge/power and the governance of the Danube delta

    NARCIS (Netherlands)

    Assche, van K.A.M.; Duineveld, M.; Beunen, R.; Teampau, P.

    2011-01-01

    In this paper, we adopt a Foucauldian perspective on power/knowledge interactions to investigate the evolution and implementation of policy for the Romanian Danube delta. We argue that a better understanding of the potential for citizen participation in environmental governance can be obtained from

  7. Crossing trails in the marshes: rigidity and flexibility in the governance of the Danube Delta

    NARCIS (Netherlands)

    Assche, van K.A.M.; Beunen, R.; Jacobs, A.J.; Teampau, P.

    2011-01-01

    In this paper, we revisit the utility of the concepts of path dependence and interdependence for the analysis of participatory environmental governance. We investigate the evolution of environmental governance in the Romanian Danube Delta, and, starting from an observation of problematic citizen

  8. Mosquitoes in the Danube Delta: searching for vectors of filarioid helminths and avian malaria

    Czech Academy of Sciences Publication Activity Database

    Ionică, A.M.; Zittra, C.; Wimmer, V.; Leitner, N.; Votýpka, Jan; Modrý, David; Mihalca, A. D.; Fuehrer, H.-P.

    2017-01-01

    Roč. 10, JUL 5 (2017), č. článku 324. ISSN 1756-3305 Institutional support: RVO:60077344 Keywords : Danube Delta * filarioids * avian malaria * mosquito vectors Subject RIV: GJ - Animal Vermins ; Diseases, Veterinary Medicine OBOR OECD: Tropical medicine Impact factor: 3.080, year: 2016

  9. The Perspective of the Development of the Vinous Tourism in the Ukrainian Danube

    Directory of Open Access Journals (Sweden)

    Margarita Diduh

    2013-08-01

    Full Text Available Viniculture is the traditional branch of the specialization of the agriculture of the Ukrainian Danube. Technology of the production of the wine by different ethnic groups can be traced here. It creates the favorable ground for the development of the vinous tourism in the context of the unique agroclimatic conditions of the territory

  10. Danube paleohydrology: Hyperspectral and sedimentological high-resultion study of the last glacial Black Sea rythmites

    Science.gov (United States)

    Martinez Lamas, R.; Debret, M.; Deloffre, J.; Toucanne, S.

    2017-12-01

    The Black Sea has undergone alternating phases of lacustrine and marine environment over geological timescales directly related to its semi-enclosed character and to eustatic sea-level oscillations. During lowstand conditions, as during the last glacial period, the Black Sea was a giant lake disconnected from the global ocean. At that time, Black Sea water-level was controlled by regional climate, and by Eurasian rivers, including the Danube that acted as an outlet of European Ice Sheet and the Alpine ice cap. Thus, the paleo-mouth of the Danube river contains a high quality archive for the study of the paleohydrology of the Danube River and by extension of the European climate changes during the last 30 kyr. For this purpose, we have focused on the GAS-CS01 calypso long-piston core (33.4 m) which was taken during GHASS cruise (Ifremer, 2015) on the upper slope (240 m. depth) at about 25 km east of the Danube Canyon, i.e. in the sediment pile of the Danube paleo-mouth during the last glacial period. Our chronology reveals that core GAS-CS01 extends back to 31 cal kyr BP. The lithology of GAS-CS01 is characterized by clastic rythmites which are presented as a high-resolution Danube runoff proxy. Preliminary results of sedimentological and chronological analysis showed five peaks of terrestrial discharges between ca 31 and 14 ka BP, probably linked to five phases of the enhanced runoff during the studied period. In order to understand the origin and the depositional processes of this laminae, we combined sedimentary analysis (x-ray diffraction, x-ray fluorescence, grain size ...) and hyperspectral images analysis. Hyperspectral imagery is a non-destructive fast method classically used to quantify colour and provides data with high spatial (57-µm pixel size) and spectral (3 nm) resolution. The multi-proxy calibration is essential in order to obtain a high-resolution sedimentological dataset. This information allows us to reconstruct the nature and depositional

  11. Large-scale water resources management within the framework of GLOWA-Danube. Part A: The groundwater model

    Science.gov (United States)

    Barthel, Roland; Rojanschi, Vlad; Wolf, Jens; Braun, Juergen

    The research project GLOWA-Danube, financed by the German Federal Government, is investigating long-term changes in the water cycle of the upper Danube river basin (77,000 km 2) in light of global climatic change. Its aim is to build a fully integrated decision-support tool “DANUBIA” that combines the competence of 11 different research institutes in domains covering all major aspects governing the water cycle-from the formation of clouds, to groundwater flow patterns, to the behaviour of the water consumer. Both the influence of natural changes in the ecosystem, such as climate change, and changes in human behaviour, such as changes in land use or water consumption, are considered. DANUBIA is comprised of 15 individual disciplinary models that are connected via customized interfaces that facilitate network-based parallel calculations. The strictly object-oriented DANUBIA architecture was developed using the graphical notation tool UML (Unified Modeling Language) and has been implemented in Java code. All models use the same spatial discretisation for the exchange of data (1 × 1 km grid cells) but are using different time steps. The representation of a vast number of relevant physical and social processes that occur at different spatial and temporal scales is a very demanding task. Newly developed up- and downscaling procedures [Rojanschi, V., 2001. Effects of upscaling for a finite-difference flow model. Master’s Thesis, Institut für Wasserbau, Universität Stuttgart, Stuttgart, Germany] and a sophisticated time controller developed by the computer sciences group [Hennicker, R., Barth, M., Kraus, A., Ludwig, M., 2002. DANUBIA: A Web-based modelling and decision support system for integrative global change research in the upper Danube basin. In: GSF (Ed.), GLOWA, German Program on Global Change in the Hydrological Cycle Status Report 2002. GSF, Munich, pp. 35-38; Kraus, A., Ludwig, M., 2003. GLOWA-Danube Papers Technical Release No. 002 (Danubia Framework

  12. Determination of Cs-137, Sr-89 and Sr-90 and gamma spectroscopy of water samples from the Danube River

    International Nuclear Information System (INIS)

    Tschurlovits, M.

    1980-01-01

    Radioactivity concentration of Cs-137, Sr-90, Sr-89, Co-60 and K-40 from the Danube water in the period of 1977-1979. A few systematic changes in the radioactivity concentrations were observed and presented. (author)

  13. Danube quality water assessment from the microbiological point of view in Cernavoda nuclear plant area

    International Nuclear Information System (INIS)

    Sundri, Mirela Iuliana

    2003-01-01

    Herein are analysed the following microbiological parameters: total viable count, total coliforms and faecal coliforms, which represent a standard indicator for water quality. The study has been done during 1998-2002 upon the water in the Danube River and in the channels for cooling water used by Cernavoda Nuclear Power Plant condensers. In this area, based on these values of evaluated parameters, the water feature is placed in the quality classes II and III (moderate and critical pollution), in conformity with European Community Directives. Bacterial communities, component part of aquatic biocenoses, are very important for matter and energy flux. Their contribution to self-purification processes of rivers is of great interest related to the water quality assessment. Microorganisms are ideal sensors, because they respond fast to the fluctuation of environmental conditions by specific changes, detectable physiologically and metabolically. The temperature is a major factor, which directly affects the intensity of all microbial processes. Because the microorganisms are interconnected with the other living organisms, the qualitative or quantitative changes of their activity will affect the functions of the whole ecosystem. Bacterial indicators such as total viable count (colony count), total coliforms or faecal coliforms (thermo-tolerant coliforms) are widely applied to the assessment of water quality. Because of their mostly allochthonus origin, these are used as indicators of changes in the natural water conditions; they point out an organic matter or faecal water pollution. Although the water quality can be considered acceptable from the chemical or biological point of view, the bacteriological parameters might be detected in critical concentration. The objectives of this microbiological assessment are analysis of the variation of bacteriological indicators in some sampling points of Cernavoda aquatic ecosystems area, and monitoring the manner of using the water by

  14. "Possible impacts of climate change on the Danube river along the Iron Gate gorge

    Science.gov (United States)

    Adamovic, M.

    2009-04-01

    The research was dedicated to foreseeing the possible impacts of climate change on water resources in eastern part of Serbia, along the Danube catchment. The Danube basin is in the eastern section of the considered RCM ( Regional climate model). For this purposes, the RCM EBU-POM according to the IPCC scenario A1B, was used in its representation of the hydrological balance over the Danube river basin along Iron Gate gorge, for the time frame 1961-1990 and 2071-2100. The Danube's catchment encompasses continental climate, as it is land-dominated by advection from the surrounding land areas. This part of Danube catchment is greatly affected by the Mediterranean climate, since the Danube runoff gives a relevant contribution of freshwater flux into the Mediterranean sea and it is dependent mostly on precipitated water of Mediterranean origin. On the other, the Dinaric-Balkan mountain chains in the west and the Carpathian mountain bow in the north and east, present distinctive morphological and climatic regions and barriers. The hydrological balance has been computed in two different, but in principle equivalent ways. The first approach, which has a more hydrological nuance, relies on establishing relationships between annual averages of the hydrological balance parameters (E, P, T) in order to get relevant coefficients. The second approach, which is more typically meteorological, relies on the calculation of the E for the time frame 2071-2100 by using the previous coefficients and getting runoff depth (h) and discharge (Q) as the final outputs. The results according to this model, show that the river flow of the Danube, in this part of its basin, will decrease over 50% with a great consequences to the dams Iron Gate I and II, their accumulations and ecosystems. Furthermore, if we take into account predictions made by IPCC which say that the south-east Europe will face temperature growth of 0.2 degrees in the next two decades for the range of SRES scenarios, makes the

  15. TRANSBOUNDARY IMPACT OF THE CHERNAVODSKA NPP ON TRITIUM POLLUTION OF THE DANUBE RIVER ON THE TERRITORY OF UKRAINE

    Directory of Open Access Journals (Sweden)

    V. I. VIT`KO

    2015-10-01

    Full Text Available This article reviews the influence of the Chernavodska nuclear power plant on the aquatic environment of the Danube River in the transboundary context. Data of tritium discharges, dependence of volume activity of tritium in the Danube River, and its inflows from the surrounding areas to its mouth. The average annual volume activities of tritium are provided. Assessments of the impact of the Chernavodska NPP in conditions that are different from the norm have been given.

  16. The June 2013 flood in the Upper Danube Basin, and comparisons with the 2002, 1954 and 1899 floods

    Science.gov (United States)

    Blöschl, G.; Nester, T.; Komma, J.; Parajka, J.; Perdigão, R. A. P.

    2013-12-01

    The June 2013 flood in the Upper Danube Basin was one of the largest floods in the past two centuries. An atmospheric blocking situation produced precipitation exceeding 300 mm over four days at the northern rim of the Alps. The high precipitation, along with high antecedent soil moisture, gave rise to extreme flood discharges in a number of tributaries including the Tiroler Ache, Saalach, Salzach and Inn. Runoff coefficients ranged from 0.2 in the Bavarian lowlands to 0.6 in the Alpine areas in Austria. Snowfall at high altitudes (above about 1600 m a.s.l.) reduced the runoff volume produced. Precipitation was distributed over two blocks separated by a few hours, which resulted in a single peak, long-duration flood wave at the Inn and Danube. At the confluence of the Bavarian Danube and the Inn, the small time lag between the two flood waves exacerbated the downstream flood at the Danube. Because of the long duration and less inundation, there was less flood peak attenuation along the Austrian Danube reach than for the August 2002 flood. Maximum flood discharges of the Danube at Vienna were about 11 000 m3 s-1, as compared to 10 300, 9600 and 10 500 m3 s-1 in 2002, 1954 and 1899, respectively. This paper reviews the meteorological and hydrological characteristics of the event as compared to the 2002, 1954 and 1899 floods, and discusses the implications for hydrological research and flood risk management.

  17. Flebotomíneos de várzea do rio Aguapeí, região noroeste do Estado de São Paulo, Brasil Sand flies in the Aguapeí river floodplain, northwest area of State of São Paulo, Brazil

    Directory of Open Access Journals (Sweden)

    Rosa M F N Odorizzi

    2007-08-01

    Full Text Available OBJETIVO: Investigar a sazonalidade de flebotomíneos de acordo com sua ocorrência e densidade. MÉTODOS: A pesquisa for realizada em área de várzea do rio Aguapeí, do município de Mirandópolis, Estado de São Paulo. Os flebotomíneos foram capturados mensalmente com armadilhas automáticas luminosas, instaladas das 18:00 às 7:00 horas, durante um ano (2004-2005, em dois locais: varanda de um rancho de pesca e mata. Utilizou-se a média de Williams para o cálculo da sazonalidade dos flebotomíneos e teste de qui-quadrado para comparação. RESULTADOS: Foram capturados 35.995 flebotomíneos. Cinco espécimes eram Brumptomyia avellari, um Psathyromyia (Xiphomyia hermanlenti e os demais Nyssomyia neivai, que apresentou freqüência mais elevada no inverno. É o primeiro registro de Ps. hermanlenti no Estado. CONCLUSÕES: A alta densidade de Nyssomyia neivai, um dos vetores suspeitos de transmitir a leishmaniose tegumentar americana, aponta o risco de transmissão dessa doença no local, principalmente nos períodos mais secos do ano.OBJECTIVE: To investigate the seasonal variation of sand flies regarding their occurrences and densities. METHODS: The study was conducted in the Aguapeí river floodplain in the state of São Paulo, southeastern Brazil. Sand flies were monthly captured with automatic light traps set up between 18:00 and 7:00 hours, over a period of one year (2004-2005, at two sites: veranda of a domicile and in a forest on the banks of Aguapeí River. The Williams' average was used for estimating the seasonal variation and the Chi-square test for comparison. RESULTS: A total of 35,995 specimens were captured: five Brumptomyia avellari, one Psathyromyia (Xiphomyia hermanlenti and the rest Nyssomyia neivai, which had the highest frequency during the winter. Ps. hermanlenti is first recorded in state of São Paulo. CONCLUSIONS: The high density of Nyssomyia neivai, a suspected vector of cutaneous leishmaniasis, points out to the

  18. Species richness of testate amoebae in different environments from the upper Paraná river floodplain (PR/MS = Riqueza de amebas testáceas em diferentes ambientes da planície de inundação do alto rio Paraná (PR/MS

    Directory of Open Access Journals (Sweden)

    Deise de Morais Costa

    2011-07-01

    Full Text Available This study evaluated the species richness of testate amoebae in the plankton from different environments of the upper Parana river floodplain. Samplings were performed at subsurface of pelagic region from twelve environments using motorized pump and plankton net (68 ƒÝm, during four hydrological periods. We identified 67 taxa, distributed in seven families and Arcellidae, Difflugiidae and Centropyxidae were the most representative families. Higher values of species richness were observed in the lakes (connected and isolated during the flood pulses. Centropyxis aculeata, Difflugia gramem and D.pseudogramem were frequent throughout the study period. Seasonal variability of species in the channels and isolated lakes was evidenced by beta diversity. Besides that, in the rivers, extreme changes in species composition were verified during the high-water period. Our results highlight the importance of the present study to improve the knowledge about the diversity and geographic distribution of these organisms in Brazil and emphasize the importance of current flow in the displacement of testate amoebae from their preferredhabitats, marginal vegetation and sediment.Este estudo objetivou avaliar a riqueza de taxons de amebas testaceas no plancton de diferentes ambientes da planicie de inundacao do alto rio Parana. Foram amostrados 12 pontos da regiao pelagica em diferentes ambientes (rios, canais e lagoas e em quatro periodos hidrologicos. Foram identificados 67 taxons, distribuidos em sete familias. Arcellidae, Difflugiidae e Centropyxidae foram as familiasmais especiosas. Nas lagoas (abertas e fechadas, durante os pulsos de inundacao, foram observados os maiores valores para a riqueza de especies. Centropyxis aculeata, Difflugia gramem e D. pseudogramem foram frequentes durante todo o periodo estudado. Os dados obtidos pela diversidade beta evidenciaram a variabilidade sazonal das especies nos canais e lagoas fechadas. Nos rios, as alteracoes

  19. Hábitos alimentares e sobreposição trófica das raias Potamotrygon falkneri e Potamotrygon motoro (Chondrichthyes, Potamotrygonidae na planície alagável do alto rio Paraná, Brasil = Feeding habitats and trophic overlap of the freshwater stingrays Potamotrygon falkneri e Potamotrygon motoro (Chondrichthyes, Potamotrygonidae in the upper Paraná river floodplain, Brazil

    Directory of Open Access Journals (Sweden)

    Milza Celi Fedatto Abelha

    2006-07-01

    Full Text Available As raias Potamotrygon falkneri e Potamotrygon motoro foram avaliadas em relação à composição de suas dietas e a sobreposição do nicho trófico nos períodos de seca (agosto/2004 e cheia (janeiro/2005 na planície alagável do alto rio Paraná, em três estações de coleta próximas à ilha Mutum. Foram analisados 49 conteúdos estomacais de P. falkneri e 16 de P. motoro, obtidos de espécimes capturados através de pesca com anzol, fisga (arpão e espinhel. Os conteúdos estomacais foram analisados de acordo com os métodos de freqüência volumétrica e de ocorrência. A similaridade da dieta foi quantificada pelo índicede sobreposição de Pianka. As espécies revelaram flexibilidade alimentar, com ambas consumindo predominantemente moluscos na cheia, enquanto na seca a dieta de P. falkneri foi composta principalmente por peixes e a de P. motoro por insetos aquáticos. Os valores doíndice de sobreposição de nicho variaram entre 0,38 na seca (moderado e 0,94 na cheia (acentuado. A variação da composição das dietas foi atribuída às oscilações na disponibilidade dos recursos alimentares no ambiente.Feeding habits and trophic overlap of freshwater stingrays Potamotrygon falkneri e Potamotrygon motoro were evaluated in the upper Paraná river floodplain. Samples were collected during periods of drought (August/2004 and flood (January/2005 near Mutum island. Fishhook, harpoon and long line were used to capture the individuals and a total of 49 stomach contents of P. falkneri and 16 of P. motorowere analyzed. Diet composition was analyzed by the relative occurrence and volumetric frequencies. The trophic overlap was quantified by the index of niche overlap of Pianka. Results indicated that both species predominantly consumed mollusks during the floodseason, while in the drought season the diet of P. falkneri was composed mainly by fish and P. motoro for aquatic insects. The values of the index of niche overlap varied from 0.38, in

  20. O gênero Eugenia L. (Myrtaceae na planície de alagável do Alto Rio Paraná, Estados de Mato Grosso do Sul e Paraná, Brasil The genus Eugenia L. (Myrtaceae on the Upper Paraná River floodplain, Mato Grosso do Sul and Paraná States, Brazil

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    Mariza Barion Romagnolo

    2006-09-01

    Full Text Available Foi realizado o levantamento das espécies de Eugenia L. da planície alagável do Alto Rio Paraná, Estados de Mato Grosso do Sul e Paraná (22º40' a 22º55'S e 53º10' a 53º40'W. Esta área localiza-se no domínio da Floresta Estacional Semidecidual e apresenta formações ripárias ao longo do rio Paraná, de suas ilhas e de seus tributários. As espécies registradas foram: Eugenia egensis DC., E. florida DC., E. hyemalis Cambess., E. klappenbachiana Mattos & D. Legrand, E. moraviana O. Berg, E. pyriformis Cambess., E. ramboi D. Legrand, E. repanda O. Berg., E. sulcata Spring. ex Mart. e E. uniflora L. Os meses que apresentaram o maior número de espécies em floração e frutificação foram respectivamente, setembro e novembro. Eugenia florida, E. hyemalis e E. repanda apresentam ampla distribuição na área, enquanto que E. ramboi e E. sulcata foram encontradas somente na margem esquerda do rio Paraná. É fornecida uma chave para a identificação das espécies, acompanhada de ilustrações e descrições das mesmas, além de informações sobre o período de floração, frutificação e distribuição na área estudada.A floristic survey of Eugenia L. species of the Upper Paraná River floodplain in Mato Grosso do Sul and Paraná States, Brazil (22º40'-22º55'S; 53º10'-53º40'W is presented. The study area is covered by Seasonal Semideciduous Forest, with riparian formations along the Paraná River and its islands and tributaries. The following species were identified: E. egensis DC., E. florida DC., E. hyemalis Cambess., E. klappenbachiana Mattos & D. Legrand, E. moraviana O. Berg, E. pyriformis Cambess., E. ramboi D. Legrand, E. repanda O.Berg., E. sulcata Spring. ex Mart., and E. uniflora L. The greatest number of species in flower or fruit was detected in September and November, respectively. Eugenia florida, E. hyemalis and E. repanda are widely distributed in the study area, whereas E. ramboi and E. sulcata were observed only

  1. Spatial and seasonal distribution of chromophoric dissolved organic matter in the Upper Paraná River floodplain environments ( Brazil Distribuição espacial e sazonal da matéria orgânica dissolvida cromófora em ambientes da planície de inundação do alto rio Paraná (Brasil

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    Mariana Carolina Teixeira

    2011-12-01

    Full Text Available AIM: Our aim was to identify dissolved organic matter (DOM main sources in environments of the Upper Paraná River floodplain and their seasonal and spatial variation. METHODS: Ultraviolet-visible and fluorescence spectroscopy were utilized. The samples were obtained from November 2007 to September 2008 in six lakes of the floodplain. RESULTS: DOM quality differs among environments and also between rainy and dry season. The environments connected with Paraná River showed a high variation on the allochthonous/autochthonous proportion. Aquatic macrophytes might represent an important contribution to DOM in Garças and Osmar lakes. CONCLUSIONS: In general, environments connected to Paraná River have a greater influence of autochthonous DOC, while the others are most influenced by allochthonous inputs.OBJETIVO: O objetivo deste estudo foi identificar a origem da matéria orgânica dissolvida (MOD em ambientes da planície de inundação do alto rio Paraná e sua variação sazonal e espacial. MÉTODOS: Para tal, foram utilizadas técnicas de espectroscopia ultravioleta-visível e de fluorescência. As amostras foram coletadas no período de novembro de 2007 a setembro de 2008 em seis lagoas da planície de inundação. RESULTADOS: A qualidade da MOD difere entre ambientes e também entre as estações seca e chuvosa. Os ambientes conectados ao rio Paraná apresentaram grande variação na proporção autóctone/alóctone. Macrófitas aquáticas podem representar uma contribuição importante à MOD nas lagoas Garças e Osmar. CONCLUSÕES: Em geral, ambientes conectados ao rio Paraná têm maior influência de COD autóctone, enquanto os demais têm maior influência de COD alóctone.

  2. Characterization of habitats based on algal periphyton biomass in the upper Paraná River floodplain, Brazil Mudanças na biomassa de algas perifíticas na planície de inundação do alto Rio Paraná, Brasil

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    JA. Leandrini

    2008-08-01

    Full Text Available Considering the relevant role played by the hydrological regime on the structure and functioning of floodplains, this study aims at characterizing different types of aquatic environments according to periphyton biomass and evaluating the influence of the fluviometric levels of the Paraná River and other forcing functions upon the periphytic community. Periphyton (chlorophyll a was analyzed in 28 habitats, during the years 2000 and 2001, in high and low water seasons. Both years were characterized by lacking the characteristic high water season. The Principal Components Analysis revealed two groups. The first component was positively associated with hydrometric level, electric conductivity, pH and transparency, and negatively with total nitrogen and total phosphorus, dissolved organic carbon and turbidity. The second component separated the habitats of Paraná River in the period of low waters from other environments, mainly for hydrometric level and high transparency values. Periphytic biomass of the habitats demonstrated that the maintenance of the functional integrity of the Upper Paraná River floodplain is closely related to its hydrologic cycle.Tendo como princípio que o regime hidrológico é a principal função de força em planícies de inundação, este trabalho visa caracterizar diferentes ambientes através da biomassa da comunidade perifítica e relacionar a influência do nível hidrométrico sobre esta comunidade. Para isso, a biomassa perifítica (clorofila a foi analisada em 28 habitats, sendo amostrados dois anos, 2000 e 2001, em diferentes períodos, águas altas e águas baixas. Na Análise de Componentes Principais, foram evidenciados dois grupos. O primeiro componente associado positivamente com o nível hidrométrico, condutividade elétrica, pH e transparência e, negativamente, com nitrogênio e fósforo total, carbono orgânico dissolvido e turbidez. O segundo componente separou os ambientes pertencentes ao rio Paran

  3. ANATOMICAL-HISTOLOGICAL OBSERVATIONS CONDUCTED ON AQUATIC FERNS IN THE DANUBE DELTA

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    Anca SÂRBU

    2017-12-01

    Full Text Available This paper analyses aquatic ferns from the genera Azolla Lam., Marsilea L. and Salvinia Séguier, which occur in the Danube Delta, Romania, and comprises a series of anatomical and histological observations of taxonomical, chorological and eco-morphological importance. The research conducted on specimens collected between 2005-2013 from the natural habitats of the Danube Delta, but also from the extra-deltaic artificial habitats have enabled: i a reconsideration of some chorological aspects regarding the species of the genus Azolla in Romania; ii a greater understanding of the adaptive plasticity relative to the factor water for the taxon Marsilea quadrifolia L. collected from natural and artificial habitats; iii the enrichment of the data regarding the structural characteristics of the taxon Salvinia natans (L. All., particularly around the adaptive elements associated with living on the surface of the water.

  4. Measurement of Danube sediment radioactivity in Serbia and Montenegro using gamma ray spectrometry

    International Nuclear Information System (INIS)

    Bikit, I.; Slivka, J.; Veskovic, M.; Varga, E.; Zikic-Todorovic, N.; Mrda, D.; Forkapic, S.

    2006-01-01

    The radionuclide content of 54 sediment samples collected from 18 locations distributed along the Vojvodina part of the Danube was determined by means of low-level, high-resolution gamma-spectroscopy. Beside the members of the natural radioactive chains of 238 U, 232 Th and the natural 4 K, 137 Cs content of Chernobyl origin was also detected. The data obtained are compared with those collected during four years starting after the Chernobyl accident, and the elimination rate of 137 Cs from the river ecosystem is discussed. No traces of after-Chernobyl 137 Cs were found. The radioactivity of the Danube sediment is now similar to the pre-Chernobyl era

  5. Planktonic rotifer assemblages of the Danube River at Budapest after the red sludge pollution in Hungary.

    Science.gov (United States)

    Schöll, Károly; Szövényi, Gergely

    2011-08-01

    In the autumn of 2010 an industrial red sludge spill occurred in Hungary. The toxic chemical waste with high alkalinity (pH 13.5) reached the Danube 2 days later, where no change was expected because of the high level of dilution. The planktonic rotifer assemblages of the Danube were investigated at Budapest during the contamination. The median of community density decreased from 500 ind. 100 L(-1) to zero, the species richness from 3.00 to 0.00, Shannon-Weaver diversity from 1.10 to 0.00 after the arrival of the contamination. The rotifer assemblages seemed to have recovered after 3 weeks, but the initial levels of diversity and density were not reached again.

  6. Clusters and Financial Resources Management in the Context of the EU Strategy for the Danube Region

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    Mariana Trandafir

    2015-08-01

    Full Text Available Defined by "the co-location of producers, services providers, educational and research institutions, financial institutions and other private and government institutions related through linkages of different types", clusters can be "engines" of global economic development. Beyond the competitive advantages, clusters promote regional specialization in their field of activity, the regions thus becoming different, but interconnected. In the context of intent cluster-ization at European level and at the European Parliament’s call for the “re-industrialization of Europe”, the paper examines the critical role of clusters in the context of the EU Strategy for the Danube Region (SUERD from the financial resources management perspective and it concludes the macro-region of 14 Danube riparian countries, attracting European funds, able to bring prosperity and growth passing through the Danubian innovative clusters. The analysis uses the most recent official data, official documents published by the European Commission and other institutions in the field.

  7. Radiometric and Instrumental Neutron Activation Analysis (INAA) of environmental specimens: lacustrine sediments from Danube Delta

    International Nuclear Information System (INIS)

    Duliu, Octavian G.

    2002-01-01

    The Danube River is the second most important river of Europe. It has a drainage basin estimated as 817 000 km 2 and caries every year between 35 and 70 megatons of solid matter to the Black Sea, where the discharged sediments are forming the present Danube Delta. The Delta continues to grow seaward at a rate of 25 - 35 meters annually. During its history, the evolution of the Danube Delta was closely connected with Danube's three branches: Chilia (the youngest one) in the North, Sulina in the middle and Sf. Gheorghe (the oldest one) in the South. The fluctuation of both Danube River solid flow and the Blake Sea level determined a significant variability of the sediment composition. Now, these sediments mainly consist of silt, sand, shell debris, etc. Former studies has shown that the sedimentation process, occurring over the entire Delta, is characterized by great variability of the sedimentation rates which takes values between 0.6 mm/year and 100 mm/year. The highest sedimentation rate corresponds to the lakes close to the Danube main branches. Therefore, the total thickness of lacustrine sediments varies between 0.5 m in Matita Lake and 2.5 m to 3 m in Lake Golovita. At the same time, as proven by direct and radiographic investigations, the bottom sediments of almost all lakes of the Danube Delta are intensively bioturbated by the living activity of various invertebrates, such as fresh water mollusks and annelid worms, as well as insects (especially chironomid) larvae which spend their life cycle buried in the mud. Despite their variability, sediments represent a sui generis history of past events across the entire catchment basin of a river. Events that refer to actual or passed history such as pollutants discharge, radioactive contamination, climatic changes, etc., could be retrieved by carefully investigation of vertical profile of both trace elements and artificial as well as natural radionuclides. Radiometric as well as high sensitivity and high

  8. 24th International Conference on Robotics in Alpe-Adria-Danube Region

    CERN Document Server

    2016-01-01

    This volume includes the Proceedings of the 24th International Conference on Robotics in Alpe-Adria-Danube Region, RAAD 2015, which was held in Bucharest, Romania, on May 27-29, 2015. The Conference brought together academic and industry researchers in robotics from the 11 countries affiliated to the Alpe-Adria-Danube space: Austria, Croatia, Czech Republic, Germany, Greece, Hungary, Italy, Romania, Serbia, Slovakia and Slovenia, and their worldwide partners. According to its tradition, RAAD 2015 covered all important areas of research, development and innovation in robotics, including new trends such as: bio-inspired and cognitive robots, visual servoing of robot motion, human-robot interaction, and personal robots for ambient assisted living. The accepted papers have been grouped in nine sessions: Robot integration in industrial applications; Grasping analysis, dexterous grippers and component design; Advanced robot motion control; Robot vision and sensory control; Human-robot interaction and collaboration;...

  9. Application of multivariate statistical techniques in the water quality assessment of Danube river, Serbia

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    Voza Danijela

    2015-12-01

    Full Text Available The aim of this article is to evaluate the quality of the Danube River in its course through Serbia as well as to demonstrate the possibilities for using three statistical methods: Principal Component Analysis (PCA, Factor Analysis (FA and Cluster Analysis (CA in the surface water quality management. Given that the Danube is an important trans-boundary river, thorough water quality monitoring by sampling at different distances during shorter and longer periods of time is not only ecological, but also a political issue. Monitoring was carried out at monthly intervals from January to December 2011, at 17 sampling sites. The obtained data set was treated by multivariate techniques in order, firstly, to identify the similarities and differences between sampling periods and locations, secondly, to recognize variables that affect the temporal and spatial water quality changes and thirdly, to present the anthropogenic impact on water quality parameters.

  10. Seasonal Variation of Eutrophication in Some Lakes of Danube Delta Biosphere Reserve.

    Science.gov (United States)

    Török, Liliana; Török, Zsolt; Carstea, Elfrida M; Savastru, Dan

    2017-01-01

      To understand the trophic state of lakes, this study aims to determine the dynamics of phytoplankton assemblages and the main factors that influence their seasonal variation. Sampling campaigns were carried out in three lakes from the Danube Delta Biosphere Reserve. Spectral analysis of specific phytoplankton pigments was applied as a diagnostic marker to establish the distribution and composition of phytoplankton taxonomic groups. Fluorescence spectroscopy was used to quantify changes in dissolved organic matter (DOM). The relative contribution of the main phytoplankton groups to the total phytoplankton biomass and the trend of development during succession of the seasons showed that cyanobacteria could raise potential ecological or human health problems. Moreover, fluorescence spectroscopy revealed that Cryptophyta and cyanobacteria were the main contributors to the protein-like components of DOM. It was concluded that fluorescence could be used to provide a qualitative evaluation of the eutrophication degree in Danube Delta lakes.

  11. Four decades of radioecological research on the Danube river: a reliable basis for protecting the freshwater resources of central Europe of tomorrow

    International Nuclear Information System (INIS)

    Maringer, F.J.

    2000-01-01

    This paper gives a comprehensive review on the radioecological work which has been carried out in the freshwater ecosystem of the Danube by numerous research groups in Central Europe within the last four decades. The review focuses on the essential results and guiding conclusions up to date to support a reliable overview and improved knowledge for solving freshwater radiation protection problems in the future. The atmospheric nuclear weapons testperiod starting in the late fifties brought a large amount of artificial radionuclides in the global water cycle. Since then many radioecological studies and environmental monitoring programs have been performed in the Danube basin. The main objective of all the research and monitoring programs was to assess possible health effects in exposed groups. The second significant contamination of the northern hemisphere, in addition to the relatively insignificant contribution due to the normal operation of nuclear facilities in Central Europe, was the large-scale contamination by the fallout from the Chernobyl accident in 1986. Although the accident brought about a setback for the peaceful use of nuclear energy it increased the knowledge about the radiological impact of radioactive point emissions, meteorological transport phenomena and long-term behaviour of radionuclides in the freshwater environment. In this paper the most important facts for environmental radiation protection problems of large freshwater systems are discussed. Based on this present review an outlook of the most applicable methods and models for environmental monitoring programs, radioanalytical procedures and dose assessments are presented. (author)

  12. The Role of the Nobles-Philanthropists in the Activities of Hospitals in the Danube Region

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    Nataliya Goncharova

    2015-08-01

    Full Text Available Reviews the legal and regulatory basis in the sphere of the guardianship treatment centres in the Russian Empire in the middle of the XIXth century, alleging the establishment of the public supervision over the activities of city, County and provincial hospitals. Contents of the powers of the Trustees, their objectives and main activities. Specific examples in the Danube region proved the thesis that among the Trustees were dominated by representatives of the nobility.

  13. Total mercury concentrations in surface water and sediments from Danube Delta lakes

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    TEODOROF Liliana

    2007-10-01

    Full Text Available The samples were collected from surface water and sediments of Danube Delta lakes, during april and may 2006. The sediments were digested with nitric acid, and the surface water with real aqua, at Microwave Oven Anton Paar and analised at FIMS 400 Perkin Elmer. The results show that the total mercury is compared with the maximum allowed limits according with Normative 161/2006.

  14. Tourist ships on the Danube as an opportunity for export of meat and meat products

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    Tešanović Dragan

    2015-01-01

    Full Text Available Tourism development launches growth of other complementary industries. River tourism, as a special selective tourism form, experiences intensive development, with an importance for all the regions through which the Danube, as an integral part of the Rhine - Main - Danube waterway, flows. During cruising, the largest consumption is achieved on the ship itself, where meat and meat products are an integral element of every meal and represent the most expensive component of the dish. The task of this paper is to analyse the consumption of meat and meat products on six tourist ships run by to 'Grand Circle Corporation' in 2013, in order to point out the possibility of supplying them with meat and meat products from sources in the territory where the ships sail. The paper presents the current suppliers and manufacturers of meat and meat products in Republic of Serbia that could supply the company 'Grand Circle Cruise Line' and other tourist ships that cruise on the Danube. Also, the research indicates that the export of meat products from the Republic Serbia could have a significant effect on improving the agricultural conditions and food production through increased competition, assuming the Serbian manufacturers supply most of tourist ships and not only the six ships analysed in this paper. Research results, specifically, point out the possibility of increasing export of poultry and beef if the potential demand of each of the eight companies with their 54 ships which operate tourist cruises on the Danube is taken into account. The data have been systematized, analysed and presented statistically in tables and graphs.

  15. Carnivorous and omnivorous species of Orthoptera order recorded in the Danube Delta Biosphere Reserve

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    LUPU N. Gabriel

    2007-10-01

    Full Text Available Generally known like have a diet exclusively composed from vegetable, the orthoptera species still surprising by few species whereon the type of the track is different. Some species prefer an omnivorous food regime, which have combination between vegetables and animal protein, other have an exclusively carnivorousfood regime, some species manifesting even cannibalism phenomena. For Danube Delta Biosphere Reservation it was find much more orthoptera species even genre that have an food regime other then one exclusively vegetable.

  16. The ichthyofauna of the shoreline zone in the longitudinal profile of the Danube River, Bulgaria

    Czech Academy of Sciences Publication Activity Database

    Polačik, Matej; Trichkova, T.; Janáč, Michal; Vassilev, M.; Jurajda, Pavel

    2008-01-01

    Roč. 60, č. 1 (2008), s. 77-88 ISSN 0324-0770 R&D Projects: GA MŠk LC522 Grant - others:National Science Fund(BG) B-1510/05 Institutional research plan: CEZ:AV0Z60930519 Keywords : Lower Danube * shoreline zone * fish community * distribution * abundance * endangered species Subject RIV: EH - Ecology, Behaviour http://www.acta-zoologica-bulgarica.eu/downloads/acta-zoologica-bulgarica/2008/60-1-077-088.pdf

  17. The River Danube as an Attraction in Positioning Hotels along its Riverside Capitals

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    Ákos Kátay

    2015-04-01

    Full Text Available The hotel is part of the tourism suprastructure; it provides the conditions of the complex supply set of the people’s temporary home. The most important supply characteristic is the location, because this is the only one that is not changeable after a hotel starts its operation. Therefore, the site of the venue completely determines the hotel’s future successfulness. The aim of the research is to explore how much Danube bank located hotel industry lived with the opportunity of choosing the venue’s establishing location as a potential attraction. The paper also outlines how much these properties use this condition in their marketing and also in selling their products. The research examines those hotels that have no significant built-up area between their property and the Danube that would completely destroy the view of the river. According to the hypotheses of the research these riverside based venues mostly belong to international or regional hotel chains. The economical factor during the planning of the venue is much more important than that all rooms should have a riverside view. In the hotels’ marketing communication the utilization of the Danube appears as an attraction such as its additional value shows up in their price policy. The average room prices of these venues’ are higher than the same capital’s similar star-rated ones without having Danube view. In order to get relevant answers for the above hypotheses authors have a detailed literature review on the development plans and operating reports of the hotel and hospitality industry and examined the involved hotels’ website content analysis, as well.

  18. About architecture of The Headquarters Building of the First Danube Steamboat Shipping Company in Belgrade

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    Drljević Marija

    2007-01-01

    Full Text Available In this work is represented history and described architecture of The Headquarters Building of The First Danube Steamboat Shipping Company in Belgrade. There is a close regard on the earlier research. The work is as well characterized by the attempt to determine architectural style of building with suggestion that it is a combination of a pure modernism with influences of architecture of communal houses in Vienna from 1919 to 1934.

  19. The Upper Miocene rodents from the Pezinok in the Danube Basin, Slovakia

    OpenAIRE

    Peter Joniak

    2016-01-01

    Rodent assemblages are described from two sampled sites at the Pezinok clay pit in the Danube Basin. Although these assemblages contain material poor in specimens, the following eleven rodent taxa are distinguished and described: Progonomys hispanicus, Kowalskia sp., Microtocricetus molassicus, Anomalomys gaillardi, Graphiurops austriacus, Paraglirulus sp., Eomyops catalaunicus, Keramidomys sp., Spermophilinus sp., Albanensia sp. and Euroxenomys minutum. The co-occurrence of very primitive Pr...

  20. Metazoan parasites of Neogobius fishes in the Slovak section of the River Danube

    Czech Academy of Sciences Publication Activity Database

    Ondračková, Markéta; Dávidová, M.; Pečínková, M.; Blažek, R.; Gelnar, M.; Valová, Zdenka; Černý, J.; Jurajda, Pavel

    2005-01-01

    Roč. 21, č. 4 (2005), s. 345-349 ISSN 0175-8659. [European Congress of Ichthyology /11./. Tallinn, 06.09.2004-10.09.2004] R&D Projects: GA ČR(CZ) GP524/05/P291 Institutional research plan: CEZ:AV0Z60930519 Keywords : Nematoda * River Danube Subject RIV: GL - Fishing Impact factor: 0.563, year: 2005

  1. Doubtful records of reptile species in some areas of the Danube Delta Biosphere Reserve (Romania

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    TÖRÖK Zsolt Csaba

    2012-09-01

    Full Text Available In the present paper there are provided details on the doubtful data on the occurrence of some reptile species in various parts of the Danube Delta Biosphere Reserve. Testudo graeca was indicated by mistake at Sfântu Gheorghe (probably the authors saw the species in some places from the continental plateau nearby of Sfântu Gheorghe branch, not inside the Danube Delta. Lacerta viridis was mentioned in the so-called “maritime Delta” and at the ruins of Histria fortress (due to confusion with specimens of Lacerta agilis. Also, Podarcis muralis was “recorded” at the ruins of Histria fortress (due to misidentification of specimens belonging to species P. taurica. A corps of snake found at Letea forest was considered by mistake as belonging to species Eryx jaculus. In several official reports (grey literature the species Elaphe longissima (Zamenis longissimus was mentioned by mistake as occurring at Letea forest. Elaphe (quatuorlineata sauromates was “recorded” at the ruins of Histria fortress and at Sfântu Gheorghe due to confusion with specimens belonging to other snake species. Specimens of Vipera urisnii from the Danube Delta were considered as belonging to the species Vipera berus. Also, Vipera ursinii was metioned by mistake at Caraorman marine levee and at Chituc marine levee, based only on the idea that if the species occurs on other marine levees, it has to be present on these two marine levees, too.

  2. Peculiarities of the Danube Business Environment in the Context of the Sustainable Development

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    Viorica Pușcaciu

    2015-08-01

    Full Text Available The aim of our study intends to be a link between the “green economy” and the “blue economy”, and the objective of it is to analyze the Danube economy in the context of the environment preserving. As the prior works deserve generous space to research regarding the sustainable development concept and experiences and others deal with the Danube problems, our approach tries to build on a link between these two fields of research, and understanding all these problems linked to the Romanian area and trying to find out what are the problems in this sense for our country. The method of research used for our survey is a qualitative one, survey and observation being our tools for fulfillment this approach. The key results and conclusions from this empirical study is that any reader of it could find out how the Danube business environment tries to circumscribe it into the sustainable development percepts. This study could be useful to researchers, administrations, ports authorities, and people interested in this field. The key contribution of this paper might be the interdisciplinary approach of this matter and thus the hope of its originality.

  3. SENTINEL-1/2 DATA FOR SHIP TRAFFIC MONITORING ON THE DANUBE RIVER

    Directory of Open Access Journals (Sweden)

    I. Dana Negula

    2016-06-01

    Full Text Available After a long period of drought, the water level of the Danube River has significantly dropped especially on the Romanian sector, in July-August 2015. Danube reached the lowest water level recorded in the last 12 years, causing the blockage of the ships in the sector located close to Zimnicea Harbour. The rising sand banks in the navigable channel congested the commercial traffic for a few days with more than 100 ships involved. The monitoring of the decreasing water level and the traffic jam was performed based on Sentinel-1 and Sentinel-2 free data provided by the European Space Agency and the European Commission within the Copernicus Programme. Specific processing methods (calibration, speckle filtering, geocoding, change detection, image classification, principal component analysis, etc. were applied in order to generate useful products that the responsible authorities could benefit from. The Sentinel data yielded good results for water mask extraction and ships detection. The analysis continued after the closure of the crisis situation when the water reached the nominal level again. The results indicate that Sentinel data can be successfully used for ship traffic monitoring, building the foundation of future endeavours for a durable monitoring of the Danube River.

  4. The Ways to Optimize the History Education in Ukrainian Danube Region

    Directory of Open Access Journals (Sweden)

    Liliya Tsyganenko

    2014-08-01

    Full Text Available The history education in the Danube region has a long tradition. In 1940 Akkerman Teachersř Institute (later - Izmail State Pedagogical Institute opened the Faculty of History, which lasted until 1950. Revival of the history education in the region occurred in 1991, when at the college, within the Faculty of Ukrainian Philology was resumed training of the historical profile. As an independent faculty of the University the Department of History existed from 2001 to 2011. Demographic problems, poor funding, remoteness from major research centers, the lack of historical perspective of the scientific projects call into question the ability to save in Izmail University the training center for historians of the region. Today there is an urgent need to optimize the approaches and principles of the organization of history education in the Danube region, which should be based on the application of scientific research in the educational process, expanding European integration approaches, joint historical research, frank discussion on relevant and topical issues of the past Bessarabia. As well as the creation by the scientists of Ukraine, Romania, Bulgaria, Moldova joint history textbooks of the Danube region.

  5. Forty years of vegetation change on the Missouri River floodplain

    Science.gov (United States)

    Johnson, W. Carter; Dixon, Mark D.; Scott, Michael L.; Rabbe, Lisa; Larson, Gary; Volke, Malia; Werner, Brett

    2012-01-01

    Comparative inventories in 1969 and 1970 and in 2008 of vegetation from 30 forest stands downstream of Garrison Dam on the Missouri River in central North Dakota showed (a) a sharp decline in Cottonwood regeneration; (b) a strong compositional shift toward dominance by green ash; and (c) large increases in invasive understory species, such as smooth brome, reed canary grass, and Canada thistle. These changes, and others discovered during remeasurement, have been caused by a complex of factors, some related to damming (altered hydrologic and sediment regimes, delta formation, and associated wet-dry cycles) and some not (diseases and expansion of invasive plants). Dominance of green ash, however, may be short lived, given the likelihood that the emerald ash borer will arrive in the Dakotas in 5-10 years, with potentially devastating effects. The prospects for recovery of this valuable ecosystem, rich in ecosystem goods and services and in American history, are daunting.

  6. Hydrological and hydraulic modelling of the Nyl River floodplain Part ...

    African Journals Online (AJOL)

    ... floodplain is a seasonal wetland of great conservation importance in Limpopo Province, South Africa. Water resource developments in the upstream catchments are changing the quantity and timing of water delivery to the floodplain, and this ...

  7. Arsenic in groundwater of the Red River Floodplain, Vietnam

    DEFF Research Database (Denmark)

    Postma, Diederik Jan; Larsen, Flemming; Jessen, Søren

    2007-01-01

    The mobilization of arsenic (As) to the groundwater was studied in a shallow Holocene aquifer on the Red River flood plain near Hanoi, Vietnam. Results show an anoxic aquifer featuring organic carbon decomposition with redox zonation dominated by the reduction of Fe-oxides and methanogenesis....... The concentration of As increases over depth to a concentration of up to 550 μg/L. Most As is present as As(III) but some As(V) is always found. Arsenic correlates well with NH4, relating its release to organic matter decomposition and the source of As appears to be the Fe-oxides being reduced....

  8. Cultural Resources of the Ohio River Floodplain in Illinois,

    Science.gov (United States)

    1977-10-15

    americana), hickories, .nd sweet gum, with occasional black walnut (Juailapns _igrij), butternut (Iluglans cinerea), and pecan ( Carya illinoensis ) on better...Quercius velutina), shingle oak (Quercus imbricaria), and various hickories, particularly the more xeric species such as black hickory ( Carya texana...where soil is thin or exposure hazardous. Stands of various hickories ( Carya ) are interspersed. Smaller trees might include dogwood (Cornus spp.) and

  9. Soil infiltration characteristics in the Tarim River floodplain

    Science.gov (United States)

    Overflow from rivers play an important role for ecological conservation in Tarim Basin, however, there was limited information on infiltration from overflow of the Tarim River. The objective of this study was to investigate steady infiltration rate for three types of land use (forest, shrub and bare...

  10. PAH desorption from river floodplain soils using supercritical fluid extraction

    Czech Academy of Sciences Publication Activity Database

    Yang, Y.; Cajthaml, Tomáš; Hofmann, T.

    2008-01-01

    Roč. 156, č. 3 (2008), s. 745-752 ISSN 0269-7491 R&D Projects: GA MŠk 2B06156 Institutional research plan: CEZ:AV0Z50200510 Keywords : pahs * slow desorption * carbonaceous materials Subject RIV: EE - Microbiology, Virology Impact factor: 3.135, year: 2008

  11. Education and Training Needs in the Field of Local Development in the Lower Danube Macro Region

    Directory of Open Access Journals (Sweden)

    Laurenţiu Tăchiciu

    2010-11-01

    Full Text Available The present paper is the result of an effort made by the authors to explore the needs of education and training in the field of local development, according to the situation in Romanian and Bulgarian Danube bordering regions, aiming at designing joint projects to address such needs between the universities to which authors are affiliated. Local development is here understood as a deliberately induced process of improving the welfare of local communities, which should be democratic, inclusive and sustainable, in particular with regard to creating competitive local economies, stimulating economic growth and ensuring better living conditions for the inhabitants. Local development is an important part of a governance process which involves complex interactions at various territorially defined levels: local, regional, national, cross-national, international. In the case of the regions considered in the present paper a historical opportunity is provided for them by the so called European Union Strategy for the Danube Region. In order to fully exploit this opportunity, the capacity to address local development issues should be strengthened in both countries, especially by well designed education and training programmes. This is why local development was considered a priority topic for the cooperation between the two universities. In the same framework, taking into consideration the challenges which are specific to the Lower Danube Region, other topics of interest were considered: logistics, tourism, consumer affairs or rural development. The authors of the present paper had to avoid overlapping with the work of the other teams. In particular, there are many common points between local development and rural development, because in both countries the regions on the border of Danube are predominately rural and significantly dependent on agriculture. Therefore, here, the needs for education and training are defined in strict correlation with the required

  12. Fauna parasitária de Leporinus lacustris e Leporinus friderici (Characiformes, Anostomidae da planície de inundação do alto rio Paraná, Brasil - DOI: 10.4025/actascibiolsci.v28i3.228 Parasite fauna of Leporinus lacustris and Leporinus friderici (Characiformes, Anostomidae from the upper Paraná river floodplain, Brazil - DOI: 10.4025/actascibiolsci.v28i3.228

    Directory of Open Access Journals (Sweden)

    Ricardo Massato Takemoto

    2007-11-01

    Full Text Available Foram investigadas as faunas parasitárias de Leporinus lacustris e Leporinus friderici da planície de inundação do Alto rio Paraná, Brasil, objetivando compará-las em composição e estrutura das comunidades seguindo-se metodologias usuais no estudo dos parasitas. Foram observados alguns padrões e as faunas podem ser consideradas semelhantes em estrutura. A principal diferença nas faunas parasitárias refere-se às taxas diferenciais de utilização das espécies hospedeiras por algumas espécies parasitas em comum, representadas pela abundância. Esse indicador diferiu entre as espécies de peixes mostrando que, apesar delas serem hospedeiras apropriadas, sua exploração ocorre de forma distinta.The parasite fauna of Leporinus lacustris and Leporinus friderici from the Upper Paraná River floodplain, Brazil, was investigated aiming to make a comparison in terms of composition and structure of the communities. Usual methodologies in the study of parasite fauna were applied. Some patterns were observed, and the faunas can be considered similar in structure. The main difference in the parasite fauna was the use rate of the host by some shared parasite species, represented by abundance. This indicator differed in the fish species showing that, although all are appropriate hosts, their exploitation occurs in different ways.

  13. Use of historical sources in a study of the 1895 floods on the Danube River and its tributaries

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    Melo Marián

    2014-01-01

    Full Text Available Hydrological data series that are measured on the Danube River are temporally limited. Instrumental flow data can be prolonged by documentary data from historical sources in archives. This paper deals with knowledge gained by studies of historical materials regarding the 1895 catastrophic floods on the Danube River and its tributaries as reflected in the contemporary local press and also in studies of other historical records (flood marks, chronicles, books and photos. Records from the newspapers (Wiener Zeitung, Preßburger Zeitung, The New York Times and Komáromi Lapok and other analysed sources show the relatively large territorial impact of the floods in March and April 1895, which affected not only the Danube and its tributaries, but also some neighboring basins. Catastrophic consequences of the flood were especially reported from the lower parts of the Danube River (from its confluence with the Drava River up to the mouth of the Black Sea and the tributaries of the Tisza and Sava rivers. In 1895, the second highest flood after the 2006 flood on the Lower Danube was observed since 1841.

  14. The Tito-Stalin Conflict and its Political Consequences over the International Regime of the Danube River

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    Arthur Tuluş

    2015-07-01

    Full Text Available The discrepancies arisen between the two totalitarian communist leaders - – Joseph Vissarionovici Stalin (The Soviet Union and Josip Broz Tito (Yugoslavia – contained in themselves the seed of destruction of the political and economic Stalinist monopoly regarding the Danube. Our study proposes to identify, through scientific analysis of contemporary sources of the event, the aftermath of this conflict regarding the political evolution of the international regime of the Danube, as well as the manner in which the dissolution of the communist bloc affected the post-war international relations. Between 1948 and 1953, until the death of Stalin, the conflict blocked the Danube for both communist states from the river's basin as well as in terms of international trade that characterized the previous period (interwar. Stalin viewed the Danube River as a factor of influence and political pressure that meant to subordinate the small communist states. After Stalin's death (March 1953, Khrushchev had to make a series of major concessions regarding Yugoslavia and other communist states which led to the transformation of the international regime of the Danube and to a "thaw" between East and West.

  15. Correlations of natural radionuclides in soil with those in sediment from the Danube and nearby irrigation channels

    International Nuclear Information System (INIS)

    Krmar, M.; Varga, E.; Slivka, J.

    2013-01-01

    The correlation between activity concentrations of some natural radionuclides ( 238 U, 226 Ra, 232 Th, 40 K) measured in soil and in sediment taken from the Danube River and nearby irrigation channels was studied. The soil samples were collected from the northern part of Serbia and the sediment from the Serbian part of the Danube River and from the surrounding irrigation channels. The correlation between 238 U and other natural radionuclides in irrigation channel sediments was not as good as in the Danube. One of the possible explanations for this weak correlation can be the different chemical dynamics of 238 U in the irrigation channel sediment or changes of the 238 U activity concentration in irrigation channel sediment due to some human activities. The evaluation of ratios of activity concentrations of some natural radionuclides could be a more sensitive method for the determination of contaminant, rather than the straightforward analysis of activity concentrations. -- Highlights: ► 238 U, 232 Th and 40 K were measured in soil, Danube and surrounding channel sediment. ► Correlation of activity concentrations were observed. ► In cannel sediment natural radionuclides are not well correlated as in Danube one. ► Ratios of 238 U, 232 Th and 40 K can be good indicator for TENORM monitoring

  16. Climate change adaptation options for sustainable management of agriculture in the Eastern Lower Danube Plain, Romania

    Science.gov (United States)

    Popovici, Elena-Ana; Sima, Mihaela; Balteanu, Dan; Dragota, Carmen-Sofia; Grigorescu, Ines; Kucsicsa, Gheorghe

    2013-04-01

    The current study was carried out within the FP7 ECLISE project in the Eastern Lower Danube Plain (Bărăgan Plain), one of the major agricultural areas in Romania. In this region, climate change signals are becoming more evident being predominantly characterized by increasing temperatures, decreasing of precipitations and intensification of extreme events in terms of frequency, intensity and duration. Over the past decades, the effects of extreme climatic phenomena on crop production have been ever more severe (very low outputs in the droughty years, significant crop losses during flooding periods, hailstorms, etc.). Concurrently, these effects have been the result of a whole range of complex interactions with other environmental, social, economic and political factors over the post-communist period. Using questionnaires survey for small individual households and large agricultural farms, focus group interviews and direct field observation, this study analyses the farmers' perception in terms of climate change, the impact of climate change on agriculture and how the farmers react and adapt to these changes. The current study have revealed that all farmers believe drought as being by far the most important climatic factor with major impact on agricultural production, followed by acid rains, hail storms and ground frost, facts evidenced also by the climatic diagnosis of the region. The majority of respondents have taken adaptation agricultural measures in response to changes in climate conditions (drought resistant seeds, modern technology to keep the moisture in the soil, etc.), but they consider that a national strategy for mitigating the effects of climate change would be more effective in this respect. Also, in order to correlate the farmers' perception of climate change and climatic factors, the authors used and processed a wide range of meteorological data (daily, monthly and annual from the most representative meteorological stations in the study-area), as

  17. Regeneração natural em remanescentes florestais e áreas reflorestadas da várzea do rio Mogi-Guaçu, Luiz Antônio - SP Natural regeneration in forest remainders and reforested areas of "Mogi-Guaçu" river floodplain in Luiz Antônio county, São Paulo, Brazil

    Directory of Open Access Journals (Sweden)

    Assíria Maria Ferreira da Nóbrega

    2008-10-01

    > 10 cm and diameter at breast height (DBH < 5.0 cm were measured and analyzed separately in four height classes according to floristic diversity, similarity, density, frequency, dominance, importance value and natural regeneration. A total of 2,010 individuals were identified, belonging to 24 families, 46 genera and 51 species. The species with greater importance values were Cabralea canjerana, Psidium cattleyanum, Nectandra megapotamica, Acacia polyphylla and Syzygium cumini, well represented in the four height classes. Reforestation with native species in a degraded Mogi-Guaçu River floodplain promoted natural regeneration with more biodiversity than in natural remainders submitted to border effect, and contributed to the forest ecosystem restoration process. The 20-year-old Eucalyptus robusta plantation promoted the regeneration of climax and secondary species.

  18. Caracterização trófica da ictiofauna de três lagoas da planície aluvial do alto rio Paraná, Brasil Trophic characterization of ichthyofauna from three lagoons of the Upper Paraná river floodplain, Brazil

    Directory of Open Access Journals (Sweden)

    Luiz Carlos Gomes

    2001-05-01

    Full Text Available Com o objetivo de avaliar a composição da ictiocenose de lagoas da planície aluvial do alto rio Paraná em relação às categorias tróficas, foram realizadas coletas nas lagoas Figueira, Genipapo e Pousada, em março/1999. Após as capturas e obtenção dos dados biométricos, os peixes foram eviscerados e os estômagos fixados em formol 4%. Os conteúdos estomacais foram analisados pelos métodos de freqüência de ocorrência e volumétrico combinados no Índice Alimentar (IAi. Foram amostradas 40 espécies, as quais foram agrupadas em 10 categorias tróficas, ou seja, detritívora, iliófaga, zooplanctófaga, algívora, carcinófaga, piscívora, insetívora, bentófaga, herbívora e onívora. Para a lagoa Pousada, foram importantes, em número, as categorias zooplanctófagas (48,31%, na lagoa Genipapo foram os iliófagos (74,96%, enquanto que para a lagoa Figueira algívoros sobressaíram, com 75,58% da captura, s. Em relação à biomassa, observou-se que detritívoros foram dominantes na lagoa Pousada (45,7% e lagoa Figueira (27,7%, enquanto que na lagoa Genipapo predominaram os iliófagos (90,0%. Registrou-se alta disponibilidade de camarões nas três lagoas, embora estes tenham sobressaído apenas na dieta dos peixes da lagoa Figueira (20,7%. Embora a maior distância entre as três lagoas seja inferior a 1km, elas são submetidas a diferentes níveis de influência do rio Paraná, e apresentam fisiografias distintas e composições ictiofaunísticas diversas. Além disso, várias espécies icticas apresentam dietas distintas conforme a lagoa considerada, revelando papeis distintos na cadeia trófica desses ambientesIchthyofauna from three lagoons of the upper Paraná River floodplain was evaluated according to trophic categories. Samples were obtained in the Figueira, Genipapo, and Pousada lagoons in March 1999. Stomach contents were analyzed according to methods of occurrence and volumetric frequency, combined in an alimentary

  19. Radioactivity measurements of the Danube area taken by the Federal Institute of Water Quality during 1975-1978

    International Nuclear Information System (INIS)

    Frantz, A.

    1980-01-01

    A review is given of the gross-β-, K- and gross-α-activity of the Austrian section of the river Danube, measured by the Federal Institute of Water Quality in Vienna during 1975 - 1978. The results of the tributaries to the Danube: Inn, March and Leitha are even discussed. Beside water samples the activity level in acquatic biota such as plankton, resp. seston, algae, fontinalis and fish as well as in grass and soil was studied. The investigations showed, that the radioactive burden of the Danube and her tributaries and especially the maxima of activity have slightly decreased from 1975 to 1978 corresponding to the decrease in number and force of the Chinese nuclear weapon tests. (author)

  20. What does nature have to do with it? Reconsidering distinctions in international disaster response frameworks in the Danube basin

    Science.gov (United States)

    McClain, Shanna N.; Secchi, Silvia; Bruch, Carl; Remo, Jonathan W. F.

    2017-12-01

    This article examines the international policy and institutional frameworks for response to natural and man-made disasters occurring in the Danube basin and the Tisza sub-basin, two transnational basins. Monitoring and response to these types of incidents have historically been managed separately. We discuss whether the policy distinctions in response to natural and man-made disasters remain functional given recent international trends toward holistic response to both kinds of disasters. We suggest that these distinctions are counterproductive, outdated, and ultimately flawed, illustrate some of the specific gaps in the Danube and the Tisza, and conclude by proposing an integrated framework for disaster response in the Danube basin and Tisza sub-basin.

  1. What does nature have to do with it? Reconsidering distinctions in international disaster response frameworks in the Danube basin

    Directory of Open Access Journals (Sweden)

    S. N. McClain

    2017-12-01

    Full Text Available This article examines the international policy and institutional frameworks for response to natural and man-made disasters occurring in the Danube basin and the Tisza sub-basin, two transnational basins. Monitoring and response to these types of incidents have historically been managed separately. We discuss whether the policy distinctions in response to natural and man-made disasters remain functional given recent international trends toward holistic response to both kinds of disasters. We suggest that these distinctions are counterproductive, outdated, and ultimately flawed, illustrate some of the specific gaps in the Danube and the Tisza, and conclude by proposing an integrated framework for disaster response in the Danube basin and Tisza sub-basin.

  2. The Danube so colourful: A potpourri of plastic litter outnumbers fish larvae in Europe's second largest river

    International Nuclear Information System (INIS)

    Lechner, Aaron; Keckeis, Hubert; Lumesberger-Loisl, Franz; Zens, Bernhard; Krusch, Reinhard; Tritthart, Michael; Glas, Martin; Schludermann, Elisabeth

    2014-01-01

    Previous studies on plastic pollution of aquatic ecosystems focused on the world's oceans. Large rivers as major pathways for land-based plastic litter, has received less attention so far. Here we report on plastic quantities in the Austrian Danube. A two year survey (2010, 2012) using stationary driftnets detected mean plastic abundance (n = 17,349; mean ± S.D: 316.8 ± 4664.6 items per 1000 m −3 ) and mass (4.8 ± 24.2 g per 1000 m −3 ) in the river to be higher than those of drifting larval fish (n = 24,049; 275.3 ± 745.0 individuals. 1000 m −3 and 3.2 ± 8.6 g 1000 m −3 ). Industrial raw material (pellets, flakes and spherules) accounted for substantial parts (79.4%) of the plastic debris. The plastic input via the Danube into the Black Sea was estimated to 4.2 t per day. - Highlights: • Here we first report on abundance and composition of plastic litter in a large river. • The mass and abundance of drifting plastic items in the Austrian Danube are higher than those of larval fish. • The plastic input of the River Danube into the Black Sea is estimated to 4.2 t per day. - 1) More plastic items than larval fish are drifting in the Austrian Danube. 2) The Danube is a major pathway of land-based plastics waste into the Black Sea

  3. CAPITALISATION OF NATURAL RESOURCES FOR TOURISM PURPOSES IN THE DANUBE DELTA

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    IOAN ILDIKO

    2015-06-01

    Full Text Available The Danube Delta outstands by a number of characteristics that outline its uniquiness at national, regional and world level, pattern that is recognized by its multiple natural reserve status (biosphere reserve, Ramsar site, UNESCO natural heritage site, Natura 2000 site. Despite major technical works that were prior performed for the development of transportation, agriculture, and mining in the Danube Delta, the territory still preserves untamed ecosystems that create breath-taking landscapes and allow a powerful transformative experience of wilderness with major sustainability education potential for its visitors. Meanwhile, traditional economic activities are declining and local communities are experiencing mainly the drawbacks of remoteness instead of harnessing the valuable opportunities born within the current economic trends that emphasize the need to capture the positive externalities of well-preserved natural ecosystems. The Danube Delta is already a well-known tourism destination, but this status still fails to improve local wellbeing. Thus the richness of natural resources is conflicting with the wellbeing of communities with most of the people living at the edge of poverty. This “resource curse” like situation is the main reason that motivates our study that envisages outlining how tourism development and management could create the economic capacity that delivers prosperity for local communities without jeopardising the conservation goals of the natural reserve. In this respect we revisited a number of characteristics of tourism potential, tourism indicators, patterns of tourism products, and the current tourism management. This analysis revealed that there are a number of positive trends, but also the need to strengthen the measures that support high value added tourism products that allow avoiding the threat of numerous visitors and the development of mass tourism infrastructure. The relevance of these conclusions is limited by

  4. Expansion of the marbled crayfish in Slovakia: beginning of an invasion in the Danube catchment?

    Directory of Open Access Journals (Sweden)

    Boris Lipták

    2016-01-01

    Full Text Available The marbled crayfish, Procambarus fallax f. virginalis, is a taxon widely available in the aquarium pet trade, which has been introduced to open waters in several European countries and in Madagascar. Recent studies confirmed this parthenogenetically reproducing crayfish as a high-risk invasive species, and vector of the crayfish plague pathogen, Aphanomyces astaci. It has been first discovered in Slovakia in 2010, but the status of the local population was not studied since then. Due to enlarged sampling area around the first report and one locality, where we presupposed the crayfish occurrence, we identified new marbled crayfish populations. Here, we report presence of three newly established marbled crayfish populations in Slovakia. Two populations are located critically close to the Váh River, a major tributary of the Danube River; one of them being directly connected to the Váh River via a side channel during occasional floods. The third established marbled crayfish population was found at the mouth of a thermal stream flowing into the Nitra River, a tributary of the Váh River. In this stream, crayfish coexist with other exotic fish and gastropod species of aquarium origin. We presume that the reported localities may serve as a source for further expansion of the marbled crayfish in the mid-part of the Danube catchment. Floods, active dispersal (including overland, passive dispersal by zoochory or anthropogenic translocations are among the major drivers facilitating the marbled crayfish colonization. We have not detected the crayfish plague pathogen in any of the studied populations. However, if spreading further, the marbled crayfish will encounter established populations of crayfish plague carriers in the Danube River, in which case they may acquire the pathogen by horizontal transmission and contribute to spread of this disease to indigenous European crayfish species.

  5. The Danube – Mythical Space in the Literary Text (Voiculescu V. and Meniuc G.

    Directory of Open Access Journals (Sweden)

    Victoria Fonari

    2014-08-01

    Full Text Available From the perspective of the space the myth of the water is the specific one, which, trough its fluidity comes close to the myth of the air and also, through the dynamic force draws close to the myth of the fire, opposed to the earth which is the sign of stability. Studying the myth, we will approach to the image of Danube in the literary texts of Vasile Voiculescu and of George Meniuc. Both authors are tempted to absorb the own experiences through the phantasmagorical images, where the reality blends skillfully with the imagination, water having the function to cross the being into another world which is so little known. For V. Voiculescu, the water can be placed neither in the past, nor in the future, it lives in the circle time. It holds the secret of destiny. Even if it seems predictable, it contains the mysteries that can not be definitively perceived. For V. Voiculesc the river lends the poem which links the man to the aquatic life. Thus the fisherman, Amin, is convinced that he comes from the sturgeon, just like the old Santiago, the character from the novel of Ernest Hemingway, who is united with the porpoises and the flying fish. G. Meniuc is the artist who kept artistically silent in the fiftyřs in MSSR, being suspected during his life of the beginning of his literary career in the interwar period. That is why, Danube represents the space of the knowledge, of a freedom that combines the contemplation, the decoding and the memory. By the Danube (Reni and Tulcea G. Meniuc reveals the Romanian ethnic space.

  6. Determination of mercury and methylmercury in fishes of the Danube caught 1977 in Upper Austria

    International Nuclear Information System (INIS)

    Teherani, D.K.; Stehlik, G.; Tehrani, N.; Hinteregger, J.

    1977-09-01

    In 22 fishes from the Upper Austria part of the Danube mercury was determined by means of atomic absorption spectroscopy after a chemical pretreatment. 6 fishes from these also were proved in regard to their methylmercury content. About 40% of these fish smples showed Hg-concentrations of<=0,2 ppm, 50% of 0,21 - 0,5 ppm and 10% 0f 0,51 -1,03 ppm. The fraction of methylmercury in 6 fishes amounted between 6 and 72% of the total mercury content. (author)

  7. Seasonal variations of bisphenol A in the Danube River by the municipality of Novi Sad, Serbia

    Directory of Open Access Journals (Sweden)

    Milanović Maja

    2016-01-01

    Full Text Available Seasonal variations of bisphenol A (BPA were investigated in the Danube along the Novi Sad bank, Serbia using solid-phase extraction followed by gas chromatographic mass spectrometric method. The obtained results confirmed the presence of BPA above the limit of quantification (6 ng/L in 22 out of 32 water samples at all eight sampling sites. Тhe BPA concentration varied from 1 for autumn, spring and summer. The high potential risk which is attributed to the elevated summer concentrations is probably the result of the increased human activates and weather conditions. [Projekat Ministarstva nauke Republike Srbije, br. III46009

  8. The significance of the Danube ecological corridor in the proceedings of implementing ecological networks in Serbia

    Directory of Open Access Journals (Sweden)

    Filipović Dejan

    2015-01-01

    Full Text Available With the modern processes for exploiting land people have altered the original appearance of areas and created cultural environments. The remaining natural environments, whether protected or not, take up a relatively small portion of space and represent isolated islands which in itself can not be sufficient for the preservation of biodiversity or for the fulfillment of national, regional or international goals and commitments related to their preservation. In order to secure the preservation of biodiversity, the strengthening of integrity and the natural processes, such as animal migrations, succession of vegetation and evolution processes, the communication between natural habitats is imperative. Ecological corridors, as integral elements of ecological networks, ensure the preservation of vital ecological interactions by providing a connection between different habitats or areas. Depending on a range of factors, from the fulfillment of demands of different species to the connecting of regions, corridors of local, sub-regional, regional and international importance are identified. The Danube ecological corridor is one of the most significant corridors of international importance which encompasses a large number of habitats which are part of the natural watercourse of the corridor. There are numerous protected areas in the Danube coastal area on Serbia's territory which present themselves as central areas for forming the ecological network, such as: Gornje Podunavlje, Karađorđevo, Fruška Gora, Titelski Breg hill, Kovalski rit marsh, Dunavski loess bluffs, the Sava mouth, Labudovo okno, Deliblato sands, Đerdap and Mala Vrbica. The diverse and mosaic vegetation of the floodplain, as well as the consistency of the protected areas within the Danube corridor have a direct influence on the quality and functionality of this corridor. The goal of this paper is to show the significance of the Danube ecological corridor in the process of implementing

  9. Investigation of the heavy metal pollution of Danube delta sediments by TTPIXE analysis

    International Nuclear Information System (INIS)

    David, I.; Ciortea, C.; Enescu, S.; Fluerasu, D.; Dumitriu, D. E.; Dinescu, L.; Stochioiu, A.

    2001-01-01

    The elemental composition of sediments collected from some Danube Delta lakes (Malita, Furtuna, Lund, Mester and Sinoe), which are located in active sedimentary zones, was investigated by using two complementary methods: thick target proton-induced X-ray emission (TTPIXE) and instrumental neutron activation analysis (INAA) or X-ray fluorescence (XRF). The goal was to obtain a complete survey of heavy metal pollution and reconstruct recent pollution history in these Danube Delta lakes. Vertical distribution was analyzed, except for the case of Sinoe Lake, from which samples were collected only at the surface. During PIXE measurements, the pellets of 12 mm diameter and ∼ 1.5 mm thickness were bombarded using 3 MeV proton beams delivered by the FN-Tandem accelerator of IFIN-HH. The X-ray spectra were measured with a Ge-HP detector of 180 eV/5.9 KeV energy resolution for some micro.C charge accumulation. Control samples of reference sediments (IAEA, SL-1 and SOIL-7) prepared in the same conditions were also measured. Corrections were made for proton stopping and X-ray self-attenuation in the thick samples. Thirty-eight samples from the first four lakes and 7 samples from Sinoe Lake were analyzed, and the concentrations of 27 elements in every sample were determined by TTPIXE method. The following elements: S, Ca, Ti, Mn, Ni, Ga, Pb, and Hg could not be determined by INAA in our conditions. A typical measured spectrum where the presence of various pollutant elements is shown. Five elements - As, Br, Cr, Sb and Zn - were identified as pollutants by INAA method, showing concentrations about 1.5-2 x larger at the sediments surface. The vertical distribution of the presumed pollutant elements generally reflected the pollution history of the Danube Delta, namely a steady increase in pollution till the end of the 1980s, which can be associated with intense industrialization of Central and Eastern European countries prior to 1990. We think the interplay with TTPIXE method

  10. Checklist of non-indigenous fish species of the River Danube

    Directory of Open Access Journals (Sweden)

    Zorić Katarina

    2014-01-01

    Full Text Available Twenty non-indigenous fish species were recorded in the Danube River. The manner of their introduction, vectors, pathways, as well as invasive status are discussed. The major modes of introduction and translocation were found to be aquaculture and fish stocking. The main environmental consequences of the spread of alien fish are related to changes in the structure and functioning of the fish community and to the introduction of non-indigenous parasites. [Projekat Ministarstva nauke Republike Srbije, br. ON 173025, TR 37009 and III 43002 and European Commission 6th Framework Program: Integrated Project ALARM (contract GOCE-CT-2003-506675

  11. Radioactivity of fish in the Hungarian reach of the river Danube

    International Nuclear Information System (INIS)

    Kurtacs, E.

    1982-01-01

    In connection with the Hungarian nuclear power program a series of measurements was initiated to detect radionuclides in fishes of Danube river at two sampling points near the station region. The beta activity of samples was counted with anticoincidence shielded low background Tesla NZ-602 type apparatus. The radioactivity of samples was measured after simple physical or radiochemical preparation. The results show no significant difference according either to sampling sites of seasons. Activity concentrations of 90 Sr and 137 Cs of natural or global fallout origin are low and hardly differ from values obtained earlier by other researchers. (author)

  12. The discharge of certain amounts of industrial microplastic from a production plant into the River Danube is permitted by the Austrian legislation

    International Nuclear Information System (INIS)

    Lechner, Aaron; Ramler, David

    2015-01-01

    Numerous studies have quantified the amount of plastic litter in aquatic ecosystems and tried to assess its impacts and threats. This reflects a rising awareness of plastic as an environmental problem. As a next logical step, identifying and regulating the sources must be in the focus of scientific efforts. We report on a spillage of industrial microplastic (IMP) from a production plant situated at an Austrian Danube tributary. This is the first identified point source of IMP litter in freshwater systems. However, due to generous thresholds established by the Austrian government substantial amounts of IMP are legally introduced into running waters. - We report on the first documented case of microplastic spillage from a manufacturing site

  13. Hydrological and Morphological Changes of the Lower Danube Near Mohács, Hungary

    Directory of Open Access Journals (Sweden)

    Nagy Judit

    2016-06-01

    Full Text Available Various direct human impacts changed the hydro-morphology of the Danube during the last centuries. The aims of the present study are (1 to analyze the water regime of the Danube River using the data of Mohács gauging station (1900-2013, and (2 to study the channel development (1952-2014 in connection with water regime changes and human impacts at a section near Bogyiszló (upstream of Mohács. According to the results the height of low water stages decreased by approx. 136 cm (1.2 cm/year, and new, high record flood stages were measured too. The discharge values appertaining to the same low water stages doubled, thus nowadays almost twice as much water flows through the cross-section of the channel at a given stage as at the beginning of the studied period. As the duration of low stages increased, the sandbar development intensified, thus the channel became narrower (by 48% at some places and deeper thalweg evolved. Therefore, a smaller cross-section for flood-waves evolved, affecting the height of flood. These changes affect shipping, as due to riverbed incision and decrease of low water stages, the lowest shipping water level has to be set repeatedly at lower stages. Besides water extraction from the channel will have difficulties, thus irrigation and industrial cooling water supply will be limited in the future.

  14. Detection of changes in flow variability of the upper Danube between 1876-2006

    International Nuclear Information System (INIS)

    Pekarova, Pavla; Miklanek, Pavol; Halmova, Dana; Skoda, Peter; Pekar, Jan

    2008-01-01

    It is widely acknowledged that global warming will result in an increased extremality of hydrological phenomena. As for streamflow it is anticipated that duration of low-flow conditions and flood frequency will both increase. Approving this hypothesis by statistically evaluating daily runoff characteristics depends on the availability of long and homogeneous data series. The aim of this paper is to analyze the change of the average daily flows of the Danube at Bratislava for different subsets of the period 1876-2006. The statistical tests did not reveal any increase in the extremality of daily runoff over the period 1876-2006. On the contrary, variability of daily flows of the Danube River decreases. Over the last 30 years streamflows increased in the winter-spring season and decreased in the summertime, compared to the past periods. This can be explained by the higher air temperature in the headwaters. A warmer climate causes an earlier onset of snowmelt in the winter-spring season, thus less runoff is observed in the summer with higher rates of precipitation.

  15. Radiocesium cumulation in selected fishes in the Czechoslovak stretch of the Danube river

    International Nuclear Information System (INIS)

    Cipakova, A.; Mitro, A.; Smidt, I.; Wirdzek, S.

    1987-01-01

    The contents were measured of 137 Cs and 134 Cs in the bodies, scales, viscera and gonades of different species of fish caught in the river Danube in September 1986. The highest specific activity of the two radionuclides in the edible parts of the fishes was found in Esox lucius, namely 71.9 Bq.kg -1 and 31.8 Bq.kg -1 , respectively. The lowest values were measured in Chondrostoma nasus, i.e., 24.5 and 11.2 Bq.kg -1 , and Barbus barbus 18.8 and 7.9 Bq.kg -1 . Also calculated were transfer coefficients. Presented and compared are the values of specific activity of the two radionuclides in the individual organs of the caught fish and the dose commitment for the individual body organs of persons consuming the fish caught in the Danube river in the years 1978 and 1986. As compared with 1978, the 137 Cs specific activity in the body organs of the fishes increased by two orders of magnitude, dose commitment of human organs from consumption of these fishes also increased. However, the said increased values are still 5 order of magnitude lower than is the annual limit set by Czechoslovak standards. (J.B.). 5 tabs., 7 refs

  16. CARACTERISTICS OF THE LOWER DANUBE WATER BODIES BETWEEN PORTILE DE FIER

    Directory of Open Access Journals (Sweden)

    Elena ŢUCHIU

    2010-12-01

    Full Text Available The main goal of the Water Framework Directive (2000/60/EC Directive is the achievement of the “good status” of the water bodies, environmental objective which can be reached through elaboration and implementation of the River Basin Management Plan. According to the legal requirements, at the 22nd of December 2009, Romania has elaborated the first National Management Plan – synthesis of the River Basin Management Plans. This process assumes the types identification and water bodies delineation on the basis of some abiotic and biotic parameters, such: water category, abiotic and biotic typology, physical features, water status, pressures and their impacts, as well as protected areas. Therefore, for the lower Danube sector between Bazias and Isaccea 4 water bodies have been delineated: 2 reservoirs (Portile de Fier/Iron Gates and Ostrov and 2 river sectors (Ostrov – Chiciu, Chiciu – Isaccea. The procedure for assessment of the environmental objectives risk failing (on the basis of pressures and impacts has shown that all 4 water bodies have been identified at risk from the point of view of organic substances, nutrients, hazardous substances and hydro-morphological alterations. The Water Framework Directive defines the surface water status through: the ecological status - 5 classes (based on biological, hydro-morphological and physic-chemical elements and chemical status – 2 classes (based on priority substances. In present, the 4 water bodies identified on the lower Danube sector do not reach the good status, being designated as heavily modified water bodies.

  17. STUDY REGARDING TO AGGRESSIONS ON THE ECOSYSTEM DANUBE DELTA – BLACK SEA AND PROTECTIVE MEASURES

    Directory of Open Access Journals (Sweden)

    Ion Gr. IONESCU

    2014-06-01

    Full Text Available Danube Delta has suffered damages of habitat and species loss caused by factors, including: construction of dams upstream have degraded obviously flooding regime; creation of agricultural and fishing enclosures which decreased the natural and original surfaces; extending artificial navigation channels that negatively affected the hydrological regime and water quality of lakes; increase of nutrients in the water, industrial pollution and accumulate effluents that led to the reduction of plant and bird species; attempt to exploit quartz sand, very pure and fine, the sea levees, although they were protected as nature reserves because of the specific morphology and sub-Mediterranean vegetation covering them; tourism and illegal fishing; mismanagement of resources of reed and fish. The fact is that there was a slight improvement for the marine ecosystem, reported since the early 90s. At present, the area of the Danube Delta - Black Sea is developing sustainable, in terms of medium and economic perspective. In my study I used comparative methods, investigations, direct observations, measurements, calculations and actual data, obtained from surveys and direct observations, from prestigious, specialized and authorized institutions.

  18. Actual contamination of the Danube and Sava rivers at Belgrade (2013

    Directory of Open Access Journals (Sweden)

    Antonijević Milan D.

    2014-01-01

    Full Text Available This study is focussed on a comprehensive investigation on the state of pollution of Danube and Sava rivers in Belgrade region. Different complementary analytical approaches have been used covering both (i organic ccontaminants in river water by target analyses of hormones and neonicotinoids as well as non-target screening analyses and (ii heavy metals in sediments. Finally, some common water quality parameters have been analysed. The overall state of pollution is on a moderate level. Bulk parameters did not reveal any unusual observation. Also quantification of preselected organic contaminants did not point to elevated pollution. A more significant contamination was measured for chromium, nickel, zinc and partially copper in sediments with values above target values according to Serbian regulations. Lastly, non-target screening analysis revealed a wider spectrum of organic contaminants comprising pharmaceuticals, technical additives, personal care products and pesticides. The study presented a comprehensive view on the state of pollution of Sava and Danube rivers and is the base for setting up further monitoring programs. As a superior outcome it has been illustrated how different chemical analyses can point to different assessments of the river quality. The comparison of target and non-target analyses pointed to potential misinterpretation of the real state of pollution.

  19. Water quality in Danube Delta Lakes: An assessment using benthic macroinvertebrates community

    Directory of Open Access Journals (Sweden)

    IBRAM Orhan

    2016-12-01

    Full Text Available An assessment of the ecological status of selected lakes in the Danube Delta Biosphere Reserve was done based on temporal and spatial variation of macroinvertebrate communities during 2012 and 2013. Macroinvertebrate communities and measures of these communities were evaluated and a baseline characterization of assemblages was determined for the analyzed sites. Each year, three sampling campaigns, one for each ice-free season were organized for data collection. Macroinvertebrate samples have been collected in every lake from three different stations with the use of an Ekmann dredge. The highest taxa richness are recorded in Fortuna and Isac lakes in 2013. Total abundance followed a pattern similar to taxa number with Fortuna and Isac lakes having the highest yearly values (maximum number of individuals – 225 - per sample has been recorded in September 2013, in Isac Lake.Using saprobic index as an indicator of ecological status Isac lake was classifies as moderate and other three lakes, Merhei, Furtuna and Rosu as good ecological status. Lack of correlation between diversity indices and the saprobic values suggests that other assessment methods could be more effective and provide better information than saprobic index does at least for Danube Delta.

  20. The textile and clothing industry in the Danube region countries: Comparative advantages

    Directory of Open Access Journals (Sweden)

    Ignjatijević Svetlana

    2016-01-01

    Full Text Available The subject of this study is the analysis of comparative advantages of international export in the TC (textile and clothing industry of the Danube region countries with a special focus on Serbia. The aim of this study is to analyze the comparative advantage and suggest possible economic and legal measures to strengthen export. This study observed export per capita and participation of TC industry export, and measured the comparative advantage and specialization of the Danube region countries in the period between 2005 and 2013. In the course of research, we used the Balassa (RCA and Lafay (LFI indexes of comparative advantage, and the GL index and RUV index of horizontal and vertical specialization in intra-industry exchange. The research has revealed positive comparative advantage in the export of the textile industry in the Czech Republic, Germany and Slovenia. In the clothing industry export, positive comparative advantage was revealed in the cases of: Bulgaria, Hungary, Moldova, Romania, Slovakia and Serbia. The research has shown a positive comparative advantage of the TC industry sector in Serbia. The results of our research into the TC industry reveal the existence of correlation between comparative advantage and intra-industry specialization in international trade.

  1. Characteristics of the tritium distribution in the Danube basin region in Yugoslavia

    International Nuclear Information System (INIS)

    Hadzisehovic, M.; Buraei, K.; Zupancic, M.; Pongrac, S.; Spasova, D.; Milojevic, A.; Urosevic, V.; Ristic, M.

    1982-01-01

    The investigated water samples were collected from rivers, underground waters and precipitations at different locations near Belgrade during the period 1976-1979. By preconcentration and scintillation counting, the individually and monthly collected samples were analyzed for 3 H content. It has been found that the 3 H-concentration in monthly river water samples (Danube, Sava, Tisa) varies from 39 to 196 TU with a maximum in summer, between 0-192 TU in the underground waters depending on the sampling depth and distance from river Sava and Danube, while values of 26 to 153 TU have been detected in the monthly precipitation samples attaining a maximum during the break-through of arctic and polar continental air masses. The results were used to calculate the 3 H quantity deposited per m 2 (Bq/m 2 ) of surface, due to precipitations and the flow per second (Bq/s) in the investigated locations in rivers. The interrelation between rivers, underground waters and precipitations is disussed. The 3 H-distributions obtained are correlated with the water level in rivers and with the precipitation quantities and are interpreted in light of the relevant meteorological parameters and other related phenomena. (author)

  2. Management applications of genetic structure of anadromous sturgeon populations in the Lower Danube River (LDR, Romania

    Directory of Open Access Journals (Sweden)

    ONĂRĂ Dalia Florentina

    2013-12-01

    Full Text Available During the last decades, the over-exploitation of sturgeon stocks for caviar production simultaneously with severe habitat deteriorations has led to drastic declines in the natural populations of the Danube River. As a result of (i decrease of sturgeon catches from 37.5 tons in year 2002 to 11.8 tons in year 2005, (ii disrupted age class structure of sturgeon adult cohorts in years 2003 and 2004, and (iii lack or low recruitment in the period 2001 – 2004, in 2005 the Romanian Government started the Supportive Stocking Program of Lower Danube River with hatchery-produced young sturgeons in Romania. Subsequently, in 2006 the commercial sturgeon fishing in Romania was banned for a 10-year period. Genetic investigations were undertaken as an attempt to assess the genetic variability of the sturgeon brood fish, captured from the wild, used in two aquaculture facilities in Romania for obtaining juveniles for supportive stocking of LDR with young sturgeons produced by artificial propagation in year 2007. Our data indicate strong genetic diversity in case of stellate sturgeon and lack of diversity within the batch of beluga sturgeon brood fish captured in 2007, analyzed in the current study. Specific measures that could improve the management plan of sturgeon brood fish in the Romanian part of LDR in the light of recent FAO guidelines regarding the sturgeon hatchery practices and management for release were suggested

  3. Lifelong Learning and Employability in the Danube Region Countries: Influences and Correlations

    Directory of Open Access Journals (Sweden)

    Constanţa-Nicoleta Bodea

    2016-08-01

    Full Text Available A continuous challenge for education and lifelong learning is to assist individuals in acquiring skills and knowledge for successful work life, especially after the financial crisis which influenced negatively the employment growth in all European Union countries. The paper focuses on finding correlations between employability and lifelong learning in the Danube Region countries of the European Union and more explicitly in the ex-communist ones of this region. As research instruments, two online questionnaires were built based on a thorough literature review and a set of structured interviews and filled in by 390 IT students and 55 IT professors. The surveys’ results revealed a clear positive correlation between the level of education and the opinion about the importance of obtaining a job as a result of the educational endeavors. A special attention in the survey was given to social networks, which were acknowledged as modern facilitators of lifelong learning activities. The conclusions of the current study are particularly important in the Romanian context, as the employment rate of recent graduates is in a decreasing trend, but also for all the Danube Region ex-communist countries, which have to boost their employment rates as well, to assure their economical growth. Identification of factors stimulating employment of young people according with their education contributes at the sustainable economic growth of these countries, at the growth of graduates insertion in the labor market and at the diminution of labor migration.

  4. Newborns health in the Danube Region: Environment, biomonitoring, interventions and economic benefits in a large prospective birth cohort study

    Czech Academy of Sciences Publication Activity Database

    Andersen, Z.J.; Šrám, Radim; Ščasný, M.; Gurzau, E.S.; Fucic, A.; Gribaldo, L.; Rössner ml., Pavel; Rössnerová, Andrea; Kohlová, M.B.; Máca, V.; Zvěřinová, I.; Gajdošová, D.; Moshammer, H.; Rudnai, P.; Knudsen, L. E.

    2016-01-01

    Roč. 88, mar. (2016), s. 112-122 ISSN 0160-4120 Institutional support: RVO:68378041 Keywords : birth cohort * environment * biomonitoring * air pollution * danube region * childhood health Subject RIV: EB - Genetics ; Molecular Biology Impact factor: 7.088, year: 2016

  5. The recent distribution and abundance of non-native Neogobius fishes in the Slovak section of the River Danube

    Czech Academy of Sciences Publication Activity Database

    Jurajda, Pavel; Černý, J.; Polačik, Matej; Valová, Zdenka; Janáč, Michal; Blažek, R.; Ondračková, Markéta

    2005-01-01

    Roč. 21, č. 4 (2005), s. 319-323 ISSN 0175-8659 R&D Projects: GA ČR GP524/05/P291 Institutional research plan: CEZ:AV0Z60930519 Keywords : fish * River Danube Subject RIV: EG - Zoology Impact factor: 0.563, year: 2005

  6. Population structure, condition, and reproduction characteristics of native monkey goby, Neogobius fluviatilis (Actinopterygii: Perciformes Gobiidae), in the Bulgarian Danube

    Czech Academy of Sciences Publication Activity Database

    Konečná, Markéta; Jurajda, Pavel

    2012-01-01

    Roč. 42, č. 4 (2012), s. 321-327 ISSN 0137-1592 R&D Projects: GA ČR(CZ) GAP505/11/1768 Institutional support: RVO:68081766 Keywords : monkey goby * invasion * Bulgaria * Danube, condition * GSI * ovary structure Subject RIV: EH - Ecology, Behaviour Impact factor: 0.606, year: 2012

  7. A review of Gobiid expansion along the Danube-Rhine corridor – geopolitical change as a driver for invasion

    Czech Academy of Sciences Publication Activity Database

    Roche, Kevin Francis; Janáč, Michal; Jurajda, Pavel

    2013-01-01

    Roč. 411, 01 (2013), 01 ISSN 1961-9502 R&D Projects: GA ČR(CZ) GAP505/11/1768 Institutional support: RVO:68081766 Keywords : Gobiidae * Danube * Rhine * range expansion * drivers Subject RIV: EH - Ecology, Behaviour Impact factor: 0.622, year: 2013

  8. The harmoniation of cultural heritage and architectural conseration needs with socio-economic requirements of rural habitat in Danube Delta

    Directory of Open Access Journals (Sweden)

    SELA Florentina

    2016-12-01

    Full Text Available The paper present a study of cultural heritage of rural landscape in Danube Delta Biosphere Reserve focuses on cultural landscapes that reflect traditional lifestyle of the locals, activities of deltas’ resource sustainable exploitation, creating visual elements in the rural landscape, especially on traditional buildings, fishermens’ temporary shelters from fishing areas and other traditional activities. In order to highlight the necessity of cultural heritage harmonization and architectural conservation with the socio-economic requirements of rural habitat in Danube Delta were made some field activities through different methods of field investigation, like structured and semistructured interviews, questionnaires, focus groups. In Danube Delta villages, the changes imposed by the touristic function of most of existing or new construction have produced important changes in the architectural landscape of existing settlements impending danger of destroying traditional architectural values which demonstrates on the one hand the personality and inovation spirit of local people in their constructions, particularly in the use of local materials, and on the other hand gives a specific area feature that blends perfectly with the natural landscape. Danube Delta, the space of complex features in terms of cultural values, characterized as open gate of cultural interference, is the area that can provide options to balance cohabitation and cultural heritage.

  9. Trophic gradients in a large-river delta: Ecological structure determined by connectivity gradients in the Danube Delta (Romania)

    NARCIS (Netherlands)

    Coops, H.; Buijse-Bogdan, L.L.; Buijse, A.D.; Constantinescu, A.; Covaliov, S.; Hanganu, J.; Ibelings, B.W.; Menting, G.; Navodaru, I.; Oosterberg, W.; Staras, M.; Torok, L.

    2008-01-01

    There are over 300 lakes interconnected by riverbranches and man-made canals in the Danube Delta (Romania). A multidisciplinary survey of these riverine lakes situated in large Wetland complexes was made comprising hydrological modelling, remote sensing and monitoring of water quality, plankton,

  10. Data concerning the epidemiological characteristics in the helminth infestations of the Danube Delta’s cormorant populations

    Directory of Open Access Journals (Sweden)

    RĂILEANU Ştefan

    2007-10-01

    Full Text Available This study is focused on the elucidation of some aspects regarding the endo- and ecoparasite fauna specific for the Danube Delta’s cormorants. The researches on the two species of cormorants (Phalacrocorax carbo and Phalacrocorax pygmaeus had as main purpose the specification of the helmitofauna’s etiology, epidemiology and micro- ecology present to the 2 studied species.

  11. The Danube and the Sava in Strabo’s Geography and in Roman Inscriptions

    Directory of Open Access Journals (Sweden)

    Marjeta Šašel Kos

    2010-12-01

    Full Text Available The Danube, once considered the most important river of Europe, is referred to by Strabo in several passages. Of the greatest interest is the information recorded in his Book 7, which is largely dedicated to the Balkan peninsula and to the adjacent regions. The Danube as an important boundary river is mentioned at the very beginning of the book, which defines the geographical extent of the area. The importance of the Danube as one of the largest rivers was already perceived by Herodotus, who describes the Ister as the most important of all rivers known to him and locates its source somewhere in the west. Its sources are a day’s walk away from Lake Constance and were discovered by Tiberius only in 15 B.C. – another fact recorded by Strabo. A similar evaluation of the Danube’s importance was made c. 150 years later by the historian Appian, who provides a surprising amount of geographical data. He broaches the subject in his very introduction, stating that the Roman Empire is largely circumscribed by two European rivers, the Rhine and the Ister: the Rhine flows into the northern ocean, and the Ister into the Black Sea. But there are peoples who are under Roman control even beyond these rivers: some groups of Celts beyond the Rhine, and some groups of the Getae named ‘Dacians’ beyond the Ister (Fig. 1.  Strabo generally refers to the river by its Thracian name, Ister, fully established among the Greeks. In Book 7, however, he explains that it has two names and that the upper section is usually called Danuvius.Danuvius/Danubius is probably a Celtic name, which referred to the river down to the cataracts at the so-called Železna vrata (‘Iron Gates’ under Singidunum (Belgrade. It was only towards the end of the 1st century B.C., when their conquering campaigns finally reached these parts, that the Romans realised it was a single river. The Scythian name for the Danube was Matoas. In Roman times, the Danube was worshipped and

  12. Genetic variation in brown trout Salmo trutta across the Danube, Rhine, and Elbe headwaters: a failure of the phylogeographic paradigm?

    Science.gov (United States)

    Lerceteau-Köhler, Estelle; Schliewen, Ulrich; Kopun, Theodora; Weiss, Steven

    2013-08-26

    Brown trout Salmo trutta have been described in terms of five major mtDNA lineages, four of which correspond to major ocean basins, and one, according to some authors, to a distinct taxon, marbled trout Salmo marmoratus. The Atlantic and Danubian lineages of brown trout meet in a poorly documented contact zone in Central Europe. The natural versus human mediated origin of the Atlantic lineage in the upper Danube is a question of both theoretical and practical importance with respect to conservation management. We provide a comprehensive population genetic analysis of brown trout in the region with the aim of evaluating the geographic distribution and genetic integrity of these two lineages in and around their contact zone. Genetic screening of 114 populations of brown trout across the Danube/Rhine/Elbe catchments revealed a counter-intuitive phylogeographic structure with near fixation of the Atlantic lineage in the sampled portions of the Bavarian Danube. Along the Austrian Danube, phylogeographic informative markers revealed increasing percentages of Danube-specific alleles with downstream distance. Pure Danube lineage populations were restricted to peri-alpine isolates within previously glaciated regions. Both empirical data and simulated hybrid comparisons support that trout in non-glaciated regions north and northeast of the Alps have an admixed origin largely based on natural colonization. In contrast, the presence of Atlantic basin alleles south and southeast of the Alps stems from hatchery introductions and subsequent introgression. Despite extensive stocking of the Atlantic lineage, little evidence of first generation stocked fish or F1 hybrids were found implying that admixture has been established over time. A purely phylogeographic paradigm fails to describe the distribution of genetic lineages of Salmo in Central Europe. The distribution pattern of the Atlantic and Danube lineages is extremely difficult to explain without invoking very strong

  13. Geochronology of priority pollutants in sedimentation zones of the Volga and Danube delta in comparison with the Rhine delta

    International Nuclear Information System (INIS)

    Winkels, H.J.; Kroonenberg, S.B.; Lychagin, M.Y.; Marin, G.; Rusakov, G.V.; Kasimov, N.S.

    1998-01-01

    Six sediment cores were taken in sedimentation zones of the Volga river (located in the southern part of the Russian Federation) and, additionally, 6 sediment cores were taken in several lakes (sedimentation zones) in the central and western part of the Danube delta in Romania. Priority pollutants (8 metals, 7 polychlorinated biphenyls and 10 polycyclic aromatic hydrocarbons) were determined in all samples of all cores. Present-day and historical levels of pollutants since the late 1930s were established through the use of radionuclide time tracers ( 137 Cs, 134 Cs). For the persistent metals and polycyclic aromatic hydrocarbons, trends in the concentration profiles during the last 5 decades are described. Low and hardly changing concentrations of As, Cu, Zn and all studied PAHs were observed during the last five decades in the sediments of the Volga river. Recently deposited sediments show slightly increasing levels for the heavy metals Zn and Cr and As in the Volga delta. For the studied metals and PAHs, maximum concentrations were found around 1987 in the sediments of the Danube delta. Sediments deposited around 1940 and recently deposited sediments in the Danube delta showed lower pollutant levels. If the contents of heavy metals, PAHs and PCBs in the aquatic sediments in the deltas of the rivers Rhine, Danube and Volga are compared, it is clear that the Volga delta is and was the cleanest delta during the last 5 decades. Nowadays the contents of heavy metals (except Cu and Ni), PAHs and PCBs in the aquatic sediments of the river Rhine are still highest compared to the other two rivers. The recent load of heavy metals (except Cd and Zn) in the sediments of the river Danube is the highest compared to the other two rivers. (Copyright (c) 1998 Elsevier Science B.V., Amsterdam. All rights reserved.)

  14. Enterobacteriaceae Isolated from the River Danube: Antibiotic Resistances, with a Focus on the Presence of ESBL and Carbapenemases.

    Science.gov (United States)

    Kittinger, Clemens; Lipp, Michaela; Folli, Bettina; Kirschner, Alexander; Baumert, Rita; Galler, Herbert; Grisold, Andrea J; Luxner, Josefa; Weissenbacher, Melanie; Farnleitner, Andreas H; Zarfel, Gernot

    2016-01-01

    In a clinical setting it seems to be normal these days that a relevant proportion or even the majority of different bacterial species has already one or more acquired antibiotic resistances. Unfortunately, the overuse of antibiotics for livestock breeding and medicine has also altered the wild-type resistance profiles of many bacterial species in different environmental settings. As a matter of fact, getting in contact with resistant bacteria is no longer restricted to hospitals. Beside food and food production, the aquatic environment might also play an important role as reservoir and carrier. The aim of this study was the assessment of the resistance patterns of Escherichia coli and Klebsiella spp. out of surface water without prior enrichment and under non-selective culture conditions (for antibiotic resistance). In addition, the presence of clinically important extended spectrum beta lactamase (ESBL) and carbapenmase harboring Enterobacteriaceae should be investigated. During Joint Danube Survey 3 (2013), water samples were taken over the total course of the River Danube. Resistance testing was performed for 21 different antibiotics. Samples were additionally screened for ESBL or carbapenmase harboring Enterobacteriaceae. 39% of all isolated Escherichia coli and 15% of all Klebsiella spp. from the river Danube had at least one acquired resistance. Resistance was found against all tested antibiotics except tigecycline. Taking a look on the whole stretch of the River Danube the proportion of multiresistances did not differ significantly. In total, 35 ESBL harboring Enterobacteriaceae, 17 Escherichia coli, 13 Klebsiella pneumoniae and five Enterobacter spp. were isolated. One Klebsiella pneumoniae harboring NMD-1 carbapenmases and two Enterobacteriaceae with KPC-2 could be identified. Human generated antibiotic resistance is very common in E. coli and Klebsiella spp. in the River Danube. Even isolates with resistance patterns normally associated with intensive

  15. MAIZE YIELD AND ITS STABILITY AS AFFECTED BY TILLAGE AND CROP RESIDUE MANAGEMENT IN THE EASTERN ROMANIAN DANUBE PLAIN

    Directory of Open Access Journals (Sweden)

    Alexandru COCIU

    2015-10-01

    Full Text Available Rainfed crop management systems need to be optimized to provide more resilient options in order to cope with projected climatic scenarios which are forecasting a decrease in mean precipitation and more frequent extreme drought periods in the Eastern Romanian Danube Plain. This research, carried out in the period of 2011-2014, had as main purpose the determination of influence of tillage practices and residue management on rainfall use efficiency, maize yield and its stability, in order to evaluate the advantages of conservation agriculture (CA in the time of stabilization of direct seeding effects, in comparison with traditional chisel tillage. The maize grain yields are presented for each crop management practices, as follows: (1 chisel tillage, retained crop residues being chopped and incorporated (ciz; (2 zero tillage, retained crop residue chopped and kept on the field in short flat condition (rvt; (3 zero tillage, crop residues kept on the field in short root-anchored condition (1/2rva, and (4 zero tillage, crop residues kept on the field in tall root-anchored condition (1/1rva. In 2012, a year with prolonged drought during vegetative growth, yield differences between zero tillage with short root-anchored residue retention (1/2rva and chisel tillage with residue incorporation (ciz were positive, up to 840 kg ha-1. In average over 2011-2014, conservation agriculture (CA practices had a yield advantage over traditional chisel tillage practice. Zero tillage with residue retention used rainfall more efficiently so suggesting that it is a more resilient agronomic system than traditional (conventional practices involving chisel tillage with residue incorporation.

  16. ORCONECTES LIMOSUS COLONISES NEW AREAS FAST ALONG THE DANUBE IN HUNGARY

    Directory of Open Access Journals (Sweden)

    PUKY M.

    2006-01-01

    Full Text Available Introduced species are one of the most important anthropogenic impacts on freshwater ecosystems with many direct and indirect effects on native taxa. Among other invasive groups, such as plants, mussels and fish, several alien Decapoda species have also spread successfully in Europe in the last 110 years. In Hungary three native (Astacus astacus, Astacus leptodactylus, Austropotamobius torrentium and three alien Decapoda species, namely Orconectes limosus, Pacifastacus leniusculus and Eriocheir sinensis are known to be present. O. limosus, which had been tried for use in crayfish farming in the 1950s, was the first to occur in the country’s natural waters. Initially it was found in the Danube at river km 1,653 at Budapest in 1985. Since then, it has been spreading fast and populations have reached high abundances. By 1998, it was already in the Gemenc section of the river colonising five 50 km × 50 km UTM squares. In the early 2000s it was also found at Mohács (and further downstream in Croatia, in canals in the Great Hungarian Plain and in the River Ipoly, which added three new 50 km × 50 km UTM squares to its previously known distribution area in the Carpathian Basin. On the basis of the available records from the past 20 years, the downstream colonisation speed of this decapod was calculated to be more than 13 km yr–1, but if its presence at Kopácsi rét/Kopacki rit in Croatia is also taken into consideration, it is over 16 km yr–1. It is unknown, however, how much this process was helped by deliberate introductions, if at all. Besides the main watercourse of Hungary, O. limosus is also common in its lowland tributaries and spreading towards Lake Balaton along the Sió canal. However, it has not been recorded entering mountain streams in the Danube Bend, where A. torrentium lives, which is important for the conservation of that native species. If O. limosus spreads with the same speed and distribution pattern in the Carpathian Basin

  17. Field experiment on excess air formation in the riverbank of Danube

    International Nuclear Information System (INIS)

    Palcsu, L.; Major, Z.; Aeschbach-Hertig, W.

    2007-01-01

    Complete text of publication follows. Excess air is a contribution to the gases dissolved in groundwater in addition to the solubility equilibrium component, formed by partial or total dissolution of air trapped during water level rises in the unsaturated zone. The amount of excess air can be quite large, mainly if the water level increase is significant. The first aim of this field experiment carried out in September 2007 during a flood (Fig. 1/b) occurred along the Danube River has been to demonstrate that the excess air formation can be detected and studied under natural conditions when the groundwater level is rising. The study site is located in the riverbank of Danube River, the dug-well is at around 30 m from the riverbed (Fig. 1/a). The whole area is composed of fluvial sand. Separated water samples can be taken from the sampling tubes. Each sampling tube represents a certain depth. The horizontal groundwater flow velocity is supposed to be around 10 m/day (or at least this magnitude), that of course depends on the level difference between Danube and the groundwater. Helium and neon concentrations have been measured from the water samples. What we can see from these noble gas data is a probable correlation between groundwater level and excess noble gas concentrations. He and Ne are correlating providing evidence that the excess components are of same origin. However, the helium excess is usually larger than that of neon that means there has to be non atmospheric components of helium, such as terrigenic and tritiogenic. The R/Ra ratios are generally higher than one clearly showing tritiogenic 3 He in the water. Having a look at Fig. 1/b-c, it can be observed that there is a relatively good relation between groundwater rising and the excesses of the noble gases. From this sampling campaign, we can conclude that this kind of field experiment does make sense. Further noble gases have to be measured, and more information has to be gained regarding to the local

  18. A multimodel approach to interannual and seasonal prediction of Danube discharge anomalies

    Science.gov (United States)

    Rimbu, Norel; Ionita, Monica; Patrut, Simona; Dima, Mihai

    2010-05-01

    Interannual and seasonal predictability of Danube river discharge is investigated using three model types: 1) time series models 2) linear regression models of discharge with large-scale climate mode indices and 3) models based on stable teleconnections. All models are calibrated using discharge and climatic data for the period 1901-1977 and validated for the period 1978-2008 . Various time series models, like autoregressive (AR), moving average (MA), autoregressive and moving average (ARMA) or singular spectrum analysis and autoregressive moving average (SSA+ARMA) models have been calibrated and their skills evaluated. The best results were obtained using SSA+ARMA models. SSA+ARMA models proved to have the highest forecast skill also for other European rivers (Gamiz-Fortis et al. 2008). Multiple linear regression models using large-scale climatic mode indices as predictors have a higher forecast skill than the time series models. The best predictors for Danube discharge are the North Atlantic Oscillation (NAO) and the East Atlantic/Western Russia patterns during winter and spring. Other patterns, like Polar/Eurasian or Tropical Northern Hemisphere (TNH) are good predictors for summer and autumn discharge. Based on stable teleconnection approach (Ionita et al. 2008) we construct prediction models through a combination of sea surface temperature (SST), temperature (T) and precipitation (PP) from the regions where discharge and SST, T and PP variations are stable correlated. Forecast skills of these models are higher than forecast skills of the time series and multiple regression models. The models calibrated and validated in our study can be used for operational prediction of interannual and seasonal Danube discharge anomalies. References Gamiz-Fortis, S., D. Pozo-Vazquez, R.M. Trigo, and Y. Castro-Diez, Quantifying the predictability of winter river flow in Iberia. Part I: intearannual predictability. J. Climate, 2484-2501, 2008. Gamiz-Fortis, S., D. Pozo

  19. A preliminary analysis of the fish communities' dynamic in the Slovak section of the Danube in last two decades

    International Nuclear Information System (INIS)

    Jakubcinova, K.; Kovac, V.

    2015-01-01

    The Danube is the river with the highest richness of fish species (102 species reported) in Europe. Nevertheless, it also faces various human pressures with serious negative impacts on its ecosystems, including fish communities. In this work, data from The Joint Danube Survey 2 (2007), The Joint Danube Survey 3 (2013) and the Gabcikovo Hydroelectric Scheme Monitoring (GHS) (1991-2011) were analyser briefly. The Fish Index of Slovakia (FIS) was used to compare the Cunovo - Szap section, which is under the influence of GHS, with the section of Danube in Bratislava, which is upstream to GHS. Significantly lower values of FIS indicate the negative impact of GHS on local fish communities. However invasive species have also impacted fish communities negatively. (authors)

  20. Designing a cartographic online application in order to assess the Danube Delta evolution

    Directory of Open Access Journals (Sweden)

    ILIE Codrina Maria

    2012-09-01

    Full Text Available The Danube Delta, one of the most important wetlands in Europe, went through many transformations during the last century, mainly due to human interference. When analyzing the current state of this ecosystem, one must consider the historical changes that have a significant influence on the evolution of the delta. Written documents are, no doubt, valuable, but a fundamental contribution is given by the study of geospatial information (old maps, satellite images etc. These information depict the ecosystems components state at a specific time and analyzing them in a successive manner allows one to extract information, that otherwise would be difficult to perceive, such as patterns of evolution. Another important aspect that could be resolved through the use of historical maps is the evolution of human settlements and the toponymy.

  1. La gestion des aires critiques: le delta du Danube entre isolement et réserve

    Directory of Open Access Journals (Sweden)

    Lucian Dobraca

    1999-03-01

    Full Text Available La création d'une réserve de la biosphère dans le delta du Danube a compliqué les rapports fragiles homme-environnement. L'espace du delta, structuré par les activités liées à l'eau, avait été bouleversé par des aménagements peu respectueux de l'environnement (1960-1989. La mise en place d'une administration écologiste en 1991 (objectifs scientifiques, valorisation dans la logique du développement durable, actions de contrôle et de protection a limité l'ampleur des dégâts de l'environnement, mais a multiplié les contraintes pour la vie humaine.

  2. The level of invasion of the willow-poplar floodplain forests of Danube lowland

    International Nuclear Information System (INIS)

    Botkova, K.; Petrasova, K.

    2015-01-01

    Invasions of neophyte plant species are considered as one of the major threats to the diversity of natural ecosystems including floodplain forests. The aims of our study were to find out if there is a significant increase in the number and cover of neophyte species in the willow-poplar floodplain forests of Danube lowland over time. The level of invasion of the willow-poplar floodplain forests was evaluated from 1950 to the present time using Kruskal-Wallis non-parametric ANOVA. According to the analysis results, along the time gradient there is a significant increase in the number and cover of neophytes among analysed periods. This result is not caused by increasing biodiversity, because the number of native species significantly decreased. Therefor it is necessary to look for reasons of this situation in deteriorating condition of floodplain biotopes. (authors)

  3. Qualitative inventory of fish fauna from Danube River around Cama Dinu islets

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    NASTASE Aurel

    2006-09-01

    Full Text Available The purpose of fish fauna inventory was to find out scientific grounds that protected species are present and need declaration of Cama Dinu islets as protected area. The inventory was undertaken in June 2004, by fish sampling, questionnaires and fishery observation. A number of 55 out of 65 species reviewed from Romanian and Bulgarian authors have found. The Danube River has valuable ecologically fish species to justify declaration of Cama Dinu islets as protected area according with Romanian Law 462/2001: 12 species which conservation need establish of protected area - annex 3; 4 species that need a strict protection - annex 4; 9 species of European Community interest that need special management measures.

  4. Education and Training Needs in the Field of Consumer Protection in the Lower Danube Region

    Directory of Open Access Journals (Sweden)

    Vasile Dinu

    2010-11-01

    evaluate the requirement for education and training in the field of consumer protection in the Lower Danube Region, we decided to collect and study the necessary information, both at EU level as well as those specific to the counties bordering the Danube, information which sustain the need for the establishment of a new form of expert training in this field. As a result, the paper brings up aspects regarding the need for training AE Education and Training Needs in the Field of Consumer Protection in the Lower Danube Region Amfiteatru 710 Economic experts in the field of consumer protection, referring to the Romanian counties bordering the Danube and neighbouring Bulgaria. Also, this report presents the findings of a research project whose aim is to evaluate the availability of prerequisites for seeking educational products in the field of consumer protection in Bulgaria. The institutional framework of the process in Bulgaria has been analyzed and the results of a survey among the representatives of the four parties involved in it – government authorities, NGOs, consumers and suppliers – have been presented. The research presents their point of view regarding the extent to which the process of consumer protection in Bulgaria is developed, what are the major obstacles it faces, what means of improvement are there, to what extent the more active offer of educational products would facilitate the process and based on this, what would the role played by the institutions of higher education be, what types of educational products would best be realized on the market in a short-term and medium term aspect. The motivation for such research is related both to the strive to improve the status of the consumer rights protection in Bulgaria and the intention of Tsenov Academy of Economics in Svishtov, Bulgaria and the Academy of Economic Studies in Bucharest to collaborate towards intensifying the cross-border co-operation and facilitate the human resource development in the region

  5. Aquatic macrophytes from Danube Delta lagoons Musura Bay and Zatonul Mare

    Directory of Open Access Journals (Sweden)

    Sava D.,

    2016-05-01

    Full Text Available The Romanian Danube Delta, a unique, young and continuing to grow region situated in the eastern part of Europe, is the largest continuous marshland and the second largest delta on the continent, and also a favorable place for developing a unique flora and fauna in Europe, with many rare and protected species. The predominance of the aquatic environment, led to the existence of a particular macrophytic flora. In this context, the purpose of this paper is to contribute to the study of aquatic macrophytes. The present study took place over two years, between 2013-2014, and in each year a number of expeditions were made in the two lagoons (Musura Bay and Zătonul Mare in different seasons, in order to observe the diverse flora, because, due to seasonal variation in water quality, there might be a significantly seasonality of the vegetation also.

  6. Benthic Macroinvertebrate Communities in the Northern Tributaries of the “Iron Gates” Gorge (Danube River

    Directory of Open Access Journals (Sweden)

    Curtean-Bănăduc Angela

    2014-12-01

    Full Text Available The paper presents the structure of the benthonic macro-invertebrates communities in the Berzasca, Sirinia, Liubcova, and Mraconia rivers. The results are based on quantitative benthos samples (95 samples, collected in July 2014 from 19 sampling stations within the study area. In longitudinal profile, the benthonic macro-invertebrate communities of the Sirinia, Liubcova and Berzasca rivers displays relatively large structural variability, while the communities of the Mraconia River displays smaller structural variability. The structure of the benthonic macro-invertebrate communities correlated with the biotope characteristics indicates the good ecological status of the analysed rivers, with the exception of the Berzasca River sector downstream of the town of Berzasca and immediately upstream of the Danube junction, a sector with moderate ecological status due to negative effects from man-made modifications in the lotic biotope of the sector.

  7. Danube river bonds. Past, present, future - a dimension of time and space

    International Nuclear Information System (INIS)

    1997-01-01

    The conference dealt with future of bio-environment and the development of the countries through the Danube river flows . The topics of the conference were: (1) The expected extension of the European Union - new profiles in the management and the diplomacy; (2) The economic transformation: connection of the market, the laws and the culture; (3) Bio-diplomacy and bio-ethics: the chapters from the history; (4) The commerce, transport, tourism and communication: the new trends in the international collaboration; (5) The development of the river -bio-diversion, history and the culture; (6) The bio-education and the academic politics; (7) The encounter of the interests at the projection, construction and exploitation of the water ways and water plants; (8) The modern concepts of the protection before pollution and protection of the natural sources; (9) The forest ecosystems and soils protection; (10) Legislative standards in the water economy

  8. Radioactive contamination of filamentous green algae in the Hungarian reach of the river Danube

    International Nuclear Information System (INIS)

    Holland, E.; Sztanyik, L.B.; Vanicsek, L.

    1982-01-01

    In accordance with the Hungarian nuclear power program, river water monitoring techniques should be developed. From among algae of various species of river Danube the localized and well-propagating filamentous green algae (Cladophora sp.; Vaucheria sp.) were investigated. The activity concentration of gamma-radiating nuclides absorbed by algae was determined with a Canberra 8100 type Ge(Li)-spectrometer. This apparatus facilitated radioactivity measurements on wet samples or samples subjected to simple physical preparation. The metabolic character and accumulative abilities of filamentous green algae showed that they are suitable indicators of radionuclide contamination of the water ecosystem. 131 I nuclide at min. 72.5 mBq/g to max. 5440.0 mBq/g, and other fission products from 55 mBq/g to 929 mBq/g were observed. (author)

  9. Radioactive contamination of filamentous green algae in the Hungarian reach of the river Danube

    Energy Technology Data Exchange (ETDEWEB)

    Holland, E.; Sztanyik, L.B.; Vanicsek, L. (Orszagos Frederic Joliot-Curie Sugarbiologiai es Sugaregeszseguegyi Kutato Intezet, Budapest (Hungary))

    1982-01-01

    In accordance with the Hungarian nuclear power program, river water monitoring techniques should be developed. From among algae of various species of river Danube the localized and well-propagating filamentous green algae (Cladophora sp.; Vaucheria sp.) were investigated. The activity concentration of gamma-radiating nuclides absorbed by algae was determined with a Canberra 8100 type Ge(Li)-spectrometer. This apparatus facilitated radioactivity measurements on wet samples or samples subjected to simple physical preparation. The metabolic character and accumulative abilities of filamentous green algae showed that they are suitable indicators of radionuclide contamination of the water ecosystem. /sup 131/I nuclide at min. 72.5 mBq/g to max. 5440.0 mBq/g, and other fission products from 55 mBq/g to 929 mBq/g were observed.

  10. Investigation of the radioactive and heavy metal pollution of the danube Delta lacustrine sediments and soil

    International Nuclear Information System (INIS)

    Dinescu, L.C.; Ciortea, C.; Fluerasu, D.; Stoica, P.; Duliu, O.G.; Stoica, P.

    2005-01-01

    Results obtained for five lacustrine sediment cores and three soil samples, collected in 1996 from Danube Delta, by using INAA, ICP-MS, and TTPIXE analytical methods, are presented. The measured vertical profiles identified as possible pollutants the following elements: Al, Cu, Zn, As, Ag, Cd, In, Sn, Sb, Hg, Tl, Pb, and Bi. In the sediment cores, the determined elements, except V and Ni, show near-surface enrichment relative to the lower part (1.3-3 enrichment factor, except 5 - 7 for Cd and Hg). In some few cases, As, Cd, Cu, Cr, Mn, and Pb exceeded the minimum threshold of safety defined by the Romanian legislation. For soil samples, increased (1.5-3 times) values at surface in comparison with the 30 cm depth was also found, but values much lower compared to lacustrine sediments, indicating the riverine transport as the main source of heavy-metal near-surface contamination of the lacustrine sediments

  11. Explanatory Factors of the Expansion of Recreation Function on the Bank of Danube River in Budapest

    Directory of Open Access Journals (Sweden)

    Pál Szabó

    2015-10-01

    Full Text Available In a city's development a river and riverbank played important role, however in recent decades the functions of them have changed, transformed, especially in major cities in the more developed countries, so the city administration was faced with a new phenomenon and geographical space: the changing riverbanks, and the utilization, development, revitalization of them has become a key issue. The various real processes showed the direction that these areas should be provided to the people, and the recreation service will be important for the local residents and tourists. Overall, the urban waterfront development is an increasingly important researched topic and policy. The question is: can we realize it in Budapest also nowadays? In recent years, those processes took place in Budapest, which resulted in an increasing utilization of the Danube and its banks for recreational functions. On the one hand, local social and economic processes have led to the waterfront sites released, on the other hand the needs of the residential population and tourists using the river and the riverside for recreational purposes have increased, and thirdly, the new city administration decided to renew the banks of the Danube, mainly to create new recreational areas. In this paper, we analyze these three factors, focusing on a past short period, because there is an exceptional cohesion between the processes, the needs and the new development goals. Two case studies are in the paper also: the Margaret Island as the oldest traditional recreational area in Budapest, and the Kopaszi-dam, as the newest and successful recreational area of Budapest. The analysis of the processes is based on data and literature, the analysis of the needs is based on a survey, and the analysis of the goals is based on the different development documents.

  12. Hiatus in global warming - example of water temperature of the Danube River at Bogojevo gauge (Serbia

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    Ducić Vladan

    2015-01-01

    Full Text Available The research included trends in water temperature of the Danube River at Bogojevo gauge and surface air temperature at the nearby meteorological station Sombor, as well as an analysis of the results obtained in relation to the claims of the existence of the hiatus in global air temperature increase in the period 1998-2012. In the period 1961-2013, there was a statistically significant increase in the mean annual water temperature (0.039°C/year, as well as all the average monthly values. However, with annual values for the period 1998-2013, there was a decrease. The longest periods of negative trend (27 years were recorded for January and February. A high correlation was found between the surface air temperature and water temperature for all monthly and seasonal values. In the mean annual air temperature the presence of the hiatus is not observed, but a negative trend is recorded in March (32 years, December (43 years and February (49 years. The highest correlations between water temperature and North Atlantic Oscillation (NAO, Arctic Oscillation (AO and Atlantic Multidecadal Oscillation (AMO were obtained for the NAO in January (0.60, the AMO in autumn (0.52 and the NAO in winter (0.51. For surface air temperature, the highest correlations were registered for the AMO in summer (0.49 and the NAO in winter (0.42. The results indicate the dominant role of natural factors in the decrease of winter air temperature and water temperature of the Danube. [Projekat Ministarstva nauke Republike Srbije, br. III47007

  13. Microsatellites variation in sterlet sturgeon, Acipenser ruthenus from the Lower Danube

    Directory of Open Access Journals (Sweden)

    Andreea Dudu

    2013-05-01

    Full Text Available Sturgeons represent an ancient group of fish with an important scientific and commercial value. The economical significance of these species is due to their meat and roes that are considered to be a gastronomic delicacy. Unfortunately, precisely due to their economical value the sturgeons have been overexploited by fishing and poaching and nowadays are facing extinction. Currently, in the Ponto-Caspian region is found the greatest diversity of acipenserid species and the Lower Danube is the last refuge for the sturgeons from the Black Sea. Acipenser ruthenus (sterlet is a fresh water sturgeon species which has undergone a large population decline, but local populations are still surviving in most parts of the rivers draining to Black, Azov and Caspian Seas. In order to have successful conservation programs of this species is essential to evaluate its genetic diversity. Microsatellites represent valuable markers for genetic analyses aiming the assessment of genetic variability of population. In our study we analyzed the cross-amplification and the polymorphism in A. ruthenus population from the Lower Danube of seven microsatellite loci (LS-19, LS-34, LS-54, LS-57, LS-68, Aox23 and Aox45, originally isolated in North-American sturgeon species. Among the seven loci, three (LS57, Aox23 and Aox45 have showed a tetrasomic profile. The most polymorphic loci were LS-57 with 12 alleles in population, followed by Aox23 and Aox45 with 11 alleles and LS-68 with 10 alleles. Four loci (LS-19, LS-34 and LS-54 presented a lower level of polymorphism, only three alleles being identified for the analyzed individuals.

  14. Contamination of freshwater fish from rivers Sava and Danube with polychlorinated biphenyls

    International Nuclear Information System (INIS)

    Jankovic, S.; Radicevic, T.; Spiric, A.; Nedeljkovic, M.

    2002-01-01

    During air strikes, in april 1999, Institute of meat hygiene and technology have begun examination of freshwater fish to establish the degree of contamination. The information about damaged industrial facilities and toxic waste that have been spilled were hard to find, and was unofficial and contradicts. Because of that, at the first time we collected samples from different locations, but after first results, we concentrated our attention on locations on river Danube downstream from Pancevo and on river Sava upstream from Belgrade, the locations indicated as environmental 'hot spots'. According to our experience, knowledge, equipment and analytical skills we have chosen to determine the concentrations of PCBs in freshwater fish species, since aquatic fauna might be used as indicator organisms for the evaluation of water pollution. Polychlorinated biphenyls as contaminant of interest, have been chosen because large quantities of PCBs reached the soil and waste and ground waters from damaged transformers and capacitors, where they serve as dielectric fluids. Also, PCBs are highly toxic and due to their liposolubility and persistence, these compounds accumulate through food chain. In 1999, from April to December, we had collected 23 samples of different fish species on river Danube, downstream from Pancevo and 15 samples from locations on river Sava upstream from Belgrade. The concentrations of PCBs (mg/kg fat and mg/kg fresh weight) were expressed as the sum of individual congeners (IUPAC numbers 28, 52, 101, 138, 153, 180) and as Aroclor 1260 (peaks were identified as a fingerprint pattern by comparison with Aroclor standards). The concentrations of PCBs (mg/kg fat) are determined to evaluate the extent of contamination and concentrations of PCBs (mg/kg fresh weight) indicate daily intake and help us to estimate the risk for human health. Residues of PCBs in the fat extracted from fish sample were analysed according to the USDA Analytical Chemistry Guidebook. Gas

  15. The European Union strategy for the Danube – Preliminaries, mechanisms, positions, priorities and effects

    Directory of Open Access Journals (Sweden)

    Emilian M. DOBRESCU

    2011-06-01

    Full Text Available The European Union Strategy for the Danube is an internal EU strategy where all river-side countries are invited to take part, complying with the three principles applied also in the case of the EU Strategy for the Baltic Sea Region.The three pillars proposed by the European Commission and which the Strategy centers round are: connectivity (transport, energy, telecommunication, environmental protection and water management, as well as the socio-economic development (culture, education, tourism, rural development. The European Commission proposed to launch and organize a public debate in all river-side countries, conferences, seminars and round tables. The outcome of these debates will lie in the European Commission working out and bringing up, together with the river states, a paper on the theme of the EU Strategy for the Danube Region, and also a Plan of Action. This will comprise the detailed analysis of the present state and will propose a list of strategic projects. The implementation of the Plan of Action will be monitored by the European Commission and will be periodically up-dated, according to the economic conditions and the social trends in the region. Classification-JEL:N5; N7; Q4; R4Keywords:strategy, connectivity, environmental protection, water management, socio-economic development, sustainable developmentJournal:Romanian Journal of EconomicsPages:169-190Volume:32Issue:1(41Year:2011(XXIMonth: JuneFile-URL: http://www.revecon.ro/articles/2011-1/2011-1-10.pdfFile-Format: Application/pdfHandle: RePEc:ine:journl:v:1:y:2011:i:41:p:169-190

  16. Interactive Technologies of Foreign Language Teaching in Future Marine Specialists’ Training: from Experience of the Danube River Basin Universities

    Directory of Open Access Journals (Sweden)

    Olga Demchenko

    2015-08-01

    Full Text Available The article deals with the investigation of the interactive technologies of foreign language teaching in future marine specialists’ training in the Danube river basin universities. The author gives definitions of the most popular interactive technologies aimed to form communicative competence as a significant component of future mariners’ key competencies. Typology and analysis of some interactive technologies of foreign language teaching in future marine specialists’ training are provided.

  17. Exploring the diversity of Diplostomum (Digenea: Diplostomidae) in fishes from the River Danube using mitochondrial DNA barcodes

    Czech Academy of Sciences Publication Activity Database

    Kudlai, Olena; Oros, M.; Kostadinova, Aneta; Georgieva, Simona

    2017-01-01

    Roč. 10, 2 December (2017), č. článku 592. ISSN 1756-3305 R&D Projects: GA ČR GA15-14198S; GA ČR(CZ) GBP505/12/G112 Institutional support: RVO:60077344 Keywords : Diplostomum * Diplostomidae * Metacercariae * Freshwater fishes * Barcodes * cox1 * nad3 * River Danube * Europe Subject RIV: EG - Zoology OBOR OECD: Zoology Impact factor: 3.080, year: 2016

  18. Satial and seasonal variations o heavy metals in water and sediment samles collected rom the Lower Danube River

    OpenAIRE

    IONESCU Petra; RADU Violeta Monica; DEAK Gyorgy

    2016-01-01

    Surface water pollution with heavy metals represents one of the most relevant environmental issues, with severe outcomes on every other environmental compartment, affecting therefore the human health because of their toxicity, persistence and bioaccumulation tendency. The Danube, one of the most important rivers of Europe considering its course, crossing the continent from west to east, represents the main collector of all pollutants emitted by the ten countries it passes through, prior to di...

  19. Application of a radiometric enzymic method for monitoring organophosphorus and carbamate insecticide residues in water of the Danube River

    International Nuclear Information System (INIS)

    Horvath, L.; Volford, J.; Bursics, L.; Forster, T.

    1983-01-01

    Pesticide residue analyses are conventionally based on gas chromatography. These analytic procedures include tedious extraction and clear-up manipulations prior to the actual gas chromatographic determinations. Radioenzymatic method was recently applied in a residue monitoring programme on the Danube River. The programme has demonstrated that the radioenzymatic method has many advantages as a monitoring procedure in aquatic environment. Quick information can be gained without tedious sample clear-up procedure. The anticholinesteratic pesticides and the anticholinesteratic activities can be detected

  20. Tourism Potential Valorization of the River Danube in Novi Sad and its Environment Based on the Hilary Du Cros Model

    Directory of Open Access Journals (Sweden)

    Milica Pantović

    2013-01-01

    Full Text Available Natural resources are the main basis for tourism development in one region. Given that natural resources are not only aesthetic but also economic value of a certain region, they should be valorized in order to provide good basis for creating valuable tourism product. Rivers as such, are the best representatives that provide possibilities for developing different types of tourism, which could give huge benefits for the region. In this paper, the focus is on the river Danube which is the second largest river in Europe and part of Corridor VII. The aim of this paper is to evaluate and bring this river closer to the population of Serbia. Also, the intention is to show the importance of the Danube, since it flows through Novi Sad and has a great potential for developing nautical and cruising tourism. Investments in this resource would significantly contribute to the development of an integrated tourist product of Novi Sad and Serbia. Bearing all this in mind, this paper will present the results of evaluation of the Danube, based on model of Hilary Du Cros.

  1. Evaluation of melioration area damage on the river Danube caused by the hydroelectric power plant 'Djerdap 1' backwater.

    Science.gov (United States)

    Pajic, P; Andjelic, L; Urosevic, U; Polomcic, D

    2014-01-01

    Construction of the hydroelectric power plant (HPP) 'Djerdap 1' formed a backwater effect on the Danube and its tributaries, which had an inevitable influence on groundwater level, causing it to rise and thus creating additional threats to all melioration areas on more than 300 km of the Danube riversides, as well as on the riversides of its tributaries: the Sava (100 km) and the Tisa (60 km). In this paper, the HPP 'Djerdap 1' backwater effect on some characteristic melioration areas (34 in all) has been analyzed. In most of these areas intensive agricultural activity has always been present. An assessment of agricultural production damage was carried out by complex hydrodynamic calculations (60 calculation profiles) for different backwater regimes, with the aim to precisely quantify the HPP 'Djerdap 1' backwater effect on groundwater piezometric levels. Combining them with complex agroeconomic analyses, the aim is to quantify agricultural production damage and to consider the perspective of melioration area users. This method, which combines two different, but compatible, aspects of the melioration area threat assessment (hydrodynamic and agroeconomic), may present a quality base for further agricultural production threat assessment on all melioration areas on the Danube riversides, with the final aim to consider the economic effects and the importance of its further protection.

  2. Large-scale hydrological simulations using the soil water assessment tool, protocol development, and application in the danube basin.

    Science.gov (United States)

    Pagliero, Liliana; Bouraoui, Fayçal; Willems, Patrick; Diels, Jan

    2014-01-01

    The Water Framework Directive of the European Union requires member states to achieve good ecological status of all water bodies. A harmonized pan-European assessment of water resources availability and quality, as affected by various management options, is necessary for a successful implementation of European environmental legislation. In this context, we developed a methodology to predict surface water flow at the pan-European scale using available datasets. Among the hydrological models available, the Soil Water Assessment Tool was selected because its characteristics make it suitable for large-scale applications with limited data requirements. This paper presents the results for the Danube pilot basin. The Danube Basin is one of the largest European watersheds, covering approximately 803,000 km and portions of 14 countries. The modeling data used included land use and management information, a detailed soil parameters map, and high-resolution climate data. The Danube Basin was divided into 4663 subwatersheds of an average size of 179 km. A modeling protocol is proposed to cope with the problems of hydrological regionalization from gauged to ungauged watersheds and overparameterization and identifiability, which are usually present during calibration. The protocol involves a cluster analysis for the determination of hydrological regions and multiobjective calibration using a combination of manual and automated calibration. The proposed protocol was successfully implemented, with the modeled discharges capturing well the overall hydrological behavior of the basin. Copyright © by the American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America, Inc.

  3. Satial and seasonal variations o heavy metals in water and sediment samles collected rom the Lower Danube River

    Directory of Open Access Journals (Sweden)

    IONESCU Petra

    2016-12-01

    Full Text Available Surface water pollution with heavy metals represents one of the most relevant environmental issues, with severe outcomes on every other environmental compartment, affecting therefore the human health because of their toxicity, persistence and bioaccumulation tendency. The Danube, one of the most important rivers of Europe considering its course, crossing the continent from west to east, represents the main collector of all pollutants emitted by the ten countries it passes through, prior to discharging into the Black Sea. Given all this, and because of the possible unwanted effects that may occur as a result of recent constructions taking place in the area to improve the navigation conditions, the aim of this study is to evaluate the variation of the global concentration of heavy metals in both water and sediments by calculating the Metal Pollution Index (MPI on the sector between Calarasi - Braila (km 370 - km 170. Water and sediment samples from Lower Danube were collected between January 2012 and December 2013, from ten different sites. The following heavy metals have been determined: chromium (Cr, copper (Cu, zinc (Zn, lead (Pb and nickel (Ni. Metal Pollution Index values were used for a seasonal and spatial comparison of the total metal content from the established sites. For a more detailed interpretation of results, Cluster Analysis was performed. Frequent monitoring of the heavy metal content of Lower Danube has a significant impact on water quality, keeping a low pollution risk and having a long term positive impact on environmental protection of the Black Sea Basin.

  4. ORGANOCHLORINE PESTICIDES IN FISH OF THE KILIYA DELTA OF THE DANUBE (2003–2005

    Directory of Open Access Journals (Sweden)

    Yu. Sytnik

    2015-09-01

    Full Text Available Purpose. Identification and analysis of the content of organochlorine pesticides (OCP in organs and tissues of benthivorous and predatory fish species of the Kiliya delta of the Danube (Eastern mouth and their comparison with previous years. Methodology. The analysis of the samples of aquatic organisms for the content of residual organochlorine pesticides was carried out by gas-liquid chromatography (GLH based on a unified methodology. The chromatographic analysis was carried out on the gas chromatograph "Color 5" with electron capture detector at the Institute of Hydrobiology of the National Academy of Sciences of Ukraine. Findings. The effect of stable organochlorine pesticides on aquatic organisms is characterized by marked persistence in the environment and by high ability for migration and accumulation on different levels of food chains in aquatic ecosystems. The continuous presence of OCP in all investigated organs and tissues of selected species with the presence of a certain amount of fat and consequently, the fixation of residual organochlorine pesticides. Among benthivorous fishes, the content of OCP in organs and tissues (total is as follows: vimba → roach → wild carp → bream → gibel carp. Among the predators: asp → perch → European catfish → pikeperch. Originality. Recently, a significant number of scientists all around the world returns to the problem of the accumulation and distribution (redistribution of OCP in the components of aquatic ecosystems. This is associated with certain threats to the environment and human health, that could lead to negative consequences as a result of the consumption of fish as the highest trophic level in fresh waters of Ukraine. Practical value. The obtained data indicate that the major commercial fish species of the Kiliya delta of the Danube river contains residual quantities of pesticides. This indicates to the need for continuous hygienic and toxicological monitoring of fish caught

  5. Stable Isotope Signatures of Carbon and Nitrogen to Characterize Exchange Processes and Their Use for Restoration Projects along the Austrian Danube

    Energy Technology Data Exchange (ETDEWEB)

    Hein, T. [Wasser Cluster Lunz, Lunz-See and Institute of Hydrobiology and Aquatic Ecosystem Management, University for Natural Resources and Life Sciences, Vienna, (Austria); Bondar-Kunze, E. [University of Natural Resources and Applied Life Sciences, Vienna (Austria); Welti, N. [Institute of Hydrobiology and Aquatic Ecosystem Management, Vienna (Austria)

    2013-05-15

    The size and composition of an organic matter pool and its sources is a fundamental ecosystem property of river networks. River ecosystems are known to receive large amounts of terrestrial organic matter from catchments, still the question is to what extent aquatic sources influence riverine food webs or at least some components of these food webs. To identify different sources and their potential biological availability at the ecosystem level, we propose using stable isotope signatures of carbon and nitrogen and their respective elemental ratios. In this study, we used these parameters to evaluate river restoration measures. The target of the restoration was to improve surface connectivity between the main channel of the Danube downstream from Vienna and a side arm system within a floodplain. Analyses of the natural abundance of stable isotopes revealed that the restored side arm system showed distinct differences in the particulate organic matter pool in relation to hydrological connectivity. At low water levels, aquatic sources dominate in the side arm system, while at high water levels riverine organic matter is the dominating source. At medium connectivity levels aquatic sources also prevail in the side arm, thus an export of bio-available organic matter into the main channel can be expected. Based on these measurements, the increased - but hydrologically controlled - phytoplankton production was assessed and through this information, changes in ecosystem function were evaluated. (author)

  6. Foundation works for construction of Danube Bridge II Vidin (Bulgaria)-Calafat (Romania); Puente internacional sobre el rio Danubio entre las localidades de Vidin (Bulgaria) y Calafat (Rumania)

    Energy Technology Data Exchange (ETDEWEB)

    Martinez Martin, J.

    2011-07-01

    The Foundations works of the bridge over the the Danube River II has involved a new technical challenge due to the cathartics of depth and diameter of the piles, and the logistical and human, due to the hard environmental conditions for the execution. This work, awarded to FCC. Construction company in its two contracts. Access to the bridge and Main Bridge has required on the differenced sites, the use of a wide range of foundation systems, since driven precast piles to in in situ pile with permanent casing, installed by vibrating systems and excavated with benoto grabs systems. The enormous responsibility of this phase is evident in the intense camping of characterization tests with static load tests, dynamic and Osterberg cells, as well as control the campaign with Cross-hole tests in 100% of the piles in situ executed, that has allowed no only ensure the highest level of quality on the foundation elements, but also to take the most of the mechanical characteristics of soils provided. The complexity of the execution of more than 24,000 ml pile executed along the more than 2 years duration of the work reach the maximum expression in the more than 6,900 ml of in situ pile made from marine resources, with a maximum depths up to 80 m with 2 m diameter pile. The article intends to give an overview of the site and the execution, associating the different foundation methods used, and the problems that were detected. (Author)

  7. Estimating emissions of PFOS and PFOA to the Danube River catchment and evaluating them using a catchment-scale chemical transport and fate model

    International Nuclear Information System (INIS)

    Lindim, C.; Cousins, I.T.; Gils, J. van

    2015-01-01

    Novel approaches for estimating the emissions of perfluorooctane sulfonic acid (PFOS) and perfluorooctanoic acid (PFOA) to surface waters are explored. The Danube River catchment is used to investigate emissions contributing to riverine loads of PFOS and PFOA and to verify the accuracy of estimates using a catchment-scale dynamic fugacity-based chemical transport and fate model (STREAM-EU; Spatially and Temporally Resolved Exposure Assessment Model for European basins). Model accuracy evaluation performed by comparing STREAM-EU predicted concentrations and monitoring data for the Danube and its tributaries shows that the best estimates for PFOS and PFOA emissions in the Danube region are obtained by considering the combined contributions of human population, wealth (based on local gross domestic product (GDP)) and wastewater treatment. Human population alone cannot explain the levels of PFOS and PFOA found in the Danube catchment waters. Introducing wealth distribution information in the form of local GDPs improves emission estimates markedly, likely by better representing emissions resulting from consumer trends, industrial and commercial sources. For compounds such as PFOS and PFOA, whose main sink and transport media is the aquatic compartment, a major source to freshwater are wastewater treatment plants. Introducing wastewater treatment information in the emission estimations also further improves emission estimates. - Highlights: • Novel approaches for estimating PFOS/PFOA emissions to surface waters are explored. • Human population alone cannot explain the levels of PFOS/PFOA found in the Danube. • Best estimates are obtained when considering population, wealth and WWTP together.

  8. Biostratigraphy, sedimentology and paleoenvironments of the northern Danube Basin: Ratkovce 1 well case study

    Directory of Open Access Journals (Sweden)

    Rybár Samuel

    2015-02-01

    Full Text Available The Ratkovce 1 well, drilled in the Blatné depocenter of the northern Danube Basin penetrated the Miocene sedimentary record with a total thickness of 2000 m. Biostratigraphically, the NN4, NN5 and NN6 Zones of calcareous nannoplankton were documented; CPN7 and CPN8 foraminifer Zones (N9, 10, 11 of the global foraminiferal zonation; and MMi4a; MMi5 and MMi6 of the Mediterranean foraminiferal zonation were recognized. Sedimentology was based on description of well core material, and together with SP and RT logs, used to characterize paleoenvironmental conditions of the deposition. Five sedimentary facies were reconstructed: (1 fan-delta to onshore environment which developed during the Lower Badenian; (2 followed by the Lower Badenian proximal slope gravity currents sediments; (3 distal slope turbidites were deposited in the Lower and Upper Badenian; (4 at the very end of the Upper Badenian and during the Sarmatian a coastal plain of normal marine to brackish environment developed; (5 sedimentation finished with the Pannonian-Pliocene shallow lacustrine to alluvial plain deposits. The provenance analysis records that the sediment of the well-cores was derived from crystalline basement granitoides and gneisses and from the Permian to Lower Cretaceous sedimentary cover and nappe units of the Western Carpathians and the Eastern Alps. Moreover, the Lower Badenian volcanism was an important source of sediments in the lower part of the sequence.

  9. The Role of Media in Social Integration within the Danube Region

    Directory of Open Access Journals (Sweden)

    Yoanna Pankova

    2014-08-01

    Full Text Available This work analyses the importance of media as a perpetrator, influencing the pace of social integration. The article explores the differentiation in the way various media present events and the power of its influence. Prior Work: Study of Social integration, Approach: Survey among various media and its impact, Results: The results of the research show that the role of media is crucial for the subsequent attitude of citizens of the Danube region. It depends on the minimized or exaggerated impact of various issues, presented by it. The news media, as a global informative actor in shaping citizen`s acquaintance on various topics, is crucial player in the process of integration. Implications: The significance of media`s influence is effecting not only the attitude of citizens but also the tourism development. Value: With the emergence of printing and broadcasting media, their impact on the fulfilment of social unity is constantly emerging. Due to that fact it is necessary to explore the various types of media and their influence.

  10. Using residual tritiated water from Cernavoda NPP to study Danube - Black Sea Canal hydrodynamics

    International Nuclear Information System (INIS)

    Varlam, C.; Stefanescu, I.; Lazar, R.; Varlam, M.; Patrascu, V.; Bucur, C.; Bobric, E.

    2003-01-01

    By benefiting of Cernavoda NPP's location in the neighbourhood of Danube - Black Sea Canal one suggests extending the area of interest along this canal particularly to use the residual tritiated water from this CANDU type reactor as tracing means in the study of canal's hydrodynamics. This canal appears to be ideal for such a study because releases in normal operation of NPP are occasional. The tritiated water can be used for simulating the transport and dispersion of soluble pollutants because it has the same physical characteristics as the usual water. By measuring response curves produced at injecting a known amount of tracer one can developed an efficient method for estimating: the soluble pollutant velocity along the canal; attenuation rate of concentration peak as a function of time as well as the time required by the propagation front of the soluble pollutant to reach a given point along the canal. In this work the calculation of the mixture length as a function of the particular characteristics of the canal is presented as well as different experimental formulas. Also the reference level of tritium concentration in the investigated area is established for future experiments

  11. Analysis and modelling of spatio-temporal properties of daily rainfall over the Danube basin

    Science.gov (United States)

    Serinaldi, F.; Kilsby, C. G.

    2012-04-01

    Central and Eastern Europe are prone to severe floods due to heavy rainfall that cause societal and economic damages, ranging from agriculture to water resources, from the insurance/reinsurance sector to the energy industry. To improve the flood risk analysis, a better characterisation and modelling of the rainfall patterns over this area, which involves the Danube river watershed, is strategically important. In this study, we analyse the spatio-temporal properties of a large data set of daily rainfall time series from 15 countries in the Central Eastern Europe through different lagged and non-lagged indices of associations that quantify both the overall dependence and extreme dependence of pairwise observations. We also show that these measures are linked to each other and can be written in a unique and coherent notation within the copula framework. Moreover, the lagged version of these measures allows exploring some important spatio-temporal properties of the rainfall fields. The exploratory analysis is complemented by the preliminary results of a spatio-temporal rainfall simulation performed via a compound model based upon the Generalized Additive Models for Location, Scale and Shape (GAMLSS) and meta-elliptical multivariate distributions.

  12. The design of a DataBase for Natural Resources in Danube Delta Biosphere Reserve DDBR

    Directory of Open Access Journals (Sweden)

    GRIGORAS Ion

    2016-12-01

    Full Text Available Efficient use of natural resources especially in Natura 2000 sites is an essential component of Europe 2020 strategy. The use of web database is absolutely necessary for a good resource management and it will provide a good communication channel for the main stakeholders: protected area manager, scientists, resources evaluators and local community. Access to information from database is allowed according with the user competence. General information on natural resources uses in Danube Delta Biosphere Reserve (D.D.B.R. will be freely available. Different degree of information, especially regarding editing data will be applied for the main actors involved in use of natural resources. Evaluators that are mainly scientists with good biodiversity background, protected area staff that applies the regulation regarding natural resources in relation with ecological conditions, private companies or persons interested in harvesting natural resources. The user interface is realized by using OpenSource products. The web interface for tabular data was build using ExtJs Javascrip library. The web map user interface was build using Openlayers, GeoExt, and Ext. For database SQL server we chose PostgresSQL and GeoServer for maps server

  13. Measures to be undertaken in order to preserve the trophic state of the ''New Danube'' at Vienna in the case of the construction of the Vienna-Freudenau hydropower plant

    Energy Technology Data Exchange (ETDEWEB)

    Fleckseder, H [Inst. fuer Wasserguete und Landschaftswasserbau, Vienna (AT)

    1990-01-01

    The ''Neue Donau'' (''New Danube'') at Vienna was erected for flood protection reasons, but turned out to be a water resort area close to the City Center (bathing, swimming, surfing along 40 km of beaches). At Vienna, a hydropower plant on River Danube (Vienna-Freudenau) is under discussion. This paper discusses various alternatives in order to keep the trophic state of New Danube as is at present, but takes also into account left bank water resources questions as well as the hygienic situation (bathing, swimming, surfing). A comparison of all alternatives indicates that, as eutrophication of New Danube is phosphorus driven, precipitation of P in wastewater treatment in the upstream drainage area is the best solution in respect to the situation of New Danube, the overall drainage basin and the receiving Black Sea. (author).

  14. Typology of historical sources and the reconstruction of long-term historical changes of riverine fish: a case study of the Austrian Danube and northern Russian rivers

    Science.gov (United States)

    Haidvogl, Gertrud; Lajus, Dmitry; Pont, Didier; Schmid, Martin; Jungwirth, Mathias; Lajus, Julia

    2014-01-01

    Historical data are widely used in river ecology to define reference conditions or to investigate the evolution of aquatic systems. Most studies rely on printed documents from the 19th century, thus missing pre-industrial states and human impacts. This article discusses historical sources that can be used to reconstruct the development of riverine fish communities from the Late Middle Ages until the mid-20th century. Based on the studies of the Austrian Danube and northern Russian rivers, we propose a classification scheme of printed and archival sources and describe their fish ecological contents. Five types of sources were identified using the origin of sources as the first criterion: (i) early scientific surveys, (ii) fishery sources, (iii) fish trading sources, (iv) fish consumption sources and (v) cultural representations of fish. Except for early scientific surveys, all these sources were produced within economic and administrative contexts. They did not aim to report about historical fish communities, but do contain information about commercial fish and their exploitation. All historical data need further analysis for a fish ecological interpretation. Three case studies from the investigated Austrian and Russian rivers demonstrate the use of different source types and underline the necessity for a combination of different sources and a methodology combining different disciplinary approaches. Using a large variety of historical sources to reconstruct the development of past fish ecological conditions can support future river management by going beyond the usual approach of static historical reference conditions. PMID:25284959

  15. Body burden of pesticides and wastewater-derived pollutants on freshwater invertebrates: Method development and application in the Danube River.

    Science.gov (United States)

    Inostroza, Pedro A; Wicht, Anna-Jorina; Huber, Thomas; Nagy, Claudia; Brack, Werner; Krauss, Martin

    2016-07-01

    While environmental risk assessment is typically based on toxicant concentrations in water and/or sediment, awareness is increasing that internal concentrations or body burdens are the key to understand adverse effects in organisms. In order to link environmental micropollutants as causes of observed effects, there is an increasing demand for methods to analyse these chemicals in organisms. Here, a multi-target screening method based on pulverised liquid extraction (PuLE) and a modified QuEChERS approach with an additional hexane phase was developed. It is capable to extract and quantify organic micropollutants of diverse chemical classes in freshwater invertebrates. The method was tested on gammarids from the Danube River (within the Joint Danube Survey 3) and target compounds were analysed by liquid chromatography-tandem mass spectrometry (LC-MS/MS). Furthermore, a non-target screening using high resolution-tandem mass spectrometry (LC-HRMS/MS) was conducted. A total of 17 pollutants were detected and/or quantified in gammarids at low concentrations. Pesticide concentrations ranged from 0.1 to 6.52 ng g(-1) (wet weight), those of wastewater-derived pollutants from 0.1 to 2.83 ng g(-1) (wet weight). The presence of wastewater-derived pollutants was prominent at all spots sampled. Using non-target screening, we could successfully identify several chlorinated compounds. These results demonstrate for the first time the presence of pesticides and wastewater-derived pollutants in invertebrates of the Danube River. Copyright © 2016 Elsevier Ltd. All rights reserved.

  16. Synergy between Sentinel-1 radar time series and Sentinel-2 optical for the mapping of restored areas in Danube delta

    Science.gov (United States)

    Niculescu, Simona; Lardeux, Cédric; Hanganu, Jenica

    2018-05-01

    Wetlands are important and valuable ecosystems, yet, since 1900, more than 50 % of wetlands have been lost worldwide. An example of altered and partially restored coastal wetlands is the Danube Delta in Romania. Over time, human intervention has manifested itself in more than a quarter of the entire Danube surface. This intervention was brutal and has rendered ecosystem restoration very difficult. Studies for the rehabilitation / re-vegetation were started immediately after the Danube Delta was declared as a Biosphere Reservation in 1990. Remote sensing offers accurate methods for detecting and mapping change in restored wetlands. Vegetation change detection is a powerful indicator of restoration success. The restoration projects use vegetative cover as an important indicator of restoration success. To follow the evolution of the vegetation cover of the restored areas, satellite images radar and optical of last generation have been used, such as Sentinel-1 and Sentinel-2. Indeed the sensor sensitivity to the landscape depends on the wavelength what- ever radar or optical data and their polarization for radar data. Combining this kind of data is particularly relevant for the classification of wetland vegetation, which are associated with the density and size of the vegetation. In addition, the high temporal acquisition frequency of Sentinel-1 which are not sensitive to cloud cover al- low to use temporal signature of the different land cover. Thus we analyse the polarimetric and temporal signature of Sentinel-1 data in order to better understand the signature of the different study classes. In a second phase, we performed classifications based on the Random Forest supervised classification algorithm involving the entire Sentinel-1 time series, then starting from a Sentinel-2 collection and finally involving combinations of Sentinel-1 and -2 data.

  17. Interannual variability of Danube waters propagation in summer period of 1992-2015 and its influence on the Black Sea ecosystem

    Science.gov (United States)

    Kubryakov, A. A.; Stanichny, S. V.; Zatsepin, A. G.

    2018-03-01

    The propagation of the Danube River plume has strong interannual variability that impacts the local balance of nutrients and the thermohaline structure in the western Black Sea. In the present study, we use a particle-tracking model based on satellite altimetry measurements and wind reanalysis data, as well as satellite measurements (SeaWiFS, MODIS), to investigate the interannual variability in the Danube plume pathways during the summer from 1993 to 2015. The wind conditions largely define the variability in the Danube water propagation. Relatively low-frequency variability (on periods of a week to months) in the wind stress curl modulates the intensity of the geostrophic Rim Current and related mesoscale eddy dynamics. High-frequency offshore wind-drift currents transport the plume across isobaths and provide an important transport link between shelf and offshore circulation. Inherent plume dynamics play an additional role in the near-mouth transport of the plume and its connection with offshore circulation. During the years with prevailing northeast winds ( 30% of studied cases), which are usually accompanied by increased wind curl over the Black Sea and higher Danube discharge, an alongshore southward current at the NorthWestern Shelf (NWS) is formed near the western Black Sea coast. Advected southward, the Danube waters are entrained in the Rim Current jet, which transports them along the west coast of the basin. The strong Rim Current, fewer eddies and downwelling winds substantially decrease the cross-shelf exchange of nutrients. During the years with prevailing southeastern winds ( 40%), the Rim Current is less intense. Mesoscale eddies effectively trap the Danube waters, transporting them to the deep western part of the basin. The low- and high-frequency southeastern wind-drift currents contribute significantly to cross-isobath plume transport and its connection with offshore circulation. During several years ( 15%), the Danube waters moved eastward to

  18. Peasant Self-Government in the Ukrainian Danube Region (End of XIX - Early XX Century.: Social and Cultural Aspects

    Directory of Open Access Journals (Sweden)

    Irina Verkhovtseva

    2013-08-01

    Full Text Available The complex historical destiny of Ukrainian Danube region in the nineteenth century led to the fact that by the end of this century, in the counties of the region peasant self-government was organized in different ways: in Akkerman - according to the reform in 1868, carried out by the Russian authorities in Bessarabia, and in Ismail - in accordance with the reforms of 1864-1874 years conducted by the Romanian government. The author compares and analyzes the peasant self-government in the counties of the province in the context of its sociocultural development in the unfolding process of modernization of the late XIX - early XX centuries.

  19. Body burden of pesticides and wastewater-derived pollutants on freshwater invertebrates: Method development and application in the Danube River

    International Nuclear Information System (INIS)

    Inostroza, Pedro A.; Wicht, Anna-Jorina; Huber, Thomas; Nagy, Claudia; Brack, Werner; Krauss, Martin

    2016-01-01

    While environmental risk assessment is typically based on toxicant concentrations in water and/or sediment, awareness is increasing that internal concentrations or body burdens are the key to understand adverse effects in organisms. In order to link environmental micropollutants as causes of observed effects, there is an increasing demand for methods to analyse these chemicals in organisms. Here, a multi-target screening method based on pulverised liquid extraction (PuLE) and a modified QuEChERS approach with an additional hexane phase was developed. It is capable to extract and quantify organic micropollutants of diverse chemical classes in freshwater invertebrates. The method was tested on gammarids from the Danube River (within the Joint Danube Survey 3) and target compounds were analysed by liquid chromatography-tandem mass spectrometry (LC-MS/MS). Furthermore, a non-target screening using high resolution-tandem mass spectrometry (LC-HRMS/MS) was conducted. A total of 17 pollutants were detected and/or quantified in gammarids at low concentrations. Pesticide concentrations ranged from 0.1 to 6.52 ng g −1 (wet weight), those of wastewater-derived pollutants from 0.1 to 2.83 ng g −1 (wet weight). The presence of wastewater-derived pollutants was prominent at all spots sampled. Using non-target screening, we could successfully identify several chlorinated compounds. These results demonstrate for the first time the presence of pesticides and wastewater-derived pollutants in invertebrates of the Danube River. - Highlights: • A method based on pulverised liquid extraction/QuEChERS for organic micropollutants in invertebrates was developed. • The method is applicable in assessing target environmental pollutants in invertebrates by LC-MS/MS. • The method allows for a nontarget screening of extracts by LC-HRMS. • First body burden analysis of pesticides and wastewater-derived pollutants in invertebrates in the Danube River is reported. - Capsule: A multi

  20. Extending the area of investigation of fine versus coarse quartz optical ages from the Lower Danube to the Carpathian Basin

    DEFF Research Database (Denmark)

    Timar-Gabor, Alida; Constantin, Daniela; Marković, S.B.

    2015-01-01

    mm) grains and coarse (63e90 mm) grains respectively. The current study aims at expanding these investigations, both by extending the area of study from the Lower Danube Basin to the Carpathian Basin and by applying time-resolved optically stimulated luminescence (TR-OSL) on quartz, in order to gain...... is observed for both continuous wave (CW-OSL) and pulsed OSL (POSL), where the dose response (up to 1000 Gy) is well described by a sum of two saturating exponential functions. TR-OSL measurements show one single, characteristic quartz lifetime for both natural as well as regenerative signals in the entire...

  1. Educating for action: Aligning skills with policies for sustainable development in the Danube river basin.

    Science.gov (United States)

    Irvine, Kenneth; Weigelhofer, Gabriele; Popescu, Ioana; Pfeiffer, Ellen; Păun, Andrei; Drobot, Radu; Gettel, Gretchen; Staska, Bernadette; Stanica, Adrian; Hein, Thomas; Habersack, Helmut

    2016-02-01

    Sustainable river basin management depends on knowledge, skills and education. The DANCERS project set out to identify feasible options for achieving education for sustainable water management across the Danube river basin, and its integration with broader education and economic development. The study traced the historic, regulatory and educational landscape of water management in the basin, contrasting it with the complex political decision-making, data-heavy decision support, learning-centred collaboration, and information-based participation that are all inherent components of Integrated Water Resource Management (IWRM). While there is a wide range of educational opportunities and mobility schemes available to individuals, there is no coherent network related to training in water management and sustainable development in the study region. Progress in addressing the multi-layered environmental challenges within the basin requires further aligning of economic, environmental and educational policies, advancing the EU Bologna Process across the region, and the development of dedicated training programmes that combine technical and relational skills. The DANCERS project identified key short and medium term needs for education and research to support progressive adoption of sustainable development, and the necessary dialogue across the public and private sectors to align policies. These include the development of new education networks for masters and PhD programmes, including joint programmes; improved access to technical training and life-long learning programmes for skills development; developing formalized and certified competency structures and associated accreditation of institutions where such skilled individuals work; and developing a co-ordinated research infrastructure and pan-basin programme for research for water management and sustainable development. Copyright © 2015 Elsevier B.V. All rights reserved.

  2. Study of pike-perch (Sander lucioperca fishery from Razim Lake, Danube delta Romania

    Directory of Open Access Journals (Sweden)

    CERNIȘENCU Irina

    2018-05-01

    Full Text Available The Razim Lake is a great part of the Danube Delta Biosphere Reserve (DDBR, with a surface of 54,000 ha. Fish fauna from Razim lake include pike-perch (Sander lucioperca as one of the main top predators of fish community, however ecological significance indicates accessory species, recedent as dominance, sometimes been subrecedent species like in 2011 and 2012 sampling, but constant species regarding frequency in sampling. Otherwise, pike-perch is an important value DDBR fishery species with an average of 5% in total catch, range 2-10%, from what Razim lake contributes with average 71%, range 41-95% in the 1960-2015 period. Razim Lake has been in average 13%, range 1-40% from total Razim lake catch, in the same period of time. Since in RBDD has been fishing up to 2000 fisherman, in Razim lake activated up to 500 fishermen, however nowadays number of fishermen was regulated at lower range. Catch data series shows a continuous stock decline trend, considered to be a consequences of habitat degradation and over-exploitation. Fish stock estimation in last 15 years (2001-2016 support the hypothesis of over-exploitation. Based on length frequency structure of landings, the growth and exploitation parameters have been estimated as well as the average biomass and the maximum sustainable yields for the Razim lake pike-perch stock. Recommendation concerning fisheries management towards sustainable fishing of pike-perch stock, as increasing of cod-end seine mesh size and decreasing of fishing effort regulation are outlined.

  3. Heavy metal bio-accumulation in tissues of sturgeon species of the Lower Danube River, Romania

    Directory of Open Access Journals (Sweden)

    ONĂRĂ Dalia Florentina

    2013-12-01

    Full Text Available This study investigates bio-accumulation of heavy metals in tissues of sturgeons of the North-Western Black Sea and Lower Danube River (LDR. Samples (10 – 30 gr of liver, muscle, fat, gonads and skin tissues collected in October 2003 from 21 adult specimens of three sturgeon species: Acipenser stellatus (10, A. gueldenstaedtii (2, and Huso huso (9 were analysed for content in Cd, Cu, Zn, Pb, Mn, Fe and Ni, using VARIAN Spectra A100. The highest concentrations of Zn, Cu and Cd were found in liver and the smallest in muscles of sturgeons. The highest heavy metal content was detected in tissues of stellate sturgeons, followed by Russian sturgeons. In all three species Cd and Cu content of the liver as well as of the stellate sturgeon muscle surpassed the admitted limits for human consumption (Cd – 0.05; Zn - 50; Cu – 5.0; Pb – 0.3 [mg / kg wet weight]. In view of a future re-opening of the commercial fishing of wild sturgeons it is strongly recommended testing the heavy metal level prior delivering sturgeon products to the market. Avoiding human consumption of liver of sturgeons captured in the LDR is strongly recommended as well. In the case of Cd a bio-accumulation with age of sturgeons was visible. In all species males seem to accumulate more heavy metals in their tissues. We explain this as effect of more frequent spawning migration of males in the LDR, the major contamination source. Beluga sturgeons show less heavy metal bio-accumulation of tissues.

  4. Mobile dynamic passive sampling of trace organic compounds: Evaluation of sampler performance in the Danube River.

    Science.gov (United States)

    Vrana, Branislav; Smedes, Foppe; Allan, Ian; Rusina, Tatsiana; Okonski, Krzysztof; Hilscherová, Klára; Novák, Jiří; Tarábek, Peter; Slobodník, Jaroslav

    2018-03-29

    A "dynamic" passive sampling (DPS) device, consisting of an electrically driven large volume water pumping device coupled to a passive sampler exposure cell, was designed to enhance the sampling rate of trace organic compounds. The purpose of enhancing the sampling rate was to achieve sufficient method sensitivity, when the period available for sampling is limited to a few days. Because the uptake principle in the DPS remains the same as for conventionally-deployed passive samplers, free dissolved concentrations can be derived from the compound uptake using available passive sampler calibration parameters. This was confirmed by good agreement between aqueous concentrations of polycyclic aromatic hydrocarbons (PAHs), polychlorinated biphenyls (PCBs) and hexachlorobenzene (HCB) derived from DPS and conventional caged passive sampler. The DPS device enhanced sampling rates of compounds that are accumulated in samplers under water boundary layer control (WBL) more than five times compared with the conventionally deployed samplers. The DPS device was deployed from a ship cruising downstream the Danube River to provide temporally and spatially integrated concentrations. A DPS-deployed sampler with surface area of 400cm 2 can reach sampling rates up to 83Ld -1 . The comparison of three passive samplers made of different sorbents and co-deployed in the DPS device, namely silicone rubber (SR), low density polyethylene (LDPE) and SDB-RPS Empore™ disks showed a good correlation of surface specific uptake for compounds that were sampled integratively during the entire exposure period. This provided a good basis for a cross-calibration between the samplers. The good correlation of free dissolved PAHs, PCBs and HCB concentration estimates obtained using SR and LDPE confirmed that both samplers are suitable for the identification of concentration gradients and trends in the water column. We showed that the differences in calculated aqueous concentrations between sampler types

  5. The main tasks and obtained results within soil protection working group of the Danube countries

    International Nuclear Information System (INIS)

    Dzatko, M.

    1997-01-01

    In the frame of the Danube Countries Working Community activities was in 1993 constituted independent Soil Protection Working Group (SPWG). Its primary task is to elaborate principles and common soil protection concept in given countries accepted on the level of governments and related authorities, and also to the solution of the solution of the problems on regional levels. Final objective is to implement such concept of soil protection policy, which is able to maintain its quality and productivity potential for next generations also. Based on four years activities coordination could be significance and the SPWG relevance expressed in following topics: (1) Soil pollution and soil degradation, particularly in most pos-communistic countries has been attaining high degree, and in many locations also the threshold of ecological be arability. As reclamation and revitalization of the degraded and polluted soils require long time and considerable financial means, it is not only moral;, even also economically more effective to protect preventively than subsequent reclamation. (2) Main objective of the correct soil protection policy should be its high quality conservation also for the next generations. To this is joined also the protection not only productional, but also non-productional functions, particularly filtrational, transformational and buffering capacibility, including its role and significance, as land and environment. From, in this way considered relationships reality is resulting that the soil protection objectives are not only laws and prohibition approvement, but also active relationships harmonization between the man requirements and soil productivity potential, in order of the sustainable land resources use for the next generations. (3) Based on mentioned realities and relationships we consider the SPWG as an active gremium for elaboration of the the uniform soil protection concepts for governments and responsible organisations that in financial consequence

  6. Planning, architecture, seismic, construction and energy-related criteria for sustainable spatial development in the Danube Delta Biosphere Reserve area

    Directory of Open Access Journals (Sweden)

    Vasile Meiţă

    2014-09-01

    Full Text Available The Danube Delta Biosphere Reserve represents a complex of ecosystems embedding a biome that had been included on UNESCO World Heritage list due to its global environmental importance. The outstanding natural diversity, including ecosystems, habitats and species situated at the top of European and International conservation lists, is mixed with an equally rich and important cultural (ethnic and religious diversity of the human communities inhabiting the area. According to the guidelines of the Man and the Biosphere Programme of UNESCO, the biosphere reserves including human settlements should be managed such that they could constitute an example for what sustainable development means. Starting from the spatial dimension added to the traditional socioeconomic, ecological and cultural pillars of sustainable development, the paper examines planning, architecture, seismic, construction and energy-related criteria that could substantiate a sustainable development model applicable to the Danube Delta, and counter the effects of clime change in the area. The results suggest that the traditional practices of the inhabitants could offer sustainable solutions and help preserving the natural and cultural diversity of the region.

  7. MIGRATION OF HOMININS WITH MEGAHERBIVORES INTO EUROPE VIA THE DANUBE-PO GATEWAY IN THE LATE MATUYAMA CLIMATE REVOLUTION

    Directory of Open Access Journals (Sweden)

    GIOVANNI MUTTONI

    2014-11-01

    Full Text Available We update critical reviews of sites bearing hominin remains and/or tools from Europe (including the Balkans and Greece and conclude that the only compelling evidence of hominin presence in these regions was after ~0.9 Ma (million-years-ago, bracketed by the end of the Jaramillo subchron (0.99 Ma and the Brunhes-Matuyama boundary (0.78 Ma and straddling the climatic late Early Pleistocene revolution (EPR at the onset of enhanced glacial/interglacial activity that reverberated worldwide. Europe may have become initially populated during the EPR when, possibly for the first time in the Pleistocene, vast and exploitable ecosystems were generated along the Danube-Po Gateway. These newly formed settings, characterized by lowlands with open grasslands and reduced woody cover during glacial/interglacial transitions, represented the closest analogues to the savanna environment to which several large mammals linked with hominins in a common food web were adapted. It was only after stable and vast grassland-savanna environments opened that large mammals (e.g. megaherbivores could expand into Europe along the Danube-Po Gateway in conjunction with the attached food web to which hominins belonged.

  8. The Annals of Braila - The Most Important Regional Culture Journal in the Interwar Period of the Lower Danube

    Directory of Open Access Journals (Sweden)

    Cristina Dosuleanu

    2011-12-01

    Full Text Available “The Annals of Braila” is one of the most important regional cultural journals published in the interwar period, due to the cultural phenomenon of regionalism. This was the response of Romanian intellectuals to the exaggerated influence of the West in all areas, that is the emergence of what Titu Maiorescu called forms without substance. As a result, immediately after the Great Union of 1918, young people, mostly students, who already exposed their ideas in scientific societies, began to organize information-gathering activities in all domains in certain areas and then they published them as scientific texts. That is how regional culture journals appeared in Craiova, Brasov, Timisoara and Constanta. Curiously, all have been mentioned in history books of press or in dictionaries except “The Annals of Braila”. A careful examination shows that the journal was probably not only a refuge, as the Braila journal was as important as the other. And in order to support this we should mention: it appeared for 12 years despite the financial difficulties, while others were released for a smaller period of time, it had as collaborators important people of the Romanian culture and literature, and its studies concerned the entire area of the Lower Danube, the analyzes, documents, information having considered other cities that are on the Danube shores. Therefore, we believe that the “Annals of Braila” journal must stand alongside the other regional culture journals and enjoy the same importance.

  9. Artificial and natural radionuclides in the river Danube - essentials of a three year investigation (1993-1996)

    International Nuclear Information System (INIS)

    Maringer, F.J.; Ramer, A.; Rezniczek, O.

    1998-01-01

    The median activity concentrations in the Danube water (free of suspended matter) was about 1.2, 75, and 2.0 mBq/l for Cs-137, K-40 and Ra-226, respectively. In the sediment and suspended matter, the values for K-40 and Ra-226 are about 600 and 50 Bq/kg dry weight, respectively. The average Cs-137 activity concentration in sediments decreased from 100 Bq/kg in June 1993 to 70 Bq/kg in June 1996. The concentration in suspended matter was about 1.67 higher than in bottom sediments. Suspended matter and sediments were also examined with respect to the transport of Pb-210 and Cs-137, as well as of K-40 and U-238. The annual radioactivity load of the Austrian segment of the Danube (dissolved in water and bound to suspended matter), as calculated based on the activity concentrations and daily suspended matter flow rate, was about 6, 0.3, and 0.5 TBq for K-40, Ra-226, and Cs-137, respectively. (P.A.)

  10. Considerations regarding the occurence of the Eurasian Beaver (Castor fiber Linnaeus 1758 in the Danube Delta (Romania

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    ALEXE Vasile

    2012-09-01

    Full Text Available On its original Romanian name - breb, the Eurasian Beaver (Castor fiber extinct at us for almost two centuries and reintroduced in some areas of the country, at present is better known under the name of his North American relative, beaver. In the last decades, this specie has been reintroduced within in its old habitats from where itwas extinct, especially under the effect of human pressure. Since 1998, reinsertion actions took place in Romania, in many areas, the closest one to Danube Delta area being the lower part of Ialomita river. By 2011 epigraphic or paleozoology evidences about the presence of this mammalian into the actual Delta have not been found, except the Lower Danube, up to Isaccea, but also near Dobrogea Plateau in Murighiol area. Its last Paleontology evidences come from early medieval period. Until now, the actual delta was considered a territory inappropriate for the Eurasian Beaver, due to high fluctuations of the water levels. But, in April 2011, the spontaneous appearance of the European beaver near Maliuc area was proved, a copy killed by poachers. In July 2011, a Beaver injured after the collision with a boat was found and scientifically investigated. The future observations will have to document if this mammal extends its habitat up here or remains an erratic appearance. In case of success of spontaneous colonization, its consequences and effects on the environment in general and on biodiversity inparticular are required to be monitored.

  11. Scardinius knezevici Bianco & Kottelat, 2005 and Alburnus scoranza Bonaparte, 1845: New species of ichthyofauna of Serbia and the Danube basin

    Directory of Open Access Journals (Sweden)

    Simić V.

    2012-01-01

    Full Text Available Research into the ichthyofauna of the Vlasina Lake reservoir in south Serbia, which is part of the Danube basin, was carried out in 1993, 40 years after its formation. The results of the research reveal the presence of several species of fish belonging to the Adriatic and Aegean basin, such as Alburnus albidus, Rutilus basak, Scardinius graecus and Pachychilon macedonicus. These findings are of great importance from the aspect of conservation, because the species Scardinius graecus and Alburnus albidus are on the European list of endangered fish species. In the latest study of the Vlasina Lake reservoir ichthyofauna (70 years after its formation, the above-mentioned species were not found. However, the presence of naturalized populations of two species from the Adriatic basin were confirmed: Scardinius knezevici and Alburnus scoranza. These findings represent the first known areal expansion of these species, which are new to the ichthyofauna of Serbia, from the Adriatic into the Danube (Black Sea basin.[Acknowledgments. The present work was supported by the Ministry of Education and Science of the Republic of Serbia (Projects No. 43002 and 173025.

  12. The Danube so colourful: a potpourri of plastic litter outnumbers fish larvae in Europe's second largest river.

    Science.gov (United States)

    Lechner, Aaron; Keckeis, Hubert; Lumesberger-Loisl, Franz; Zens, Bernhard; Krusch, Reinhard; Tritthart, Michael; Glas, Martin; Schludermann, Elisabeth

    2014-05-01

    Previous studies on plastic pollution of aquatic ecosystems focused on the world's oceans. Large rivers as major pathways for land-based plastic litter, has received less attention so far. Here we report on plastic quantities in the Austrian Danube. A two year survey (2010, 2012) using stationary driftnets detected mean plastic abundance (n = 17,349; mean ± S.D: 316.8 ± 4664.6 items per 1000 m(-3)) and mass (4.8 ± 24.2 g per 1000 m(-3)) in the river to be higher than those of drifting larval fish (n = 24,049; 275.3 ± 745.0 individuals. 1000 m(-3) and 3.2 ± 8.6 g 1000 m(-3)). Industrial raw material (pellets, flakes and spherules) accounted for substantial parts (79.4%) of the plastic debris. The plastic input via the Danube into the Black Sea was estimated to 4.2 t per day. Copyright © 2014 The Authors. Published by Elsevier Ltd.. All rights reserved.

  13. The distribution and abundance of the Neogobius fishes in their native range (Bulgaria) with notes on the non-native range in the Danube River

    Czech Academy of Sciences Publication Activity Database

    Polačik, Matej; Janáč, Michal; Trichkova, T.; Vassilev, M.; Keckeis, H.; Jurajda, Pavel

    2008-01-01

    Roč. 18, 1-2 (2008), s. 193-208 ISSN 0945-3784 R&D Projects: GA MŠk LC522 Institutional research plan: CEZ:AV0Z60930519 Keywords : Neogobius fishes * Danube River Subject RIV: EH - Ecology, Behaviour

  14. Piroplasms in feral and domestic equines in rural areas of the Danube Delta, Romania, with survey of dogs as a possible reservoir

    Czech Academy of Sciences Publication Activity Database

    Gallusová, M.; Qablan, M.; D'Amico, G.; Oborník, Miroslav; Petrželková, Klára Judita; Mihalca, A. D.; Modrý, David

    2014-01-01

    Roč. 206, 3-4 (2014), s. 287-292 ISSN 0304-4017 Institutional support: RVO:60077344 Keywords : T. equi * Babesia cablli * Equine piroplasmoses * Danube Delta * Genetic diversity Subject RIV: GJ - Animal Vermins ; Diseases, Veterinary Medicine Impact factor: 2.460, year: 2014

  15. Piroplasms in feral and domestic equines in rural areas of the Danube Delta, Romania, with survey of dogs as a possible reservoir

    Czech Academy of Sciences Publication Activity Database

    Gallusová, M.; Qablan, M. A.; D'Amico, G.; Oborník, M.; Petrželková, Klára Judita; Mihalca, A. D.; Modrý, D.

    2014-01-01

    Roč. 206, 3-4 (2014), s. 287-292 ISSN 0304-4017 Institutional support: RVO:68081766 Keywords : T. equi * Babesia caballi * Equine piroplasmoses * Danube Delta * Genetic diversity Subject RIV: GJ - Animal Vermins ; Diseases, Veterinary Medicine Impact factor: 2.460, year: 2014

  16. The response of benthic macroinvertebrate and fish assemblages to human impact along the lower stretch of the rivers Morava and Dyje (Danube basin, Czech Republic)

    Czech Academy of Sciences Publication Activity Database

    Adámek, Zdeněk; Zahrádková, S.; Jurajda, Pavel; Bernardová, I.; Jurajdová, Zdenka; Janáč, Michal; Němejcová, D.

    2013-01-01

    Roč. 71, č. 3 (2013), s. 93-115 ISSN 1330-061X R&D Projects: GA ČR GBP505/12/G112 Institutional support: RVO:68081766 Keywords : Macrozoobenthos * Fish * Diversity * River pollution * River regulation * Joint Danube Survey Subject RIV: EG - Zoology http://ribarstvo.agr.hr/volumes.php?lang=en&search=Article%3A656

  17. Abundance and biomass responses of microbial food web components to hydrology and environmental gradients within a floodplain of the River Danube.

    Science.gov (United States)

    Palijan, Goran

    2012-07-01

    This study investigated the relationships of time-dependent hydrological variability and selected microbial food web components. Samples were collected monthly from the Kopački Rit floodplain in Croatia, over a period of 19 months, for analysis of bacterioplankton abundance, cell size and biomass; abundance of heterotrophic nanoflagellates and nanophytoplankton; and concentration of chlorophyll a. Similar hydrological variability at different times of the year enabled partition of seasonal effects from hydrological changes on microbial community properties. The results suggested that, unlike some other studies investigating sites with different connectivity, bacterioplankton abundance, and phytoplankton abundance and biomass increased during lentic conditions. At increasing water level, nanophytoplankton showed lower sensitivity to disturbance in comparison with total phytoplankton biomass: this could prolong autotrophic conditions within the floodplain. Bacterioplankton biomass, unlike phytoplankton, was not impacted by hydrology. The bacterial biomass less affected by hydrological changes can be an important additional food component for the floodplain food web. The results also suggested a mechanism controlling bacterial cell size independent of hydrology, as bacterial cell size was significantly decreased as nanoflagellate abundance increased. Hydrology, regardless of seasonal sucession, has the potential to structure microbial food webs, supporting microbial development during lentic conditions. Conversely, other components appear unaffected by hydrology or may be more strongly controlled by biotic interactions. This research, therefore, adds to understanding on microbial food web interactions in the context of flood and flow pulses in river-floodplain ecosystems.

  18. Education and Training Needs in the Field of Agriculture and Rural Development in the Lower Danube Region

    Directory of Open Access Journals (Sweden)

    Nicolae Istudor

    2010-11-01

    Full Text Available Given the conditions of European Strategy for Labour which was ratified also by Romania, that states an intensifying implementation at national level of labour policies and especially those regarding young person labour market integration, and taking into consideration the great human and agricultural potential of Lower Danube Region, we consider the implementation of national and regional programmes in order to train agriculture and rural development specialists to be very necessary. This article inquires the necessity of training agriculture and rural development specialists within Lower Danube Region in the context of cross-border cooperation between Romania and Bulgaria. This research starts by analysing the European and national legal framework of adult training in those two fields. Subsequently, the main premises and advantages of those activities were emphasized. It is good to mention that the Academy of Economic Studies in Bucharest, Romania, and the D. Tsenov Academy of Economics in Svishtov, Bulgaria, proposed themselves to cooperate in the field of “human resources development – common development of skills and knowledge”. The legal base exists as the Romania-Bulgaria Cross-border Cooperation Programme 2007-2013 is enforced. Furthermore, a four years comparative study of the number of persons trained for the main jobs in rural area, including farmer, in Lower Danube Region was conducted. All these led to the idea that it is necessary to continue and to stress adult training of farmers and rural specialists as a solution for rural economy development and social welfare. Also, comparative analysis of supply and demand of professionals in the field of agriculture was elaborated. The main educational programs in training agriculture and rural development specialists were identified and some problems and perspectives were worked out. This research can be considered as a first step of future deeper and profound collaboration of Tsenov

  19. The intestinal parasite Pomphorhynchus laevis (Acanthocephala) from barbel as a bioindicator for metal pollution in the Danube River near Budapest, Hungary

    International Nuclear Information System (INIS)

    Thielen, F.; Zimmermann, S.; Baska, F.; Taraschewski, H.; Sures, B.

    2004-01-01

    Concentrations of As, Al, Ag, Ba, Bi, Cd, Co, Cr, Cu, Fe, Ga, Mg, Mn, Ni, Pb, Sb, Sn, Sr, Tl, V and Zn were analyzed by inductively coupled mass spectrometry (ICP-MS) in the intestinal helminth Pomphorhynchus laevis and its host Barbus barbus. The fish were caught in the Danube river downstream of the city of Budapest (Hungary). Ten out of twenty one elements analyzed were found at higher concentrations in the acanthocephalan than in different tissues (muscle, intestine, liver and kidney) of barbel. Considering the fish tissues, most of the elements were present at highest concentrations in liver, followed by kidney, intestine and muscle. Spearman correlation analyses indicate that there is competition for metals between the parasites and the host. The negative relationships between parasite number and metal levels in organs of the barbel support this hypothesis. The bioconcentration factors for Ag, As, Ba, Bi, Cu, Ga, Mn, Pb, Sr, Tl, and Zn showed that the parasites concentrated metals to a higher degree than the fish tissues. They accumulated the metals As, Cd, Cu, Fe, Ni, Pb, Sr and Zn even better than established bioindicators such as the mussel Dreissena polymorpha as revealed by data from the literature. The results presented here emphasize that acanthocephalans of fish are very useful as sentinels for metal pollution in aquatic ecosystems. Ratio of metal concentrations in the parasites and the host tissues provide additional information. Not including acanthocephalans in accumulation bioindication studies with fishes (as still customarily done) may lead to false results. - Acanthocephalans of fish may be useful as sentinels of metal pollution in aquatic systems

  20. The chemical behaviour and ecological transfer in human food chain of some radionuclides in aqueous ecosystems and their risk on population health. Part of a coordinated programme on radiological and environmental protection studies in the Danube River catchment area

    International Nuclear Information System (INIS)

    Furnica, G.

    1982-12-01

    The radioecological concentration of H-3, K-40, Sr-90, Cs-137, and Ra-226 in the Danube River catchment area in Romania as well as the migration of these radionuclides in the food chain was determined. It was found that the concentration of each of these radionuclides in the Danube water was very low and that the radioactivity in the food chain was lower than the maximum permissible level. Very low incidence of cancer was detected among the inhabitants along the river

  1. Large-Scale Water Resources Management within the Framework of GLOWA-Danube - Part A: The Groundwater Model

    Science.gov (United States)

    Barthel, R.; Rojanschi, V.; Wolf, J.; Braun, J.

    2003-04-01

    The interdisciplinary research co-operation Glowa-Danube aims at the development of innovative techniques, scenarios and strategies to investigate the impacts of Global Change on the hydrological cycle within the catchment area of the Upper Danube Basin (Gauge Passau). Both the influence of natural changes in the ecosystem, such as climate change, and changes in human behavior, such as changes in land use or water consumption, are considered. A globally applicable decision support tool "DANUBIA" that comprises 15 individual disciplinary models will be developed. The models are connected with each other via customized interfaces that facilitate network-based parallel calculations. The strictly object-oriented DANUBIA architecture was developed using the graphical notation tool UML (Unified Modeling Language) and has been implemented in Java code. The Institute of Hydraulic Engineering of the Universitaet Stuttgart contributes two models to DANUBIA: A groundwater flow and transport model and a water supply model. The latter is dealt with in a second contribution to this conference. This paper focuses on the groundwater model. The catchment basin of the Upper Danube covers an area of approximately 77.000 km2. The elevation difference from the highest peaks of the Alps to the lowest flatlands in the Danube valley is more than 3.000 m. In addition to the Alps, several lower mountain ranges such as the Black Forest, the Swabian and Franconian Alb and the Bavarian Forest are located respectively in the Northeast, North and Northwest of the basin. The climatic conditions, geomorphology, geology and land use show a wide range of different characteristics. The size and heterogeneity of the area make it extremely difficult to represent the natural conditions in a numerical model. Both data availability and accessibility add to the difficulties that one encounters in the approach to simulate groundwater flow and contaminant transport in this area. The groundwater flow model of

  2. The Danube so colourful: A potpourri of plastic litter outnumbers fish larvae in Europe's second largest river

    OpenAIRE

    Lechner, Aaron; Keckeis, Hubert; Lumesberger-Loisl, Franz; Zens, Bernhard; Krusch, Reinhard; Tritthart, Michael; Glas, Martin; Schludermann, Elisabeth

    2014-01-01

    Previous studies on plastic pollution of aquatic ecosystems focused on the world's oceans. Large rivers as major pathways for land-based plastic litter, has received less attention so far. Here we report on plastic quantities in the Austrian Danube. A two year survey (2010, 2012) using stationary driftnets detected mean plastic abundance (n = 17,349; mean ± S.D: 316.8 ± 4664.6 items per 1000 m−3) and mass (4.8 ± 24.2 g per 1000 m−3) in the river to be higher than those of drifting larval fish...

  3. Soil microarthropods and their bioindicator value regarding the bio-edaphic conditions in forest ecosystems of Danube Delta

    Directory of Open Access Journals (Sweden)

    Călugăr A.,

    2016-05-01

    Full Text Available The main objective of this study was to compare soil mesofauna communities in natural and anthropogenic forests from Danube Delta Biosphere Reserve and establish a baseline data in monitoring the disturbed sites. The abundance and diversity of edaphic microarthropods were analyzed in five plots, three of them being natural forests and two plantations (Canada poplar, and respectively willow. The mites from Trombidiformes and Oribatida were closely investigated being identified at family level. Qualitative analysis of edaphic microarthropods evidences numerical dominance of mites, excepting only one stand (Canada poplar plantation. Among mites Oribatida owns the biggest weight (76.6 - 94.1% of the total mites, followed by Trombidiformes or Mesostigmata. Among insects the collembolans hold higher density in the poplar plantation, and the lowest one in the willow plantation. Structure of mites communities differs between the investigated ecosystems both in quantitative and qualitative aspects depending on particular conditions of each plot.

  4. Creative Realization of the Interdisciplinary Approach to the Study of Foreign Languages in the Experience of the Danube Basin

    Directory of Open Access Journals (Sweden)

    Olga Demchenko

    2013-08-01

    Full Text Available The article provides a brief overview of the experience of the Danube Basin universities, with an emphasis on the importance of studying Maritime English as a language of international communication. The phenomenon of “interdisciplinarity” and dominants of the interdisciplinary approach to the study of a foreign language is considered. Due to the need to train competent professionals for the maritime fleet with knowledge of professionally oriented foreign language and the lack of theoretically and practically developed technique with purposeful development of communicative competence with the use of interdisciplinary approach to foreign language learning, some practical experience of the use of interdisciplinary approach as an innovative technology in teaching Maritime English is presented.

  5. Complex hydro- and sediment dynamics survey of two critical reaches on the Hungarian part of river Danube

    International Nuclear Information System (INIS)

    Baranya, Sandor; Jozsa, Janos; Goda, Laszlo; Rakoczi, Laszlo

    2008-01-01

    Detailed hydrodynamic survey of two critical river reaches has been performed from hydro- and sediment dynamics points of view, in order to explore the main features, moreover, provide calibration and verification data to related 3D flow and sediment transport modelling. Special attention has been paid to compare moving and fix boat measurement modes for estimating various flow and large-scale bed form features, resulting in recommendations e.g. on the time period needed in stationary mode operation to obtain sufficiently stabilized average velocity profiles and related parameter estimations. As to the study reaches, the first comprises a 5 km long sandy-gravel bed reach of river Danube located in Central-Hungary, presenting problems for navigation. As a conventional remedy, groyne fields have been implemented to make and maintain the reach sufficiently deep, navigable even in low flow periods. As is usually the case, these works resulted in rather complex flow characteristics and related bed topography at places. The second site is another 5 km long reach of river Danube, close to the southern border to Serbia. There the river presents navigational problems similar to the previously mentioned reach, however, having entirely sand bed conditions, abundant in a variety of dunes, especially in the shallower parts. In both study reaches ADCP measurements were done with around 2.5 Hz sampling frequency both in moving boat operation mode providing overall, though locally moderately representative picture, and in fixed boat mode at a considerable number of selected verticals with 10 minutes long measuring time.

  6. Archéologie(s du Paysage et Paysage Archéologique dans la région du Danube inférieur. Histoire d'un projet, méthodologie, et sélection de quelques résultats

    Directory of Open Access Journals (Sweden)

    PHILIPPE FAJON

    2016-12-01

    Full Text Available Landscape Archaeology(ies and Archaelogical Landscape in the Danubes inferior region. A project history, methodology and a selection of some results. Archaeological practising has changed a lot with the new technologies and new intellectual approaches. IT tools, such as GIS, usually used by geographers may open innovative perspectives, only if archaeologists integrate their thinking in a process of "longue durée" with a special attention to the quality and nature of the information processed. The techniques should not be separated from an epistemological reflection. This is what the archeogeography provides in having an analytical and critical view of the geo-historical objects. To show the status of these issues in Romania, we replace the recent works in the history of the Romanian "national archaeological map". Then, five examples of analyzes of historical and archaeological sites around the Lower Danube Valley suggest five research topics, among others, in the fiel of « understanding the landscape systems » : role of hydraulic systems, notion of landscape stability, resilient landscape elements, landscape planning.

  7. Changes in the state territory, systemic changes, the development of ecological thinking and the issues of the utilisation of hydroelectric power in Hungary

    Directory of Open Access Journals (Sweden)

    HAJDÚ Zoltán

    2012-09-01

    Full Text Available Each big river, including the Danube, makes a single system from their spring to their delta or estuary. Wherever we intervene into the system, this will be necessarily affect the whole of that. Thespillover effects are especially striking in the case of the lower reaches, in the Danube River in the Delta area. The utilisation of the hydroelectric power of the Danube River has been continuously on the agenda in the Hungarian areas since the turn of the 19th and 20th centuries, as an economic, planning, development and thenpolitical and environmental issue. The plans made before the World War I featured hydroelectric plants as the carriers of technical and scientific progress. World War I and the subsequent changes of the state borders swept these plans aside. Between the two world wars, the planning of hydroelectric power stations on the Danube wascontinued within the new state borders, two Hungarian governments and prime ministers of the time were fully committed to the construction of three power plants on the Danube River. After World War II, the hydroelectric plant planned on the Hungarian-Czechoslovakian border and its construction became a basic economic and, from the 1980s, an environmental issue. Finally, only a part of the planned hydroelectric power plant system was constructed, and the issue was not finally closed by specific interpretation of the international law. The Danube Strategy of the European Union, the programmes until 2020, the increase of the role of renewable anergies, the nuclear disaster in Japan, and the interests of international navigation filled the debate with new content. Thepossibility of the construction of hydroelectric power plants on the Danube River was “accidentally” put among the official documents of the government in power since 2010. The government declared it had nothing to do with the plans, and the debate has been going on since then.

  8. Types of Architecture of the Germanic Population and the Roman Army on the Territory North of the Middle Danube during the Marcomannic wars

    Czech Academy of Sciences Publication Activity Database

    Komoróczy, Balázs; Vlach, Marek

    2011-01-01

    Roč. 20, č. 20 (2011), s. 391-404 ISSN 1331-4270 R&D Projects: GA ČR GA404/09/1054 Institutional research plan: CEZ:AV0Z80010507 Keywords : Roman architecture * Germanic architecture * Roman army * Germanic tribes * Roman Period * Marcomannic wars * Middle Danube area * South Moravia * Mušov * Burgstall * Pasohlávky Subject RIV: AC - Archeology, Anthropology, Ethnology http://hrcak.srce.hr/index.php?show=clanak&id_clanak_jezik=118592

  9. Levantamento florístico e fitofisionomia da lagoa Figueira e seu entorno, planície alagável do alto rio Paraná, Porto Rico, Estado do Paraná, Brasil - DOI: 10.4025/actascibiolsci.v25i1.2091 Floristic survey and phytophysiognomy of the Figueira pond in the upper Paraná River floodplain, in Porto Rico, state of Paraná, Brazil - DOI: 10.4025/actascibiolsci.v25i1.2091

    Directory of Open Access Journals (Sweden)

    Maria Conceição de Souza

    2003-04-01

    Full Text Available Foi realizada uma caracterização botânica da lagoa Figueira (planície alagável do alto rio Paraná, Porto Rico, Estado do Paraná, Brasil, a 22o45’36’’S e 53ol5’56’’W, empregando-se levantamentos florísticos e perfis fitofisionômicos em diferentes períodos fluviométricos, além de uma carta batimétrica e análise do solo. O levantamento florístico resultou no reconhecimento de 36 famílias, 75 gêneros e 89 espécies. As famílias de maior riqueza específica foram Poaceae (14 espécies, seguida por Cyperaceae e Euphorbiaceae (oito cada. O porte predominante pertenceu ao herbáceo (79,78% das espécies e, quanto à forma biológica, houve predominância das terrestres (50,56% e das anfíbias (37,08%. A fitofisionomia, com predominância de herbáceas, apresenta diferenciações entre as margens e ao longo da lagoa, havendo uma considerável diminuição da cobertura vegetal no período de águas altas. Essa lagoa foi considerada um corpo de água raso, com solo tipo argilosoA botanical characterization of the Figueira pond (Upper Paraná River floodplain, in Porto Rico, State of Paraná, Brazil, at 22o45’36’’ S and 53ol5’56’’ W has been carried out using floristic surveys and phytophysiognomic profiles, in different water periods, together with a bathymetric chart and a soil analysis. The floristic survey resulted in 36 families, 75 genera and 89 species. The families with more specific richness were Poaceae (14 species, followed by Cyperaceae and Euphorbiaceae (eight each. The highest habit incidence belonged to the herbaceous (79,78% of the species and, concerning the biological form, there was predominance of the terrestrial (50,56% and amphibious ones (37,08%. The phytophysiognomy, with predominance of herbaceous, shows differentiation between the banks and along the pond, with a considerable decrease of the vegetal covering in the high water periods. This pond was considered a shallow body of water, with

  10. Hábitos alimentares e sobreposição trófica das raias Potamotrygon falkneri e Potamotrygon motoro (Chondrichthyes, Potamotrygonidae na planície alagável do alto rio Paraná, Brasil - DOI: 10.4025/actascibiolsci.v28i3.208 Feeding habitats and trophic overlap of the freshwater stingrays Potamotrygon falkneri e Potamotrygon motoro (Chondrichthyes, Potamotrygonidae in the upper Paraná river floodplain, Brazil - DOI: 10.4025/actascibiolsci.v28i3.208

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    Edson Fontes de Oliveira

    2007-11-01

    Full Text Available As raias Potamotrygon falkneri e Potamotrygon motoro foram avaliadas em relação à composição de suas dietas e a sobreposição do nicho trófico nos períodos de seca (agosto/2004 e cheia (janeiro/2005 na planície alagável do alto rio Paraná, em três estações de coleta próximas à ilha Mutum. Foram analisados 49 conteúdos estomacais de P. falkneri e 16 de P. motoro, obtidos de espécimes capturados através de pesca com anzol, fisga (arpão e espinhel. Os conteúdos estomacais foram analisados de acordo com os métodos de freqüência volumétrica e de ocorrência. A similaridade da dieta foi quantificada pelo índice de sobreposição de Pianka. As espécies revelaram flexibilidade alimentar, com ambas consumindo predominantemente moluscos na cheia, enquanto na seca a dieta de P. falkneri foi composta principalmente por peixes e a de P. motoro por insetos aquáticos. Os valores do índice de sobreposição de nicho variaram entre 0,38 na seca (moderado e 0,94 na cheia (acentuado. A variação da composição das dietas foi atribuída à s oscilações na disponibilidade dos recursos alimentares no ambiente.Feeding habits and trophic overlap of freshwater stingrays Potamotrygon falkneri e Potamotrygon motoro were evaluated in the upper Paraná river floodplain. Samples were collected during periods of drought (August/2004 and flood (January/2005 near Mutum island. Fishhook, harpoon and long line were used to capture the individuals and a total of 49 stomach contents of P. falkneri and 16 of P. motoro were analyzed. Diet composition was analyzed by the relative occurrence and volumetric frequencies. The trophic overlap was quantified by the index of niche overlap of Pianka. Results indicated that both species predominantly consumed mollusks during the flood season, while in the drought season the diet of P. falkneri was composed mainly by fish and P. motoro for aquatic insects. The values of the index of niche overlap varied from 0

  11. Copépodes parasitos de fossas nasais de cinco espécies de peixes (Characiformes da planície de inundação do alto rio Paraná, Paraná, Brasil - DOI: 10.4025/actascibiolsci.v29i4.887 Parasitic copepods in the nasal fossae of five fish species (Characiformes from the upper Paraná river floodplain, Paraná, Brazil - DOI: 10.4025/actascibiolsci.v29i4.887

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    Maria de los Angeles Perez Lizama

    2008-02-01

    Full Text Available O presente trabalho teve como objetivo o estudo de copépodes parasitos de fossas nasais de peixes da planície de inundação do alto Rio Paraná. As coletas foram realizadas em diversos pontos da planície nos meses de março, junho e setembro de 2004. Foram coletados 73 exemplares de peixes da ordem Characiformes, de quatro famílias distintas, pertencentes a cinco espécies: Acestrorhynchus lacustris, Prochilodus lineatus, Schizodon borellii, Serrasalmus maculatus e Serrasalmus marginatus. Dentre os 73 peixes examinados, 53 encontravam-se parasitados por copépodes de fossas nasais, variando de 1 a 146 parasitos por peixe. Os parasitos encontrados pertenciam a três espécies conhecidas: Gamidactylus jaraquensis Thatcher & Boeger, 1984; Gamispatulus schizodontis Thatcher & Boeger, 1984 e Rhinergasilus piranhus Boeger & Thatcher, 1988. Diferenças foram observadas nas medidas corporais dos parasitos e na quantidade de espécies de parasitos por espécie de peixe em relação aos copépodes encontrados em estudos anteriores na região amazônica. O presente estudo constitui um dos poucos trabalhos de identificação de copépodes parasitos de fossas nasais de peixes da região Sul do Brazil.The present work had the objective to study parasitic copepods in the nasal fossae of fish from the upper Paraná river floodplain. Fish were captured in different locations of the floodplain in March, June and September, 2004. A total of 73 specimens (Characiformes were collected, belonging to 4 distinct families and 5 species: Acestrorhynchus lacustris (Acestrorhynchidae, Schizodon borellii (Anostomidae, Prochilodus lineatus (Prochilodontidae, Serrasalmus marginatus and Serrasalmus maculatus (Serrasalmidae. Among 73 fishes examined, 53 were parasitized by nasal fossae copepods, varying from 1 to 146 parasites per host. Parasites found belonged to 3 known species: Gamidactylus jaraquensis Thatcher & Boeger, 1984; Gamispatulus schizodontis Thatcher & Boeger

  12. Does the monofilament nylon gillnets catch double more fishes than conventional multifilament gillnets in Danube delta: myth or reality

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    NAVODARU Ion

    2017-12-01

    Full Text Available The monofilament gillnets are prohibited by law for fishing in Romania. There is an untested myth among Romanian fishery stakeholders and folks that monofilament nylon gillnets have double times fishing catch than conventional multifilament gillnets. This myth provoked controversial debated between the fishermen, administrators and conservationist for the regulation purpose. To answer this dilemma in year 2014, fish fauna from Danube delta lakes was sampled with two type of research Nordic gillnets, multifilament (MF gillnets versus monofilament (MO gillnets (European Standard CEN EN14757:2015(E. Both types of fishing gears were randomly assembled from 12 mesh panels with mesh sizes of 5, 6.25, 8, 10, 12.5, 15.5, 19.5, 24, 29, 35, 43, 55 mm knot to knot. To compare fishing efficiency of two types of gillnet, 4 largest lakes inside of the Danube delta, respectively Furtuna, Merhei, Isac and Roșu lakes were sampled. The relative abundance and biomass, standardized as Catch per Unit of Fishing Effort (CPUE, expressed as number or weight per 100 m2 of gillnets per night fishing, were estimated. Accordingly with sampling test, MO gillnets caught in average more than two times more fish in abundance and/or biomass than MF gillnets. The figures are different by species, season and lake. Considering this proven of evidence, it is a policy and societal choice for future MO gillnets fishing regulation. Management regulation of MO gillnets, should consider both, socio-economic benefits and environmental impacts for sustainable use of fish resources. Simply management approach of permitting double efficient MO gillnets for more effectiveness fishing, require at least half decrease of fishing effort or capacities. That means half cutting off of the number of the fishermen permits or fishing time or number of gears or a combination of these measures, in order to maintain at least actual fishing pressure and avoid overfishing risk. Since the result refer to

  13. INAA and chemical analysis of water and sediments sampled in 1996 from the Romanian sector of the Danube river

    International Nuclear Information System (INIS)

    Pantelica, A.; Georgescu, I.I.; Oprica, M.H.I.; Borcia, C.

    1999-01-01

    Water and sediment samples collected during spring 1996 from 20 sampling sites of the Romanian sector of the Danube river and the Black Sea coast were analyzed by instrumental neutron activation analysis (INAA) and by chemical methods to determine major, minor and trace element contents. The concentrations of 43 elements (Ag, Al, As, Au, Ba, Br, Ca, Ce, Cl, Co, Cr, Cu, Cs, Eu, Fe, Ga, Hf, Hg, K, La, Lu, Mg, Mn, Mo, Na, Nd, Ni, Rb, Sb, Sc, Se, Sm, Sr, Ta, Tb, Ti, Th, U, V, W, Yb, Zr, Zn) were investigated by INAA at WWR-S reactor in Bucharest. Chemical methods were used to determine the content of P 2 O 5 and SiO 2 in sediments. For INAA, the water residues and sediment samples were irradiated at the WWR-S reactor in Bucharest at a neutron fluence rate of 2.3·10 12 cm -2 s -1 . As standards, reference materials IAEA-Soil 7 and WTM (sludge from city water treatment, from the Institute of Radioecology and Applied Nuclear Techniques Kosice, Slovakia) as well as chemical compounds of Al, Ca, Mg, V were used. Mono-standard method was applied in the case of Ti and Sr (Cl and Zn as standards, respectively). By chemical methods, the amount of SiO 2 was determined in sediment samples after the treatment with concentrated HCl and residuum dis-aggregation by fusion (melting with a mixture of Na 2 CO 3 and K 2 CO 3 ). Phosphorus was determined by spectrophotometry with ammonium molybdate and by reduction with ascorbic acid. It can be seen that, both for water and sediment samples, the highest contents of Al, Co, Cs, Fe, Rb, and Sb were found at the sites located upstream the Portile de Fier dam: at Turnu Severin (for water) and Orsova (for sediments). Ag, Au, Ni, Yb, Zr were determined only in some of the water samples at the following concentration levels: ng L -1 (Au, Lu), tens of ng L -1 (Ag, Tb, Yb), hundreds of ng L -1 (Ag), μg L -1 (Ni, Zr), tens of μg L -1 (Ni, Ti). From a comparison with results of our previous studies for the Danube bottom sediments, no significant

  14. CRUISERS ON THE DANUBE – THE IMPACT OF LMX THEORY ON JOB SATISFACTION AND EMPLOYEES' COMMITMENT TO ORGANIZATION

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    Irma Erdeji

    2016-12-01

    Full Text Available In the early 21st century, tourist cruises along the Danube River (Corridor 7 experience significant expansion. The main task of cruise companies is the satisfaction of guests, which primarily depends on employee satisfaction affected by numerous organizational factors, including the relationship between the employee and the manager as one of the most important. The aim is to examine how the exchange between leaders and followers affects job satisfaction and employee commitment to the organization, is there a connection between these variables and whether there are differences in the perception by managers and crew members. The study included 41 managers and 25 crew members of the river cruisers. Statistical techniques used in the paper are the descriptive statistics, correlation analysis and MANOVA. The results have shown a positive correlation between the LMX theory (the leader–member exchange theory, job satisfaction and commitment to the organization. Also, the results of the research have shown that there is no statistically significant difference between the perception of LMX exchange in the aspects of leaders and associates, but there is a difference in the perception of job satisfaction and commitment to the organization.

  15. Spatial dependence and correlation of rainfall in the Danube catchment and its role in flood risk assessment.

    Science.gov (United States)

    Martina, M. L. V.; Vitolo, R.; Todini, E.; Stephenson, D. B.; Cook, I. M.

    2009-04-01

    The possibility that multiple catastrophic events occur within a given timespan and affect the same portfolio of insured properties may induce enhanced risk. For this reason, in the insurance industry it is of interest to characterise not only the point probability of catastrophic events, but also their spatial structure. As far as floods are concerned it is important to determine the probability of having multiple simultaneous events in different parts of the same basin: in this case, indeed, the loss in a portfolio can be significantly different. Understanding the spatial structure of the precipitation field is a necessary step for the proper modelling of the spatial dependence and correlation of river discharge. Several stochastic models are available in the scientific literature for the multi-site generation of precipitation. Although most models achieve good performance in modelling mean values, temporal variability and inter-site dependence of extremes are still delicate issues. In this work we aim at identifying the main spatial characteristics of the precipitation structure and then at analysing them in a real case. We consider data from a large network of raingauges in the Danube catchment. This catchment is a good example of a large-scale catchment where the spatial correlation of flood events can radically change the effect in term of flood damage.

  16. The consequences of tourism for a fisherman’s family in Sfântu Gheorghe, the Danube Delta

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    IVAN Oana

    2012-09-01

    Full Text Available This paper examines the operation of a guesthouse owned by a local fisherman in Sfantu Gheorghe, a village in Romania’s Danube Delta. In the context of the regional expansion of tourism, it sheds light on how a local family adapts to new economic conditions. The local family’s life revolves around tourism during the peak season, andunlike other tourist destinations, the members of the family, are the first to benefit from this business. Adopting an anthropological perspective, I examine the role played by each member in this family business to demonstrate how household roles and social relations have been both transformed and maintained in the process of adopting new economic activities to take advantage of emerging opportunities to further household goals of production and reproduction. Even though tourism seems to be an important source of income, this type of activity is close connected to the main subsistence strategy, which is fishing. Furthermore, the tourist season only lasts for two months and so does this particularly work division and organization in the family. Employing participant observation and interview as main research methods, this study looks at how tourism is affecting the local culture, paying particular attention to gender, language, kinship, and work division.

  17. Study of fisheries from riverine Danube Delta: Gorgova – Uzlina and Sontea – Furtuna lake-complexes

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    NAVODARU Ion

    2006-09-01

    Full Text Available The fish catch from riverine Danube delta has changed in both structure and size. The average of catches decreased from 1747 t (1963 - 1974 to 252 t (1992 - 2003 in Gorgova–Uzlina lake-complex and from 1,634 t to 211 t in Sontea–Furtuna lake-complex. The catch decline is effect of loosing of habitats and community structure change due to degradation of habitats. The dominant species – Carassius gibelio and Abramis brama has been yearly sampled since 1990 from the commercial catches for stock assessment. The growth, and exploitation parameters as well as the average biomass and the Maximum Sustainable Yields (MSY based on length frequency structure of landing catch have been estimated. Based on the average catch in the last 13 years (1992-2004 and of the fish stock assessment it resulted that in Gorgova – Uzlina lakes a quantity of 250 tons can be sustainable fished while in Sontea – Furtuna lakes - 210 tones. Lack of fishing effort monitoring and poor quality of catch data has induced uncertainty in stock assessment as well as MSY estimation.

  18. Study of fisheries from fluvio-marine Danube Delta: Matita-Merhei and Rosu-Puiu lake complexes

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    CERNISENCU Irina

    2006-09-01

    Full Text Available The average commercial fish catch decreased from 1,379 tons, in Matita-Merhei complex of lakes and 787 tones in Rosu-Puiu complex of lakes (average catch of 1963-1974 period, to 307 tons, respectively 401 tons average catch of 1992 – 2004 period. In this period piscivorous species like pike, wels catfish, European perch declined and the non-piscivorous species like gibel carp, bream, roach and white bream became dominant. According with the last years state of the fish stocks its estimated that in Rosu-Puiu lakes a sustainable yield of 350 tons could be fished while in Matita – Merhei lakes, approximately 270 tons. The administration of the stocks on the durable principles and implementation of the correct strategy it decisively depends on the quality data concerning the catch size. The lack or unreliable records led to the underestimation or overestimation of some parameters with negative results on the current state and the exploitation of the stocks. The essential error source in stock estimation of both lake complexes is represented by the unrecorded catches of the legal family subsistence quota, black markets and poaching. The real data is very important for accurate assessment of the fish stock. Improvement of the quality of the catch statistics and monitoring of fishing effort are required for sustainable management of Danube delta fisheries.

  19. Water management, environmental protection and spatial planning reconciliation: "Accommodating" the Danube and the Tisa river in Serbia

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    Pihler Vladimir

    2013-01-01

    Full Text Available Water management in Serbia has been mostly operating in a framework of public companies and institutions focused on strictly sectorial and technical expertise on hydraulic engineering, environmental protection and navigable traffic engineering within the highly autonomous legislative framework. On the cross-point of spatial planning and water management there is a growing debate on the important discourses of the policy domains. Seeing rivers as an “accommodated” generator of opportunities is a statement which is opposing the traditional consideration of strict separation of water from the land. Spatial planning as a framework for regulating the land use has an important function in integrating the water management and landscape more closely. In Serbian spatial planning practice there is growing practice of area-specific development planning (reflected through the Spatial plans for the special-purpose areas which are considered to accommodate new ideas on spatiality better than the traditional, sectorial planning documents. The question is placed as to how these practices could direct new spatial arrangements of integrative collaborative spatial planning and not just merely reflect the framework of the existing planning order. This paper seeks the potential and actual role of spatial planning in addressing challenges related to particular river environments on the Tisa and the Danube rivers. The research is based on the analysis of two Spatial plans for the special-purpose areas which are still in conceptual phase - The Cultural landscape of Bač and Multifunctional ecological corridor of the Tisa river.

  20. The diet of wintering Barn Owls (Tyto alba in the region of Histria, the Danube Delta Biosphere Reserve

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    SÁNDOR D. Attila

    2008-10-01

    Full Text Available The Barn Owl (Tyto alba is a common nocturnal predator of agro-ecosystems and it is widely distributed, especially in European countryside. The species uses human artifacts, ruins, barns, attics, towers for breeding and roosting, these sites can provide researchers with hundreds of pellets, thus its diet is well known. A first assessment of the diet and food selection was made for the southern part of the Danube Delta Biosphere Reserve in the wintering period, in a unique wetland-grassland complex, with large areas of steppes. Mammals dominated the diet spectrum, with the shrews (Soricidae being the most frequent (48.3%, followed by the mice (Muridae, and the voles (Arvicolinae. The mammalian component of the diet is important also in terms of biomass (97.8 %. The most valuable species is the Sibling Vole (Microtus epiroticus equalling 25.5 % of all biomass consumed, followed by the Common White-toothed Shrew (Crocidura suaveolens and the Mound-building Mouse (Mus spicilegus. Birds and amphibians made up a small portion of the diet, both in terms of occurrence and of biomass. Three species of birds were captured, the House Sparrow (Passer domesticus being the most important. The results suggest that the Barn Owl is a specialized feeder relying on small mammals and completing its diet with other prey only occasionally.

  1. Tracing of karstic waters in the southern part of the Frankish Alb between the rivers Anlauter, Altmuehl and Danube

    International Nuclear Information System (INIS)

    Behrens, H.; Seiler, K.P.

    1982-01-01

    It is reported about tracing investigations carried out at present in order to detect the passages of waste waters in the Karst of the Southern Frankish Alb. Tracings of karstic waters in the area of karstic watersheds can be performed successfully if the volume of the karstic ground waters equals the small quantities existing in the area between Altmuehl and Anlauter. In this region the karstic watershed is shifted by a strip of about 1 km width. This shift depends on the recharge and volume of the groundwater. All tracings between Altmuehl and Danube, carried out in the area of the karstic water shed, led to negative results, because in this region the volume of the karstic water is particularly large and since consequently the fluorescent tracers are extremely diluted in the waster masses. The amount of tracer material to be recovered ranges below 10%, if the ''most frequent distance velocity'' is below approximately 500 m/d. With higher distance velocities it is sometimes possible to recover more than 50% and even up to 100% of the dyes. (orig.) [de

  2. The influence of environmental abiotic factors on the qualitative and quantitative structure of ichthyofauna from predeltaic Danube area

    Directory of Open Access Journals (Sweden)

    Petronela Georgiana Calin Sandu

    2013-05-01

    Full Text Available The aim of the paper  is to analyse the influence of environmental factors on the capture and fish communities structure from Danube, between Siret River and Prut River mouth. Fish were collected from April to December 2012 in four fishing areas. During the year, 4910 kg, respectively 7121 fish of 31 species were collected. Cyprinidae, the dominant family, 54.84% in term of number of species, was represented by 17 species (Cyprinus carpio, Carassius gibelio, Barbus barbus, Abramis brama, Abramis sapa, Blicca bjoerkna, Leuciscus idus, Vimba vimba, Aspius aspius, Pelecus cultratus, Chondrostoma nasus, Ctenopharingodon idella, Hypophthalmichthys molitrix, Hypophthalmichthys nobilis, Scardinius erythrophthalmus, Rutilus rutilus, Alburnus alburnus. Other families had the following structure: Percidae (16.13% with 5 species (Sander lucioperca, Zingel zingel, Zingel streber, Perca fluviatilis, Gymnocephalus schraetzer, Acipenseridae (12.90% with 4 species (Huso huso, Acipenser stellatus, Acipenser ruthenus, Acipenser gueldenstaedtii, Clupeidae (6.45% with two species (Alosa immaculata, Alosa tanaica, Siluridae (3.23% with one species (Silurus glanis, Esocidae (3.23% with one species (Esox lucius  and Salmonidae (3.23% with one species also (Salmo labrax. The highest capture was 2977.93 kg (60.65%, during the spring season (April-May, followed by autumn season (September–November, with 992.39 kg (20.21%. The water level and water flow showed high correlation with both number and total catch, respectively.

  3. Survival results of a biomass planting in the Missouri River floodplain

    Science.gov (United States)

    W. D. ' Dusty' Walter; John P. Dwyer

    2003-01-01

    A factor essential to successful tree planting in unprotected floodplain environments is survival. Two-year survival results from tree planting in an unprotected floodplain adjacent to the Missouri River are presented. Species planted included silver maple, locally collected cottonwood, and a superior cottonwood selection from Westvaco Corporation. Two spacings, 4 x 4...

  4. Restoration strategies for river floodplains along large lowland rivers in Europe

    NARCIS (Netherlands)

    Buijse, A.D.; Coops, H.; Staras, M.; Jans, L.H.; Van Geest, G.J.; Grift, R.E.; Ibelings, B.W.; Oosterberg, W.; Roozen, F.C.J.M.

    2002-01-01

    1. Most temperate rivers are heavily regulated and characterised by incised channels, aggradated floodplains and modified hydroperiods. As a consequence, former extensive aquatic /terrestrial transition zones lack most of their basic ecological functions. 2. Along large rivers in Europe and North

  5. Restoration strategies for river floodplains along large lowland rivers in Europe

    NARCIS (Netherlands)

    Buijse, A.D.; Coops, H.; Staras, M.; Jans, L.H.; Geest, van G.; Grift, R.E.; Ibelings, B.W.; Oosterberg, W.; Roozen, F.C.J.M.

    2002-01-01

    1. Most temperate rivers are heavily regulated and characterised by incised channels, aggradated floodplains and modified hydroperiods. As a consequence, former extensive aquatic/terrestrial transition zones lack most of their basic ecological functions. 2. Along large rivers in Europe and North

  6. Flow regime effects on mature Populus fremontii (Fremont cottonwood) productivity on two contrasting dryland river floodplains

    Science.gov (United States)

    Andersen, Douglas C.

    2016-01-01

    I compared riparian cottonwood (Populus fremontii) productivity-discharge relationships in a relictual stand along the highly regulated Green River and in a naturally functioning stand along the unregulated Yampa River in semiarid northwest Colorado. I used multiple regression to model flow effects on annual basal area increment (BAI) from 1982 to 2011, after removing any autocorrelation present. Each BAI series was developed from 20 trees whose mean size (67 cm diameter at breast height [DBH]) was equivalent in the two stands. BAI was larger in the Yampa River stand except in 2 y when defoliating leaf beetles were present there. I found no evidence for a Yampa flood-magnitude threshold above which BAI declined. Flow variables explained ∼45% of residual BAI variability, with most explained by current-year maximum 90-d discharge (QM90) in the Yampa River stand and by a measure of the year-to-year change in QM90 in the Green River stand. The latter reflects a management-imposed ceiling on flood magnitude—Flaming Gorge Dam power plant capacity—infrequently exceeded during the study period. BAI in the relictual stand began to trend upward in 1992 when flows started to mimic a natural flow regime. Mature Fremont cottonwoods appear to be ecologically resilient. Their productivity along regulated rivers might be optimized using multiyear environmental flow designs.

  7. Soil fauna of peat-forming wetlands in a natural river floodplain

    Czech Academy of Sciences Publication Activity Database

    Sterzyńska, M.; Pižl, Václav; Tajovský, Karel; Stelmaszczyk, M.; Okruszko, T.

    2015-01-01

    Roč. 35, č. 4 (2015), s. 815-829 ISSN 0277-5212 Institutional support: RVO:60077344 Keywords : biodiversity * disturbance * hydrologic gradient * peatlands * riverine landscape Subject RIV: EH - Ecology, Behaviour Impact factor: 1.504, year: 2015

  8. Morava River floodplain development during the last millennium, Straznicke Pomoravi, Czech Republic

    Czech Academy of Sciences Publication Activity Database

    Kadlec, Jaroslav; Grygar, Tomáš; Světlík, Ivo; Ettler, V.; Mihaljevič, M.; Diehl, J. F.; Beske-Diehl, S.; Svitavská-Svobodová, Helena

    2009-01-01

    Roč. 19, č. 3 (2009), s. 499-509 ISSN 0959-6836 R&D Projects: GA AV ČR IAAX00130801; GA AV ČR IAA3013201 Institutional research plan: CEZ:AV0Z30130516; CEZ:AV0Z4032918; CEZ:AV0Z10480505; CEZ:AV0Z60050516 Keywords : floodplain deposits * river activity reconstruction * last millenium * Morava River (Czech Republic) * expandable clay minerals * Cu-trien analysis * mineral magnetic measurements * lead isotope analysis * Holocene fluvial records * land - use change * pollution sources * isotopic-ratios * clay minerals * soil- erosion Subject RIV: DO - Wilderness Conservation Impact factor: 2.481, year: 2009

  9. Archaeology in the Mississippi River Floodplain at Sand Run Slough, Iowa,

    Science.gov (United States)

    1987-06-01

    relationship inherent in David Braun’s (1983) contention that stronger, thinner-walled Late Woodland pots made extraction of nutrition from hard seeds more...C Ul S i S 1 e 6 ~ S37: TC ?Ii? 5 - I E-cc - 3~Z c E.t S. r- .1 -- t t t4T it S : r Uj w.t t~ e,- E,1 -. SnC ei, e 1 iEdI- C K C -i:C, I ~ -Z eh - a...largest fragments were similar to those found on adult parietal bones. The larger fragments tended to be thicker than the smaller ones, as might have been

  10. Arsenic in groundwater of the Red River floodplain, Vietnam: Controlling geochemical processes and reactive transport modeling

    DEFF Research Database (Denmark)

    Postma, Diederik Jan; Larsen, Flemming; Hue, N.T.M.

    2007-01-01

    The mobilization of arsenic (As) to the groundwater was studied in a shallow Holocene aquifer on the Red River flood plain near Hanoi, Vietnam. The groundwater chemistry was investigated in a transect of 100 piezometers. Results show an anoxic aquifer featuring organic carbon decomposition......(III) but some As(V) is always found. Arsenic correlates well with NH4, relating its release to organic matter decomposition and the source of As appears to be the Fe-oxides being reduced. Part of the produced Fe(II) is apparently reprecipitated as siderite containing less As. Results from sediment extraction...... chemistry over depth is homogeneous and a reactive transport model was constructed to quantify the geochemical processes along the vertical groundwater flow component. A redox zonation model was constructed using the partial equilibrium approach with organic carbon degradation in the sediment as the only...

  11. Geoelectrical Soil Properties of Farmlands Located on Ancient River Floodplains in EL Paso County Texas

    Science.gov (United States)

    Pegues, J. G.; Kaip, G.; Doser, D. I.

    2013-12-01

    Farming in Rio Grande flood plain deposit soils has presented challenges concerning soil salinity, soil drainage and soil collapse. Typical soil forms include Saneli silted clay loam, Harkey loam, Harkey silky loam clay and Tigua silty clay. In the lower valley farmlands of Socorro, TX, cotton and alfalfa are the principal crops, but grain sorghum, corn and vegetable crops also are suitable. Pecan trees, as well as fruit trees suited to the climate, can be grown. Agrarians are faced with varying results of crop yields over relatively small stretches of land; for example, a 22 acre area can contain multiple soil inclusions. This study was conducted on a 22 acre tract of farmland which has recently undergone multiple geophysical testing analyses that include: magnetics, DC resistivity, gravity, and ground penetrating radar. Results will compare flood plain sedimentation qualities to agricultural soil classes through the identification of soil salinity and grain size. This investigation will focus on the testing of geo-electrical soil properties through resistivity assessment. Examination of the sight using a capacity coupled resistivity meter to measure the soil properties over various time periods will be conducted. The results will be compared with the other geophysical data to look for correlations that highlight soil properties.

  12. Sediment deposition and sources into a Mississippi River floodplain lake; Catahoula Lake, Louisiana

    Science.gov (United States)

    Latuso, Karen D.; Keim, Richard F.; King, Sammy L.; Weindorf, David C.; DeLaune, Ronald D.

    2017-01-01

    Floodplain lakes are important wetlands on many lowland floodplains of the world but depressional floodplain lakes are rare in the Mississippi River Alluvial Valley. One of the largest is Catahoula Lake, which has existed with seasonally fluctuating water levels for several thousand years but is now in an increasingly hydrologically altered floodplain. Woody vegetation has been encroaching into the lake bed and the rate of this expansion has increased since major human hydrologic modifications, such as channelization, levee construction, and dredging for improvement of navigation, but it remains unknown what role those modifications may have played in altering lake sedimentation processes. Profiles of thirteen 137Cs sediment cores indicate sedimentation has been about 0.26 cm y− 1 over the past 60 years and has been near this rate since land use changes began about 200 years ago (210Pb, and 14C in Tedford, 2009). Carbon sequestration was low (10.4 g m− 2 y− 1), likely because annual drying promotes mineralization and export. Elemental composition (high Zr and Ti and low Ca and K) and low pH of recent (sediments suggest Gulf Coastal Plain origin, but below the recent sediment deposits, 51% of sediment profiles showed influence of Mississippi River alluvium, rich in base cations such as K+, Ca2 +, and Mg2 +. The recent shift to dominance of Coastal Plain sediments on the lake-bed surface suggests hydrologic modification has disconnected the lake from sediment-bearing flows from the Mississippi River. Compared to its condition prior to hydrologic alterations that intensified in the 1930s, Catahoula Lake is about 15 cm shallower and surficial sediments are more acidic. Although these results are not sufficient to attribute ecological changes directly to sedimentological changes, it is likely the altered sedimentary and hydrologic environment is contributing to the increased dominance of woody vegetation.

  13. The Potential for Dams to Impact Lowland Meandering River Floodplain Geomorphology

    Directory of Open Access Journals (Sweden)

    Philip M. Marren

    2014-01-01

    Full Text Available The majority of the world's floodplains are dammed. Although some implications of dams for riverine ecology and for river channel morphology are well understood, there is less research on the impacts of dams on floodplain geomorphology. We review studies from dammed and undammed rivers and include influences on vertical and lateral accretion, meander migration and cutoff formation, avulsion, and interactions with floodplain vegetation. The results are synthesized into a conceptual model of the effects of dams on the major geomorphic influences on floodplain development. This model is used to assess the likely consequences of eight dam and flow regulation scenarios for floodplain geomorphology. Sediment starvation downstream of dams has perhaps the greatest potential to impact on floodplain development. Such effects will persist further downstream where tributary sediment inputs are relatively low and there is minimal buffering by alluvial sediment stores. We can identify several ways in which floodplains might potentially be affected by dams, with varying degrees of confidence, including a distinction between passive impacts (floodplain disconnection and active impacts (changes in geomorphological processes and functioning. These active processes are likely to have more serious implications for floodplain function and emphasize both the need for future research and the need for an “environmental sediment regime” to operate alongside environmental flows.

  14. Patterns of forest succession and impacts of flood in the Upper Mississippi River floodplain ecosystem

    Science.gov (United States)

    Yin, Y.; Wu, Y.; Bartell, S.M.; Cosgriff, R.

    2009-01-01

    The widespread loss of oak-hickory forests and the impacts of flood have been major issues of ecological interest concerning forest succession in the Upper Mississippi River (UMR) floodplain. The data analysis from two comprehensive field surveys indicated that Quercus was one of the dominant genera in the UMR floodplain ecosystem prior to the 1993 flood and constituted 14% of the total number of trees and 28% of the total basal area. During the post-flood recovery period through 2006, Quercus demonstrated slower recovery rates in both the number of trees (4%) and basal area (17%). In the same period, Carya recovered greatly from the 1993 flood in terms of the number of trees (11%) and basal area (2%), compared to its minor status before the flood. Further analyses suggested that different species responded to the 1993 flood with varying tolerance and different succession strategies. In this study, the relation of flood-caused mortality rates and DBH, fm(d), can be expressed in negative exponential functions for each species. The results of this research also indicate that the growth functions are different for each species and might also be different between pre- and post-flood time periods. These functions indicate different survival strategies and emergent properties in responding to flood impacts. This research enhances our understanding of forest succession patterns in space and time in the UPR floodplain. And such understanding might be used to predict long-term impacts of floods on UMR floodplain forest dynamics in support of management and restoration. ?? 2009 Elsevier B.V.

  15. Sweetgum Blight as Related to Alluvial Soils of the Mississippi River Floodplain

    Science.gov (United States)

    E. Richard Toole; W. M. Broadfoot

    1959-01-01

    A BLIGHT OF UNKNOWN origin and cause has been very common throughout much of the range of sweetgum (Liquidambar styraci flua L.) since 1950. It is characterized by a gradual dying of the tree, often from the top down. The first visible indication is a thinning of a portion of the crown, caused when some buds fail to open and others produce only dwarfed, yellowish...

  16. Characterization of subsurface stratigraphy along the lower American River floodplain using electrical resistivity, Sacramento, California, 2011

    Science.gov (United States)

    Burton, Bethany L.; Powers, Michael H.; Ball, Lyndsay B.

    2014-01-01

    In July 2011, the U.S. Geological Survey, in cooperation with the U.S. Army Corps of Engineers, completed a geophysical survey using electrical resistivity along an approximately 6-mile reach of the lower American River in Sacramento, California, to map near-surface lithological variations. This survey is a part of a manifold and comprehensive study of river-flow dynamics and geologic boundary-property knowledge necessary to estimate scour potential and levee erosion risk. Data were acquired on the left (south or west) bank between river mile 5 and 10.7 as well as a short section on the right bank from river mile 5.4 to 6. Thirteen direct-current resistivity profiles and approximately 8.3 miles of capacitively coupled resisistivity data were acquired along accessible areas of the floodplain between the levee and river bank. Capacitively coupled resistivity was used as a reconnaissance tool, because it allowed for greater spatial coverage of data but with lower resolution and depth of investigation than the DC resistivity method. The study area contains Pleistocene-age alluvial deposits, dominated by gravels, sands, silts, and clays, that vary in both lateral extent and depth. Several generations of lithologic logs were used to help interpret resistivity variations observed in the resistivity models.

  17. Artisanal Fisheries in the Ndumo Area of the Lower Phongolo River Floodplain, South Africa

    Directory of Open Access Journals (Sweden)

    Hendri C. Coetzee

    2015-06-01

    Conservation implications: Given that Ndumo residents predominantly catch fish by means of non-commercial methods, that they do so for reasons of personal consumption and subsistence, and that they mostly target rivers and dams rather than the ecologically sensitive pans in the region, it would seem likely that fishing in the region might be sustainable for the moment. However, it is recommended that studies on the local fish populations and their reproductive rates be conducted so that the actual impact on local fish populations can be determined more accurately. This study serves to provide the necessary baseline data on fish utilisation in the region, which would enable the impact of artisanal fishing on fish reserves in the Ndumo region to be determined once population studies have been completed.

  18. Inter- and intraspecific variation in mercury bioaccumulation by snakes inhabiting a contaminated river floodplain.

    Science.gov (United States)

    Drewett, David V V; Willson, John D; Cristol, Daniel A; Chin, Stephanie Y; Hopkins, William A

    2013-04-01

    Although mercury (Hg) is a well-studied contaminant, knowledge about Hg accumulation in snakes is limited. The authors evaluated Hg bioaccumulation within and among four snake species (northern watersnakes, Nerodia sipedon; queen snakes, Regina septemvittata; common garter snakes, Thamnophis sirtalis; and rat snakes, Elaphe obsoleta [Pantherophis alleghaniensis]) from a contaminated site on the South River (Waynesboro, VA, USA) and two nearby reference sites. Total Hg (THg) concentrations in northern watersnake tail tissue at the contaminated site ranged from 2.25 to 13.84 mg/kg dry weight (mean: 4.85 ± 0.29), or 11 to 19 times higher than reference sites. Blood THg concentrations (0.03-7.04 mg/kg wet wt; mean: 2.24 ± 0.42) were strongly correlated with tail concentrations and were the highest yet reported in a snake species. Within watersnakes, nitrogen stable isotope values indicated ontogenetic trophic shifts that correlated with THg bioaccumulation, suggesting that diet plays a substantial role in Hg exposure. Female watersnakes had higher mean THg concentrations (5.67 ± 0.46 mg/kg) than males (4.93 ± 0.49 mg/kg), but no significant differences between sexes were observed after correcting for body size. Interspecific comparisons identified differences in THg concentrations among snake species, with more aquatic species (watersnakes and queen snakes) accumulating higher mean concentrations (5.60 ± 0.40 and 4.59 ± 0.38 mg/kg in tail tissue, respectively) than the more terrestrial species, garter snakes and rat snakes (1.28 ± 0.32 and 0.26 ± 0.09 mg/kg, respectively). The results of the present study warrant further investigation of potential adverse effects and will aid in prioritizing conservation efforts. Copyright © 2013 SETAC.

  19. Functional and Taxonomic Differentiation of Macrophyte Assemblages Across the Yangtze River Floodplain Under Human Impacts.

    Science.gov (United States)

    Zhang, Min; García Molinos, Jorge; Zhang, Xiaolin; Xu, Jun

    2018-01-01

    Human activities and the consequent extirpations of species have been changing the composition of species assemblages worldwide. These anthropogenic impacts alter not only the richness of assemblages but also the biological dissimilarity among them. One of the main gaps in the assessment of biodiversity change in freshwater ecosystems is our limited understanding regarding how taxonomic and functional facets of macrophyte assemblages respond to human impacts on regional scales. Here, we assess the temporal (before 1970s against after 2000s) changes in taxonomic and functional richness and compositional dissimilarities, partitioned into its turnover and nestedness components, of freshwater macrophyte assemblages across the floodplain lakes of the Yangtze River in China. We found that functional and taxonomic assemblage differentiation occurred simultaneously under increasing human impact, concomitant to a general decrease in functional and taxonomic richness. However, this effect weakened when the historical level of taxonomic dissimilarity among assemblages was high. Macrophyte species with large dispersal range and submersed life form were significantly more susceptible to extirpation. The impact of human activities on differentiation was complex but habitat loss and fishery intensity were consistently the main drivers of assemblage change in these lakes, whereas water quality (i.e., light pollution and nutrient enrichment) had weaker effects. Further, macrophyte taxonomic and functional differentiation was mainly driven by the nestedness component of dissimilarity, accounting for changes in assemblage composition related to changes in species richness independent of species replacement. This result, markedly different from previous studies on freshwater fish assemblages conducted in these lakes, represents a novel contribution toward achieving a more holistic understanding of how human impacts contribute to shape community assemblages in natural ecosystems.

  20. Assessing and optimising flood control options along the Arachthos river floodplain (Epirus, Greece)

    Science.gov (United States)

    Drosou, Athina; Dimitriadis, Panayiotis; Lykou, Archontia; Kossieris, Panagiotis; Tsoukalas, Ioannis; Efstratiadis, Andreas; Mamassis, Nikos

    2015-04-01

    We present a multi-criteria simulation-optimization framework for the optimal design and setting of flood protection structures along river banks. The methodology is tested in the lower course of the Arachthos River (Epirus, Greece), downstream of the hydroelectric dam of Pournari. The entire study area is very sensitive, particularly because the river crosses the urban area of Arta, which is located just after the dam. Moreover, extended agricultural areas that are crucial for the local economy are prone to floods. In the proposed methodology we investigate two conflicting criteria, i.e. the minimization of flood hazards (due to damages to urban infrastructures, crops, etc.) and the minimization of construction costs of the essential hydraulic structures (e.g. dikes). For the hydraulic simulation we examine two flood routing models, named 1D HEC-RAS and quasi-2D LISFLOOD, whereas the optimization is carried out through the Surrogate-Enhanced Evolutionary Annealing-Simplex (SE-EAS) algorithm that couples the strengths of surrogate modeling with the effectiveness and efficiency of the EAS method.

  1. The importance of surrogate habitats in lowland river floodplains for fish community composition

    Czech Academy of Sciences Publication Activity Database

    Ryšavá-Nováková, Michaela; Ondračková, Markéta; Jurajda, Pavel

    2009-01-01

    Roč. 16, č. 6 (2009), s. 468-477 ISSN 0969-997X R&D Projects: GA MŠk LC522 Institutional research plan: CEZ:AV0Z60930519 Keywords : fish community * fish recruitment * flood * rehabilitation * substitute habitats Subject RIV: EH - Ecology, Behaviour Impact factor: 1.264, year: 2009

  2. The Palimpsest of River-Floodplain Management and the Role of Geomorphology

    NARCIS (Netherlands)

    Hudson, Paul F; Middelkoop, Hans

    2015-01-01

    Embanked floodplains are the status-quo where humans are a major component of the environment, especially across Europe and North America. Effective management of embanked rivers requires a comprehensive knowledge of past and present-day geomorphic processes, including sediment transport and channel

  3. The Missouri River Floodplain: History of Oak Forest & Current Restoration Efforts

    Science.gov (United States)

    Daniel C. Dey; Dirk Burhans; John Kabrick; Brain Root; Jennifer Grabner; Mike Gold

    2000-01-01

    Efforts to restore floodplains are complicated by our variable understanding of history and ecology; our lack of knowledge of past environmental and vegetative conditions; and our differing viewpoints of what natural, what the role of humans is in the ecosystem, and what the desirable restored state is. Managers are challenged to decide how to restore native vegetation...

  4. The potential for dams to impact lowland meandering river floodplain geomorphology.

    Science.gov (United States)

    Marren, Philip M; Grove, James R; Webb, J Angus; Stewardson, Michael J

    2014-01-01

    The majority of the world's floodplains are dammed. Although some implications of dams for riverine ecology and for river channel morphology are well understood, there is less research on the impacts of dams on floodplain geomorphology. We review studies from dammed and undammed rivers and include influences on vertical and lateral accretion, meander migration and cutoff formation, avulsion, and interactions with floodplain vegetation. The results are synthesized into a conceptual model of the effects of dams on the major geomorphic influences on floodplain development. This model is used to assess the likely consequences of eight dam and flow regulation scenarios for floodplain geomorphology. Sediment starvation downstream of dams has perhaps the greatest potential to impact on floodplain development. Such effects will persist further downstream where tributary sediment inputs are relatively low and there is minimal buffering by alluvial sediment stores. We can identify several ways in which floodplains might potentially be affected by dams, with varying degrees of confidence, including a distinction between passive impacts (floodplain disconnection) and active impacts (changes in geomorphological processes and functioning). These active processes are likely to have more serious implications for floodplain function and emphasize both the need for future research and the need for an "environmental sediment regime" to operate alongside environmental flows.

  5. River floodplain vegetation classification using multi-temporal high-resolution colour infrared UAV imagery.

    NARCIS (Netherlands)

    van Iersel, W.K.; Straatsma, M.W.; Addink, E.A.; Middelkoop, H.

    2016-01-01

    To evaluate floodplain functioning, monitoring of its vegetation is essential. Although airborne imagery is widely applied for this purpose, classification accuracy (CA) remains low for grassland (< 88%) and herbaceous vegetation (<57%) due to the spectral and structural similarity of these

  6. Polycyclic aromatic hydrocarbons in soil of the Canadian River floodplain in Oklahoma

    Science.gov (United States)

    Sartori, F.; Wade, T.L.; Sericano, J.L.; Mohanty, B.P.; Smith, K.A.

    2010-01-01

    The accumulation of polycyclic aromatic hydrocarbons (PAH) in soil, plants, and water may impart negative eff ects on ecosystem and human health. We quantified the concentration and distribution of 41 PAH (n = 32), organic C, total N, and S (n = 140) and investigated PAH sources using a chronosequence of floodplain soils under a natural vegetation succession. Soil samples were collected between 0- and 260-cm depth in bare land (the control), wetland, forest, and grassland areas near a closed municipal landfill and an active asphalt plant (the contaminant sources) in the north bank of the Canadian River near Norman, OK. Principal component, cluster, and correlation analyses were used to investigate the spatial distribution of PAH, in combination with diagnostic ratios to distinguish pyrogenic vs. petrogenic PAH suites. Total PAH concentration (??PAH) had a mean of 1300 ng g-1, minimum of 16 ng g-1, and maximum of 12,000 ng g-1. At 0- to 20-cm depth, ??PAH was 3500 ?? 1600 ng g-1 (mean ?? 1 SE) near the contaminant sources. The most common compounds were nonalkylated, high molecular weight PAH of pyrogenic origin, i.e., fluoranthene (17%), pyrene (14%), phenanthrene (9%), benzo(b)fluoranthene (7%), chrysene (6%), and benzo(a)anthracene (5%). ??PAH in the control (130 ?? 23 ng g -1) was comparable to reported concentrations for the rural Great Plains. Perylene had a unique distribution pattern suggesting biological inputs. The main PAH contamination mechanisms were likely atmospheric deposition due to asphalt production at the 0- to 20-cm depth and past landfill operations at deeper depths. Copyright ?? 2010 by the American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America. All rights reserved.

  7. The impact of nitrogen contamination and river modification on a Mississippi River floodplain lake

    Energy Technology Data Exchange (ETDEWEB)

    Karthic, Indu [Box 1099 Environmental Sciences Program, Southern Illinois University, Edwardsville, IL 62026 (United States); Brugam, Richard B., E-mail: rbrugam@siue.edu [Box 1651 Department of Biological Sciences, Southern Illinois University, Edwardsville, IL 62026 (United States); Retzlaff, William [Box 1099 Environmental Sciences Program, Southern Illinois University, Edwardsville, IL 62026 (United States); Johnson, Kevin

    2013-10-01

    Anthropogenic nitrogen contamination has increased in ecosystems around the world (frequently termed the “nitrogen cascade”). Coke production for steel manufacturing is often overlooked as a source of nitrogen to natural ecosystems. We examined sediment cores from a Horseshoe Lake, a floodplain lake located just East of St. Louis Missouri (USA) to test whether a coking plant effluent could be traced using stable isotopes of nitrogen and diatom microfossils. The distribution of δ{sup 15}N values in surface sediment samples from the lake shows the highest values near the coking plant effluent. Stable isotopes of nitrogen from 4 sediment cores using a mixing model showed three sources of nitrogen since 1688 CE. The first source (active between 1688 and 1920 CE) had a calculated δ{sup 15}N value ranging between − 0.4 and 1.1‰ depending on the core. After 1920 a second source with a δ{sup 15}N ranging between 10.6 and 15.4‰ became active. The change in these sources coincides with the construction of a coking plant on the lake shore. A third source with a value approximately 7.0‰ was present at all times and represents background. The diatom microfossil assemblages present from 1688 CE to the late 1800s are dominated by the planktonic species Aulacoseira granulata and periphytic and benthic genera Gomphonema, Cocconeis, and Lyrella. After the late 1800s the diatom assemblages are dominated by Staurosira species indicating a shift of species from high flow riverine environments to epipelic species from a lake environment. Diatom microfossils seem to track the reduction in flooding due to leveeing of the floodplain and the isolation of the lake from the river. Our results show how stable isotopes of nitrogen can be used to track nitrogen inputs from industrial sources. Diatom changes corresponded with changes in connectivity between the Mississippi River and its floodplain. - Highlights: • Effluent from a steel plant increases fixed nitrogen input to a floodplain lake. • Isotopes of nitrogen in the lake surface sediment show the location of effluent. • Simple binary mixing model reconstructs the isotope signature of nitrogen sources. • Diatoms from sediment cores show a history of flooding—not eutrophication.

  8. The impact of nitrogen contamination and river modification on a Mississippi River floodplain lake

    International Nuclear Information System (INIS)

    Karthic, Indu; Brugam, Richard B.; Retzlaff, William; Johnson, Kevin

    2013-01-01

    Anthropogenic nitrogen contamination has increased in ecosystems around the world (frequently termed the “nitrogen cascade”). Coke production for steel manufacturing is often overlooked as a source of nitrogen to natural ecosystems. We examined sediment cores from a Horseshoe Lake, a floodplain lake located just East of St. Louis Missouri (USA) to test whether a coking plant effluent could be traced using stable isotopes of nitrogen and diatom microfossils. The distribution of δ 15 N values in surface sediment samples from the lake shows the highest values near the coking plant effluent. Stable isotopes of nitrogen from 4 sediment cores using a mixing model showed three sources of nitrogen since 1688 CE. The first source (active between 1688 and 1920 CE) had a calculated δ 15 N value ranging between − 0.4 and 1.1‰ depending on the core. After 1920 a second source with a δ 15 N ranging between 10.6 and 15.4‰ became active. The change in these sources coincides with the construction of a coking plant on the lake shore. A third source with a value approximately 7.0‰ was present at all times and represents background. The diatom microfossil assemblages present from 1688 CE to the late 1800s are dominated by the planktonic species Aulacoseira granulata and periphytic and benthic genera Gomphonema, Cocconeis, and Lyrella. After the late 1800s the diatom assemblages are dominated by Staurosira species indicating a shift of species from high flow riverine environments to epipelic species from a lake environment. Diatom microfossils seem to track the reduction in flooding due to leveeing of the floodplain and the isolation of the lake from the river. Our results show how stable isotopes of nitrogen can be used to track nitrogen inputs from industrial sources. Diatom changes corresponded with changes in connectivity between the Mississippi River and its floodplain. - Highlights: • Effluent from a steel plant increases fixed nitrogen input to a floodplain lake. • Isotopes of nitrogen in the lake surface sediment show the location of effluent. • Simple binary mixing model reconstructs the isotope signature of nitrogen sources. • Diatoms from sediment cores show a history of flooding—not eutrophication

  9. The Contributions of the Economic Press from the Lower Danube to the Development of Romanian Culture and Literature during 1846 - 1915

    Directory of Open Access Journals (Sweden)

    Cristina Dosuleanu

    2012-12-01

    Full Text Available This paper presents some of the research conducted on the Lower Danube Press. In itsdevelopment it was intended to reveal important elements of the publication, in the economic domain,but also the contributions of the newspapers to the Romanian literature. The economic activityparticularly intense in the Lower Danube area resulted in the release of a large number of magazinesthat supported this activity. The first magazine in Galati was published in 1846, called theDunărea/Danube. Its content came in the support of the merchants, who dealt with trade, agricultureand navigation asMercur/Mercuryin Braila, following another publication in 1849 of economic fromGalati,Jurnalul de Galaţi/Galati Journal. These first publications have in common their release inseveral European languages of interest to traders: Italian, it was preferred as it used the Latin alphabetand it was easier to print the publication, Greek or French. In this category of papers there werereleased newspapers of scholarships, commercial clubs, as an expression of the concerns of suchmembers, among whom there were also the cultural ones. It was also highlighted the fact that thesepublications have contributed to the evolution of the Romanian language but also of literature, ofcourse at a lower level than the literary publications. There have been discovered also publicationsthat had nothing to do with literature or economic, financial or literary phenomena, their purposebeing only publishing documents regulating the economic activities, one example being theSemaphore de Brăila/Semaphore of Braila. It was also noted the involvement of the authorities in thepromotional activities of the economy through various publications with the title of calendars,monitors, or daily newspapers, which had a modest culturalcontribution. Compared with other typesof publications, the economic ones are the most numerous, as the ones from the political domain.

  10. Magnetic stratigraphy of the Danube loess: A composite Titel-Stari Slankamen loess section over the last one million years in Vojvodina, Serbia

    Science.gov (United States)

    Song, Yang; Guo, Zhengtang; Marković, Slobodan; Hambach, Ulrich; Deng, Chenglong; Chang, Lin; Wu, Jianyu; Hao, Qingzhen

    2018-04-01

    In Europe, the most complete loess-paleosol sequences over the past million years are preserved in the Serbian part of the Danube River drainage basin. The similarity in stratigraphy and climatic cycles between the Serbian and the Chinese loess sequences suggests that the loess deposits in these two regions could play an important role in the study of intercontinental climatic correlations and linkage. However, previous magnetostratigraphic studies of the Serbian loess, mainly conducted using the alternating field (AF) demagnetization approach, show significant differences with the Chinese loess, especially the stratigraphic positioning of the Matuyama-Brunhes boundary (MBB). Here, we conduct a detailed magnetostratigraphic investigation of a composite Titel-Stari Slankamen loess section in the Vojvodina (northern Serbia), using thermal and hybrid demagnetization methods, aiming to establish new chronological constraints for the Danube Basin loess. Based on the analyses of the mineral magnetic properties, anisotropy of magnetic susceptibility, progressive thermal and hybrid demagnetization, the MBB was determined within S8, broadly consistent with the MBB position seen in the Chinese loess. Present evidence supports the hypothesis that the overall normal polarity in the upper part of L9, with a thickness of 2.1 m, was possibly caused by a combination of the remagnetization of remanence-carrying coarse-grained magnetite during the Brunhes normal chron and bioturbation during the forming of the overlying paleosol S8. Thus, our magnetostratigraphic results provide solid chronological evidence for the coherence of pedostratigraphy and climatostratigraphy for the loess deposits in the Danube Basin and China. The synchronous occurrence of the strongest developed paleosol S5 (corresponding to MISs 15-13) and the least weathered thick loess unit L9 (corresponding to MISs 24-22) in the two regions confirms that extreme climatic events during these two intervals are possibly

  11. Improvement of Professional Training of Maritime Fleet Specialists: Experience of Interactive Technologies Introduction in the Danube Institute of National University «Odessa Maritime Academy»

    Directory of Open Access Journals (Sweden)

    Olga Demchenko

    2016-08-01

    Full Text Available The article focuses on the coverage of the most effective methods and technologies on improving communicative skills during the professional training of maritime fleet specialists. A complex study of skills formation process for communication in a foreign language in the Danube Institute of National University «Odessa Maritime Academy» has identified its the most problematic areas. In the result of using interactive technologies («brainstorming», project techniques, etc. was established positive dynamics in formation of skills of professional communication.

  12. Results of investigating the macroinvertebrate community of the Danube River on the sector upstream from the Iron Gate (km 1083-1071

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    Paunović Momir M.

    2005-01-01

    Full Text Available The present work cites results of investigating aquatic macroinvertebrates of the Danube River on the sector upstream from the Iron Gate (KM 1083-1071. The investigated part is interesting from the hydrobiological standpoint above all due to differences of faunal composition in relation to higher sections that could be expected in view of differences in overall characteristics of the river. A rich macroinvertebrate community (84 taxa was observed. The diversity of taxa is primarily a result of habitat diversity within the given stretch. Oligochaeta and Mollusca were the principal components.

  13. PRESENCE OF THE MOST ECONOMICALLY IMPORTANT FISH SPECIES IN THE RIVER DANUBE AND ITS FLOOD ZONES IN SERBIA

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    Zoran Marinović

    2012-12-01

    Full Text Available On the basis of the data published between 1983 and 2008, this paper shows presence of tench (Tinca tinca, carp (Cyprinus carpio, pike (Esox lucius, catfish (Silurus glanis, zander (Sander lucioperca and sterlet (Acipenser ruthenus in the Gornje Podunavlje and Koviljsko-Petrovaradinski Rit Special Nature Reserves and the Begečka Jama Nature Park, as well as in the part of the Danube’s bed between river kilometre 1249- and 1255. The number of these fish species in the River Danube and its flood zones in this part of the Pannonian Basin is decreasing due to the use of inappropriate “tools”, electric current, uncontrolled agricultural and industrial waste dumps, degradation of the habitat. The above mentioned species deserve attention because, according to the Rulebook on declaration and protection of protected and strictly protected wild species of plants, animals and fungi of 2010, in Serbia, T. tinca is a strictly protected species, while C. carpio, E. lucius, S. glanis, S. lucioperca and A. ruthenus are listed as protected. On the basis of the 2009 Fisheries Law in Serbia, permanently closed fishing season was introduced for tench, and closed season in certain periods and fishing ban for individuals under the prescribed size for the rest of the above mentioned species. A. ruthenus is subject to the Law on Ratification of Convention on International Trade in Endangered Species of Wild Fauna and Flora (CITES, ANNEX II and is listed in the category of species that may be in danger of extinction. Furthermore, it can be found on the IUCN Red List of Endangered Species of the International Union for Conservation of Nature – VU, which means that it is marked as vulnerable.

  14. New data regarding the migration of spoonbills (Platalea leucorodia breeding in the Danube Delta, based on color ring resightings

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    KISS J. Botond

    2007-10-01

    Full Text Available Based on our previous knowledge the Spoonbills breeding in Europe follow three main migratory routes towards Africa. Populations from the western part of the continent follow the East Atlantic coast of Europe, passing through Gibraltar and winter in Western Africa. The Central European populations fly south to Italy, Sicily, then are crossing the Mediterranean Sea towards Tunis, Libya, Israel and Egypt, sometimes flying over the Sahara desert as far as to Eastern- and Central Africa . Spoonbills from Eastern Europe follow the coast of the Black and Marmora Seas, then the eastern coast of the Mediterranean, where some are spending the winter. Others reach EastAfrica or even go further east to Iran or India. A color marking study – using engraved PVC rings – was launched in 2002, to follow the migration of Spoonbills breeding in the Danube Delta. From the 219 birds ringed 20 were resighted totalizing 23 observations. These recent resightings suggest a post breeding movement and migratory route with much a broader angle – between Spain in the west and Oman in the east. The birds were observed in 10 countries from Europe, Africa and Asia. The observation of a color ringed individual at Biharugra, Hungary early in migration indicates a true postbreeding dispersal towards north-east. Other resightings in Croatia and Italy suggest an orientation towards the main migratory route of the Central European population. The resighting of an individual in Spain indicates population exchanges even with Western European spoonbills, moreover as birds from Romania were observed in Tunisia together with spoonbills from Western and Central European populations. We consider that in the future especially using colorringing or satellite telemetry we may understand much better the migratory pathways of Spoonbills from Romania.

  15. The influence of the Danube-Odra-Elbe water canal project on the geobiocoenoses of floodplain forests (Czech Republic

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    Ivo Machar

    2010-01-01

    Full Text Available This arcticle deals with influence of the proposed Danube-Odra-Elbe (DOL water canal on the floodplain forests in the Czech Republic. The project of the DOL water canal is evaluated with using GIS methods and reference assessment of environmental effects. Biogeographic differentiation of the landscape in a biogeocenological concept have been also utilized in this paper. The presented paper has shown the possibilities of use of the GIS analysis for the assessment of the assumed effect of the DOL project on the hydrological regime of floodplain forests. It has been proven that this method is much more efficient in objectivizing the presupposed influences of the DOL canal on the water regime of floodplain forests than the previous assessments. The method employed in this paper for the purposes of the preliminary percentage quantification of the extent of the hydrological in­fluen­ce on individual types of geobiocoenoses of floodplain forests is used generally for the purposes of the environmental assessment of effects on investment plans concerning the landscape (the so-called EIA. It is clear that the assessment of the influences of the DOL project on floodplain forest geobiocoenoses primarily concerns the response of vegetation to changes in the soil moisture regime, which can be compared to the amount of data material (for a summary see PRAX et al., 2008. Results indicate that the potential construction of the DOL canal would significantly, i.e. with an influence value exceeding 50 %, affect 634 km2 of the area of inundations in lowland floodplains in the Czech Republic. Results are discussed in the frame of knowledge about water regime of floodplain forests ecosystems.

  16. Sources and transport of carbon and nitrogen in the River Sava watershed, a major tributary of the River Danube

    Energy Technology Data Exchange (ETDEWEB)

    Ogrinc, Nives [Department of Environmental Science, Jozef Stefan Institute, Jamova 39, 1000 Ljubljana (Slovenia)], E-mail: nives.ogrinc@ijs.si; Markovics, Roland; Kanduc, Tjasa [Department of Environmental Science, Jozef Stefan Institute, Jamova 39, 1000 Ljubljana (Slovenia); Walter, Lynn M. [Department of Geological Science, University of Michigan, 1018 C. C. Little Building, Ann Arbor, MI 48109-1063 (United States); Hamilton, Stephen K. [Kellogg Biological Station, Michigan State University, 3700 E. Gull Lake Drive, Hickory Corners, MI 49060-9516 (United States)

    2008-12-15

    Carbon and nitrogen dynamics were examined throughout the River Sava watershed, a major tributary of the River Danube, in 2005 and 2006. The River Sava exported 2.1 x 10{sup 11} mol C/yr as dissolved inorganic carbon (DIC), and emitted 2.5 x 10{sup 10} mol C/yr as CO{sub 2} to the atmosphere. Stable carbon isotope ratios indicate that up to 42% of DIC originated from carbonate weathering and {approx}23% from degradation of organic matter. Loads of dissolved and particulate organic carbon increased with discharge and export rates were calculated to be 2.1 x 10{sup 10} mol C/yr and up to 4.1 x 10{sup 9} mol C/yr, respectively. Isotopic compositions ({delta}{sup 13}C and {delta}{sup 15}N) and C/N ratios indicated that soil organic matter was the dominant source of particulate organic matter for 59% of the samples. Eighteen percent of the samples were dominated by plankton, 12% by periodic inputs of fresh terrestrial plant detritus with C/N > 15, and about 11% of the samples were dominated by the contribution of aquatic vascular plants. Nitrate inputs were controlled by land use in the River Sava watershed. {delta}{sup 15}N{sub NO{sub 3}} values <6 per mille were found in predominantly forested watersheds, while values >6 per mille typically represented watersheds with a higher percentage of agricultural and/or urban land use. Elevated {delta}{sup 15}N{sub NO{sub 3}} values (up to +25.5 per mille) at some sites were probably due to the combined effects of low-flow and inputs from sewage and/or animal waste.

  17. Diazotrophy in alluvial meadows of subarctic river systems.

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    Thomas H DeLuca

    Full Text Available There is currently limited understanding of the contribution of biological N2 fixation (diazotrophy to the N budget of large river systems. This natural source of N in boreal river systems may partially explain the sustained productivity of river floodplains in Northern Europe where winter fodder was harvested for centuries without fertilizer amendments. In much of the world, anthropogenic pollution and river regulation have nearly eliminated opportunities to study natural processes that shaped early nutrient dynamics of large river systems; however, pristine conditions in northern Fennoscandia allow for the retrospective evaluation of key biochemical processes of historical significance. We investigated biological N2 fixation (diazotrophy as a potential source of nitrogen fertility at 71 independent floodplain sites along 10 rivers and conducted seasonal and intensive analyses at a subset of these sites. Biological N2 fixation occurred in all floodplains, averaged 24.5 kg N ha(-1 yr(-1 and was down regulated from over 60 kg N ha(-1 yr(-1 to 0 kg N ha(-1 yr(-1 by river N pollution. A diversity of N2-fixing cyanobacteria was found to colonize surface detritus in the floodplains. The data provide evidence for N2 fixation to be a fundamental source of new N that may have sustained fertility at alluvial sites along subarctic rivers. Such data may have implications for the interpretation of ancient agricultural development and the design of contemporary low-input agroecosystems.

  18. Organic carbon and nitrogen export from a tropical dam-impacted floodplain system

    Science.gov (United States)

    Zurbrügg, R.; Suter, S.; Lehmann, M. F.; Wehrli, B.; Senn, D. B.

    2013-01-01

    Tropical floodplains play an important role in organic matter transport, storage, and transformation between headwaters and oceans. However, the fluxes and quality of organic carbon (OC) and organic nitrogen (ON) in tropical river-floodplain systems are not well constrained. We explored the quantity and characteristics of dissolved and particulate organic matter (DOM and POM, respectively) in the Kafue River flowing through the Kafue Flats (Zambia), a tropical river-floodplain system in the Zambezi River basin. During the flooding season, > 80% of the Kafue River water passed through the floodplain, mobilizing large quantities of OC and ON, which resulted in a net export of 69-119 kg OC km-2 d-1 and 3.8-4.7 kg ON km-2 d-1, 80% of which was in the dissolved form. The elemental C : N ratio of ~ 20, the comparatively high δ13C values of -25‰ to -21‰, and its spectroscopic properties (excitation-emission matrices) showed that DOM in the river was mainly of terrestrial origin. Despite a threefold increase in OC loads due to inputs from the floodplain, the characteristics of the riverine DOM remained relatively constant along the sampled 410-km river reach. This suggests that floodplain DOM displayed properties similar to those of DOM leaving the upstream reservoir and implied that the DOM produced in the reservoir was relatively short-lived. In contrast, the particulate fraction was 13C-depleted (-29‰) and had a C : N ratio of ~ 8, which indicated that POM originated from phytoplankton production in the reservoir and in the floodplain, rather than from plant debris or resuspended sediments. While the upstream dam had little effect on the DOM pool, terrestrial particles were retained, and POM from algal and microbial sources was released to the river. A nitrogen mass balance over the 2200 km2 flooded area revealed an annual deficit of 15 500-22 100 t N in the Kafue Flats. The N isotope budget suggests that these N losses are balanced by intense N-fixation. Our

  19. Organic carbon and nitrogen export from a tropical dam-impacted floodplain system

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    R. Zurbrügg

    2013-01-01

    Full Text Available Tropical floodplains play an important role in organic matter transport, storage, and transformation between headwaters and oceans. However, the fluxes and quality of organic carbon (OC and organic nitrogen (ON in tropical river-floodplain systems are not well constrained. We explored the quantity and characteristics of dissolved and particulate organic matter (DOM and POM, respectively in the Kafue River flowing through the Kafue Flats (Zambia, a tropical river-floodplain system in the Zambezi River basin. During the flooding season, > 80% of the Kafue River water passed through the floodplain, mobilizing large quantities of OC and ON, which resulted in a net export of 69–119 kg OC km−2 d−1 and 3.8–4.7 kg ON km−2 d−1, 80% of which was in the dissolved form. The elemental C : N ratio of ~ 20, the comparatively high δ13C values of −25‰ to −21‰, and its spectroscopic properties (excitation-emission matrices showed that DOM in the river was mainly of terrestrial origin. Despite a threefold increase in OC loads due to inputs from the floodplain, the characteristics of the riverine DOM remained relatively constant along the sampled 410-km river reach. This suggests that floodplain DOM displayed properties similar to those of DOM leaving the upstream reservoir and implied that the DOM produced in the reservoir was relatively short-lived. In contrast, the particulate fraction was 13C-depleted (−29‰ and had a C : N ratio of ~ 8, which indicated that POM originated from phytoplankton production in the reservoir and in the floodplain, rather than from plant debris or resuspended sediments. While the upstream dam had little effect on the DOM pool, terrestrial particles were retained, and POM from algal and microbial sources was released to the river. A nitrogen mass balance over the 2200 km2 flooded area revealed an annual deficit of 15 500–22 100 t N in

  20. High sensitive multiresidue analysis of pharmaceuticals and antifungals in surface water using U-HPLC-Q-Exactive Orbitrap HRMS. Application to the Danube river basin on the Romanian territory

    NARCIS (Netherlands)

    Chitescu, C.L.; Kaklamanos, George; Nicolau, A.I.; Stolker, Linda

    2015-01-01

    The occurrence of 67 pharmaceutical and antifungal residues in the Danube river on the Romanian territory was studied by using solid-phase extraction (SPE) and LC-Q Exactive Orbitrap high resolution MS in both full scan (FS) MS and targeted MS/MS modes. A single-laboratory validation procedure

  1. Interactive Ways of Becoming a Specialist Fine Art of the Ukrainian Danube Region

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    Ivan Pastyr

    2016-08-01

    Full Text Available In modern conditions the method of education is especially effective if it is built on the intensification of mental activity and is aimed at developing a creative personality. The study presents a system of interactive ways of becoming a specialist in Izmail State Liberal Arts University.

  2. The Creation and Development of Innovative Infrastructure in the Danube Countries

    OpenAIRE

    Liudmila Rosca-Sadurschi

    2014-01-01

    Entrepreneurship development is supported by a developed infrastructure or innovative infrastructure. The purpose of the business infrastructure is to create favorable conditions for its development by providing support in various areas, complete and targeted to businesses. Training system infrastructure provides creation and development of innovation infrastructure objects. Thus, this article will conduct a comparative analysis of the elements of innovation infrastructure and how...

  3. The concentration of active and inactive strontium in some Danube river samples

    International Nuclear Information System (INIS)

    Koshutich, K.; Lulich, S.

    1985-01-01

    The following fish species were investigated: Barbus barbus, Acipencer ruthenus, Abramis brama, Stizostedion lucioperca, Silurus glanis, Cyprinus caprio. The samples were collected during 1981. The inactive strontium in the water residue (after evaporation), sediment and fishes ewrw determined by nondestructive neutron activation analysis by using gamma couting system consisted of a 40 cm 3 Ge(Li) semiconductor rystal attached to a 4096-channel pulsehight analyser. The standard solution contained 5x10 -5 g of strontium per 100 lambda. Radioactive strontium was measured after several separation procedures. 90 SrCO 3 in equilibrium with its daughter 90 Y was detected in the β-low-level counting anticoincident system with gas-flow detector. The results confirmed the literature data that the sediment concentrations of the total strontium and the active 90 Sr are several times greater than those in water

  4. The Creation and Development of Innovative Infrastructure in the Danube Countries

    Directory of Open Access Journals (Sweden)

    Liudmila Rosca-Sadurschi

    2014-08-01

    Full Text Available Entrepreneurship development is supported by a developed infrastructure or innovative infrastructure. The purpose of the business infrastructure is to create favorable conditions for its development by providing support in various areas, complete and targeted to businesses. Training system infrastructure provides creation and development of innovation infrastructure objects. Thus, this article will conduct a comparative analysis of the elements of innovation infrastructure and how their development in different countries. Innovation infrastructure elements analyzed are: information infrastructure refers to access to information; Financial infrastructure refers to financial resources; infrastructure, staff training (qualified staff; material and technical infrastructure; infrastructure consulting (expert consultation; marketing infrastructure.

  5. Hydraulic characterisation of karst systems with man-made tracers

    International Nuclear Information System (INIS)

    Werner, A.

    1998-01-01

    Tracer experiments using man-made tracers are common in hydrogeological exploration of groundwater aquifers in karst systems. In the present investigation, a convection-dispersion model (multidispersion model with consideration of several flow paths) and a single-cleft model (consideration of the diffusion between the cleft and the surrounding rock matrix) were used for evaluating tracer experiments in the main hydrological system of the saturated zone of karst systems. In addition to these extended analytical solutions, a numerical transport model was developed for investigating the influence of the transient flow rate on the flow and transport parameters. Comparative evaluations of the model approaches for the evaluation of tracer experiments were made in four different karst systems: Danube-Aach, Paderborn, Slowenia and Lurbach, of which the Danube-Aach system was considered as the most important. The investigation also comprised three supplementary experiments in order to enable a complete hydraulic characterisation of the system. (orig./SR) [de

  6. Spatial relationships of levees and wetland systems within floodplains of the Wabash Basin, USA

    Science.gov (United States)

    Bray, E. N.; Morrison, R. R.; Nardi, F.; Annis, A.; Dong, Q.

    2017-12-01

    Given the unique biogeochemical, physical, and hydrologic services provided by floodplain wetlands, proper management of river systems should include an understanding of how floodplain modifications influences wetland ecosystems. The construction of levees can reduce river-floodplain connectivity, yet it is unclear how levees affect wetlands within a river system, let alone the cumulative impacts within an entire watershed. This paper explores spatial relationships between levee and floodplain wetland systems in the Wabash basin, United States. We used a hydrogeomorphic floodplain delineation technique to map floodplain extents and identify wetlands that may be hydrologically connected to river networks. We then spatially examined the relationship between levee presence, wetland area, and other river network attributes within discrete HUC-12 sub-basins. Our results show that cumulative wetland area is relatively constant in sub-basins that contain levees, regardless of maximum stream order within the sub-basin. In sub-basins that do not contain levees, cumulative wetland area increases with maximum stream order. However, we found that wetland distributions around levees can be complex, and further studies on the influence of levees on wetland habitat may need to be evaluated at finer-resolution spatial scales.

  7. A History of Pebbles and Silt – Fluvial Sediment Transport, Hydropower and Technical Expertise at the Austrian Danube and its Tributaries

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    Schoder Angelika

    2016-08-01

    Full Text Available The paper investigates experts’ perceptions of hydropower, sediment regime, and their interaction in the 20th century with an environmental historical approach, based on various case studies at both the Danube River and one of its tributaries, and on a review of contemporary literature authored by engineers. Results show that questions of sediment continuity have engaged planners of hydropower plants since the advent of this technology, and decisions were at any time influenced by multiple interests (navigation, electricity demand, nature conservation. In such an intricate fluvial landscape, phenomena like reservoir sedimentation and riverbed incision can be approached as “legacies” of past technical interventions, which limit the options of current and future river management.

  8. Investigations of the Anopheline (Diptera: Culicidae fauna from three areas belonging to the Danube Delta Biosphere Reserve in order to evaluate the risk of malaria re-emergence

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    FALCUTA Elena

    2008-10-01

    Full Text Available The survey focused on the comparative analyses of the anopheline fauna belonging to the maculipennis group between three areas of the Danube Delta Biosphere Reserve, two of them situated near theRazim-Sinoe lagoonal complex and one belonging to the fluvial delta. The study that was carried out during 2006 and 2007 intended to establish the composition of the anopheline fauna as well as the longevity of the various species in order to evaluate the risk of malaria re-emergence. A number of 2437 mosquitoes, belonging to Anopheles maculipennis group were collected. The presence of the former vector species was pointed up: Anopheles atroparvus, Anophelesmesseae and Anopheles maculipennis sensu stricto. The investigations of the number of egg batches laid by a female have shown the physiological age of the respective female and namely if the female could infect or not the humans.

  9. STUDY UPON THE MACROZOOBENTHIC COMMUNITIES FROM THE DANUBE RIVER BY BAZIAŞ-PORŢILE DE FIER SECTOR (SOUTH-WESTERN ROMANIA

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    ADINA-MIRELA PANĂ

    2009-01-01

    Full Text Available Different sensitivity of benthic macroinvertebrates was used in determining water quality of the eight major tributaries of the Danube, which drains two mountain ranges: Locvei and Almăjului, within the context in which the macrozoobenthic community is influenced by changes in the qualitative parameters of aquatic ecosystems. To get an overview, a series of physical- chemical parameters (water temperature, pH, oxygen, conductivity, cyanide, nitrites, nitrates, phosphates was studied in parallel with the study of benthic community. Elevated abundance of benthic groups in the case of water quality characteristic (Ephemeroptera, Trichoptera, Plecoptera, Amphipoda, along with their high frequency in all the monitored tributaries in the present study and the water quality parameters maintained within normal limits fits these lotic ecosystems in the A class of surface water quality.

  10. Invasiveness assessment of the Chinese mitten crab Eriocheir sinensis (H. Milne Edwards, 1853 in the Serbian section of the river Danube

    Directory of Open Access Journals (Sweden)

    Škraba Dubravka

    2013-01-01

    Full Text Available The Chinese mitten crab Eriocheir sinensis is listed in The Global Invasive Species Database and the IUCN Register as one of “100 of the world’s worst invasive alien species”. It has been reported in Serbia since 1995 in the Danube River, suggesting a predominantly human-aided dispersal. The risk of invasiveness posed by the Chinese mitten crab to aquatic ecosystems in Serbia, assessed using the FI-ISK (Freshwater Invertebrate Invasiveness Scoring Kit, v1.19, revealed a final score of 37. This shows a high potential of invasiveness, mainly due to its versatile ecological and biological features in a climate similar to that in the donor area. FI-ISK assessment revealed the alleged environmental impact of Chinese mitten crab in Serbia to be of much greater impact on aquaculture than previously assumed.

  11. THE CONFLICTS ON THE ROMANIAN-UKRAINIAN BORDER, A STRUGGLE FOR THE DANUBE MOUTHS OR AN INHERITANCE FROM THE SOVIET PERIOD?

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    CSABA M. KOVÁCS

    2015-12-01

    Full Text Available The Conflicts on the Romanian-Ukrainian Border, a Struggle for the Danube Mouths or an Inheritance from the Soviet Period ? The dispute between Romania and Ukraine has a complex nature and goes back to the history preceding the existence of both national states. The territory belonging today to Romania, Ukraine and Moldova used to be a buffer zone between the Ottoman, Russian and Habsburg Empires, and the frontier line changed very often even in modern times. However, the present border disputes between Romania and Ukraine were inherited from the communist period (1948-1989, as the bilateral agreements did not follow exactly the terms of the Paris Treaty of 1947. The consequences emerged after 1997 when, in spite of a new official border treaty with Ukraine, Romania had to address the ICJ from the Hague on the matter of the Black Sea shelf.

  12. Ecologisation of the agricultural Danubian Region on the concrete territory in the part between Danube river-bed and derivation canal

    International Nuclear Information System (INIS)

    Davidova, T.

    1997-01-01

    The construction of the hydroelectric power constructions Gabcikovo changed the landscape near the Danube river. After the construction of the supply and falling-off canals with the hydroelectric power plant the artificial island with three seats were formed. This territory has high ecologic quality with good developed organisation of the bio-centers, bio-corridors and interaction elements with the specifically oriented agriculture. In this territory the development of the socio-economic activities were substantially limited regard to the protection of the water sources, protection of the forests, protected territories of the nature and communication accessibility. Therefore, the centre of the gravity of the territory development must be oriented in the ecology

  13. Intraplate volcanism in the Danube Basin of NW Hungary: 3D geophysical modelling of the Late Miocene Pásztori volcano

    Science.gov (United States)

    Pánisová, Jaroslava; Balázs, Attila; Zalai, Zsófia; Bielik, Miroslav; Horváth, Ferenc; Harangi, Szabolcs; Schmidt, Sabine; Götze, Hans-Jürgen

    2017-12-01

    Three-dimensional geophysical modelling of the early Late Miocene Pásztori volcano (ca. 11-10 Ma) and adjacent area in the Little Hungarian Plain Volcanic Field of the Danube Basin was carried out to get an insight into the most prominent intra-crustal structures here. We have used gridded gravity and magnetic data, interpreted seismic reflection sections and borehole data combined with re-evaluated geological constraints. Based on petrological analysis of core samples from available six exploration boreholes, the volcanic rocks consist of a series of alkaline trachytic and trachyandesitic volcanoclastic and effusive rocks. The measured magnetic susceptibilities of these samples are generally very low suggesting a deeper magnetic source. The age of the modelled Pásztori volcano, buried beneath a 2 km-thick Late Miocene-to-Quaternary sedimentary sequence, is 10.4 +/- 0.3 Ma belonging to the dominantly normal C5 chron. Our model includes crustal domains with different effective induced magnetizations and densities: uppermost 0.3-1.8 km thick layer of volcanoclastics underlain by a trachytic-trachyandesitic coherent and volcanoclastic rock units of a maximum 2 km thickness, with a top situated at minimal depth of 2.3 km, and a deeper magmatic pluton in a depth range of 5-15 km. The 3D model of the Danube Basin is consistent with observed high ΔZ magnetic anomalies above the volcano, while the observed Bouguer gravity anomalies correlate better with the crystalline basement depth. Our analysis contributes to deeper understanding of the crustal architecture and the evolution of the basin accompanied by alkaline intraplate volcanism.

  14. Fish –based diet- correlations between metabolism of carbohydrates, lipidis and proteins. Study case population of the Sulina Town, Danube Delta

    Directory of Open Access Journals (Sweden)

    Georgiana ENE

    2016-06-01

    Full Text Available According to literature data, the normal values of biochemical parameters in blood vary by sex, age, geographical region, and type of diet. The aim of this study was to analyze the benefits of a fish-based diet among the population of Sulina, in the Danube Delta (3,663 individuals, by performing a comparative hepatic evaluation, lipid profile, serum glucose levels and total protein profile of these patients. Fish is an important source of protein with high biological value, containing all essential aminoacids and low lipid levels. The novelty of the research is represented by the analyzed geographical area. The Danube Delta had no medical analysis laboratory until 2010, when the RoutineMed Sulina laboratory was opened. Patients had a set of biochemical tests in the RoutineMed Sulina laboratory and declared they eat fish or fish-based products at least once a week. Tests were performed on 200 patients for the evaluation of the liver of these patients: Aspartate Amino Transferase, alanine amino transferase, de Ritis ratio, High Density Lipoprotein, Low Density Lipoprotein, total lipids, total cholesterol, triglycerides and 200 tests for the evaluation of the serum glucose levels and total protein. Both women and men were involved in the research and patients were grouped into age ranges: 20-40 years, 40-60 years, > 60 years. The values obtained were statistically analyzed using the SPSS v. 20 software and then compared to the ranges considered normal for these parameters. The results obtained showed that patients with a fish-based diet seem to be healthier than those with a diet in which fish meat is scarce, as their blood biochemical parameters values are closer to normal, which leads to the conclusion that including fish and fish products in people's regular diet is beneficial in preventing lipid, protein and carbohydrate metabolism disorders and preserving the overall health of the body.

  15. Historiographical reflections on local and transit trade relations on the Prut-Dniester area and the Lower Danube (late 13th - 14th century

    Directory of Open Access Journals (Sweden)

    Silvia Barcari

    2013-12-01

    Full Text Available Due to the geographical position of the Prut-Dniester and the Lower Danube regions, there were lying the important trade routes and the important transit trade was carried out that in some ways contributed to their economic development. Through Transylvania and Wallachia there passed trade route linking the Western and Central Europe with the Black Sea region and the Balkan Peninsula and reaching the cities of the Adriatic coast; through the area of future Moldova there passed a road connecting the Baltic and the Black Seas. In transit trade there were involved Italian merchants from the Levant, Armenian merchants of Poland, and Transylvanian Saxons, who traded here "overseas goods": from the East - pepper, spices, from Western and Central Europe - cloth, linen, weapons, agricultural tools. In return, foreign merchants were buying in these areas cattle, horses, hides, wax, grain, etc. Need in money, especially the fractional coins often needed in small business transactions, has led to cutting coins into equal parts and stamping local imitations of foreign coins. In the 14th century in the mouth of the Danube there is attested the existence of "banks" and "bankers" engaged in exchange of money. Trading activity was stimulated by the transit of goods on major trade routes of Europe, as well as the opening of the local market for high-quality goods of the European market. The expansion of trade exchange contributed to the economic prosperity of the independent Romanian states and increasing of their military power that brought them to the international political arena.

  16. Using QMRAcatch - a stochastic hydrological water quality and infection risk model - to identify sustainable management options for long term drinking water resource planning

    Science.gov (United States)

    Derx, J.; Demeter, K.; Schijven, J. F.; Sommer, R.; Zoufal-Hruza, C. M.; Kromp, H.; Farnleitner, A.; Blaschke, A. P.

    2017-12-01

    River water resources in urban environments play a critical role in sustaining human health and ecosystem services, as they are used for drinking water production, bathing and irrigation. In this study the hydrological water quality model QMRAcatch was used combined with measured concentrations of human enterovirus and human-associated genetic fecal markers. The study area is located at a river/floodplain area along the Danube which is used for drinking water production by river bank filtration and further disinfection. QMRAcatch was previously developed to support long term planning of water resources in accordance with a public infection protection target (Schijven et al., 2015). Derx et al. 2016 previously used QMRAcatch for evaluating the microbiological quality and required virus-reduction targets at the study area for the current and robust future "crisis" scenarios, i.e. for the complete failure of wastewater treatment plants and infection outbreaks. In contrast, the aim of this study was to elaborate future scenarios based on projected climate and population changes in collaboration with urban water managers. The identified scenarios until 2050 include increased wastewater discharge rates due to the projected urban population growth and more frequent storm and overflow events of urban sewer systems following forecasted changes in climate and hydrology. Based on the simulation results for the developed scenarios sustainable requirements of the drinking water treatment system for virus reductions were re-evaluated to achieve the health risk target. The model outcomes are used to guide practical and scientifically sound management options for long term water resource planning. This paper was supported by FWF (Vienna Doctoral Program on Water Resource Systems W1219-N22) and the GWRS project (Vienna Water) as part of the "(New) Danube-Lower Lobau Network Project" funded by the Government of Austria and Vienna, and the European Agricultural Fund for Rural

  17. Turbidity retrieval and monitoring of Danube Delta waters using multi-sensor optical remote sensing data: An integrated view from the delta plain lakes to the western-northwestern Black Sea coastal zone

    OpenAIRE

    Guttler, Fabio; Niculescu, Simona; Gohin, Francis

    2013-01-01

    Based on multi-sensor optical remote sensing techniques, more than 80 medium and high spatial resolution satellite images were used for studying the turbidity patterns of Danube Delta waters. During a selected 4-year temporal coverage (2006 to 2009), the turbidity gradients were simultaneously analyzed in the delta plain lakes and in the Black Sea western-northwestern coastal zone. Two distinct, but complementary, methodologies for retrieving turbidity were employed, one for the lakes and the...

  18. The 90Sr, 137Cs, 3H and 131I content in surface water and sediments of the Danube, Olt and Arges river and in milk samples for the year 1972

    International Nuclear Information System (INIS)

    Podeanu, G.; Iancu, E.

    1975-01-01

    The radioactivity of the measured radionuclides in water decreased from their discharge into the Danube to the mouth of the river. The amounts of certain radioisotopes in water samples, sediments, and milk are far below the maximum permissible concentrations. With some exceptions, the radioactivity of 137 Cs is lower than that of 90 Sr. With some exceptions, the highest values for the radionuclides studied were measured during the summer months. (orig./RW) [de

  19. Technical water system of the Reactor - Design description, operation regime and manipulation

    International Nuclear Information System (INIS)

    Badrljica, R.

    1984-05-01

    Technical water, reactor secondary coolant system is made of four parts: pumping station on the Danube; sedimentation facility in the village Vinca; coolant, heat exchangers and other elements within the RA reactor building; leading outer pipes and the stream Mlaka. All the four parts are connected to form a functional entirety, and each of them connected to cooling heat exchangers forms a partial functional system which enable the whole system to fulfill its fundamental task [sr

  20. Synergy between LIDAR and RADARSAT-2 images for the recognition of vegetation structures in the coastal wetlands of the Danube Delta

    Science.gov (United States)

    Niculescu, Simona; Lardeux, Cédric; Grigoras, Ion; Hanganu, Jenica; David, Laurence

    2014-05-01

    Wetlands are among the most productive environments in the world and are characterized by exceptional biological diversity. Despite their indisputable importance, these environments remain among the most endangered ecosystems in the world due to drainage, drying out, pollution or overexploitation of resources. The Danube Delta, a coastal wetland of the Black Sea, cannot escape these dangers and, to preserve its resources, it has been declared a Biosphere Reserve (in 1993). The biodiversity of this area is remarkable and it possesses one of the largest reed in the world (a continuous 2,700 km² reed cover). The main goal of this project is to determine, characterize and derive functional descriptors of the vegetation structures, Phragmites australis species of the Danube Delta being the most prevalent. For this purpose, this project aims, on the one hand, at interpreting LIDAR measurements (acquired in May 2011) in conjunction with RADARSAT-2 satellite observations (acquired in early June 2011) and, on the other hand, at validating the results obtained by the introduction of the spectral measurements of the main vegetation classes into a Spectral Angle Mapper algorithm applied to a SPOT-5 image (May 2011). The LIDAR data allow the assessment of vegetation height with an accuracy of a few centimeters. Hence, the various vegetation layers can be accurately mapped. However, the differentiation of the various vegetation formations within a same layer requires the contribution of complementary data sources such as RADARSAT-2 data. The radar measurements are derived using the C band (λ wavelength = 5.3 cm) providing additional information on the vegetation cover structure with regard to roughness, moisture and biomass. The simultaneous acquisition of HH, HV and VV polarizations allows the differentiation of the areas according to their response to different polarizations by establishing their polarimetric signatures. Based on these raw data, we were able to derive other

  1. Review Article: Souls, Hearts and Heritage: Passing from the Danube to the Hudson. Szegedy-Maszák, Marianne. 2013. I Kiss Your Hands Many Times – Hearts, Souls and Wars in Hungary. New York: Spiegel & Grau, Random House. 345 pp; and Griesz, Katherine. 2012. From the Danube to the Hudson. Seattle, WA: CreateSpace Independent Publishing. 482 pp.

    Directory of Open Access Journals (Sweden)

    Evi Blaikie

    2015-01-01

    Full Text Available How did the rich and the super-rich Hungarian Jews in Budapest fare during the 1930s, World War II and the Holocaust, and beyond? Two new books deal with their stories: Marianne Szegedy-Maszák's "I Kiss Your Hands Many Times" and Katherine Griesz's "From the Danube to the Hudson". Szegedy-Maszák was able to use her journalist's profession and skills to explore and vividly present her family's story in a work that can likewise satisfy the historians, the romantics and all those who like a “good read.” Griesz’s epic family memoir encompasses the same time period and topic as Szegedy-Maszák's book in its portrayal of a multi-generational Hungarian Jewish family's fate in the crisis -full mid-twentieth century, as seen and interpreted by its female descendant decades later.

  2. Chromosome mutagenesis in populations of aquatic biota in the Black Sea, Aegean Sea and Danube and Dnieper rivers, 1986-1989

    International Nuclear Information System (INIS)

    Tsytsugina, V.G.

    1991-01-01

    We studied the level of structural mutagenesis in the reproductive and somatic cells of aquatic biota of various taxa from natural populations of neustic and benthic communities in the Black and Aegean Seas and the Dnieper and Danube rivers between 1986 and 1989. The cytogenetic research covered embryos, larvae and adult worms of Nereidae, Naididae, Tubificidae and Turbellaria, adult Sagitta setosa, young Bivalvia molluscs, embryos of Mysidacea, and growing roe of Engraulis encrasicholus, Sprattus sprattus, Diplodus annularis, Mullus barbatus, Trachurus trachurus, Scophthalmus maeoticus, Abramis brama, Blicca bjoerkna, Rutilus rutilus and Stizostedion lucioperca. It was established that aquatic biota in the open waters of the Black and Aegean Seas had a lower level of chromosome mutagenesis than representatives of the fluvial communities. The intensity of mutagenesis was compared with the data published in the literature on radioactive contamination/chemical pollution of the aqueous medium in these areas. The paper sets out statistical regularities in chromosome mutagenesis (inter-individual variability in the chromosome aberration rate and distribution of chromosome damage in cells), noting different patterns of chromosome aberration distribution among cells. On the basis of a large quantity on our own data from field and experimental cytogenetic studies involving aquatic biota, the paper considers the possibility of using - for the purposes of radiochemical-ecological monitoring - chromosome damage distribution in cells as an indicator of whether mutagens are radiation-related or not. (author)

  3. Attitudes and Prerequisites for the Establishment of an Integrated Cultural Identity within Romanian-Bulgarian Cross-Border Region along the Danube River

    Directory of Open Access Journals (Sweden)

    Juliana Popova

    2013-08-01

    Full Text Available Objectives: On the basis of the results from an empirical study this research aims at exploration of the prerequisites for the establishment of an integrated cultural identity within Romanian-Bulgarian Cross-Border Region along the Danube River (RBCBR. Prior Work: The paper is trying to prove the necessity of identity re-negotiation process within RBCBR. The theoretical background of the research is related to some of the most topical considerations in this scientific field. Approach: The research uses an interdisciplinary approach and combines the perspectives of regional studies, cross-cultural psychology and intercultural communication. A representative survey is the main instrument of the research. Results: Among the citizens of the RBCBR there exist favourable attitudes towards closer relations with their neighbours which can serve as a key element of the identity re-negotiation process within the region. Implications: The research results can be used by policy makers and regional authorities in the process of establishment of a new policy for territorial cooperation as well as by researchers in further development of this topic area. Value: the importance of the research is in its new approach towards the establishment of integrated regional identity as well as in the comparison of the Romanian and Bulgarian attitudes towards cooperation in the neighbourhood area.

  4. QUANTITATIVE AND QUALITATIVE EVALUATION OF ICHTHYOPLANKTON IN THE ROSCI0066 DANUBE DELTA - THE MARIN AREA SITE – A CASE STUDY IN VERNAL SEASON 2012

    Directory of Open Access Journals (Sweden)

    Carmen Georgeta Nicolae

    2014-06-01

    Full Text Available Ichthyoplankton are the eggs and larvae of fish and is a component of the trophic spectrum of different consumers, but also is a new ichtyofauna for aquatic ecosystem. To assess the qualitative and quantitative structure of the ichthyoplankton in ROSCI0066 site, in vernal season 2012, the samples were collected using Bongo net in six stations (Sfantu Gheorghe, Zaton, Sahalin, Periteasca, Sulina, Portita. For each particular station were recorded the data like: date when the sample was taken; the geographical coordinates of the station; water depth (m; the number of revolutions of the net. The biological samples were stored in 4% formaldehyde and analyzed in the laboratory. To estimate the number of spawn and larvae per m2 was used Tanaka's formula, by taking into consideration: the sampling depth, the surface net, the number of revolutions of the flow meter, the volume of filtered water (m3, number of spawn or larvae collected. Ichthyoplankton results are expressed in number of individuals/sample and individuals m-2 and for juveniles in numbers/trawling and individuals m-2. In the ROSCI0066 Danube Delta - the Marin Area site, in vernal season 2012, it is found that the diversity of species in the samples analyzed is very low, being identified only four species of fish from the Engraulidae, Clupeidae, Mullidae and Gobiidae families. According to the results, sprat prefers the south of the Romanian Black Sea coast and is prevalent in evidence by the presence of eggs and anchovy by the presence of larvae.

  5. MODIS-based multi-parametric platform for mapping of flood affected areas. Case study: 2006 Danube extreme flood in Romania

    Directory of Open Access Journals (Sweden)

    Craciunescu Vasile

    2016-12-01

    Full Text Available Flooding remains the most widely distributed natural hazard in Europe, leading to significant economic and social impact. Earth observation data is presently capable of making fundamental contributions towards reducing the detrimental effects of extreme floods. Technological advance makes development of online services able to process high volumes of satellite data without the need of dedicated desktop software licenses possible. The main objective of the case study is to present and evaluate a methodology for mapping of flooded areas based on MODIS satellite images derived indices and using state-of-the-art geospatial web services. The methodology and the developed platform were tested with data for the historical flood event that affected the Danube floodplain in 2006 in Romania. The results proved that, despite the relative coarse resolution, MODIS data is very useful for mapping the development flooded area in large plain floods. Moreover it was shown, that the possibility to adapt and combine the existing global algorithms for flood detection to fit the local conditions is extremely important to obtain accurate results.

  6. Application of biological markers for the identification of oil-type pollutants in recent sediments: Alluvial formation of the Danube river, Oil refinery Pančevo

    Directory of Open Access Journals (Sweden)

    Rašović Aleksandar S.

    2002-01-01

    Full Text Available The purpose of this paper was to examine to which extent the abundance and distribution of certain biological markers may be used for the identification of oil-type pollutants in recent sediments and ground waters. The samples were taken from the area of the Oil Refinery Pančevo (alluvial formation of the Danube River. The organic matter of the investigated samples was isolated using an extraction method with chloroform. The group composition and usual biological markers were analyzed in the obtained extracts. n-Alkanes and acyclic isoprenoids, pristane and phytane were analyzed using gas chromatographie (GC analysis of saturated hydrocarbons. Polycyclic alkanes of the sterane and terpane type were analyzed using gas chromatography-mass spectrometry (GC-MS, i.e. by analyzing the carbamide non-adduct of the total alkane fraction (Single Ion Monitoring SIM-technique. The obtained results indicate that n-alkanes can be used for the identification of oil-type pollutants (for example, if the oil-pollutant is biodegraded or present in very low concentrations, and steranes and triterpanes can be used as very reliable indicators of oil-type pollution in recent sediments and ground waters.

  7. Application of Deep Learning of Multi-Temporal SENTINEL-1 Images for the Classification of Coastal Vegetation Zone of the Danube Delta

    Science.gov (United States)

    Niculescu, S.; Ienco, D.; Hanganu, J.

    2018-04-01

    Land cover is a fundamental variable for regional planning, as well as for the study and understanding of the environment. This work propose a multi-temporal approach relying on a fusion of radar multi-sensor data and information collected by the latest sensor (Sentinel-1) with a view to obtaining better results than traditional image processing techniques. The Danube Delta is the site for this work. The spatial approach relies on new spatial analysis technologies and methodologies: Deep Learning of multi-temporal Sentinel-1. We propose a deep learning network for image classification which exploits the multi-temporal characteristic of Sentinel-1 data. The model we employ is a Gated Recurrent Unit (GRU) Network, a recurrent neural network that explicitly takes into account the time dimension via a gated mechanism to perform the final prediction. The main quality of the GRU network is its ability to consider only the important part of the information coming from the temporal data discarding the irrelevant information via a forgetting mechanism. We propose to use such network structure to classify a series of images Sentinel-1 (20 Sentinel-1 images acquired between 9.10.2014 and 01.04.2016). The results are compared with results of the classification of Random Forest.

  8. Macroinvertebrates and fishes in the part of the Danube flowing through the Iron Gate national park and possibilities of their protection under in situ and ex situ conditions

    Directory of Open Access Journals (Sweden)

    Simić Vladica M.

    2004-01-01

    Full Text Available Comparison of the results of later investigations of the Danube in the part flowing through in the Iron Gate (Đerdap National Park with those of research conducted earlier (20 to 40 years ago shows that changes have occurred in regard to the presence and especially the abundance of certain hydrobionts on this sector of the river, a finding that applies to all groups examined. The paper discusses the potential and results of conservation measures realized through both legal regulations and medium-term plans for the advancement of fishing in this region. In addition to in situ study during the period from 1999 to 2003, a large number of species (especially of macroinvertebrates and fish were also investigated under artificial conditions (in the Kragujevac Aquarium in order to gain a better understanding of their ecological characteristics, especially their sensitivity to various environmental stress factors. The presented results indicate that weight of specimens and success of culturing under ex situ conditions are correlated with their sensitivity under natural conditions.

  9. Inundation and draining of the Trinity River floodplain associated with extreme precipitation from Hurricane Harvey, east Texas, USA

    Science.gov (United States)

    Hassenruck-Gudipati, H. J.; Goudge, T. A.; Mohrig, D. C.

    2017-12-01

    Rivers swelled up beyond their historic high-water marks due to precipitation from Hurricane Harvey. We used Harvey-induced flooding to investigate the flow connectivity between the coastal Trinity River and its floodplain by measuring water depth and velocity, as well as sediment-transporting conditions on the natural levee that separates the two. River discharge within the study area peaked at a historic high of 3600 cubic meters per second on September 1, 2017. The levees on two river bends were investigated on September 3 and 4 in order to characterize the hydraulic connectivity between the channel and its floodplain during the early falling limb of this flood. On September 3, a river bend located approximately 28km upstream of the river mouth was visited. Water was overtopping the levee crest at this location, 30m away from the levee crest. This overland flow only experienced about a threefold reduction in average velocity to 0.16 m/s (in 2.2 m of water) 600m away from the levee crest. On September 4, a river bend approximately 59km upstream of the river mouth was investigated. Even though the river stage was at the National Weather Service major flood stage, the levee crest separating the river and floodplain was emergent. Regardless of this local disconnect between the river and its floodplain, substantial and variable drainage velocities were measured depending on drainage patterns controlled by local topography. Velocities measured in shallow water immediately adjacent to the emergent levee were low (< 0.05 m/s in 0.2 m of water). The highest drainage velocity ( 0.18 m/s in 1.7 m of water) associated with the upstream river-bend was measured at 750m from the channel and was similar in magnitude to those recorded for the distal inundating overland flow a day before on the downstream river-bend. Results from this work highlight the maintenance of high flow velocities across the distal floodplain even during its drainage phase. The transport of sediment, detrital organics, and solutes will be explored within the context of these overland flow velocities.

  10. Diet and dietary overlap of three sympatric fish species in lakes of the upper Paraná River floodplain

    Directory of Open Access Journals (Sweden)

    Karla Danielle Gaspar da Luz

    1999-01-01

    Full Text Available For a dietary study, specimens of Astyanax bimaculatus, Astyanax schubarti, and Moenkhausia intermedia were caught monthly with seines-nets in six lakes (Pau Veio, Porto Rico, Três Amigos, Mutum, Pontal, and Canal do Meio, on the floodplain of the Upper Paraná River, from March 1992 through February 1993. We analyzed stomach contents of 599 A. bimaculatus, 293 A. schubarti, and 394 M. intermedia, by the Occurrence and Points methods, combined in the Alimentary Index (AI. This analysis revealed that these species have broad dietary spectra. A. bimaculatus was an omnivore, with a tendency toward herbivory-insectivory. In most of the lakes it consumed terrestrial insects, followed by higher plants and microcrustaceans. A. schubarti was an omnivore, consuming the same type of items in the different lakes, in different proportions depending on the locality. M. intermedia was a planktophage, feeding mainly on cladocerans (more than 50% in all the lakes except for Pontal, where higher plants were predominant (45.1%. Although A. bimaculatus and A. schubarti consumed similar items in the different localities, detrended correspondence analysis (DCA showed distinct segregation among the three species in all lakes studied.Para estudo da dieta foram capturados mensalmente exemplares de Astyanax bimaculatus, Astyanax schubarti e Moenkhausia intermedia com redes de arraste, em seis lagoas (Pau Velho, Porto Rico, Três Amigos, Mutum, Pontal e Canal do Meio, na planície de inundação do alto rio Paraná, de março/92 a fevereiro/93. Foram analisados 599 conteúdos gástricos de A. bimaculatus, 293 de A. schubarti e 394 de M. intermedia, pelos métodos de Ocorrência e Pontos, combinados no Índice Alimentar (IAi. Tal análise revelou que estas espécies apresentam amplo espectro alimentar. A. bimaculatus foi caracterizada como onívora com tendência a herbivoria-insetivoria, consumindo, na maioria das lagoas, insetos terrestres, seguidos de vegetal superior e microcrustáceos. A. schubarti foi caracterizada como onívora, consumindo os mesmos tipos de itens nas diferentes lagoas, com proporções distintas, dependendo do local. M. intermedia foi caracterizada como planctófaga, alimentando-se principalmente de Cladocera (mais de 50% em todas as lagoas, exceto na Pontal, onde vegetal superior se sobressaiu (com 45,1%. Embora A. bimaculatus e A. schubarti tenham consumido itens semelhantes nos diferentes locais, a análise de correspondência destendenciada (DCA evidencia uma nítida segregação entre as três espécies em todas as lagoas estudadas.

  11. Diversity and genetic distance in populations of Steindachnerina in the upper Paraná river floodplain of Brazil.

    Science.gov (United States)

    Oliveira, A V; Prioli, A J; Prioli, S M A P; Pavanelli, C S; Júlio, H F; Panarari, R S

    2002-08-01

    Whereas four species of the genus Steindachnerina occur in the Paraná river basin, S. insculpta was the only endemic species of the region under analysis, which is the third lower section of the upper Paraná river. Among other factors, this species has been characterised by the absence of spots in the basal region of the dorsal fin. However, various specimens with this characteristic appeared in the region after the construction of the Itaipu Hydroelectric Plant in 1982. An analysis of the genetic variability of Steindachnerina populations with or without spots is provided. Specimens were collected in different sites of the floodplain of the upper Paraná river and samples were compared by random amplified polymorphic DNA (RAPD) technique and morphological analyses. Ninety-eight amplified loci with nine random primers were analysed in 19 specimens of each phenotype. Data for genetic distance showed great divergences between the two phenotypes and indicate two different species. Spotted specimens may be identified as S. brevipinna, found in the region downstream Sete Quedas Falls. The species must have overcome the geographical barrier during the building of the Itaipu hydroelectric dam that submerged the waterfalls and which became an obstacle between the upper and middle Paraná river some 150 km downstream. Since phenotypes do not share dominant alleles, absence of gene flow has been suggested.

  12. Patterns of food resource use by two congeneric species of piranhas (Serrasalmus) on the Upper Paraná River floodplain.

    Science.gov (United States)

    Agostinho, C S; Hahn, N S; Marques, E E

    2003-05-01

    Serrasalmus marginatus invaded the Upper Paraná River after construction of the Itaipu Dam in November 1982. This was followed by a reduction in abundance of the native species S. spilopleura. Analysis of the pattern of food resource use revealed that both species employ the same feeding strategy, eating mainly fish (whole fish or muscle fragments) and fins bitten off their prey. The diurnal activity period and the feeding rhythm were better-defined in S. marginatus. For young individuals of both species, food was taken in a significantly discontinuous manner (F = 2.83; p < 0.05 and F = 13.25; p < 0.05), with a peak at 4 p.m. Ontogenetic differences in diet, the strong feeding overlap of larger individuals of S. marginatus and smaller individuals of S. spilopleura, and the aggressiveness of S. marginatus in establishing feeding territories may have contributed to the success of the invading species.

  13. Patterns of food resource use by two congeneric species of piranhas (Serrasalmus on the upper Paraná river floodplain

    Directory of Open Access Journals (Sweden)

    C. S. Agostinho

    Full Text Available Serrasalmus marginatus invaded the Upper Paraná River after construction of the Itaipu Dam in November 1982. This was followed by a reduction in abundance of the native species S. spilopleura. Analysis of the pattern of food resource use revealed that both species employ the same feeding strategy, eating mainly fish (whole fish or muscle fragments and fins bitten off their prey. The diurnal activity period and the feeding rhythm were better-defined in S. marginatus. For young individuals of both species, food was taken in a significantly discontinuous manner (F = 2.83; p < 0.05 and F = 13.25; p < 0.05, with a peak at 4 p.m. Ontogenetic differences in diet, the strong feeding overlap of larger individuals of S. marginatus and smaller individuals of S. spilopleura, and the aggressiveness of S. marginatus in establishing feeding territories may have contributed to the success of the invading species.

  14. Patterns of food resource use by two congeneric species of piranhas (Serrasalmus on the upper Paraná river floodplain

    Directory of Open Access Journals (Sweden)

    Agostinho C. S.

    2003-01-01

    Full Text Available Serrasalmus marginatus invaded the Upper Paraná River after construction of the Itaipu Dam in November 1982. This was followed by a reduction in abundance of the native species S. spilopleura. Analysis of the pattern of food resource use revealed that both species employ the same feeding strategy, eating mainly fish (whole fish or muscle fragments and fins bitten off their prey. The diurnal activity period and the feeding rhythm were better-defined in S. marginatus. For young individuals of both species, food was taken in a significantly discontinuous manner (F = 2.83; p < 0.05 and F = 13.25; p < 0.05, with a peak at 4 p.m. Ontogenetic differences in diet, the strong feeding overlap of larger individuals of S. marginatus and smaller individuals of S. spilopleura, and the aggressiveness of S. marginatus in establishing feeding territories may have contributed to the success of the invading species.

  15. Great horned owl (Bubo virginianus) dietary exposure to PCDD/DF in the Tittabawassee River floodplain in Midland, Michigan, USA.

    Science.gov (United States)

    Coefield, Sarah J; Zwiernik, Matthew J; Fredricks, Timothy B; Seston, Rita M; Nadeau, Michael W; Tazelaar, Dustin L; Moore, Jeremy N; Kay, Denise P; Roark, Shaun A; Giesy, John P

    2010-10-01

    Soils and sediments in the floodplain of the Tittabawassee River downstream of Midland, Michigan, USA contain elevated concentrations of polychlorinated dibenzofurans (PCDF) and polychlorinated dibenzo-p-dioxins (PCDD). As a long-lived, resident top predator, the great horned owl (Bubo virginianus; GHO) has the potential to be exposed to bioaccumulative compounds such as PCDD/DF. Site-specific components of the GHO diet were collected along 115 km of the Tittabawassee, Pine, Chippewa, and Saginaw Rivers during 2005 and 2006. The site-specific GHO biomass-based diet was dominated by cottontail rabbits (Sylvilagus floridanus) and muskrats (Ondatra zibethicus). Incidental soil ingestion and cottontail rabbits were the primary contributors of PCDD/DF to the GHO diet. The great horned owl daily dietary exposure estimates were greater in the study area (SA) (3.3 to 5.0 ng 2,3,7,8-TCDD equivalents (TEQ(WHO-avian))/kg body wt/d) than the reference area (RA) (0.07 ng TEQ(WHO-Avian)/kg body wt/d). Hazard quotients (HQs) based on central tendency estimates of the average daily dose and no-observable-adverse effect level (NOAEL) for the screech owl and uncertainty factors were <1.0 for both the RA and the SA. Hazard quotients based on upper end estimates of the average daily dose and NOAEL were <1.0 in the RA and up to 3.4 in the SA. Environ. Toxicol. Chem. 2010;29:2350-2362. © 2010 SETAC.

  16. Geomorphic and hydrologic assessment of erosion hazards at the Norman municipal landfill, Canadian River floodplain, Central Oklahoma

    Science.gov (United States)

    Curtis, J.A.; Whitney, J.W.

    2003-01-01

    The Norman, Oklahoma, municipal landfill closed in 1985 after 63 years of operation, because it was identified as a point source of hazardous leachate composed of organic and inorganic compounds. The landfill is located on the floodplain of the Canadian River, a sand-bed river characterized by erodible channel boundaries and by large variation in mean monthly discharges. In 1986, floodwaters eroded riprap protection at the southern end of the landfill and penetrated the landfill's clay cap, thereby exposing the landfill contents. The impact of this moderate-magnitude flood event (Q12) was the catalyst to investigate erosion hazards at the Norman landfill. This geomorphic investigation analyzed floodplain geomorphology and historical channel changes, flood-frequency distributions, an erosion threshold, the geomorphic effectiveness of discharge events, and other factors that influence erosion hazards at the landfill site. The erosion hazard at the Norman landfill is a function of the location of the landfill with respect to the channel thalweg, erosional resistance of the channel margins, magnitude and duration of discrete discharge events, channel form and hydraulic geometry, and cumulative effects related to a series of discharge events. Based on current climatic conditions and historical channel changes, a minimum erosion threshold is set at bankfull discharge (Q = 572 m3/s). The annual probability of exceeding this threshold is 0.53. In addition, this analysis indicates that peak stream power is less informative than total energy expenditures when estimating the erosion potential or geomorphic effectiveness of discrete discharge events. On the Canadian River, long-duration, moderate-magnitude floods can have larger total energy expenditures than shorter-duration, high-magnitude floods and therefore represent the most serious erosion hazard to floodplain structures.

  17. Study of heavy metal contamination in river floodplains using the red-edge position in spectroscopic data

    NARCIS (Netherlands)

    Clevers, J.G.P.W.; Kooistra, L.; Salas, E.A.L.

    2004-01-01

    One of the major environmental problems resulting from the regular flooding of rivers in Europe is the heavy metal contamination of soils. Various studies have shown that soil contamination may influence plant physiology and, through changes in leaf pigment concentrations, influence reflectance

  18. In situ fossil seedlings of a Metasequoia-like taxodiaceous conifer from Paleocene river floodplain deposits of central Alberta, Canada.

    Science.gov (United States)

    Falder, A B; Stockey, R A; Rothwell, G W

    1999-06-01

    Fossil seeds and seedlings of a Metasequoia-like taxodiaceous conifer occur in Paleocene deposits at the Munce's Hill and Gao Mine localities of central Alberta, Canada. Compression/impression specimens are preserved in upright growth positions among seedlings of the cercidiphyllaceous dicot Joffrea speirsii Crane & Stockey. There are a large number of seeds, a few of which were buried while germinating and show a radicle or short primary root. More than 500 Metasequoia-like seedlings have been identified that have two linear cotyledons with parallel margins and rounded tips. Three specimens have been found that display three cotyledons. Slightly older seedlings show decussate pairs of leaves attached to the stem distal to the cotyledons. Still older seedlings have axillary branches that show varying sizes and numbers of opposite leaves arranged in a single plane distal to the opposite pairs. These specimens reveal that both Joffrea and this extinct taxodiaceous conifer were early colonizers of North American floodplain communities at the beginning of the Tertiary.

  19. Environmental education in the Upper Paraná River floodplain, municipality of Porto Rico (Paraná State, Brazil

    Directory of Open Access Journals (Sweden)

    AT. Obara

    Full Text Available Since 2003, researchers, faculty, graduate and undergraduate students from the State University of Maringá have been working alongside teachers from the state and local schools in the municipality of Porto Rico (Paraná State, located on the banks of the Paraná River. Their objective is to outline actions and strategies with the purpose of building methodological paths to insert environmental education into the school curriculum. Based on the action-research methodology, the group has developed the following programs: a the Continuing Education Program in Environmental Education; b the Development of Interdisciplinary Projects; c the Insertion of Information and Communication Technologies (ICTs; and d the Production of Teaching Materials. The evaluations of the programs indicate that teachers have been able to gradually build a theoretical and methodological basis for environmental education while simultaneously growing into the role of teacher-researchers as they create the conditions to investigate their pedagogical practices, reflect upon them, share experiences, innovate, and make the teaching-learning process more significant. Allied to the advances in educational practices and with the aid of ICTs, the activities developed in the classroom, in the field and in the lab - all of which involve natural and cultural aspects of the region - have contributed to teachers' and students' better understanding of the ecological, cultural, social and economic value of the floodplain, and consequently, of the importance of preservation and management in order to maintain local biodiversity.

  20. Nematode-based risk assessment of mixture toxicity in a moderately polluted river floodplain in The Netherlands

    NARCIS (Netherlands)

    Vliet, van P.C.J.; Goede, de R.G.M.

    2008-01-01

    Heavy metal polluted soils usually contain mixtures of different metals, whereas legislation is derived from concentrations of individual metals. The mixture toxicity of the Dutch floodplain Afferdensche and Deestsche Waarden was estimated to be high (msPAF ranged from 67¿94%). Analyses of nematode

  1. Validity and sensitivity of a model for assessment of impacts of river floodplain reconstruction on protected and endangered species

    International Nuclear Information System (INIS)

    Nooij, R.J.W. de; Lotterman, K.M.; Sande, P.H.J. van de; Pelsma, T.; Leuven, R.S.E.W.; Lenders, H.J.R.

    2006-01-01

    Environmental Impact Assessment (EIA) must account for legally protected and endangered species. Uncertainties relating to the validity and sensitivity of EIA arise from predictions and valuation of effects on these species. This paper presents a validity and sensitivity analysis of a model (BIO-SAFE) for assessment of impacts of land use changes and physical reconstruction measures on legally protected and endangered river species. The assessment is based on links between species (higher plants, birds, mammals, reptiles and amphibians, butterflies and dragon- and damselflies) and ecotopes (landscape ecological units, e.g., river dune, soft wood alluvial forests), and on value assignment to protected and endangered species using different valuation criteria (i.e., EU Habitats and Birds directive, Conventions of Bern and Bonn and Red Lists). The validity of BIO-SAFE has been tested by comparing predicted effects of landscape changes on the diversity of protected and endangered species with observed changes in biodiversity in five reconstructed floodplains. The sensitivity of BIO-SAFE to value assignment has been analysed using data of a Strategic Environmental Assessment concerning the Spatial Planning Key Decision for reconstruction of the Dutch floodplains of the river Rhine, aimed at flood defence and ecological rehabilitation. The weights given to the valuation criteria for protected and endangered species were varied and the effects on ranking of alternatives were quantified. A statistically significant correlation (p < 0.01) between predicted and observed values for protected and endangered species was found. The sensitivity of the model to value assignment proved to be low. Comparison of five realistic valuation options showed that different rankings of scenarios predominantly occur when valuation criteria are left out of the assessment. Based on these results we conclude that linking species to ecotopes can be used for adequate impact assessments. Quantification of sensitivity of impact assessment to value assignment shows that a model like BIO-SAFE is relatively insensitive to assignment of values to different policy and legislation based criteria. Arbitrariness of the value assignment therefore has a very limited effect on assessment outcomes. However, the decision to include valuation criteria or not is very important

  2. Soil properties and growth of swamp white oak and pin oak on bedded soils in the lower Missouri River floodplain

    Science.gov (United States)

    John M. Kabrick; Daniel C. Dey; J. W. Van Sambeek; Michael Wallendorf; Michael A. Gold

    2005-01-01

    Restoring bottomland hardwood ecosystems is of great interest along the lower Missouri River and within the Mississippi Alluvial Valley. However, bottomland hardwood plantings commonly have a high failure rate. Among reasons cited for failures are frequent flooding and poorly drained site conditions. Soil bedding is a commonly used site preparation method shown to...

  3. Agriculture and the promotion of insect pests: rice cultivation in river floodplains and malaria vectors in The Gambia

    Directory of Open Access Journals (Sweden)

    Louca Vasilis

    2009-07-01

    Full Text Available Abstract Background Anthropogenic modification of natural habitats can create conditions in which pest species associated with humans can thrive. In order to mitigate for these changes, it is necessary to determine which aspects of human management are associated with the promotion of those pests. Anopheles gambiae, the main Africa malaria vector, often breeds in rice fields. Here the impact of the ancient practice of 'swamp rice' cultivation, on the floodplains of the Gambia River, on the production of anopheline mosquitoes was investigated. Methods Routine surveys were carried out along 500 m transects crossing rice fields from the landward edge of the floodplains to the river during the 2006 rainy season. Aquatic invertebrates were sampled using area samplers and emergence traps and fish sampled using nets. Semi-field experiments were used to investigate whether nutrients used for swamp rice cultivation affected mosquito larval abundance. Results At the beginning of the rainy season rice is grown on the landward edge of the floodplain; the first area to flood with fresh water and one rich in cattle dung. Later, rice plants are transplanted close to the river, the last area to dry out on the floodplain. Nearly all larval and adult stages of malaria vectors were collected 0–100 m from the landward edge of the floodplains, where immature rice plants were grown. These paddies contained stagnant freshwater with high quantities of cattle faeces. Semi-field studies demonstrated that cattle faeces nearly doubled the number of anopheline larvae compared with untreated water. Conclusion Swamp rice cultivation creates ideal breeding sites for malaria vectors. However, only those close to the landward edge harboured vectors. These sites were productive since they were large areas of standing freshwater, rich in nutrients, protected from fish, and situated close to human habitation, where egg-laying mosquitoes from the villages had short distances to fly. The traditional practice of 'swamp rice' cultivation uses different bodies of water on the floodplains to cultivate rice during the rainy season. A consequence of this cultivation is the provizion of ideal conditions for malaria vectors to thrive. As the demand for locally-produced rice grows, increased rice farming will generate great numbers of vectors; emphasizing the need to protect local communities against malaria.

  4. The role of vegetated areas on fish assemblage of the Paraná River floodplain: effects of different hydrological conditions

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    Juan José Neiff

    Full Text Available In this paper, we analyze the changes in composition and abundance of fish assemblages in seven vegetated floodplain wetlands with different connectivity across different hydrologic conditions: after a prolonged connection of the floodplain with the main channel, during receding water, and after a prolonged isolation. We also investigated the size and abundance of large-sized migratory species found in these wetlands and the food resources exploited by the dominant fish. Fishes were captured by diurnal seining (8.0 m x 1.50 m, 5 mm mesh along macrophyte banks. Despite the high total number of species registered (100, sample species richness varied between 7 and 31, depending on the sampling site and the sampling date. Cluster analysis indicated low similarity between sites during both the isolation and the prolonged connection. Species turnover decreased from high water (β = 40.33 to low water (β = 33.83, with the minimum value of beta diversity index obtained during the isolation of the floodplain wetlands (β = 26.83. Our results indicated that different dominant populations of fish occur in different hydrological conditions, even though high water and isolation phases occur in the same season of different years. The ordination (NMDS indicated the importance of hydrologic conditions in structuring fish assemblages in the studied floodplain. Small-sized characids, typically associated with macrophytes, dominated the fish assemblages, whereas the younger stages of large sized migratory species were found in low abundance. The maximum standard length of the fish captured was 28 cm and for large migratory fish, standard length varied between 1.6 and 25.0 cm. The dominant fish used several food resources, but littoral macrophytes-associated organisms had a high frequency of occurrence in the three hydrologic conditions. The high species richness of fish in the small, vegetated lakes was related to the high spatial heterogeneity during different hydrological conditions. Disturbances in the hydrological pulses could reduce the biodiversity by modifying the connectivity of the floodplain with the river channel. Conservation of these vegetated wetlands requires maintenance of actual width range of connectivity that provide diverse habitat along the time.

  5. Analysis of the development of land use in the Morava River floodplain, with special emphasis on the landscape matrix

    Czech Academy of Sciences Publication Activity Database

    Kilianová, H.; Pechanec, V.; Brus, J.; Kirchner, Karel; Machar, I.

    2017-01-01

    Roč. 25, č. 1 (2017), s. 35-48 ISSN 1210-8812 Institutional support: RVO:68145535 Keywords : historical maps * land use changes * floodplain * Morava River * Czech Republic Subject RIV: DE - Earth Magnetism, Geodesy, Geography OBOR OECD: Physical geography Impact factor: 2.149, year: 2016 http://www.geonika.cz/mgr.html#articles

  6. Refurbishment of the technical water system, Task 3.08/04-09; Podzadatak 3.08/04-09 Remont sistema tehnicke vode

    Energy Technology Data Exchange (ETDEWEB)

    Nikolic, M; Milic, J [Institute of Nuclear Sciences Boris Kidric, Reaktor RA, Vinca, Beograd (Serbia and Montenegro)

    1963-12-15

    This report deals with repair and maintenance of the secondary coolant loop (technical water system) of the RA reactor. The need of proper functionality of the coolant system demanded inspection of the centrifugal pumps on Danube, cleaning of the pools for removal of sludge from the technical water; cleaning of the main heat exchangers and heavy water heat exchangers and inspection of all the parts of the cooling system situated in the reactor building.

  7. Reconstruction of the Late Holocene river channel shifts in the North-Eastern part of the Lower Danube Plain based on historical data

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    Ionuț-Alexandru CRISTEA

    2014-11-01

    Full Text Available Several periods of increased fluvial activity and accelerated runoff / deposition have been identified during the Holocene in different regions of Europe (Macklin et al, 2006. According to Starkel (2002 the older phases were characterized by an incision of deeper and wider tracks and, since Roman period, especially during the past millennium, tendency had changed to aggradation, braiding and river avulsions. The turn to a more stable fluvial regime caused further incisions and the development of narrow and smaller meanders. All these fluvial responses can be mainly correlated with the climatic fluctuations (cooler and wetter phases alternating with drier and warmer ones, socio-economic changes (increased anthropic pressure or both. The last major period of concentration of extreme meteorological and hydrological events is the Little Ice Age (LIA, which conventionally took place between the 16th and mid 19th century (Lamb, 1984. However in Romania the study of LIA and the associate fluvial effects is rather poor. The data regarding hydro-climatological events (weather conditions, floods in the medieval period (mostly collected by Topor, 1960 is scarce and based on the few local chronicles and diaries of the foreign travelers. However these confirm the increased frequency and magnitude of the rainfalls in the summer (with several important peaks in the 1590 – 1690 interval as well as the hard winters well documented for the rest of the continent. Changes in the configuration of the stream network, due to avulsions, can be evaluated based on historical maps only with the first half of the 17th century and the dating of the fluvial records is still missing.The North-Eastern part of the Lower Danube Plain (Fig. 1 is a large alluvial floodplain where Siret River collects several major tributary streams draining SE Carpathians (Putna, Râmnicu Sărat, Buzău or the Moldavian Tableland (Bârlad, before joining Danube, near Galaţi. Surprisingly Siret

  8. A 320-year long series of Danube floods in Central Hungary (Budapest and Pest County): a frequency-magnitude-seasonality overview

    Science.gov (United States)

    Kiss, Andrea; Salinas, Jose; Bloeschl, Guenter

    2015-04-01

    The present paper is based on a recently developed database including contemporary original, administrative, legal and private source materials (published and archival) as well as media reports related to the floods occurred in the town of Budapest (historical towns of Pest, Buda) and Central Hungary (historical Pest-Pilis-Solt County). As for the archival evidence, main bases of investigation are the administrative sources such as town council protocols and county meeting protocols of Budapest and historical Pest-Pilis-Solt County: in these (legal-)administrative documents damaging events (natural/environmental hazards) were systematically recorded. Moreover, other source types such as taxation-related damage accounts as well as private and official reports, letters and correspondence (published, unpublished) were also included. Concerning published evidence, a most important source is flood reports in contemporary newspapers; however, other published sources (e.g. narratives, fund raising circulars etc.; both published and unpublished) also contained useful flood-related information. Beyond providing information on the strength and weaknesses of different sources types and the temporal and spatial distribution of evidence, a general background on the contemporary environmental and hydrological/hydromorphological conditions of the study area (and its changes during and after river regulations) are also provided. However, in the presentation the main focus is on the analysis of flood rich flood poor periods of the last more than 300 years; furthermore, the seasonality distribution as well as the magnitude of Danube flood events - and their spatial differences are discussed. In case of Budapest and Central Hungary, with respect to the greatest flood events, ice jam floods played a rather significant role before river regulation works. Due to this fact the main types of flood events (including their main causes), with special emphasis on ice jam floods, are discussed

  9. Geostatistical screening of flood events in the groundwater levels of the diverted inner delta of the Danube River: implications for river bed clogging

    Science.gov (United States)

    Trásy, Balázs; Garamhegyi, Tamás; Laczkó-Dobos, Péter; Kovács, József; Hatvani, István Gábor

    2018-04-01

    The efficient operation of shallow groundwater (SGW) monitoring networks is crucial to water supply, in-land water protection, agriculture and nature conservation. In the present study, the spatial representativity of such a monitoring network in an area that has been thoroughly impacted by anthropogenic activity (river diversion/damming) is assessed, namely the Szigetköz adjacent to the River Danube. The main aims were to assess the spatial representativity of the SGW monitoring network in different discharge scenarios, and investigate the directional characteristics of this representativity, i.e. establish whether geostatistical anisotropy is present, and investigate how this changes with flooding. After the subtraction of a spatial trend from the time series of 85 shallow groundwater monitoring wells tracking flood events from 2006, 2009 and 2013, variogr