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Sample records for west basin south

  1. South American sedimentary basins

    Energy Technology Data Exchange (ETDEWEB)

    Urien, C.M.

    1984-04-01

    More than 64 sedimentary basins have been identified on the South American continent. According to their regional structural character and tectonic setting, they are classified in 4 super groups. About 20 interior or intracratonic basins occur on South American cratons (Guayanas, Brazilian, and Patagonian). In most cases, their sedimentary fill is Paleozoic or early Mesozoic. Rift or transverse grabens resulting from incipient sea floor spreading extend towards the continental margin. Seventeen basins are located along the Atlantic stable margin, and consist primarily of half grabens with downfaulted seaward blocks. These rifts (or pull-apart basins) were separated as results of the migration of the African and American continental blocks. Therefore the sedimentation is chiefly Cretaceous and Tertiary. On the western edge of South American cratons, almost 20 basins of downwarped blocks extend from Orinoco down to the Malvinas plateau in a relatively uninterrupted chain of retroarc basins, bordered by the Andean orogen. They lie on a flexured Precambrian and Paleozoic basement, and are highly deformed in the west (Subandean belt) due to the action of compressional forces caused by the tectonic influence of the Mesozoic Andean batholith. Westward, the Pacific margin is bordered by 27 foreland and forearc basins, which alternate from north to south on an unstable or quasistable margin, fringed by a trench and slope complex where the ocean crust is subducted beneath the continental plate.

  2. Groundwater nitrate pollution in Souss-Massa basin (south-west ...

    African Journals Online (AJOL)

    The objective of our study was to determine the current status of alluvial aquifer in the Souss-Massa basin, where the nitrate pollution of groundwater is being increasing along the last decades. A multiapproach methodology using hydrogeology, nitrate concentrations, irrigation type and oxygen-18 and deuterium data, was ...

  3. Groundwater nitrate pollution in Souss-Massa basin (south-west ...

    African Journals Online (AJOL)

    EJIRO

    The objective of our study was to determine the current status of alluvial aquifer in the Souss-Massa basin, where the nitrate pollution of groundwater is being increasing along the last decades. A multi- approach methodology using hydrogeology, nitrate concentrations, irrigation type and oxygen-18 and deuterium data, was ...

  4. Devonian sand injections and volcanism in the Murzuq Basin (south-west Libya)

    DEFF Research Database (Denmark)

    Moreau, Julien; Ghienne, Jean-Francois

    The highly prolific Murzuq basin in SW Libya was considered devoid of large sand injection system and volcanic activity during the Lower Palaeozoic. This study identified numerous evidences of kilometre-scale sand injections in association with volcanism of Lower Devonian age. The sand injection...

  5. Hydrocarbon source potential of the Tanezzuft Formation, Murzuq Basin, south-west Libya: An organic geochemical approach

    Science.gov (United States)

    El Diasty, W. Sh.; El Beialy, S. Y.; Anwari, T. A.; Batten, D. J.

    2017-06-01

    A detailed organic geochemical study of 20 core and cuttings samples collected from the Silurian Tanezzuft Formation, Murzuq Basin, in the south-western part of Libya has demonstrated the advantages of pyrolysis geochemical methods for evaluating the source-rock potential of this geological unit. Rock-Eval pyrolysis results indicate a wide variation in source richness and quality. The basal Hot Shale samples proved to contain abundant immature to early mature kerogen type II/III (oil-gas prone) that had been deposited in a marine environment under terrigenous influence, implying good to excellent source rocks. Strata above the Hot Shale yielded a mixture of terrigenous and marine type III/II kerogen (gas-oil prone) at the same maturity level as the Hot Shale, indicating the presence of only poor to fair source rocks.

  6. Geometric and kinematics of West Segment of South Dabashan Foreland Fold-and-Thrust Belt, Northeast Sichuan Basin, China

    Science.gov (United States)

    He, Dengfa

    2017-04-01

    The west segment of South Daba Shan (WSD) foreland thrust belt is an ideal area to disclose the intra-continental tectonic processes. Based on the latest pre-stack depth migration of 3-D seismic data, 2-D seismic profile, well data and geological outcrop, the paper explore the structural geometric and kinematic features of WSD with the application of fault-related folding theories. WSD is characterized by multi-level detachment deformation due to the three predominant sets of weak layers, Lower Triassic Jialingjiang Formation gypsum interval, Silurian mudstone beds and Cambrian shale zone. It is accordingly subdivided vertically into three tectonic systems. The upper one is above the Jialingjiang Formation gypsolith layer and presents a Jura-like fold-and-thrust belt. The middle one takes Silurian shale as the base and Jialingjiang Formation gypsolith interval as the passive roof, in which imbricate thrusts developed. The lower one is bounded to Cambrian and Silurian detachment layers, in which duplex dominated. The Sinian and Proterozoic basements below Cambrian have not been involved in deformation. WSD underwent four periods of tectonic evolution: Late Jurassic -Cretaceous (150-110Ma); Late Cretaceous (110-70Ma); Latest Cretaceous to Paleogene (70-30Ma); Oligocene to Quaternary (30-0 Ma). The deformation propagated southward as an imbricate style, which results in the passive uplifting of overlying structural layer. WSD exhibits a rather low taper tectonic wedge. According to the magnetotelluric and deep seismic profiles, it is inferred that the WSD tectonic processes is mainly controlled by the Yangtze continental block subduction northward under the Qingling Mountains and the pro-wedge multi-level thrusting during late Jurassic to Cretaceous. The Upper Paleozoic carbonates in the middle tectonic deformation system are favorable for gas exploration in thea area.

  7. Kilometre-scale sand injectites in the intracratonic Murzuq Basin (South-west Libya): an igneous trigger?

    DEFF Research Database (Denmark)

    Moreau, Julien; Ghienne, Jean-Francois; Hurst, Andrew

    2012-01-01

    Mount Telout, situated at the edge of the Murzuq Basin, is a 325 m high conical hill within a circular collapse structure that records 0.5 km3 of sand intrusion into Silurian shales. Based on a comparison with other similar circular collapse structures around the Murzuq Basin, it is argued that s...

  8. A Reconnaissance for Emerging Contaminants in the South Branch Potomac River, Cacapon River, and Williams River Basins, West Virginia, April-October 2004

    Science.gov (United States)

    Chambers, Douglas B.; Leiker, Thomas J.

    2006-01-01

    In 2003 a team of scientists from West Virginia Division of Natural Resources and the U. S. Geological Survey found a high incidence of an intersex condition, oocytes in the testes, among smallmouth bass (Micropterus dolomieu) in the South Branch Potomac River and the Cacapon River of West Virginia, indicating the possible presence of endocrine-disrupting compounds (EDCs). Possible sources of EDCs include municipal and domestic wastewater, and agricultural and industrial activities. Several sampling strategies were used to identify emerging contaminants, including potential EDCs, and their possible sources in these river basins and at an out-of-basin reference site. Passive water-sampling devices, which accumulate in-stream organic chemical compounds, were deployed for 40-41 days at 8 sampling sites. Sampler extracts were analyzed for a broad range of polar and non-polar organic compounds including pesticides, flame retardants, pharmaceuticals, and personal-care products. Analysis of passive-sampler extracts found 4 compounds; hexachloro-benzene; pentachloroanisole; 2,2',4,4',5-penta-bromo-diphenyl ether (BDE 47); and 2,2',4,4',6-penta-bromo-diphenyl ether (BDE 99) to be present at every sampled site, including the reference site, and several sites had detectable quantities of other compounds. No detectable quantity of any antibiotics was found in any passive-sampler extract. Effluent samples were analyzed for 39 antibiotics as tracers of human and agricultural waste. Additionally, poultry-processing plant effluent was sampled for roxarsone, an organoarsenic compound used as a poultry-feed additive, and other arsenic species as tracers of poultry waste. Antibiotics were detected in municipal wastewater, aquaculture, and poultry-processing effluent, with the highest number of antibiotics and the greatest concentrations found in municipal effluent. Arsenate was the only arsenic species detected in the poultry-processing plant effluent, at a concentration of 1.0 ?g

  9. Tectono-stratigraphic evolution of the northern margin of the Amu Darya basin in Uzbekistan (Bukhara-Khiva and South-West Gissar regions)

    Science.gov (United States)

    Mordvintsev, Dmitriy; Brunet, Marie-Françoise; Barrier, Eric; Auxiètre, Jean-Luc; Blanpied, Christian; Munsch, Hermann; Sidorova, Irina

    2014-05-01

    The main purpose of this work is the reconstruction of the geological, tectonic and stratigraphic evolution of the northern margin of the Amu Darya basin in Uzbekistan, especially during the Mesozoic time. The area considered is running from the Bukhara-Khiva region in the North-West (studied by subsurface data) to the mountains of South-Western Gissar in the South-East. To reach this objective we aim at studying and comparing these areas. The Bukhara-Khiva area consists of two NW-elongated steps - Bukhara and Chardzhou, divided by a main fault-flexural zone, called Uchbash-Karshi flexure-fault zone. Eight geological-geophysical sections have been reconstructed in the Bukhara-Khiva area by using seismic, well and map data. Six of them, roughly N-S trending, are almost perpendicular to the trend of the steps, while the two others, running along the Bukhara and Chardzhou steps are NW-oriented. All of these sections show the lateral distributions, thickness variations and unconformities between the main stratigraphic horizons. These horizons are the tops of: 1. the pre-Jurassic formations (Paleozoic - Permo-Triassic), 2. the Lower-Middle Jurassic clastics, 3. the Middle-Upper Jurassic carbonates, 4. the Upper Jurassic evaporites, 5. the Lower Cretaceous and 6. the Upper Cretaceous beds. The Bukhara step constitutes the northern part of the area. It is characterized by very thin Jurassic deposits (sometimes missing as the evaporites) no more than 300 m thick. The distribution of the different Jurassic formations is intermitted; the most extended one is the carbonate layer. Most of the Jurassic sediments are concentrated in the Chardzhou step, the southern part of the investigated area, where their thickness reaches more than 2 km. All formations are well-developed and rather thick in comparison with the Bukhara step. The Jurassic beds display different morphological-structural features. In the Bukhara step most of the surfaces exhibit a very rough relief with abundant

  10. Hydrocarbon habitat of the west Netherlands basin

    Energy Technology Data Exchange (ETDEWEB)

    De Jager, J. (Nederlandse Aardolie Maatschappij, Assen (Netherlands)); Doyle, M. (Petroleum Development Oman, Muscat (Oman)); Grantham, P. (KSEPL/Shell Research, Rijswijk (Netherlands)); Mabillard, J. (Shell Nigeria, Port Harcourt (Nigeria))

    1993-09-01

    The complex West Netherlands Basin contains oil and gas in Triassic and Upper Jurassic to Cretaceous clastic reservoir sequences. The understanding has always been that the Carboniferous coal measures have generated only gas and the Jurassic marine Posidonia Shale only oil. However, detailed geochemical analyses show that both source rocks have generated oil and gas. Geochemical fingerprinting established a correlation of the hydrocarbons with the main source rocks. The occurrence of these different hydrocarbons is consistent with migration routes. Map-based charge modeling shows that the main phase of hydrocarbon generation occurred prior to the Late Cretaceous inversion of the West Netherlands Basin. However, along the southwest flank of the basin and in lows between the inversion highs, significant charge continued during the Tertiary. Biodegradation of oils in Jurassic and Cretaceous reservoirs occurred during the earliest Tertiary, but only in reservoirs that were at that time at temperatures of less then 70 to 80[degrees]C, where bacteria could survive. This study shows that also in a mature hydrocarbon province an integrated hydrocarbon habitat study with modern analyses and state-of-the-art technology can lead to a much improved understanding of the distribution of oil and gas in the subsurface. The results of this study will allow a better risk assessment for remaining prospects, and an improved prediction of the type of trapped hydrocarbons in terms of gas, oil, and biodegraded oil.

  11. Analysis of K west basin canister gas

    Energy Technology Data Exchange (ETDEWEB)

    Trimble, D.J., Fluor Daniel Hanford

    1997-03-06

    Gas and Liquid samples have been collected from a selection of the approximately 3,820 spent fuel storage canisters in the K West Basin. The samples were taken to characterize the contents of the gas and water in the canisters providing source term information for two subprojects of the Spent Nuclear Fuel Project (SNFP) (Fulton 1994): the K Basins Integrated Water Treatment System Subproject (Ball 1996) and the K Basins Fuel Retrieval System Subproject (Waymire 1996). The barrels of ten canisters were sampled for gas and liquid in 1995, and 50 canisters were sampled in a second campaign in 1996. The analysis results from the first campaign have been reported (Trimble 1995a, 1995b, 1996a, 1996b). The analysis results from the second campaign liquid samples have been documented (Trimble and Welsh 1997; Trimble 1997). This report documents the results for the gas samples from the second campaign and evaluates all gas data in terms of expected releases when opening the canisters for SNFP activities. The fuel storage canisters consist of two closed and sealed barrels, each with a gas trap. The barrels are attached at a trunion to make a canister, but are otherwise independent (Figure 1). Each barrel contains up to seven N Reactor fuel element assemblies. A gas space of nitrogen was established in the top 2.2 to 2.5 inches (5.6 to 6.4 cm) of each barrel. Many of the fuel elements were damaged allowing the metallic uranium fuel to be corroded by the canister water. The corrosion releases fission products and generates hydrogen gas. The released gas mixes with the gas-space gas and excess gas passes through the gas trap into the basin water. The canister design does not allow canister water to be exchanged with basin water.

  12. Namibia [South-West Africa].

    Science.gov (United States)

    1983-01-01

    Namibia, a country of 1,051,700 inhabitants of whom 85.6% are blacks of diverse ethnic and linguistic origins, 7.5% are white, and the rest are of mixed ancestry, has been illegally administered by South Africa since 1966, when a League of Nations mandate was revoked by the UN. The Namibian Desert was a barrier to European expansion until the late 18th century, when the area came under German and British influence. Efforts to bring about an orderly and peaceful transition to independent status are hampered at present by the lack of parallel progress toward withdrawal of Cuban combat forces from Angola. Beginning in 1980, considerable executive power was transferred from the administrator general appointed by the South African Government to an interim 3-tier system of elected representatives dividing responsibility between central, ethnic, and local authorities. The judicial structure has separate overlapping systems for whites, westernized blacks and coloreds and for indigenous blacks. Namibian society is highly politicized, with 4 white and about 40 nonwhite political groups. The South West Africa People's Organization (SWAPO) remains an active party inside Namibia despite simultaneous detention of its entire leadership in 1979 by the South African Government. Namibia's economy is dual, with a modern market sector of mining, ranching and fishing producing most of the wealth and a traditional subsistence sector supporting most of the labor force. About 60% of the work force of 500,000 in 1981 worked in agriculture, 19% in industry and commerce, 6% in mining, 8% in services, and 7% in government. Namibia's gross domestic product in 1980 was $1.712 billion, representing an average growth rate of 2.5% from 1970-80. However, real growth since 1978 has been negative because of persistent drought, political uncertainty, low demand for mineral products, and previous overfishing. Namibia has no separate representation in any international body. The country may have the

  13. IAU South West Asian ROAD

    Science.gov (United States)

    Mickaelian, Areg; Azatyan, Naira; Farmanyan, Sona; Mikayelyan, Gor

    2016-10-01

    Armenia is hosting the IAU South West Asian (SWA) Regional Office of Astronomy for Development (ROAD). It is a county of ancient astronomy and is also rich in modern astronomical facilities and infrastructures, hence may successfully serve as a regional center for various activities. Byurakan Astrophysical Observatory (BAO) has 2.6m and 1m Schmidt, as well as a number of smaller telescopes that are an observational basis for joint projects and collaborations. Armenian Virtual Observatory (ArVO) is hosting astronomical databases, such as the Digitized First Byurakan Survey (DFBS) and may also serve as a basis for development of VO structures in this region. Recently we have conducted a number of new activities; a meeting on ``Relation of Astronomy to other Sciences, Culture and Society" (RASCS) was organized by BAO and Armenian Astronomical Society (ArAS) in Oct 2014 in Byurakan. Activities related to Archaeoastronomy and Astronomy in Culture (AAC) were initiated as well. Discussions on future Armenian-Iranian collaboration in astronomy were carried out, including an Armenian-Iranian Astronomical Workshop held in Oct 2015 in Byurakan. Similar workshops have been carried out between BAO and Abastumani Astronomical Observatory (AbAO, Georgia) since 1974.

  14. Geohydrologic study of the West Lake Basin

    Energy Technology Data Exchange (ETDEWEB)

    Gephart, R.E.; Eddy, P.A.; Arnett, R.C.; Robinson, G.A.

    1976-10-01

    The purpose of this investigation was to (1) collect and interpret geochemical data on the surface, unconfined, and confined waters of the West Lake Basin, and (2) evaluate the potential for radiochemical contamination of the uppermost confined aquifers. The report assesses the suitability of Gable Mountain Pond for receiving waste water from 200 East Area operations and applies a predictive digital computer model to assess the impacts to the groundwater regime of maintaining, increasing, or decreasing water discharge into Gable Mountain Pond. East of the 200 East Area lies a natural depression which has been dammed and used as a liquid waste disposal site (B Pond). B Pond waste waters directly recharge the underlying unconfined aquifer. This report will examine the suitability of using B Pond for receiving additional waste waters which would otherwise be discharged to Gable Mountain Pond. A predictive digital computer model will be used for assessments involving various discharges into B Pond.

  15. LEISHMANIASIS IN SOUTH WEST AFRICA: PRELIMINARY NOTES ...

    African Journals Online (AJOL)

    1971-03-13

    Mar 13, 1971 ... Leishmaniasis was first reported from South West. Africa in 1970.' All 4 cases had contracted cutaneous leishmaniasis, and all 4 occurred in White women. These cases appeared over a period of 3 years. Before this the nearest recorded case of leishmaniasis was from south- western Angola.' Cahill' has ...

  16. Geochemical reconstruction of the provenance, weathering and deposition of detrital-dominated sediments in the Perth Basin: The Cretaceous Leederville Formation, south-west Australia

    Science.gov (United States)

    Descourvieres, Carlos; Douglas, Grant; Leyland, Lucy; Hartog, Niels; Prommer, Henning

    2011-05-01

    The deep (> 10 km) Permian to present day Perth Basin in southwest Western Australia is composed of sedimentary successions of continental to shallow marine origin. This study examines the compositional variation, weathering and provenance of the early Cretaceous Leederville Formation within the Perth Basin. Over 200 sediment samples were retrieved from two deep boreholes of ~ 350 to 530 m in depth encompassing the Leederville Formation, and analysed for major and trace element geochemistry and mineralogy. The Leederville Formation is composed of subarkosic sands, predominantly composed of quartz (64%) and K-feldspars (27%); silts and clays composed of kaolinite (24-54%), K-feldspars (20-29%) and quartz (18-40%), with their compositional variation reflecting weathering, hydraulic sorting during transport, mostly subaqueous deposition and subsequent diagenesis. Most trace elements are associated with fine grained lithologies due to their occurrence within clays, sulphide or zircon. Major and trace element geochemistry suggests a typical passive margin origin with minimal intrabasinal sediment recycling. The regionally extensive Yilgarn Craton, appears to be the main sediment source for the Leederville Formation within the study area.

  17. South Fork Holston River basin 1988 biomonitoring

    Energy Technology Data Exchange (ETDEWEB)

    Saylor, C.F.; Ahlstedt, S.A.

    1990-06-01

    There is concern over the effects of shifts in land use use practices on the aquatic fauna of streams in the South Fork Holston River basin in northwestern North Carolina and southwestern Virginia. Trout reproduction has noticeably declined in the Watauga River subbasin. The Watauga River and Elk River subbasins have been subjected to commercial and resort development. The Middle fork Holston River and the upper South Fork Holston River subbasins have been affected by agricultural and mining activities, respectively (Cox, 1986). To aid reclamation and management of the South Fork Holston basin, Tennessee Valley Authority (TVA) biologists conducted biomonitoring--including index of biotic integrity and macroinvertebrate sampling--on the Middle Fork Holston, South Fork Holston, Watauga, and Elk Rivers to assess cumulative impairment related to changes in habitat and pollutant loading in these subbasins. Biomonitoring can detect environmental degradation, help document problem areas, and assist in development of strategies for managing water quality. This report discusses the methods and materials and results of the biomonitoring of South Fork Holston River Basin. 13 refs., 5 figs., 12 tabs.

  18. Analysis of Ignition Testing on K-West Basin Fuel

    Energy Technology Data Exchange (ETDEWEB)

    J. Abrefah; F.H. Huang; W.M. Gerry; W.J. Gray; S.C. Marschman; T.A. Thornton

    1999-08-10

    Approximately 2100 metric tons of spent nuclear fuel (SNF) discharged from the N-Reactor have been stored underwater at the K-Basins in the 100 Area of the Hanford Site. The spent fuel has been stored in the K-East Basin since 1975 and in the K-West Basin since 1981. Some of the SNF elements in these basins have corroded because of various breaches in the Zircaloy cladding that occurred during fuel discharge operations and/or subsequent handling and storage in the basins. Consequently, radioactive material in the fuel has been released into the basin water, and water has leaked from the K-East Basin into the soil below. To protect the Columbia River, which is only 380 m from the basins, the SNF is scheduled to be removed and transported for interim dry storage in the 200 East Area, in the central portion of the Site. However, before being shipped, the corroded fuel elements will be loaded into Multi-Canister OverPacks and conditioned. The conditioning process will be selected based on the Integrated Process Strategy (IPS) (WHC 1995), which was prepared on the basis of the dry storage concept developed by the Independent Technical Assessment (ITA) team (ITA 1994).

  19. Organic Geochemistry and Rock-Eval Pyrolysis of Eocene fine Sediments, East Ketungau Basin, West Kalimantan

    Directory of Open Access Journals (Sweden)

    M.H. Hermiyanto Zajuli

    2014-06-01

    Full Text Available DOI: 10.17014/ijog.v6i2.119Indonesia contains many Paleogene and Neogene basins which some of them have been proven to be a very prolific producer of oil and gas. A study on the result of Rock-Eval pyrolysis and biomarker undertaken on the Eocene Mandai Group was able to assess hydrocarbon potential of the Paleogene fine sediments in the frontier basin, especially West Kalimantan area. East Ketungau Basin is located in the western Kalimantan, bounded with Melawi Basin by the Semitau High in the south and West Ketungau Basin in the west. The Mandai Group was deposited in the East Ketungau Basin during Eocene, consisting of sandstone and mudstone facies. Mudstone facies comprises shale, claystone, and coal. Seven samples of Eocene fine sediments collected from East Ketungau Basin were analyzed by Rock-Eval pyrolisis and three samples for biomarker to evaluate their hydrocarbon potential. The Rock-Eval pyrolisis result of Mandai Group shows that TOC value of this facies ranges from 0.34 % to 5.16 %, Potential Yield (PY between 0.06 and 4.78 mg HC/g rock, and Hydrogen Index (HI from 12 to 89. Based on that result, the fine sediments of Mandai Group are included into a gas prone source rock potential with poor to fair categories. Moreover Tmax values vary from 426o C to 451o C. The Eocene fine sediments of Mandai Group fall under kerogen type III. Based on Tmax and biomarker analyses, the maturity of the sediments is situated within immature to mature level. The fine sediments of Mandai Group were deposited in a terrestrial to marine environment under anoxic to sub-oxic condition.

  20. Oil and gas resources in the West Siberian Basin, Russia

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    1997-12-01

    The primary objective of this study is to assess the oil and gas potential of the West Siberian Basin of Russia. The study does not analyze the costs or technology necessary to achieve the estimates of the ultimate recoverable oil and gas. This study uses reservoir data to estimate recoverable oil and gas quantities which were aggregated to the field level. Field totals were summed to a basin total for discovered fields. An estimate of undiscovered oil and gas, from work of the US Geological Survey (USGS), was added to give a total basin resource volume. Recent production decline points out Russia`s need to continue development of its discovered recoverable oil and gas. Continued exploration is required to discover additional oil and gas that remains undiscovered in the basin.

  1. Terrestrial ecology in South Africa and South West Africa – project abstracts for 1979

    CSIR Research Space (South Africa)

    Ecosystems Programmes, Cooperative Scientific Programmes

    1981-05-01

    Full Text Available Brief descriptions of over 200 research projects undertaken during 1979 in South African and South West African terrestrial ecosystems are presented. The abstracts are arranged alphabetically according to author name and a keyword index is provided...

  2. SLUDGE RETRIEVAL FROM HANFORD K WEST BASIN SETTLER TANKS

    Energy Technology Data Exchange (ETDEWEB)

    ERPENBECK EG; LESHIKAR GA

    2011-01-13

    In 2010, an innovative, remotely operated retrieval system was deployed to successfully retrieve over 99.7% of the radioactive sludge from ten submerged tanks in Hanford's K-West Basin. As part of K-West Basin cleanup, the accumulated sludge needed to be removed from the 0.5 meter diameter by 5 meter long settler tanks and transferred approximately 45 meters to an underwater container for sampling and waste treatment. The abrasive, dense, non-homogeneous sludge was the product of the washing process of corroded nuclear fuel. It consists of small (less than 600 micron) particles of uranium metal, uranium oxide, and various other constituents, potentially agglomerated or cohesive after 10 years of storage. The Settler Tank Retrieval System (STRS) was developed to access, mobilize and pump out the sludge from each tank using a standardized process of retrieval head insertion, periodic high pressure water spray, retraction, and continuous pumping of the sludge. Blind operations were guided by monitoring flow rate, radiation levels in the sludge stream, and solids concentration. The technology developed and employed in the STRS can potentially be adapted to similar problematic waste tanks or pipes that must be remotely accessed to achieve mobilization and retrieval of the sludge within.

  3. Analysis of water from K west basin canisters (second campaign)

    Energy Technology Data Exchange (ETDEWEB)

    Trimble, D.J., Fluor Daniel Hanford

    1997-03-06

    Gas and liquid samples have been obtained from a selection of the approximately 3,820 spent fuel storage canisters in the K West Basin. The samples were taken to characterize the contents of the gas and water in the canisters. The data will provide source term information for two subprojects of the Spent Nuclear Fuel Project (SNFP) (Fulton 1994): the K Basins Integrated Water Treatment System subproject (Ball 1996) and the K Basins Fuel Retrieval System subproject (Waymire 1996). The barrels of ten canisters were sampled in 1995, and 50 canisters were sampled in a second campaign in 1996. The analysis results for the gas and liquid samples of the first campaign have been reported (Trimble 1995a; Trimble 1995b; Trimble 1996a; Trimble 1996b). An analysis of cesium-137 (137CS ) data from the second campaign samples was reported (Trimble and Welsh 1997), and the gas sample results are documented in Trimble 1997. This report documents the results of all analytes of liquid samples from the second campaign.

  4. Medical services in German South West Africa | Bouch | Scientia ...

    African Journals Online (AJOL)

    Scientia Militaria: South African Journal of Military Studies. Journal Home · ABOUT · Advanced Search · Current Issue · Archives · Journal Home > Vol 4, No 1 (1974) >. Log in or Register to get access to full text downloads. Username, Password, Remember me, or Register. Medical services in German South West Africa.

  5. Reserve Growth in Oil Fields of West Siberian Basin, Russia

    Science.gov (United States)

    Verma, Mahendra K.; Ulmishek, Gregory F.

    2006-01-01

    Although reserve (or field) growth has proven to be an important factor contributing to new reserves in mature petroleum basins, it is still a poorly understood phenomenon. Limited studies show that the magnitude of reserve growth is controlled by several major factors, including (1) the reserve booking and reporting requirements in each country, (2) improvements in reservoir characterization and simulation, (3) application of enhanced oil recovery techniques, and (4) the discovery of new and extensions of known pools in discovered fields. Various combinations of these factors can affect the estimates of proven reserves in particular fields and may dictate repeated estimations of reserves during a field's life. This study explores the reserve growth in the 42 largest oil fields in the West Siberian Basin, which contain about 55 percent of the basin's total oil reserves. The West Siberian Basin occupies a vast swampy plain between the Ural Mountains and the Yenisey River, and extends offshore into the Kara Sea; it is the richest petroleum province in Russia. About 600 oil and gas fields with original reserves of 144 billion barrels of oil (BBO) and more than 1,200 trillion cubic feet of gas (TCFG) have been discovered. The principal oil reserves and most of the oil fields are in the southern half of the basin, whereas the northern half contains mainly gas reserves. Sedimentary strata in the basin consist of Upper Triassic through Tertiary clastic rocks. Most oil is produced from Neocomian (Lower Cretaceous) marine to deltaic sandstone reservoirs, although substantial oil reserves are also in the marine Upper Jurassic and continental to paralic Lower to Middle Jurassic sequences. The majority of oil fields are in structural traps, which are gentle, platform-type anticlines with closures ranging from several tens of meters to as much as 150 meters (490 feet). Fields producing from stratigraphic traps are generally smaller except for the giant Talin field which

  6. A lightning climatology of the South-West Indian Ocean

    Directory of Open Access Journals (Sweden)

    C. Bovalo

    2012-08-01

    Full Text Available The World Wide Lightning Location Network (WWLLN data have been used to perform a lightning climatology in the South-West Indian Ocean (SWIO region from 2005 to 2011. Maxima of lightning activity were found in the Maritime Continent and southwest of Sri Lanka (>50 fl km−2 yr−1 but also over Madagascar and above the Great Lakes of East Africa (>10–20 fl km−2 yr−1. Lightning flashes within tropical storms and tropical cyclones represent 50 % to 100 % of the total lightning activity in some oceanic areas of the SWIO (between 10° S and 20° S.

    The SWIO is characterized by a wet season (November to April and a dry season (May to October. As one could expect, lightning activity is more intense during the wet season as the Inter Tropical Convergence Zone (ITCZ is present over all the basin. Flash density is higher over land in November–December–January with values reaching 3–4 fl km−2 yr−1 over Madagascar. During the dry season, lightning activity is quite rare between 10° S and 25° S. The Mascarene anticyclone has more influence on the SWIO resulting in shallower convection. Lightning activity is concentrated over ocean, east of South Africa and Madagascar.

    A statistical analysis has shown that El Niño–Southern Oscillation mainly modulates the lightning activity up to 56.8% in the SWIO. The Indian Ocean Dipole has a significant contribution since ~49% of the variability is explained by this forcing in some regions. The Madden–Julian Oscillation did not show significative impact on the lightning activity in our study.

  7. Neoproterozoic paleomagnetic poles in the Taoudeni basin (West Africa)

    Science.gov (United States)

    Boudzoumou, Florent; Vandamme, Didier; Affaton, Pascal; Gattacceca, Jérôme

    2011-04-01

    A palaeomagnetic study was carried out on Neoproterozoic samples from seven sites of the sub-basins of Gourma and Bobo Dioulasso, which include a Marinoan glaciogenic deposit. Magnetic mineralogy is represented essentially by magnetite and hematite. The mean directions of the sites are calculated on the high temperature component (500-670 °C). Two locations provide data constrained by statistical reversal and fold tests and determining Neoproterozoic virtual geomagnetic poles. The palaeolatitudes display very low values which place the West-African craton in the sub-equatorial position during the Marinoan glaciation. This result enhances the Snowball Earth hypothesis, which places most of the continental landmasses, and notably Africa, at low latitudes during the Neoproterozoic.

  8. Provenance evolution of the Jurassic northern Qaidam Basin (West China) and its geological implications: evidence from detrital zircon geochronology

    Science.gov (United States)

    Yu, Long; Xiao, Ancheng; Wu, Lei; Tian, Yuntao; Rittner, Martin; Lou, Qianqian; Pan, Xiaotian

    2017-03-01

    The Jurassic system is the major hydrocarbon source rock and of crucial importance for understanding the Mesozoic intra-continental tectonics in West China. This paper presents systematic detrital zircon geochronology of the Jurassic outcropping at the Dameigou locality in the northern Qaidam Basin, and reports 1000 single-grain U-Pb zircon ages that have implications for the provenance, the corresponding basin property as well as the tectonic setting of West China during Jurassic. Zircon ages exhibit two major clusters at 250 and 2400 Ma whereas two minor clusters at 450 and 850 Ma, suggesting primary sources from the East Kunlun Shan and Oulongbuluke Block, secondary sources from the North Qaidam UHP belt and South Qilian Shan. Combined with observation of lithology and sedimentary facies, two rifting periods were inferred in the earliest Jurassic and the early stage of the Middle Jurassic, respectively, accompanied by further extension throughout the Jurassic. Our results do not support a foreland basin related to the Jurassic southward thrusting of the South Qilian Shan, but favor that the Mesozoic intra-continental tectonics in West China were characterised by pulsed responses to specific collisions rather than a persisting contractional setting during Jurassic period.

  9. Wave transport in the South Australian Basin

    Science.gov (United States)

    Bye, John A. T.; James, Charles

    2018-02-01

    The specification of the dynamics of the air-sea boundary layer is of fundamental importance to oceanography. There is a voluminous literature on the subject, however a strong link between the velocity profile due to waves and that due to turbulent processes in the wave boundary layer does not appear to have been established. Here we specify the velocity profile due to the wave field using the Toba spectrum, and the velocity profile due to turbulence at the sea surface by the net effect of slip and wave breaking in which slip is the dominant process. Under this specification, the inertial coupling of the two fluids for a constant viscosity Ekman layer yields two independent estimates for the frictional parameter (which is a function of the 10 m drag coefficient and the peak wave period) of the coupled system, one of which is due to the surface Ekman current and the other to the peak wave period. We show that the median values of these two estimates, evaluated from a ROMS simulation over the period 2011-2012 at a station on the Southern Shelf in the South Australian Basin, are similar in strong support of the air-sea boundary layer model. On integrating over the planetary boundary layer we obtain the Ekman transport (w*2/f) and the wave transport due to a truncated Toba spectrum (w*zB/κ) where w* is the friction velocity in water, f is the Coriolis parameter, κ is von Karman's constant and zB = g T2/8 π2 is the depth of wave influence in which g is the acceleration of gravity and T is the peak wave period. A comparison of daily estimates shows that the wave transports from the truncated Toba spectrum and from the SWAN spectral model are highly correlated (r = 0.82) and that on average the Toba estimates are about 86% of the SWAN estimates due to the omission of low frequency tails of the spectra, although for wave transports less than about 0.5 m2 s-1 the estimates are almost equal. In the South Australian Basin the Toba wave transport is on average about 42% of

  10. Subsidence history of the eastern Northern South Yellow Sea Basin, offshore Korea

    Science.gov (United States)

    Lee, Eunyoung

    2010-05-01

    The Northern South Yellow Sea Basin (NSYSB) is located between East China and West Korea, and is one of the basins in eastern Asia where rifting started in the late Mesozoic time, caused by large-scale interaction between the Pacific, Eurasian, and Indian plates. To analyze the detailed tectonic evolution of this basin, this study focuses on backstripping the subsidence history of four representative structures selected in the basin. This paper examines sag and half-graben structures in the Central Sub-basin as well as half-graben and graben structures in the SW Sub-basin. By sedimentary backstripping, the subsidence history of the eastern NSYSB can be grouped into a main subsidence phase in the Late Cretaceous - Oligocene and a secondary subsidence phase in the Middle Miocene - present. Both subsidence phases are separated by the uplift and erosion phase during Early Miocene times. The main subsidence phase itself consists of a rapid subsidence in the Late Cretaceous - Paleocene and a slow subsidence phases in the Eocene - Oligocene. These subsidence phases of this basin can be correlated to MSQ I, II and III identified in the SW Sub-basin with seismic stratigraphy, and can further be related to the convergence movement of Pacific-Eurasia and Indian-Eurasia plates.

  11. K West Basin Sand Filter Backwash Sample Analysis

    Energy Technology Data Exchange (ETDEWEB)

    Fiskum, Sandra K. [Pacific Northwest National Lab. (PNNL), Richland, WA (United States); Smoot, Margaret R. [Pacific Northwest National Lab. (PNNL), Richland, WA (United States); Coffey, Deborah S. [Pacific Northwest National Lab. (PNNL), Richland, WA (United States); Pool, Karl N. [Pacific Northwest National Lab. (PNNL), Richland, WA (United States)

    2016-03-01

    A sand filter is used to help maintain water clarity at the K West Basin where highly radioactive sludge is stored. Eventually that sand filter will require disposal. The radionuclide content of the solids trapped in the sand filter will affect the selection of the sand filter disposal pathway. The Pacific Northwest National Laboratory (PNNL) was contracted by the K Basin Operations & Plateau Remediation Project (operations contractor CH2M Hill) to analyze the radionuclide content of the solids collected from the backwash of the K West Basin sand filter. The radionuclide composition in the sand filter backwash solids will be used by CH2M Hill to determine if the sand filter media and retained sludge solids will be designated as transuranic waste for disposal purposes or can be processed through less expensive means. On October 19, 2015, K Basin Operations & Plateau Remediation Project staff backwashed the sand filter into the North Load-Out Pit (NLOP) and immediately collected sample slurry from a sampling tube positioned 24 in. above the NLOP floor. The 764 g sand filter backwash slurry sample, KW-105 SFBW-001, was submitted to PNNL for analysis on October 20, 2015. Solids from the slurry sample were consolidated into two samples (i.e., a primary and a duplicate sample) by centrifuging and measured for mass (0.82 g combined – wet centrifuged solids basis) and volume (0.80 mL combined). The solids were a dark brown/orange color, consistent with iron oxide/hydroxide. The solids were dried; the combined dry solids mass was 0.1113 g, corresponding to 0.0146 weight percent (wt%) solids in the original submitted sample slurry. The solids were acid-digested using nitric and hydrochloric acids. Insoluble solids developed upon dilution with 0.5 M HNO3, corresponding to an average 6.5 wt% of the initial dry solids content. The acid digestate and insoluble solids were analyzed separately by gamma spectrometry. Nominally, 7.7% of the 60Co was present

  12. Budgeting Systems in Universities in South-West Nigeria | Alabi ...

    African Journals Online (AJOL)

    Stratified random sampling was used to select seven universities from five states within the hinterland of Nigeria's South-West geopolitical zone. ... Also, out of the total sum of N80,115,006,285 as expenditure on six selected priority areas in the three academic years by the sampled universities, salaries and allowances had ...

  13. promoting integrated water resources management in south west

    African Journals Online (AJOL)

    eobe

    The management of these schemes is 100% controlled by government, hence the frequency of low capacity utilization and lack of sustainable investment in the sector. One of the problems of the water sector in south west. Nigeria is that of low quality personnel especially in the technical aspects. The dearth of key personnel.

  14. The Suppression of Internal Unrest in South West Africa (Namibia ...

    African Journals Online (AJOL)

    The tactical deployment of ground forces in conjunction with aircraft was an innovation that transformed future operations in SWA between the suppression of the Bondelswarts and the actions against Chief Ipumbu. This article discusses the utilisation of the Union Defence Force (UDF) and South West Africa Forces against ...

  15. Spinner dolphins Stenella longirostris off south-west Mauritius ...

    African Journals Online (AJOL)

    Spinner dolphins Stenella longirostris longirostris off the south-west coast of Mauritius are subject to ongoing anthropogenic disturbance in the form of daily dolphin tourism, which has intensified since 1998. Abundance of this species was estimated using photo-identification data and mark-recapture analysis. Between April ...

  16. Leishmaniasis in South West Africa: preliminary notes on host ...

    African Journals Online (AJOL)

    Studies were undertaken to determine the sandfly fauna of South West Africa with the view to finding possible vectors of leishmaniasis, and to locate a host reservoir. A possible vector species belonging to the Synphlebotomus group of sandflies, which have been incriminated as leishmania vectors in Kenya, has been found ...

  17. Statolith comparison of two south-west Atlantic Loliginid squid ...

    African Journals Online (AJOL)

    The statoliths of two South-West Atlantic loliginid squid, Loligo gahi and Loligo sanpaulensis, were studied to determine if they could be a useful tool for species differentiation. Allometric equations were employed to examine differences in statolith shape and growth. Statolith dimensions were standardized by total length ...

  18. Climatology and Landfall of Tropical Cyclones in the South- West ...

    African Journals Online (AJOL)

    Abstract—The climatology of cyclone formation and behaviour in the South-West Indian Ocean, including landfall in Mozambique and Madagascar, has been investigated. The records used were obtained by merging track data from the Joint Typhoon Warning Centre with data from La Reunion – Regional Specialised ...

  19. Application of Basin Morphometry Laws in catchments of the south-western quadrangle of south-eastern Nigeria

    Science.gov (United States)

    Aisuebeogun, A. O.; Ezekwe, I. C.

    2013-09-01

    The relationship between process and form has been at the core of research in fluvial geomorphology. Form-process relationships of a natural river basin are strongly influenced by its hydrologic and sedimentologic processes as basin morphometric properties of length, shape, and relief, change in response to various hydrologic stimuli from the environment, but usually in line with well established laws. In the four river basins (Orashi, Otamiri, Sombreiro, New Calabar) examined in this study, however, empirical evidence does not conform neatly with theoretical postulates. Remarkable variations are noted in the morphometric properties of the catchments, when compared with established morphometric laws. The most varied in conformity are the Orashi and New Calabar basins, although the Sombreiro and Otamiri catchments also show some level of variation. Prime explanation for the morphometric and topographic non-conformity is caused by the nature of surficial material and the profoundly shallow relief of much of the study area, especially the alluvial flood and deltaic plains to the south and south-west of the study area.

  20. Characterization and evolution of primary and secondary laterites in northwestern Bengal Basin, West Bengal, India

    Directory of Open Access Journals (Sweden)

    Sandipan Ghosh

    2015-04-01

    Full Text Available It is quite impossible to travel far in India without observing the remarkable ferruginous crust to which Buchanan in 1807 gave the name of laterite. In Indian peninsula, it is a post-Cretaceous stratigraphic succession with a polycyclic nature of evolution which marks the unconformity with recent Quaternary alluvium. There are perennial problems and research gaps in the investigation of laterites in India as well as in West Bengal: (1 defining, identifying and classifying lateritic materials, (2 mode of formation of laterite and its other horizons, (3 determining the ages of laterites, (4 reliability of laterites as palaeoclimatic indicators, (5 identifying topographic requirements and pedogeomorphic processes for laterite formation, and (6 reconstructions of former lateritized landscapes. The formation of north‒south lateritic hard crust (i.e. Rarh Bengal on the Rajmahal Basalt Traps, Archean granite‒gneiss, Gondwana sediments, Paleogene gravels and older deltaic alluvium is analyzed here to resolve the aforesaid problems and to depict the variable characteristics of laterites with special reference to its tectono-climatic evolution in the northwestern marginal part of Bengal Basin. This paper reveals that the low-level secondary laterites (probably the Pliocene‒Early Pleistocene age of Rarh Bengal are composed of heterogeneous Fe‒Al rich gravelly materials which were derived from the high-level primary laterites (probably the Eocene‒Miocene age of plateau since the Paleogene Period by the peninsular river system, following the underlying structure of Bengal Basin. Alongside the roles of drifting of Indian Plate, establishment of monsoon climate, neo-tectonic uplifts and re-lateritization of ferruginous shelf deposits are determined here to unearth the palaeogenesis of primary and secondary laterites in West Bengal.

  1. Surveillance of maternal antibodies against West Nile virus in chicken eggs in South-West Germany.

    Science.gov (United States)

    Börstler, Jessica; Engel, Dimitri; Petersen, Mathis; Poggensee, Claudia; Jansen, Stephanie; Schmidt-Chanasit, Jonas; Lühken, Renke

    2016-05-01

    The emergence of West Nile virus (WNV) in several European countries increases the risk of its introduction to Germany. This study evaluated a new method for WNV surveillance by testing for maternal antibodies in chicken eggs. A total of 1,990 eggs were collected in 35 sampling sites in the south-west of Germany and tested for WNV-specific antibodies. The results did not indicate evidence for WNV circulation in the study area. This work serves as a proof-of-concept that such a method is useful and a potential alternative to use of sentinel chicken for regular WNV surveillance. © 2016 John Wiley & Sons Ltd.

  2. Natural Increase in the Baltic South and South-West

    Directory of Open Access Journals (Sweden)

    Michalski T.

    2014-06-01

    Full Text Available This article analyses the natural population increase (decrease in the postcommunist part of Baltic Europe (the federated state of Mecklenburg-Western Pomerania, West Pomeranian, Pomeranian, and Warmian-Masurian Voivodeships, Lithuania, Latvia, Estonia, the Kaliningrad and Leningrad region, and the federal city of Saint Petersburg in 2002—2011. The study uses standard methods of demographic analysis, the data provided by national statistical services and Eurostat. All regions analysed are characterised by a low stationary phase of the demographic transition model (DTM. The situation proves to be unfavourable in the Polish regions under consideration and highly unfavourable in the remaining area.

  3. Fluid inclusions in quartz crystals from South-West Africa.

    Science.gov (United States)

    Kvenvolden, K. A.; Roedder, E.

    1971-01-01

    Quartz crystals from calcite veins of unknown age in Precambrian metasedimentary rocks at Geiaus No. 6 and Aukam farms in South-West Africa contain both primary and secondary inclusions filled with one substance or a combination of substances. These substances include organic liquid, moderately saline aqueous liquid, dark-colored solid, and a vapor. Analysis of these materials by microscopy and by gas chromatography and mass spectrometry shows the presence of constituents of both low and high molecular weights.

  4. Thallium in the hydrosphere of south west England

    Energy Technology Data Exchange (ETDEWEB)

    Law, Sin [School of Geography, Earth and Environmental Sciences, University of Plymouth, Drake Circus, Plymouth PL4 8AA (United Kingdom); Turner, Andrew, E-mail: aturner@plymouth.ac.uk [School of Geography, Earth and Environmental Sciences, University of Plymouth, Drake Circus, Plymouth PL4 8AA (United Kingdom)

    2011-12-15

    Thallium is a highly toxic metal whose environmental concentrations, distributions and behaviour are not well understood. In the present study we measure the concentrations of Tl in filtered and unfiltered samples of rain, tap, river, estuarine and waste waters collected from south west England. Dissolved Tl was lowest (<20 ng L{sup -1}) in tap water, rain water, treated sewage and landfill effluents, estuarine waters, and rivers draining catchments of sandstones and shales. Concentrations up to about 450 ng L{sup -1} were observed in rivers whose catchments are partly mineralized and where metal mining was historically important, and the highest concentration ({approx}1400 ng L{sup -1}) was measured in water abstracted directly from an abandoned mine. Compared with other trace metals measured (e.g. As, Cd, Co, Cr, Cu, Ni, Pb, Zn), Tl has a low affinity for suspended particles and undergoes little removal by conventional (hydroxide precipitation) treatment of mine water. - Highlights: > Thallium concentrations have been measured in natural and waste waters from south west England. > Dissolved concentrations spanned three orders of magnitude and were highest in water from an abandoned mine. > Inputs associated with historical metal mine workings are the most important to the regional hydrosphere. - Concentrations of dissolved thallium in waters of south west England span two orders of magnitude and are greatest in water from an abandoned mine.

  5. Environmental conflicts in the South Durban Basin: Integrating ...

    African Journals Online (AJOL)

    Environmental conflicts in the South. Durban Basin: Integrating residents' perceptions and concerns resulting from air pollution. Jyoti Jaggernath*. Abstract ... the effects of air pollution on human health and ecology that are caused by the ..... a further 22% indicating that white vapours from the steam generated at Mondi.

  6. Environmental conflicts in the South Durban Basin: Integrating ...

    African Journals Online (AJOL)

    With a complex mix of large scale industries and major transport networks, the. South Durban Basin (SDB) residential area has been subjected to a considerable amount of environmental impacts and conflicts. A major concern in the area is the effects of air pollution on human health and ecology that are caused by the.

  7. Hydrogeology and water quality of the West Valley Creek Basin, Chester County, Pennsylvania

    Science.gov (United States)

    Senior, L.A.; Sloto, R.A.; Reif, A.G.

    1997-01-01

    The West Valley Creek Basin drains 20.9 square miles in the Piedmont Physiographic Province of southeastern Pennsylvania and is partly underlain by carbonate rocks that are highly productive aquifers. The basin is undergoing rapid urbanization that includes changes in land use and increases in demand for public water supply and wastewater disposal. Ground water is the sole source of supply in the basin. West Valley Creek flows southwest in a 1.5-mile-wide valley that is underlain by folded and faulted carbonate rocks and trends east-northeast, parallel to regional geologic structures. The valley is flanked by hills underlain by quartzite and gneiss to the north and by phyllite and schist to the south. Surface water and ground water flow from the hills toward the center of the valley. Ground water in the valley flows west-southwest parallel to the course of the stream. Seepage investigations identified losing reaches in the headwaters area where streams are underlain by carbonate rocks and gaining reaches downstream. Tributaries contribute about 75 percent of streamflow. The ground-water and surface-water divides do not coincide in the carbonate valley. The ground-water divide is about 0.5 miles west of the surface-water divide at the eastern edge of the carbonate valley. Underflow to the east is about 1.1 inches per year. Quarry dewatering operations at the western edge of the valley may act partly as an artificial basin boundary, preventing underflow to the west. Water budgets for 1990, a year of normal precipitation (45.8 inches), and 1991, a year of sub-normal precipitation (41.5 inches), were calculated. Streamflow was 14.61 inches in 1990 and 12.08 inches in 1991. Evapotranspiration was estimated to range from 50 to 60 percent of precipitation. Base flow was about 62 percent of streamflow in both years. Exportation by sewer systems was about 3 inches from the basin and, at times, equaled base flow during the dry autumn of 1991. Recharge was estimated to be 18

  8. Geology Structure Identification Using Pre-Stack Depth Migration (PSDM Method of Tomography Result in North West Java Basin

    Directory of Open Access Journals (Sweden)

    Sudra Irawan

    2017-06-01

    Full Text Available North West Java Basin is a tertiary sedimentary basin which is located in the right of the western part of the Java island. North West Java Basin is geodynamic where currently located at the rear position of the path of the volcanic arc of Java that is the result of the India-Australia plate subduction to the south towards the Eurasian plate (Explanation of Sunda in the north. Geology structure observation is difficult to be conducted at Quaternary volcanicfield due to the classical problem at tropical region. In the study interpretation of fault structures can be done on a cross-section of Pre-Stack Depth Migration (PSDM used prayer namely Hardware Key Device, ie Central Processing Unit: RedHat Enterprise Linux AS 5.0, prayer Monitor 24-inch pieces, Server: SGI altix 450/SuSe Linux Enterprise Server 9.0, 32 GB, 32 X 2,6 GHz Procesor, network: Gigabyte 1 Gb/s, and the software used is paradigm, product: Seismic Processing and Imaging. The third fault obtained in this study in accordance with the geological information derived from previous research conducted by geologists. The second general direction is northwest-southeast direction represented by Baribis fault, fault-fault in the Valley Cimandiri and Gunung Walat. This direction is often known as the directions Meratus (Meratus Trend. Meratus directions interpreted as directions that follow the pattern of continuous arc Cretaceous age to Meratus in Kalimantan.

  9. Implication of drainage basin parameters of a tropical river basin of South India

    Science.gov (United States)

    Babu, K. J.; Sreekumar, S.; Aslam, Arish

    2016-03-01

    Drainage morphometry provides quantitative description of the drainage system which is an important aspect of the characterisation of watersheds. Chalakudi River is one of the important rivers of the South India which has attracted attention of many environmental scientists recently because of the proposed Athirapally Hydel Project across the river. SRTM (Shuttle Radar Topographic Mission) data were used for preparing DEM (Digital Elevation Model), Aspect Map and Slope Map. Geographical Information System (GIS) was used for the evaluation of linear, areal and relief aspects of morphometric parameters. The study reveals that the terrain exhibits dentritic and trellis pattern of drainage. The Chalakudi River Basin has a total area of 1,448.73 km2 and is designated as seventh-order basin. The drainage density of the basin is estimated as 2.54 and the lower-order streams mostly dominate the basin. The high basin relief indicates high runoff and sediment transport. The elongation ratio of the Chalakudi Basin is estimated as 0.48 and indicates that the shape of the basin is elongated. The development of stream segments in the basin area is more or less effected by rainfall. Relief ratio indicates that the discharge capability of watershed is very high and the groundwater potential is meagre. The low value of drainage density in spite of mountainous relief indicates that the area is covered by dense vegetation and resistant rocks permeated by fractures and joints. These studies are helpful in watershed development planning and wise utilization of natural resources.

  10. Fault distribution to the west of Songliao Basin by means of gravity analysis

    Science.gov (United States)

    Chen, Jun; Li, Shizhen; Zhou, Xingui

    2017-04-01

    Our study area is located to the west of Songliao Basin, northeastern China. Its tectonic setting includes three parts, the Argun block, the Higgnan block and the Songnen block from north to south. It belongs to the northeastern Asia orogenic zone surrounded by the Siberia plate, the North China plate and the Pacific plate. As the global feature, the gravity anomaly values increase from west to east, and from southwest to northeast. The minimum value is 5mGal, and the maximum value is 5mGal. In the southwestern region, the variation range is from -87mGal to 65mGal. But in the northeastern region, it is between -65mGal and 55mGal. In the central region, the gravity anomaly values are between -55mGal and 25mGal, and the gravity anomaly gradient is bigger than that in other regions. In the eastern region, gravity anomaly values are bigger than those in other regions, and the gravity anomaly characteristics is complicated. There are gravity anomaly gradient belts, anomaly direction changes, distortion of contour lines, broaden or narrowed of the closed contour lines. Gravity anomaly data can be used for study of tectonics division and regional geological structures. The gravity anomaly data has been processed using many methods. Firstly, analytic upward- continuation and apparent-depth filtering were used to separate the gravity anomaly field with different depth and different scale. Then, horizontal derivatives, vertical derivatives, analytical signal calculation, small sub-domain filtering were used to increase the gravity resolution for fault discrimination. Through the interpretation of different depth and different scale gravity anomalies, we mapped the fault distribution of the study area. There are four types of faults with different trends, which are north east-east(NEE), near west-east(WE), north-east(NE) and north-west(NW). The NE and NW trending faults are distributed in the whole region. The WE trending faults are located mainly in the southern region of

  11. Water Accounting Plus for sustainable water management in the Volta river basin, West Africa

    Science.gov (United States)

    Dembélé, Moctar; Schaefli, Bettina; Mariéthoz, Grégroire; Ceperley, Natalie; Zwart, Sander J.

    2017-04-01

    Water Accounting Plus (WA+) is a standard framework that provides estimates of manageable and unmanageable water flows, stocks, consumption among users, and interactions with land use. The water balance terms are estimated based on remotely sensed data from online open access databases. The main difference with other methods is the use of spatiotemporal data, limiting the errors due to the use of static data. So far, no studies have incorporated climate change scenarios in the WA+ framework to assess future water resources, which would be desirable for developing mitigation and adaptation policies. Moreover WA+ has been implemented using remote sensing data while hydrological models data can also be used as inputs for projections on the future water accounts. This study aims to address the above challenges by providing quantified information on the current and projected state of the Volta basin water resources through the WA+ framework. The transboundary Volta basin in West Africa is vulnerable to floods and droughts that damage properties and take lives. Residents are dependent on subsistence agriculture, mainly rainfed, which is sensitive to changes and variation in the climate. Spatially, rainfall shows high spatiotemporal variability with a south-north gradient of increasing aridity. As in many basins in semi-arid environments, most of the rainfall in the Volta basin returns to the atmosphere. The competition for scarce water resources will increase in the near future due to the combined effects of urbanization, economic development, and rapid population growth. Moreover, upstream and downstream countries do not agree on their national priorities regarding the use of water and this brings tensions among them. Burkina Faso increasingly builds small and medium reservoirs for small-scale irrigation, while Ghana seeks to increase electricity production. Information on current and future water resources and uses is thus fundamental for water actors. The adopted

  12. Hydrogeology of the West Branch Delaware River basin, Delaware County, New York

    Science.gov (United States)

    Reynolds, Richard J.

    2013-01-01

    In 2009, the U.S. Geological Survey, in cooperation with the New York State Department of Environmental Conservation, began a study of the hydrogeology of the West Branch Delaware River (Cannonsville Reservoir) watershed. There has been recent interest by energy companies in developing the natural gas reserves that are trapped within the Marcellus Shale, which is part of the Hamilton Group of Devonian age that underlies all the West Branch Delaware River Basin. Knowing the extent and thickness of stratified-drift (sand and gravel) aquifers within this basin can help State and Federal regulatory agencies evaluate any effects on these aquifers that gas-well drilling might produce. This report describes the hydrogeology of the 455-square-mile basin in the southwestern Catskill Mountain region of southeastern New York and includes a detailed surficial geologic map of the basin. Analysis of surficial geologic data indicates that the most widespread surficial geologic unit within the basin is till, which is present as deposits of ablation till in major stream valleys and as thick deposits of lodgment till that fill upland basins. Till and colluvium (remobilized till) cover about 89 percent of the West Branch Delaware River Basin, whereas stratified drift (outwash and ice-contact deposits) and alluvium account for 8.9 percent. The Cannonsville Reservoir occupies about 1.9 percent of the basin area. Large areas of outwash and ice-contact deposits occupy the West Branch Delaware River valley along its entire length. These deposits form a stratified-drift aquifer that ranges in thickness from 40 to 50 feet (ft) in the upper West Branch Delaware River valley, from 70 to 140 ft in the middle West Branch Delaware River valley, and from 60 to 70 ft in the lower West Branch Delaware River valley. The gas-bearing Marcellus Shale underlies the entire West Branch Delaware River Basin and ranges in thickness from 600 to 650 ft along the northern divide of the basin to 750 ft thick

  13. South/South, South/North conversations: South Africa, India, the west

    African Journals Online (AJOL)

    The essay explores a model of literary-historical analysis and evaluation that avoids 'anxiogenic' (anxiety-ridden) or competitive comparisons of centres and peripheries: the north versus the south, the First World versus the Third World or, in antagonistic reaction, the Empire writing back to the centre. Instead, a multilingual ...

  14. Sampling South Pole-Aitken Basin: The Moonrise Approach

    Science.gov (United States)

    Jolliff, B. L.; Shearer, C. K.; Cohen, B. A.

    2012-01-01

    The South Pole-Aitken basin (SPA) is the largest of the giant impact basins in the inner Solar System, and its location on Earth s Moon makes it the most accessible. Exploration of SPA through direct collection and analysis of representative materials addresses issues as fundamental as the characteristics of the chemical reservoir from which the Moon originated, early differentiation and production of crust and development of global asymmetry, relationships between magmatic activity and internal thermal evolution, and effects of giant impact events on the terrestrial planets. Owing to its great size and superposition relationships with other lunar impact basins, SPA is the oldest and as such anchors the lunar chronology. Moreover, numerous large impact craters and basins are contained within it such that materials (rocks) of the SPA basin contain a record of the early impact chronology, one less likely to have been affected by the large, late nearside basins (e.g., Imbrium). Understanding the early basin chronology is key to deciphering the sequence and effects of early giant impact bombardment of the inner Solar System. That record exists on the Moon, and materials of the SPA basin will allow us to read that record. Knowledge of the early bombardment history will test - and may reshape - a key paradigm relating to early Solar System evolution. Did the planets form with the alignment of today, or was there a major reorientation of the giant planets that led to destabilization of asteroid orbits, and a cataclysmic bombardment of the inner Solar System hundreds of millions of years after accretion of the planets? Implications include understanding environments for early life-supporting habitats on Earth and Mars, and relationships to new observations of extra-solar planetary systems.

  15. Forest cover disturbances in the South Taiga of West Siberia

    Energy Technology Data Exchange (ETDEWEB)

    Dyukarev, E A; Pologova, N N; Golovatskaya, E A; Dyukarev, A G, E-mail: egor@imces.ru [Institute of Monitoring of Climatic and Ecological Systems SB RAS, Akademicheskii Prospekt 10/3 (Russian Federation)

    2011-07-15

    Analysis of vegetation cover and tendencies in forest cover changes at a typical site in the south of West Siberia was performed using remote sensing observations from Landsat. The Northern Eurasia Land Cover legend was used for the assessment of unsupervised classification results. The land cover maps constructed have shown that about half of the study area is occupied by wetlands with several distinctively different vegetation types. The area studied is typical for the South Taiga zone (ecoregion) of Western Siberia from the Ob' river to the Irtysh river, where loamy and clayey soil forming rocks are widespread. Similar vegetation structures dominate over 600 000 km{sup 2}, or about 20%, of the West Siberia area. Analyses of the forest cover changes show that the forest cover loss is not very significant. The area of forest disturbed in 1990-9 is equal to 16 008 ha. The area of forest disturbances during the 2000-7 period was about twice as high (30 907 ha). The main reasons for the forest reduction are intensive forest harvesting and strong windthrow. The high sustainability of the region studied against anthropogenic impacts is explained by the high overall wetness of the territory, the small population density, and the prevalence of deciduous forests at different succession stages with rich vegetation cover.

  16. Modelling the hydrocarbon generation and migration in the West Netherlands Basin, the Netherlands

    NARCIS (Netherlands)

    Balen, R.T. van; Bergen, F. van; Leeuw, C. de; Pagnier, H.; Simmelink, H.; Wees, J.D. van; Verweij, J.M.

    2000-01-01

    The hydrocarbon systems of the Mesozoic, inverted West Netherlands Basin have been analyzed using 2-D forward modelling. Three source rocks are considered in the modelling: Lower Jurassic oil-prone shales, Westphalian gas-prone coal deposits, and Lower Namurian oil-prone shales. The Lower Namurian

  17. K West Basin Integrated Water Treatment System (IWTS) E-F Annular Filter Vessel Accident Calculations

    Energy Technology Data Exchange (ETDEWEB)

    RITTMANN, P.D.

    1999-10-07

    Three bounding accidents postdated for the K West Basin integrated water treatment system are evaluated against applicable risk evaluation guidelines. The accidents are a spray leak during fuel retrieval, spray leak during backflushing, and a hydrogen explosion. Event trees and accident probabilities are estimated. In all cases, the unmitigated dose consequences are below the risk evaluation guidelines.

  18. Late Eocene sea retreat from the Tarim Basin (west China) and concomitant Asian paleoenvironmental change

    NARCIS (Netherlands)

    Bosboom, R.E.; Dupont-Nivet, G.; Houben, A.J.P.; Brinkhuis, H.; Villa, G.; Mandic, O.; Stoica, M.; Zachariasse, W.J.; Guo, ZJ.; Li, CX.; Krijgsman, W.

    2011-01-01

    The Paleogene sediments of the southwest Tarim Basin along the West Kunlun Shan in western China include the remnants of the easternmost extent of a large epicontinental sea. This shallow sea once extended across the Eurasian continent before it retreated westward and eventually separated as the

  19. K West Basin Integrated Water Treatment System (IWTS) E-F Annular Filter Vessel Accident Calculations

    Energy Technology Data Exchange (ETDEWEB)

    PIEPHO, M.G.

    2000-01-10

    Four bounding accidents postulated for the K West Basin integrated water treatment system are evaluated against applicable risk evaluation guidelines. The accidents are a spray leak during fuel retrieval, spray leak during backflushing a hydrogen explosion, and a fire breaching filter vessel and enclosure. Event trees and accident probabilities are estimated. In all cases, the unmitigated dose consequences are below the risk evaluation guidelines.

  20. Technical Efficiency of Small-Scale Rabbit Production in South-West ...

    African Journals Online (AJOL)

    This study examines technical efficiency of rabbit rearing in South-west Nigeria. Data were collected from 150 rabbit farmsteads across states in the South-West Nigeria. The Cobb-Douglas Stochastic Production Frontier Functions were used to analyse the study data. Stochastic Production Frontier Function estimates ...

  1. The Influence of Ownership and Type of University on Work Environment in South West Nigerian Universities

    Science.gov (United States)

    Arogundade, B. B.

    2012-01-01

    This paper examined the influence of ownership and type of university on work environment in South West Nigerian universities. The study population consists of all academic staff of the ten public and nine private universities in South West Nigeria. In all, 500 respondents selected from eight universities constituted the sample of the study. The…

  2. From transpression to trnstension along the west Barents margin: the Forlandsundet basin, W. Svalbard

    Science.gov (United States)

    Terje Osmundsen, Per; Redfield, Thomas F.; Ganerød, Morgan; Appleyard, Tyler; Peron-Pinvidic, Gwenn; Schaaf, Niklas

    2017-04-01

    The enigmatic and understudied Forlandsundet Basin in western Svalbard represents the outermost onshore Cenozoic basin along the NE Atlantic margin. It occupies a key location to understand the margińs tectono-sedimentary history as the margin switched from transpression to transtension in the late Paleogene. During Paleocene and Eocene time, the Barents segment of the NE Atlantic margin accommodated dextral shear between Svalbard and Greenland resulting in the formation of a transpressional orogen and associated foreland basin in western Spitsbergen. At anomaly 13 time (c. 33Ma), re-arrangement of the spreading system in the North Atlantic included formation of the obliquely ultraslow-spreading Knipovitch Ridge west of Spitsbergen. Ridge formation was preceded by a very dramatic reduction of crustal thickness west of Spitsbergen. The Forlandsundet Graben structure sits at the shoulder of a very narrow necking domain developed along parts of the sheared margin, where continental crust was thinned to a few kilometers or less over c. 100 km horizontal distance. The basin geometry is that of an asymmetric graben to half-graben filled with coarse continental-derived siliciclastics and finer-grained marine sediments. Parts of the outcropping stratigraphy represent continental-derived conglomeratic debris flows deposited into the marine environment. The basin is poorly dated but ages ranging from the Eocene to Early/Late Oligocene have been proposed by previous workers based on fossils and strontium isotope data. The basin is bound by normal/oblique faults that truncate the Paleocene-Eocene W. Spitsbergen fold and thrust belt, which may favor the Oligocene age. Both normal/oblique faults and contractional structures in the form of folds and thrusts are documented. Large-scale folds are oriented at an oblique to high angle compared with structures in the fold and thrust belt, but approximate the NW-SE maximum elongation trend as recorded by a number of oblique-slip and

  3. Thallium in the hydrosphere of south west England.

    Science.gov (United States)

    Law, Sin; Turner, Andrew

    2011-12-01

    Thallium is a highly toxic metal whose environmental concentrations, distributions and behaviour are not well understood. In the present study we measure the concentrations of Tl in filtered and unfiltered samples of rain, tap, river, estuarine and waste waters collected from south west England. Dissolved Tl was lowest (<20 ng L(-1)) in tap water, rain water, treated sewage and landfill effluents, estuarine waters, and rivers draining catchments of sandstones and shales. Concentrations up to about 450 ng L(-1) were observed in rivers whose catchments are partly mineralized and where metal mining was historically important, and the highest concentration (~1400 ng L(-1)) was measured in water abstracted directly from an abandoned mine. Compared with other trace metals measured (e.g. As, Cd, Co, Cr, Cu, Ni, Pb, Zn), Tl has a low affinity for suspended particles and undergoes little removal by conventional (hydroxide precipitation) treatment of mine water. Copyright © 2011 Elsevier Ltd. All rights reserved.

  4. Ethnobotanical studies of folklore phytocosmetics of South West Nigeria.

    Science.gov (United States)

    Fred-Jaiyesimi, Adediwura; Ajibesin, K K; Tolulope, Odeyemi; Gbemisola, Ogundokun

    2015-03-01

    Phytocosmetic is an important aspect of folklore medicine of many cultures whose records and information are scanty. This study inventoried the various plants used as folklore cosmetics in some parts of Oyo, Ogun, Ekiti, and Lagos States of Nigeria by administering semi-structured questionnaires. The survey was carried out between February 2010 and August 2013 through a semi-structured interview; questionnaires were given to obtain information on the local names, morphological parts used, and part(s) of the body where cosmetic preparations are applied. In this study, 80 species belonging to 39 families were identified with members of the Fabaceae, Asteraceae, and Euphorbiaceae most often mentioned. This study is able to record the remaining available information on phytocosmetics in traditional medicine orally passed down through generations in South West Nigeria.

  5. Sedimentary Record of the Back-Arc Basins of South-Central Mexico: an Evolution from Extensional Basin to Carbonate Platform.

    Science.gov (United States)

    Sierra-Rojas, M. I.; Molina-Garza, R. S.; Lawton, T. F.

    2015-12-01

    The Lower Cretaceous depositional systems of southwestern Oaxaquia, in south-central Mexico, were controlled by tectonic processes related to the instauration of a continental arc and the accretion of the Guerrero arc to mainland Mexico. The Atzompa Formation refers to a succession of conglomerate, sandstone, siltstone, and limestone that crop out in southwestern Mexico with Early Cretaceous fauna and detrital zircon maximum depositional ages. The sedimentary record shows a transition from early fluvial/alluvial to shallow marine depositional environments. The first stage corresponds to juvenile fluvial/alluvial setting followed by a deep lacustrine depositional environment, suggesting the early stages of an extensional basin. The second stage is characterized by anabranched deposits of axial fluvial systems flowing to the NE-SE, showing deposition during a period of rapid subsidence. The third and final stage is made of tidal deposits followed, in turn, by abrupt marine flooding of the basin and development of a Barremian-Aptian carbonate ramp. We interpret the Tentzo basin as a response to crustal extension in a back-arc setting, with high rates of sedimentation in the early stages of the basin (3-4 mm/m.y), slower rates during the development of starved fluvial to tidal systems and carbonate ramps, and at the top of the Atzompa Formation an abrupt deepening of the basin due to flexural subsidence related to terrane docking and attendant thrusting to the west. These events were recorded in the back-arc region of a continental convergent margin (Zicapa arc) where syn-sedimentary magmatism is indicated by Early Cretaceous detrital and volcanic clasts from alluvial fan facies west of the basin. Finally, and as a response to the accretion of the Guerrero superterrane to Oaxaquia during the Aptian, a carbonate platform facing toward the Gulf of Mexico was established in central to eastern Oaxaquia.

  6. Characteristics of the Triassic Source Rocks of the Aitutu Formation in the (West) Timor Basin

    OpenAIRE

    Asep Kurnia Permana; Aries Kusworo; Andi Heri Prastian

    2014-01-01

    DOI:10.17014/ijog.v1i3.192The Triassic rocks of the (West) Timor Basin have been identified that was mainly deposited in the  marine environment. The fine grained clastics and carbonate  rocks of this Triassic marine  facies are considered to be the most promising source rocks potential in this basin. In this paper we present geochemical and petrographic data from outcrop samples of the Triassic carbonate Aitutu Formation, due to emphasized the organic maturation, kerogen type of the organic ...

  7. The West Andaman Fault: A complex strain‐partitioning boundary at the seaward edge of the Aceh Basin, offshore Sumatra

    National Research Council Canada - National Science Library

    Martin, Kylara M; Gulick, Sean P. S; Austin, James A; Berglar, Kai; Franke, Dieter; Udrekh

    2014-01-01

    ...‐D multichannel seismic survey (SUMUT) acquired aboard the R/V Sonne in 2008 with previous bathymetry and seismic surveys to characterize the West Andaman Fault adjacent to the Aceh forearc Basin. Two...

  8. The Potential of Ketungau and Silat Shales in Ketungau and Melawi Basins, West Kalimantan: For Oil Shale and Shale Gas Exploration

    Directory of Open Access Journals (Sweden)

    Lauti Dwita Santy

    2014-07-01

    Full Text Available DOI: 10.17014/ijog.v8i1.154The Ketungau and Melawi Basins, in West Kalimantan, are Tertiary intramontane basins of which the potential for economic conventional oil and gas discoveries have not previously been confirmed. The Ketungau Basin is bordered by the Melawi Basin in the south. Besides non-ideal trapping mechanisms, another major problem in these basins is source rock maturation. Nevertheless, both basins are promising to be explored for oil shale and shale gas energy resources. Therefore, the aim of this paper is to give some perspectives on their source rocks, as an input for the evaluation of the potential of unconventional oil and gas. About twenty samples collected from the Ketungau and Melawi Basins were analyzed using pyrolysis and organic petrographic methods. The results show a poor to good quality of source rock potential. The Ketungau shale, which is the main source rock in the Ketungau Basin, is dominated by type III, immature, and gas prone kerogen. The Silat shale, which is the main source rock in the Melawi Basin, is dominated by type II, immature to early mature, mixed gas, and oil prone kerogen. In the field, Ketungau and Silat Formations have a widespread distribution, and are typically 900 m to 1000 m thick. Both the Ketungau and Silat shales occur within synclinal structures, which have a poor trapping mechanism for conventional oil or gas targets, but are suitable for oil shale and shale gas exploration. This early stage of research clearly shows good potential for the future development of unconventional energy within the Ketungau and Melawi Basins.

  9. A review of stratigraphy and sedimentary environments of the Karoo Basin of South Africa

    Science.gov (United States)

    Smith, R. M. H.

    . Deformation of the southern rim of the basin, caused by the subducting palaeo-Pacific plate, resulted in mountain ranges far to the south. Material derived from this source, as well as granitic uplands to the west and morth-east, was deposited on large deltas that built out into the Ecca sea (Upper Ecca). The relatively cool climate and lowland setting promoted thick accumulations of peat on the coastal and delta plains and which now constitute the major coal reserves of southern Africa. Later the prograding deltas coalesced to fill most of the basin after which fluvial sedimentation of the Beaufort Group dominated. The climate by this time (Late Permian) had warmed to become semi-arid with highly seasonal rainfall. The central parts of the basin were for the most part drained by fine-grained meanderbelts and semi-permanent lakes. Significant stratabound uranium reserves have been delimited in the channel sandstones of the Beaufort Group in the southwestern parts of the basin. Pulses of uplift in the southern source areas combined with a possible orogenic effect resulted in two coarser-grained alluvial fans prograding into the more central parts of the basin (Katberg Sandstone Member and Molteno Formation). In the upper Karoo sequence progressive aridification dominated depositional style with playa lake and wadi-type environments (Elliot Formation) that finally gave way to a dune sand dominated system (Clarens Formation). Basinwide volcanic activity of the early Jurassic Drakensberg Group brought deposition in the Karoo Basin to a close.

  10. Fog-water harvesting along the West Coast of South Africa: A ...

    African Journals Online (AJOL)

    drinie

    2002-10-04

    Oct 4, 2002 ... Department of Anthropology, Archaeology, Geography and Environmental Studies, University of South Africa, PO Box 392,. UNISA 0003, South Africa. Abstract. Many parts of the West Coast of South Africa experience severe water shortages throughout the year. Despite the meager rainfall, however, the ...

  11. Tectonic implications of Mesozoic magmatism to initiation of Cenozoic basin development within the passive South China Sea margin

    Science.gov (United States)

    Mai, Hue Anh; Chan, Yu Lu; Yeh, Meng Wan; Lee, Tung Yi

    2017-09-01

    The South China Sea (SCS) is one of the classical example of a non-volcanic passive margin situated within three tectonic plates of the Eurasian, Indo-Australian and Philippine Sea plate. The development of SCS resulted from interaction of various types of plate boundaries, and complex tectonic assemblage of micro blocks and accretionary prisms. Numerous models were proposed for the formation of SCS, yet none can fully satisfy different aspects of tectonic forces. Temporal and geographical reconstruction of Cretaceous and Cenozoic magmatism with the isochrones of major basins was conducted. Our reconstruction indicated the SE margin of Asia had gone through two crustal thinning events. The sites for rifting development are controlled by localized thermal weakening of magmatism. NW-SE extension setting during Late Cretaceous revealed by magmatism distribution and sedimentary basins allow us to allocate the retreated subduction of Pacific plate to the cause of first crustal thinning event. A magmatic gap between 75 and 65 Ma prior to the initiation of first basin rifting suggested a significant modification of geodynamic setting occurred. The Tainan basin, Pearl River Mouth basin, and Liyue basins started to develop since 65 Ma where the youngest Late Cretaceous magmatism concentrated. Sporadic bimodal volcanism between 65 and 40 Ma indicates further continental extension prior to the opening of SCS. The E-W extension of Malay basin and West Natuna began since late Eocene followed by N-S rifting of SCS as Neotethys subducted. The SCS ridge developed between Pearl River Mouth basin and Liyue basin where 40 Ma volcanic activities concentrated. The interaction of two continental stretching events by Pacific followed by Neotethys subduction with localized magmatic thermal weakening is the cause for the non-volcanic nature of SCS.

  12. Vitrinite reflectance data for the Permian Basin, west Texas and southeast New Mexico

    Science.gov (United States)

    Pawlewicz, Mark; Barker, Charles E.; McDonald, Sargent

    2005-01-01

    This report presents a compilation of vitrinite reflectance (Ro) data based on analyses of samples of drill cuttings collected from 74 boreholes spread throughout the Permian Basin of west Texas and southeast New Mexico (fig. 1). The resulting data consist of 3 to 24 individual Ro analyses representing progressively deeper stratigraphic units in each of the boreholes (table 1). The samples, Cambrian-Ordovician to Cretaceous in age, were collected at depths ranging from 200 ft to more than 22,100 ft.The R0 data were plotted on maps that depict three different maturation levels for organic matter in the sedimentary rocks of the Permian Basin (figs. 2-4). These maps show depths at the various borehole locations where the R0 values were calculated to be 0.6 (fig. 2), 1.3 (fig. 3), and 2.0 (fig. 4) percent, which correspond, generally, to the onset of oil generation, the onset of oil cracking, and the limit of oil preservation, respectively.The four major geologic structural features within the Permian Basin–Midland Basin, Delaware Basin, Central Basin Platform, and Northwest Shelf (fig. 1) differ in overall depth, thermal history and tectonic style. In the western Delaware Basin, for example, higher maturation is observed at relatively shallow depths, resulting from uplift and eastward basin tilting that began in the Mississippian and ultimately exposed older, thermally mature rocks. Maturity was further enhanced in this basin by the emplacement of early and mid-Tertiary intrusives. Volcanic activity also appears to have been a controlling factor for maturation of organic matter in the southern part of the otherwise tectonically stable Northwest Shelf (Barker and Pawlewicz, 1987). Depths to the three different Ro values are greatest in the eastern Delaware Basin and southern Midland Basin. This appears to be a function of tectonic activity related to the Marathon-Ouachita orogeny, during the Late-Middle Pennsylvanian, whose affects were widespread across the Permian

  13. Hydro engineering Feasibility Study of Surface Runoff Water Harvesting in Al-Ajeej Basin, North West Iraq

    Directory of Open Access Journals (Sweden)

    Thair M. Al-Taiee

    2013-04-01

    Full Text Available The hydro engineering  characteristics of Al-Ajeej basin which was located within south Sinjar plain north west Iraq was analyzed to predict the possibility of surface runoff harvesting during rainfall season in the upstream sites in this basin using watershed modeling system (WMS. The hydrological feasibility of constructing small dam on Al-Ajeej valley with some preliminary design calculations were presented. The best optimum dam site was selected to be located (3.95 km downstream the confluence of Al-Badee branch with Al-Ajeej valley (35° 46¢ 6² Latitude and Longitude 41° 36¢ 11² having a catchment's area of (3043km2. The proposed dam  height was (12.5 meter with a dam length of (1277m, while the normal storage volume of the reservoir is (38.8 million m3. Construction a dams in such sites characterized by water shortage during all  around the year will give an aid in the sustainable development of such area by increasing  the cultivation lands, the agricultural products and also modify the income of the villagers living  in this area leading to prevent them leaving their lands to other places

  14. Water quality assessment of Ogun river, South West Nigeria.

    Science.gov (United States)

    Jaji, M O; Bamgbose, O; Odukoya, O O; Arowolo, T A

    2007-10-01

    The quality of Ogun river in South-West, Nigeria was studied by a field survey for a period of 1 year (covering dry season and rainy season). Water samples were collected from thirteen sites and analysed for physico-chemical and bacteriological parameters as well as heavy metals using standard methods. Generally, the values obtained for turbidity, phosphate, oil and grease, iron and faecal coliform from all the sites in both seasons were above the maximum acceptable limit set by the World Health Organization (WHO) for drinking water. Also, the manganese content from all the sites in the dry season, lead concentrations from three sites in the dry season and cadmium concentrations from some sites in both seasons were above the WHO limit. The values obtained for total dissolved solids, dissolved oxygen and chloride at site M in the dry season and nitrate at site J in the rainy season were also above the WHO limit. Pollution of Ogun river water along its course is evidenced by the high concentrations of pollution indicators, nutrients and trace metals above the acceptable limit. This poses a health risk to several rural communities who rely on the river primarily as their source of domestic water. The study showed a need for continuous pollution monitoring programme of surface waters in Nigeria.

  15. New insights on aerosol sources and properties of Organics in the west Mediterranean basin

    Science.gov (United States)

    Nicolas, José B.; Sciare, Jean; Petit, Jean-Eudes; Bonnaire, Nicolas; Féron, Anais; Dulac, François; Hamonou, Eric; Gros, Valérie; Mallet, Marc; Lambert, Dominique; Sauvage, Stéphane; Léonardis, Thierry; Tison, Emmanuel; Colomb, Aurélie; Fresney, Evelyn; Pichon, Jean-Marc; Bouvier, Laetitia; Bourrianne, Thierry; Roberts, Gregory

    2013-04-01

    -MS). Additional measurements of reactive gases (CO, O3 and VOCs), and of aerosol optical/physical properties (scattering, extinction, size distribution) were used for a better identification of air masses origin and optical/number closure studies. Backtrajectories issued from Hysplit 4.9 revealed the predominance of air masses from North-West to South, with some dust events from North Africa (Morocco, Algeria) and a few anthropogenic events from Italy and from South-East of France. Two intense heat waves, associated with low wind speed, gave the highest levels of OA observed during the campaign, suggesting a possible local biogenic origin. The comparison of these heat waves showed contrasted levels of WSOC, oxalate, OM-to-OC ratio suggesting various sources and/or processes.

  16. Cladocera in the estuarine and coastal waters of south-west coast of India

    Digital Repository Service at National Institute of Oceanography (India)

    Madhupratap, M.

    Occurrence and abundance of marine Cladocera in several estuaries along the south-west coast of India is presented and compared with their distribution in the coastal waters. One peculiar feature observed was their absence in the estuaries during...

  17. Statistical Analysis of Acoustic Signal Propagating Through the South China Sea Basin

    Science.gov (United States)

    2016-03-01

    ANALYSIS OF ACOUSTIC SIGNAL PROPAGATING THROUGH THE SOUTH CHINA SEA BASIN by Meihuei Chen March 2016 Thesis Advisor...ACOUSTIC SIGNAL PROPAGATING THROUGH THE SOUTH CHINA SEA BASIN 5. FUNDING NUMBERS 6. AUTHOR(S) Meihuei Chen 7. PERFORMING ORGANIZATION NAME(S) AND...acoustics, South China Sea , statistics, sound propagation variability 15. NUMBER OF PAGES 43 16. PRICE CODE 17. SECURITY CLASSIFICATION OF REPORT

  18. Post-breakup Basin Evolution along the South-Atlantic Margins

    Science.gov (United States)

    Strozyk, Frank; Back, Stefan; Kukla, Peter

    2014-05-01

    The post-breakup tectono-stratigraphic evolution of large offshore basins along the South American and African continental margins record strongly varying post-rift sedimentary successions. The northernmost segment of the South Atlantic rift and salt basins is characterized by a pronounced asymmetry, with the Brazilian margin comprising narrower and deeper rift basins with less salt in comparison to the Congo-Gabon conjugate margin. Another important observation is that multiple phases of uplift and subsidence are recorded after the break-up of the southern South Atlantic on both sides of the Florianopolis-Walvis Ridge volcanic complex, features that are regarded as atypical when compared to published examples of other post-breakup margin successions. A regional comparison based on tectonic-stratigraphic analysis of selected seismic transects between the large basins offshore southern Brazil (Espirito Santo Basin, Campos Basin, Santos Basin, Pelotas Basin) and southwest Africa (Lower Congo Basin, Kwanza Basin, Namibe Basin, Walvis Basin) provides a comprehensive basin-to-basin documentation of the key geological parameters controlling ocean and continental margin development. This comparison includes the margin configuration, subsidence development through time, sediment influx and storage patterns, type of basin fill (e.g. salt vs. non-salt systems; carbonate-rich vs. clastics-dominated systems) and finally major tectonic and magmatic events. Data from the salt basins indicate that salt-related tectonic deformation is amongst the prime controls for the non-uniform post-rift margin development. The diversity in the stratigraphic architecture of the conjugate margins offshore southern Brazil, Namibia and Angola reflects variations in the interplay of a number of controlling factors, of which the most important are (a) the structural configuration of each margin segment at the time of break-up, (b) the post break-up subsidence history of the respective margin segment

  19. Bovine cysticercosis and human taeniosis in South-west Shoa zone ...

    African Journals Online (AJOL)

    Bovine cysticercosis and human taeniosis in South-west Shoa zone of. Oromia Region, Ethiopia. 1. Adugna ... Tulu Bolo and Weliso abattoirs in southwest shoa zone of Oromia region, Ethiopia to estimate the prevalence of ..... (2008) who reported 44.2% live and 65.8% dead cysts in. Hawassa abattoir (South Ethiopia).

  20. Redescription of Argulus multipocula Barnard, 1955 (Crustacea: Branchiura) collected on the west coast of South Africa.

    Science.gov (United States)

    Smit, Nico J; Van As, Liesl L; Van As, Jo G

    2005-01-01

    Argulus multipocula Barnard, 1955 was originally described from a single female found in a littoral sample from the east coast of South Africa. We present a redescription of this species based on light and scanning electron microscope studies of 25 females collected from the southern mullet Liza richardsonii (Smith) on the west coast of South Africa.

  1. Impacts of climate change on hydro-meteorological drought over the Volta Basin, West Africa

    Science.gov (United States)

    Oguntunde, Philip G.; Abiodun, Babatunde J.; Lischeid, Gunnar

    2017-08-01

    This study examines the characteristics of drought in the Volta River Basin (VRB), investigates the influence of drought on the streamflow, and projects the impacts of future climate change on the drought. A combination of observation data and regional climate simulations of past and future climates (1970-2013, 2046-2065, and 2081-2100) were analyzed for the study. The Standardized Precipitation Index (SPI) and Standardized Precipitation and Evapotranspiration (SPEI) were used to characterize drought while the Standardized Runoff Index (SRI) were used to quantify runoff. Results of the study show that the historical pattern of drought is generally consistent with previous studies over the Basin and most part of West Africa. RCA ensemble medians (RMED) give realistic simulations of drought characteristics and area extent over the Basin and the sub-catchments in the past climate. Generally, an increase in drought intensity and spatial extent are projected over VRB for SPEI and SPI, but the magnitude of increase is higher with SPEI than with SPI. Drought frequency (events per decade) may be magnified by a factor of 1.2 (2046-2065) to 1.6 (2081-2100) compared to the present day episodes in the basin. The coupling between streamflow and drought episodes was very strong (P climate change that could have consequences on agriculture, water resources and energy supply.

  2. Marine ice sheet collapse potentially under way for the Thwaites Glacier Basin, West Antarctica.

    Science.gov (United States)

    Joughin, Ian; Smith, Benjamin E; Medley, Brooke

    2014-05-16

    Resting atop a deep marine basin, the West Antarctic Ice Sheet has long been considered prone to instability. Using a numerical model, we investigated the sensitivity of Thwaites Glacier to ocean melt and whether its unstable retreat is already under way. Our model reproduces observed losses when forced with ocean melt comparable to estimates. Simulated losses are moderate (1 mm per year of sea-level rise) collapse in the different simulations within the range of 200 to 900 years. Copyright © 2014, American Association for the Advancement of Science.

  3. Impact of climate change on the groundwater run-off in south-west Poland

    Directory of Open Access Journals (Sweden)

    Olichwer Tomasz

    2014-10-01

    Full Text Available The article discusses the variability of total runoff and groundwater run-off affected by global and local climate changes using the example of 17 selected river basins located in south-west Poland. Based on the data collected from 1966 to 2005, the average annual values of the total and groundwater run-off, aswell as the seven-day annual minimum flows, were estimated, which provided useful information about droughts. The calculated parameters were compared with precipitation, air temperature, aridity index (the ratio of the precipitation and potential evapotranspiration, and the NAO (North Atlantic Oscillation and AMO (Atlantic Multidecadal Oscillation indices. There were no significant changes in the total run-off in the research area; however, there was a reduction in the groundwater run-off, which indicates change in groundwater recharge. The strongest relationship of total run-off, groundwater run-off and seven-day annual flow minimum was obtained from the NAO index,which confirms that the run-off from the study area is dependent on global factors. This is important for the estimation of changes in the runoff from the study area in response to the climate scenarios for the years 2011-2030, which indicate a fairly significant increase in air temperature and slight differences in precipitation. Based on extensive investigations, a reduction in the groundwater run-off in favour of increased surface run-off should be expected in the research area.

  4. Anthropogenic carbon dioxide in the South Atlantic western basin

    Science.gov (United States)

    Ríos, Aida F.; Vázquez-Rodríguez, Marcos; Padin, X. A.; Pérez, Fiz F.

    2010-10-01

    The meridional WOCE line A17 was conducted during the austral summer of 1994 parallel to the eastern South American coast, from 55°S to 10°S, where one of the main limbs of the North Atlantic Deep Water (NADW), i.e., the southward-flowing Deep Western Boundary Current (DWBC) is found. Full-depth profiles of pH, total alkalinity and total inorganic carbon were measured and checked with analytical CO 2 certified reference materials (CRMs), providing a high-quality dataset with good internal consistency for the CO 2 system parameters that is well suited for anthropogenic CO 2 (C ANT) estimation. For the first time in the western Atlantic basin the C ANT has been calculated using four independent approaches and results are compared. The methods considered are the CFC-based TTD method and the φC T°, TrOCA and ∆C* carbon system-based back-calculation methods. All four methods have produced C ANT distribution patterns that are in general good agreement: maximum concentrations of C ANT (50-60 μmol kg - 1 ) are predicted for the upper warm South Atlantic central waters from the tropical gyres, while the minima (~ 5 μmol kg - 1 ) are located in the old northward-flowing branch of Circumpolar Deep Water. There are, however, some discrepancies detected. The TrOCA method yields the highest overall [C ANT] values, even over the theoretical limit of C ANT saturation for 1994 in the upper layers. The ∆C* approach consistently yielded negative estimates of C ANT below 2800 dbar, even after correcting a reported - 8 μmol kg - 1 bias in the alkalinity measurements of the WOCE A17 line. The main overall difference between the four methods corresponds to the relative C ANT maximum associated with the lower limb of NADW: this structure is well identified in the φC T° and TTD methods but seems to disappear in the case of TrOCA and ∆C*. In agreement with other intercomparison studies of C ANT, the specific inventories are significantly higher (~ 45%) than those reported in

  5. Epidemiology of West Nile Disease in Europe and in the Mediterranean Basin from 2009 to 2013

    Directory of Open Access Journals (Sweden)

    Daria Di Sabatino

    2014-01-01

    Full Text Available West Nile virus (WNV transmission has been confirmed in the last four years in Europe and in the Mediterranean Basin. An increasing concern towards West Nile disease (WND has been observed due to the high number of human and animal cases reported in these areas confirming the importance of this zoonosis. A new epidemiological scenario is currently emerging: although new introductions of the virus from abroad are always possible, confirming the epidemiological role played by migratory birds, the infection endemisation in some European territories today is a reality supported by the constant reoccurrence of the same strains across years in the same geographical areas. Despite the WND reoccurrence in the Old World, the overwintering mechanisms are not well known, and the role of local resident birds or mosquitoes in this context is poorly understood. A recent new epidemiological scenario is the spread of lineage 2 strain across European and Mediterranean countries in regions where lineage 1 strain is still circulating creating favourable conditions for genetic reassortments and emergence of new strains. This paper summarizes the main epidemiological findings on WNV occurrence in Europe and in the Mediterranean Basin from 2009 to 2013, considering potential future spread patterns.

  6. Application of advanced reservoir characterization, simulation and production optimization strategies to maximize recovery in slope and basin clastic reservoirs, West Texas (Delaware Basin). Annual report

    Energy Technology Data Exchange (ETDEWEB)

    Dutton, S.P.; Asquith, G.B.; Barton, M.D.; Cole, A.G.; Gogas, J.; Malik, M.A.; Clift, S.J.; Guzman, J.I.

    1997-11-01

    The objective of this project is to demonstrate that detailed reservoir characterization of slope and basin clastic reservoirs in sandstones of the Delaware Mountain Group in the Delaware Basin of West Texas and New Mexico is a cost-effective way to recover a higher percentage of the original oil in place through strategic placement of infill wells and geologically based field development. This project involves reservoir characterization of two Late Permian slope and basin clastic reservoirs in the Delaware Basin, West Texas, followed by a field demonstration in one of the fields. The fields being investigated are Geraldine Ford and Ford West fields in Reeves and Culberson Counties, Texas. Project objectives are divided into two major phases, reservoir characterization and implementation. The objectives of the reservoir characterization phase of the project were to provide a detailed understanding of the architecture and heterogeneity of the two fields, the Ford Geraldine unit and Ford West field. Reservoir characterization utilized 3-D seismic data, high-resolution sequence stratigraphy, subsurface field studies, outcrop characterization, and other techniques. Once reservoir characterized was completed, a pilot area of approximately 1 mi{sup 2} at the northern end of the Ford Geraldine unit was chosen for reservoir simulation. This report summarizes the results of the second year of reservoir characterization.

  7. Karst Aquifer Recharge: A Case History of over Simplification from the Uley South Basin, South Australia

    Directory of Open Access Journals (Sweden)

    Nara Somaratne

    2015-02-01

    Full Text Available The article “Karst aquifer recharge: Comments on ‘Characteristics of Point Recharge in Karst Aquifers’, by Adrian D. Werner, 2014, Water 6, doi:10.3390/w6123727” provides misrepresentation in some parts of Somaratne [1]. The description of Uley South Quaternary Limestone (QL as unconsolidated or poorly consolidated aeolianite sediments with the presence of well-mixed groundwater in Uley South [2] appears unsubstantiated. Examination of 98 lithological descriptions with corresponding drillers’ logs show only two wells containing bands of unconsolidated sediments. In Uley South basin, about 70% of salinity profiles obtained by electrical conductivity (EC logging from monitoring wells show stratification. The central and north central areas of the basin receive leakage from the Tertiary Sand (TS aquifer thereby influencing QL groundwater characteristics, such as chemistry, age and isotope composition. The presence of conduit pathways is evident in salinity profiles taken away from TS water affected areas. Pumping tests derived aquifer parameters show strong heterogeneity, a typical characteristic of karst aquifers. Uley South QL aquifer recharge is derived from three sources; diffuse recharge, point recharge from sinkholes and continuous leakage of TS water. This limits application of recharge estimation methods, such as the conventional chloride mass balance (CMB as the basic premise of the CMB is violated. The conventional CMB is not suitable for accounting chloride mass balance in groundwater systems displaying extreme range of chloride concentrations and complex mixing [3]. Over simplification of karst aquifer systems to suit application of the conventional CMB or 1-D unsaturated modelling as described in Werner [2], is not suitable use of these recharge estimation methods.

  8. SUSTAINABLE DEVELOPMENT IN PUBLIC HEALTH IN THE SOUTH MUNTENIA REGION AND SOUTH WEST OLTENIA REGION

    Directory of Open Access Journals (Sweden)

    Georgiana Melania COSTAICHE

    2014-04-01

    Full Text Available The purpose of this paper is to highlight sustainable development in terms of health in two development regions of Romania, the South Muntenia region and South West Oltenia region. “Sustainable development is development which aims to meet the needs of the present without compromising the ability of future generations to meet their own needs”. Sustainable development objectives can not be achieved in conditions of ill health, and health is maintained in a functional and a healthy environment. To highlight the evolution of public health in the two regions for regional development and related counties, we used indicators of sustainable development in Romania, based on data provided by the Romanian Statistical Yearbooks for 2011, 2012 and 2013. Indicators used to assess health development in the two regions are: The mortality rate, the infant mortality rate, natural growth rate, hospital beds (per 1,000 inhabitants, population/doctor (per 1000 inhabitants. Research methods applied are clues fixed base and chain base. Factors that increase the mortality rate are represented by a larger proportion of the elderly population, origin, given that rural health services are weak comparing to urban areas.

  9. Assessment of coalbed gas resources of the Central and South Sumatra Basin Provinces, Indonesia, 2016

    Science.gov (United States)

    Schenk, Christopher J.; Klett, Timothy R.; Tennyson, Marilyn E.; Mercier, Tracey J.; Brownfield, Michael E.; Pitman, Janet K.; Gaswirth, Stephanie B.; Finn, Thomas M.

    2016-12-09

    Using a geology-based assessment methodology, the U.S. Geological Survey estimated a mean of 20 trillion cubic feet of undiscovered, technically recoverable coalbed gas resource in the Central and South Sumatra Basin Provinces of Indonesia.

  10. Rock-Eval pyrolysis and vitrinite reflectance results from the Sheep Creek 1 well, Susitna basin, south-central Alaska

    Science.gov (United States)

    Stanley, Richard G.; Lillis, Paul G.; Pawlewicz, Mark J.; Haeussler, Peter J.

    2014-01-01

    We used Rock-Eval pyrolysis and vitrinite reflectance to examine the petroleum source potential of rock samples from the Sheep Creek 1 well in the Susitna basin of south-central Alaska. The results show that Miocene nonmarine coal, carbonaceous shale, and mudstone are potential sources of hydrocarbons and are thermally immature with respect to the oil window. In the samples that we studied, coals are more organic-rich and more oil-prone than carbonaceous shales and silty mudstones, which appear to be potential sources of natural gas. Lithologically similar rocks may be present in the deeper parts of the subsurface Susitna basin located west of the Sheep Creek 1 well, where they may have been buried deeply enough to generate oil and (or) gas. The Susitna basin is sparsely drilled and mostly unexplored, and no commercial production of hydrocarbons has been obtained. However, the existence of potential source rocks of oil and gas, as shown by our Rock-Eval results, suggests that undiscovered petroleum accumulations may be present in the Susitna basin.

  11. Tectonic subsidence of the Zhu 1 Sub-basin in the Pearl River Mouth Basin, northern South China Sea

    Science.gov (United States)

    Tang, Xiaoyin; Yang, Shuchun; Zhu, Junzhang; Long, Zulie; Jiang, Guangzheng; Huang, Shaopeng; Hu, Shengbiao

    2017-12-01

    The Pearl River Mouth Basin, which is situated on the northern margin of the South China Sea, has attracted great attention not only because of its tectonic setting but also because of its abundant hydrocarbon resources. We have analyzed the Cenozoic tectonic subsidence history of 4 drilled wells and 43 artificial wells from the Zhu 1 Sub-basin of the Pearl River Mouth Basin by back-stripping, using newly interpreted seismic profiles. We also calculated the average tectonic subsidence rates of the four sags in the Zhu 1 Sub-basin. The rifting and post-rifting stages are separated by abrupt changes in the tectonic subsidence curves and average subsidence rates. In the eastern sags of the Zhu 1 Sub-basin, tectonic subsidence started to slow at ca. 30 Ma, compared with ca. 23.8 Ma in the western sags. This probably corresponds to the timing of break-up and suggests that rifting in the Pearl River Mouth Basin ended earlier in the eastern sags than in the western sags. Anomalously accelerated tectonic subsidence occurred at 17.5-16.4 Ma during the post-rifting stage, with average subsidence rates as high as 301.9 m/Myr. This distinguishes the Pearl River Mouth Basin from classical Atlantic passive continental marginal basins, which demonstrate exponentially decaying post-rift tectonic subsidence.

  12. Raw water quality weight factors: Vaal basin, South Africa.

    Science.gov (United States)

    Dzwairo, B; Otieno, F A O; Ochieng, G M; Bezuidenhout, J J

    2012-01-01

    Weight factors (WFs) were developed for surface raw water pollution indicator variables in Vaal River's Upper and Middle Vaal sub-basins, in South Africa. The overall objective was to formulate a quantifiable ranking system to indicate importance of pollutant variables given their established effects on human and environmental health. Multi-criteria decision analysis (MCDA) was applied to qualitative data that were obtained from South Africa's target water quality ranges as well as from literature which represented expert opinion. The human and environmental health effect choice sets were ranked from 1 to 5 on nine pollutant variable criteria: NH3/NH4+, Cl-, conductivity (EC), dissolved oxygen (DO), pH, F-, NO3-/NO2-, PO4(3-) and SO4(2-). The weighted-sum method (WSM) then assigned highest and lowest normalised weights (NWs) to F- and Cl-, respectively, for human health effects (ɛhh) alternative. Highest and lowest NWs were assigned to NH3/NH4+ and EC, respectively, for environmental health effects (ɛeh) alternative. After aggregating the ɛhh and ɛeh WFs, resultant values ranked the variables from highest to lowest as follows: F->NO3-/NO2->/NH3/NH4+>DO>pH>SO4(2-)>PO4(3-)>EC>Cl-. The results represented the importance of variables given their established effects on human and environmental health. It was concluded that WFs provided a quantifiable barometer which could signal harmful exposure to elucidate negative effects of using polluted surface raw water in the study area. The values could be incorporated into water quality models like water quality indices. The approach could be used to develop WFs for other sites, taking into account issues like the site's pollution variables of concern as well as using a ranking key constructed from established literature.

  13. 75 FR 61414 - Basin Electric Power Cooperative: South Dakota PrairieWinds Project

    Science.gov (United States)

    2010-10-05

    ... wind turbine generators; 6,000-square-foot operations and maintenance building and fence perimeter; 64... Rural Utilities Service Basin Electric Power Cooperative: South Dakota PrairieWinds Project AGENCY... Electric Power Cooperative's (Basin Electric) application for a RUS loan and a Western interconnection...

  14. New Approach to Ranking of Jurassic Sedimentary Complexes of the Northern Part of the West Siberian Petroleum Basin

    Directory of Open Access Journals (Sweden)

    I.A. Panarin

    2017-11-01

    Full Text Available Recent events, such as the commencement of commercial development of the Novoportovskoye, Bovanenkovskoye fields in the Yamal Peninsula, the creation of infrastructure, pipeline and railway transport facilities, and the decision to build an liquified natural gas plant for the Tambey group of fields, – all of it builds a case for increasing the exploration of the resource base of the northern territories of West Siberian petroleum basin and the adjacent Kara Sea offshore. Jurassic hydrocarbon exploration leads/prospects have not been sufficiently studied and require additional exploration. The resource potential of Jurassic and Cretaceous reservoirs of South Kara region are estimated by various authors from 18,5 to 41,2 billion tons of oil equivalent. The systematization of information was executed from different sources and in the presented work was proposed the methodology for ranking the Jurassic sedimentary complexes. The ranking of selected fundamental characteristics were divided into three groups depending on their priority. This method allowed to determine the most prospective intervals of the Jurassic section for further study. The priority targets for further exploration in the Jurassic section based on the ranking results are the Middle Jurassic reservoirs of the Lower Bajocian-Upper Bathonian and Upper Aalenian-Lower Bajocian sedimentary complexes and the Upper Jurassic Callovian-Tithonian reservoirs.

  15. FUNCTIONING PECULIARITIES OF THE CONCEPTS OF NORTH, SOUTH, EAST, WEST IN JOHN CHEEVER’S WORKS

    OpenAIRE

    КРАСНИЦЬКА, Катерина Вікторівна

    2017-01-01

    The purpose of this article is the analysis of the verbalized concepts EAST, WEST, SOUTH, NORTH in the individual world image of a contemporary American writer John Cheever. The object of the present study are the individual image and axiological associations and also unique semantic components of the concepts EAST, WEST, SOUTH, NORTH, that are immanent to the conceptual world-image of the writer John Cheever and are refl ected in his works. The subject of the study are the lexemes that verba...

  16. Evidence that a West-East admixed population lived in the Tarim Basin as early as the early Bronze Age

    Directory of Open Access Journals (Sweden)

    Zhang Quanchao

    2010-02-01

    Full Text Available Abstract Background The Tarim Basin, located on the ancient Silk Road, played a very important role in the history of human migration and cultural communications between the West and the East. However, both the exact period at which the relevant events occurred and the origins of the people in the area remain very obscure. In this paper, we present data from the analyses of both Y chromosomal and mitochondrial DNA (mtDNA derived from human remains excavated from the Xiaohe cemetery, the oldest archeological site with human remains discovered in the Tarim Basin thus far. Results Mitochondrial DNA analysis showed that the Xiaohe people carried both the East Eurasian haplogroup (C and the West Eurasian haplogroups (H and K, whereas Y chromosomal DNA analysis revealed only the West Eurasian haplogroup R1a1a in the male individuals. Conclusion Our results demonstrated that the Xiaohe people were an admixture from populations originating from both the West and the East, implying that the Tarim Basin had been occupied by an admixed population since the early Bronze Age. To our knowledge, this is the earliest genetic evidence of an admixed population settled in the Tarim Basin.

  17. Evidence that a West-East admixed population lived in the Tarim Basin as early as the early Bronze Age.

    Science.gov (United States)

    Li, Chunxiang; Li, Hongjie; Cui, Yinqiu; Xie, Chengzhi; Cai, Dawei; Li, Wenying; Mair, Victor H; Xu, Zhi; Zhang, Quanchao; Abuduresule, Idelisi; Jin, Li; Zhu, Hong; Zhou, Hui

    2010-02-17

    The Tarim Basin, located on the ancient Silk Road, played a very important role in the history of human migration and cultural communications between the West and the East. However, both the exact period at which the relevant events occurred and the origins of the people in the area remain very obscure. In this paper, we present data from the analyses of both Y chromosomal and mitochondrial DNA (mtDNA) derived from human remains excavated from the Xiaohe cemetery, the oldest archeological site with human remains discovered in the Tarim Basin thus far. Mitochondrial DNA analysis showed that the Xiaohe people carried both the East Eurasian haplogroup (C) and the West Eurasian haplogroups (H and K), whereas Y chromosomal DNA analysis revealed only the West Eurasian haplogroup R1a1a in the male individuals. Our results demonstrated that the Xiaohe people were an admixture from populations originating from both the West and the East, implying that the Tarim Basin had been occupied by an admixed population since the early Bronze Age. To our knowledge, this is the earliest genetic evidence of an admixed population settled in the Tarim Basin.

  18. Hepatitis B: The view from West Africa | Lepore | South Sudan ...

    African Journals Online (AJOL)

    The Prevention of Liver Fibrosis and Cancer in Africa (PROLIFICA) study began in 2011 in The Gambia, Sénégal and Nigeria. The study aims to reduce the risk of hepatocellular carcinoma (HCC) in West Africa through the suppression of the Hepatitis B virus (HBV). The biological samples collected allow for the detection of ...

  19. Surface deformation on the west portion of the Chapala lake basin: uncertainties and facts

    Directory of Open Access Journals (Sweden)

    M. Hernandez-Marin

    2015-11-01

    Full Text Available In this study we investigate different aspects of land subsidence and ground failures occurring in the west portion of Chapala lake basin. Currently, surface discontinuities seem to be associated with subsiding bowls. In an effort to understand some of the conditioning factors to surface deformation, two sounding cores from the upper sequence (11 m depth were extracted for analyzing physical and mechanical properties. The upper subsoil showed a predominant silty composition and several lenses of pumice pyroclastic sand. Despite the relative predominance of fine soil, the subsoil shows mechanical properties with low clay content, variable water content, low plasticity and variable compressibility index, amongst some others. Some of these properties seem to be influenced by the sandy pyroclastic lenses, therefore, a potential source of the ground failure could be heterogeneities in the upper soil.

  20. Basin fill evolution and paleotectonic patterns along the Samfrau geosyncline: the Sauce Grande basin-Ventana foldbelt (Argentina) and Karoo basin-Cape foldbelt (South Africa) revisited

    Science.gov (United States)

    López-Gamundí, O. R.; Rossello, E. A.

    As integral parts of du Toit's (1927) ``Samfrau Geosyncline'', the Sauce Grande basin-Ventana foldbelt (Argentina) and Karoo basin-Cape foldbelt (South Africa) share similar paleoclimatic, paleogeographic, and paleotectonic aspects related to the Late Paleozoic tectono-magmatic activity along the Panthalassan continental margin of Gondwanaland. Late Carboniferou-earliest Permian glacial deposits were deposited in the Sauce Grande (Sauce Grande Formation) and Karoo (Dwyka Formation) basins and Falkland-Malvinas Islands (Lafonia Formation) during an initial (sag) phase of extension. The pre-breakup position of the Falkland (Malvinas) Islands on the easternmost part of the Karoo basin (immediately east of the coast of South Africa) is supported by recent paleomagnetic data, lithofacies associations, paleoice flow directions and age similarities between the Dwyka and the Lafonia glacial sequences. The desintegration of the Gondwanan Ice Sheet (GIS) triggered widespread transgressions, reflected in the stratigraphic record by the presence of inter-basinally correlatable, open marine, fine-grained deposits (Piedra Azul Formation in the Sauce Grande basin, Prince Albert Formation in the Karoo basin and Port Sussex Formation in the Falkland Islands) capping glacial marine sediments. These early postglacial transgressive deposits, characterised by fossils of the Eurydesma fauna and Glossopteris flora, represent the maximum flooding of the basins. Cratonward foreland subsidence was triggered by the San Rafael orogeny (ca. 270 Ma) in Argentina and propogated along the Gondwanan margin. This subsidence phase generated sufficient space to accommodate thick synorogenic sequences derived from the orogenic flanks of the Sauce Grande and Karoo basins. Compositionally, the initial extensional phase of these basins was characterized by quartz-rich, craton-derived detritus and was followed by a compressional (foreland) phase characterized by a paleocurrent reversal and dominance of

  1. Application of Advanced Reservoir Characterization, Simulation, and Production Optimization Strategies to Maximize Recovery in Slope and Basin Clastic Reservoirs, West Texas (Delaware Basin), Class III

    Energy Technology Data Exchange (ETDEWEB)

    Dutton, Shirley P.; Flanders, William A.

    2001-11-04

    The objective of this Class III project was demonstrate that reservoir characterization and enhanced oil recovery (EOR) by CO2 flood can increase production from slope and basin clastic reservoirs in sandstones of the Delaware Mountain Group in the Delaware Basin of West Texas and New Mexico. Phase 1 of the project, reservoir characterization, focused on Geraldine Ford and East Ford fields, which are Delaware Mountain Group fields that produce from the upper Bell Canyon Formation (Ramsey sandstone). The demonstration phase of the project was a CO2 flood conducted in East Ford field, which is operated by Orla Petco, Inc., as the East Ford unit.

  2. Characteristics of the Triassic Source Rocks of the Aitutu Formation in the (West Timor Basin

    Directory of Open Access Journals (Sweden)

    Asep Kurnia Permana

    2014-12-01

    Full Text Available DOI:10.17014/ijog.v1i3.192The Triassic rocks of the (West Timor Basin have been identified that was mainly deposited in the  marine environment. The fine grained clastics and carbonate  rocks of this Triassic marine  facies are considered to be the most promising source rocks potential in this basin. In this paper we present geochemical and petrographic data from outcrop samples of the Triassic carbonate Aitutu Formation, due to emphasized the organic maturation, kerogen type of the organic matter and the origin of the organic matter.  A representative of selected sample were subjected to the Rock-Eval Pyrolisis, vitrinite reflectance and thermal alteration index, bitumen extraction, were analyzed on the GC-MS. The samples were collected from marine deposit of the Triassic Sequence. The TOC values of the analyzed sample range between rich and rich organic richness (0.51% - 9.16%, wt.%, TOC, which consists mainly of type II and III kerogen and the organic matter consider to be predominantly oil/gas prone and gas prone potential. The thermal maturity assessed from Tmax, TAI, and vitrinite reflectance shows an immature to early peak mature stage of the organic matter. The GC-MS analyses of the biomarkers indicate mainly the organic matter derived from mixed source rocks facies containing alga debris and higher plant terrestrial origin.

  3. Integrated Flood Risk Assessment of Rural Communities in the Oti River Basin, West Africa

    Directory of Open Access Journals (Sweden)

    Kossi Komi

    2016-11-01

    Full Text Available Flood damage in West Africa has increased appreciably during the last two decades. Poor communities are more at risk due to the vulnerability of their livelihoods, especially in rural areas where access to services and infrastructures is limited. The aim of this paper is to identify the main factors that contribute to flood risk of rural communities in the Oti River Basin, Togo. A community-based disaster risk index model is applied. The analyses use primary data collected through questionnaires during fieldwork, the analytic hierarchy process (AHP method, population and housing census data and flood hazard mapping of the study area. The results showed a moderate level of flood risk despite a high level of hazard and vulnerability for all investigated communities. In addition, the results suggest that decreasing vulnerability through creation of new income-generating opportunities and increasing capacity of communities to manage their own flood risk should be paramount in order to reduce flood risk in the study area. The results of this work contribute to the understanding of flood risk and can be used to identify, assess, and compare flood-prone areas, as well as simulating the impacts of flood management measures in the Oti River Basin.

  4. Basement-involved faults and deep structures in the West Philippine Basin: constrains from gravity field

    Science.gov (United States)

    Wang, Gang; Jiang, Suhua; Li, Sanzhong; Zhang, Huixuan; Lei, Jianping; Gao, Song; Zhao, Feiyu

    2017-06-01

    To reveal the basement-involved faults and deep structures of the West Philippine Basin (WPB), the gravitational responses caused by these faults are observed and analyzed based on the latest spherical gravity model: WGM2012 Model. By mapping the free-air and Bouguer gravity anomalies, several main faults and some other linear structures are located and observed in the WPB. Then, by conducting a 2D discrete multi-scale wavelet decomposition, the Bouguer anomalies are decomposed into the first- to eighth-order detail and approximation fields (the first- to eighth-order Details and Approximations). The first- to third-order Details reflect detailed and localized geological information of the crust at different depths, and of which the higher-order reflects gravity field of the deeper depth. The first- to fourth-order Approximations represent the regional gravity fields at different depths of the crust, respectively. The fourth-order Approximation represents the regional gravity fluctuation caused by the density inhomogeneity of Moho interface. Therefore, taking the fourth-order Approximation as input, and adopting Parker-Oldenburg interactive inversion, We calculated the depth of Moho interface in the WPB. Results show that the Moho interface depth in the WPB ranges approximately from 8 to 12 km, indicating that there is typical oceanic crust in the basin. In the Urdaneta Plateau and the Benham Rise, the Moho interface depths are about 14 and 16 km, respectively, which provides a piece of evidence to support that the Banham Rise could be a transitional crust caused by a large igneous province. The second-order vertical derivative and the horizontal derivatives in direction 0° and 90° are computed based on the data of the third-order Detail, and most of the basement-involved faults and structures in the WPB, such as the Central Basin Fault Zone, the Gagua Ridge, the Luzon-Okinawa Fault Zone, and the Mindanao Fault Zone are interpreted by the gravity derivatives.

  5. The punctuation in the evolution of orbitoides in the campanian of South-West France

    NARCIS (Netherlands)

    Drooger, C.W.; Klerk, J.C. de

    1985-01-01

    For the Orbitoides assemblages analyzed from a number of closely sampled sections of Campanian calcarenites in south-west France there is a sudden change in the means of several parameters of the internal embryonicnepionic stage. The direction of the change is in accordance with the

  6. Motivations of farm tourism hosts and guests in the South West ...

    African Journals Online (AJOL)

    This paper describes a phenomenological investigation of the experience of farm tourism in the South West Tapestry Region of Western Australia from the perspective of both hosts and guests. The purpose of the study was to gain an understanding of what motivates people to operate a farm tourism business, and what ...

  7. Enhancement and identification of dust events in the south-west ...

    Indian Academy of Sciences (India)

    South-west Asia including the Middle East is one of the most prone regions to dust storm events. In recent years, there was an increase in the occurrence of these environmental and meteorological phenomena. Remote sensing could serve as an applicable method to detect and also characterise these events. In this study ...

  8. Marriage, Intimacy and Risk of HIV Infection in South West Uganda

    African Journals Online (AJOL)

    AJRH Managing Editor

    Long-term, monogamous, relationships are often portrayed as protective in HIV prevention campaigns. Focusing on marriage in a community in south west Uganda, we examine why and how people enter long term relationships, what their expectations are and what .... including accepting that he may take other wives.

  9. Surveys of virus diseases on pepper ( Capsicum spp.) in South-west ...

    African Journals Online (AJOL)

    Surveys to determine the incidence, diversity and distribution of viruses infecting pepper (Capsicum spp.) were conducted in six states (Oyo, Ondo, Osun, Ogun, Ekiti and Lagos) of South-west Nigeria in 2010 and 2011. Leaf samples from symptomatic and asymptomatic plants were collected at random from farmers' fields ...

  10. Dental Caries Trend among Adolescents in Lagos, South-West Nigeria

    African Journals Online (AJOL)

    OBJECTIVE: To determine the prevalence and severity of dental caries among adolescents in Lagos, South-west of Nigeria. METHODS: The World Health Organization (WHO) methodology for basic oral health surveys was employed. The study population was 11 to 16 year-old adolescents from primary and secondary.

  11. Job Performance and Gender Factors of Administrative Staff in South West Nigeria Universities

    Science.gov (United States)

    Olorunsola, E. O.

    2012-01-01

    This study examines the level of administrative staff job performance in South West Nigerian universities and also investigates whether the administrative staff job performance is related to their sexual characteristics. An instrument titled Job Performance Questionnaire (JPQ) was used to collect the data and was administered 400 subjects in…

  12. Stakeholders' Perception on the Investment in Higher Education in South-West Nigeria

    Science.gov (United States)

    Babalola, J. B.; Olaiya, Foluke M.

    2013-01-01

    This paper reviews the perceptions of stakeholders on investment in higher education and economic development in south-west Nigeria. The study was based on the argument that despite the fact that Nigeria celebrates her wealth of human capital and boasts of her educated labour force, there is still widespread ignorance and poverty with no…

  13. Fog-water harvesting along the West Coast of South Africa: a ...

    African Journals Online (AJOL)

    Many parts of the West Coast of South Africa experience severe water shortages throughout the year. Despite the meager rainfall, however, the region is subject to a high incidence of fog which might provide water for water-poor communities. This paper investigates the fog water potential of the area. Since fog water ...

  14. LABOUR MARKET IN DEVELOPMENT REGION SOUTH WEST OLTENIA – REALITIES AND PERSPECTIVES

    Directory of Open Access Journals (Sweden)

    Rabontu Cecilia Irina

    2013-06-01

    Full Text Available Over the years the South West Oltenia Region have developed important activities in different areas. The most important activities are related to agriculture and natural potential and deposits, the South West Oltenia being one of the most important energy providers in the country. In this area that we brought into talk we find all sectors of the national economy. Agriculture is considered to be an important branch with a significant share in regional GDP with industry (food, non-ferrous metallurgy aluminum, chemical, electrical, machinery, light industry but we must also talk about the tertiary sector gets consistent in the economy of the region as well as nationally. We have proposed in this paper to provide an overview of the labor market in the Development South-West Oltenia Region,integrating it into national labor market realities. We will follow this to see if the labor market in the South-West Oltenia Region, reflect, generally, national trends. To analyze what we are proposed we used the latest official labor market statistics but to have a clearer picture on this field we used data provided by the National Commission of Forecasting, indicating the source.

  15. Multielemental composition of atmospheric aerosol in the South of West Siberia

    CERN Document Server

    Koutsenogii, K P; Smirnova, A I; Makarov, V I; Kirov, E I

    2000-01-01

    The data on the multielemental composition of atmospheric aerosols for the typical landscapes of Novosibirsk region have been obtained using SR XRF. The peculiarities of seasonal variations in the multielemental composition of atmospheric aerosols in the South of West Siberia have been analyzed.

  16. Coping with drought risk: empirical analysis of farmers' drought adaption in the south-west Netherlands

    NARCIS (Netherlands)

    van Duinen, Rianne; Filatova, Tatiana; Geurts, Petrus A.T.M.; van der Veen, A.

    2014-01-01

    Climate change projections show that periods of droughts are likely to increase, causing decreasing water availability, salinization, and consequently farm income loss in the south-west Netherlands. Adaptation is the key to decrease a farmer's drought vulnerability and to secure the agricultural

  17. Characteristics of Zircon in Placer Deposits along the West Coast of South Africa

    NARCIS (Netherlands)

    Philander, C.; Rozendaal, A.; de Meijer, R.J.

    Mining along the west coast of South Africa is dominated by the exploitation of onshore and offshore diamond deposits. The relatively recent discovery of vast resources of heavy minerals in the area has resulted in the establishment of a major related industry. Today, Namakwa Sands is a

  18. Buruli Ulcer: A Case Report from South-West, Nigeria Nigerian ...

    African Journals Online (AJOL)

    We present a case report of a 15 year-old girl with Buruli ulcer which was confirmed during assessment/advocacy visit to a secondary Health facility in south-west, Nigeria by Global Buruli Ulcer Initiative, a WHO initiative. This case underscores the need for more education of health care providers working in the endemic ...

  19. The issue of forced labour in the 'Onjembo' : German South West Africa 1904-1908

    NARCIS (Netherlands)

    Gewald, J.B.

    1995-01-01

    In January 1904 the 'Onjembo', the Herero-German war, broke out. During the course of seven months the Herero were driven back from their ancestral homes and lands and forced to retreat into the northeastern reaches of the then German colony of South West Africa, the present-day Republic of Namibia.

  20. 3D seismic analysis of the AK Fault, Orange Basin, South Africa: Implications for hydrocarbon leakage and offshore neotectonics

    Science.gov (United States)

    Isiaka, Ahmed I.; Durrheim, Raymond J.; Manzi, Musa S. D.; Andreoli, Marco A. G.

    2017-11-01

    A high-resolution 3D reflection seismic dataset was used to achieve a detailed description of the half-graben bounded AK Fault in the Ibhubesi gas field of the offshore Orange Basin. Seismic analysis of the fault involved the combination of both the conventional seismic interpretation and seismic attributes. The main objective of the study was to provide insights into hydrocarbon leakage and neotectonic activity along the west coast shelf of South Africa. The AK Fault is among the several half-graben bounded faults that formed in the Late Jurassic to Early Cretaceous during the separation of the South American and the African continents. The AK Fault consists of five seismically detectable segments, whose evolution reflects characteristics of both the ;coherent; and the ;isolated; end-members model of segmented fault origin. Diapiric structures that are direct indicators of vertical fluid movement were also observed along the AK Fault system, providing evidence of significant roles that the fault plays in promoting the vertical migration of hydrocarbon in the Orange Basin. Recent reactivation of the fault has also occurred along an oblique extensional regime that is dominated by normal dip-slip faulting, with minor shear components along the tips.

  1. Constraining the vertical surface motions of the Hampshire Basin, south England During the Cenozoic

    Science.gov (United States)

    Smith, Philip; England, Richard; Zalasiewicz, Jan

    2016-04-01

    The potential effect of rising sea level on the UK has received considerable attention in recent years. However, the ongoing long-term changes in surface topography of the UK driven by regional tectonics and the mechanisms responsible are not fully understood. It is thought that glacial loading/unloading is the primary influence. However, this is inconsistent with present-day vertical surface motions recorded from Continuous Global Positioning Stations (CGPS) across the UK. The lateral variations in the present day motions are too complex to be explained by glacial isostatic rebound. We are investigating the hypothesis that the vertical motions of SE England also reflect the long term tectonic history by backstripping the Cenozoic geological record. So far the Paleogene stratigraphic record of the Hampshire basin in southern England has been investigated and using a series of deep boreholes that reach the chalk basement, a 2-D backstripping method has been applied. Subsidence analysis of cliff sections and boreholes reveal the Hampshire Basin was tectonically subsiding at a steady rate from 56.5Ma and any major periods of uplift and denudation to the present day state must have occurred from the mid Oligocene onwards. At this time the northern and western regions of the UK were believed to be uplifting as evidenced by heavy mineral transport directionns and sediment drainage patterns. A rapid increase in tectonic subsidence from 42Ma recorded by the three Isle of Wight sections in close proximity to an existing Variscan fault, thought to reactivate as a thrust during the Cenozoic, suggests a compressional stress regime in this region. The stress pattern observed from the tectonic subsidence data and evidence from drainage patterns supports a model in which the UK was uplifting in the north and west while the south east was subsiding. As this pattern is similar to the present day vertical surface motions and pre-dates glaciation, we propose glacial unloading as a

  2. Sample Return Mission to the South Pole Aitken Basin

    Science.gov (United States)

    Duke, M. B.; Clark, B. C.; Gamber, T.; Lucey, P. G.; Ryder, G.; Taylor, G. J.

    1999-01-01

    The South Pole Aitken Basin (SPA) is the largest and oldest observed feature on the Moon. Compositional and topographic data from Galileo, Clementine, and Lunar Prospector have demonstrated that SPA represents a distinctive major lunar terrane, which has not been sampled either by sample return missions (Apollo, Luna) or by lunar meteorites. The floor of SPA is characterized by mafic compositions enriched in Fe, Ti, and Th in comparison to its surroundings. This composition may represent melt rocks from the SPA event, which would be mixtures of the preexisting crust and mantle rocks. However, the Fe content is higher than expected, and the large Apollo basin, within SPA, exposes deeper material with lower iron content. Some of the Fe enrichment may represent mare and cryptomare deposits. No model adequately accounts for all of the characteristics of the SPA and disagreements are fundamental. Is mantle material exposed or contained as fragments in melt rock and breccias? If impact melt is present, did the vast sheet differentiate? Was the initial mantle and crust compositionally different from other regions of the Moon? Was the impact event somehow peculiar, (e.g., a low-velocity impact)? The precise time of formation of the SPA is unknown, being limited only by the initial differentiation of the Moon and the age of the Imbrium event, believed to be 3.9 b.y. The questions raised by the SPA can be addressed only with detailed sample analysis. Analysis of the melt rocks, fragments in breccias, and basalts of SPA can address several highly significant problems for the Moon and the history of the solar system. The time of formation of SPA, based on analysis of melt rocks formed in the event. would put limits on the period of intense bombardment of the Moon, which has been inferred by some to include a "terminal cataclysm." If close to 3.9 Ga, the presumed age of the Imbrium Basin, the SPA date would confirm the lunar cataclysm. This episode, if it occurred, would have

  3. Structural mapping based on potential field and remote sensing data, South Rewa Gondwana Basin, India

    Science.gov (United States)

    Chowdari, Swarnapriya; Singh, Bijendra; Rao, B. Nageswara; Kumar, Niraj; Singh, A. P.; Chandrasekhar, D. V.

    2017-08-01

    Intracratonic South Rewa Gondwana Basin occupies the northern part of NW-SE trending Son-Mahanadi rift basin of India. The new gravity data acquired over the northern part of the basin depicts WNW-ESE and ENE-WSW anomaly trends in the southern and northern part of the study area respectively. 3D inversion of residual gravity anomalies has brought out undulations in the basement delineating two major depressions (i) near Tihki in the north and (ii) near Shahdol in the south, which divided into two sub-basins by an ENE-WSW trending basement ridge near Sidi. Maximum depth to the basement is about 5.5 km within the northern depression. The new magnetic data acquired over the basin has brought out ENE-WSW to E-W trending short wavelength magnetic anomalies which are attributed to volcanic dykes and intrusive having remanent magnetization corresponding to upper normal and reverse polarity (29N and 29R) of the Deccan basalt magnetostratigrahy. Analysis of remote sensing and geological data also reveals the predominance of ENE-WSW structural faults. Integration of remote sensing, geological and potential field data suggest reactivation of ENE-WSW trending basement faults during Deccan volcanism through emplacement of mafic dykes and sills. Therefore, it is suggested that South Rewa Gondwana basin has witnessed post rift tectonic event due to Deccan volcanism.

  4. Anthropogenic aerosol emissions and rainfall decline in South-West Australia: coincidence or causality?

    Science.gov (United States)

    Heinzeller, Dominikus; Junkermann, Wolfgang; Kunstmann, Harald

    2017-04-01

    It is commonly understood that the observed decline in precipitation in South-West Australia during the 20th century is caused by anthropogenic factors. Candidates therefore are changes to large-scale atmospheric circulations due to global warming, extensive deforestation and anthropogenic aerosol emissions - all of which are effective on different spatial and temporal scales. This presentation focusses on the role of rapidly rising aerosol emissions from anthropogenic sources in South-West Australia around 1970. An analysis of historical longterm rainfall data of the Bureau of Meteorology shows that South-West Australia as a whole experienced a gradual decline in precipitation over the 20th century. However, on smaller scales and for the particular example of the Perth catchment area, a sudden drop in precipitation around 1970 is apparent. Modelling experiments at a convection-resolving resolution of 3.3km using the Weather and Research Forecasting (WRF) model version 3.6.1 with the aerosol-aware Thompson-Eidhammer microphysics scheme are conducted for the period 1970-1974. A comparison of four runs with different prescribed aerosol emissions and without aerosol effects demonstrates that tripling the pre-1960s atmospheric CCN and IN concentrations can suppress precipitation by 2-9%, depending on the area and the season. This suggests that a combination of all three processes is required to account for the gradual decline in rainfall seen for greater South-West Australia and for the sudden drop observed in areas along the West Coast in the 1970s: changing atmospheric circulations, deforestation and anthropogenic aerosol emissions.

  5. Petroleum systems in rift basins – a collective approach in South-east Asian basins.

    NARCIS (Netherlands)

    Doust, H.; Sumner, D.

    2007-01-01

    This paper synthesizes some of the main conclusions reached in a recent regional review of the Tertiary basins of Southeast Asia, carried out by Shell. Four distinctive types of petroleum systems, correlating with the four main stages of basin evolution (early to late syn-rift and early to late

  6. A basin on an unstable ground: Correlation of the Middle Archaean Moodies Basin, Barberton Greenstone Belt, South Africa

    Science.gov (United States)

    Ohnemueller, Frank; Heubeck, Christoph; Kirstein, Jens; Gamper, Antonia

    2010-05-01

    The 3.22 Ga-old Moodies Group, representing the uppermost part of the Barberton Supergroup of the Barberton Greenstone Belt (BGB), is the oldest well-exposed, relatively unmetamorphosed, quartz-rich sedimentary unit on Earth. Moodies facies (north of the Inyoka Fault) were thought to be largely of alluvial, fluvial, deltaic or shallow-marine origin (Anhaeusser, 1976; Eriksson, 1980; Heubeck and Lowe, 1994) and in its upper part syndeformational. However, units can only locally be correlated, and the understanding of the interplay between Moodies sedimentation and deformation is thus limited. We mapped and measured Moodies units in the northern BGB. They partly consist of extensive turbiditic deepwater deposits, including graded bedding, flame structures, and slumped beds, interbedded with jaspilites. These contrast with shallow-water environments, south-facing progressive unconformities and overlying alluvial-fan conglomerates along the northern margin of the Saddleback Syncline further south. The palaeogeographic setting in which late BGB deformation was initiated therefore appears complex and cannot be readily explained by a simple southward-directed shortening event. In order to constrain Moodies basin setting before and during late-Moodies basin collapse, we correlated ~15 measured sections in the northern and central BGB. Most units below the Moodies Lava (MdL, ca. 3230.6+-6 Ma) can be correlated throughout although facies variations are apparent. Above the Moodies Lava, coarse-grained units can only be correlated through the Eureka Syncline and the Moodies Hills Block but not with the Saddleback Syncline. Fine-grained and jaspilitic units can be correlated throughout the northern BGB. Moodies below-wavebase deposition occurred largely north of the Saddleback Fault. The observations are consistent with a pronounced basin compartmentalization event following the eruption of the MdL which appeared to have blanketed most of the Moodies basin(s) in middle Moodies

  7. Hydroclimate temporal variability in a coastal Mediterranean watershed: the Tafna basin, North-West Algeria

    Science.gov (United States)

    Boulariah, Ouafik; Longobardi, Antonia; Meddi, Mohamed

    2017-04-01

    One of the major challenges scientists, practitioners and stakeholders are nowadays involved in, is to provide the worldwide population with reliable water supplies, protecting, at the same time, the freshwater ecosystems quality and quantity. Climate and land use changes undermine the balance between water demand and water availability, causing alteration of rivers flow regime. Knowledge of hydro-climate variables temporal and spatial variability is clearly helpful to plan drought and flood hazard mitigation strategies but also to adapt them to future environmental scenarios. The present study relates to the coastal semi-arid Tafna catchment, located in the North-West of Algeria, within the Mediterranean basin. The aim is the investigation of streamflow and rainfall indices temporal variability in six sub-basins of the large catchment Tafna, attempting to relate streamflow and rainfall changes. Rainfall and streamflow time series have been preliminary tested for data quality and homogeneity, through the coupled application of two-tailed t test, Pettitt test and Cumsum tests (significance level of 0.1, 0.05 and 0.01). Subsequently maximum annual daily rainfall and streamflow and average daily annual rainfall and streamflow time series have been derived and tested for temporal variability, through the application of the Mann Kendall and Sen's test. Overall maximum annual daily streamflow time series exhibit a negative trend which is however significant for only 30% of the station. Maximum annual daily rainfall also e exhibit a negative trend which is intend significant for the 80% of the stations. In the case of average daily annual streamflow and rainfall, the tendency for decrease in time is unclear and, in both cases, appear significant for 60% of stations.

  8. Rift magmatism on the Eurasia basin margin: U–Pb baddeleyite ages of alkaline dyke swarms in North Greenland

    DEFF Research Database (Denmark)

    Thórarinsson, Sigurjón B.; Söderlund, Ulf; Døssing, Arne

    2015-01-01

    indicate that north–south and east–west dykes are coeval. The north–south dykes reflect initial east–west rifting that led to break-up along the Gakkel Ridge and formation of the Eurasia Basin. The east–west dykes reflect local variations in the stress field associated with reactivated Palaeozoic faults...

  9. A brief lithostratigraphic review of the Abrahamskraal and Koonap formations of the Beaufort Group, South Africa: Towards a basin-wide stratigraphic scheme for the Middle Permian Karoo

    Science.gov (United States)

    Day, Michael Oliver; Rubidge, Bruce Sidney

    2014-12-01

    The basal strata of the Beaufort Group of the South African Karoo Basin, comprising the western Abrahamskraal and eastern Koonap formations, contain the most time extensive record of Middle Permian fossil tetrapods and hold the key to understanding Middle Permian biodiversity change in the continental realm. To determine faunal stratigraphic ranges a reliable lithostratigraphic framework for Middle Permian Beaufort deposits is essential. Until now this has proved difficult to achieve, largely due to the homogeneity of the fluvial succession coupled with structural complexity as a result of Cape Fold Belt orogenesis. Accordingly, the Abrahamskraal Formation has been only locally subdivided on the basis of sandstone packages but regional stratigraphic subdivision has not yet achieved satisfactorily. Collation of stratigraphic sections from around the Karoo Basin for this study demonstrates the presence of four sandstone packages are present within the Abrahamskraal Formation in the south-western corner of the basin. These sandstone packages are given member status, based upon the nomenclature of Le Roux (1985) with the addition of the newly recognised Grootfontein Member. The Combrinkskraal and Grootfontein Members occur in the lower half of the Abrahamskraal Formation and are laterally persistent along the southern margin of the basin. The Koornplaats Member is more restricted to the south west corner of the basin, where it quite thick, suggesting the narrowing of the highly channelized area. The overlying Moordenaars Member, more extensive towards the north than underlying packages, indicates subsequent northwesterly expansion of the locus of active channelization with time. Although thin sandstone packages in the more easterly positioned and stratigraphically equivalent Koonap Formation, this does not facilitate lithostratigraphic subdivision of this part of the stratigraphic succession and may indicate a different form of fluvial architecture. Our study provides

  10. Characterisation of Fluorescent Biological Aerosol Particles during South-West Monsoon from a High Altitude Site in South India

    Science.gov (United States)

    Valsan, A. E.; R, R.; V, B. C.; Huffman, J. A.; Poeschl, U.; Gunthe, S. S.

    2015-12-01

    Biological aerosols (Bioaerosols) constitute a wide range of dead and alive biological materials that are suspended in the atmosphere. Though ubiquitous in earth's atmosphere, bioaerosols are poorly characterized in terms of their atmospheric abundance, sources and physical properties. Here we discuss the number concentration and size distribution of coarse mode (>1µm) biological aerosols measured at a relatively clean high altitude continental site, Munnar (10.09 N, 77.06 E; 1605 m asl) located in the Western Ghats mountain ranges of Southern Tropical India. The fluorescent biological aerosol particles (FBAP) were continuously measured using Ultra Violet Aerodynamic Particle Sizer (UVAPS) from 01 June to 21 August 2014 (South-West Monsoon Period) which showed some interesting patterns. The mean number and mass concentration of coarse FBAP during the campaign was observed to be 1.7 x 10-2cm-3 and 0.24µg m-3 respectively, which corresponds to 2% and 9% of coarse total aerosol particles (TAP) number and mass concentration. FBAP concentration decreased significantly during periods of heavy and continuous rain with constant South-West winds. This may be due to the clean marine influx coming from the ocean and continuous washout. The Relative Humidity (RH) and temperature remained consistent during this period without any strong diurnal pattern. When the wind fluctuated in North-West directions, the FBAP concentration increased to even an order of magnitude higher than the periods of South-West winds which can be attributed to the transported bioaerosols from the nearby vegetated area. In spite of variability in the number concentrations, the size distribution of FBAP exhibited a prominent peak at ~3 μm throughout the campaign, which should be fungal spores. They also exhibited a strong diurnal pattern with high concentrations occuring during the night time which peaks in the early morning hours.Biological aerosols (Bioaerosols) constitute a wide range of dead and

  11. Study Of The West Gondwana Floras During The Late Paleozoic: A Paleogeographic Approach In The Parana Basin - Brazil

    OpenAIRE

    Christiano-de-Souza; Isabel Cortez; Ricardi-Branco; Fresia Soledad

    2016-01-01

    The Late Paleozoic in West Gondwana was a period of significant climatic changes, ranging from a glacial climate in the Late Carboniferous to a semi-arid climate in the Late Permian. The Floristic Province of Gondwana in the Parana Basin was directly affected by such changes, and underwent a transformation regarding composition and geographic distribution. Thus, the climatic phases were divided into three intervals: Phase A containing interglacially developed flora; Phase B, containing floras...

  12. Deep Crustal Seismic Reflection Experiment Across the Sothern Karoo Basin, South Africa

    OpenAIRE

    A. S. Lindeque; Trond Ryberg; Jacek Stankiewicz; Michael Weber; M. J. de Wit

    2007-01-01

    A controlled source Near Vertical Reflection (NVR) Seismic experiment along a ~ 100 km profile yields the first high quality seismic image of the crust and Moho across the southern Karoo Basin in South Africa. The highly reflective crust comprises upper, middle and lower layers. In the upper crust, folded and gently south-dipping continuous reflectors up to the Escarpment, represent the bedding of the Karoo and Cape Supergroups respectively. Décollement structures occur locally along carbona...

  13. Intercomparison of Evapotranspiration Over the Savannah Volta Basin in West Africa Using Remote Sensing Data.

    Science.gov (United States)

    Opoku-Duah, S; Donoghue, D N M; Burt, T P

    2008-04-17

    This paper compares evapotranspiration estimates from two complementary satellite sensors - NASA's Moderate Resolution Imaging Spectroradiometer (MODIS) and ESA's ENVISAT Advanced Along-Track Scanning Radiometer (AATSR) over the savannah area of the Volta basin in West Africa. This was achieved through solving for evapotranspiration on the basis of the regional energy balance equation, which was computationally-driven by the Surface Energy Balance Algorithm for Land algorithm (SEBAL). The results showed that both sensors are potentially good sources of evapotranspiration estimates over large heterogeneous landscapes. The MODIS sensor measured daily evapotranspiration reasonably well with a strong spatial correlation (R²=0.71) with Landsat ETM+ but underperformed with deviations up to ~2.0 mm day -1 , when compared with local eddy correlation observations and the Penman-Monteith method mainly because of scale mismatch. The AATSR sensor produced much poorer correlations (R²=0.13) with Landsat ETM+ and conventional ET methods also because of differences in atmospheric correction and sensor calibration over land.

  14. Intercomparison of Evapotranspiration Over the Savannah Volta Basin in West Africa Using Remote Sensing Data

    Directory of Open Access Journals (Sweden)

    T. P. Burt

    2008-04-01

    Full Text Available This paper compares evapotranspiration estimates from two complementary satellite sensors – NASA’s Moderate Resolution Imaging Spectroradiometer (MODIS and ESA’s ENVISAT Advanced Along-Track Scanning Radiometer (AATSR over the savannah area of the Volta basin in West Africa. This was achieved through solving for evapotranspiration on the basis of the regional energy balance equation, which was computationally-driven by the Surface Energy Balance Algorithm for Land algorithm (SEBAL. The results showed that both sensors are potentially good sources of evapotranspiration estimates over large heterogeneous landscapes. The MODIS sensor measured daily evapotranspiration reasonably well with a strong spatial correlation (R2=0.71 with Landsat ETM+ but underperformed with deviations up to ~2.0 mm day-1, when compared with local eddy correlation observations and the Penman-Monteith method mainly because of scale mismatch. The AATSR sensor produced much poorer correlations (R2=0.13 with Landsat ETM+ and conventional ET methods also because of differences in atmospheric correction and sensor calibration over land.

  15. West Siberian basin hydrogeology - regional framework for contaminant migration from injected wastes

    Energy Technology Data Exchange (ETDEWEB)

    Foley, M.G.

    1994-05-01

    Nuclear fuel cycle activities of the former Soviet Union (FSU) have resulted in massive contamination of the environment in western Siberia. We are developing three-dimensional numerical models of the hydrogeology and potential contaminant migration in the West Siberian Basin. Our long-term goal at Pacific Northwest Laboratory is to help determine future environmental and human impacts given the releases that have occurred to date and the current waste management practices. In FY 1993, our objectives were to (1) refine and implement the hydrogeologic conceptual models of the regional hydrogeology of western Siberia developed in FY 1992 and develop the detailed, spatially registered digital geologic and hydrologic databases to test them, (2) calibrate the computer implementation of the conceptual models developed in FY 1992, and (3) develop general geologic and hydrologic information and preliminary hydrogeologic conceptual models relevant to the more detailed models of contaminated site hydrogeology. Calibration studies of the regional hydrogeologic computer model suggest that most precipitation entering the ground-water system moves in the near-surface part of the system and discharges to surface waters relatively near its point of infiltration. This means that wastes discharged to the surface and near-surface may not be isolated as well as previously thought, since the wastes may be carried to the surface by gradually rising ground waters.

  16. Saghro Group in the Ougnat Massif (Morocco), an evidence for a continuous Cadomian basin along the northern West African Craton

    Science.gov (United States)

    Michard, André; Soulaimani, Abderrahmane; Ouanaimi, Hassan; Raddi, Youssef; Aït Brahim, Lahsen; Rjimati, Ech-Cherki; Baidder, Lahssen; Saddiqi, Omar

    2017-03-01

    The Saghro Group (SG) is a folded, low-grade volcano-sedimentary series up to 8 km thick that crops out within and to the north of the Pan-African suture zone in the central and eastern Anti-Atlas. Here we describe the SG of the Ougnat inliers that are exposed in the easternmost Anti-Atlas beneath the unconformable, Late Ediacaran Ouarzazate Group (OZG) volcanic rocks. The Ougnat SG mostly consists of volcaniclastic greywackes accumulated in a peritidal-to-shallow basin. The basin infilling was deformed by NNE-trending, mostly upright folds with axial-planar slaty cleavage and low-grade metamorphism. The deformed SG rocks were intruded by the ∼550 Ma Mellab hypovolcanic granodiorite. The latter also crosscuts the lowest OZG rocks that are dated to 574-571 Ma in the western Saghro region. The SG rocks that form the Siroua and Saghro inliers have an oldest age of 620-610 Ma and were folded at ∼610-580 Ma at the onset of the Cadomian orogenic events. We show that the SG rocks are similar to the ;Série verte; (SV) rocks that are exposed in the Ougarta and western Hoggar east of the Pan-African suture. We infer that the SG and SV rocks accumulated in a same, continuous basin that was bounding the West African Craton to the north and the east. This strongly subsiding basin formed close to a volcanic arc and was folded during the last Pan-African synmetamorphic events. Fold orientation and age of folding differ however along the edge of the West African Craton. The orogenic greywackes that form the remnants of the SG-SV basin thus constitute a precious record of the diachronic Cadomian event s.l. along the West African Craton northern margin.

  17. Geophysical evidence of Cretaceous volcanics in Logone Birni Basin (Northern Cameroon), Central Africa, and consequences for the West and Central African Rift System

    Science.gov (United States)

    Loule, Jean-Pierre; Pospisil, Lubomil

    2013-01-01

    Detailed analyses and interpretation realized by combining existing 2D reflection seismic and Gravity/Magnetic data of the Logone Birni Basin (LBB) in the West and Central African Rift System (WCAS) have revealed the distribution of the main buried volcanic bodies as well as their relationships with the structural and tectonic evolution of this basin. The volcanic activity in the LBB is restricted to the Cretaceous period. Three main volcanic episodes are identified and are associated to the Neocomian, Late Albian and Cenomanian-Turonian rifting phases respectively. The volcanic bodies within the Lower Cretaceous are either lying directly on basement or are mainly interbedded with the contemporaneous sediments whereas the Upper Cretaceous bodies are morphologically expressed in the forms of dykes and sills. The volcanic activity was more intense in the western region of the central LBB (Zina sub-basin) along the Cameroon-Nigeria border whereas it was scanty and scattered in the other parts of the basin. The main volcanic dykes are found on the flanks of the major faults bounding basement horsts or in crestal positions in association with syndepositional faults. Although WCAS is associated with large amount of crustal extension and minor volcanism, the intense volcanic activity observed in LBB during the Cretaceous suggests that the intrusive zone during this period was confined to the basement beneath the study area flanked respectively to the north, south and southwest by the Lake Chad, Poli and Chum triple junctions. Tensional stresses generated by this localized domal uplift accounts for most of the observed tectonic structures where major faults transected the entire lithosphere, thus providing conduits for magma migration.

  18. SOCIAL RESPONSIBILITY - A VIABLE INSTRUMENT FOR SUSTAINABLE DEVELOPMENT OF THE TOURISM INDUSTRY IN SOUTH WEST OLTENIA

    Directory of Open Access Journals (Sweden)

    POPA OANA

    2012-06-01

    Full Text Available The paper emphasizes the need for the tourism sector to adopt a policy of social responsibility for building sustainable development, necessary for the socio-economic recovery of Romania. The study includes a sample of 68 hotels in the five counties of South West Oltenia Region. Data for the research was collected by accessing the official websites for each hotel in order to analyze the degree of implementation of social responsibility on the basis of ten variables, required to achieve a sustainable tourism. The findings reveal a lack of transparency and involvement in social responsibility of the hotel industry in South West Oltenia. Research has shown that accomodation and tourism sector in the region analyzed is far from reaching the international standards, so the adoption of recommendations on best practices would be an important step forward for enhancing sustainable tourism in Romania.

  19. OPPORTUNITIES FOR ECONOMIC DEVELOPMENT RELATIVE TO THE SPECIFIC OF SOUTH WEST OLTENIA REGION OF DEVELOPMENT

    Directory of Open Access Journals (Sweden)

    Ciobanu Dumitru

    2013-06-01

    Full Text Available For a healthy economic development is needed to use in a most efficient way the existing natural resources.In this sense, we present some opportunities for economic development of the South-West Oltenia region suggested bythe particularities of this area. We put emphasis on agriculture and tourism because here we identified the greatestpotential for development. Opportunities in agriculture are justified by the existence of large agricultural areas thatare not cultivated and those that are made in an inefficient way. In these cases, an increase in productivity can beachieved by the creation of holdings of large and very large dimensions. Also, the creation of technological chains totransform agricultural products into finished products can rise the number of employees and increase profits. In termsof a usability for about 30% of accommodation in the South West Oltenia development region and a wide range oftourist attractions in the area, the potential for growth in tourism is considerable.

  20. Late Quaternary stratigraphy, sedimentology, and geochemistry of an underfilled lake basin in the Puna (north-west Argentina)

    Science.gov (United States)

    McGlue, Michael M.; Cohen, Andrew S.; Ellis, Geoffrey S.; Kowler, Andrew L.

    2013-01-01

    Depositional models of ancient lakes in thin-skinned retroarc foreland basins rarely benefit from appropriate Quaternary analogues. To address this, we present new stratigraphic, sedimentological and geochemical analyses of four radiocarbon-dated sediment cores from the Pozuelos Basin (PB; northwest Argentina) that capture the evolution of this low-accommodation Puna basin over the past ca. 43 cal kyr. Strata from the PB are interpreted as accumulations of a highly variable, underfilled lake system represented by lake-plain/littoral, profundal, palustrine, saline lake and playa facies associations. The vertical stacking of facies is asymmetric, with transgressive and thin organic-rich highstand deposits underlying thicker, organic-poor regressive deposits. The major controls on depositional architecture and basin palaeogeography are tectonics and climate. Accommodation space was derived from piggyback basin-forming flexural subsidence and Miocene-Quaternary normal faulting associated with incorporation of the basin into the Andean hinterland. Sediment and water supply was modulated by variability in the South American summer monsoon, and perennial lake deposits correlate in time with several well-known late Pleistocene wet periods on the Altiplano/Puna plateau. Our results shed new light on lake expansion–contraction dynamics in the PB in particular and provide a deeper understanding of Puna basin lakes in general.

  1. The punctuation in the evolution of orbitoides in the campanian of South-West France

    OpenAIRE

    Drooger, C.W.; Klerk, J.C. de

    1985-01-01

    For the Orbitoides assemblages analyzed from a number of closely sampled sections of Campanian calcarenites in south-west France there is a sudden change in the means of several parameters of the internal embryonicnepionic stage. The direction of the change is in accordance with the nepionic acceleration principle, known to be valid for all lineages of orbitoidallarger foraminifera. Below and above the level of the morphological break we seem to be dealing with two longer periods without any ...

  2. Home range and diving behaviour of Heaviside's dolphins monitored by satellite off the west coast of South Africa

    National Research Council Canada - National Science Library

    Davis, RW; David, JHM; Meÿer, MA; Sekiguchi, K; Best, PB; Dassis, M; Rodríguez, DH

    2014-01-01

    Three Heaviside's dolphins Cephalorhynchus heavisidii were fitted with satellite depth recorders off the west coast of South Africa during February-April 1997 and monitored for 51, 73 and 130 days, respectively...

  3. Informing comprehensive HIV prevention: a situational analysis of the HIV prevention and care context, North West Province South Africa

    National Research Council Canada - National Science Library

    Lippman, Sheri A; Treves-Kagan, Sarah; Gilvydis, Jennifer M; Naidoo, Evasen; Khumalo-Sakutukwa, Gertrude; Darbes, Lynae; Raphela, Elsie; Ntswane, Lebogang; Barnhart, Scott

    2014-01-01

    ..., and the available community resources. We carried out a situational analysis in order to shape a comprehensive HIV prevention program that address local barriers to care at multiple contextual levels in the North West Province of South Africa...

  4. basin in obafemi awolowo university, ile-ife, south western

    African Journals Online (AJOL)

    2004-08-28

    Aug 28, 2004 ... Printing Press, Ibadan. 106pp. Ogunkoya, O.O., 1980. Hydrology of 3" order basins in the upper Owena drainage basing of southwestern. Nigeria. Unpublished Ph.D. Thesis, Department of. Geography, University of Ife, lle-Ife, Nigeria. pp. 65-. 72. Oluwatimilehin, J.M., 1990. Scdiment dynamics in some 3".

  5. Pre-Laramide tectonics - possible control on locus of Turonian-Coniacian parallic Coal Basins, west-central New Mexico

    Energy Technology Data Exchange (ETDEWEB)

    Stricker, G.D.; Anderson, O.J.

    1985-05-01

    Published evidence indicates that Late Cretaceous shorelines trended northwest through west-central New Mexico and adjacent Arizona. Our investigations delineate these shorelines through time and relate them to the prominent northwest-trending monoclinal flexures in the Zuni and southwestern San Juan basins. We related the transgressive (T)-regressive (R) marine cycles (T2-R2, T3-R3, T4-R4) of C.M. Molenaar to deep-rooted monoclinal or asymmetric anticlinal structures. The T2-R2 turn-around is coincident with the Pinon Springs anticline in the northern part of the Zuni basin and appears to be controlled by the Atarque and Gallestina monoclines in the southern part of this basin. Shoreline configurations during the T3 and T4 transgressive maximums coincide with the axis of the Nutria monocline and relate to some subtle pre-Laramide movements along this structure. The R2 regression is unique to New Mexico, suggesting local tectonic control on the configuration of the seaway. The subsequent T3 transgression, which was a major widespread event elsewhere in the Western Interior, was abbreviated in west-central New Mexico near the location of the Nutria monocline. The T2-R2 through T4-R4 shoreline turnarounds produced numerous parallic basins favorable for the accumulation of organic detritus. A turn-around probably represents a period of slow rates of shoreline migration which allowed a thicker, more extensive accumulation of plant material and hence thicker coals. The present and most of the past coal production in the Zuni and southwestern San Juan basins is from coals formed in parallic basins just landward of the turnarounds caused by pre-Laramide tectonics.

  6. Activity of convective tropical gravity-waves above the south west indian ocean

    Science.gov (United States)

    Evan, S.; Chane-Ming, F.; Keckhut, P.

    Tropical gravity waves play an important role in the dynamics of the middle atmosphere Such small-scale waves can transport energy and momentum vertically as well as horizontally from the troposphere to the middle and upper atmosphere affecting the global circulation Recent studies have focused on the characterization of gravity-waves from local and global observation to improve numerical modelling in terms of parameterisation and comparison for more realistic outputs Many studies have used high-resolution radiosoundings but first climatologies concern continental regions such as Australia and the US Allen and Vincent 1995 Wang and Geller 2003 In the tropics and over ocean and especially in the South-West Indian Ocean measurements are scarce and little is known about the activity of the gravity-waves except using satellite data for large-scale gravity waves above the lower stratosphere In this study a climatology and spatial distribution of the gravity-wave activity for the South West Indian Ocean is produced The dataset includes measurements of daily soundings in the South-West Indian Ocean located between 4oS-30oS and 30oE-56oE Waves parameters energy spatial and temporal scales of waves direction of horizontal wave propagation are analyzed from January 1998 to November 2005 in the troposphere and lower stratosphere A daily activity and wave sources tropical cyclones QBO convection are also investigated

  7. West Nile virus circulation in South-Eastern Romania, 2011 to 2013.

    Science.gov (United States)

    Dinu, S; Cotar, A I; Pănculescu-Gătej, I R; Fălcuţă, E; Prioteasa, F L; Sîrbu, A; Oprişan, G; Bădescu, D; Reiter, P; Ceianu, C S

    2015-05-21

    Lineage 2 West Nile virus (WNV), previously found only in sub-Saharan Africa and Madagascar, was identified in Hungary in 2004 and has rapidly expanded in Europe in the past decade. Following a significant outbreak of West Nile fever with neurological cases caused by lineage 1 WNV in Romania in 1996, scattered cases have been recorded in the south-east of the country in each transmission season. Another outbreak, affecting a larger area and caused by lineage 2 WNV, was recorded in 2010. We analysed human sera from neuroinvasive West Nile fever cases and mosquitoes, sampled in south-eastern Romania between 2011 and 2013, for the presence of WNV genome, and obtained partial NS5 and envelope glycoprotein sequences. Human- and mosquito-derived WNV sequences were highly similar (99%) to Volgograd 2007 lineage 2 WNV and differed from isolates previously detected in central and southern Europe. WNV was detected in one pool of Culex pipiens s.l. males, documenting vertical transmission. Lineage 4 WNV, of unknown pathogenicity to mammals, was found in the amphibian-feeding mosquito Uranotaenia unguiculata from the Danube Delta. Our results present molecular evidence for the maintenance of the same isolates of Volgograd 2007-like lineage 2 WNV in south-eastern Romania between 2011 and 2013.

  8. Assessment of continuous oil and gas resources of the South Sumatra Basin Province, Indonesia, 2016

    Science.gov (United States)

    Schenk, Christopher J.; Tennyson, Marilyn E.; Klett, Timothy R.; Finn, Thomas M.; Mercier, Tracey J.; Gaswirth, Stephanie B.; Marra, Kristen R.; Le, Phuong A.; Hawkins, Sarah J.

    2016-12-09

    Using a geology-based assessment methodology, the U.S. Geological Survey estimated undiscovered, technically recoverable mean resources of 689 million barrels of continuous shale oil and 3.9 trillion cubic feet of shale gas in the South Sumatra Basin Province in Indonesia.

  9. Redbed-type gold mineralisation, Kupferschiefer, south-west Poland

    Science.gov (United States)

    Piestrzyński, Adam; Pieczonka, Jadwiga; Głuszek, Adam

    2002-06-01

    A new type of gold mineralisation containing minor amounts of platinum and palladium has been found proximal to the secondary redox interface located below the Cu-Ag Kupferschiefer orebody of the Polkowice-Sieroszowice mine in the south-western part of the Lubin-Sieroszowice district, Poland. This deposit can be classified as redbed-type gold. Our study shows that gold, platinum and palladium occur in secondary red-coloured sections of the basal Zechstein sedimentary rocks and in the uppermost Weissliegendes sandstone. Noble metal mineralisation occurs within an average interval of 0.22 m, which lies directly below the copper ores. The average grade of the horizon is 2.25 ppm Au, 0.138 ppm Pt and 0.082 ppm Pd with a metal content of several tens of tonnes of gold. A transition zone has been recognised between the gold-bearing horizon and the copper deposit. This transition zone is characterised by the presence of low grades of copper (0.5 ppm). Native gold accompanied by electrum, mercury-bearing gold, haematite, covellite, chalcocite, bornite and chalcopyrite has been identified in the gold-bearing horizon. In some sections, Pd-arsenides, tetra-auricupride, Co-arsenides, clausthalite, tennantite, digenite, yarrowite, spionkopite and galena have also been noted.

  10. Modelling the effects of climate and land cover change on groundwater recharge in south-west Western Australia

    OpenAIRE

    W. Dawes; Ali, R.; Varma, S.; I. Emelyanova; Hodgson, G; Mcfarlane, D

    2012-01-01

    The groundwater resource contained within the sandy aquifers of the Swan Coastal Plain, south west Western Australia, provides approximately 60% of the drinking water for the metropolitan population of Perth. Rainfall decline over the past three decades coupled with increasing water demand from a growing population has resulted in falling dam storage and groundwater levels. Projected future changes in climate across south-west Western Australia consistently show a decline in annual rai...

  11. Modelling the effects of climate and land cover change on groundwater recharge in south-west Western Australia

    OpenAIRE

    W. Dawes; Ali, R.; Varma, S.; I. Emelyanova; Hodgson, G; Mcfarlane, D

    2012-01-01

    The groundwater resource contained within the sandy aquifers of the Swan Coastal Plain, south-west Western Australia, provides approximately 60 percent of the drinking water for the metropolitan population of Perth. Rainfall decline over the past three decades coupled with increasing water demand from a growing population has resulted in falling dam storage and groundwater levels. Projected future changes in climate across south-west Western Australia consistently show a decline in annual rai...

  12. Expansion of the South China Sea basin: Constraints from magnetic anomaly stripes, sea floor topography, satellite gravity and submarine geothermics

    Directory of Open Access Journals (Sweden)

    Xuezhong Yu

    2017-01-01

    Full Text Available The widely distributed E–W-trending magnetic anomaly stripes in the central basin and the N–E-trending magnetic anomaly stripes in the southwest sub-basin provide the most important evidence for Neogene expansion of the South China Sea. The expansion mechanism remains, however, controversial because of the lack of direct drilling data, non-systematic marine magnetic survey data, and irregular magnetic anomaly stripes with two obvious directions. For example, researchers have inferred different ages and episodes of expansion for the central basin and southwest sub-basin. Major controversy centers on the order of basinal expansion and the mechanism of expansion for the entire South China Sea basin. This study attempts to constrain these problems from a comprehensive analysis of the seafloor topography, magnetic anomaly stripes, regional aeromagnetic data, satellite gravity, and submarine geothermics. The mapped seafloor terrain shows that the central basin is a north-south rectangle that is relatively shallow with many seamounts, whereas the southwest sub-basin is wide in northeast, gradually narrows to the southwest, and is relatively deeper with fewer seamounts. Many magnetic anomaly stripes are present in the central basin with variable dimensions and directions that are dominantly EW-trending, followed by the NE-, NW- and NS-trending. Conversely such stripes are few in the southwest sub-basin and mainly NE-trending. Regional magnetic data suggest that the NW-trending Ailaoshan-Red River fault extends into the South China Sea, links with the central fault zone in the South China Sea, which extends further southward to Reed Tablemount. Satellite gravity data show that both the central basin and southwest sub-basin are composed of oceanic crust. The Changlong seamount is particularly visible in the southwest sub-basin and extends eastward to the Zhenbei seamount. Also a low gravity anomaly zone coincides with the central fault zone in the sub-basin

  13. Modeling glacier mass balance and runoff in the Koxkar river basin on the south slope of the Tianshan Mountains, China, from 1959 to 2009

    Science.gov (United States)

    Xu, M.; Han, H.; Kang, S.

    2016-12-01

    Water resources provided by alpine glaciers are an important pillar for people living in the arid regions in the west of China. In this study, the HBV (Hydrologiska Byrans Vattenavdelning) model was applied to simulate glacier mass balance and runoff in the Koxkar river basin on the south slope of Mt. Tumur, western Tianshan Mountains. Daily temperature and precipitation were calculated by multiple linear regressions and gradient-inverse distance weighting, respectively, based on in-situ observed data by automatic weather stations (AWSs) in the basin (2007-2009) and at four meteorological stations neighbering the basin (1959-2009). In-situ observed daily data for 3-year air temperature and precipitation was input data for HBV. The model was calibrated by runoff in 2007/08 and 2009/10, and validated by runoff in 2008/09 and 2010/11. Generally, the model could simulate runoff very well. Thus, the annual glacier mass balance and runoff were calculated using the HBV model driven by interpolated meteorological data for the period of 1959-2009. The simulated glacier mass balance were reasonable when compared with those observed values at nearby glaciers, indicating a decrease trend of mass balance in the basin with an average value of -370.4 mm a-1 since 1959. The annual runoff showed a slight increase trend (5.51 mm a-1). Futher analysis indicated that the runoff is more sensitive to temperature than precipitation amuont in the Koxkar river basin.

  14. Application of advanced reservoir characterization, simulation, and production optimization strategies to maximize recovery in slope and basin clastic reservoirs, West Texas (Delaware Basin), Class III

    Energy Technology Data Exchange (ETDEWEB)

    Dutton, Shirley P.; Flanders, William A.; Zirczy, Helena H.

    2000-05-24

    The objective of this Class 3 project was to demonstrate that detailed reservoir characterization of slope and basin clastic reservoirs in sandstones of the Delaware Mountain Group in the Delaware Basin of West Texas and New Mexico is a cost effective way to recover a higher percentage of the original oil in place through strategic placement of infill wells and geologically based field development. Phase 1 of the project, reservoir characterization, was completed this year, and Phase 2 began. The project is focused on East Ford field, a representative Delaware Mountain Group field that produces from the upper Bell Canyon Formation (Ramsey sandstone). The field, discovered in 1960, is operated by Oral Petco, Inc., as the East Ford unit. A CO{sub 2} flood is being conducted in the unit, and this flood is the Phase 2 demonstration for the project.

  15. Nature and tectonic implications of uneven sedimentary filling of the South China Sea oceanic basin

    Science.gov (United States)

    Yin, Shaoru; Li, Jiabiao; Ding, Weiwei; Fang, Yinxia

    2017-04-01

    The IODP Expedition 349 in 2014, for the first time, illustrated significant differences of sediment rate and lithology in the central South China Sea (SCS) oceanic basin. Based on seismic reflection profiles tied to IODP349 drilling data, we investigated characteristics of sedimentary filling of the whole SCS oceanic basin, and examined their implications for tectonics. Results show that sediments fill the SCS oceanic basin mainly in three depositional patterns. Firstly, during the Oligocene to middle Miocene, sediments amassed almost solely and then connected like a band parallel to the continent in a low average sediment rate (tectonics, including the two-phase rapid uplift of the Tibetan Plateau, the Pliocene to Quaternary increased northwestward movement of the Philippine Sea plate and Dongsha event. This study exhibits hitherto most completed observation of sedimentary filling of the SCS oceanic basin and provides new geophysical evidences for the local and regional important tectonics.

  16. New Crater Counts of the South Pole-Aitken Basin

    Science.gov (United States)

    Hiesinger, H.; van der Bogert, C. H.; Pasckert, J. H.; Schmedemann, N.; Robinson, M. S.; Jolliff, B.; Petro, N.

    2012-04-01

    Lunar Reconnaissance Orbiter Camera (LROC) images allow us to perform detailed crater size-frequency distribution (CSFD) measurements of the SPA basin to derive absolute model ages of the basin itself as well as several superposed impact structures. The SPA basin is of interest because (1) it might have penetrated the entire lunar crust and exposed lower crustal or upper mantle material, (2) it did not reveal KREEP-rich rocks in contrast with the Imbrium basin, and (3) its age will shed light on the plausibility of a terminal cataclysm [e.g., 1]. Such a cataclysm was proposed to explain the large number of ~3.9 Ga impact ages of the Apollo and Luna samples [e.g., 2]. Provided the age of the SPA basin is close to 4 Ga, this would support the lunar cataclysm hypothesis [3]. Our CSFD measurements indicate that the SPA basin is ~4.26 (±0.03) Ga old (N(1)=3.70x10-1), similar to the ages of ancient samples from the Apollo 16 and 17 landing sites, and the farside meteorites Dhofar 489 and Yamato 86032, which were interpreted to indicate the formation of the SPA basin at 4.23 Ga [4]. We also find that the craters Planck and Oppenheimer formed about the same time as each other, i.e., ~4.09 (+0.02/-0.03; N(1)=1.11x10-1) and ~4.04 Ga (±0.01; N(1)=8.43x10-2) ago. Schrödinger is younger with absolute model age of ~3.92 Ga (±0.02; N(1)=3.74x10-2). Both Planck and Schrödinger are characterized by underlying older surface ages of 4.26 (+0.07/-0.18; N(1)=3.70x10-1) Ga and 4.19 Ga (+0.08/-0.24; N(1)=2.26x10-1), which is close to the age of SPA. We conclude that (1) SPA is significantly older than 4 Ga; (2) this age is consistent with radiometric ages of Apollo 16 and 17 samples, as well as lunar farside meteorites, (3) the absolute model age of SPA is too old for a sharply spiked lunar cataclysm at 3.9-4.0 Ga; (4) some of the younger impacts such as Schrödinger and Planck only incompletely resurfaced the SPA basin as they exhibit underlying older ages that are similar to the

  17. Post-breakup Basin Evolution along the South-Atlantic Margins in Brazil and Angola/Namibia

    Science.gov (United States)

    Kukla, P. A.; Strozyk, F.; Back, S.

    2013-12-01

    The post-breakup tectono-stratigraphic evolution of large offshore basins along the South American and African continental margins record strongly varying post-rift sedimentary successions. The northernmost segment of the South Atlantic rift and salt basins is characterized by a pronounced asymmetry, with the Brazilian margin comprising narrower and deeper rift basins with less salt in comparison to the Congo-Gabon conjugate margin. Another important observation is that multiple phases of uplift and subsidence are recorded after the break-up of the southern South Atlantic on both sides of the Florianopolis-Walvis Ridge volcanic complex, features that are regarded as atypical when compared to published examples of other post-breakup margin successions. A regional comparison based on tectonic-stratigraphic analysis of selected seismic transects between the large basins offshore southern Brazil (Espirito Santo Basin, Campos Basin, Santos Basin, Pelotas Basin) and southwest Africa (Lower Congo Basin, Kwanza Basin, Namibe Basin, Walvis Basin) provides a comprehensive basin-to-basin documentation of the key geological parameters controlling ocean and continental margin development. This comparison includes the margin configuration, subsidence development through time, sediment influx and storage patterns, type of basin fill (e.g. salt vs. non-salt systems; carbonate-rich vs. clastics-dominated systems) and finally major tectonic and magmatic events. Data from the salt basins indicate that salt-related tectonic deformation is amongst the prime controls for the non-uniform post-rift margin development. The diversity in the stratigraphic architecture of the conjugate margins offshore southern Brazil, Namibia and Angola reflects variations in the interplay of a number of controlling factors, of which the most important are (a) the structural configuration of each margin segment at the time of break-up, (b) the post break-up subsidence history of the respective margin segment

  18. Waterford Formation in the south-eastern Karoo: Implications for basin development

    Directory of Open Access Journals (Sweden)

    Richard Mason

    2012-03-01

    Full Text Available Extensive research on the rocks of the Karoo Supergroup has shown that this sequence, which contains an unsurpassed record of Permian–Jurassic tetrapods, records a largely unbroken stratigraphic succession from 300 Ma to 180 Ma. This Gondwanan succession was deposited in a changing environmental setting reflecting glacial marine through deltaic to fluvial and aeolian desert conditions. The contact between the Ecca and Beaufort Groups (at the top of the Waterford Formation of the Ecca Group in the southern and western Karoo represents a change in depositional environment from a subaqueous to a subaerial delta plain. By contrast, the Waterford Formation has not yet been recognised in the south-eastern Karoo Basin, which might imply that a major unconformity is present between the Fort Brown Formation of the Ecca Group, deposited in a prodelta environment, and the overlying fluvially deposited Koonap Formation of the Beaufort Group. From careful documentation of lithofacies and sedimentological data, it can be demonstrated that the Waterford Formation is indeed present in the south-eastern part of the basin and that no major unconformity is present – a fact that has implications for the mapping of Karoo rocks in the Eastern Cape Province of South Africa, for understanding the depositional environment of ’reptilian‘ fossils from the lowermost Beaufort in this part of the Karoo basin, and for basin development models.

  19. Streamflow gain and loss and water quality in the upper Nueces River Basin, south-central Texas, 2008-10

    Science.gov (United States)

    Banta, J. Ryan; Lambert, Rebecca B.; Slattery, Richard N.; Ockerman, Darwin J.

    2012-01-01

    The U.S. Geological Survey-in cooperation with the U.S. Army Corps of Engineers, The Nature Conservancy, the Real Edwards Conservation and Reclamation District, and the Texas Parks and Wildlife Department-investigated streamflow gain and loss and water quality in the upper Nueces River Basin, south-central Texas, specifically in the watersheds of the West Nueces, Nueces, Dry Frio, Frio, and Sabinal Rivers upstream from the Edwards aquifer outcrop. Streamflow in these rivers is sustained by groundwater contributions (for example, from springs) and storm runoff from rainfall events. To date (2012), there are few data available that describe streamflow and water-quality conditions of the rivers within the upper Nueces River Basin. This report describes streamflow gain-loss characteristics from three reconnaissance-level synoptic measurement surveys (hereinafter referred to as "surveys") during 2008-10 in the upper Nueces River Basin. To help characterize the hydrology, groundwater-level measurements were made, and water-quality samples were collected from both surface-water and groundwater sites in the study area from two surveys during 2009-10. The hydrologic (streamflow, springflow, and groundwater) measurements were made during three reconnaissance-level synoptic measurement surveys occurring in July 21-23, 2008; August 8-18, 2009; and March 22-24, 2010. These survey periods were selected to represent different hydrologic conditions. Streamflow gains and losses were based on streamflow and springflow measurements made at 74 sites in the study area, although not all sites were measured during each survey. Possible water chemistry relations among sample types (streamflow, springflow, or groundwater), between surveys, and among watersheds were examined using water-quality samples collected from as many as 20 sites in the study area.

  20. Petrophysical Evaluation of the Sarvak Formation Based on Well Logs in Dezful Embayment, Zagros Fold Zone, South West of Iran

    Directory of Open Access Journals (Sweden)

    A. Jooybari

    2017-02-01

    Full Text Available Dezful embayment in the south west of Iran is part of Zagros fold zone which despite the small area includes almost all of Iran oil production. Sarvak Formation with middle cretaceous (Albin-Turunin is the second biggest reservoir of Zagros basin, after the Asmari formation. In this study, with well logging data of two wells, by Geolog software, the petrophysical parameters of Sarvak Formation in the Dezful embayment was studied using the contingent Probabilistic method. Petrophysical parameters such as determination of porosity, water saturation, shale volume and lithology were calculated using this data and common cross plots. Based on this evaluation and utilizing cross plots result, the lithology of Sarvak formation in this zone was determined to be Limestone with traces of dolomite and shale. According to the calculated petrophysical properties of the reservoir, and for more accurate assessment, Sarvak Formation was divided to 6 sections. Findings of this research show that Sarvak Formation includes good reservoir parameters only in half its sections (sections 4, 2 and 6.

  1. Impacts of terrain attributes and human activities on soil texture class variations in hilly areas, south-west China.

    Science.gov (United States)

    Li, Ai-Di; Guo, Peng-Tao; Wu, Wei; Liu, Hong-Bin

    2017-06-01

    Knowledge of soil texture variations is critical for agricultural and engineering applications because texture influences many other soil properties. This study used random forest method to evaluate the effects of human activities and topographic parameters on the spatial variability of soil texture in hilly areas where soil parent material was uniform. The study site covers 252 km 2 and is located in the Upper Yangtze River Basin of south-west China. A total of 3636 samples were collected from the cultivated soils at a depth of 20 cm of dryland (sloping field and terraced land) landscape. The soil texture class for each sample was estimated by experienced soil scientists in the field. Two soil texture classes (loam and clay) were observed in the watershed. Eleven terrain parameters were derived from a digital elevation model with a resolution of 30 m. Compared with loamy soils, clayey soils were mostly observed in the areas with lower elevation and gentle slopes. The outcome of random forest indicated that human activities and elevation had strong effects on soil texture class variations across the study site. Further results showed that the relative importance of terrain parameters to soil texture class variations varied with dryland landscape. Topographic wetness index and elevation were the most important variables for sloping field and terraced land landscapes, respectively.

  2. Basin and Crater Ejecta Contributions to the South Pole-Aitken Basin (SPA) Regolith; Positive Implications for Robotic Surface Samples

    Science.gov (United States)

    Petro, Noah E.; Jolliff, B. L.

    2011-01-01

    The ability of impacts of all sizes to laterally transport ejected material across the lunar surface is well-documented both in lunar samples [1-4] and in remote sensing data [5-7]. The need to quantify the amount of lateral transport has lead to several models to estimate the scale of this effect. Such models have been used to assess the origin of components at the Apollo sites [8-10] or to predict what might be sampled by robotic landers [11-13]. Here we continue to examine the regolith inside the South Pole-Aitken Basin (SPA) and specifically assess the contribution to the SPA regolith by smaller craters within the basin. Specifically we asses the effects of four larger craters within SPA, Bose, Bhabha, Stoney, and Bellinsgauzen all located within the mafic enhancement in the center of SPA (Figure 1). The region around these craters is of interest as it is a possible landing and sample return site for the proposed Moon-Rise mission [14-17]. Additionally, understanding the provenance of components in the SPA regolith is important for interpreting remotely sensed data of the basin interior [18-20].

  3. Time distribution of heavy rainfall events in south west of Iran

    Science.gov (United States)

    Ghassabi, Zahra; kamali, G. Ali; Meshkatee, Amir-Hussain; Hajam, Sohrab; Javaheri, Nasrolah

    2016-07-01

    Accurate knowledge of rainfall time distribution is a fundamental issue in many Meteorological-Hydrological studies such as using the information of the surface runoff in the design of the hydraulic structures, flood control and risk management, and river engineering studies. Since the main largest dams of Iran are in the south-west of the country (i.e. South Zagros), this research investigates the temporal rainfall distribution based on an analytical numerical method to increase the accuracy of hydrological studies in Iran. The United States Soil Conservation Service (SCS) estimated the temporal rainfall distribution in various forms. Hydrology studies usually utilize the same distribution functions in other areas of the world including Iran due to the lack of sufficient observation data. However, we first used Weather Research Forecasting (WRF) model to achieve the simulated rainfall results of the selected storms on south west of Iran in this research. Then, a three-parametric Logistic function was fitted to the rainfall data in order to compute the temporal rainfall distribution. The domain of the WRF model is 30.5N-34N and 47.5E-52.5E with a resolution of 0.08 degree in latitude and longitude. We selected 35 heavy storms based on the observed rainfall data set to simulate with the WRF Model. Storm events were scrutinized independently from each other and the best analytical three-parametric logistic function was fitted for each grid point. The results show that the value of the coefficient a of the logistic function, which indicates rainfall intensity, varies from the minimum of 0.14 to the maximum of 0.7. Furthermore, the values of the coefficient B of the logistic function, which indicates rain delay of grid points from start time of rainfall, vary from 1.6 in south-west and east to more than 8 in north and central parts of the studied area. In addition, values of rainfall intensities are lower in south west of IRAN than those of observed or proposed by the

  4. Crustal structure of the Siberian craton and the West Siberian basin: An appraisal of existing seismic data

    DEFF Research Database (Denmark)

    Cherepanova, Yulia; Artemieva, Irina M.; Thybo, Hans

    2013-01-01

    We present a digital model SibCrust of the crustal structure of the Siberian craton (SC) and the West Siberian basin (WSB), based on all seismic profiles published since 1960 and sampled with a nominal interval of 50 km. Data quality is assessed and quantitatively assigned to each profile based...... on acquisition and interpretation method and completeness of crustal model. The database represents major improvement in coverage and resolution and includes depth to Moho, thickness and average P-wave velocity of five crustal layers (sediments, and upper, middle, lower, and lowermost crust) and Pn velocity...

  5. Management of open lower limb injuries in South West England and Wales.

    Science.gov (United States)

    Yarrow, J; Rahman, S; Marsden, N; Pallister, I; Hemington-Gorse, S

    2015-01-01

    The joint British Association of Plastic, Reconstructive and Aesthetic Surgeons/British Orthopaedic Association standards define best practice management in open diaphyseal fractures of the lower limb. The aim of our study was to review the regional approach and experience in South West England and Wales. A further objective was to evaluate service provision with regard to the standards' key recommendations. A prospective audit was undertaken of open diaphyseal fracture patients. Compliance with published standards within all orthoplastic services in South West England and Wales was assessed, and facilities were evaluated. A total of 86 patients were managed between October 2012 and March 2013. This was a 56% increase from 2008. Over half (56%) presented directly to the orthoplastic services with all patients undergoing debridement within 24 hours. Two-thirds (66%) of procedures were in daylight hours excluding those requiring immediate surgical intervention. Adherence to correct antibiotic therapy was 88% at admission, 50% at primary surgery and 62% at definitive surgery. Almost two-thirds (60%) of primary procedures were performed with combined senior orthoplastic teams, with 81% achieving definitive soft tissue coverage and fixation within seven days. Compliance improved in units with larger patient caseloads and where there was an early combined approach during daylight hours. Increased open lower limb fracture workload was demonstrated across South West England and Wales, probably owing to centralisation of trauma services. An improvement in early transfer of this patient group to orthoplastic facilities has allowed all patients to be assessed and debrided within the recommended timeframe. Standards were most likely to be met in those centres seeing higher numbers of injuries and when there was a daylight hours procedure by combined orthoplastic teams.

  6. Deciphering the mid-Carboniferous eustatic event in the central Appalachian foreland basin, southern West Virginia, USA

    Science.gov (United States)

    Blake, B.M.; Beuthin, J.D.

    2008-01-01

    A prominent unconformity, present across shallow shelf areas of the Euramerican paleoequatorial basins, is used to demark the boundary between the Mississippian and Pennsylvanian subsystems. This unconformity, the mid-Carboniferous eustatic event, is generally attributed to a major glacio-eustatic sea-level fall. Although a Mississippian-Pennsylvanian unconformity is recognized throughout most of the Appalachian region, the record of the mid-Carboniferous eustatic event in the structurally deepest part of the basin has been controversial. Based on early reports that suggested the most complete Pennsylvanian section was present in southern West Virginia, various conceptual depositional models postulated continuous sedimentation between the youngest Mississippian Bluestone Formation and the oldest Penn-sylvanian Pocahontas Formation. In contrast, tabular-erosion models envisioned axial drainage systems that evolved in response to changing basin dynamics. These models predicted a Mississippian-Pennsylvanian unconformity. All these models suffered from a lack of biostratigraphic control. The presence of a sub-Pocahontas paleovalley, herein named the Lashmeet paleovalley, has been confirmed in southern West Virginia. The Lashmeet paleovalley was incised over 35 m into Bluestone strata and filled by lithic sands derived from the Appalachian orogen to the northeast and east. The polygenetic Green Valley paleosol complex marks the Bluestone-Pocahontas contact on associated interfluves. Together, these features indicate a substantial period of subaerial exposure and argue strongly in favor of a Mississippian-Pennsylvanian unconformity. Paleontologic data from the Bluestone Formation, including marine invertebrates and conodonts from the marine Bramwell Member and paleofloral data, support a late, but not latest, Arnsbergian age assignment. Marine fossils are not known from the Pocahontas Formation, but macrofloral and palynomorph taxa support a Langsettian age for most of

  7. An Exploratory Study of the Women Entrepreneurial Motivation in the South-West Nigeria

    Directory of Open Access Journals (Sweden)

    Ph. D.Chinonye Okafor

    2011-12-01

    Full Text Available Women entrepreneurial motivation is a function of variables that are subject to authors and researchers’ opinions and views. These variables can be classified based on their impact on women entrepreneurial performance, behavior and challenges. This paper is therefore focused on examining the factors that affect women entrepreneurial motivation in the South-West Nigeria. The data used for the study was obtained through primary source. The data gathered was analyzed using the model of correlation analysis. Recommendations were made based on the result obtained from the testing of the hypothesis.

  8. ECONOMIC CRISIS IMPACT ON THE LABOR MARKET IN THE REGION SOUTH-WEST OLTENIA

    Directory of Open Access Journals (Sweden)

    Buşan Gabriela

    2013-06-01

    Full Text Available The international financial crisis has inevitably felt in the the Romanian economy influences transmitted through the various paths. The connection with the international economic flows has generated negative implications both in the economy and in various regions, as evidenced by analysis of key indicators: labor resources, civil active population, the activity rate of unemployment labor resources, etc.. The impact of economic crisis on the labor market in Romania has resulted in the job losses or temporary unemployment as a result technical or permanently, the termination of the contract of employment. The research aims to identify the adverse effects in the labor market at the level of the South West Oltenia.

  9. Source mechanisms of mining-related seismic events in the Far West Rand, South Africa

    CSIR Research Space (South Africa)

    Kassa, BB

    2009-09-01

    Full Text Available Meeting and Exhibition Swaziland, 16 - 18 September 2009, pages 69 - 72 Source mechanisms of mining-related seismic events in the Far West Rand, South Africa BB Kassa1, J Julià2, AA Nyblade2 and RJ Durrheim1,3 1University of the Witwatersrand... layer between the gold- bearing reefs, the forward problem can be formulated as [Trifu et al., 2000; Julia et al., 2009] u=cF:M where u = vector of spectral displacements, c = 1/(4pV3R), ρ = density, V = P- or S-wave velocity, R = hypocentral...

  10. The pollen stratigraphy of late Quaternary lake sediments of South-West Greenland

    DEFF Research Database (Denmark)

    Kelly, Michael; Funder, Svend Visby

    1974-01-01

    Pollen analysis and radiocarbon dating of lake sediment cores from four localities in the Frederikshab district, South-West Greenland, provide a chronology of vegetation changes in the area since c. 10000 B.P. An initial pioneer phase with the early development of some heath communities is followed...... composition of the vegetation however is influenced by immigration phenomena, with the appearance of many species lagging behind the attainment of their climatic thresholds. Detailed consideration is given to the possibility of Alnus crispa being present as a scrub component during the climatic optimum....

  11. Mid-Pleistocene Acheulean-like stone technology of the Bose basin, South China.

    Science.gov (United States)

    Yamei, H; Potts, R; Baoyin, Y; Zhengtang, G; Deino, A; Wei, W; Clark, J; Guangmao, X; Weiwen, H

    2000-03-03

    Stone artifacts from the Bose basin, South China, are associated with tektites dated to 803,000 +/- 3000 years ago and represent the oldest known large cutting tools (LCTs) in East Asia. Bose toolmaking is compatible with Mode 2 (Acheulean) technologies in Africa in its targeted manufacture and biased spatial distribution of LCTs, large-scale flaking, and high flake scar counts. Acheulean-like tools in the mid-Pleistocene of South China imply that Mode 2 technical advances were manifested in East Asia contemporaneously with handaxe technology in Africa and western Eurasia. Bose lithic technology is associated with a tektite airfall and forest burning.

  12. Recognition of relict Mesozoic Dongsha Basin in the northern margin, South China Sea and its implication

    Science.gov (United States)

    Yan, Pin; Wang, Yanlin

    2015-04-01

    The Pearl River Mouth Basin (PRMB) is dominated by NE-trending rift architecture produced mainly during Cenozoic Era. It comprises a series of grabens built up with thick Paleogene and thick Neogene sediments, up to 12000 m, and dividing basement highs composing Yanshanian granitic rocks. Though previously considered as one constituent part of PRMB in the southeast, Dongsha Basin displays major differences in sedimentary architecture and tectonic framework. Firstly, Dongsha Basin is characterized by a prominent angular unconformity, interpreted as a spectacular planation or rough erosion surface which separates the sediment column into two distinct parts. It is interpreted with accumulating seismic and drill data that the underlying strata comprise Early Cretaceous terrestrial, Jurassic marine and possibly Triassic sedimentary rocks totaling to 4~9 km thick, whereas the overlying strata are very thin (usually 0.5~1 km in whole) composing mainly Neogene sediments. The major sedimentary hiatus between them corresponds to the Late Cretaceous to mid-Miocene Epoch, well during the rifting to spreading process when the PRMB developed. Secondly, unlike the PRMB, the Dongsha Basin has suffered considerably less extension except its boundary areas, and actually remained as a relatively stable block though Cenozoic Era. Moreover, there are a few compressive open fold structures within the buried Mesozoic strata over the central Dongsha Basin. These folds trend in NNE and are characterized mostly by few minor growing upthrust faults with offsets in the order of few tens to hundreds meter. The upthrust faults dipped mostly southeastward against the northwestward subduction of paleo-Pacific plate as postulated in other previous study. The blind folds featured more like back-thrust growth tectonics, formed a broad NNE-SSW trending belt, obviously oblique to the trend of northern margin of the South China Sea and the PRMB as well. In a few recent models, the most prominent

  13. Distribution of calcretes and gypcretes in southwestern United States and their uranium favorability, based on a study of deposits in Western Australia and South West Africa (Namibia)

    Energy Technology Data Exchange (ETDEWEB)

    Carlisle, D.; Merifield, P.M.; Orme, A.R.; Kohl, M.S.; Kolker, O.; Lunt, O.R.

    1978-01-06

    Calcrete, dolocrete, and gypcrete carnotite are abundant in western Australia and Namib Desert, although only a few are of ore grade. The geology of these deposits are described. A genetic classification of calcretes emphasizing uranium favorability was developed, based on the distinction between pedogenic and nonpedogenic processes. Similarities between western Australia and South West Africa give support for the conclusions that lateral transport of U in groundwater is essential to ore deposition and that bedrock barriers or constrictions which narrow the channel of subsurface flow or force the water close to the land surface, greatly favor the formation of uraniferous calcretes. Criteria for uranium favorability deduced from the Australian and South West African studies were applied in a preliminary way to the southern Basin and Range Province of U.S. The procedure is to search for areas in which nonpedogenic calcrete or gypcrete may have developed. A caliche distribution map was compiled from soil survey and field data. Many areas were visited and some of the more interesting are described briefly, including parts of Clark County, Nevada, with occurrences of carnotite in calcrete. (DLC)

  14. Gamma irradiation of quartz from Pannier basin, South America

    Energy Technology Data Exchange (ETDEWEB)

    Enokihara, Cyro T.; Rela, Paulo R. [Instituto de Pesquisas Energeticas e Nucleares (IPEN/CNEN-SP), Sao Paulo, SP (Brazil)], E-mail: cteiti@ipen.br, E-mail: prela@ipen.br; Guttler, Rainer A.S. [Universidade de Sao Paulo (USP), SP (Brazil). Inst. de Geociencias

    2007-07-01

    The use of gamma radiation to induce or enhance color centers in gemstones is a widespread technique and applied worldwide on a industrial scale since at least 1970. The presence of defects and defect structures in quartz from a border region of southern Brazil and Uruguay are the reason for the creation of a new color variety of quartz called 'Prasiolite' in the gem trade. This quartz has a pleasant green color produced by gamma irradiation. The procedures of irradiation at IPEN show that the activation of these color producing defects can be monitored by detailed chemical and spectroscopic analysis. For the first time UV-VIS-NIR spectra of this new color variety of quartz are shown. They revealed special features of these quartz crystals coming from basaltic terranes of the Parana Basin. Contrary to most specimen of quartz from other parts of Brazil, they have such a high water and OH content that they resemble more chalcedony or opal, but not highly crystalline quartz specimens. The cause of the color are broken bonds of Si-OH defining the so-called dangling bonds. (author)

  15. Using Spatial Information Technologies as Monitoring Devices in International Watershed Conservation along the Senegal River Basin of West Africa

    Directory of Open Access Journals (Sweden)

    Yaw A. Twumasi

    2008-12-01

    Full Text Available In this paper, we present the applications of spatial technologies—Geographic Information Systems (GIS and remote sensing—in the international monitoring of river basins particularly analyzing the ecological, hydrological, and socio-economic issues along the Senegal River. The literature on multinational water crisis has for decades focused on mediation aspects of trans-boundary watershed management resulting in limited emphasis placed on the application of advances in geo-spatial information technologies in multinational watershed conservation in the arid areas of the West African sub-region within the Senegal River Basin for decision-making and monitoring. While the basin offers life support in a complex ecosystem that stretches across different nations in a mostly desert region characterized by water scarcity and subsistence economies, there exists recurrent environmental stress induced by both socio-economic and physical factors. Part of the problems consists of flooding, drought and limited access to sufficient quantities of water. These remain particularly sensitive issues that are crucial for the health of a rapidly growing population and the economy. The problems are further compounded due to the threats of climate change and the resultant degradation of almost the region’s entire natural resources base. While the pace at which the institutional framework for managing the waters offers opportunities for hydro electricity and irrigated agriculture through the proliferation of dams, it has raised other serious concerns in the region. Even where data exists for confronting these issues, some of them are incompatible and dispersed among different agencies. This not only widens the geo-spatial data gaps, but it hinders the ability to monitor water problems along the basin. This study will fill that gap in research through mix scale methods built on descriptive statistics, GIS and remote sensing

  16. Patient-orientated longitudinal study of multiple sclerosis in south west England (The South West Impact of Multiple Sclerosis Project, SWIMS 1: protocol and baseline characteristics of cohort

    Directory of Open Access Journals (Sweden)

    Wright Dave E

    2010-10-01

    Full Text Available Abstract Background There is a need for greater understanding of the impact of multiple sclerosis (MS from the perspective of individuals with the condition. The South West Impact of MS Project (SWIMS has been designed to improve understanding of disease impact using a patient-centred approach. The purpose is to (1 develop improved measurement instruments for clinical trials, (2 evaluate longitudinal performance of a variety of patient-reported outcome measures, (3 develop prognostic predictors for use in individualising drug treatment for patients, particularly early on in the disease course. Methods This is a patient-centred, prospective, longitudinal study of multiple sclerosis and clinically isolated syndrome (CIS in south west England. The study area comprises two counties with a population of approximately 1.7 million and an estimated 1,800 cases of MS. Self-completion questionnaires are administered to participants every six months (for people with MS or 12 months (CIS. Here we present descriptive statistics of the baseline data provided by 967 participants with MS. Results Seventy-five percent of those approached consented to participate. The male:female ratio was 1.00:3.01 (n = 967. Average (standard deviation age at time of entry to SWIMS was 51.6 (11.5 years (n = 961 and median (interquartile range time since first symptom was 13.3 (6.8 to 24.5 years (n = 934. Fatigue was the most commonly reported symptom, with 80% of participants experiencing fatigue at baseline. Although medication use for symptom control was common, there was little evidence of effectiveness, particularly for fatigue. Nineteen percent of participants were unable to classify their subtype of MS. When patient-reported subtype was compared to neurologist assessment for a sample of participants (n = 396, agreement in disease sub-type was achieved in 63% of cases. There were 836 relapses, reported by 931 participants, in the twelve months prior to baseline. Twenty

  17. Drug utilization in selected health facilities of South West Shoa Zone, Oromia Region, Ethiopia

    Directory of Open Access Journals (Sweden)

    Kebede M

    2015-07-01

    Full Text Available Mengistu Kebede, Dereje Kebebe Borga, Eshetu Mulisa Bobasa Department of Pharmacy, Jimma University, Jimma, Ethiopia Background: Sustaining the availability and rational use of safe and effective drugs is a major problem in developing countries. Irrational drug use affects quality of health care more than accessibility of drugs. Objective: To assess drug utilization in selected health facilities of South West Shoa Zone, Oromia Region, Ethiopia. Methods: A cross-sectional study was conducted in selected health facilities of South West Shoa Zone from January 21–28, 2012 by using structured questionnaires. Results: Of 50 prescribers and 30 dispensers, 58% and 83.3% were males, respectively. The result showed that majority of prescribers agreed on availability of essential drugs (72% and had access to up-to-date drug information (76%. However, 43.3% of dispensers didn't get access to up-to-date drug information. 86% and 88% of prescribers note cost of drugs and stick to standard treatment guidelines of Ethiopia during prescription, respectively. All drug dispensers check the name of the drug (100%, age of the patient (90%, the dosage form of drug (96.7%, the route of administration (90%, the duration of therapy (86.7%, and frequency of administration (86.7% for prescription papers. Conclusion: In general, drug utilization at the study sites was found to be good, although there are major deviations from the concept of rational drug use. Keywords: drug utilizations, rational drug use, health facilities

  18. Water Qualitative Parameters of Fluviatile Limans Located in the South - West of Dobrogea (Romania

    Directory of Open Access Journals (Sweden)

    Gheorghe ROMANESCU

    2013-06-01

    Full Text Available The fluviatile limans in the south-west of Dobrogea are the most characteristic forms of this type, with an exclusive development on the territory of Romania. In time, they were interpreted as fluvio-maritime limans or even as fluvio-lacustrine limans. As a result of the fact that they are situated close to the Danube, bordering one of the driest regions of Romania, they have had diverse usage since ancient times. Because the fluviatile limans in Dobrogea are mostly used in pisciculture, the water qualitative parameters have to be monitored permanently. They also have a role in attenuating floods, acting as a tampon against flash floods. Consequently, they have a special local importance even today, feeding as much of the population as possible (directly or indirectly. From a geomorphological point of view the fluviatile limans in Dobogea were formed as a result of the withdrawal of the Romanian (Levantine. The decrease in depth may cause the flood waves to pass over the dams. In this case, the periodical drainage of lake cuvettes is required. The physical parameters of water (depth, transparency and temperature as well as the chemical parameters (pH, dissolved oxygen, nitrates, nitrites, phosphates and the Ca/Mg ratio have been analyzed. From an ecological viewpoint, the fluviatile limans in the south-west of Dobrogea are suitable for fish breeding and for developing an adequate lacustrine life.

  19. Analysis of Restrictive Environments in the South-West Oltenia Development Region

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    Radu Matei Cocheci

    2016-12-01

    Full Text Available Restrictive environments can be defined as an area within a territorial system where development is constrained either by natural factors or anthropogenic factors. This paper aims to identify restrictive environments through multi-criteria analysis of Romania’s South West Oltenia development region, known for its issues regarding open-pit mining, desertification or flood risk. In order to achieve this, I proposed a typology of restrictive environments, based on an extensive literature review of natural and anthropogenic factors that can limit development. For each of the ten environmental restrictiveness types identified, several criteria were proposed, which were then weighted as a result of a questionnaire addressed to experts in the field of territorial planning. Based on the questionnaire results, an index of environmental restrictiveness is computed at LAU 2 level for the entire South-West Oltenia development region. The territorialized index highlights the environmental restrictiveness of areas susceptible to flood risk (e.g. along the Jiu valley, but also the problems faced by mining areas (Motru-Rovinari or isolated mountain areas. The computed index represents a first step towards the definition of potential inter-communal cooperation structures, that could become the object of territorial planning instruments aimed at mitigating restrictive environments.

  20. Underground Hydrosphere of the Sedimentary Basins as Naphtides-Generating System (on the Example of the South Caspian Basin

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    A.A. Feyzullayev

    2017-11-01

    Full Text Available The analysis of organic matter (OM content dissolved in the formation waters and waters of mud volcanoes (water dissolved organic matter – DOM of the oil and gas bearing South Caspian Basin and its distribution in stratigraphic and hypsometrical depth is given in the article. The stratigraphic interval of research covers the period from the Lower Pliocene to the Jurassic, and the depth interval: from 73 to 6043 m. In these intervals, the values ​​of the DOM in reservoir waters vary from 4.1 mg/l to 271.2 mg /l, averaging (by 219 analyzes 48.9 mg/l. A good correlation of the values ​​of DOM and OM in rocks has been established. In both cases, Paleogene and Jurassic rocks have the highest values. In the change of the DOM with depth, an increase in its values ​​from a depth of about 3.3 km is noted, which is possibly due to the onset of catagenetic transformation of OM into hydrocarbons in the rock-water system. The dependence of the DOM content on the mineralization of water has been established: its highest values ​​are characteristic for waters with mineralization not higher than 50 g/l. The waters of mud volcanoes are characterized by low levels of DOM and low mineralization, which is most likely due to their condensation nature. The conducted studies confirm the idea of ​​the DOM participation, along with the OM of rocks, in the processes of oil and gas generation. The process of OM transformation into oil and gas in aqueous solution should be taken into account in basin modeling and in estimating the predicted resources of hydrocarbons in the sedimentary basin.

  1. Rates of volcanic deposition, facies changes and movements in a dynamic basin: the Nuussuaq Basin, West Greenland, around the C27n-C26r transition

    DEFF Research Database (Denmark)

    Pedersen, A. K.; Larsen, L. M.; Riisager, P.

    2002-01-01

    The initial stages of Palaeogene volcanism in the Nuussuaq Basin in West Greenland were characterized by eruption of basaltic and picritic magmas through sediments of Cretaceous to early Paleocene age into a marine or lowlying coastal environment. Recent magnetostratigraphic work has recognized......, subsidence c. 25 m ka−1. If the volcanism evolved continuously at this high aggradation rate, all of the Vaigat Formation could have erupted in 70 ka. However, the complex geological record indicates a much longer total duration, and the volcanism must have had an intermittent character....... the C27n-C26r transition (estimated duration less than 10 ka and here assumed to be 5 ka) as a c. 170 m thick zone within a succession of thin picritic lava flows. Multimodel photogrammetry combined with chemical and lithological analysis of the volcanic rocks has allowed detailed 3D analysis...

  2. The velocity structure of a post-spreading volcanic seamount in the Southwest Sub-basin, South China Sea

    Science.gov (United States)

    Zhang, Jie; Li, Jiabiao; Ruan, Aiguo; Yu, Zhiteng; Niu, Xiongwei

    2017-04-01

    Post-spreading magmatism is extremely strong in the South China Sea and it is common feature for the pacific area (e.g. Castillo et al., 2010). Such seamounts formed by the post-spreading magmatism may provide key insights into a unique mechanism of strong magmatism without mantle convection as well as the crustal emplacement (e.g. Baloga et al., 1995; Kipf et al., 2013). We conducted a seismic refraction survey over an axial seamount (Longnan Seamount) in the Southwest Sub-basin, South China Sea in 2010. Results show that the post-spreading axial seamount is mainly formed by an extrusive process. Low upper-crustal velocities observed under the seamount are attributed to volcaniclastic rocks and high-porosity basalts. Velocity models reveal the lack of a large root and a relative high-velocity layer 3 underlying the seamount. The origin of axial seamounts is supposed to be buoyant decompression melting mechanism (Castillo et al., 2010; Meng and Zhang, 2014). This research was granted by the Natural Science Foundation of China (91028006, 91228205), the Scientific Research Fund of the Second Institute of Oceanography, SOA (JG1602) and the National Programme on Global Change and Air-Sea Interaction, SOA (GASI-GEOGE-01). References Castillo, P. R., Clague, D. A., Davis, A. S., et al., 2010. Petrogenesis of Davidson Seamount lavas and its implications for fossil spreading center and intraplate magmatism in the eastern Pacific. Geochemistry, Geophysics, Geosystems, 11, Q02005, doi:10.1029/2009GC002992 Baloga, S., Spudis, P. D. and Guest, J. E., 1995. The dynamics of rapidly emplaced terrestrial lava flows and implications for planetary volcanism. J. Geophys. Res., 100 (B12), 24509-24519. Kipf, A, Hauff, F., Werner, R., et al., 2014. Seamounts off the West Antarctic margin: A case for non-hotspot driven intraplate volcanism. Gondwana Res., 25 (4), 1660-1679. Meng, L., Zhang, J., 2014. The magmatic activity mechanism of the fossil spreading center in the Southwest sub-basin

  3. The South Pyrenean Eocene carbonate megabreccias revisited: new interpretation based on evidence from the Pamplona Basin

    Science.gov (United States)

    Payros, Aitor; Pujalte, Victoriano; Orue-Etxebarria, Xabier

    1999-05-01

    The South Pyrenean Foreland Basin contains numerous units of Eocene carbonate megabreccias intercalated with siliciclastic turbidites and derived by resedimentation of shallow-marine carbonate platforms. Previous studies were limited mainly to the foreland eastern part, known as the Jaca Basin. The present study from the Pamplona Basin, a western part of the foreland trough, sheds new light on the origin and regional significance of these South Pyrenean Eocene carbonate megabreccias (SPECMs). The number of the SPECM units in the foreland basin is higher than previously recognized and their age is somewhat older than originally assumed. The SPECM units appear to occur as time-stratigraphic clusters, which can be correlated with the relative sea-level lowstands and linked with phases of tectonic activity. The megabreccias were derived from a carbonate-platform system hosted by the foreland basin's southern (passive) margin. The episodic instability and mass wasting were triggered by phases of structural steepening (forebulge uplift) accompanied by high-magnitude earthquakes, with the former causing platform emergence, increased load stresses and excess pore-water pressure in the carbonate ramp. The SPECM deposits were emplaced by cohesive debris flows evolving into high-density turbidite currents. An ideal SPECM unit consists of (1) an immature, homogeneous debrite in the proximal part; (2) a differentiated, bipartite debrite and turbidite in the medial part; and (3) an incomplete, base-missing debrite overlain by turbidite, or a turbidite alone, in the distal part. The debrite component volumetrically predominates in the SPECM units, and the original terms `megaturbidite' and `seismoturbidite' thus seem to be inappropriate for these deposits.

  4. Present and Historical Climate Variability and its Ecological Impact on Vegetation in South West England

    Science.gov (United States)

    (Sasha) Kosanic, Aleksandra; Harrison, Stephan; Anderson, Karen; Turkington, Thea

    2014-05-01

    West Cornwall is the most south westerly part of the United Kingdom with a strong maritime climate. This study analyses the earliest archived instrumental meteorological records collected in West Cornwall (SW England). Records were obtained from the Met Office archive (Camborne 1957-2010; Culdrose 1985-2011), Trengwainton Garden (1940-2010), and from the Royal Cornwall Polytechnic Society, data for Falmouth (1880-1952) and Helston (1843-1888). Homogeneity tests were used (Levene and Brown-Forsythe tests) to exclude any trends not related to climate variability. The data exhibit trends in annual mean and maximum temperatures over the timescales analysed, and show a general temperature increase in the 20th and 21st century. Annual and seasonal temperature changes are found to vary locally with strongly positive trends in autumn, spring and summer seasons. Trends in precipitation are positive only for the 19th century and only for one station. Correlation with the North Atlantic Oscillation (NAO) index shows negative results for precipitation data. However correlation with the NAO index is positive with temperature, especially in the winter season. Return period analysis showed a decrease in intensity and frequency of extreme precipitation events in the post-1975 period (Camborne and Trengwainton Garden stations). Climate change in the 20th century, and future continued warming is likely to have major implications on biodiversity in this region. The second part of this research analyses changes in the geographical distribution of plant species over West Cornwall using herbarium and current vegetation records. Also we examine whether Ellenberg values could be used as an environmental change indicator. This research will clearly contribute to a better identification of the climate change impact in West Cornwall, but will also benefit policy developing strategies to identify areas at risk of climate impacts at the regional and local scale.

  5. Phenolics occurrence in surface water of the Dniester river basin (West Ukraine): natural background and industrial pollution

    Science.gov (United States)

    Sprynskyy, M.; Lebedynets, M.; Namieśnik, J.; Buszewski, B.

    2007-09-01

    Phenolics’ occurrence in surface water of the Dniester river basin (West Ukraine) with the definition of the natural background is studied. The main attention is given to the Upper Dniester basin and its tributary Stryj as the parts of the Sub-Carpathian oil- and gas province with the numerous objects of oil industry. The total amount of phenolics in water is studied. Phenolics’ concentrations from the first micrograms to the first milligrams per litre have been found in the surface water of the region. The natural background is defined as 0.012 mg l-1 for the areas out of the industrial influence. The anthropogenic part of phenolics is caused mainly by oil industry. The oil-producing objects provide the main phenolics’ releases in the region, due to the low protection level of mechanical facilities as well as to breach of technological norms on the oil-extracting objects. A man-made pollution of the basin water has a regional character and the natural self-purification processes seem to be insufficient for its neutralisation on the plains in particular.

  6. Regional Flood Frequency Analysis in the Volta River Basin, West Africa

    Directory of Open Access Journals (Sweden)

    Kossi Komi

    2016-02-01

    Full Text Available In the Volta River Basin, flooding has been one of the most damaging natural hazards during the last few decades. Therefore, flood frequency estimates are important for disaster risk management. This study aims at improving knowledge of flood frequencies in the Volta River Basin using regional frequency analysis based on L-moments. Hence, three homogeneous groups have been identified based on cluster analysis and a homogeneity test. By using L-moment diagrams and goodness of fit tests, the generalized extreme value and the generalized Pareto distributions are found suitable to yield accurate flood quantiles in the Volta River Basin. Finally, regression models of the mean annual flood with the size of the drainage area, mean basin slope and mean annual rainfall are proposed to enable flood frequency estimation of ungauged sites within the study area.

  7. Survey for Owls of the Nulhegan Basin and West Mountain Wildlife Management Area 2000

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — This report outlines a study done to document the distribution and relative abundance of nocturnal owls on the 48,000 acres comprising the Nulhegan Basin Division of...

  8. Determinants of loan repayment patterns among Micro Agricultural Financial Institution of South Africa beneficiaries in North West Province, South Africa

    Directory of Open Access Journals (Sweden)

    Idowu Oladele

    2016-12-01

    Full Text Available This paper examined the determinants of loan repayment patterns among Micro Agricultural Financial Institution of South Africa beneficiaries in North West Province, South Africa. A simple random sampling technique was used to select 280 respondents from a total of 344 beneficiaries. A structured questionnaire was used to collect data which was analysed using the Statistical Package for Social Sciences (SPSS with frequencies, percentages and probit regression. Majority of the farmers were males (86.8%, 71.4%, had secondary level school of education. A probit regression analysis was used to analyse factors affecting the repayment of loans, and the results showed that income from crops (t = -2.75; p = 0.006 is significant at 1% and has a negative coefficient. Other sources of income (t = -5.133; p = 0.000 is significant at 1%. The results further show that there were significant indirect relationship between financial capital and social capital (t = -7.106; p = 0.000 after MAFISA loans and loan repayment (t = -7.11; p = 0.000. The other significant variables are membership of organisation (t = -2.281; p = 0.023 and frequency of extension contact (t = -3.836; 0.000, and they are significant at 5% and 1% respectively.

  9. Application of Advanced Reservoir Characterization, Simulation, and Production Optimization Strategies to Maximize Recovery in Slope and Basin Clastic Reservoirs, West Texas (Delaware Basin)

    Energy Technology Data Exchange (ETDEWEB)

    Dutton, S.P.; Flanders, W.A.; Guzman, J.I.; Zirczy, H.

    1999-06-08

    The objective of this Class III project is to demonstrate that detailed reservoir characterization of slope and basin clastic reservoirs in sandstones of the Delaware Mountain Group in the Delaware Basin of West Texas and New Mexico is a cost-effective way to recover a higher percentage of the original oil in place through geologically based field development. This year the project focused on reservoir characterization of the East Ford unit, a representative Delaware Mountain Group field that produces from the upper Bell Canyon Formation (Ramsey Sandstone). The field, discovered in 1960, is operated by Orla Petco, Inc., as the East Ford unit; it contained an estimated 19.8 million barrels (MMbbl) of original oil in place. Petrophysical characterization of the East Ford unit was accomplished by integrating core and log data and quantifying petrophysical properties from wireline logs. Most methods of petrophysical analysis that had been developed during an earlier study of the Ford Geraldine unit were successfully transferred to the East Ford unit. The approach that was used to interpret water saturation from resistivity logs, however, had to be modified because in some East Ford wells the log-calculated water saturation was too high and inconsistent with observations made during the actual production. Log-porosity to core-porosity transforms and core-porosity to core-permeability transforms were derived from the East Ford reservoir. The petrophysical data were used to map porosity, permeability, net pay, water saturation, mobil-oil saturation, and other reservoir properties.

  10. Geochemistry and origins of natural gases in the Yinggehai and Qiongdongnan basins, offshore South China Sea

    Energy Technology Data Exchange (ETDEWEB)

    Huang, B.; Xiao, X.; Li, X. [Chinese Academy of Sciences, Guangzhou (China). Guangzhou Institute of Geochemistry

    2003-07-01

    Four gas fields and a number of gas-bearing structures have been discovered in the Yinggehai and Qiongdongnan basins offshore South China Sea. Chemical and isotopic data indicate the presence of at least three genetic groups of gases in these basins: biogenic gas, thermogenic gas, and gases with mixed origin. Thermogenic gases produced from the Yacheng field are characterized by relatively high contents of benzene and toluene, relatively low {delta}{sup 13}C values of toluene, and high abundance of bicadinanes and oleanane in the associated condensates, showing good correlation with the coal-bearing sequence of the Yacheng Formation in the Qiongdongnan Basin. Analyses on potential source rock samples indicate excellent gas source potential for both the coal-bearing sequence in the Yacheng Formation and the Miocene neritic shales containing type III-II2 kerogens. As the result of recent rapid subsidence and sedimentation, high temperature and overpressure systems are well developed in the Yinggehai and Qiongdongnan basins. Results of 1-D modeling indicate that the coal-bearing Yacheng Formation in the Yacheng Sag reached peak gas generation during mid Miocene-Pliocene time, after the deposition of upper Oligocene to lower Miocene reservoir rocks. The lower-mid Miocene marine shales reached their peak gas generation stage during the Pliocene-Quaternary in the central Yinggehai basin, supplying abundant gases to charge the Pliocene reservoirs. Focused-episodic gas migration significantly increased the hydrocarbon expulsion efficiencies of source rocks providing favorable conditions for the accumulation of large amounts of gases in the diapiric structures in a very short geological time. The gas-source relationship for the Yacheng field suggests dominantly short-distance gas migration and thus strong source facies controls on the geographic distribution of gas fields within the Qiongdongnan Basin.

  11. Assessment of unconvential (tight) gas resources in Upper Cook Inlet Basin, South-central Alaska

    Science.gov (United States)

    Schenk, Christopher J.; Nelson, Philip H.; Klett, Timothy R.; Le, Phuong A.; Anderson, Christopher P.; Schenk, Christopher J.

    2015-01-01

    A geologic model was developed for the assessment of potential Mesozoic tight-gas resources in the deep, central part of upper Cook Inlet Basin, south-central Alaska. The basic premise of the geologic model is that organic-bearing marine shales of the Middle Jurassic Tuxedni Group achieved adequate thermal maturity for oil and gas generation in the central part of the basin largely due to several kilometers of Paleogene and Neogene burial. In this model, hydrocarbons generated in Tuxedni source rocks resulted in overpressure, causing fracturing and local migration of oil and possibly gas into low-permeability sandstone and siltstone reservoirs in the Jurassic Tuxedni Group and Chinitna and Naknek Formations. Oil that was generated either remained in the source rock and subsequently was cracked to gas which then migrated into low-permeability reservoirs, or oil initially migrated into adjacent low-permeability reservoirs, where it subsequently cracked to gas as adequate thermal maturation was reached in the central part of the basin. Geologic uncertainty exists on the (1) presence of adequate marine source rocks, (2) degree and timing of thermal maturation, generation, and expulsion, (3) migration of hydrocarbons into low-permeability reservoirs, and (4) preservation of this petroleum system. Given these uncertainties and using known U.S. tight gas reservoirs as geologic and production analogs, a mean volume of 0.64 trillion cubic feet of gas was assessed in the basin-center tight-gas system that is postulated to exist in Mesozoic rocks of the upper Cook Inlet Basin. This assessment of Mesozoic basin-center tight gas does not include potential gas accumulations in Cenozoic low-permeability reservoirs.

  12. The Impact of Physical Facilities on Students' Level of Motivation and Academic Performance in Senior Secondary Schools in South West Nigeria

    Science.gov (United States)

    Akomolafe, Comfort Olufunke; Adesua, Veronica Olubunmi

    2016-01-01

    The paper examines the relevance of physical facilities in enhancing the level of motivation and the academic performance of senior secondary school students in South West Nigeria. The study adopted ex-post facto design. The population consists of all senior secondary students in South West Nigeria. The sample for the study include one thousand…

  13. Earth's crust model of the South-Okhotsk Basin by wide-angle OBS data

    Science.gov (United States)

    Kashubin, Sergey N.; Petrov, Oleg V.; Rybalka, Alexander V.; Milshtein, Evgenia D.; Shokalsky, Sergey P.; Verba, Mark L.; Petrov, Evgeniy O.

    2017-07-01

    Deep seismic studies of the Sea of Okhotsk region started in late 1950s. Since that time, wide-angle reflection and refraction data on more than two dozen profiles were acquired. Only five of those profiles either crossed or entered the deep-water area of the South-Okhotsk Basin (also known as the Kuril Basin or the South-Okhotsk Deep-Water Trough). Only P-waves were used to develop velocity-interface models in all the early research. Thus, all seismic and geodynamic models of the Okhotsk region were based only on the information on compressional waves. Nevertheless, the use of Vp/Vs ratio in addition to P-wave velocity allows discriminating felsic and mafic crustal layers with similar Vp values. In 2007 the Russian seismic service company Sevmorgeo acquired multi-component data with ocean bottom seismometers (OBS) along the 1700-km-long north-south 2-DV-M Profile. Only P-wave information was used previously to develop models for the entire profile. In this study, a multi-wave processing, analysis, and interpretation of the OBS data are presented for the 550-km-long southern segment of this Profile that crosses the deep-water South-Okhotsk Basin. Within this segment 50 seismometers were deployed with nominal OBS station spacing of 10-12 km. Shot point spacing was 250 m. Not only primary P-waves and S-waves but also multiples and P-S, S-P converted waves were analyzed in this study to constrain velocity-interface models by means of travel time forward modeling. In offshore deep seismic studies, thick water layer hinders an estimation of velocities in the sedimentary cover and in the upper consolidated crust. Primarily, this is due to the fact that refracted waves propagating in low-velocity solid upper layers interfere with high-amplitude direct water wave. However, in multi-component measurements with ocean bottom seismometers, it is possible to use converted and multiple waves for velocity estimations in these layers. Consequently, one can obtain P- and S

  14. Youngest dinocephalian fossils extend the Tapinocephalus Zone, Karoo Basin, South Africa

    Directory of Open Access Journals (Sweden)

    Michael O. Day

    2015-03-01

    Full Text Available The dinocephalians (Synapsida, Therapsida were one of the dominant tetrapod groups of the Middle Permian (Guadalupian Epoch, ~270–260 million years ago and are most abundantly recorded in the Tapinocephalus Assemblage Zone (AZ of the Main Karoo Basin, South Africa. Dinocephalians are thought to have become extinct near the top of the Abrahamskraal Formation of the Beaufort Group and their disappearance is one criterion used to define the base of the overlying Pristerognathus AZ. Because of the abundance of fossils in the Karoo, the Beaufort Group biozones form the biostratigraphic standard for later Permian terrestrial tetrapod ecosystems, so their stratigraphic delineation is of great importance to Permian palaeobiology. We report two new specimens of the rare tapinocephalid dinocephalian Criocephalosaurus from the lowermost Poortjie Member, which makes them the youngest dinocephalians known from the Main Karoo Basin and extends the Tapinocephalus AZ from the Abrahamskraal Formation up into the Teekloof Formation. The extension of the Tapinocephalus AZ relative to the lithostratigraphy potentially affects the biozone or biozones to which a fossil species can be attributed; this extension has implications for biostratigraphic correlations within the Main Karoo Basin as well as with other basins across Gondwana. These discoveries also indicate that a population of herbivorous tapinocephalids survived as rare constituents of the tetrapod fauna after most generic richness within the clade had already been lost.

  15. Paleo-environments of Late Pliocene to Early Pleistocene Foreland-Basin Deposits in the Western Foothills of South-Central Taiwan

    Science.gov (United States)

    Chiu, Tzu-Hsuan; Tien-Shun Lin, Andrew; Chi, Wen-Rong; Wang, Shih-Wei

    2017-04-01

    Lithofacies and paleo-environmental analyses of the Pliocene-Pleistocene deposits of Taiwan provide a framework to understand the stratigraphic development of foreland basin to the west of the orogenic belt. In this study, we performed lithofacies analyses and biostratigraphic studies on calcareous nannofossils in two areas in south-central Taiwan, the Jhuoshuei River, and the Hushan Reservoir, respectively. The studied lithostratigraphic units are the Chinshui Shale, the Cholan Formation, and the Toukoshan Formation, in an ascending order, with a total stratigraphic thickness more than 3500 m in central Taiwan. Sixteen lithofacies and four lithofacies associations are identified, pertaining to tide-dominated deltaic systems bordering a shallow marine setting in the foreland basin. A few wide-spread layers of thickly-bedded sandstones featuring ball-and-pillow structures are interpreted as resulting from earthquake shaking (i.e., seismites). In addition, the vertical facies change shows a coarsening and shallowing-upward succession, indicating the gradually filling up of the foreland basin by sediment progradation. The progradation is interpreted to result from westward migrating orogenic belt and an increase in sediment supply. The top 2000-m thick foreland succession (i.e., the uppermost part of the Cholan Formation, and the Toukoshan Formation) is dominantly fluvial deposits with occasional intercalations of shoreface sediments, indicating an extremely rapid and balanced rate of basin subsidence and sediment supply for the past 1.5 Ma. Vertebrate fossils of deer and elephants are identified in the upper Cholan Formation deposited in coastal to fluvial settings. Keywords: Pliocene-Pleistocene Epoch, lithofacies, foreland basin, Taiwan

  16. Modeling Glacier Mass Balance and Runoff in the Koxkar River Basin on the South Slope of the Tianshan Mountains, China, from 1959 to 2009

    Directory of Open Access Journals (Sweden)

    Min Xu

    2017-02-01

    Full Text Available Water resources provided by alpine glaciers are an important pillar for people in the arid regions of west China. In this study, the Hydrologiska Byrans Vattenavdelning (HBV light model was applied to simulate glacier mass balance (GMB and runoff in the Koxkar River Basin (KRB on the south slope of Mount Tumur, in the western Tianshan Mountains. Daily temperature and precipitation were calculated by multiple linear regressions and gradient-inverse distance weighting, respectively, based on in-situ observed data by automatic weather stations (AWSs in the Koxkar River Basin (KRB; 2007–2009 and four meteorological stations neighboring the basin (1959–2009. Observed daily air temperature and precipitation were input into HBV model. The runoff data in 2007/2008 and 2008/2009 were used to calibrate and validate the model in 2009/2010 and 2010/2011. Generally, the model simulated runoff very well. The annual glacier mass balance and runoff were calculated by the HBV model and were driven by interpolated meteorological data between 1959 and 2009. The calculated glacier mass balances were reasonable, and were compared with nearby glaciers. The results indicate the decreasing trend of mass balance in the Koxkar Glacier, with an average value of ablation of −370.4 mm·a−1 between 1959 and 2009. The annual runoff showed an increasing trend (5.51 mm·a−1. Further analysis showed that the runoff is more sensitive to temperature than precipitation in KRB.

  17. Geohydrology, Geochemistry, and Ground-Water Simulation-Optimization of the Central and West Coast Basins, Los Angeles County, California

    Science.gov (United States)

    Reichard, Eric G.; Land, Michael; Crawford, Steven M.; Johnson, Tyler D.; Everett, Rhett; Kulshan, Trayle V.; Ponti, Daniel J.; Halford, Keith L.; Johnson, Theodore A.; Paybins, Katherine S.; Nishikawa, Tracy

    2003-01-01

    Historical ground-water development of the Central and West Coast Basins in Los Angeles County, California through the first half of the 20th century caused large water-level declines and induced seawater intrusion. Because of this, the basins were adjudicated and numerous ground-water management activities were implemented, including increased water spreading, construction of injection barriers, increased delivery of imported water, and increased use of reclaimed water. In order to improve the scientific basis for these water management activities, an extensive data collection program was undertaken, geohydrological and geochemical analyses were conducted, and ground-water flow simulation and optimization models were developed. In this project, extensive hydraulic, geologic, and chemical data were collected from new multiple-well monitoring sites. On the basis of these data and data compiled and collected from existing wells, the regional geohydrologic framework was characterized. For the purposes of modeling, the three-dimensional aquifer system was divided into four aquifer systems?the Recent, Lakewood, Upper San Pedro, and Lower San Pedro aquifer systems. Most pumpage in the two basins is from the Upper San Pedro aquifer system. Assessment of the three-dimensional geochemical data provides insight into the sources of recharge and the movement and age of ground water in the study area. Major-ion data indicate the chemical character of water containing less than 500 mg/L dissolved solids generally grades from calcium-bicarbonate/sulfate to sodium bicarbonate. Sodium-chloride water, high in dissolved solids, is present in wells near the coast. Stable isotopes of oxygen and hydrogen provide information on sources of recharge to the basin, including imported water and water originating in the San Fernando Valley, San Gabriel Valley, and the coastal plain and surrounding hills. Tritium and carbon-14 data provide information on relative ground-water ages. Water with

  18. Investigating the regime of the South-West Indian Ocean Currents through a numerical model.

    Science.gov (United States)

    Fehmi, Dilmahamod; Reason, Chris; Hermes, Juliet; Penven, Pierrick

    2017-04-01

    The very complex South-West Indian Ocean (SWIO) consists of the Agulhas Current and its three main source regions, whose variability is known to influence the timing of ring formation at the Agulhas Retroflection, and ultimately the strength and stability of the Atlantic overturning circulation due to the leakage of water from the Indian Ocean into the Atlantic Ocean. The East Madagascar Current, being the focus of this study, endures transport changes, mostly influenced by large scale climate phenomena, and the high eddy kinetic energy (EKE) band observed at 25°S, travelling from Australia to Madagascar. Also occurring in the vicinity is the shallow eastward South Indian Ocean Countercurrent (SICC) flow and one of the largest dendroid phytoplankton blooms in the world, the South-east Madagascar Bloom. This unique system, where variability of the termination regime of the EMC, associated with complex mechanisms of the SICC and mesoscale eddies, is being investigated using a high resolution regional physical model. The mesoscale eddies' characteristics in the high EKE band will be discussed, with a section on its seasonality and longitudinal changes as they approach and interact with the western boundary. The eddy-current interaction influences the EMC variability, which in turn induces changes into its termination regime, south of Madagascar. Cross-correlation confirms a 1-month and 2.5 months lag between the EMC transport, and anti-cyclonic circulation and cyclonic circulation respectively, when the current rounds the southern tip of Madagascar. Furthermore, a small section will be dedicated to the possibility of nutrients being advected in the bloom area by the mesoscale eddies, and the complex mechanisms which cause the phytoplankton cells to use these nutrients, hence triggering the bloom at various spots simultaneously.

  19. Assessment of undiscovered conventional oil and gas resources in the West Korea Bay–North Yellow Sea Basin, North Korea and China, 2017

    Science.gov (United States)

    Schenk, Christopher J.; Tennyson, Marilyn E.; Mercier, Tracey J.; Hawkins, Sarah J.; Finn, Thomas M.; Gaswirth, Stephanie B.; Marra, Kristen R.; Klett, Timothy R.; Le, Phuong A.; Leathers-Miller, Heidi M.; Woodall, Cheryl A.

    2017-07-11

    Using a geology-based assessment methodology, the U.S. Geological Survey estimated mean undiscovered, technically recoverable conventional resources of 1.1 billion barrels of oil and 2.2 trillion cubic feet of gas in the West Korea Bay–North Yellow Sea Basin, North Korea and China.

  20. Assessment of undiscovered continuous oil and shale-gas resources in the Bazhenov Formation of the West Siberian Basin Province, Russia, 2016

    Science.gov (United States)

    Klett, Timothy R.; Schenk, Christopher J.; Brownfield, Michael E.; Leathers-Miller, Heidi M.; Mercier, Tracey J.; Pitman, Janet K.; Tennyson, Marilyn E.

    2016-11-10

    Using a geology-based assessment methodology, the U.S. Geological Survey estimated mean continuous resources of 12 billion barrels of oil and 75 trillion cubic feet of gas in the Bazhenov Formation of the West Siberian Basin Province, Russia.

  1. Molecular epidemiology of mumps virus strains circulating in south-west China from 2007 to 2009.

    Science.gov (United States)

    Shi, Haijing; Liu, Longding; Ma, Shaohui; Chen, Junying; Che, Yanchun; Wang, Jingjing; Li, Qihan

    2011-10-01

    The genetic characteristics of mumps virus (MuV) strains isolated from sporadic mumps cases between 2007 and 2009 in three provinces of south-west China were investigated. MuV detection was carried out by nested RT-PCR on 117 cases. The small hydrophobic gene of 33 isolated strains was identified, and sequence analysis revealed that all the isolates belonged to the lineage genotype F with slight nucleotide variation. Furthermore, the virus haemagglutinin-neuraminidase and nucleoprotein antigens exhibited a high degree of nucleotide and amino acid similarity (>99 %) within all isolates, whilst the fusion protein appeared to have certain geographical differences. This study on molecular surveillance will help to monitor the circulation of MuV in China.

  2. INDIVIDUALISATION OF DEPRIVED AREAS IN ROMANIA’S SOUTH WEST REGION

    Directory of Open Access Journals (Sweden)

    Radu-Matei COCHECI

    2015-12-01

    Full Text Available Measuring territorial disparities is the first step in studies aiming to improve territorial cohesion. As intraregional disparities are often higher than inter-regional ones, an analysis of development at local level is needed in order to define areas of intervention for specific targeted policies. The aim of this study is to individualise deprived areas in Romania’s South West region through the use of the Principal Component Analysis run on 15 social, economic, demographic and physical indicators defined at local level (LAU 2 units. By computing a global index of deprived areas, 13 areas were individualised at regional level, with the results being compared with other studies on deprived areas (Romania’s poverty map, Social Development Index and Less-favoured areas. The final output showcased the differences in defining deprived areas according to the used methodology, with a need to standardise such methods for policy targeting in the future while also considering environmental quality factors.

  3. Macro and trace elements in Paracentrotus lividus gonads from South West Atlantic areas

    DEFF Research Database (Denmark)

    Camacho, Carolina; Rocha, A. Cristina; Barbosa, Vera L.

    2018-01-01

    Sea urchin represents one of the most valuable seafood product being harvested and explored for their edible part, the gonads or roe. This species is generally considered a sentinel organism for ecotoxicological studies being widely used in monitoring programs to assess coastal aquatic environments...... three South West Atlantic production areas subjected to distinct environmental and anthropogenic pressures. In all studied areas, the elements profile in sea urchin gonads was Cl > K > P > Ca > S > Zn > Br > Fe > Sr > I > Rb > Cu > Se > Cr > Ni, suggesting an element guide profile with special interest...... for sea urchin farming development. Concerning toxic elements, the profile was the following: As > Cd > Pb > Hg > iAs. The results evidenced higher levels of Pb and Hg in open areas. Distinct area characteristics and anthropogenic pressures of production areas evidence the importance of biomonitoring...

  4. Bioaccumulation of metals by Fucus ceranoides in estuaries of South West England.

    Science.gov (United States)

    Varma, Ranjit; Turner, Andrew; Brown, Murray T

    2011-11-01

    Fucus ceranoides tolerates abiotic conditions encountered across the full range of estuarine salinities. We examined the bioaccumulation of metals in individuals and metal concentrations in accompanying sediment samples collected at different locations along estuaries of South West England. Intra- and inter-estuarine variations in metal accumulation by F. ceranoides, after correction for particulate contamination using Fe as a proxy, were attributed to variations in the availabilities and concentrations of aqueous metals. Greatest accumulation was observed in estuaries that remain most heavily impacted by historical mining activities and for metals that were mobilised to the greatest extent during these operations (As, Cu, Sn, Zn). Arsenic concentrations displayed a seaward increase in estuaries in which multiple samples were taken, whereas Cd concentrations were always greatest in samples collected from the most landward locations. Ongoing research aims to better understand the mechanisms and kinetics of metal interactions with F. ceranoides and their dependence on salinity. Copyright © 2011 Elsevier Ltd. All rights reserved.

  5. Net ecosystem exchange in a sedge-sphagnum fen at the South of West Siberia, Russia

    Science.gov (United States)

    Dyukarev, Egor

    2017-04-01

    The model of net ecosystem exchange was used to study the influence of different environmental factors and to calculate daily and growing season carbon budget for minerotrophic fen at South of West Siberia, Russia. Minerotrophic sedge-sphagnum fen occupies the central part of the Bakcharskoe bog. The model uses air and soil temperature, incoming photosynthetically active radiation, and leaf area index as the explanatory factors for gross primary production, heterotrophic and autotrophic respiration. The model coefficients were calibrated using data collected by automated soil CO2 flux system with clear long-term chamber. The studied ecosystem is a sink of carbon according to modelling and observation results. This study was supported by Russian Foundation for Basic Researches (grant numbers 16-07-01205 and 16-45-700562.

  6. Marriage, intimacy and risk of HIV infection in south west Uganda.

    Science.gov (United States)

    Agol, Dorice; Bukenya, Dominic; Seeley, Janet; Kabunga, Elazabeth; Katahoire, Anne

    2014-12-01

    Long-term, monogamous, relationships are often portrayed as protective in HIV prevention campaigns. Focusing on marriage in a community in south west Uganda, we examine why and how people enter long term relationships, what their expectations are and what factors sustain those relationships. Qualitative data were collected using in-depth interviews with 50 men and women randomly selected from a General Population Cohort. The results showed that managing expectations to sustain marriage is challenging; however the socio-economic and cultural benefits of marriage: having children, property acquisition as well as securing societal status tend to overshadow the costs associated with risks from infidelity such as sexually transmitted infections (including HIV). Recognising the compromises that couples may make to sustain their marriage is an important step towards acknowledging that 'being faithful' may be about staying together and showing commitment, not sexual exclusivity.

  7. Using reflection seismics to identify and monitor the basal conditions of Russell Glacier South West Greenland.

    Science.gov (United States)

    Hofstede, Coen; Kleiner, Thomas; Bondzio, Johannes; Eisen, Olaf; Wilhelms, Frank; Bohleber, Pascal; Fritzsche, Diedrich; Hubbard, Alun

    2015-04-01

    Russell Glacier is a land terminating glacier in South West Greenland. Survey site SHR lies at several kilometers from the terminus and is closely monitored. In recent years in Summer months, site SHR has seen unusual high ice velocities of up to 400m/a which have been linked to increased Summer melt. To capture the probably changing basal conditions of Russell Glacier at SHR we carried out two seismic surveys at site SHR, one in September 2013 at the end of the melt season and one in May 2014 at the start of the melt season. The seismic data were recorded using a 300m snow streamer and explosives. The data reveal an ice thickness of about 550m and 30 to 40m thick accreted subglacial sediments with varying degrees of water saturation in both ice and sediment. We speculate the increased ice velocity is caused by sediments that become temporarily liquefied in the Summer months.

  8. An LCA of WA's south west interconnected electricity grid year ending 2002

    Energy Technology Data Exchange (ETDEWEB)

    Aaron Cottrell; Jason Nunn; Louis Wibberley

    2006-03-15

    The LCA has been carried out to quantify the environmental impacts of power generation, transmission and distribution in Western Australia. This report is part of a series of life cycle analysis (LCA) studies of the Australian State electricity grids which are being undertaken to provide benchmarks for future studies. The present study covers only the South West Interconnected System (SWIS), which accounts for approximately 55% of the total power generated in Western Australia, the remainder being generated by captive power plants. The study aims to provide a more detailed study than in previous reports, which tend to focus only on greenhouse gas emissions, and includes several other key performance indicators - resource energy and fresh water consumption, greenhouse gas emissions, NOx, SOx, particulates and solid waste emissions. Also included is the range of substances reported for the SWIS from the National Pollutant Inventory (NPI) database.

  9. External occupational exposures in some NORM industries located at the South-West of Spain

    Science.gov (United States)

    Bolivar, J. P.; García-Tenorio, R.

    2008-08-01

    Detailed mappings of the external exposures which can be received by the workers in two NORM industrial factories located at the South-West of Spain have been performed: one devoted to the production of phosphoric acid, and the other devoted to the production of titanium dioxide pigments. In most places of the analyzed factories, the external exposures are moderated, although in some specific points, and associated to the presence of scales, their values are clearly higher. Nevertheless, under normal running conditions, the contribution of the external exposures to the effective doses received by the workers is lower than 1 mSv/y because the worker occupancy factors values are very low in the places with the highest external exposures.

  10. Performance and productivity changes in microfinance banks in South-West Nigeria

    Directory of Open Access Journals (Sweden)

    Musa A. Olasupo

    2014-12-01

    Full Text Available The Nigerian Microfinance sub-sector is yet to attain the desired level of global best practice. This paper thus investigated the performance and productivity changes of MFBs in South-West Nigeria, from 2006 to 2010, having had the Microfinance Policy launched in 200. From the use of relevant accounting ratios, the study revealed that only 16% of the sampled MFBs met the recommended maximum PAR value of 5% in 200. It was also revealed that 31% of the sampled MFBs reported a debt/equity ratio above the recommended value of 2 in 2006, while 32% had gearing of over 2 in 2010. The Malmquist productivity index revealed that the MFBs experienced fluctuating performances in their productivity changes, with pure technical efficiency improvements in 2007 and 2009. Overall, the performance and productivity changes experienced by the MFBs depicted a sub-sector with huge potentials and hence require nurturing to achieve its goals.

  11. Ethics issues and research in vulnerable communities: a case study from the North West province of South Africa

    CSIR Research Space (South Africa)

    Smith, R

    2014-10-01

    Full Text Available study described here, researchers used a community-based participatory research design to study the impact of an ICT intervention on a group of largely illiterate, low status elderly woman in a rural village in the North West province of South Africa...

  12. Modelling the effects of climate and land cover change on groundwater recharge in south-west Western Australia

    National Research Council Canada - National Science Library

    Dawes, W; Ali, R; Varma, S; Emelyanova, I; Hodgson, G; McFarlane, D

    2012-01-01

    .... There is expected to be a reduction of diffuse recharge across the Swan Coastal Plain. This study aims to quantify the change in groundwater recharge in response to a range of future climate and land cover patterns across south-west Western Australia...

  13. Ongeluk basaltic andesite formation in Griqualand West, South Africa: Submarine alteration in a 2222 Ma Proterozoic sea

    CSIR Research Space (South Africa)

    Cornell, DH

    1996-07-01

    Full Text Available The Ongeluk lavas form part of the Palaeoproterozoic Transvaal-Griqualand West supracrustal sequence of the Archaean Kaapvaal Craton of South Africa. They form a thick shallow-marine volcanic sequence of pillow lava, massive flows and hyaloclastite...

  14. Youthful Lust and Violation of Mobile Phone Rule in a Private Christian Mission University, South West Nigeria

    Science.gov (United States)

    Ojo, Omonijo Dare; Ugochukwu, Nnedum Obiajulu Anthony; Obinna, Ezeokana Jude

    2011-01-01

    This study aims at discovering the difference in the perceived lack of privacy in communication and violation of mobile phone rule among students in a Private Christian Mission University, South-West Nigeria. It equally tries to discover if there is a difference in the perceived students' desire to express love to the opposite sex and violation of…

  15. Conceptions of the Nature of Science Held by Undergraduate Pre-Service Biology Teachers in South-West Nigeria

    Science.gov (United States)

    Adedoyin, A. O.; Bello, G.

    2017-01-01

    This study investigated the conceptions of the nature of science held by pre-service undergraduate biology teachers in South-West, Nigeria. Specifically, the study examined the influence of their gender on their conceptions of the nature of science. The study was a descriptive research of the survey method. The population for the study comprised…

  16. Probability mapping of iron pan presence in sandy podzols in South-West France, using digital soil mapping.

    NARCIS (Netherlands)

    Richer-de-Forges, Anne C.; Saby, Nicolas P.A.; Mulder, V.L.; Larochea, B.; Arrouaysa, B.; Arrouaysa, D.

    2017-01-01

    This work evaluated two different digital soil mapping methods for mapping the presence of iron pans in South-West France. The presence of iron pans limit rooting depth, thereby affecting available water content for plants and increasing vulnerability of trees to storms. In some cases, it may also

  17. Overview of the structural geology and tectonics of the Central Basin Platform, Delaware Basin, and Midland Basin, West Texas and New Mexico

    Energy Technology Data Exchange (ETDEWEB)

    Hoak, T. [Kestrel Geoscience, Littleton, CO (United States); Sundberg, K. [Phillips Petroleum Co., Bartlesville, OK (United States); Ortoleva, P. [Indiana Univ., Bloomington, IN (United States)

    1998-12-31

    The structural geology and tectonics of the Permian Basin were investigated using an integrated approach incorporating satellite imagery, aeromagnetics, gravity, seismic, regional subsurface mapping and published literature. The two primary emphases were on: (1) delineating the temporal and spatial evolution of the regional stress state; and (2) calculating the amount of regional shortening or contraction. Secondary objectives included delineation of basement and shallower fault zones, identification of structural style, characterization of fractured zones, analysis of surficial linear features on satellite imagery and their correlation to deeper structures. Gandu Unit, also known as Andector Field at the Ellenburger level and Goldsmith Field at Permian and younger reservoir horizons, is the primary area of interest and lies in the northern part of Ector county. The field trends northwest across the county line into Andrews County. The field(s) are located along an Ellenburger thrust anticline trap on the eastern margin of the Central Basin Platform.

  18. Malignancy in scleroderma patients from south west England: a population-based cohort study.

    LENUS (Irish Health Repository)

    Siau, Keith

    2010-01-08

    The pathophysiological relationship between scleroderma and malignancy remains poorly understood. Although some previous studies have demonstrated an increased malignancy risk in patients with scleroderma, others have been inconclusive. We aimed to determine if patients with scleroderma had an increased risk of malignancy compared to an age- and sex-matched local South West England population, and if there were any important differences between scleroderma patients with and without malignancy. Methods of this study are as follows. Notes were obtained on all local scleroderma patients (n = 68) locally, and those diagnosed with malignancy verified by contacting each patient\\'s general practitioner. Expected malignancy figures were obtained from age- and sex-stratified regional prevalence data provided by the South West Cancer Intelligence Service registry. Among the patients, 22.1% with scleroderma were identified with concurrent malignancy. Affected sites were of the breast (n = 5), haematological system (n = 5), skin (n = 4), and unknown primary (n = 1). Overall, malignancy risk was found to be increased in scleroderma (RR = 3.15, 95% CI 1.77-5.20, p = 0.01). In particular, this risk was the highest for haematological malignancies (RR = 18.5, 95% CI 6-43, p = 0.03), especially for non-Hodgkin\\'s lymphoma (RR = 25.8, 95% CI 5-75, p = 0.10). The majority of patients (86.7%) developed malignancy after the onset of scleroderma (mean = 6.9 years). Age of >70 and patients with limited scleroderma were significant risk factors for a patient with scleroderma to have a concurrent malignancy; however, no increased risk was found in patients with any particular pattern of organ involvement, cytotoxic usage or serology. To conclude, in this small patient cohort, we have found that scleroderma is associated with an increased risk of malignancy. This risk is statistically significant in patients with limited scleroderma. Patients who are elderly and those with limited disease

  19. Psychological services in five South-west Queensland communities--supply and demand.

    Science.gov (United States)

    Buikstra, Elizabeth; Fallon, Anthony B; Eley, Robert

    2007-01-01

    This research gathered information in 2004 about psychological services provided to five rural communities located in South-west Queensland, Australia. Specifically, the aims of the project were to: (i) undertake an audit of existing psychological services; and (ii) determine the need for psychological services as perceived by providers of current services. Potential providers of psychological services were contacted to confirm the nature and extent of their provision of psychological support to target communities. Thirty organisations met the definition of service providers offering assessment or intervention by qualified and/or experienced persons. Data were collected by semi-structured telephone interviews with 44 employees of the service providers. The one main publicly-funded provider of services to the region offered limited services to the communities. Although some counselling was provided by social workers attached to the allied health program, for patients to be supported by the mental health sector of this service, they must have had moderate to severe mental illness. Regular, reliable and accessible psychological support for other conditions was limited largely to services provided by non-government organisations (NGOs) which are often constrained by continuity of funds. Counselling for alcohol and drug misuse, women's issues, sexual abuse, and crisis support were the most commonly identified unmet needs across the target communities. Difficulties in attracting experienced personnel to work in rural communities were reported. This was exacerbated by lack of job security brought about by short term funding to the NGOs. In general, unqualified counsellors were recognised as providing valuable services. There are limited psychological support services provided to these South-west Queensland communities. For available services, there are strict criteria for entry, limited accessibility and availability or lack of continuity owing to short-term funding

  20. Prevalence and impacts of low back pain among peasant farmers in South-West Nigeria

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    Bosede Abidemi Tella

    2013-08-01

    Full Text Available Objectives: A relationship between low back pain (LBP and poor postures has been previously established with a high prevalence observed in many occupations. This study aimed to investigate the prevalence of LBP, associated risk factors and impacts on farmers in South-West Nigeria. Materials and Methods: Six hundred and four farmers completed a 36-item closed-ended questionnaire which was translated to Yoruba language with content validity and back translation done afterwards. The questionnaire sought information on demographic data, 12-month prevalence, severity, history, causes and management of LBP, and its impacts on farm activities and the activities of daily living. Data was analyzed using the Statistical Package for Social Sciences (SPSS version 17. Data was summarized using descriptive statistics of mean, range, frequency, standard deviation, percentage. Chi2 and Mann-Whitney-U test were used to find association between variables. The level of significance was set at α = 0.05. Results: The 12-month prevalence of LBP among the respondents was 74.4%. Low back pain was described as moderate in 53.4%. Prolonged bending (51.3% was the most related risk factor. A considerable proportion (65.9% of the respondents were unable to continue some of the previously enjoyed activities. Males had significantly higher (p < 0.05 prevalence, recurrence and duration of LBP than the females. Conclusion: There is a high prevalence of LBP among farmers in South-West Nigeria. Age, sex and years of involvement in farming have a significant influence on the prevalence of LBP.

  1. Pathology of fatal lineage 1 and 2 West Nile virus infections in horses in South Africa

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    June H. Williams

    2014-02-01

    Full Text Available Since 2007, West Nile virus (WNV has been reported in South African horses, causing severe neurological signs. All cases were of lineage 2, except for one case that clustered with lineage 1 viruses. In the present study, gross and microscopic lesions of six South African lineage 2-infected horses and the one lineage 1 case are described. Diagnoses were confirmed by real-time reverse-transcriptase polymerase chain reaction (RT-PCR of central nervous system (CNS tissue and one by RT-PCR of a brain virus isolate. The CNS of all cases was negative by RT-PCR or immunohistochemistry (IHC for African horse sickness (AHS, equine encephalosis virus, equine herpes viruses 1 and 4, other zoonotic flaviviruses, alphaviruses, and shunivirus, and either by immunofluorescence or IHC for rabies. Gross visceral lesions were nonspecific but often mimicked those of AHS. The CNS histopathology of WNV lineage 2 cases resembled the nonsuppurative polioencephalomyelitis reported in the Northern Hemisphere lineage 1 and recent Hungarian lineage 2 cases. Occasional meningitis, focal spinal ventral horn poliomalacia, dorsal and lateral horn poliomyelitis, leucomyelitis, asymmetrical ventral motor spinal neuritis and frequent olfactory region involvement were also seen. Lineage 2 cases displayed marked variations in CNS lesion severity, type and distribution, and suggested various viral entry routes into the CNS, based on findings in experimental mice and hamsters. Lineage 1 lesions were comparable to the milder lineage 2 cases. West Nile virus IHC on CNS sections with marked lesions from all cases elicited only two antigen-positive cells in the olfactory cortex of one case. The presence in the CNS of T-lymphocytes, B-lymphocytes, plasma cells and macrophage-monocytes was confirmed by cluster of differentiation (CD 3, CD20, multiple myeloma oncogene 1 (MUM1 and macrophage (MAC 387 IHC.

  2. Reservoir-Driven Heterogeneous Distribution of Recorded Human Puumala virus Cases in South-West Germany.

    Science.gov (United States)

    Drewes, S; Turni, H; Rosenfeld, U M; Obiegala, A; Straková, P; Imholt, C; Glatthaar, E; Dressel, K; Pfeffer, M; Jacob, J; Wagner-Wiening, C; Ulrich, R G

    2017-08-01

    Endemic regions for Puumala virus (PUUV) are located in the most affected federal state Baden-Wuerttemberg, South-West Germany, where high numbers of notified human hantavirus disease cases have been occurring for a long time. The distribution of human cases in Baden-Wuerttemberg is, however, heterogeneous, with a high number of cases recorded during 2012 in four districts (H districts) but a low number or even no cases recorded in four other districts (L districts). Bank vole monitoring during 2012, following a beech (Fagus sylvatica) mast year, resulted in the trapping of 499 bank voles, the host of PUUV. Analyses indicated PUUV prevalences of 7-50% (serological) and 1.8-27.5% (molecular) in seven of eight districts, but an absence of PUUV in one L district. The PUUV prevalence differed significantly between bank voles in H and L districts. In the following year 2013, 161 bank voles were trapped, with reduced bank vole abundance in almost all investigated districts except one. In 2013, no PUUV infections were detected in voles from seven of eight districts. In conclusion, the linear modelling approach indicated that the heterogeneous distribution of human PUUV cases in South-West Germany was caused by different factors including the abundance of PUUV RNA-positive bank voles, as well as by the interaction of beech mast and the proportional coverage of beech and oak (Quercus spec.) forest per district. These results can aid developing local public health risk management measures and early warning models. © 2016 Blackwell Verlag GmbH.

  3. Compressional salt tectonics in the early stages of the South Pyrenean foreland basin

    Science.gov (United States)

    Burrel, Laura; Teixell, Antonio

    2017-04-01

    Salt tectonics in the Pyrenees has been widely documented for the Cretaceous extensional episode, defining the existence of salt walls and minibasins along the northern and southern Pyrenean paleomargins. The original geometry of these salt structures was heavily overprinted by shortening during the Alpine orogeny, but restored models have been documented. Other features explored regarding salt tectonics are the big domic or equidimensional diapirs that evolved during the Late Tertiary and still retain their shape in the southern Pyrenees. In either case, the Triassic Keuper evaporite layer is the source layer for the diapiric structures, which is also traditionally recognized as the main detachment level for the external Pyrenean thrust belts. In this work we focus on the role played by salt during the early stages of Alpine compression, which has been comparatively much less investigated. The Late Cretaceous to Eocene early foreland basin of the Southern Pyrenees shows evidence of salt movement that is often overlooked due to the most evident imprint of thrusts and associated fault-related folds. In this preliminary study we report field examples that shed some light on the interplay between halokinesis and buckling in the low-strain compressional regime during the early stages of the Pyrenean orogeny. Also we discuss how the growing salt structures control the local subsidence and the sediment dispersal patterns within the basin. We describe cases of salt-related geometries in the Eocene basins of the southern Pyrenees in areas as the footwall of the Montsec thrust -the Ager basin-, the External Sierras south of the Jaca basin, and the Pobla de Segur and Senterada intramontane conglomerate deposits on the Boixols and Nogueres thrust sheets. The examples are separate, but they offer a wide range of geometries such as tight synclines, vertical and overturned fold limbs, growth strata, and fault boundaries that can be interpreted as thrust welds. These serve as a

  4. Mesozoic lacustrine system in the Parnaíba Basin, northeastern Brazil: Paleogeographic implications for west Gondwana

    Science.gov (United States)

    Cardoso, Alexandre Ribeiro; Nogueira, Afonso César Rodrigues; Abrantes, Francisco Romério; Rabelo, Cleber Eduardo Neri

    2017-03-01

    The fragmentation of the West Gondwana during Early Triassic to Cretaceous was marked by intense climatic changes, concomitant with the establishment of extensive desertic/lacustrine systems. These deposits succeeded the emplacement and extrusion of lava flows, related to the pre-rift phase and initial opening of the Equatorial Atlantic Ocean. The thermal phase is recorded in the Upper Jurassic-Lower Cretaceous Pastos Bons Formation, exposed mainly in southeast parts of the Parnaíba Basin, Northeastern Brazil. The sedimentary facies of this unit were grouped in two facies associations (FA), representative of a shallow lacustrine system, influenced by episodic hyperpycnal and oscillatory flows. Central lake facies association (FA1) is composed by laminated mudstone (Ml), sandstone/mudstone rhythmite (S/Mr) and sandstone with even-parallel lamination (Sel). Flysch-like delta front (FA2) consists in sandstones with wave structures (Sw), sandstones with even-parallel stratification (Ses), massive sandstones (Sm), sandstones with soft-sediment deformation structures (Sd) and laminated mudstones (Ml). FA1 was deposited in the deepest portions of the lake, characterized by low energy, episodically disturbed by siliciclastic influx. FA2 presents sandy deposits generated by unconfined flow, probably fed by ephemeral stream flows that generated thickening upward of tabular sandstone beds. The progressive filling of the lake resulted in recurrent shoaling up of the water level and reworking by wave action. The installation of Pastos Bons lakes was controlled by thermal subsidence, mainly in restricted depocenters. The siliciclastic fluvial inflow can be related to the adjacent humid desertic facies, formed under climatic attenuation, typical of post-Triassic period, with reduced biological activity. Smectite and abundant feldspars, in lacustrine facies, corroborate an arid climate, with incipient chemical weathering. The new facies and stratigraphic data present in this

  5. Spatio-Temporal Identification of Areas Suitable for West Nile Disease in the Mediterranean Basin and Central Europe.

    Directory of Open Access Journals (Sweden)

    Annamaria Conte

    Full Text Available West Nile virus (WNV is a mosquito-transmitted Flavivirus belonging to the Japanese encephalitis antigenic complex of the Flaviviridae family. Its spread in the Mediterranean basin and the Balkans poses a significant risk to human health and forces public health officials to constantly monitor the virus transmission to ensure prompt application of preventive measures. In this context, predictive tools indicating the areas and periods at major risk of WNV transmission are of paramount importance. Spatial analysis approaches, which use environmental and climatic variables to find suitable habitats for WNV spread, can enhance predictive techniques. Using the Mahalanobis Distance statistic, areas ecologically most suitable for sustaining WNV transmission were identified in the Mediterranean basin and Central Europe. About 270 human and equine clinical cases notified in Italy, Greece, Portugal, Morocco, and Tunisia, between 2008 and 2012, have been considered. The environmental variables included in the model were altitude, slope, night time Land Surface Temperature, Normalized Difference Vegetation Index, Enhanced Vegetation Index, and daily temperature range. Seasonality of mosquito population has been modelled and included in the analyses to produce monthly maps of suitable areas for West Nile Disease. Between May and July, the most suitable areas are located in Tunisia, Libya, Egypt, and North Cyprus. Summer/Autumn months, particularly between August and October, characterize the suitability in Italy, France, Spain, the Balkan countries, Morocco, North Tunisia, the Mediterranean coast of Africa, and the Middle East. The persistence of suitable conditions in December is confined to the coastal areas of Morocco, Tunisia, Libya, Egypt, and Israel.

  6. Linking Tarim Basin sea retreat (west China) and Asian aridification in the late Eocene

    NARCIS (Netherlands)

    Bosboom, R.; Dupont-Nivet, G.; Grothe, A.; Brinkhuis, H.; Villa, G.; Mandic, O.; Stoica, M.; Huang, W.; Yang, W.; Guo, Z.; Krijgsman, W.

    2014-01-01

    The Tarim Basin in western China formed the easternmost margin of a shallow epicontinental sea that extended across Eurasia and was well connected to the western Tethys during the Paleogene. Climate modelling studies suggest that the westward retreat of this sea from Central Asia may have been as

  7. Integrated assessment of groundwater resources in the Oueme Basin, Benin, West Africa

    NARCIS (Netherlands)

    Barthel, R.; Sonneveld, B.G.J.S.; Gotzinger, J.; Keyzer, M.A.; Pande, S.; Printz, A.; Gaiser, T.

    2009-01-01

    An integrated assessment of groundwater resources in Benin, West Africa was performed within the framework of the EC-funded research project RIVERTWIN (www.rivertwin.org). The assessment included a spatial analysis of groundwater relevant parameters taken from more than 4000 wells stored in a

  8. Computation of groundwater resources and recharge in Chithar River Basin, South India.

    Science.gov (United States)

    Subramani, T; Babu, Savithri; Elango, L

    2013-01-01

    Groundwater recharge and available groundwater resources in Chithar River basin, Tamil Nadu, India spread over an area of 1,722 km(2) have been estimated by considering various hydrological, geological, and hydrogeological parameters, such as rainfall infiltration, drainage, geomorphic units, land use, rock types, depth of weathered and fractured zones, nature of soil, water level fluctuation, saturated thickness of aquifer, and groundwater abstraction. The digital ground elevation models indicate that the regional slope of the basin is towards east. The Proterozoic (Post-Archaean) basement of the study area consists of quartzite, calc-granulite, crystalline limestone, charnockite, and biotite gneiss with or without garnet. Three major soil types were identified namely, black cotton, deep red, and red sandy soils. The rainfall intensity gradually decreases from west to east. Groundwater occurs under water table conditions in the weathered zone and fluctuates between 0 and 25 m. The water table gains maximum during January after northeast monsoon and attains low during October. Groundwater abstraction for domestic/stock and irrigational needs in Chithar River basin has been estimated as 148.84 MCM (million m(3)). Groundwater recharge due to monsoon rainfall infiltration has been estimated as 170.05 MCM based on the water level rise during monsoon period. It is also estimated as 173.9 MCM using rainfall infiltration factor. An amount of 53.8 MCM of water is contributed to groundwater from surface water bodies. Recharge of groundwater due to return flow from irrigation has been computed as 147.6 MCM. The static groundwater reserve in Chithar River basin is estimated as 466.66 MCM and the dynamic reserve is about 187.7 MCM. In the present scenario, the aquifer is under safe condition for extraction of groundwater for domestic and irrigation purposes. If the existing water bodies are maintained properly, the extraction rate can be increased in future about 10% to 15%.

  9. Lunar farside volcanism in and around the South Pole-Aitken basin

    Science.gov (United States)

    Pasckert, Jan Hendrik; Hiesinger, Harald; van der Bogert, Carolyn H.

    2018-01-01

    We identified and mapped 129 mare basalt deposits in and around the South Pole-Aitken (SPA) basin, and determined absolute model ages (AMAs) for 101 of these units by performing crater size-frequency distribution (CSFD) measurements. The derived AMAs range from 2.2 Ga to 3.7 Ga, with the youngest deposits within Antoniadi crater and the oldest deposits at Jules Verne crater. Our investigations indicate a major peak in volcanic activity between 3.6 Ga and 3.2 Ga, which is a similar time range as the major volcanic activity on the nearside, and the rest of the farside. However, a second peak in volcanic activity (2.2-2.5 Ga), as observed for the nearside and parts of the farside, is not observed for the mare deposits within the SPA basin. Combining all AMAs derived for farside mare basalts reveals that volcanic activity was more abundant and lasted longer on the nearside than on the farside. We propose that the stripping of insulating crust by the large SPA-forming impact event, in combination with lower amounts of heat producing elements like Th, might be responsible for the reduced volcanic activity in the SPA basin. In addition, we estimated the thicknesses and volumes of the investigated mare deposits. With thicknesses between ∼31 m and ∼273 m and volumes of ∼1 km³ to ∼2630 km³, the mare basalt deposits in and around the SPA basin show a wide range of dimensions, similar to other mare basalts of the near- and farsides. A trend between the AMAs and the estimated volumes was not observed, but the mare deposits within the large northern craters (e.g., Apollo, Ingenii, or Leibnitz) seem to be generally larger and more voluminous than the mare basalt deposits at the center of the SPA basin.

  10. Analysis of meteorological and hydrological droughts in the Niger-South Basin, Nigeria

    Science.gov (United States)

    Oloruntade, Ajayi J.; Mohammad, Thamer A.; Ghazali, Abdul H.; Wayayok, Aimrun

    2017-08-01

    Information gained from drought analysis can serve as the basis for water resources planning and management under the prevailing climate change condition especially at the basin scale. The aim of this work is to apply two meteorological drought indices - Standardized Precipitation Index (SPI), Standardized Precipitation Evapotranspiration Index (SPEI) and a hydrological drought index - Standardized Runoff Index (SRI) to investigate the occurrence of drought in the Niger-South Basin (NSB), a sub-catchment of the Niger River Basin in Nigeria, during the period 1970-2008. The results showed that the period between 1970 and 1981 was dominated by wet conditions; second, from 1982 to 1998, a period of droughts ranging from moderate dry to extreme dry alternated with moderate wet conditions, while the third period beginning from 1999 to 2008 displayed another round of severe droughts sparingly intercepted by occasional moderate wet conditions. High correlation values of between 0.66 (at 3-month scale) and 0.56 (at 12-month scale) show comparativeness in the performance of the two drought indices. For the hydrological drought, a severe drought was observed in 1982 and near normal and moderately wet since 1997. The higher agreement between the SRI and SPEI, suggests that hydrological droughts are more affected by temperature (warming) than precipitation (drying) in the basin. Further analysis of the frequency of the various conditions shows that it has been more of near normal conditions (> 60%), while extremely dry and wet conditions (2% each) have been very rare. However, given the projected global warming conditions, a reversal of the present normal condition might be witnessed in the nearest future, hence, the results of this study can serve as a basis for effective water resources planning and management in the basin.

  11. Rain- vapour isotopic interaction over the south-west coast of India

    Science.gov (United States)

    Palliyil Ravisankar, Lekshmy; Madhavan, Midhun; Rengaswamy, Ramesh

    2015-04-01

    Boundary layer water vapor isotopic composition (δv) is an important factor that controls the isotopic composition of evaporation flux and modulating the δ18O of tree ring cellulose through plant physiological cycle. But due to the difficult sampling procedure for water vapor, δv has rarely been quantified. Since many simple isotopic models require δvas an input, mostly we assume that the water vapor is in isotopic equilibrium with δof monthly rain (δr). Here we present simultaneous observations of water vapour (~ 300 samples) and rainfall (~200 samples) isotopic ratios from two stations in the south-west coast of India (both the stations are located in the west of Western Ghats), sampled during April- October, 2012. Daily rain water and water vapour (cryogenic trapping method) were collected according to the IAEA protocol and the isotopic analyses (D and 18O) were done using a Thermo Fisher Delta V+ Isotope Ratio Mass Spectrometer. We observe that, water vapour and rain are close to the equilibrium values during pre monsoon (April-May, ɛ = δr - δv= 8.9 ± 1.4 ), summer monsoon (June-September, ɛ = 9.0 ± 1.8 ) and North- East (NE) monsoon (October, ɛ = 7.9 ± 2.9 ) seasons. However, some individual rain events show more deviations from the equilibrium values. NE monsoon rainfall and water vapour are isotopically more depleted in 18O compared to the pre monsoon and summer monsoon seasons, in which the depletion is more in rain (~4 ) compared to water vapour (~2 ). This is because of the 18O enrichment of ground level vapour due to local evapo- transpiration (stations are at the leeward side of the Ghats), while rainfall is directly formed from the NE monsoon clouds which is more depleted in 18O. These results will be useful for the interpretation of δ18O of tree rings from south west.

  12. Comparison of West African and Congo Basin monkeypox viruses in BALB/c and C57BL/6 mice.

    Directory of Open Access Journals (Sweden)

    Christina L Hutson

    2010-01-01

    Full Text Available Although monkeypox virus (MPXV studies in wild rodents and non-human primates have generated important knowledge regarding MPXV pathogenesis and inferences about disease transmission, it might be easier to dissect the importance of virulence factors and correlates of protection to MPXV in an inbred mouse model. Herein, we compared the two clades of MPXV via two routes of infection in the BALB/c and C57BL/6 inbred mice strains. Our studies show that similar to previous animal studies, the Congo Basin strain of MPXV was more virulent than West African MPXV in both mouse strains as evidenced by clinical signs. Although animals did not develop lesions as seen in human MPX infections, localized signs were apparent with the foot pad route of inoculation, primarily in the form of edema at the site of inoculation; while the Congo Basin intranasal route of infection led to generalized symptoms, primarily weight loss. We have determined that future studies with MPXV and laboratory mice would be very beneficial in understanding the pathogenesis of MPXV, in particular if used in in vivo imaging studies. Although this mouse model may not suffice as a model of human MPX disease, with an appropriate inbred mouse model, we can unravel many unknown aspects of MPX pathogenesis, including virulence factors, disease progression in rodent hosts, and viral shedding from infected animals. In addition, such a model can be utilized to test antivirals and the next generation of orthopoxvirus vaccines for their ability to alter the course of disease.

  13. Cambarus (Puncticambarus) smilax, a new species of crayfish (Crustacea: Decapoda: Cambaridae) from the Greenbrier River basin of West Virginia

    Science.gov (United States)

    Loughman, Zachary J.; Simon, Thomas P.; Welsh, Stuart A.

    2011-01-01

    Cambarus (Puncticambarus) smilax is a stream-dwelling crayfish that appears to be endemic to the Greenbrier River basin in the Valley and Ridge province of West Virginia. Within the Greenbrier system it occurs primarily in tributaries to the Greenbrier mainstem, with stable populations in the East and West Fork, and Thorny, Knapp, and Deer creeks. The new species is morphologically most similar to C. (P.) robustus, from which it can be distinguished by a combination of the following characters: adult palm length comprising 73–76% of palm width as opposed to 63–70% in C. (P.)robustus; ventral surface of chela of cheliped with 0–2 subpalmar tubercles compared to 3–6 subpalmar tubercles in C. (P.) robustus; lack of tubercles on the dorsal surface of chela; longer, more tapering, less rectangular rostrum (47–52% rostrum width/length ratio) compared to C. (P.) robustusshorter, less tapering rectangular rostrum (54–63% rostrum width/length ratio); and the central projection of the form-I male gonopod curved ≤90 degrees to the shaft.

  14. Geochemistry and origins of natural gases in the Yinggehai and Qiongdongnan basins, offshore South China Sea

    Energy Technology Data Exchange (ETDEWEB)

    Baojia Huang [State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Guangdong (China); CNOOC Nanhai West Research Institute, Guangdong (China); Xianming Xiao [State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Guangdong (China); Xuxuan Li [CNOOC Nanhai West Research Institute, Guangdong (China)

    2003-07-01

    Four gas fields and a number of gas-bearing structures have been discovered in the Yinggehai and Qiongdongnan basins offshore South China Sea. Chemical and isotopic data indicate the presence of at least three genetic groups of gases in these basins: biogenic gas, thermogenic gas, and gases with mixed origin. Thermogenic gases produced from the Yacheng field are characterized by relatively high contents of benzene and toluene, relatively low {delta}{sup 13}C values of toluene, and high abundance of bicadinanes and oleanane in the associated condensates, showing good correlation with the coal-bearing sequence of the Yacheng Formation in the Qiongdongnan Basin. In contrast, the gases from the DF1-1 and LD gas fields contain high amounts of N{sub 2} and CO{sub 2}, low to moderate amounts of benzene and toluene, with relatively high {delta}{sup 13}C values of toluene. These characteristics correlate well with the Miocene neritic shales in the Yinggehai Basin. Analyses on potential source rock samples indicate excellent gas source potential for both the coal-bearing sequence in the Yacheng Formation and the Miocene neritic shales containing type III{approx}II2 kerogens. As the result of recent rapid subsidence and sedimentation, high temperature and overpressure systems are well developed in the Yinggehai and Qiongdongnan basins. The rapid heating resulted in advanced maturation of organic matter deposited in normally pressured and overpressured strata, whereas the strongly overpressured systems led to retarded organic matter maturation, postponing the time when the source rocks reached peak gas generation. Results of 1-D modeling indicate that the coal-bearing Yacheng Formation in the Yacheng Formation in the Yacheng Sag reached peak gas generation during mid Miocene-Pliocene time, after the deposition of upper Oligocene to lower Miocene reservoir rocks. The lower-mid Miocene marine shales reached their peak gas generation stage during the Pliocene-Quaternary in the

  15. Moonrise: Sampling the South Pole-Aitken Basin to Address Problems of Solar System Significance

    Science.gov (United States)

    Zeigler, R. A.; Jolliff, B. L.; Korotev, R. L.; Shearer, C. K.

    2016-01-01

    A mission to land in the giant South Pole-Aitken (SPA) Basin on the Moon's southern farside and return a sample to Earth for analysis is a high priority for Solar System Science. Such a sample would be used to determine the age of the SPA impact; the chronology of the basin, including the ages of basins and large impacts within SPA, with implications for early Solar System dynamics and the magmatic history of the Moon; the age and composition of volcanic rocks within SPA; the origin of the thorium signature of SPA with implications for the origin of exposed materials and thermal evolution of the Moon; and possibly the magnetization that forms a strong anomaly especially evident in the northern parts of the SPA basin. It is well known from studies of the Apollo regolith that rock fragments found in the regolith form a representative collection of many different rock types delivered to the site by the impact process (Fig. 1). Such samples are well documented to contain a broad suite of materials that reflect both the local major rock formations, as well as some exotic materials from far distant sources. Within the SPA basin, modeling of the impact ejection process indicates that regolith would be dominated by SPA substrate, formed at the time of the SPA basin-forming impact and for the most part moved around by subsequent impacts. Consistent with GRAIL data, the SPA impact likely formed a vast melt body tens of km thick that took perhaps several million years to cool, but that nonetheless represents barely an instant in geologic time that should be readily apparent through integrated geochronologic studies involving multiple chronometers. It is anticipated that a statistically significant number of age determinations would yield not only the age of SPA but also the age of several prominent nearby basins and large craters within SPA. This chronology would provide a contrast to the Imbrium-dominated chronology of the nearside Apollo samples and an independent test of

  16. Key pluvial parameters in assessing rainfall erosivity in the south-west development region, Romania

    Science.gov (United States)

    Dumitraşcu, Monica; Dragotă, Carmen-Sofia; Grigorescu, Ines; Dumitraşcu, Costin; Vlăduţ, Alina

    2017-06-01

    Located in the south-western part of Romania, the south-west development region overlaps the main relief forms: the Carpathians mountains, the Getic Subcarpathians, the Getic piedmont, the Romanian plain and the Danube valley. The study aims at providing an overview on the main pluvial parameters and their role in assessing rainfall erosivity in the study area. The authors assessed the occurrence, frequency and magnitude of some of the most significant pluvial parameters and their impact on the climatic aggressiveness in the study area. Thus, the monthly and annual mean and extreme climatic values for different rainfall related parameters (e.g., maximum amounts of precipitation/24 hr, heavy rainfall), as well as relevant indices and indicators for pluvial aggressiveness (Fournier, Fournier Modified, Angot) were calculated. The rainfall erosivity was assessed in order to provide both the spatial distribution of the triggering extreme weather phenomena and the resulted intensity classes for the analysed indices and indicators. The authors used long-term precipitation records (1961-2010) for the selected relevant meteorological stations distributed throughout all analysed relief units.

  17. Survey of the livestock ticks of the North West province, South Africa

    Directory of Open Access Journals (Sweden)

    Arthur M. Spickett

    2011-02-01

    Full Text Available Ticks, as vectors of disease and damage agents, impact directly and indirectly on the economy of the livestock industry in southern Africa. This study surveyed the occurrence and distribution of ticks infesting livestock across the North West province, South Africa. During three phases in consecutive years, officers of the provincial Veterinary Department collected specimens monthly from livestock hosts at specified sites across the province. Data analysis constituted the fourth phase of the study. A total of 1090 collections from 265 sites yielded 42 566 tick specimens, comprising 22 different tick species (18 ixodids, 4 argasids. The specimens represent all of the major tick vectors of disease that occur in South Africa. The major tick-borne diseases (i.e. heartwater, both African and Asiatic bovine babesiosis and anaplasmosis were found to be prevalent mainly in the north-eastern region of the province, which also displayed the highest tick species diversity. The central region appears transitory to some of the major vectors. Although some tick species were contained within specific regions, others were widespread across the province. Associated serology data show that most herds sampled in areas endemic for babesiosis and anaplasmosis in the north-eastern region are endemically unstable and at risk to these tick-borne diseases should vector control measures become ineffective.

  18. Dependence between sea surge, river flow and precipitation in south and west Britain

    Directory of Open Access Journals (Sweden)

    C. Svensson

    2004-01-01

    Full Text Available Estuaries around Great Britain may be at heightened risk of flooding because of the simultaneous occurrence of extreme sea surge and river flow, both of which may be caused by mid-latitude cyclones. A measure especially suited for extremes was employed to estimate dependence between river flow and sea surge. To assist in the interpretation of why flow-surge dependence occurs in some areas and not in others, the dependence between precipitation and surge and between precipitation and river flow was also studied. Case studies of the meteorological situations leading to high surges and/or river flows were also carried out. The present study concerns catchments draining to the south and west coasts of Great Britain. Statistically significant dependence between river flow and daily maximum sea surge may be found at catchments spread along most of this coastline. However, higher dependence is generally found in catchments in hilly areas with a southerly to westerly aspect. Here, precipitation in south-westerly airflow, which is generally the quadrant of prevailing winds, will be enhanced orographically as the first higher ground is encountered. The sloping catchments may respond quickly to the abundant rainfall and the flow peak may arrive in the estuary on the same day as a large sea surge is produced by the winds and low atmospheric pressure associated with the cyclone. There are three regions where flow-surge dependence is strong: the western part of the English south coast, southern Wales and around the Solway Firth. To reduce the influence of tide-surge interaction on the dependence analysis, the dependence between river flow and daily maximum surge occurring at high tide was estimated. The general pattern of areas with higher dependence is similar to that using the daily maximum surge. The dependence between river flow and daily maximum sea surge is often strongest when surge and flow occur on the same day. The west coast from Wales and

  19. Acceptance testing of the eddy current probes for measurement of aluminum hydroxide coating thickness on K West Basin fuel elements

    Energy Technology Data Exchange (ETDEWEB)

    Pitner, A.L.

    1998-08-21

    During a recent visual inspection campaign of fuel elements stored in the K West Basin, it was noted that fuel elements contained in sealed aluminum canisters had a heavy translucent type coating on their surfaces (Pitner 1997a). Subsequent sampling of this coating in a hot cell (Pitner 1997b) and analysis of the material identified it as aluminum hydroxide. Because of the relatively high water content of this material, safety related concerns are raised with respect to long term storage of this fuel in Multi-Canister Overpacks (MCOs). A campaign in the basin is planned to demonstrate whether this coating can be removed by mechanical brushing (Bridges 1998). Part of this campaign involves before-and-after measurements of the coating thickness to determine the effectiveness of coating removal by the brushing machine. Measurements of the as-deposited coating thickness on multiple fuel elements are also expected to provide total coating inventory information needed for MCO safety evaluations. The measurement technique must be capable of measuring coating thicknesses on the order of several mils, with a measurement accuracy of 0.5 mil. Several different methods for quantitatively measuring these thin coatings were considered in selecting the most promising approach. Ultrasonic measurement was investigated, but it was determined that due to the thin coating depth and the high water content of the material, the signal would likely pass directly through to the cladding without ever sensing the coating surface. X-ray fluorescence was also identified as a candidate technique, but would not work because the high gamma background from the irradiated fuel would swamp out the low energy aluminum signal. Laser interferometry could possibly be applied, but considerable development would be required and it was considered to be high risk on a short term basis. The consensus reached was that standard eddy current techniques for coating thickness measurement had the best chance for

  20. Occurrence of 1 ka-old corals on an uplifted reef terrace in west Luzon, Philippines: Implications for a prehistoric extreme wave event in the South China Sea region

    Science.gov (United States)

    Ramos, Noelynna T.; Maxwell, Kathrine V.; Tsutsumi, Hiroyuki; Chou, Yu-Chen; Duan, Fucai; Shen, Chuan-Chou; Satake, Kenji

    2017-12-01

    Recent 230Th dating of fossil corals in west Luzon has provided new insights on the emergence of late Quaternary marine terraces that fringe west Luzon Island facing the Manila Trench. Apart from regional sea level changes, accumulated uplift from aseismic and seismic processes may have influenced the emergence of sea level indicators such as coral terraces and notches. Varied elevations of middle-to-late Holocene coral terraces along the west Luzon coasts reveal the differential uplift that is probably associated with the movement of local onland faults or upper-plate structures across the Manila Trench forearc basin. In Badoc Island, offshore west of Luzon mainland, we found notably young fossil corals, dated at 945.1 ± 4.6 years BP and 903.1 ± 3.9 years BP, on top of a 5-m-high reef platform. To constrain the mechanism of emergence or emplacement of these fossil corals, we use field geomorphic data and wave inundation models to constrain an extreme wave event that affected west Luzon about 1000 years ago. Our preliminary tectonic and tsunami models show that a megathrust rupture will likely lead to subsidence of a large part of the west Luzon coast, while permanent coastal uplift is attributed to an offshore upper-plate rupture in the northern Manila Trench forearc region. The modeled source fault ruptures and tsunami lead to a maximum wave height of more than 3 m and inundation distance as far as 2 km along the coasts of western and northern Luzon. While emplacement of coral boulders by an unusually strong typhoon is also likely, modeled storm surge heights along west Luzon do not exceed 2 m even with Typhoon Haiyan characteristics. Whether tsunami or unusually strong typhoon, the occurrence of a prehistoric extreme wave event in west Luzon remains an important issue in future studies of coastal hazards in the South China Sea region.

  1. Characteristics of Droughts in South Africa: A Case Study of Free State and North West Provinces

    Directory of Open Access Journals (Sweden)

    Christina M. Botai

    2016-10-01

    Full Text Available The Free State (FS and North West (NW Provinces are often hard hit by droughts with impacts on water availability, farm production and livestock holdings. The South African government declared the two Provinces drought disaster areas in the 2015/2016 hydrological year. This is a major drawback, since both the Provinces play an important role to South African economy as they are a haven to agricultural production and have major water reservoirs in South Africa. This study was undertaken to investigate the historical evolution of drought within the FS and NW Provinces over the past 30 years. The Standardized Precipitation Index (SPI and Standardized Precipitation Evapotranspiration Index (SPEI calculated based on monthly meteorological data from 14 weather/climate stations within the FS and NW Provinces were used to explore and characterize variation in drought intensity, duration, frequency and severity in FS and NW Provinces during 1985–2015. Results indicate that there exist localized positive and negative trends with spatial dependence across the selected stations. In particular, about 60% of the weather stations exhibiting a decreasing trend are located in FS Province, suggesting that FS has being experiencing increasing drought during the analyzed period compared to NW Province. Results from the analysis of drought evaluation indicators (DEIs calculated from SPEI suggest that drought severity and frequency was more pronounced in FS while the intensity of the drought was more in NW Province during 1985–2015. In addition, based on SPEI calculations, moderate drought occurrences increased during 1985–1994 and 1995–2004 periods and decreased thereafter (2005–2015 in both Provinces. Drought classification based on parameters derived from SPEI produced similar results for mild drought occurrences during the same time scales.

  2. Towards a South Asia Land Data Assimilation System: first results for transboundary basins

    Science.gov (United States)

    Zaitchik, B. F.; Ghatak, D.; Toll, D. L.; Searby, N. D.; Limaye, A. S.; Peters-Lidard, C. D.; Bajracharya, B.; Shrestha, B. R.; Iceland, C.; Narula, K.; Lee, S.; Mourad, B.; Doorn, B.

    2014-12-01

    South Asia faces a remarkably complex and diverse set of hydrologic stresses, including melting glaciers, variable snowpack, intensively utilized transboundary rivers, rapid groundwater depletion due to irrigation, flood and drought hazard, and rapidly changing land use/cover and climate conditions. The management and prediction challenges posed by these conditions are compounded by the sparseness of in situ monitoring sites, particularly in headwaters regions, and a lack of open sharing of hydrometeorological data across national boundaries. As a result, uncertainties in availability in a situation of rising demands are leading to increasing competing and exploitive use of a limited resource, being experienced at various scales. An open water information system for decision support is an absolute necessity. In order to provide an open and spatially complete water information system for decision support across the region, we are implementing a customized Land Data Assimilation System (LDAS) designed to provide best-available estimates of hydrologic states and fluxes across South Asia, both retrospectively and in near-real time. The LDAS merges advanced land surface models with satellite-derived and in situ observations. In the case of South Asia, multiple satellite-derived hydrological fields are relevant to complete water balance analysis, including precipitation from multiple sources (e.g., TRMM, CHIRPS, GPM), water storage anomalies from GRACE, thermal infrared evapotranspiration estimates, and snowpack characteristics from visible and microwave sensors. Each of these observation types can either be ingested to South Asia LDAS or used as an independent observation for comparison. Here we present the first results of this South Asian Land Data Assimilation System, with a focus on complete water balance analysis for selected river basins in South Asia.

  3. Geomorphological Investigation of the Atchafalaya Basin, Area West, Atchafalaya Delta, and Terrebonne Marsh. Volume 1.

    Science.gov (United States)

    1986-04-01

    SUPPLEMENTARY NOTES Available from National Technical Information Service, 5285 Port Royal Road, Springfield, Virginia 22161. IN. KEY WORDS FCDoI.o. o,, ,- i...quadrangles presented in Volume II. Approach 4. During this investigation an attempt was made to extrik t teco t e st amount of geomorphic information ...flank of the Teche Ridge (Lakes Fausse Point, Grand, and Six Mile) has masked former distributary channels in the western Atchafalaya Basin area

  4. Hydrological Responses to Land Use/Cover Changes in the Olifants Basin, South Africa

    Directory of Open Access Journals (Sweden)

    Charles Gyamfi

    2016-12-01

    Full Text Available This paper discusses the hydrological impacts of land use changes on the Olifants Basin in South Africa using the Soil and Water Assessment Tool (SWAT. A three-phase land use scenario (2000, 2007 and 2013 employing the “fix-changing” method was used to simulate the hydrology of the Olifants Basin. Changes in land uses were related to different hydrological responses through a multi-regression analysis to quantify the effects of land use changes. Results reveal that from 2000 to 2013, a 31.6% decrease in rangeland with concomitant increases in agriculture lands (20.1%, urban areas (10.5% and forest (0.7% led to a 46.97% increase in surface runoff generation. Further, urbanization was revealed as the strongest contributor to increases in surface runoff generation, water yield and evapotranspiration (ET. ET was found to be a key water availability determinant as it has a high negative impact on surface runoff and water yield. Urbanization and agriculture were the most essential environmental factors influencing water resources of the basin with ET playing a dominant role. The output of the paper provides a simplistic approach of evaluating the impacts of land use changes on water resources. The tools and methods used are relevant for policy directions on water resources planning and adaptation of strategies.

  5. Sequence stratigraphy and hydrocarbon potential of the Phu Khanh Basin offshore central Vietnam, South China Sea

    Energy Technology Data Exchange (ETDEWEB)

    Lee, G.H. [Kunsan National Univ. (Korea, Republic of); Watkins, J.S. [Texas A& M Univ., College Station, TX (United States)

    1996-12-31

    The Phu Khanh Basin offshore central Vietnam is one of the few untested basins on the Vietnam margin of the South China Sea. Analysis of over 1,600 km of multi-channel seismic reflection data indicates that the Phu Khanh Basin follows a typical rift-margin order: faulted basement, synrift sedimentation, a breakup unconformity, and postrift sedimentation. Postrift sedimentation consists of a transgressive phase characterized by ramp-like depositional geometries followed by a regressive phase characterized by prograding sequences. An early middle Miocene unconformity separates these two phases. During the transgressive phase rising sea level provided favorable conditions for carbonate buildup development. The regressive interval contains a number of third-order depositional sequences composed of seismically resolvable lowstand, highstand, and rarely, transgressive systems tracts. Lacustrine sediments deposited in graben and half-graben lakes during the rifting stage are probably the principal source rocks. Fractured and/or weathered basement, carbonate complexes, basinfloor fans, and shallows water sands may have good reservoir quality. Potential traps include basement hills, carbonate complexes, fault taps, and stratigraphic traps within lowstand systems tracts. Hydrocarbon indicators such as flat spots, bright spots, gas chimneys with gas mounds on the seafloor occur at a number of locations.

  6. Sequence stratigraphy and hydrocarbon potential of the Phu Khanh Basin offshore central Vietnam, South China Sea

    Energy Technology Data Exchange (ETDEWEB)

    Lee, G.H. (Kunsan National Univ. (Korea, Republic of)); Watkins, J.S. (Texas A M Univ., College Station, TX (United States))

    1996-01-01

    The Phu Khanh Basin offshore central Vietnam is one of the few untested basins on the Vietnam margin of the South China Sea. Analysis of over 1,600 km of multi-channel seismic reflection data indicates that the Phu Khanh Basin follows a typical rift-margin order: faulted basement, synrift sedimentation, a breakup unconformity, and postrift sedimentation. Postrift sedimentation consists of a transgressive phase characterized by ramp-like depositional geometries followed by a regressive phase characterized by prograding sequences. An early middle Miocene unconformity separates these two phases. During the transgressive phase rising sea level provided favorable conditions for carbonate buildup development. The regressive interval contains a number of third-order depositional sequences composed of seismically resolvable lowstand, highstand, and rarely, transgressive systems tracts. Lacustrine sediments deposited in graben and half-graben lakes during the rifting stage are probably the principal source rocks. Fractured and/or weathered basement, carbonate complexes, basinfloor fans, and shallows water sands may have good reservoir quality. Potential traps include basement hills, carbonate complexes, fault taps, and stratigraphic traps within lowstand systems tracts. Hydrocarbon indicators such as flat spots, bright spots, gas chimneys with gas mounds on the seafloor occur at a number of locations.

  7. Water-quality data for the South Umpqua River Basin, Oregon, 1990-92

    Science.gov (United States)

    Anderson, Chauncey W.; Tanner, Dwight Q.; Lee, Douglas B.

    1994-01-01

    Data are presented from a study of algal and nutrient dynamics in the South Umpqua River Basin in southwestern Oregon during summer, low-flow periods from September 1990 to October 1992. The study was done to assist local and state regulatory agencies in determining total maximum daily loads of nutrients for the basin in order to maintain dissolved oxygen greater than 90 percent of saturation and pH less than 8.5 units. Fifty-one sites, including South Umpqua River, tributaries, and wastewater-treatment plant effluents, were sampled during this period. The study included collection of 537 samples or measurements from surface-water sites, 315 samples of wastewater-treatment-plant effluents, 1,262 field measurements during intensive studies within individual reaches, daily mean flow data from 6 streamflow gaging stations, daily mean water-quality data from 2 fixed-station monitors recording hourly, and various biological data including bacteria, algae and macro invertebrates in the river. Also included are notes from field reconnaissance surveys and a compilation of quality-assurance data.

  8. Radiogenic heat production in sedimentary rocks of the Gulf of Mexico Basin, south Texas

    Science.gov (United States)

    McKenna, T.E.; Sharp, J.M.

    1998-01-01

    Radiogenic heat production within the sedimentary section of the Gulf of Mexico basin is a significant source of heat. Radiogenic heat should be included in thermal models of this basin (and perhaps other sedimentary basins). We calculate that radiogenic heat may contribute up to 26% of the overall surface heat-flow density for an area in south Texas. Based on measurements of the radioactive decay rate of ??-particles, potassium concentration, and bulk density, we calculate radiogenic heat production for Stuart City (Lower Cretaceous) limestones, Wilcox (Eocene) sandstones and mudrocks, and Frio (Oligocene) sandstones and mudrocks from south Texas. Heat production rates range from a low of 0.07 ?? 0.01 ??W/m3 in clean Stuart City limestones to 2.21 ?? 0.24??W/m3 in Frio mudrocks. Mean heat production rates for Wilcox sandstones, Frio sandstones, Wilcox mudrocks, and Frio mudrocks are 0.88, 1.19, 1.50, and 1.72 ??W/m3, respectively. In general, the mudrocks produce about 30-40% more heat than stratigraphically equivalent sandstones. Frio rocks produce about 15% more heat than Wilcox rocks per unit volume of clastic rock (sandstone/mudrock). A one-dimensional heat-conduction model indicates that this radiogenic heat source has a significant effect on subsurface temperatures. If a thermal model were calibrated to observed temperatures by optimizing basal heat-flow density and ignoring sediment heat production, the extrapolated present-day temperature of a deeply buried source rock would be overestimated.Radiogenic heat production within the sedimentary section of the Gulf of Mexico basin is a significant source of heat. Radiogenic heat should be included in thermal models of this basin (and perhaps other sedimentary basins). We calculate that radiogenic heat may contribute up to 26% of the overall surface heat-flow density for an area in south Texas. Based on measurements of the radioactive decay rate of ??-particles, potassium concentration, and bulk density, we

  9. Detrital zircon (U-Th)/(He-Pb) double-dating constraints on provenance and foreland basin evolution of the Ainsa Basin, south-central Pyrenees, Spain

    Science.gov (United States)

    Thomson, Kelly D.; Stockli, Daniel F.; Clark, Julian D.; Puigdefàbregas, Cai; Fildani, Andrea

    2017-07-01

    South central Pyrenean foreland basin fill preserves the eroded remnants of the early stages of fold-thrust belt evolution and topographic growth. Specifically, the Eocene Hecho Group in the Ainsa Basin contains a succession of turbiditic channels and levees deposited in the transition zone between the fluvial-deltaic and deep marine depozones. Detailed isotopic provenance analyses allow for the reconstruction of sediment sources of the ancient sediment routing systems. This study presents 2332 new detrital zircon (DZ) U-Pb ages and 246 new DZ double-dated (U-Th)/(He-Pb) ages from 19 turbiditic and fluvio-deltatic sandstones in the Ainsa Basin. These data indicate a progressive provenance shift from Cadomian/Caledonian plutonic and metamorphic rocks of the eastern Pyrenees to Variscan plutonic rocks in the central Pyrenees. Minor sediment contributions from sources located to the S and SE of the basin are seen throughout the section. New DZ (U-Th)/He results identify four main cooling events: Pyrenean orogenesis ( 56 Ma), initial basin inversion ( 80 Ma), Cretaceous rifting ( 100 Ma), and pre-Mesozoic cooling ages related to earlier tectonic phases. This study imposes new constraints on the paleogeographic evolution of the Pyrenees and illustrates that high-frequency fluctuations in sediment delivery processes and sediment routing introduce superimposed noise upon the basin-scale long-term provenance evolution during orogenesis.

  10. Mesozoic carbonate-siliciclastic platform to basin systems of a South Tethyan margin (Egypt, East Mediterranean)

    Science.gov (United States)

    Tassy, Aurélie; Crouzy, Emmanuel; Gorini, Christian; Rubino, Jean-Loup

    2015-04-01

    The Mesozoïc Egyptian margin is the south margin of a remnant of the Neo-Tethys Ocean, at the African northern plate boundary. East Mediterranean basin developed during the late Triassic-Early Jurassic rifting with a NW-SE opening direction (Frizon de Lamotte et al., 2011). During Mesozoïc, Egypt margin was a transform margin with a NW-SE orientation of transform faults. In the Eastern Mediterranean basin, Mesozoïc margins are characterized by mixed carbonate-siliciclastics platforms where subsidence and eustacy are the main parameters controlling the facies distribution and geometries of the platform-to-basin transition. Geometries and facies on the platform-slope-basin system, today well constrained on the Levant area, where still poorly known on the Egyptian margin. Geometries and stratigraphic architecture of the Egyptian margin are revealed, thanks to a regional seismic and well data-base provided by an industrial-academic group (GRI, Total). The objective is to understand the sismostratigraphic architecture of the platform-slope-basin system in a key area from Western Desert to Nile delta and Levant margin. Mapping of the top Jurassic and top Cretaceous show seismic geomorphology of the margin, with the cartography of the hinge line from Western Desert to Sinaï. During the Jurassic, carbonate platform show a prograding profile and a distally thickening of the external platform, non-abrupt slope profiles, and palaeovalleys incisions. Since the Cretaceous, the aggrading and retrograding mixed carbonate-siliciclastic platform show an alternation of steep NW-SE oblique segments and distally steepened segments. These structures of the platform edge are strongly controlled by the inherited tethyan transform directions. Along the hinge line, embayments are interpreted as megaslides. The basin infilling is characterised by an alternation of chaotic seismic facies and high amplitude reflectors onlaping the paleoslopes. MTC deposits can mobilize thick sedimentary

  11. Trends and Projections of Climatic Extremes in the Black Volta Basin, West Africa: Towards Climate Change Adaptation.

    Science.gov (United States)

    Aziz, F.

    2015-12-01

    The water resources of the Black Volta Basin in West Africa constitute a major resource for the four countries (Burkina Faso, Ghana, Côte d'Ivoire, Mali) that share it. For Burkina Faso and Ghana, the river is the main natural resource around which the development of the diverse sectors of the two economies is built. Whereas Ghana relies heavily on the river for energy, land-locked Burkina Faso continuously develops the water for agricultural purposes. Such important role of the river makes it an element around which there are potential conflicts: either among riparian countries or within the individual countries themselves. This study documents the changes in temperature and precipitation extremes in the Black Volta Basin region for the past (1981-2010) and makes projections for the mid-late 21st century (2051-2080) under two emission scenarios; RCP 2.6 and RCP 8.5. The Expert Team on Climate Change Detection and Indices (ETCCDI) temperature- and precipitation-based indices are computed with the RClimdex software. Observed daily records and downscaled CORDEX data of precipitation and maximum and minimum temperatures are used for historical and future trend analysis respectively. In general low emission scenarios show increases in the cold extremes. The region shows a consistent pattern of trends in hot extremes for the 1990's. An increasing trend in hot extremes is expected in the future under RCP 8.5 while RCP 2.5 shows reductions in hot extremes. Regardless of the emission scenario, projections show more frequent hot nights in the 21st century. Generally, the region shows variability in trends for future extreme precipitation indices with only a few of the trends being statistically significant (5% level). Results obtained provide a basic and first step to understanding how climatic extremes have been changing in the Volta Basin region and gives an idea of what to expect in the future. Such studies will also help in making informed decisions on water management

  12. Geologic Controls of Hydrocarbon Occurrence in the Appalachian Basin in Eastern Tennessee, Southwestern Virginia, Eastern Kentucky, and Southern West Virginia

    Energy Technology Data Exchange (ETDEWEB)

    Hatcher, Robert D

    2005-11-30

    This report summarizes the accomplishments of a three-year program to investigate the geologic controls of hydrocarbon occurrence in the southern Appalachian basin in eastern Tennessee, southwestern Virginia, eastern Kentucky, and southern West Virginia. The project: (1) employed the petroleum system approach to understand the geologic controls of hydrocarbons; (2) attempted to characterize the P-T parameters driving petroleum evolution; (3) attempted to obtain more quantitative definitions of reservoir architecture and identify new traps; (4) is worked with USGS and industry partners to develop new play concepts and geophysical log standards for subsurface correlation; and (5) geochemically characterized the hydrocarbons (cooperatively with USGS). Third-year results include: All project milestones have been met and addressed. We also have disseminated this research and related information through presentations at professional meetings, convening a major workshop in August 2003, and the publication of results. Our work in geophysical log correlation in the Middle Ordovician units is bearing fruit in recognition that the criteria developed locally in Tennessee and southern Kentucky are more extendible than anticipated earlier. We have identified a major 60 mi-long structure in the western part of the Valley and Ridge thrust belt that has been successfully tested by a local independent and is now producing commercial amounts of hydrocarbons. If this structure is productive along strike, it will be one of the largest producing structures in the Appalachians. We are completing a more quantitative structural reconstruction of the Valley and Ridge and Cumberland Plateau than has been made before. This should yield major dividends in future exploration in the southern Appalachian basin. Our work in mapping, retrodeformation, and modeling of the Sevier basin is a major component of the understanding of the Ordovician petroleum system in this region. Prior to our

  13. Dark ice dynamics of the south-west Greenland Ice Sheet

    Directory of Open Access Journals (Sweden)

    A. J. Tedstone

    2017-11-01

    Full Text Available Runoff from the Greenland Ice Sheet (GrIS has increased in recent years due largely to changes in atmospheric circulation and atmospheric warming. Albedo reductions resulting from these changes have amplified surface melting. Some of the largest declines in GrIS albedo have occurred in the ablation zone of the south-west sector and are associated with the development of dark ice surfaces. Field observations at local scales reveal that a variety of light-absorbing impurities (LAIs can be present on the surface, ranging from inorganic particulates to cryoconite materials and ice algae. Meanwhile, satellite observations show that the areal extent of dark ice has varied significantly between recent successive melt seasons. However, the processes that drive such large interannual variability in dark ice extent remain essentially unconstrained. At present we are therefore unable to project how the albedo of bare ice sectors of the GrIS will evolve in the future, causing uncertainty in the projected sea level contribution from the GrIS over the coming decades. Here we use MODIS satellite imagery to examine dark ice dynamics on the south-west GrIS each year from 2000 to 2016. We quantify dark ice in terms of its annual extent, duration, intensity and timing of first appearance. Not only does dark ice extent vary significantly between years but so too does its duration (from 0 to > 80 % of June–July–August, JJA, intensity and the timing of its first appearance. Comparison of dark ice dynamics with potential meteorological drivers from the regional climate model MAR reveals that the JJA sensible heat flux, the number of positive minimum-air-temperature days and the timing of bare ice appearance are significant interannual synoptic controls. We use these findings to identify the surface processes which are most likely to explain recent dark ice dynamics. We suggest that whilst the spatial distribution of dark ice is best explained by

  14. Dark ice dynamics of the south-west Greenland Ice Sheet

    Science.gov (United States)

    Tedstone, Andrew J.; Bamber, Jonathan L.; Cook, Joseph M.; Williamson, Christopher J.; Fettweis, Xavier; Hodson, Andrew J.; Tranter, Martyn

    2017-11-01

    Runoff from the Greenland Ice Sheet (GrIS) has increased in recent years due largely to changes in atmospheric circulation and atmospheric warming. Albedo reductions resulting from these changes have amplified surface melting. Some of the largest declines in GrIS albedo have occurred in the ablation zone of the south-west sector and are associated with the development of dark ice surfaces. Field observations at local scales reveal that a variety of light-absorbing impurities (LAIs) can be present on the surface, ranging from inorganic particulates to cryoconite materials and ice algae. Meanwhile, satellite observations show that the areal extent of dark ice has varied significantly between recent successive melt seasons. However, the processes that drive such large interannual variability in dark ice extent remain essentially unconstrained. At present we are therefore unable to project how the albedo of bare ice sectors of the GrIS will evolve in the future, causing uncertainty in the projected sea level contribution from the GrIS over the coming decades. Here we use MODIS satellite imagery to examine dark ice dynamics on the south-west GrIS each year from 2000 to 2016. We quantify dark ice in terms of its annual extent, duration, intensity and timing of first appearance. Not only does dark ice extent vary significantly between years but so too does its duration (from 0 to > 80 % of June-July-August, JJA), intensity and the timing of its first appearance. Comparison of dark ice dynamics with potential meteorological drivers from the regional climate model MAR reveals that the JJA sensible heat flux, the number of positive minimum-air-temperature days and the timing of bare ice appearance are significant interannual synoptic controls. We use these findings to identify the surface processes which are most likely to explain recent dark ice dynamics. We suggest that whilst the spatial distribution of dark ice is best explained by outcropping of particulates from

  15. Pattern of sudden death at Ladoke Akintola University of Technology Teaching Hospital, Osogbo, South West Nigeria

    Directory of Open Access Journals (Sweden)

    Akinwusi PO

    2013-06-01

    Full Text Available Patience Olayinka Akinwusi,1,2 Akinwumi Oluwole Komolafe,3 Olanrewaju Olayinka Olayemi,2 Adeleye Abiodun Adeomi41Department of Medicine, College of Health Sciences, Osun State University, 2Department of Medicine, LAUTECH Teaching Hospital, Osogbo, 3Department of Morbid Anatomy, Obafemi Awolowo University Teaching, Hospitals Complex, Ile-Ife, Osun State, 4Department of Community Medicine, LAUTECH Teaching Hospital, Ogbomoso, Oyo State, NigeriaBackground: The purpose of this study was to determine the etiology and epidemiologic characteristics of sudden death at Ladoke Akintola University of Technology (LAUTECH Teaching Hospital, South West Nigeria.Methods: This was a retrospective descriptive study of all cases of natural unexpected death, either occurring out of hospital or less than 24 hours after admission to LAUTECH Teaching Hospital, over a nine-year period from January 2003 to December 2011. Data were generated from information in the case notes and autopsy reports for these cases.Results: Sudden death accounted for 29 (4.0% of 718 adult medical deaths and 1.0% of all adult medical admissions. Out-of-hospital deaths occurred in 72.4% of cases. The mean age of the patients was 46.8 ± 11.5 (range 25–74 years. The male to female ratio was 6.25:1. Cardiovascular disease were the most common cause of death (51.7%, followed by respiratory disease (20.7%, pulmonary thromboembolism (10.4%, central nervous system disease (13.8%, gastrointestinal disorders (13.8%, severe chemical/drug poisoning (13.8%, and combined cardiovascular and central nervous system disease (13.8%. Hypertension-related causes were responsible for 14/29 (48.3% of the sudden deaths. Hypertensive heart disease accounted for 86.7% of the cardiovascular deaths, hypertensive heart failure accounted for 73.3%, whilst all heart failure cases accounted for 80.0%. Left ventricular hypertrophy was present in 69.2% of the patients with hypertensive heart disease. Moderate to severe

  16. A new method for tracking poultry litter in the Potomac Basin headwaters of West Virginia.

    Science.gov (United States)

    Weidhaas, J; Lipscomb, E

    2013-08-01

    To validate the distribution of a poultry litter-specific marker gene in faecally contaminated environmental waters of an intensive poultry litter rearing region. A TaqMan(®)-based qPCR assay for Brevibacterium sp. LA35 16S rRNA (LA35 gene), which was previously shown to be associated with poultry litter and faeces, was tested on 126 nontarget faecal samples and 28 poultry litter and faecal samples. The TaqMan assay was sensitive (76%) and specific (100%) to the LA35 gene and exhibited a detection limit for poultry litter in water samples that is sufficiently low (2.5 × 10(-2) mg litter l(-1)) to be applicable for environmental monitoring. The LA35 gene was detected in 43% of water samples (n = 30) collected in an intensive poultry rearing region of West Virginia which drains to the Chesapeake Bay. The poultry-specific TaqMan qPCR method for the LA35 gene is more specific than previously published methods and can be used to identify regions impacted by poultry rearing activities. The LA35 gene appears to have a broad geographical distribution as it has been found in poultry litter and faeces from Delaware and West Virginia, in this study and from Arkansas, Georgia, Florida, Minnesota, Oklahoma and Utah previously. © 2013 The Society for Applied Microbiology.

  17. The Hydrologic Regime of the La Plata Basin in South America

    Science.gov (United States)

    Berbery, E. H.; Barros, V. R.

    2002-12-01

    The main components of the hydrologic cycle of the La Plata basin in southeastern South America are investigated using a combination of observations, satellite products and National Centers for Environmental Prediction-National Center for Atmospheric Research (NCEP-NCAR) global reanalyses. La Plata basin is second only to the Amazon basin in South America, and plays a critical role in the economies of the region. It is a primary factor in energy production, water resources, transportation, agriculture and livestock. Of particular interest was to evaluate the annual cycle of the hydrologic cycle components. The La Plata annual-mean river discharge is about 21,000 m3 s-1, and the amplitude of the mean annual cycle of La Plata River discharge is small: it is slightly larger during late summer, but continues with large volumes even during winter. The reason is that different precipitation regimes over different locations contribute to the total river discharge. One regime is found toward the northern boundary, where precipitation peaks during summer in association with the southernmost extension of the monsoon system. A second one is found over the central part of the basin, where precipitation peaks at different times in the seasonal cycle. Further analysis of the main tributaries of La Plata (Paran , Uruguay and Paraguay) reveals that each has a well defined annual cycle, but with different phases that can be traced primarily to each basin's physiography and precipitation regime. The upper and middle portions of the Paran River are most influenced by the summer monsoon regime, thus the river has a maximum discharge in late summer. The annual cycle of precipitation over the Uruguay River basin has two maxima, one in late autumn and the second one in spring and, consistently, the river discharge is largest in winter and spring. The smooth annual cycle of the Paraguay River discharge, with a maximum in winter, is the result of the Pantanal, a large wetland that

  18. Geochemistry of some deep gold mine waters from the western portion of the Witwatersrand Basin, South Africa

    Science.gov (United States)

    Duane, M. J.; Pigozzi, G.; Harris, C.

    1997-02-01

    A suite of 12 mine water samples within the Witwatersrand Basin (South Africa) were analysed for trace element concentrations, strontium isotopic composition and stable isotopes (O and H). Chemical profiles for four Au mines (Western Deep Levels, Vaal Reefs, Freddies and President Steyn) are used to infer origin, chemical and isotopic evolution of the brines and for comparison with basement brines from other Precambrian areas. Systematic relationships are observed between {87Sr}/{86Sr} and {1}/{Sr} : two major mixing trends are required to explain the range of very radiogenic end-members. Possible end-members for the two components could be (1) {87Sr}/{86Sr} = 0.7251 , Sr concentration = 0.12 mg l -1 from a Vaal Reefs compartment and {87Sr}/{86Sr} = 0.7694 , Sr = 39.3 mg l -1 from a Freddies compartment. (2) {87Sr}/{86Sr} = 0.7251 , Sr = 0.12 mg l -1 (as above) with a {87Sr}/{86Sr} = 0.7404 , Sr = 745 mg l -1 from Western Deep Levels. Strontium isotope ratios range above those expected for present-day seawater and are even higher than some locally-derived low Rb minerals from the Precambrian basement. The brines acquired radiogenic 87Sr through interaction with granitic basement (Kaapvaal Craton), shales of the Central Rand Group (in particular Ventersdorp Contact Reef), siliclastics within the West Rand Group and particularly with dolomites from the overlying Transvaal Supergroup. In order to obtain their multielement and radiogenic isotope signatures the meteoric waters descended through fractured rocks between the main dykes and faults (example: Oberholzer and Bank Dyke at Western Deep Levels). They slowly interacted with Au bearing conglomerates and quartzites of the West Rand Group. The inverse relationship between Sr isotope composition and precious/heavy metal concentration suggests fluid/rock interaction within the shales and volcanics of the Ventersdsorp Contact Reef (high in Au and total organic carbon [TOC], less radiogenic strontium composition by

  19. Regional comparison of syn- and post-rift sequences in salt and salt-free basins offshore Brazil and Angola/Namibia, South Atlantic

    Science.gov (United States)

    Strozyk, Frank; Back, Stefan; Kukla, Peter

    2015-04-01

    The large South Atlantic basins offshore South America and Africa record a highly variable syn- to post-breakup tectono-stratigraphic development. The present-day diversity in the structural and sedimentary architecture of the conjugate margins offshore southern Brazil, Namibia and Angola reflects variations in the interplay of a number of controlling factors, of which the most important are i) the structural configuration of each margin segment at the time of break-up, ii) the post break-up geodynamic history including tectonics and magmatism, and iii) variations in the type, quantity and distribution of sediment input to the respective margin segment. Particularly the basins around the Rio Grande Rise - Walvis Ridge volcanic complex show a pronounced tectono-stratigraphic asymmetry both along the respective continental margin and across the Atlantic. Only a few attempts exist to establish a regional tectono-stratigraphic correlation framework across the South Atlantic Ocean, mainly because of the lack of data across entire margin segments and limited resolution of basin wide geophysics. Still unresolved issues particularly concern the explanation of the basin-specific geological evolution of respective margin segments along the same continental margin, as well as the correlation of conjugate basins and margin segments across the Atlantic Ocean. In our study we present interpretations and first-pass restorations of regional 2D seismic-reflectivity data from the large basins offshore Brazil (Pelotas Basin, Santos Basin, Campos Basin, Espirito Santo Basin), and offshore Namibia and Angola (Walvis Basin, Namibe Basin, Benguela Basin, Kwanza Basin), which represent four adjacent pairs of conjugate basins on both sides of the South Atlantic. Results are used to document and compare on a basin-scale the contrasting styles of rift and post-rift settings during and after the continental breakup.

  20. Flooding in the South Platte River and Fountain Creek Basins in eastern Colorado, September 9–18, 2013

    Science.gov (United States)

    Kimbrough, Robert A.; Holmes, Robert R.

    2015-11-25

    On September 9, 2013, rain began to fall in eastern Colorado as a large low-pressure system pulled plumes of tropical moisture northward from the Pacific Ocean and the Gulf of Mexico. By September 16, 2013, as much as 12 to 20 inches of rain had fallen in the foothills of the Front Range of the Southern Rocky Mountains and adjacent plains near Colorado Springs, Colorado, north to the Colorado-Wyoming border. The rain caused major flooding during September 9–18, 2013, in a large part of the South Platte River Basin and in the Fountain Creek Basin. The floods resulted in several fatalities, more than 31,000 damaged or destroyed structures, and an estimated 3 billion dollars in damages. The U.S. Geological Survey (USGS) documented peak stage, streamflow, or both from the flood event for 80 sites located on selected rivers and streams in the South Platte River and Fountain Creek Basins and on the Platte River in Nebraska. The majority of flood-peak streamflows occurred on September 12 or 13, 2013, coinciding with the period of maximum rainfall. The flood resulted in new record peak streamflows at 17 streamgages having at least 10 years of record; 13 in the South Platte River Basin and 4 in the Fountain Creek Basin.

  1. Change in Heavy Rainfall Characteristics over the Ouémé River Basin, Benin Republic, West Africa

    Directory of Open Access Journals (Sweden)

    Jean Hounkpè

    2016-03-01

    Full Text Available Climate change has severe impacts on natural resources, food production and consequently on food security especially in developing countries. Likely accentuated by climate change, flooding is one of the disasters that affects people and destroies agricultural land and products. At different governance levels and scales, appropriate responses are needed. Cluster analysis using scaled at-site characteristics was used to determine homogeneous rainfall regions. A methodology for detecting change was applied to heavy daily rainfall of 34 stations across the Ouémé basin, Benin, in order to assess potential change in its characteristics. The spatial variability of the detected changes in return periods was analyzed using the kriging interpolation method. For this analysis, up to 92 years (1921–2012 of rainfall data were used. Three homogeneous regions were found by the cluster analysis. For all studied return periods, 82% of the stations showed statistically significant change in daily precipitation, among which 57% exhibited a positive change and 43% negative change. A positive change is associated with an increase in heavy rainfall over the area of concern. An analysis of the interpolated change in heavy rainfall of different return periods revealed an east-west gradient from negative to positive along the lower Ouémé basin (Region 2. From the middle to the upper Ouémé (Region 1 and 3, a decreasing tendency of heavy rainfall is dominant mainly for the non-homogeneous period. This result of the complex pattern of changes could be veritable information for decision makers and consequently for development of appropriate adaptation measures.

  2. Detection and attribution of climate change at regional scale: case study of Karkheh river basin in the west of Iran

    Science.gov (United States)

    Zohrabi, Narges; Goodarzi, Elahe; Massah Bavani, Alireza; Najafi, Husain

    2017-11-01

    This research aims at providing a statistical framework for detection and attribution of climate variability and change at regional scale when at least 30 years of observation data are available. While extensive research has been done on detecting significant observed trends in hydroclimate variables and attribution to anthropogenic greenhouse gas emissions in large continents, less attention has been paid for regional scale analysis. The latter is mainly important for adaptation to climate change in different sectors including but not limited to energy, agriculture, and water resources planning and management, and it is still an open discussion in many countries including the West Asian ones. In the absence of regional climate models, an informative framework is suggested providing useful insights for policymakers. It benefits from general flexibility, not being computationally expensive, and applying several trend tests to analyze temporal variations in temperature and precipitation (gradual and step changes). The framework is implemented for a very important river basin in the west of Iran. In general, some increasing and decreasing trends of the interannual precipitation and temperature have been detected. For precipitation annual time series, a reducing step was seen around 1996 compared with the gradual change in most of the stations, which have not experience a dramatical change. The range of natural forcing is found to be ±76 % for precipitation and ±1.4 °C for temperature considering a two-dimensional diagram of precipitation and temperature anomalies from 1000-year control run of global climate model (GCM). Findings out of applying the proposed framework may provide useful insights into how to approach structural and non-structural climate change adaptation strategies from central governments.

  3. Pliocene Tectonics Suggest an End to Passive Margin Subsidence: A Fresh Look at the Canterbury Basin, South Island, New Zealand

    Science.gov (United States)

    Dvorak, K.; Kominz, M. A.; Crundwell, M.

    2016-12-01

    The Canterbury Basin (South Island, New Zealand) is a passive margin that formed after initial rifting from Antarctica approximately 80 Ma (Lu and Fulthorpe, 2004). The IODP expedition 317 borehole U1352 and the nearby industry Clipper 1 cuttings have been resampled and foraminifera were analyzed to determine depositional environments from the Late Eocene to the Present (Crundwell, 2014). Using this data, a new basin subsidence model was generated for the Canterbury Basin. Backstripping reveals several tectonic `events' between about 17.5 and 11 Ma. However, the timing of these events are not consistent in the two nearby cores. This suggests that these events could be artifacts of contamination due to downslope transport of relatively shallow sediments. In contrast, both cores show an uplift event that began at about 5.5 Ma and brought this part of the South Island shelf to its current elevation by about 3 Ma. These new data suggest that, at least since 5.5 Ma, the Canterbury Basin subsidence history has not been dominated by thermally induced, passive margin subsidence. Crundwell, M.P., 2014, Pliocene to Late Eocene foraminiferal and bolboformid biostratigraphy of IODP Hole 317-U1352C, Canterbury Basin, New Zealand, GNS Science Report 2014/15, 49p. Lu, H. and Fulthorpe, C.S., 2004, Controls on sequence stratigraphy of a middle Miocene-Holocene current-swept, passive margin: Offshore Canterbury Basin, New Zealand, GSA Bulletin, v. 166, 11/12, p. 1345-1366.

  4. Contrasting Permo - Carboniferous Evolution of Resita and Sirinia - Presacina Basins (South Carpathians, Romania); an overview.

    Science.gov (United States)

    Tatu, M.; Seghedi, I.; Nutu, L. M.; Nicolae, I.

    2009-04-01

    Two important Permo-Carboniferous molasses basins Resita and Sirinia - Presacina occur in Romanian Banat (south-western part of Carpathian chain), unconformable overlie the Getic and Danubian domains with different pre-Variscan and Variscan geodynamic history. They show differences in their lithology reflecting various geotectonic settings and evolutions. In the Resita domain the Upper Carboniferous deposits (Westphalian - Stephanian in age, according to the previous paleobotanic and palynological data) are important in volume and they contain terrigeneous siliciclastic rocks represented by sandy - conglomerate and argillaceous - sandy rocks variable in thickness with siltstone, carbonaceous shale and coal beds interlayering. There are not volcanic rocks present in Upper Carboniferous of Resita domain. In contrast with Resita in the Sirinia - Presacina basins the Upper Carboniferous deposits are volumetrically more restrictive. These deposits transgresively overlie pre-Sudetian formations and consist of continental - lacustrine terrigeneous formations, rarely associated with limnic carbonatic rocks. In this association the alternating conglomerate, siliceous sandstone, siltstone and clay with lens - like coal inter-layers prevails. In two small areas Dragosela - Tulinecea - Camenita (in the western part) and Baia Noua - Cucuiova (in the eastern part) the terrigeneous deposits are associated with basaltic andesite and andesite rocks with alkaline affinity. In both of these basins the Lower Permian deposits (according to the paleobotanic data) unconformably overlie the Upper Carboniferous formations and/or pre-Sudetian basements. The Lower Permian deposits in the Resita basin occur in two superposed formations (Nastaseanu, 1987): (1) Walchia Beds dominated by black argillaceous shales, slightly bituminous with rare sandy-conglomerate interlayers and (2) Red Beds composed by sandy-conglomerate deposits with some argillaceous intercalations, all red in color, with

  5. Trichinella britovi in the jackal Canis aureus from south-west Iran.

    Science.gov (United States)

    Mirjalali, H; Rezaei, S; Pozio, E; Naddaf, S R; Salahi-Moghaddam, A; Kia, E B; Shahbazi, F; Mowlavi, Gh

    2014-12-01

    Trichinellosis is an important helminthic food-borne zoonosis, which is caused by nematodes of the genus Trichinella. Although, Trichinella spp. has been detected frequently in Iranian wildlife, this parasitic infection is not considered a major public health problem. This is largely because Islamic codes forbid consumption of pork meat in this country. However, knowledge about this zoonotic pathogen is important because human trichinellosis has been documented in countries where most of the population is Muslim. The aims of the present work were to investigate whether Trichinella spp. was still circulating in wildlife of the Khuzestan Province (south-west Iran) about 30 years after the first investigation, to identify the aetiological agent at the species level by molecular analyses, and to review the literature on Trichinella spp. in animals of Iran. During the winter 2009-2010, muscle samples from 32 road-killed animals (14 dogs and 18 jackals, Canis aureus) were collected. Muscle samples were digested and Trichinella sp. larvae were isolated from two jackals. The Trichinella sp. larvae have been identified as Trichinella britovi by molecular analyses. These results confirm that T. britovi is the prevalent species circulating in wild animals of Iran.

  6. Terrace Agriculture of the Hani People – Cultural Heritage of the South-West China

    Directory of Open Access Journals (Sweden)

    Kladovshchikova Mariya Evgenyevna

    2015-04-01

    Full Text Available The article presents the features of terrace agriculture of Hani and Yi indigenous minorities, living in the Yunnan province in the South-West China, just a step away from the Laos and Vietnam boundaries. The cultural landscape of the Hani rice terraces, included into the UNESCO World Heritage List in 2013 (Cultural Landscape of Honghe Hani Rice Terraces, expresses the conservation of the minorities’ course of life during the last 1 300 years. The geological framework, climate patterns and conform type of vegetation predefine the specific character of natural conditions necessary for terrace agriculture and red rice growth – the most important crop within the region. At that, the landscape picture which fully reflects the season fluctuations of regional subtropical climate, also facilitates to aesthetic and romantic perception forming, symbolizing man-made environment integral and interlaced into natural landscape. The special focus is made on the description of terraced slopes unique morphology and ancient land cultivation technologies for the essential regional culture – red rice. Preservation of centuries-old traditions of efficient agriculture makes it possible to achieve integration of cultural and natural landscapes, that seamlessly comprises the ethnic minorities’ life, as well as to prevent development of erosion and landslide slope processes. The elements of the traditional Hani people way of life, including ritual customs associated with terrace agriculture, are particularly described.

  7. Variability in thyroid function test requests across general practices in south-west England.

    Science.gov (United States)

    Vaidya, Bijay; Ukoumunne, Obioha C; Shuttleworth, Joanna; Bromley, Alan; Lewis, Aled; Hyde, Chris; Patterson, Anthea; Fleming, Simon; Tomlinson, Julie

    2013-01-01

    The number of thyroid function tests (TFTs) performed in the UK and other countries has increased considerably in recent years. Inconsistent clinical practice associated with inappropriate requests for tests is thought to be an important cause for this increase. To study the extent of variability in requests for TFTs from general practices. We analysed routine data on all TFTs on patients aged 16 years and over carried out by two hospitals in south-west England (Royal Cornwall Hospital and Royal Devon & Exeter Hospital) during 2010 at the request of 107 general practices. A total of 195 309 TFT requests were made for 148 412 patients (63% female). The total requests included 192 108 tests for thyroid-stimulating hormone (TSH), 43 069 for free thyroxine (FT4) and 1972 for free tri-iodothyronine (FT3). The number of TSH tests per 1000 list size varied widely across the practices, ranging from 84 to 482. Most of the variation was due to heterogeneity across practices and only 24% of this was accounted for by prevalence of hypothyroidism and socio-economic deprivation. There is wide variation in TFT requests from general practice and scope to reduce both unnecessary TFTs and the variability in the clinical practice. Further studies are required to understand the causes for the variability in testing thyroid function.

  8. Compliance and side effects of prophylactic oseltamivir treatment in a school in South West England.

    Science.gov (United States)

    Wallensten, A; Oliver, I; Lewis, D; Harrison, S

    2009-07-30

    School closure along with mass prophylactic oseltamivir treatment of pupils have been used in England and elsewhere to contain school outbreaks of influenza A(H1N1)v. We evaluated the protective effect, compliance with and side effects of oseltamivir chemoprophylactic treatment with a ten-day course of 1x 75mg given to 11-12-year-old pupils in one school year in a secondary school in South West England closed for ten days in response to a symptomatic laboratory-confirmed pupil. We distributed a questionnaire to pupils in the affected school year in class after the school had re-opened. Questions included symptoms of flu-like illness, compliance with chemoprophylaxis and side effects. All present on the day, 248 (93.2%) participated. Compliance with chemoprophylaxis was high, 77% took the full course, 91% took at least seven days. Fifty-one percent experienced symptoms such as feeling sick (31.2%), headaches (24.3%) and stomach ache (21.1%). Although some children were ill with flu-like symptoms, those tested did not have A(H1N1)v infection. Compliance with oseltamivir chemoprophylaxis was high, although likely side effects were common. The burden of side effects needs to be considered when deciding on mass oseltamivir chemoprophylaxis in children especially given that the symptoms of A(H1N1)v influenza are generally mild.

  9. Reproductive biology of the spotback skate Atlantoraja castelnaui in the south-west Atlantic Ocean.

    Science.gov (United States)

    Colonello, J C; García, M L; Lasta, C A; Menni, R C

    2012-06-01

    This study provides information on the reproduction of spotback skate Atlantoraja castelnaui. A total of 232 individuals (119 females and 113 males) were obtained from surveys carried out between 2003 and 2006, from the south-west Atlantic Ocean, between 34 and 42° S and <50 m deep; another 514 specimens (241 females and 273 males) were obtained between 2005 and 2007 from commercial fishery operations carried out in the same area and landings in the port of Mar del Plata, Argentina. Males ranged from 185 to 1250 mm total length (L(T) ) and females from 243 to 1368 mm L(T) . Length at maturity was estimated to be 980 mm for males and 1089 mm L(T) for females. Lack of variation of testis mass together with the continuous production of mature spermatocyst and spermatozoa in deferent ducts suggested that males can reproduce throughout the year. Females reproduced year-round with peaks of reproductive activity an integral part of a continuous cycle. This conclusion is corroborated by the seasonal variation of ovaries, oviducal gland and the occurrence of females with eggs in the uterus throughout the year. Results from this study indicate that A. castelnaui is very susceptible to fishery pressure. © 2012 The Authors. Journal of Fish Biology © 2012 The Fisheries Society of the British Isles.

  10. Land use influences on acidification and recovery of freshwaters in Galloway, south-west Scotland

    Directory of Open Access Journals (Sweden)

    R. C. Helliwell

    2001-01-01

    Full Text Available The long term response of surface waters to changes in sulphur deposition and afforestation is investigated for three upland river systems in the Galloway region of south-west Scotland. From 1984-1999, these rivers exhibited a statistically significant decline in non-marine sulphate concentrations in response to reduced acid deposition. This reduction in non-marine sulphate was, however, insufficient to induce a pH recovery over the period. A statistically significant increase in river pH was observed between 1956-1970 (0.05 yr-1 when subsidised agricultural lime payments were at a maximum. In 1976, this subsidy ceased and surface waters have progressively acidified. In addition, climatic change is found to influence long-term trends in pH. Mean annual pH was greatest during a dry period between 1969-1973 when total annual discharge was low. Thereafter, pH declined gradually in response to higher rainfall and increased total annual discharge. Overall, surface waters draining the afforested catchments of the Rivers Cree and Bladnoch are more acid than those draining the moorland catchment of the Luce. These results indicate that in afforested catchments, current reductions in sulphur emissions have not led to an observed improvement in the acid status of surface waters. Forestry, therefore, represents a confounding factor with regard to chemical recovery from acidification in this region. Keywords: acidification, afforestation, deposition, rivers, lochs, non-marine sulphate, pH

  11. Trends in the diagnosis and management of hypertension: repeated primary care survey in South West England.

    Science.gov (United States)

    Mejzner, Natasha; Clark, Christopher E; Smith, Lindsay Fp; Campbell, John L

    2017-05-01

    Previous surveys identified a shift to nurse-led care in hypertension in 2010. In 2011 the National Institute for Health and Care Excellence (NICE) recommended ambulatory (ABPM) or home (HBPM) blood pressure (BP) monitoring for diagnosis of hypertension. To survey the organisation of hypertension care in 2016 to identify changes, and to assess uptake of NICE diagnostic guidelines. Questionnaires were distributed to all 305 general practices in South West England. Responses were compared with previous rounds (2007 and 2010). Data from the 2015 Quality and Outcomes Framework (QOF) were used to compare responders with non-responders, and to explore associations of care organisation with QOF achievement. One-hundred-and-seventeen practices (38%) responded. Responders had larger list sizes and greater achievement of the QOF target BP ≤150/90 mmHg. Healthcare assistants (HCAs) now monitor BP in 70% of practices, compared with 37% in 2010 and 19% in 2007 ( P primary care BP monitoring has devolved from GPs and nurses to HCAs. One in 10 practices are not implementing NICE guidelines on ABPM and HBPM for diagnosis of hypertension. Most practices express confidence interpreting HBPM results but less so with ABPM. The need for education and quality assurance for allied health professionals is highlighted, and for training in ABPM interpretation for GPs. © British Journal of General Practice 2017.

  12. Profiles of innovators in a semi-arid smallholder agricultural environment in south west Zimbabwe

    Science.gov (United States)

    Mutsvangwa-Sammie, Eness P.; Manzungu, Emmanuel; Siziba, Shephard

    2017-08-01

    Innovations are regarded as critical to improving the efficiency, productivity and effectiveness of African agriculture. However, few efforts have been directed at understanding 'agricultural innovators', especially among smallholder farmers in sub-Saharan Africa who face low agricultural productivity and widespread food insecurity. This paper investigates the profile of innovators from a local perspective in a semi-arid smallholder farming area in south-west Zimbabwe. The paper is based on data collected from key informant interviews and a household questionnaire survey administered to 239 households from Gwanda and Insiza districts between 2013 and 2014. Qualities or attributes of an innovator (which constitute the profile of an innovator) identified by key informants included: resource endowment; social networks; education; and enthusiasm (passionate and hardworking). The attributes were used in a logit regression model to estimate the probability of the 239 households exhibiting the attributes of an innovator. Social networks and resource endowment, as depicted by amount of land cultivated, were found to significantly influence the probability of an individual being an innovator. Interestingly, the common attributes of education or belonging to an innovation platform used by extension and development agents, were found not to influence the probability of one being an innovator. The paper concludes that understanding local perceptions of innovators, which is based on appreciation of the socio-economic and biophysical circumstances, should be used to identify a 'basket' of context specific innovations that have potential to address the diverse needs of rural households farming households.

  13. Health status of bulls used for natural breeding on farms in south west Scotland.

    Science.gov (United States)

    McGowan, A C; Murray, R D

    1999-06-01

    One hundred and nine breeding bulls were examined during the period November 1992 to June 1993 on farms in south west Scotland for evidence of infectious diseases associated with breeding. Preputial washings were collected to screen for Campylobacter fetus venerialis, together with serial blood samples to assess their seroprevalence to Bovine Virus Diarrhoea virus (BVDv), Bovine Herpes Virus-1 (BHV-1), Leptospira hardjo and Bovine Herpes Virus-4 (BHV-4). The possible impact of natural mating on the epidemiology of these diseases is described. Evidence of infections with Campylobacter fetus and BVH-4 were not found in this sample. The overall seroprevalence to BVDv was 78%, for BHV-1 49%, and L. hardjo 27% at titres of > or = 1/400. This study shows that bulls may be responsible for the introduction and dissemination of these diseases when moved from farm to farm as part of normal cattle breeding in this area. Young unproven bulls may be particularly susceptible to endemic diseases associated with lowered reproductive performance.

  14. Contextual socioeconomic determinants of cardiovascular risk factors in rural south-west China: a multilevel analysis

    Directory of Open Access Journals (Sweden)

    Geater Alan

    2007-05-01

    Full Text Available Abstract Background We examined independent influences of contextual variables on cardiovascular risk factors in Shilin county, Yunnan province, South-west China. Methods Three villages were selected from each of the ten townships based on probability proportional to size. In each selected village, 200 individuals aged ≥ 45 years were chosen based on simple random sampling method. From 6006 individuals, information on demographic characteristics, smoking and drinking status was obtained by interview. Blood pressure, height, weight, and waist and hip girth were measured. Fasting blood sugar was measured in a 10-percent subsample. Contextual data were from official reports. Multi-level regression modelling with adjustment for individual and contextual variables was used. Results Contextual variables associated with CVD risk factors included: remoteness of village with higher blood pressure and fasting blood sugar, high proportion of Yi minority with drinking, high literacy rate with a lower rate of smoking and a lower mean waist-hip ratio, and high average income with lower systolic blood pressure and body mass index (BMI but higher FBS. Conclusion While contextual SES is associated with a few CVD risk factors, villages with high level of income are worse off in fasting blood sugar. Strategies of economic development should be reviewed to avoid adverse effects on health.

  15. Environment and Health - Bridging South, North, East and West. Basel, Switzerland 19-23 August 2013.

    Science.gov (United States)

    2013-08-19

    EHP is pleased to present the abstracts from the 2013 conference Environment and Health-Bridging South, North, East and West, held 19-23 August 2013 in Basel, Switzerland, and hosted by the Swiss Tropical and Public Health Institute. The conference was a joint meeting of the International Society for Environmental Epidemiology (ISEE), the International Society of Exposure Science (ISES), and the International Society of Indoor Air Quality and Climate (ISIAQ). More than 1,700 participants from all continents and over 70 countries attended. The abstracts are searchable by abstract number, author name, and any word that appears anywhere in the abstract. Use the Filtered Search option to narrow search results by author-assigned keyword. Suggested citation: Abstracts of the 2013 Conference of the International Society of Environmental Epidemiology (ISEE), the International Society of Exposure Science (ISES), and the International Society of Indoor Air Quality and Climate (ISIAQ), August 19-23, 2013, Basel, Switzerland. 2013. Environ Health Perspect. Read how the organizers reduced the environmental footprint of the conference in "The Vision of a Green(er) Scientific Conference," an editorial in the August issue of EHP by Nino Künzli and Martin Röösli, conference chairs, and Martina S. Ragettli, chair of the local organizing committee "green club." For more information on the conference, be sure to check out the press release and photos from the Swiss Tropical and Public Health Institute.

  16. DYNAMICS OF MAIN INDICATORS FOR ECONOMIC GROWTH IN SOUTH-WEST OLTENIA REGION

    Directory of Open Access Journals (Sweden)

    Mariana Claudia Mungiu- Pupăzan

    2012-03-01

    Full Text Available All resources available to a certain point in time (both physical and economic sense and financial sense are highlighted by the nation's wealth, in the very limited sense, is a stock. Given that the stock of physical resources (infrastructure, natural resources, capital invested in enterprises, technical knowledge and training of the population is very difficult to measure, are always references but not a stock at a flow: the flow of goods and services produced in a given year by a country, just what we call gross domestic product GDP (gross domestic product. Economic growth and thus real convergence, both at national and regional level are assessed based on the development processes of gross domestic product.Socio-economic development of South-West Oltenia Region and parts of five counties must take into account national development priorities established by the National Development Plan and the strategic guidelines and EU Integrated Guidelines for Growth and jobs. In an attempt to define the basic problems is very important to take into account and consider the existence of situations of discrimination and promoting equal opportunities for men and women, young and old, the majority and ethnic minorities, while paying attention needs of disabled persons for their economic and social integration.

  17. Hydrothermal extremes at the South-West Pribaikalie during the current climate changes

    Science.gov (United States)

    Voropay, Nadezhda

    2017-04-01

    Climatic extremes of air temperature and precipitation were analyzed for the Tunka Intermountain Depression (South-West Pribaikalie, Buryatia, Russian Federation). Intermountain depressions occupy a quarter of the territory of the Baikal region. The specific climatic conditions in the depressions are formed due to the geographic location and the influence of latitudinal zonation and altitudinal gradients. Air temperature and precipitation data records from at weather stations for the period 1940-2015 were analyzed. Long-term average annual temperature is negative and varies from -0.8 °C to -2.4 °C. Air temperature absolute minimum is -48 °C, absolute maximum is +36 °C. The long-term average annual precipitation is 370-480 mm, but in some years annual precipitation reach 760 mm. The summer months have about 70% of the total annual precipitation, in July and August the sum may reach 340 mm. Maximum daily sum of rainfalls is 80 mm. The contribution of the global and regional circulation characteristics into the variability of regional climatic characteristics was estimated.

  18. Small is beautiful: Marine small-scale fisheries catches from the South-West Maluku Regency

    Science.gov (United States)

    Hutubessy, BG; Mosse, JW; Hayward, P.

    2017-10-01

    The fisheries data supplied by fisheries agency have served as the primary tool for regional fisheries statistics. However, it is recognized these data are incomplete and often underestimate actual catches, particularly for small-scale fisheries. There is no widely accepted definition of small-scale fisheries or global data on number of small-scale fishers and their catches. This study reconstructed total marine catches from 1980 to 2015 for South-west Maluku (MBD) regency, by applying an established catch construction approach utilizing all available quantitative and qualitative data, combined with assumption-based estimations and interpolations. As newly established regency since 2009, there is lack of fisheries data available which is needed for fisheries management. Fishers’ knowledge is important information taken from to construct long-term fisheries data. Estimated total fish withdrawal from MBD waters was 86,849.66 tonnes during 1980 – 2015, dominated by pelagic fishes. Consistency of estimated total removal and total landings at MBD regency play important role in small-scale fisheries management and this method of visualizing the history of fishery from poor-data condition might be an optimistic effort.

  19. Epidemiology of elderly patients' burns in the South West of France.

    Science.gov (United States)

    Cutillas, M; Sesay, M; Perro, G; Bourdarias, B; Castede, J C; Sanchez, R

    1998-03-01

    A retrospective study of 716 patients aged 60 years and above (324 men, 392 women) was undertaken in order to determine quality control in burns management in the South West of France. The following epidemiological data was obtained: high hospitalization rate (7 per cent of the general admissions); monthly and seasonal periodicity; predominance of indoor accidents (86 per cent) with domestic accidents being more frequent in women (63 vs. 37 per cent). Outdoor accidents were mainly recreational and were five times more frequent in men than in women. The overall mortality was 39 per cent and was influenced by the burns extent, depth, predisposing factors and early management. More burns occurred in urban areas (53 per cent) but mortality was higher in patients from rural areas (62 vs. 38 per cent). It was observed that delay in management, especially fluid resuscitation of patients from the rural areas, was partly responsible for this outcome. Propositions were made to diffuse more information on the importance of early management of burns in rural areas.

  20. Anthelmintic resistance in cattle nematodes on 13 south-west Victorian properties.

    Science.gov (United States)

    Rendell, D K

    2010-12-01

    To report the level of anthelmintic resistance on 13 commercial cattle properties in south-west Victoria, Australia. Between 2006 and 2009 worm egg count reduction tests were conducted on calves on the 13 properties. Samples were collected 10-14 days post anthelmintic treatment and worm egg counts and larval differentiation tests were conducted. Resistance was defined if there was less than 95% reduction (lower confidence limit Cooperia spp. to IVM (6/11). No resistance to LEV was detected in Trichostrongylus or Cooperia spp. Suspected IVM-resistant Trichostrongylus spp. and BZ-resistant Cooperia spp. were only detected on one property each. This is the first Australian report of macrocyclic lactone-resistant O. ostertagi in the refereed literature. The frequency of resistance in O. ostertagi to BZ, LEV and IVM and in Trichostrongylus spp. to BZ in the present study appears higher than levels detected in the 2004-05 New Zealand survey, whereas the resistance frequency in Cooperia spp. to IVM and BZ was less. © 2010 The Author. Australian Veterinary Journal © 2010 Australian Veterinary Association.

  1. The validity of DSM-IV dissociative disorders categories in south-west Uganda.

    Science.gov (United States)

    Van Duijl, Marjolein; Cardeña, Etzel; De Jong, Joop T V M

    2005-06-01

    There is little systematic research on the cross-cultural validity of the dissociative disorders, especially in non-western countries. This study evaluates the fit of the DSM-IV classification and concepts of these disorders with local concepts, experiences and local presentations in south-west Uganda. We conducted focus group discussions with medical students, traditional healers, religious leaders, counselors, community members and other health workers (n=48). They were supplemented by key informant interviews with religious people, traditional healers and leaders (n=11). The responses were subjected to thematic analysis. Dissociative amnesia and depersonalization were generally recognized and seen as the result of traumatic experiences and were useful categories in Uganda. However, dissociative fugue did not match local concepts and was confused with spirit possession and other conditions such as alcoholic fugues and dementia. The description of dissociative identity disorder was always interpreted as a possession trance disorder by the local healers. We found only partial support for the validity of the DSM-IV classification of dissociative disorders in Uganda.

  2. Identification of Novel Cetacean Poxviruses in Cetaceans Stranded in South West England.

    Directory of Open Access Journals (Sweden)

    James Barnett

    Full Text Available Poxvirus infections in marine mammals have been mainly reported through their clinical lesions and electron microscopy (EM. Poxvirus particles in association with such lesions have been demonstrated by EM and were previously classified as two new viruses, cetacean poxvirus 1 (CePV-1 and cetacean poxvirus 2 (CePV-2. In this study, epidermal pox lesions in cetaceans stranded in South West England (Cornwall between 2008 and 2012 were investigated by electron microscopy and molecular analysis. PCR and sequencing of a highly conserved region within the viral DNA polymerase gene ruled out both parapox- and orthopoxviruses. Moreover, phylogenetic analysis of the PCR product clustered the sequences with those previously described as cetacean poxviruses. However, taking the close genetic distance of this gene fragment across the family of poxviridae into account, it is reasonable to postulate further, novel cetacean poxvirus species. The nucleotide similarity within each cluster (tentative species detected ranged from 98.6% to 100%, whilst the similarity between the clusters was no more than 95%. The detection of several species of poxvirus in different cetacean species confirms the likelihood of a heterogeneous cetacean poxvirus genus, comparable to the heterogeneity observed in other poxvirus genera.

  3. Prevalence of Malaria in Pregnant Women in Lagos, South-West Nigeria

    Science.gov (United States)

    Agomo, Chimere O.; Anorlu, Rose I.; Agomo, Philip U.

    2009-01-01

    Prevalence rates reported for malaria in pregnancy in Nigeria vary considerably. The accuracy of results of malaria diagnosis is dependent on training, experience, and motivation of the microscopist as well as the laboratory facility available. Results of training programmes on malaria microscopy have shown low levels of sensitivity and specificity of those involved in malaria diagnosis routinely and for research. This study was done to ascertain the true prevalence of malaria in pregnancy in Lagos, South-West Nigeria. A total of 1,084 pregnant women were recruited into this study. Blood smears stained with Giemsa were used for malaria diagnosis by light microscopy. Malaria infection during pregnancy presents mostly as asymptomatic infection. The prevalence of malaria in this population was 7.7% (95% confidence interval; 6.2-9.4%). Factors identified to increase the risk of malaria infection include young maternal age (< 20 years), and gravidity (primigravida). In conclusion, this study exposes the over-diagnosis of malaria in pregnancy and the need for training and retraining of laboratory staffs as well as establishing the malaria diagnosis quality assurance programme to ensure the accuracy of malaria microscopy results at all levels. PMID:19488427

  4. Association between ovine protein polymorphisms and geographical variables in Europe and south-west Asia.

    Science.gov (United States)

    Ordas, J G; Carriedo, J A

    1997-01-12

    The spatial distribution of six blood-protein polymorphisms in European and south-west Asian ovine breeds was analysed. Latitudinal clines were found for haemoglobin and transferrin loci. The respective F(ST) values are not significantly greater than those for protein-X, esterase, carbonic anhydrase, and albumin, where gene frequencies are not associated with latitude. The results suggest that historical processes of gene flow, rather than adaptation to different environments, have played a major role in determining the observed lives of gene frequencies. RESUMEN: Asociación entre polimorfismos proteicos ovinos y variables geográficas en Europa y sudoeste de Asia Se ha analizado la distribución espacial de seis polimorfismos proteicos sanguíneos en razas ovinas de Europa y del sudoeste de Asia. La hemoglobina y la transferrina muestran clinas latitudinales. Los valores de F(ST) para estos dos loci no son significativamente más grandes que los de la proteína-X, esterasa, anhidrasa carbónica y albúmina, cuyas frecuencias génicas no están asociadas con la latitud. Los resultados sugieren que la distribución de las frecuencias génicas de la hemoglobina y la transferrina se debe a procesos históricos de flujo génico y deriva genética. 1997 Blackwell Verlag GmbH.

  5. The utilization of aquatic bushmeat from small cetaceans and manatees in South America and West Africa

    Directory of Open Access Journals (Sweden)

    Mel Cosentino

    2016-09-01

    Full Text Available Aquatic bushmeat can be defined as the products derived from wild aquatic megafauna (e.g. marine mammals that are used for human consumption and non-food purposes, including traditional medicine. It is obtained through illegal or unregulated hunts as well as from stranded (dead or alive and bycaught animals. In most South American and West African countries aquatic mammals are or have been taken for bushmeat, including 33 small cetaceans and all three manatee species. Of these, two cetacean species are listed in the IUCN red list as near threatened, and one as vulnerable, as are all manatee species. Additionally, 22 cetacean species are listed as data deficient, hence some of these species may also be at risk. No reports (recent or otherwise were found for some countries, however caution is needed in concluding that aquatic bushmeat is not utilized in these nations. Moreover, although aquatic bushmeat is mostly obtained opportunistically and was likely originally taken only for local consumption, directed catches occur in most countries and may have reached unsustainable levels in some areas. For example, in Peru and Nigeria, thousands of small cetaceans are illegally hunted annually. Reliable, recent data and a better overall understanding of the drivers of aquatic bushmeat will be essential in the development of effective mitigation measures.

  6. Macro and trace elements in Paracentrotus lividus gonads from South West Atlantic areas.

    Science.gov (United States)

    Camacho, Carolina; Rocha, A Cristina; Barbosa, Vera L; Anacleto, Patrícia; Carvalho, M Luísa; Rasmussen, Rie R; Sloth, Jens J; Almeida, C Marisa; Marques, António; Nunes, M Leonor

    2018-04-01

    Sea urchin represents one of the most valuable seafood product being harvested and explored for their edible part, the gonads or roe. This species is generally considered a sentinel organism for ecotoxicological studies being widely used in monitoring programs to assess coastal aquatic environments quality, because is directly exposed to anthropogenic contaminants in their habitat. In this context, the aim of this study is to evaluate the concentrations of macro (Cl, K, P, Ca, S) and trace (Zn, Br, Fe, Sr, I, Se, Rb, Cu, Cr, Ni, As, iAs, Cd, Pb, Hg) elements in Paracentrotus lividus gonads from three South West Atlantic production areas subjected to distinct environmental and anthropogenic pressures. In all studied areas, the elements profile in sea urchin gonads was Cl > K > P > Ca > S > Zn > Br > Fe > Sr > I > Rb > Cu > Se > Cr > Ni, suggesting an element guide profile with special interest for sea urchin farming development. Concerning toxic elements, the profile was the following: As > Cd > Pb > Hg > iAs. The results evidenced higher levels of Pb and Hg in open areas. Distinct area characteristics and anthropogenic pressures of production areas evidence the importance of biomonitoring contaminants, particularly toxic elements. In general, the levels of these elements were below maximum levels in foodstuffs (MLs) which pose a minimal health risk to consumers. Copyright © 2018 Elsevier Inc. All rights reserved.

  7. Reptile-associated salmonellosis in children aged under 5 years in South West England.

    Science.gov (United States)

    Murphy, Dan; Oshin, Femi

    2015-04-01

    To determine the proportion of Salmonella cases in children aged reptile-associated salmonellosis (RAS) and to compare the severity of illness. To analyse all cases of salmonellosis reported to public health authorities in children aged under 5 years in the South West of the UK from January 2010 to December 2013 for reptile exposure, age, serotype, hospitalisation and invasive disease. 48 of 175 (27%) Salmonella cases had exposure to reptiles. The median age of RAS cases was significantly lower than non-RAS cases (0.5 vs 1.0 year). RAS cases were 2.5 times more likely to be hospitalised (23/48) compared with non-RAS cases (25/127; p=0.0002). This trend continued in cases aged under 12 months, with significantly more RAS cases hospitalised (19/38) than non-RAS cases (8/42; p=0.003). Significantly more RAS cases had invasive disease (8/48: 5 bacteraemia, 2 meningitis, 1 colitis) than non-RAS cases (4/127: 3 bacteraemia, 1 meningitis). Reptile exposure was found in over a quarter of all reported Salmonella cases in children under 5 years of age. RAS is associated with young age, hospitalisation and invasive disease. Published by the BMJ Publishing Group Limited. For permission to use (where not already granted under a licence) please go to http://group.bmj.com/group/rights-licensing/permissions.

  8. Liquefaction analysis of alluvial soil deposits in Bedsa south west of Cairo

    Directory of Open Access Journals (Sweden)

    Kamal Mohamed Hafez Ismail Ibrahim

    2014-09-01

    Full Text Available Bedsa is one of the districts in Dahshour that lays south west of Cairo and suffered from liquefaction during October 1992 earthquake, Egypt. The soil profile consists of alluvial river Nile deposits mainly sandy mud with low plasticity; the ground water is shallow. The earthquake hypocenter was 18 km far away with local magnitude 5.8; the fault length was 13.8 km, as recorded by the Egyptian national seismological network (ENSN at Helwan. The analysis used the empirical method introduced by the national center for earthquake engineering research (NCEER based on field standard penetration of soil. It is found that the studied area can liquefy since there are saturated loose sandy silt layers at depth ranges from 7 to 14 m. The settlement is about 26 cm. The probability of liquefaction ranges between 40% and 100%. The presence of impermeable surface from medium cohesive silty clay acts as a plug resisting and trapping the upward flow of water during liquefaction, so fountain and spouts at weak points occurs. It is wise to use point bearing piles with foundation level deeper than 14 m beyond the liquefiable depth away from ground slopes, otherwise liquefaction improving techniques have to be applied in the area.

  9. High spatiotemporal resolution monitoring of hydrological function across degraded peatlands in the south west UK.

    Science.gov (United States)

    Ashe, Josie; Luscombe, David; Grand-Clement, Emilie; Gatis, Naomi; Anderson, Karen; Brazier, Richard

    2014-05-01

    The Exmoor/Dartmoor Mires Project is a peatland restoration programme focused on the geoclimatically marginal blanket bogs of South West England. In order to better understand the hydrological functioning of degraded/restored peatlands and support land management decisions across these uplands, this study is providing robust spatially distributed, hydrological monitoring at a high temporal resolution and in near real time. This paper presents the conceptual framework and experimental design for three hydrological monitoring arrays situated in headwater catchments dominated by eroding and drained blanket peatland. Over 250 individual measurements are collected at a high temporal resolution (15 minute time-step) via sensors integrated within a remote telemetry system. These are sent directly to a dedicated server over VHF and GPRS mobile networks. Sensors arrays are distributed at varying spatial scales throughout the studied catchments and record multiple parameters including: water table depth, channel flow, temperature, conductivity and pH measurements. A full suite of meteorological sensors and ten spatially distributed automatic flow based water samplers are also connected to the telemetry system and controlled remotely. This paper will highlight the challenges and solutions to obtaining these data in exceptionally remote and harsh field conditions over long (multi annual) temporal scales.

  10. West Nile Virus Lineage 2 in Horses and Other Animals with Neurologic Disease, South Africa, 2008-2015.

    Science.gov (United States)

    Venter, Marietjie; Pretorius, Marthi; Fuller, James A; Botha, Elizabeth; Rakgotho, Mpho; Stivaktas, Voula; Weyer, Camilla; Romito, Marco; Williams, June

    2017-12-01

    During 2008-2015 in South Africa, we conducted West Nile virus surveillance in 1,407 animals with neurologic disease and identified mostly lineage 2 cases in horses (7.4%, 79/1,069), livestock (1.5%, 2/132), and wildlife (0.5%, 1/206); 35% were fatal. Geographic correlation of horse cases with seropositive veterinarians suggests disease in horses can predict risk in humans.

  11. New data on the structure of the Vitoria-Trindade seamount chain (western Brazil basin, South Atlantic)

    Science.gov (United States)

    Skolotnev, S. G.; Peyve, A. A.; Turko, N. N.

    2010-04-01

    In 2008, during cruise 24 of the R/V Akademik Vavilov, much of our research work was focused on the central segment (Jaseur and Davis seamounts, Dogaressa Bank) of the Vitoria-Trindade seamount chain (west of the Brazil basin) extending along 20.5° S. Work was conducted to survey the upper part of the sedimentary cover and to perform subbottom profiling. The samples dredged on the seamount slopes are represented by volcanites and Fe-Mn crusts.

  12. NOAA TIFF Image - 3 m Backscatter Mosaic of the south west shore (La Parguera) of Puerto Rico, Project NF-06-03, 2006, UTM 19 WGS84

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — This image represents a 3 meter resolution backscatter mosaic of the south west shore (La Parguera) of Puerto Rico. NOAA's NOS/NCCOS/CCMA Biogeography Team, in...

  13. Natural Communities and Rare Vascular Plants of West Mountain Wildlife Management Area and Nulhegan Basin Division of the Silvio O. Conte National Wildlife Refuge; Mapping, Description, and Ecological Management Recommendations

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — In order to apply a landscape-scale approach to management of the lands, natural communities of the West Mountain Wildlife Management Area and Nulhegan Basin...

  14. Virtual Vents: A Microbathymetrical Survey of the Niua South Hydrothermal Field, NE Lau Basin, Tonga

    Science.gov (United States)

    Kwasnitschka, T.; Köser, K.; Duda, A.; Jamieson, J. W.; Boschen, R.; Gartman, A.; Hannington, M. D.; Funganitao, C.

    2016-12-01

    At a diameter of 200 m, the 1100 m deep Niua South hydrothermal field (NE Lau Basin) was studied in an interdisciplinary approach during the SOI funded Virtual Vents cruise in March of 2016. On the grounds of a previously generated 50 cm resolution AUV multi beam map, the projects backbone is formed by a fully color textured, 5 cm resolution photogrammetrical 3D model. Several hundred smaller and about 15 chimneys larger than 3 m were surveyed including their basal mounds and surrounding environment interconnecting to each other. This model was populated through exhaustive geological, biological and fluid sampling as well as continuous Eh measurements, forming the basis for highly detailed geological structural and biological studies resulting in 3D maps of the entire field. At a reasonable effort, such surveys form the basis for repetitive time series analysis and have the potential of a new standard in seafloor monitoring.

  15. U-Pb zircon ages from the southwestern Karoo Basin, South Africa - Implications for the Permian-Triassic boundary

    Science.gov (United States)

    Fildani, A.; Weislogel, A.; Drinkwater, N.J.; McHargue, T.; Tankard, A.; Wooden, J.; Hodgson, D.; Flint, S.

    2009-01-01

    U-Pb ages determined using sensitive high-resolution ion microprobe-reverse geometry on 205 single-grain zircons from 16 ash beds within submarine fan deposits of the Ecca Group provide the first evidence of a marine Permian-Triassic (P-T) boundary in the Karoo Basin of South Africa. These U-Pb ages provide an objective basis for correlating the deep-marine sediments of the southwest Karoo Basin with fluvial-deltaic deposits in the central and eastern parts of the basin where the P-T boundary is recorded in a diverse macrofauna. Furthermore, these new zircon ages and their correlation imply asymmetric subsidence and variable sedimentation rates across the basin. ?? 2009 Geological Society of America.

  16. Deflating the shale gas potential of South Africa's Main Karoo basin

    Directory of Open Access Journals (Sweden)

    Michiel O. de Kock

    2017-09-01

    Full Text Available The Main Karoo basin has been identified as a potential source of shale gas (i.e. natural gas that can be extracted via the process of hydraulic stimulation or ‘fracking’. Current resource estimates of 0.4–11x109 m3 (13–390 Tcf are speculatively based on carbonaceous shale thickness, area, depth, thermal maturity and, most of all, the total organic carbon content of specifically the Ecca Group’s Whitehill Formation with a thickness of more than 30 m. These estimates were made without any measurements on the actual available gas content of the shale. Such measurements were recently conducted on samples from two boreholes and are reported here. These measurements indicate that there is little to no desorbed and residual gas, despite high total organic carbon values. In addition, vitrinite reflectance and illite crystallinity of unweathered shale material reveal the Ecca Group to be metamorphosed and overmature. Organic carbon in the shale is largely unbound to hydrogen, and little hydrocarbon generation potential remains. These findings led to the conclusion that the lowest of the existing resource estimates, namely 0.4x109 m3 (13 Tcf, may be the most realistic. However, such low estimates still represent a large resource with developmental potential for the South African petroleum industry. To be economically viable, the resource would be required to be confined to a small, well-delineated ‘sweet spot’ area in the vast southern area of the basin. It is acknowledged that the drill cores we investigated fall outside of currently identified sweet spots and these areas should be targets for further scientific drilling projects. Significance: This is the first report of direct measurements of the actual gas contents of southern Karoo basin shales. The findings reveal carbon content of shales to be dominated by overmature organic matter. The results demonstrate a much reduced potential shale gas resource presented by the Whitehill

  17. Presence of the telescope fish Mendosoma lineatum in Patagonian waters, a new species in the ichthyological fauna from the south-west Atlantic Ocean.

    Science.gov (United States)

    Bovcon, N D; Cochia, P D; Ruibal Núñez, J; Vucica, M; Figueroa, D E

    2017-10-01

    The presence of the telescope fish Mendosoma lineatum in Patagonian waters of Argentina is reported. Mendosoma lineatum is the second species of the Latridae recorded in the south-west Atlantic Ocean and its presence in Patagonia is an addition to both the ichthyological fauna of the Argentinean Sea and the south-west Atlantic Ocean. © 2017 The Fisheries Society of the British Isles.

  18. Occurrence and origin of carbon dioxide in the Fushan Depression, Beibuwan Basin, South China Sea

    Energy Technology Data Exchange (ETDEWEB)

    Li, Meijun; Wang, Tieguan [Key Laboratory for Hydrocarbon Accumulation Mechanism of the Chinese Ministry of Education, Earth Sciences and Geoinformatics School, China University of Petroleum, Beijing 102200 (China); Liu, Ju; Wu, Weiqiang; Gao, Lihui [Petro China Southern Oil Exploration and Development Company, Guangzhou 510640 (China); Lu, Hong [Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640 (China)

    2008-06-15

    Natural gases produced from the Fushan Depression, Beibuwan Basin, South China Sea are generally rich in carbon dioxide. The {delta}{sup 13}C values of methane in these gases are within the range of -41.18 permille to -47.00 permille. This, together with the linearity of the {delta}{sup 13}C values of methane to butane in the ''natural gas plots,'' indicates that the hydrocarbon gases are of organic origin. The {delta}{sup 13}C{sub CO2} values of these gases are in the range of -5.1 permille to -7.5 permille, suggesting an inorganic origin. A dominant mantle source for the CO{sub 2} in these gases was determined on the basis of a simple binary mixing model using the {delta}{sup 13}C{sub CO2} values and {sup 3}He/{sup 4}He ratios of associated helium in these gases. The primary geological controls on the occurrence of CO{sub 2} rich gas accumulations in the Fushan Depression are discussed following a comparison with other sedimentary basins in the region. (author)

  19. India-Asia convergence: Insights from burial and exhumation of the Xigaze fore-arc basin, south Tibet

    Science.gov (United States)

    Li, Guangwei; Kohn, Barry; Sandiford, Mike; Xu, Zhiqin

    2017-05-01

    The composite fore-arc/syncollisional Xigaze basin in south Tibet preserves a key record of India-Asia collision. New apatite fission track and zircon (U-Th)/He data from an N-S transect across the preserved fore-arc basin sequence near Xigaze show a consistent northward Late Cretaceous to middle Miocene younging trend, while coexisting apatite (U-Th-Sm)/He ages are all Miocene. Corresponding detrital zircon U-Pb data are also reported for constraining the Cretaceous depositional ages of the Xigaze basin sequence in the region. Thermal history modeling indicates that the basin experienced northward propagating episodic exhumation, along with a northward migration of the depocenter and a pre-existing Cenozoic syncollisional basin sequence which had been removed. In the southern part, fore-arc exhumation commenced in the Late Cretaceous ( 89 ± 2 Ma). Following transition to a syncollisional basin in the Paleocene, sedimentation in the central and northern Xigaze basin continued until the latest Eocene ( 34 ± 4 Ma). Ongoing folding and thrusting (e.g., Great Counter Thrusts) caused by progressive plate convergence during late Oligocene-early Miocene time resulted in regional uplift and considerable basin denudation, which fed two fluvial basins along its northern and southern flanks and exposed the basement ophiolite. Subsequent incision of the Yarlung River resulted in Miocene cooling in the region. Different episodes in the exhumation history of the Xigaze basin, caused by thrusting of an accretionary wedge and ophiolitic basement, can be linked to changes in India-Asia convergence rates and the changing subduction pattern of the Indian and Neo-Tethyan slabs.

  20. Coalbed methane-produced water quality and its management options in Raniganj Basin, West Bengal, India

    Science.gov (United States)

    Mendhe, Vinod Atmaram; Mishra, Subhashree; Varma, Atul Kumar; Singh, Awanindra Pratap

    2017-06-01

    Coalbed methane (CBM) recovery is associated with production of large quantity of groundwater. The coal seams are depressurized by pumping of water for regular and consistent gas production. Usually, CBM operators need to pump >10 m3 of water per day from one well, which depends on the aquifer characteristics, drainage and recharge pattern. In India, 32 CBM blocks have been awarded for exploration and production, out of which six blocks are commercially producing methane gas at 0.5 million metric standard cubic feet per day. Large amount of water is being produced from CBM producing blocks, but no specific information or data are available for geochemical properties of CBM-produced water and its suitable disposal or utilization options for better management. CBM operators are in infancy and searching for the suitable solutions for optimal management of produced water. CBM- and mine-produced water needs to be handled considering its physical and geochemical assessment, because it may have environmental as well as long-term impact on aquifer. Investigations were carried out to evaluate geochemical and hydrogeological conditions of CBM blocks in Raniganj Basin. Totally, 15 water samples from CBM well head and nine water samples from mine disposal head were collected from Raniganj Basin. The chemical signature of produced water reveals high sodium and bicarbonate concentrations with low calcium and magnesium, and very low sulphate in CBM water. It is comprehend that CBM water is mainly of Na-HCO3 type and coal mine water is of Ca-Mg-SO4 and HCO3-Cl-SO4 type. The comparative studies are also carried out for CBM- and mine-produced water considering the geochemical properties, aquifer type, depth of occurrence and lithological formations. Suitable options like impounding, reverse osmosis, irrigation and industrial use after prerequisite treatments are suggested. However, use of this huge volume of CBM- and mine-produced water for irrigation or other beneficial purposes

  1. Simulation of the Lower Walker River Basin hydrologic system, west-central Nevada, using PRMS and MODFLOW models

    Science.gov (United States)

    Allander, Kip K.; Niswonger, Richard G.; Jeton, Anne E.

    2014-01-01

    Walker Lake is a terminal lake in west-central Nevada with almost all outflow occurring through evaporation. Diversions from Walker River since the early 1900s have contributed to a substantial reduction in flow entering Walker Lake. As a result, the lake is receding, and salt concentrations have increased to a level in which Oncorhynchus clarkii henshawi (Lahontan Cutthroat trout) are no longer present, and the lake ecosystem is threatened. Consequently, there is a concerted effort to restore the Walker Lake ecosystem and fishery to a level that is more sustainable. However, Walker Lake is interlinked with the lower Walker River and adjacent groundwater system which makes it difficult to understand the full effect of upstream water-management actions on the overall hydrologic system including the lake level, volume, and dissolved-solids concentrations of Walker Lake. To understand the effects of water-management actions on the lower Walker River Basin hydrologic system, a watershed model and groundwater flow model have been developed by the U.S. Geological Survey in cooperation with the Bureau of Reclamation and the National Fish and Wildlife Foundation.

  2. Oil source rock potential of the lacustrine Jurassic Sim Uuju formation, West Korea Bay Basin. Pt. 2; Nature of the organic matter and hydrocarbon-generation history

    Energy Technology Data Exchange (ETDEWEB)

    Massoud, M.S.; Scott, A.C.; Killops, S.D.; Mattey, D. (Royal Holloway and Bedford New Coll., Egham (United Kingdom)); Keeley, M.L. (Intera Information Technologies, Henley-on-Thames (United Kingdom))

    1993-07-01

    The offshore West Korea Bay (WKB) Basin is one of a series of NE-SW rift basins which formed in Korea and eastern China over thin continental crust during the Late Mesozoic and Early Cenozoic, and is characterised by a two-layered structure - a Cenozoic basin is superposed on a pre-Tertiary basin. In the earlier Part I of this paper paraffinic oils recovered from Mesozoic and Tertiary sandstone intervals were found to have been generated from different source beds. Also, a probable thick (400-500 m) Jurassic source bed for the Mesozoic oil was geochemically identified in the basinal offshore area of the lacustrine Sim Uuju sequence penetrated by Well 606. In this paper, the authors complete the hydrocarbons survey on the formation by studying the type, amount and maturity of organic matter present, and the history of hydrocarbon generation. They conclude that the Jurassic bed could be considered as a major source for the Mesozoic oil in the WKB Basin, provided that it is of a sufficient extent to have produced large volumes of oil. (Author)

  3. Vulnerability and adaptation to climate change in the Comoe River Basin (West Africa).

    Science.gov (United States)

    Yéo, Wonnan Eugène; Goula, Bi Tié Albert; Diekkrüger, Bernd; Afouda, Abel

    2016-01-01

    Climate change is impacting water users in many sectors: water supply, farming, industry, hydropower, fishing, housing, navigation and health. Existing situations, like population growth, movement of populations from rural to urban areas, poverty and pollution can aggravate the impacts of climate change. The aim of the study is to evaluate the vulnerability of different water user groups to climate change and define communities' adaptation strategies in the Comoe River Basin. Information was collected on communities' concerns and perception on changes in climate and potential adaptation measures and strategies. Results show that 95 % of the sample in the study communities had heard of it and are aware that climate change is occurring. They have been experiencing changes in economic activity and cropping pattern, reduced water level in rivers, crop failure, delay in cropping season, new pests and diseases, food insecurity, drop in income and decline in crop yield. Results also show that communities employ various adaptation strategies including crops diversification, substitution and calendar redefinition, agroforestry, borrowing from friends and money lenders and increasing fertilizer application.

  4. Kela-2: a major gas field in the Tarim Basin of west China

    Energy Technology Data Exchange (ETDEWEB)

    Shilin X; Xiuxiang L; Luofu L [University of Petroleum, Beijing (China). Basin and Reservoir Research Center; Zhonghua S [Daqing Oil Company (China). 5th Oil Production Factory; Xuejun P; Qiming L; Hulwen X [Tarim Oil Co., Xinjiang (China). Exploration Business Dept.

    2004-07-01

    Kela-2, a large gas field developed in a sub-thrust anticline within the Kuga depression of the Tarim Basin and with reserves of 7.55 x 10{sup 12} SCF, represents the largest unsegmented gas pool in China. Detailed petrographic, geochemical, structural and fluid inclusion studies show that the field is a result of a favourable interrelationship of geological events, involving several periods of compressive structuring, multiple periods of oil and gas migration and a complex diagenetic history. The Kela-2 discovery well encountered abundant oil and gas shows over a 448 m gas column within Cretaceous to Lower Tertiary Bashijiqike and Baxigai Formation sands. Gas is trapped in a large, heavily faulted, northeast-east striking fold with a de collement horizon developed along a gypsiferous horizon. The structure, with a closure of 55 km{sup 2}, was initiated in the Late Tertiary compressive phase and was accentuated during Quaternary Xiyu compression. The source of the gas is Triassic and Jurassic coals, which communicate with the reservoir vertically through faults. It is possible through fluid inclusion studies to identify two periods of secondary oil migration and two periods of re-migration within the reservoir. The reservoirs were deposited in a continental environment, within which secondary porosity has been developed by leaching of carbonate cement that infilled original primary pore spaces. The gypsiferous mudstones of the lower Tertiary provide a common seal to both reservoirs, which are abnormally pressured. (author)

  5. Mapping of a Hydrological Ice Sheet Drainage Basin on the West Greenland Ice Sheet Margin from ERS-1/2 SAR Interferometry, Ice-Radar Measurement, and Modelling

    DEFF Research Database (Denmark)

    Ahlstrøm, Andreas P.; Bøggild, C.E.; Stenseng, L.

    2002-01-01

    importance of the potential of the ice overburden pressure compared to the bedrock topography. The meltwater run-off for the basin delineations was modelled with an energy-balance model calibrated with observed ice-sheet ablation and compared to a 25 year time series of measured basin run-off. The standard......The hydrological ice-sheet basin draining into the Tasersiaq lake, West Greenland (66°13'N, 50°30'W), was delineated, First using standard digital elevation models (DEMs) for ice-sheet surface and bedrock, and subsequently using a new high-resolution dataset, with a surface DEM derived from repeat......-track interferometric synthetic aperture radar (SAR) and a bedrock topography derived from an airborne 60 MHz ice-penetrating radar. The extent of the delineation was calculated from a water-pressure potential as a function of the ice-sheet surface and bedrock elevations and a hydraulic factor κ describing the relative...

  6. Early to Middle Triassic sedimentary records in the Youjiang Basin, South China: Implications for Indosinian orogenesis

    Science.gov (United States)

    Qiu, Liang; Yan, Dan-Ping; Yang, Wen-Xin; Wang, Jibin; Tang, Xiangli; Ariser, Shahnawaz

    2017-06-01

    The Indosinian orogeny marks the termination of marine deposition and the accumulation of lower Permian to Late Triassic clastic sediments in the Youjiang Basin, South China Block. Major and trace element compositions of Early to Middle Triassic sedimentary clastic rocks from Youjiang Basin were analysed to constrain their provenance and tectonic setting. Argillaceous samples have low SiO2 (average 56.95 wt.%), Al2O3 (average 15.15 wt.%), and Fe2O3T + MgO (average 11.54 wt.%) contents, and high K2O/Na2O (average 15.61) and Al2O3/SiO2 (average 0.27) ratios, similar to mudstones from continental arc basins. Arenaceous samples have moderate SiO2 (average 76.98 wt.%), Al2O3 (average 8.41 wt.%), and Fe2O3T + MgO (average 5.29 wt.%) contents, and moderate Al2O3/SiO2 (average 0.11) and K2O/Na2O (average 15.26) ratios, identical to those of graywackes from continental island arcs or active continental margins. Both the argillaceous and arenaceous samples have low CIA values (57-85) and relatively high ICV values (0.69-2.11), indicating that the source rocks experienced weak chemical weathering and the sedimentary detritus was derived from an immature source. Compared with late Permian to Early Triassic South China granitoids and upper crust, the samples have lower contents of high-field-strength elements (e.g., Zr, Hf, Nb, and Ta) and large ion lithophile elements (e.g., Rb, Sr, Ba, Th, U, and Pb). However, their relatively high Rb concentrations (>51 ppm), and low Rb/Sr (0.16-4.19) and Th/U (2.66-5.21) ratios, are indicative of an igneous source from a continental arc that underwent weak chemical weathering. Both the argillaceous and arenaceous samples are moderately enriched in light rare earth elements and show relatively flat chondrite-normalized heavy rare earth element patterns (LaN/YbN = 6.61-17.35; average 10.61) with strong negative Eu anomalies (Eu/Eu* = 0.54-0.89; average 0.73). In tectonic discrimination diagrams, including Th-Sc-Zr/10 and La-Th-Sc plots, the

  7. The Spatio-Temporal Variation of Hydrochemical Characteristics in Yamzhog Yumco Basin, South Tibet

    Science.gov (United States)

    Zhe, M.; Zhang, X.

    2015-12-01

    From 2009 to 2014, more than 300 water samples of 52 sites from the five lakes and seven inflow rivers of Yumzhog Yumco Basin, South Tibet have been collected, and the hydrochemical types, sources of ions, and the spatial-temporal variation in waters analyzed annually. The basin waters are slightly saline or fresh because of the different sources of water replenishment, and are hardest water with weak alkalinity. The hydrochemical types of Yamzhog Yum Co, Puma Yum Co, Bajiu Co, Kongmu Co, and Chen Co are SO42--HCO3--Mg2+-Na+, HCO3--SO42--Mg2+, SO42--Mg2+-Na+, SO42--HCO3--Ca2+, and SO42--Na+-Mg2+-Ca2+, respectively. As for rivers, HCO3- together with SO42- is the major anion, and Ca2+ is the dominant cation. The weathering of evaporites and carbonatites, along with the evaporation-crystallization plays a significant role in the difference of hydrochemical compositions. In addition, anthropogenic impacts, such as the rapid tourism development and the utilization of Yamzhog Yumco hydropower should not be ignored. Compared with the salinity in 1984, Puma Yum Co has been desalinated obviously during 2009-2014 as a result of the accelerated glacier melt caused by the global warming. Furthermore, the Cl- concentration has decreased consequently with the increased evaporation from 2009 to 2014. Yamzhog Yum Co, the largest lake in this basin with a complex zigzag bank and a different inflow river system, exhibits remarkable spatial variation for its surface waters. The mineralization degree, and the concentration of Mg2+ and (Na++K+) are low with high concentration of Ca2+ in the river mouth entering into Yamzhog Yum Co. Moreover, the irregular changes in vertical direction can be attributed to the strong wind and comparatively abundant rainfall during the sampling period. To sum up, the combined impacts of environmental changes and human activities can account for the spatial distribution and temporal evolution of hydrochemical characteristics in Yamzhog Yumco Basin.

  8. Statistical distribution models for migratory fish in Jacuí basin, South Brazil

    Directory of Open Access Journals (Sweden)

    Thaís P. Alves

    Full Text Available The aim of the present study was to identify the distribution patterns of migratory fishes in the Jacuí river basin (Rio Grande do Sul, South Brazil, proposing a statistical model of presumed distribution based on geomorphologic environmental data. Through maps of occurrence probability, we hope to contribute to decisions regarding basin environmental management. The analyzed species were: Salminus brasiliensis (dourado, Leporinus obtusidens (piava, Prochilodus lineatus (grumatã and Pimelodus pintado (pintado. Samples were made through interviews with fishermen and local inhabitants, covering the main channel and tributaries of the rivers Jacuí, Taquari-Antas, Vacacaí, Vacacaí-Mirim, Pardo, Pardinho, Sinos, and Caí. The sampling program resulted in 204 interviews, being 187 considered as valid in 155 different sampling points. The probability of migratory fish occurrence was adjusted through the LOGIT routine of the Idrisi Andes Software: P = e(b0 + b1 . altitude + b2 . basin area . (1 + e(b0 + b1 . altitude + b2 . basin area-1, where P is the occurrence probability of the species (0-1 and b0, b1 and b2 are the equation parameters. Model accuracy, for estimating presence, ranged from 82% to 93%. Pimelodus pintado was cited to occur in 121 points among the 155 sampled (78.06%, Prochilodus lineatus in 72 (46.45%, L. obtusidens in 62 (40.00% and S. brasiliensis in 58 (37.42%. Equation parameters were estimated (± standard error as follow: S. brasiliensis: b0 = -2.8762 ± 0.2597; b1 = 1.3028 ± 0.0332; b2 = 1.1487 ± 0.0301; L. obtusidens: b0 = -0.8364 ± 0.2213; b1 = -1.5564 ± 0.0462; b2 = 0.9947 ± 0.0206; Prochilodus lineatus: b0= 0; b1= -1.3067 ± 0.0544; b2= 0.8128 ± 0.0177; Pimelodus pintado: b0= -0.9487 ± 0.3688; b1= -0.8269 ± 0.0496; b2= 0.9255 ± 0.0304.

  9. Quantifying sediment dynamics on alluvial fans, Iglesia basin, south Central Argentine Andes

    Science.gov (United States)

    Harries, Rebekah; Kirstein, Linda; Whittaker, Alex; Attal, Mikael; Peralta, Silvio

    2017-04-01

    Qualitative interpretations of environmental change drawn from alluvial fan stratigraphy typically tie the deposition of greater volumes of coarser sediment to wetter climatic periods. For example, step changes in sediment flux and discharge associated with glacial-interglacial cycles are often linked to the progradation and back stepping of a fan's toe (Harvey et al, 2002). Indeed, more recent quantitative stratigraphic models demonstrate changes in the volume and calibre of sediment fluxed from an uplifted catchment can produce predictable shifts in the rate at which fluvial deposits fine downstream (Duller et al. 2010, Armitage et al. 2011). These interpretations, however, make three important assumptions: 1) the volume and calibre of the sediment transferred from an eroding mountain belt to a depositional basin is directly related to climate through some value of time-averaged discharge or catchment wetness; 2) lateral sources of sediment, such as tributaries, do not significantly influence the pattern of deposition in a basin and, similarly, 3) the reworking of older fan surfaces is minimal and does not impact the depositional pattern of younger deposits. Here we demonstrate each of these assumptions underestimates the importance of variance in transportable grain sizes in influencing the local and basin-wide deposited grain size trends. Using the Iglesia basin in the Argentine south Central Andes as a natural laboratory, we compare three large, adjacent, alluvial fan systems whose catchments experience the same background tectonic and climatic forcing. We find regional climate forcing is not expressed uniformly in the downstream grain size fining rates of their modern systems. Furthermore, we observe the variance in transportable grain sizes supplied from each primary catchment and the variance of material introduced by tributaries and fan surfaces downstream can act as first order controls on the rate of downstream fining. We also raise the importance of

  10. Seasonal Variation in Water Quality of Orle River Basin, South West ...

    African Journals Online (AJOL)

    The study reveal that the chemical indices of pollution such as Biochemical Oxygen Demand (BOD5), and Dissolved Oxygen (DO) vary significantly between the seasons. Likewise, Biochemical Oxygen Demand (BOD5), Dussolved Oxygen (DO) and Chemical Oxygen Demand (COD) show increase in the wet season and ...

  11. Groundwater nitrate pollution in Souss-Massa basin (south-west ...

    African Journals Online (AJOL)

    EJIRO

    deuterium data, was carried out to identify the sources of this pollution. According to the spatial distribution of nitrate contents, .... Massa region are δ18O-enriched relative to those of. Souss region and they are plotted under the ... The observed isotopic enrichment of δ18O that concerns groundwater in Chtouka-Massa area ...

  12. An integrated geological and geophysical study of the Uinta Mountains, Utah, Colorado and a geophysical study on Tamarix in the Rio Grande River basin, West Texas

    Science.gov (United States)

    Khatun, Salma

    2008-07-01

    This research consists of two parts. One part deals with an integrated analysis of the structural anomaly associated with the Uinta Mountains, Utah. The other part deals with a study on the effect of Tamarix on soil and water quality. The Uinta Mountains are an anomalous east-west trending range of the Central Rocky Mountains and are located in northeastern Utah and northwestern Colorado. They have long been recognized as a structural anomaly that is surrounded by other Laramide structures that trend N-S or northwest. The study area extends from -112 to -108 degrees longitude and 41.5 to 39 degrees latitude and consists of three major geologic features: The Green River basin, Uinta Mountains, and the Uinta basin. This study investigates the tectonic evolution and the structural development of the Uinta aulacogen. There is a growing interest in exploration for petroleum and other hydrocarbons in the area of this study. Oil companies have been drilling wells in this area since the 1950's. The results of this study will enhance the existing knowledge of this region, and thus will help in the pursuit of hydrocarbons. A highly integrated approach was followed for this investigation. Gravity, magnetic, drill hole, seismic and receiver function data were used in the analysis. Gravity and magnetic data were analyzed using software tools available in the Department of Geological Sciences such as Oasis Montaj and GIS. Filtered gravity maps show that the Uinta Mountains and the surrounding basins and uplifts are deep seated features. These maps also reveal a correlation between the Uinta Mountains and the regional tectonic structures. This correlation helps in understanding how the different tectonic events that this region went through contributed to the different phases of development of the Uinta aulacogen. Four gravity models were generated along four north-south trending profile lines covering the target area from east to west. Interpretations of these models give a

  13. Smear Posetive Pulmonary Tuberculosis (PTB) Prevalence Amongst Patients at Agaro Teaching Health Center, South West Ethiopia.

    Science.gov (United States)

    Ali, Hussen; Zeynudin, Ahmed; Mekonnen, Abiyu; Abera, Solomon; Ali, Solomon

    2012-03-01

    World Health organization (WHO) declared tuberculosis as a global emergency because it poses a serious public health threat in different countries especially, in Africa. According to WHO report of 2007, Directly Observed Treatment Short course (DOTS) coverage in Ethiopia reached 95 percent of the population; despite this fact the trend of tuberculosis in most of the districts of Ethiopia is not known. Hence, this study has revealed the trend and determined the overall prevalence of smear positive pulmonary tuberculosis in five years (2005/6-2009/10) in Agaro teaching health center, south west Ethiopia. A retrospective study based on record review was conducted at Agaro Teaching Health center on sputum examination record of patient's from 2005/6-2009/10(five years). Socio demographic data and sputum laboratory results were collected using pre-designed questionnaire and the data was entered into a computer using SPSS version 16 for windows. Finally, cross tab analysis and Chi-square was calculated at P-value less than 0.05 to check possible association between socio-demographic variables and smear positivity. The overall five years prevalence of smear positive pulmonary tuberculosis was found out to be 10.9%. On the other hand, the percentage of smear positive pulmonary tuberculosis cases showed gradual decrease from 19.5% in 2005/6 to 5.8% cases in 2009/10. Tuberculosis is still the major problem of Agaro health center catchment area even though there is a decrease in trend from year to year. Hence, the respective health bureau and other stake holders should still need to strengthen their effort to control it.

  14. Fungal Contamination of Indoor Public Swimming Pools, Ahwaz, South-west of Iran.

    Science.gov (United States)

    Rafiei, A; Amirrajab, N

    2010-01-01

    Using public swimming pools during different seasons and poor health behavior could be responsible in transmission of fungal disease through pool water and its environment. Therefore, this research was conducted to investigate fungal agents of indoor public swimming pools of Ahwaz, capital city of Khouzestan Province, south-west of Iran. Ten indoor swimming pools of Ahwaz were investigated during two seasons for 6 months. Water specimens were collected by pump and environment samples including shower-bath area, margin of pool walls, dressing rooms, and slippers, by sterile carpet pieces. All specimens were cultured in SC and SCC culture media and fungal agents identification were based on macroscopic, microscopic characteristic and complement tests when it was necessary. Data analyzing was performed using SPSS version 13 for descriptive analyzing. A total of 593 samples were collected from different parts of pools. Interestingly in 13 samples from environmental places, dermatophytes were isolated as follows: Trichophyton mentagrophytes, T. rubrum, T. verrucosum and Epidermophyton floccosum 5, 4, 3 and 1 cases respectively. Ten cases of dermatophytes were isolated from floor of dressing area. Three hundred seventy two saprophytic fungi species and 32 yeasts were recovered from water and environment surfaces samples. Aspergillus, Penicillium and Mucor were the most common isolated saprophytic fungi. Existence of saprophytic fungi and yeast in pools water seems to be an indicator of their resistance to detergent agents. In addition, yeast water contamination could be from swimmers. Dermatophytes isolation from pools environment areas and foot washing sink, reveals the importance of public swimming pools in disease transmission. Because dressing places are being used by all of the swimmers, take care of hygienic discipline in these places should be noted by health policy markers.

  15. High maternal mortality in rural south-west Ethiopia: estimate by using the sisterhood method

    Directory of Open Access Journals (Sweden)

    Yaya Yaliso

    2012-11-01

    Full Text Available Abstract Background Estimation of maternal mortality is difficult in developing countries without complete vital registration. The indirect sisterhood method represents an alternative in places where there is high fertility and mortality rates. The objective of the current study was to estimate maternal mortality indices using the sisterhood method in a rural district in south-west Ethiopia. Method We interviewed 8,870 adults, 15–49 years age, in 15 randomly selected rural villages of Bonke in Gamo Gofa. By constructing a retrospective cohort of women of reproductive age, we obtained sister units of risk exposure to maternal mortality, and calculated the lifetime risk of maternal mortality. Based on the total fertility for the rural Ethiopian population, the maternal mortality ratio was approximated. Results We analyzed 8503 of 8870 (96% respondents (5262 [62%] men and 3241 ([38%] women. The 8503 respondents reported 22,473 sisters (average = 2.6 sisters for each respondent who survived to reproductive age. Of the 2552 (11.4% sisters who had died, 819 (32% occurred during pregnancy and childbirth. This provided a lifetime risk of 10.2% from pregnancy and childbirth with a corresponding maternal mortality ratio of 1667 (95% CI: 1564–1769 per 100,000 live births. The time period for this estimate was in 1998. Separate analysis for male and female respondents provided similar estimates. Conclusion The impoverished rural area of Gamo Gofa had very high maternal mortality in 1998. This highlights the need for strengthening emergency obstetric care for the Bonke population and similar rural populations in Ethiopia.

  16. Birth Preparedness and Complication Readiness among Women Attending Antenatal Clinics in Ogbomoso, South West, Nigeria

    Directory of Open Access Journals (Sweden)

    Ajibola Idowu, MBBS, FWACP

    2015-10-01

    Full Text Available Background: Information on factors associated with birth preparedness and complication readiness (BP/CR is central in designing cost effective programs for reducing maternal deaths among women. This study assessed factors influencing BP/CR among pregnant women attending antenatal clinic in Ogbomoso, South West Nigeria. Methodology: This is a cross-sectional study conducted between January and April, 2015. Systematic sampling technique was employed to recruit 400 women attending antenatal clinic at Bowen University Teaching Hospital, Ogbomoso, Nigeria. A pre-tested questionnaire was used for data collection and data analysis was done using SPSS version 21. Chi-square test was used for bivariate analysis while binary logistic regression was used for multivariate analysis. Statistical significance was set at p <0.05. Results: More than half (51.3% of our respondents were in the 30-39 age category. Only 40.3% of these respondents were reported well prepared for births and were complication ready. The proportion of women who had BP/CR was significantly higher among those in the middle socio-economic group (51.6%, p<0.05, those who practiced Christianity (76.4%, p<0.05 and those from Yoruba ethnic group (80.1%, p<0.05. Respondents in lower socio-economic group were 42% less likely to have prepared for birth compared to women in the high socio-economic class (OR: 0.58, 95% CI: 0.34-0.99. Conclusion and Global Health Implications: The proportion of Nigerian women in our sample who were well-prepared for birth and its complication was below average. There is need for more awareness programs on BP/CR; such programs should target all women especially the vulnerable group

  17. Breast-feeding pattern and onset of menstruation among Yoruba mothers of South-west Nigeria.

    Science.gov (United States)

    Kuti, Oluwafemi; Adeyemi, Adebayo B; Owolabi, Alexander T

    2007-12-01

    To determine the breast-feeding practices and duration of lactational amenorrhoea among women within the first year of delivery in a Nigerian population. Cross-sectional study carried out between January 2005 and April 2006, among mothers within one year of delivery, who were attending the Infant Welfare Clinic at Wesley Guild Hospital, Ilesa, Nigeria. Using a semi-structured questionnaire, mothers were interviewed to obtain information regarding their socio-demographic characteristics, parity, breast-feeding habits, use of contraception and onset of menstruation after delivery. Information obtained was analysed using the Statistical Package for Social Sciences (SPSS) software version 11. All 268 (100%) mothers interviewed breast-fed their babies, 261 (97.4%) of which for at least 6 months. Most (71.6%) suckled exclusively for 6 months and more; only 10 (3.7%) never carried out exclusive breast-feeding. Age, parity and educational level did not affect the duration of exclusive breast-feeding. Lactational amenorrhoea lasted 3 months or more in 229 (85.5%) of the mothers. Of the 174 who exclusively breast-fed for 6 months, 109 (62.6%) remained amenorrhoeic during that time and, hence, met the criteria for use of LAM contraception. Exclusive breast-feeding among nursing mothers is highly prevalent among Yoruba mothers of South-west Nigeria. Since lactational amenorrhoea lasts 6 months in about two-thirds of the women nursing for that period of time, there is a great potential for the application of LAM for contraception.

  18. Knowledge Regarding Organ Donation and Willingness to Donate among Health Workers in South-West Nigeria.

    Science.gov (United States)

    Oluyombo, R; Fawale, M B; Ojewola, R W; Busari, O A; Ogunmola, O J; Olanrewaju, T O; Akinleye, C A; Oladosu, Y O; Olamoyegun, M A; Gbadegesin, B A; Obajolowo, O O; Soje, M O; Adelaja, A; Ayodele, L M; Ayodele, O E

    2016-01-01

    Organ transplantation program in developing countries is still significantly dwarfed. Health workers are undeniably important in the success of transplantation. To assess the knowledge and attitude of health workers toward organ donation in South-West Nigeria with a view to explaining reasons for these shortcomings. In a cross-sectional study conducted on 850 health care workers, self-administered questionnaires were used to obtain information from participants. Of 850 participants, 766 (90.1%) returned their completed questionnaires. The mean±SD age of participants was 36.7±9.2 years. Majority (93.3%) of participants had heard of organ donation; 82.5% had desirable knowledge. Only 29.5% and 39.4% would be willing to donate and counsel potential organ donors, respectively; 36.5% would consider signing organ donation cards. Only 19.4% believed that organ transplantation is often effective and 63.4% believed they were permitted by their religion to donate. Permission by religion (OR 3.5; 95% CI 2.3 to 5.3), good knowledge (OR 2.9; 95% CI 1.4 to 5.7), readiness to sign donation cards (OR 2.6; 95% CI 1.7 to 3.8), discuss organ donation (OR 2.7; 95%CI 8.0 to 63.8), and knowing somebody who had donated (OR 2.9) independently influenced willingness to donate organ. There is disparity in knowledge of organ donation and willingness to donate among health care workers. Efforts should be intensified to give comprehensive and appropriate education to health care workers about organ donation to bridge this gap.

  19. The Contribution of Occult Precipitation to Nutrient Deposition on the West Coast of South Africa

    Science.gov (United States)

    2015-01-01

    The Strandveld mediterranean-ecosystem of the west coast of South Africa supports floristically diverse vegetation growing on mostly nutrient-poor aeolian sands and extending from the Atlantic Ocean tens of kilometers inland. The cold Benguela current upwelling interacts with warm onshore southerly winds in summer causing coastal fogs in this region. We hypothesized that fog and other forms of occult precipitation contribute moisture and nutrients to the vegetation. We measured occult precipitation over one year along a transect running inland in the direction of the prevailing wind and compared the nutrient concentrations with those in rainwater. Occult deposition rates of P, N, K, Mg, Ca, Na, Al and Fe all decreased with distance from the ocean. Furthermore, ratios of cations to Na were similar to those of seawater, suggesting a marine origin for these. In contrast, N and P ratios in occult precipitation were higher than in seawater. We speculate that this is due to marine foam contributing to occult precipitation. Nutrient loss in leaf litter from dominant shrub species was measured to indicate nutrient demand. We estimated that occult precipitation could meet the demand of the dominant shrubby species for annual N, P, K and Ca. Of these species, those with small leaves intercepted more moisture and nutrients than those with larger leaves and could take up foliar deposits of glycine, NO3-, NH4+ and Li (as tracer for K) through leaf surfaces. We conclude that occult deposition together with rainfall deposition are potentially important nutrient and moisture sources for the Strandveld vegetation that contribute to this vegetation being floristically distinct from neighbouring nutrient-poor Fynbos vegetation. PMID:26017747

  20. A Survey on Ectoparasite Infestations in Companion Dogs of Ahvaz District, South-west of Iran

    Directory of Open Access Journals (Sweden)

    AR Alborzi

    2012-06-01

    Full Text Available Background: The objective was to determine the prevalence of ectoparasite infestations in referred companion dogs to veterinary hospital of Shahid Chamran University of Ahvaz, from 2009 to 2010.Methods: A total of 126 dogs were sampled for ectoparasites and examined by parasitological methods. The studied animals were grouped based on the age (3 years, sex, breed and regionResults: Thirty six out of 126 referred dogs (28.57% were positive for external ectoparasites. The most common ectoparasites were Heterodoxus spinigera, which were recorded on 11 dogs (8.73%. Rhipicephalus sanguineus, Sarcoptes scabiei, Otodectes cynotis, Xenopsylla cheopis, Cetenocephalides canis, Cetenocephalides felis, Hip­pobosca sp. and myiasis (L3 of Lucilia sp. were identified on 9 (7.14%, 7 (5.56%, 6 (4.76%, 3 (2.38%, 3 (2.38%, 2 (1.59%, 2 (1.59% and one (0.79% of the studied dogs respectively. Mixed infestation with two species of ectoparasites was recorded on 8 (6.35%. Prevalence was higher in male dogs (35.82%; 24 out of 67 than females (20.34%; 12 out of 59, age above 3 years (31.81%; 7 out of 22 and in the season of winter (30.95%; 13 out of 42, but the difference was not significant regarding to host gender, age and season (P>0.05.Conclusion: Apparently this is the first study conducted in companion dogs of Ahvaz District, South-west of Iran. Our results indicated that lice and ticks were the most common ectoparasites in dogs of this area. The zoonotic nature of some ectoparasites can be regard as a public health alert

  1. Isolation of Brachyspira Pilocicoli from Gastrointestinal Tract of Commercial Chickens in Khuzestan, South West Iran

    Directory of Open Access Journals (Sweden)

    Leila Alavi

    2013-11-01

    Full Text Available Background: Brachyspira pilosicoli is an intestinal spirochete which colonizes in cecum, colon and rectum of the birds. This infection in broiler and laying chicken may cause disorders such as: diarrhea, reduced egg production, pasty vents, fecal staining of egg shells, poor shell quality, pale egg yolks, increased feed consumption, slower growth and poor feed digestion. Objectives: The aim of this study was to isolate and identify B. pilosicoli from broiler and laying chicken. Materials and Methods: This study was conducted by using bacteriological examination and PCR in Khuzestan located in the South West of Iran. Totally 150 samples of broiler chicken feces and 100 samples of laying chicken feces were collected. The samples were cultured on blood agar containing three antibiotics (vancomycin 12.5μg/mL, spiramaycin 25μg/mL and spectinomycin 400 μg/mL.The colonies of intestinal spirochetes were studied by PCR. Results: Intestinal spirochetes were isolated in 21 out of 150 fecal samples of broiler chicken and in 9 out of 100 fecal samples of laying chicken. Species identification of isolates was done by PCR using 16SrRNA gene specific for B. pilosicoli. B. pilosicoli was isolated in 13 out of 21 positive broilers and in 4 out of 9 positive laying chickens. Conclusions: This study showed that B. pilosicoli exists in the broiler and laying chicken in the region. This intestinal pathogen may be considered as a major cause of production threats and economic losses in chicken farms in the region of study.

  2. Optimal feeding systems for small-scale dairy herds in the North West Province, South Africa.

    Science.gov (United States)

    Manzana, N Patience; McCrindle, Cheryl M E; Sebei, P Julius; Prozesky, Leon

    2014-07-09

    Land redistribution was legislated in 1994; it was designed to resolve historical imbalances inland ownership in South Africa. Between 2002 and 2006, a longitudinal observational studywas conducted with 15 purposively selected small-scale dairy farmers in a land redistributionproject in Central North West Province. Four farmers left the project over the period. For thepurposes of this study, a small-scale dairy farm was defined as a farm that produces less than500 L of milk a day, irrespective of the number of cows or size of the farm. The study wasconducted in three phases. In the first phase, situational analysis using participatory ruralappraisal (PRA) and observation was used to outline the extent of the constraints and designappropriate interventions. Feeds that were used were tested and evaluated. In the secondphase, three different feeding systems were designed from the data obtained from PRA. Thesewere: (1) A semi-intensive farm-based ration using available crops, pastures and crop residueswith minimal rations purchased. (2) An intensive, zero-grazing dairy system using a totalmixed ration. (3) A traditional, extensive or dual-purpose system, where the calf drank fromthe cow until weaning and milking was done only once a day. In the third phase, adoptionwas monitored. By July 2006, all remaining farmers had changed to commercially formulatedrations or licks and the body condition score of the cows had improved. It was concluded thatveterinary extension based on PRA and a holistic systems approach was a good option forsuch complex problems. Mentoring by commercial dairy farmers, veterinary and extensionservices appeared to be viable. Further research should be done to optimise the traditionalmodel of dairy farming, as this was relatively profitable, had a lower risk and was less labourintensive.

  3. Optimal feeding systems for small-scale dairy herds in the North West Province, South Africa

    Directory of Open Access Journals (Sweden)

    N. Patience Manzana

    2014-02-01

    Full Text Available Land redistribution was legislated in 1994; it was designed to resolve historical imbalances inland ownership in South Africa. Between 2002 and 2006, a longitudinal observational studywas conducted with 15 purposively selected small-scale dairy farmers in a land redistributionproject in Central North West Province. Four farmers left the project over the period. For thepurposes of this study, a small-scale dairy farm was defined as a farm that produces less than500 L of milk a day, irrespective of the number of cows or size of the farm. The study wasconducted in three phases. In the first phase, situational analysis using participatory ruralappraisal (PRA and observation was used to outline the extent of the constraints and designappropriate interventions. Feeds that were used were tested and evaluated. In the secondphase, three different feeding systems were designed from the data obtained from PRA. Thesewere: (1 A semi-intensive farm-based ration using available crops, pastures and crop residueswith minimal rations purchased. (2 An intensive, zero-grazing dairy system using a totalmixed ration. (3 A traditional, extensive or dual-purpose system, where the calf drank fromthe cow until weaning and milking was done only once a day. In the third phase, adoptionwas monitored. By July 2006, all remaining farmers had changed to commercially formulatedrations or licks and the body condition score of the cows had improved. It was concluded thatveterinary extension based on PRA and a holistic systems approach was a good option forsuch complex problems. Mentoring by commercial dairy farmers, veterinary and extensionservices appeared to be viable. Further research should be done to optimise the traditionalmodel of dairy farming, as this was relatively profitable, had a lower risk and was less labourintensive.

  4. Routine antenatal syphilis screening in South west Nigeria- a questionable practice.

    Science.gov (United States)

    Olubukola, Adesina; Adesina, Oladokun

    2010-06-01

    Untreated maternal syphilis is strongly associated with adverse birth outcomes, especially in women with high titre syphilis. The WHO recommends routine serological screening in pregnancy. Some workers have advised a reappraisal of this practice, having demonstrated low sero-prevalence in their antenatal population. In view of this, the aim of this study was to determine the seroprevalence of syphilis in the antenatal population presenting at a major hospital in south-west Nigeria. This was a cross sectional study of healthy pregnant Nigerian women attending Adeoyo Maternity Hospital in the capital of Oyo State. The case record of every pregnant woman presenting for their first antenatal clinic visit over a 4-month period (September 1st to December 31st 2006) was reviewed. During the study period, two thousand six hundred and seventy-eight women sought antenatal care. Three hundred and sixty-nine women (369; 13.4%) had incomplete records and were excluded from analysis. The records of the 2,318(86.6%) women with adequate records were subsequently reviewed. The mean age of the women was 27.4 years (± 5.34) and the mean gestational age 26.4 weeks (±6.36). The modal parity was 0. Only three patients were found to be reactive for syphilis giving a prevalence of 0.13%. The sero- prevalence value in this study is quite low and may justify the call to discontinue routine antenatal syphilis screening. However, a more rigorous screening program using diagnostic tests with higher sensitivity maybe necessary before jettisoning this traditional aspect of antenatal care.

  5. Air quality impacts of motor vehicle emissions in the south coast air basin: Current versus more stringent control scenario

    Science.gov (United States)

    Collet, Susan; Kidokoro, Toru; Sonoda, Yukihiro; Lohman, Kristen; Karamchandani, Prakash; Chen, Shu-Yun; Minoura, Hiroaki

    2012-02-01

    States are working to comply with the ozone National Ambient Air Quality Standards (NAAQS). Often, regulations restricting vehicle emissions are promulgated in order to attain compliance with the NAAQS. Currently, more stringent vehicle emission regulations are being considered by government agencies. This paper compares emissions from passenger cars and light duty trucks under the current California Low Emission Vehicle (LEV II) standards to a control scenario which was anticipated in 2008 to become LEV III (referred to as "more stringent control" in this paper) and determines if the scenario would result in additional improvements to air quality in California's South Coast Air Basin. The air quality modeling was performed using the Community Multi-scale Air Quality Model (CMAQ) for years 2005, 2014 and 2020. The more stringent control sensitivity study simulated a scenario in which all new passenger cars and light duty trucks in the California South Coast Air Basin in year 2016 achieve Super Ultra-Low Emission Vehicle (SULEV) tail pipe emissions, zero evaporative emissions and more stringent aggressive driving requirements. The total on-road vehicles emissions difference when averaged across the South Coast Air Basin showed the more stringent scenario compared to LEV II to have reductions of 1% for oxides of nitrogen (NO x), 1% for as reactive organic gases (ROG) and 5% for carbon monoxide (CO) in 2030. LEV II modeled ozone levels in the western areas of the basin increased in 2014 and 2020 as compared to 2005, because these areas are VOC-sensitive and the reductions in NO x emissions in these regions are larger than the VOC reductions. In other areas of the South Coast Basin, ozone is reduced by 1.5% or less. The more stringent control scenario modeled levels of ozone have a maximum decrease from LEV II levels by 1% or less in 2014 and 1.5% or less in 2020.

  6. Seismic stratigraphy and sedimentary architecture of the Chalk Group in south-west Denmark

    DEFF Research Database (Denmark)

    Larsen, Connie; Ineson, Jon; Boldreel, Lars Ole

    2014-01-01

    The article focuses on a study undertaken by the Chalk Group on the western onshore region of the Danish Basin in Eastern Denmark related on the seismic stratigraphy and sedimentary architecture of the region. The study is undertaken through subdividing the northern North German Basin and the sou......-western Danish Basin on digital reflection using 2-dimensional digital and scanned seismic profiling. The results of the study sh regional trends related to the active indicate active inversion....

  7. The "3-Basins" Project in Mid South America and the Geometry of the Deep Nazca Subducted Slab

    Science.gov (United States)

    Assumpcao, M.; Bianchi, M.; Rocha, M., Sr.; Azevedo, P. A. D.

    2016-12-01

    A multi-national two-year deployment of 50 stations covering SW Brazil, Eastern Bolivia, Paraguay, NE Argentina and NW Uruguay will better map the crustal and upper mantle structure in this yet unexplored part of the South American plate. We aim at studying how deep structure and mantle convection controls the evolution of three intracratonic basins: Pantanal, Chaco-Paraná, and Paraná. The Quaternary Pantanal Basin is especially interesting because of its present subsidence and possible influence from Andean flexural effects as well as from deep mantle convection associated with the Nazca slab . The Nazca slab has a flat segment, just above the 660-km discontinuity (beneath the Chaco Basin in Paraguay), and then plunges beneath the Pantanal Basin reaching about 1000 km depth in SE Brazil (Schimmel et al., 2003; Rocha et al. 2011; Simmons et al., 2012). To the north of the Pantanal Basin, the Nazca slab seems to plunge directly through the transition zone without any deep flat segment. Initial studies of receiver functions from the transition zone were made using stations of the permanent Brazilian Seismic Network: the cold Nazca slab makes the 660-km discontinuity deeper between the Peru-Brazil border and the Pantanal basin, but does not affect the discontinuity depth beneath the Paraná basin further to the east. It is expected that the newly deployed temporary stations will significantly improve the maping of the geometry of the Nazca slab within and below the upper mantle transition zone in South America. Work supported by FAPESP grant 2103/24215-6.

  8. Have abrupt climate variations of the last glacial possibly been muted in the south-west African tropics by counteracting mechanisms?

    Science.gov (United States)

    Hessler, I.; Dupont, L.; Handiani, D.; Steinke, S.; Groeneveld, J.; Merkel, U.; Paul, A.

    2012-04-01

    The last glacial period including the last deglaciation (73.5-10 ka BP) is characterised by abrupt shifts between extreme climatic conditions. Millennial-scale climate variations associated with North Atlantic Heinrich Stadials (HSs) are thought to be transmitted by both the atmospheric and oceanic circulation resulting in a near-global footprint. It is further thought that HSs are closely related to a reduction or shut-down of the Atlantic Meridional Overturning Circulation, which, according to the bipolar-seesaw hypothesis, leads to the accumulation of heat in the South Atlantic. In addition, it is hypothesised that HSs result in a southward shift of the Intertropical Convergence Zone which then would likely influence the vegetation composition in the African tropics. To investigate the impact of HSs on the terrestrial African realm and the south-east Atlantic we reconstructed the vegetation development in Angola and the southern Congo Basin as well as the sea surface temperatures (SST) of the south-east Atlantic using marine sediments of ODP Site 1078 (11° 55'S, 13° 24'E, 427 m water depth). Two species of planktonic foraminifera were selected to reconstruct variations in surface water conditions in the south-east Atlantic. Due the ecological and seasonal preferences of Globigerinoides ruber (pink) this species provides a good tool to estimate SST variations during the southern hemisphere summer. In contrast, Globigerina bulloides is representing the Benguela Upwelling System during the southern hemisphere winter. While Mg/Ca-based SSTs of G. ruber (pink) were significantly higher by 1° -2° C during periods of abrupt climate change, the impact of HSs during southern hemisphere winter is less obvious. However, although there are several vegetation records that show an impact of HSs in the African tropics, our high-resolution pollen record from ODP Site 1078 reflects no vegetation changes during periods of HSs. Model simulations conducted with an Earth System

  9. Simulation of efficiency impact of drainage water reuse: case of small-scale vegetable growers in North West Province, South Africa

    NARCIS (Netherlands)

    Speelman, S.; Haese, D' M.F.C.; Haese, D' L.

    2011-01-01

    This paper focuses on estimating the effect of drainage water reuse on the technical efficiency of small-scale vegetable growers in South Africa applying a data envelopment analysis (DEA). In the semi-arid North West Province of South Africa water scarcity and the soon to be implemented water

  10. Comparison of the rift and post-rift architecture of conjugated salt and salt-free basins offshore Brazil and Angola/Namibia, South Atlantic

    Science.gov (United States)

    Strozyk, Frank; Back, Stefan; Kukla, Peter A.

    2017-10-01

    This study presents a regional comparison between selected 2D seismic transects from large, conjugated salt and salt-free basins offshore southern Brazil (Campos Basin, Santos Basin, Pelotas Basin) and southwest Africa (Kwanza Basin, northern and southern Namibe Basin, Walvis Basin). Tectonic-stratigraphic interpretation of the main rift and post-rift units, free-air gravity data and flexural isostatic backstripping were used for a comprehensive basin-to-basin documentation of key mechanisms controlling the present-day differences in conjugated and neighbouring South Atlantic basins. A significant variation in the tectonic-sedimentary architecture along-strike at each margin and between the conjugated basins across the South Atlantic reflects major differences in (1) the structural configuration of each margin segment at transitional phase between rifting and breakup, as emphasized in the highly asymmetric settings of the large Santos salt basin and the conjugated, salt-free southern Namibe Basin, (2) the post-breakup subsidence and uplift history of the respective margin segment, which caused major differences for example between the Campos and Espirito Santo basins and the conjugated northern Namibe and Kwanza basins, (3) variations in the quantity and distribution of post-breakup margin sediments, which led to major differences in the subsidence history and the related present-day basin architecture, for example in the initially rather symmetric, siliciclastic Pelotas and Walvis basins, and (4) the deposition of Aptian evaporites in the large rift and sag basin provinces north of the Rio Grande Rise and Walvis Ridge, highly contrasting the siliciclastic basins along the margin segments south of the ridges. The resulting present-day architecture of the basins can be generally classified as (i) moderately symmetric, salt-free, and magma-rich in the northern part of the southern segment, (i) highly asymmetric, salt-bearing and magma-poor vs. salt-free and magma

  11. A 500-year history of floods in the semi arid basins of south-eastern Spain

    Science.gov (United States)

    Sánchez García, Carlos; Schulte, Lothar; Peña, Juan Carlos; Carvalho, Filpe; Brembilla, Carla

    2016-04-01

    Floods are one of the natural hazards with higher incidence in the south-eastern Spain, the driest region in Europe, causing fatalities, damage of infrastructure and economic losses. Flash-floods in semi arid environments are related to intensive rainfall which can last from few hours to days. These floods are violent and destructive because of their high discharges, sediment transport and aggradation processes in the flood plain. Also during historical times floods affected the population in the south-eastern Spain causing sever damage or in some cases the complete destruction of towns. Our studies focus on the flood reconstruction from historical sources of the Almanzora, Aguas and Antas river basins, which have a surface between 260-2600 km2. We have also compiled information from the Andarax river and compared the flood series with the Guadalentín and Segura basins from previous studies (Benito et. al., 2010 y Machado et al., 2011). Flood intensities have been classified in four levels according to the type of damage: 1) ordinary floods that only affect agriculture plots; 2) extraordinary floods which produce some damage to buildings and hydraulic infrastructure; 3) catastrophic floods which caused sever damage, fatalities and partial or complete destruction of towns. A higher damage intensity of +1 magnitude was assigned when the event is recorded from more than one major sub-basin (stretches and tributaries such as Huércal-Overa basin) or catchment (e.g. Antas River). In total 102 incidences of damages and 89 floods were reconstructed in the Almanzora (2.611 km2), Aguas (539 km2), Antas (261 km2) and Andarax (2.100 km2) catchments. The Almanzora River was affected by 36 floods (1550-2012). The highest events for the Almanzora River were in 1580, 1879, 1973 and 2012 producing many fatalities and destruction of several towns. In addition, we identified four flood-clusters 1750-1780, 1870-1900, 1960-1977 and 1989-2012 which coincides with the periods of

  12. Reconstruction of the Mesozoic subduction in the South China Sea and its implications on the opening of the South China Sea basins

    Science.gov (United States)

    Li, F.; Sun, Z.; Yang, H.

    2013-12-01

    Reconstruction of the Mesozoic subduction system in the South China Sea (SCS) can improve our understanding of the tectonic evolution in the region and holds important implications on the opening of the SCS basins. Here we report the locations of the Mesozoic volcanic arc and trench in the SCS based on satellite-derived magnetic and gravimetric data, as well as drilling data from the China National Offshore Oil Corporation. The magnetic data allows us to identify the volcanic arc, which is characterized as high positive magnetic anomaly (HPMA) due to serpentinization. Furthermore, the volcanic arc is verified by distributions of intermediate rocks that are determined from the drilling data. The gravimetric data is used to determine the locations of the Mesozoic trench. Our preliminary results show two distinct HPMA belts along the two sides of the SCS basins. The first one locates northwest to the ridge axis of the SCS basins and extends from Taiwan in the northeast to the Xisha Island in the southwest. The second one locates on the Nansha-Dangerous Ground, southeast to the opening axis of the southwest sub-basin of the SCS, and is nearly parallel to the orientation of the first one. In addition, the distribution of intermediate rocks within the two HPMA belts indicates that the two belts represent the present locations of the Mesozoic volcanic arc. Furthermore, we recognize the corresponding Mesozoic trench by peak gross horizontal gradient of bouguer gravity anomaly in the northeastern SCS. It is located northwest to the ridge axis of the SCS basins and southeast to the Mesozoic arc. Moreover, drilling sample MZ-1-1 from the area between the Mesozoic arc and trench has shown clear signatures of forearc basin sediments, providing additional support to our arc and trench locations. Based on the opening direction of the SCS basins, we interpret that the two HPMA belts belong to the same Mesozoic volcanic arc that is located on the Eurasia continental crust. The arc

  13. Basin Analysis and Petroleum System Characterisation of Western Bredasdorp Basin, Southern Offshore of South Africa: Insights from a 3d Crust-Scale Basin Model - (Phase 1)

    Science.gov (United States)

    Sonibare, W. A.; Scheck-Wenderoth, M.; Sippel, J.; Mikeš, D.

    2012-04-01

    In recent years, construction of 3D geological models and their subsequent upscaling for reservoir simulation has become an important tool within the oil industry for managing hydrocarbon reservoirs and increasing recovery rate. Incorporating petroleum system elements (i.e. source, reservoir and trap) into these models is a relatively new concept that seems very promising to play/prospect risk assessment and reservoir characterisation alike. However, yet to be fully integrated into this multi-disciplinary modelling approach are the qualitative and quantitative impacts of crust-scale basin dynamics on the observed basin-fill architecture and geometries. The focus of this study i.e. Western Bredasdorp Basin constitutes the extreme western section of the larger Bredasdorp sub-basin, which is the westernmost depocentre of the four southern Africa offshore sub-basins (others being Pletmos, Gamtoos and Algoa). These basins, which appear to be initiated by volcanically influenced continental rifting and break-up related to passive margin evolution (during the Mid-Late Jurassic to latest Valanginian), remain previously unstudied for crust-scale basin margin evolution, and particularly in terms of relating deep crustal processes to depo-system reconstruction and petroleum system evolution. Seismic interpretation of 42 2D seismic-reflection profiles forms the basis for maps of 6 stratigraphic horizons which record the syn-rift to post-rift (i.e. early drift and late drift to present-day seafloor) successions. In addition to this established seismic markers, high quality seismic profiles have shown evidence for a pre-rift sequence (i.e. older than Late Jurassic >130 Ma). The first goal of this study is the construction of a 3D gravity-constrained, crust-scale basin model from integration of seismics, well data and cores. This basin model is constructed using GMS (in-house GFZ Geo-Modelling Software) while testing its consistency with the gravity field is performed using IGMAS

  14. Carbon monoxide degassing from seismic fault zones in the Basin and Range province, west of Beijing, China

    Science.gov (United States)

    Sun, Yutao; Zhou, Xiaocheng; Zheng, Guodong; Li, Jing; Shi, Hongyu; Guo, Zhengfu; Du, Jianguo

    2017-11-01

    Degassing of carbon monoxide (CO), which plays a significant role in the contribution of deep carbon to the atmosphere, commonly occurs within active fault zones. CO degassing from soil to the atmosphere in the Basin and Range province, west of Beijing (BRPB), China, was investigated by in-situ field measurements in the active fault zones. The measured concentrations of CO in soil gas in the BRPB ranged from 0.29 × 10-6 to 1.1 × 10-6 with a mean value of 0.6 × 10-6, which is approximately twice as large as that in the atmosphere. Net fluxes of CO degassing ranged from -48.6 mg m-2 d-1 to 12.03 mg m-2 d-1. The diffusion of CO from soil to the atmosphere in the BRPB was estimated to be at least 7.6 × 103 ton/a, which is comparable to the corresponding result of about 1.2 × 104 ton/a for CO2. CO concentrations were spatially heterogeneous with clearly higher concentrations along the NE-SW trending in the BRPB. These elevated values of CO concentrations were also coincident with the region with low-velocity and high conductivity in deep mantle, and high Poisson's ratio in the crust, thereby suggesting that CO degassing from the soil might be linked to upwelling of the asthenospheric mantle. Other sources of CO in the soil gas are suggested to be dominated by chemical reactions between deep fluids and carbonate minerals (e.g., dolomite, limestone, and siderite) in country rocks. Biogenic processes may also contribute to the CO in soil gas. The spatial distribution patterns of CO concentrations are coincident with the stress field, suggesting that the concentrations of CO could be a potential indicator for crustal stress field and, hence is potential useful for earthquake monitoring in the BRPB.

  15. Evaluation on uncertainty sources in projecting hydrological changes over the Xijiang River basin in South China

    Science.gov (United States)

    Yuan, Fei; Zhao, Chongxu; Jiang, Yong; Ren, Liliang; Shan, Hongcui; Zhang, Limin; Zhu, Yonghua; Chen, Tao; Jiang, Shanhu; Yang, Xiaoli; Shen, Hongren

    2017-11-01

    Projections of hydrological changes are associated with large uncertainties from different sources, which should be quantified for an effective implementation of water management policies adaptive to future climate change. In this study, a modeling chain framework to project future hydrological changes and the associated uncertainties in the Xijiang River basin, South China, was established. The framework consists of three emission scenarios (ESs), four climate models (CMs), four statistical downscaling (SD) methods, four hydrological modeling (HM) schemes, and four probability distributions (PDs) for extreme flow frequency analyses. Direct variance method was adopted to analyze the manner by which uncertainty sources such as ES, CM, SD, and HM affect the estimates of future evapotranspiration (ET) and streamflow, and to quantify the uncertainties of PDs in future flood and drought risk assessment. Results show that ES is one of the least important uncertainty sources in most situations. CM, in general, is the dominant uncertainty source for the projections of monthly ET and monthly streamflow during most of the annual cycle, daily streamflow below the 99.6% quantile level, and extreme low flow. SD is the most predominant uncertainty source in the projections of extreme high flow, and has a considerable percentage of uncertainty contribution in monthly streamflow projections in July-September. The effects of SD in other cases are negligible. HM is a non-ignorable uncertainty source that has the potential to produce much larger uncertainties for the projections of low flow and ET in warm and wet seasons than for the projections of high flow. PD contributes a larger percentage of uncertainty in extreme flood projections than it does in extreme low flow estimates. Despite the large uncertainties in hydrological projections, this work found that future extreme low flow would undergo a considerable reduction, and a noticeable increase in drought risk in the Xijiang

  16. Testing orbital forcing in the Eocene deltaic sequences of the South-Pyrenean Foreland Basins.

    Science.gov (United States)

    Garcés, Miguel; López-Blanco, Miguel; Valero, Luis; Beamud, Elisabet; Pueyo-Morer, Emilio; Rodríguez-Pinto, Adriana

    2014-05-01

    Paleoclimate proxy records from marine pelagic sediments show that a link exists between long-period orbital cyclicity and the pattern of high latitude glaciations. Thus, a sound possibility exist that transgressive-regressive third-order sequences from shallow marine environments reflect long-period orbital (glacioeustatic) forcing, as suggested from a variety of shallow marine settings of different ages, from Mesozoic to Paleogene. In this study we aim at testing the role of the 400 kyr eccentricity cycle in the sequential organization of the Late Eocene deltaic sequences of the Belsue-Atares Formation, in the Jaca-Pamplona Basin. The overall record spans from latest Lutetian to early Priabonian and consists of nearly 1000 meters of siliciclastic deltaic to mixed platform sequences of various scales. Very notorious lateral changes in both stratigraphic thickness and sedimentary facies witness the synkinematic character of these sediments, deposited simultaneously to intrabasinal fold growth. A magnetostratigraphy based chronostratigraphic framework is used, first, to determine the age and duration of the sequences and, second, to establish a robust correlation with other deltaic sequences within the south-pyrenean foreland. The long-distance correlation exercise is used to discriminate between local (tectonic) and global (climatic) forcing factors, under the assumption that climate signature is synchronous, while tectonic forcing is prone to yield diachronic units at basin scale. Astronomical tuning with the 400-kyr cycle of the eccentricity solution of the Earth orbit is attempted on the basis of derived magnetostratigraphic age constrains. Our results suggest that transgressive (regressive) trends correlate with maxima (minima) of eccentricity cycle, a phase-relationship which is compatible with a base-level (accommodation) driven forcing.

  17. Impact of Permeability and Mineralization on an Injected Carbon Dioxide Plume in the South Georgia Rift Basin.

    Science.gov (United States)

    Alshammari, A.; Brantley, D.; Knapp, C. C.; Lakshmi, V.

    2016-12-01

    We will study the injection of one million tons per year of super critical phase carbon dioxide in the South Georgia Rift Basin for a 30-year period followed by a 100-year shut-in. We will determine the fault leakage coefficient corresponding to a logarithmic range of subsurface permeability and the mineralization of the injected carbon dioxide. This will help to predict the migration patterns of the sequestered carbon dioxide in the subsurface. These simulations for carbon dioxide flow and mineralization rate and the volume of mineral trapping will use the Computer Modeling Group™ (CMG) software. The simulations will extend to several decades to determine the end products of the system. The South Georgia Rift Basin is located in the Southeastern portion of United States and has been the location for recent studies of carbon dioxide sequestration.

  18. Pelagic communities of the South West Indian Ocean seamounts: R/V Dr Fridtjof Nansen Cruise 2009-410

    Science.gov (United States)

    Rogers, A. D.; Alvheim, O.; Bemanaja, E.; Benivary, D.; Boersch-Supan, P.; Bornman, T. G.; Cedras, R.; Du Plessis, N.; Gotheil, S.; Høines, A.; Kemp, K.; Kristiansen, J.; Letessier, T.; Mangar, V.; Mazungula, N.; Mørk, T.; Pinet, P.; Pollard, R.; Read, J.; Sonnekus, T.

    2017-02-01

    The seamounts of the southern Indian Ocean remain some of the most poorly studied globally and yet have been subject to deep-sea fishing for decades and may face new exploitation through mining of seabed massive sulphides in the future. As an attempt to redress the knowledge deficit on deep-sea benthic and pelagic communities associated mainly with the seamounts of the South West Indian Ridge two cruises were undertaken to explore the pelagic and benthic ecology in 2009 and 2011 respectively. In this volume are presented studies on pelagic ecosystems around six seamounts, five on the South West Indian Ridge, including Atlantis Bank, Sapmer Seamount, Middle of What Seamount, Melville Bank and Coral Seamount and one un-named seamount on the Madagascar Ridge. In this paper, existing knowledge on the seamounts of the southwestern Indian Ocean is presented to provide context for the studies presented in this volume. An account of the overall aims, approaches and methods used primarily on the 2009 cruise are presented including metadata associated with sampling and some of the limitations of the study. Sampling during this cruise included physical oceanographic measurements, multibeam bathymetry, biological acoustics, and net sampling of phytoplankton, macrozooplankton and micronekton/nekton. The studies that follow reveal new data on the physical oceanography of this dynamic region of the oceans, and the important influence of water masses on the pelagic ecology associated with the seamounts of the South West Indian Ridge. New information on the pelagic fauna of the region fills an important biogeographic gap for the mid- to high-latitudes of the oceans of the southern hemisphere.

  19. Geophysical evidence for gas hydrates in the deep water of the South Caspian Basin, Azerbaijan

    Energy Technology Data Exchange (ETDEWEB)

    Diaconescu, C.C. [Cornell University, Ithaca, NY (United States). Dept. of Geological Sciences; National Institute for Earth Physics, Bucharest (Romania); Kieckhefer, R.M. [Chevron Overseas Petroluem Inc., San Ramon, CA (United States); Knapp, J.H. [Cornell University, Ithaca, NY (United States). Dept. of Geological Sciences; University of South Carolina, Columbia, SC (United States). Dept. of Geological Sciences

    2001-07-01

    New 2-D seismic reflection data from the South Caspian Sea, offshore Azerbaijan, document for the first time in the deep water (up to 650m) of this area, the presence of gas hydrates. Geophysical evidence for gas hydrates consists of a shallow (300-500m below seafloor) zone of pronounced high velocity ({approx}2,100m/s) as compared with the surrounding sediments (1550-1600m/s). This zone appears on the seismic data as a depth-limited ({approx}200m thick) layer extending down the flank of an elongated structural high, and displays seismic blanking effects on the sedimentary section. A strong positive-polarity (R{sub c}{approx}0.123) reflector marks the top of this velocity anomaly, and is interpreted as the top of the gas hydrate layer. Similarly, a high-amplitude (R{sub c}{approx}0.11), negative polarity reflector coincides with the base of the high velocity layer, and is interpreted as the base of the hydrate zone. Both the top and bottom of the hydrate layer approximately parallel the seafloor bathymetry, and cut discordantly across the stratigraphic section, suggesting that the two reflectors are thermobaric and not stratigraphic interfaces. Decreasing amplitude with offset at the base of the gas hydrate layer may indicate the accumulation of free gas beneath this interface. These gas hydrates fall within the hydrate stability field predicted from thermobaric modelling for the South Caspian Basin, but typically in thinner layers than would be expected from theoretical calculations. The minimum predicted water depth that allows hydrate formation is {approx}150m, and the maximum predicted thickness of the gas hydrate stability field is {approx}1350m. (Author)

  20. Geologic Mapping of the Lunar South Pole, Quadrangle LQ-30: Volcanic History and Stratigraphy of Schroedinger Basin

    Science.gov (United States)

    Mest, S. C.; Berman, D. C.; Petro, N. E.

    2009-01-01

    In this study we use recent images and topographic data to map the geology and geomorphology of the lunar South Pole quadrangle (LQ-30) at 1:2.5M scale [1-4] in accordance with the Lunar Geologic Mapping Program. Mapping of LQ-30 began during Mest's postdoctoral appointment and has continued under the PG&G Program, from which funding became available in February 2009. Preliminary map-ping and analyses have been done using base materials compiled by Mest, but properly mosaicked and spatially registered base materials are being compiled by the USGS and should be received by the end of June 2009. The overall objective of this research is to constrain the geologic evolution of the lunar South Pole (LQ-30: 60deg -90deg S, 0deg - +/-180deg ) with specific emphasis on evaluation of a) the regional effects of basin formation on the structure and composition of the crust and b) the spatial distribution of ejecta, in particular resulting from formation of the South Pole-Aitken (SPA) basin and other large basins. Key scientific objectives include: 1) Constraining the geologic history of the lunar South Pole and examining the spatial and temporal variability of geologic processes within the map area. 2) Constraining the vertical and lateral structure of the lunar regolith and crust, assessing the distribution of impact-generated materials, and determining the timing and effects of major basin-forming impacts on crustal structure and stratigraphy in the map area. And 3) assessing the distribution of resources (e.g., H, Fe, Th) and their relationships with surface materials.

  1. Prevalence of low back pain among peasant farmers in a rural community in South West Nigeria.

    Science.gov (United States)

    Fabunmi, A A; Aba, S O; Odunaiya, N A

    2005-09-01

    This study is a survey conducted in Iju-Odo rural community of Ondo State in South West Nigeria to determine the prevalence and risk factors for low back pain amongst peasant farmers. Five hundred peasant farmers were selected using a multi-stage sampling technique. A questionnaire was administered which sought information on demographic characteristics, presence of low back pain in the last 12 months prior to the time of the study and the duration, severity of low back pain and its effect on farming activity. The five hundred peasant farmers that participated in this study were 276 men (55.2%) and 224 women (44.8%). Three hundred and sixty two peasant farmers (72.4% of the population) had low back pain in the last 12 months prior to the time of this study, of which two hundred and three (73.5%) were males and one hundred and fifty nine (71.0%) were females peasant farmers having low back pain. The nature of onset of low back pain was that of gradual onset in 57.5%. One hundred and eighty-eight (51.9%) respondents indicated that low back pain reduced their farming workload, while one hundred and twenty four (34.3%) respondents were prevented from going to farm because they could not walk, resulting in 675 work days being lost by one hundred and twenty one (24.2%) peasant farmers in the last one-year with a mean of 5.6 days lost. This study concluded that low back pain prevalence is high among peasant farmers, with higher prevalence in males compared with females (P<0.05). The prevalence also increased with age (P<0.05). Years of farming was found to have a significant influence on the prevalence of low back pain (P<0.05) with prevalence of low back pain increasing as years of farming increases. Low back pain was found to be a cause of work absenteeism in this working population.

  2. The new face of rheumatic heart disease in South West Nigeria

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    Akinwusi PO

    2013-05-01

    Full Text Available Patience Olayinka Akinwusi,1,2 Johnson Olarewaju Peter,2 Adebayo Tolulope Oyedeji,2 Abiona Oluwadamilola Odeyemi21Department of Medicine, College of Health Sciences, Osun State University, 2Department of Medicine, LAUTECH Teaching Hospital, Osogbo, Osun State, NigeriaPurpose: To determine the current prevalence of rheumatic heart disease (RHD, clinical features, types of valvular lesions, complications and mortality, at Ladoke Akintola University of Technology (LAUTECH Teaching Hospital, Osogbo, South West Nigeria.Methods: We conducted a retrospective, descriptive study of all the cases of RHD seen in the medical outpatient clinics and wards of LAUTECH for 9 years, from January 2003 to December 2011. Statistical analysis of data obtained was done using SPSS 16. Results: The total number of attendees of all the medical outpatient clinics during the 9-year period was 67,378, with a subset of 9423 attending the cardiology clinic. There were 11 cases of RHD, which translates to a prevalence of 0.16/1000 and 1.2/1000 for medical outpatient clinics and the cardiology clinic respectively. The mean age of the patients was 25.64 ± 9.65 years, age range 14–40 years and male to female ratio of 1:1.2. The most common valve affected was mitral (90.9%, followed by the aortic (36.4%, and the tricuspid (18.2%. Mitral and aortic lesions coexisted in 18.2% of the patients, and late presentation was common in all RHD cases. Heart failure was the most common complication (90.9%. Other complications were secondary pulmonary hypertension (36.4%, infective endocarditis (27.3%, atrial fibrillation (27.3%, cardioembolic cerebrovascular disease (18.2%, and atrial flutter (9.1%. Mortality was 9.1%, while only one patient (9.1% had definitive surgery. Financial constraints precluded others from having definitive surgery.Conclusion: The prevalence of RHD has declined considerably as a result of improvements in the primary health care delivery system, with widespread use

  3. High resolution modeling of tropical cyclones-ocean interactions in the South-West Indian Ocean.

    Science.gov (United States)

    Chanut, J.; Samson, G.; Giordani, H.; Barbary, D.; Drillet, Y.

    2016-02-01

    The ocean surface can cool by several degrees during the passage of a tropical cyclone (TC) due to the extreme winds associated with. This cooling decreases the ocean-to-atmosphere heat and moisture supply which can modulate the TC intensity. Hence, atmospheric models need an accurate description of the sea surface temperature (SST) under TCs to correctly predict their intensities. This SST evolution and its feedback on the TC evolution can only be captured by ocean-atmosphere coupled models. In order to evaluate this potential benefit on TC forecasts in the South West Indian Ocean, Mercator-Ocean has developed a new coupled regional model based on the Meteo-France operational atmospheric model AROME and the NEMO ocean model. Exchanges between the two models are handled by the OASIS3 coupler. AROME is initialized and forced at its lateral boundaries with ALADIN 10km-resolution 6-hourly analysis and is integrated during 96 hours at 2.5km convective-resolving resolution. NEMO is initialized and forced with global 1/4° oceanic analyses performed weekly at Mercator-Ocean and is integrated at 1/12° eddy-resolving resolution. An ensemble of 25 coupled simulations and 25 atmospheric-only (forced) simulations based on 5 different TCs over the 2008-2013 seasons are then computed to explore the sensitivity of the TC hindcast to the SST. The ensemble is generated by varying the initial simulation time with a 6-hours step. A clear improvement of the SST evolution under the TCs is observed in the coupled simulations when compared to satellite data. This SST difference directly impacts turbulent latent and sensible heat fluxes spatial distribution and intensities, which lead to different intensification rates in the coupled and the forced simulations. The intensity hindcast mean error is significantly reduced in the coupled ensemble for hindcast ranges extending from 36h up to 96h. A statistical analysis confirms the robustness of this intensity hindcast improvement achieved

  4. Chloroquine-resistant Plasmodium vivax malaria in Serbo town, Jimma zone, south-west Ethiopia.

    Science.gov (United States)

    Ketema, Tsige; Bacha, Ketema; Birhanu, Tarekegn; Petros, Beyene

    2009-07-30

    Ethiopia has the highest proportion of vivax malaria, approximately 40% of all malaria infections, in contrast to African countries. Chloroquine (CQ) is the drug of choice for the treatment of Plasmodium vivax infection in the country, although CQ resistant P. vivax (CRPv) has started to challenge the efficacy of the drug. The present study was conducted to assess the current status of CRPv at Serbo, Jimma zone, south-west Ethiopia. A 28-day in vivo therapeutic efficacy test was conducted from October 2007 to January 2008. Recurrence of parasitaemia and the clinical condition of patients were assessed on each visit during the follow-up. The levels of haemoglobin (Hb) in the study participants were determined. The patients' blood drug levels were measured using HPLC. Data was analysed using SPSS for windows version 10.0. HPLC data was computed using Chem Station for LC 3D systems software. Of the total 84 patients included in the study, 78 completed their 28-day follow-up, six of whom being excluded for different reasons. In three children (aged 7, 12 and 13 years), parasitaemia reappeared within the 28-days follow-up in spite of adequate absorption of the drug and absence of malaria symptom. In addition, on the day of recurrence of parasitaemia the levels of chloroquine-desethylchloroquine (CQ-DCQ) were above the minimum effective concentration (>or=100 etag/ml) in all the three cases, showing that treatment failure could not be attributed to low level of drug in the patients blood. Reappearance of the parasite within the 28 days of follow-up is due to parasite resistance to CQ. The 3.6% (95% CI = -0.038 - 0.0758) prevalence of CRPv malaria in the study area signals the need for launching monitory activities for CQ resistant P. vivax. Moreover, as former report from the same country, Debrezeit, also showed the occurrence of CRPv, survey on CRPv malaria should be made in P. vivax endemic areas in order to estimate the level of burden across the country.

  5. Spatial and Temporal Variability of Rainfall over the South-West Coast of Bangladesh

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    Md. Sarwar Hossain

    2014-04-01

    Full Text Available This study examined the spatial and temporal rainfall variability from the 1940s to 2007 in the south west coastal region of Bangladesh. Time series statistical tests were applied to examine the spatial and temporal trends in three time segments (1948–1970, 1971–1990 and 1991–2007 and four seasons (Pre-monsoon; Monsoon; Post-Monsoon and Winter, during the period 1948–2007. Eight weather stations were divided into two zones: exposed (exposed to sea and interior (distant to sea. Overall, rainfall increased during the period 1948–2007, while the trends intensified during post-1990s. Post-monsoon and winter rainfall was observed to follow significant positive trends at most weather stations during the time period 1948–2007. The rate of change was found in exposed zone and interior zone are +12.51 and +4.86 mm/year, respectively, over post monsoon and +0.9 and +1.86 mm/year, respectively, over winter. These trends intensified both in the exposed zone (+45.81 mm/year and the interior zone (+27.09 mm/year 1990 onwards. Winter rainfall does not exhibit significant change (p > 0.1 over the exterior or interior zone, though individual stations like Jessore, Satkhira and Bhola show significant negative trends after 1990s. Although the trends were observed to weaken in the monsoon and pre-monsoon seasons, they are not significant. Moreover, an 11-year cyclicity was found within these two seasons, whilst no cyclicity was observed in the post-monsoon and winter seasons. Sequential Mann Kendal test reveals that the changes in two zones rainfall trends are started around mid-80s, where step change found only for fours season in Khulna stations and also for winter seasons in all weather stations. These changes may have a detrimental effect on rain-fed agriculture in Bangladesh. The application of palaeo-environmental techniques, threshold determination and rainfall analysis across the whole country could be useful to support adaptation planning of

  6. A Survey of Star Clusters in the M31 South-West Field. UBVRI Photometry and Multi-Band Maps

    OpenAIRE

    Narbutis, D.; Vansevicius, V.; Kodaira, K.; Bridzius, A.; Stonkute, R.

    2008-01-01

    A new survey of star clusters in the South-West field of the M31 disk based on the high resolution Subaru Suprime-Cam observations is presented. The UBVRI aperture CCD photometry catalog of 285 objects (V < 20.5; 169 of them identified for the first time) is provided. Each object is supplemented with multi-band color maps presented in the electronic edition of the Astrophysical Journal Supplement. Seventy seven star cluster candidates from the catalog are located in the Hubble Space Telescope...

  7. Late Pleistocene glacial stratigraphy of the Kumara-Moana region, West Coast of South Island, New Zealand

    OpenAIRE

    Barrows, TT; Almond, P; Rose, R.; Fifield, LK; Mills, SC; Tims, SG

    2013-01-01

    On the South Island of New Zealand, large piedmont glaciers descended from an ice cap on the Southern Alps onto the coastal plain of the West Coast during the late Pleistocene. The series of moraine belts and outwash plains left by the Taramakau glacier are used as a type section for interpreting the glacial geology and timing of major climatic events of New Zealand and also as a benchmark for comparison with the wider Southern Hemisphere. In this paper we review the chronology of advances by...

  8. EMPIRICAL ANALYSIS OF THE ENTREPRENEURIAL ENVIRONMENT AT REGIONAL LEVEL IN ROMANIA. CASE STUDY: THE REGION OF SOUTH-WEST OLTENIA

    Directory of Open Access Journals (Sweden)

    BĂLĂCESCU ANIELA

    2016-10-01

    Full Text Available The present study is a descriptive statistic of the regional entrepreneurial environment in Romania, focusing on South-West Oltenia, with the aim that surprised the level of entrepreneurship in this area. In this study we considered the demographic analysis of active enterprises at the 8 development regions of Romania, the survival rate of enterprises, the competitiveness, and profile of the entrepreneur. The period under review is 2008-2014, and the main sources of information were the databases of the National Institute of Statistics and the National Trade Register Office

  9. The implications of wood exploitation for fish smoking on mangrove ecosystem conservation in the South West Province, Cameroon

    OpenAIRE

    Mario, G.M.; Njisuh, Z. F.

    2008-01-01

    In this study we investigated how the use of mangrove wood for fish smoking by local people in some localities of the South West (SW) Province of Cameroon may be in conflict with the conservation and sustainability of mangrove ecosystems. With the use of socio-economic surveys, from February to July 2006, we established that the amount of the annual fuel-wood harvest for five study sites was about 102,650 m3 (i.e., an amount equivalent to clearing about 205.3 ha of mangrove forests annually)....

  10. Two Late Pleistocene climate-driven incision/aggradation rhythms in the middle Dnieper River basin, west-central Russian Plain

    Science.gov (United States)

    Panin, Andrei; Adamiec, Grzegorz; Buylaert, Jan-Pieter; Matlakhova, Ekaterina; Moska, Piotr; Novenko, Elena

    2017-06-01

    In valleys of the River Seim and its tributaries in the middle Dnieper basin (west-central Russian Plain), two low terraces (T1, 10-16 m, and T0, 5-7 m above the river) and a floodplain (2-4 m) with characteristic large and small palaeochannels exist. A range of field and laboratory techniques was applied and ∼30 new numerical ages (OSL and 14C dates) were obtained to establish a chronology of incision and aggradation events that resulted in the current valley morphology. Two full incision/aggradation rhythms and one additional aggradation phase from the previous rhythm were recognized in the Late Pleistocene - Holocene climate cycle. The following events were detected. (1) Late MIS 5 - early MIS 4: aggradation of Terrace T1 following the deep incision at the end of MIS 6. (2) Late MIS 4 (40-30 ka): incision into Terrace T1 below the present-day river, formation of the main scarp in the bottom of the valley between Terrace T1 and Terrace T0/Floodplain levels. (3) MIS 2: aggradation of Terrace T0, lateral migrations of a shallow braided channel located few meters above the present-day river since ∼25 ka through the LGM. (4) 18-13 ka: incision into Terrace T0 below the modern river. Multiple-thread channels concentrated in a single flow that at some places formed large meanders. In the period 15-13 ka, high floods that rose above the present-day floods left large levees and overbank loams on Terrace T0. (5) Younger Dryas - Holocene transition: aggradation up to the modern channel level, transformation of large Late Glacial to small Holocene meanders. The established incision/aggradation rhythms are believed to be manifested over the Central Russian Plain outside the influence of ice sheets in the north and base level changes in the south. The two-phase deepening of the valley occurred in the last quarter of the last glacial epoch but can not be attributed directly to the glacial-interglacial transition. Both the detected incision events correspond to relatively

  11. Detecting crop yield reduction due to irrigation-induced soil salinization in South-West Russia

    Science.gov (United States)

    Argaman, E.; Beets, W.; Croes, J.; Keesstra, S.; Verzandvoort, S.; Zeiliguer, A.

    2012-04-01

    The South-European part of the Russian Federation has experienced serious land degradation in the form of soil salinization since the 1960s. This land degradation was caused by intensive, large-scale irrigation on reclaimed land in combination with the salt-rich nature of the substrate. Alkaline soil salinity is believed to be an important factor decreasing crop yield in this area. A large research effort has been directed to the effects of soil salinity on crops, there is a need for simple, easily determinable indicators of crop health and soil salinity in irrigated systems, that can help to detect crop water stress in an early stage. The objectives of this research were to study the effects of soil salinity and vegetation water stress on the performance of alfalfa crop yield and physiological crop properties, and to study the possibility to measure soil salinity and alkalinity and the crop water stress index at plot level using a thermal gun and a regular digital camera. The study area was located in Saratov District, in the South-West part of Russia. Variables on the surface energy balance, crop properties, soil properties and visible reflectance were measured on plots with alfalfa cultures in two fields with and without signs of alkaline soil salinity, and with and without irrigation in July 2009. The research showed no clear adverse effects of soil salinity and soil alkalinity on crop yield and physiological crop properties. Soil salinity, as reflected by the electric conductivity, positively affected the root biomass of alfalfa in the range of 0.15 to 1.52 dS/m . This was a result of EC levels being below the documented threshold to negatively affect Alfalfa, as would be the case in truly saline soils. The soil pH also showed a positive correlation with root biomass within the range of pH 6.2 and 8.5 . From the literature these pH values are generally believed to be too high to exhibit a positive relationship with root biomass. No relationship was found

  12. Chemistry of runoff and shallow ground water at the Cattlemans Detention basin site, South Lake Tahoe, California, August 2000-November 2001

    Science.gov (United States)

    Prudic, David E.; Sager, Sienna J.; Wood, James L.; Henkelman, Katherine K.; Caskey, Rachel M.

    2005-01-01

    A study at the Cattlemans detention basin site began in November 2000. The site is adjacent to Cold Creek in South Lake Tahoe, California. The purpose of the study is to evaluate the effects of the detention basin on ground-water discharge and changes in nutrient loads to Cold Creek, a tributary to Trout Creek and Lake Tahoe. The study is being done in cooperation with the Tahoe Engineering Division of the El Dorado County Department of Transportation. This report summarizes data collected prior to and during construction of the detention basin and includes: (1) nutrient and total suspended solid concentrations of urban runoff; (2) distribution of unconsolidated deposits; (3) direction of ground-water flow; and (4) chemistry of shallow ground water and Cold Creek. Unconsolidated deposits in the area of the detention basin were categorized into three classes: fill material consisting of a red-brown loamy sand with some gravel and an occasional cobble that was placed on top of the meadow; meadow deposits consisting of gray silt and sand with stringers of coarse sand and fine gravel; and a deeper brown to yellow-brown sand and gravel with lenses of silt and sand. Prior to construction of the detention basin, ground water flowed west-northwest across the area of the detention basin toward Cold Creek. The direction of ground-water flow did not change during construction of the detention basin. Median concentrations of dissolved iron and chloride were 500 and 30 times higher, respectively, in ground water from the meadow deposits than dissolved concentrations in Cold Creek. Median concentration of sulfate in ground water from the meadow deposits was 0.4 milligrams per liter and dissolved oxygen was below the detection level of 0.3 milligrams per liter. The relatively high concentrations of iron and the lack of sulfate in the shallow ground water likely are caused by chemical reactions and biological microbial oxidation of organic matter in the unconsolidated deposits

  13. Potential for atmospheric-driven lead paint degradation in the South Coast Air Basin of California.

    Science.gov (United States)

    Cohan, Alexander J; Edwards, Rufus D; Kleinman, Michael T; Dabdub, Donald

    2009-12-01

    Exposure to lead in paint or lead residues in house dust and soil is one of the leading environmental risks to the health of children in the United States. Components of photochemical smog can increase the degradation of binders in lead paint, leading to increased release of lead pigment granules to hands in surface contact or for deposition in house dust and soil. This study uses photochemical air quality modeling to map areas susceptible to increased lead paint degradation as a result of photochemical atmospheric pollutants to prioritize areas of concern. Typical air quality episodes in the South Coast Air Basin of California (SoCAB) are modeled for the 1970s, 1980s, and 1990s. Results indicate that large areas of the SoCAB were susceptible to atmospheric-driven accelerated lead paint degradation. Inner city urban areas from central Los Angeles to Azusa and most of Orange County had the highest susceptibility to accelerated lead paint degradation, followed by inland locations near the San Bernardino Mountains. This study identifies photochemical oxidant gases as contributors to greater lead release from indoor painted surfaces in urban areas.

  14. First record of Annonaceae wood for the Neogene of South America, Amazon Basin, Brazil

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    Emilio Alberto Amaral Soares

    Full Text Available ABSTRACT: The relief of the regions of Manaus and Itacoatiara, Central Amazon, is supported by Neogene siliciclastic rocks, bounded at the base and top by lateritic paleosols and covered by quaternary sedimentary deposits from the Solimões-Amazon river system. This unit is informally assigned to the Novo Remanso Formation, consists of usually reddish and ferruginized sandstones, conglomerates and pelites, with few identified fossil records, a fact that has hindered its stratigraphic position, and the paleoenvironmental reconstruction of the last phase of the Amazon Basin settling. This study describes, for the first time, the occurrence of fossil wood in outcroppings of the left bank of the Amazon River, where anatomical and morphological data has enabled its characterization to the species level. Thus, the data marks the record of the Annonaceae in South America, as well as the depositional processes related to incorporation of organic material in the sandy layer and the fossilization processes that allowed its preservation. In an unprecedented way, this study has described Duguetiaxylon amazonicum nov. gen and sp. and provided information on the anatomical and systematic character, as well as data on plant-insect interaction, and a better understanding of the family.

  15. The Volta Basin Water Allocation System: assessing the impact of small-scale reservoir development on the water resources of the Volta basin, West Africa

    Directory of Open Access Journals (Sweden)

    R. Kasei

    2009-08-01

    Full Text Available In the Volta Basin, infrastructure watershed development with respect to the impact of climate conditions is hotly debated due to the lack of adequate tools to model the consequences of such development. There is an ongoing debate on the impact of further development of small and medium scale reservoirs on the water level of Lake Volta, which is essential for hydropower generation at the Akosombo power plant. The GLOWA Volta Project (GVP has developed a Volta Basin Water Allocation System (VB-WAS, a decision support tool that allows assessing the impact of infrastructure development in the basin on the availability of current and future water resources, given the current or future climate conditions. The simulated historic and future discharge time series of the joint climate-hydrological modeling approach (MM5/WaSiM-ETH serve as input data for a river basin management model (MIKE BASIN. MIKE BASIN uses a network approach, and allows fast simulations of water allocation and of the consequences of different development scenarios on the available water resources. The impact of the expansion of small and medium scale reservoirs on the stored volume of Lake Volta has been quantified and assessed in comparison with the impact of climate variability on the water resources of the basin.

  16. Petroleum systems of Zhu III depression in Pearl River Mouth Basin, South China Sea

    Energy Technology Data Exchange (ETDEWEB)

    Weilin, Zhu; Li Mingbi; Wu Peikang (GNOOC, Hebei (China))

    1996-01-01

    Zhu III depression is located in the west part of Pearl River Mouth Basin, and covers an area of 11,000 sq km. Until now more than twenty wells have been drilled in the depression and its surrounding area, and all oil-gas fields and oil-gas discoveries are concentrated inside the depression. Integrated study indicates that there are two petroleum systems in Zhu III depression. One is Wenchang - Zhuhai, Zhujiang oil system which is mainly distributed in Wenchang B sag in the southwest part of the depression. Its source rock, the Wenchang formation is mainly composed of dark mudstone of lacustrine facies, with thicknesses up to more than 1000 m. Its reservoir includes tidal sandstone of transitional facies of Zhuhai formation and neritic sandstone of the lower part of Zhujiang formation. Through bounding faults and margin coarse sediment zone, oil generated from the Wenchang formation migrated into overlying sandstone of Zhuhai formation, which was overlaid by mudstone beds of bay facies of Zhuhai formation or neritic facies of Zhujiang formation, and formed oil accumulations. The other system is Enping - Zhuhai gas system, distributed in Wenchang A sag in the northeast part of the depression, whose source rock in the Enping formation deposited in the contracting stage of the lake, dominated by swamp coal measure in lithology and terrestrial plant clastics in kerogen components. The gas generated from Enping formation directly migrated into overlying tidal sandstone of Zhuhai formation and formed gas accumulations. Therefore, exploration in Wenchang A sag in the northeast part of the depression is for gas accumulations, and oil accumulations in Wenchang B sag in the southwest part of the depression, while oil-gas mixed accumulations are likely to be found in the transitional area of two systems.

  17. Petroleum systems of Zhu III depression in Pearl River Mouth Basin, South China Sea

    Energy Technology Data Exchange (ETDEWEB)

    Weilin, Zhu; Li Mingbi; Wu Peikang [GNOOC, Hebei (China)

    1996-12-31

    Zhu III depression is located in the west part of Pearl River Mouth Basin, and covers an area of 11,000 sq km. Until now more than twenty wells have been drilled in the depression and its surrounding area, and all oil-gas fields and oil-gas discoveries are concentrated inside the depression. Integrated study indicates that there are two petroleum systems in Zhu III depression. One is Wenchang - Zhuhai, Zhujiang oil system which is mainly distributed in Wenchang B sag in the southwest part of the depression. Its source rock, the Wenchang formation is mainly composed of dark mudstone of lacustrine facies, with thicknesses up to more than 1000 m. Its reservoir includes tidal sandstone of transitional facies of Zhuhai formation and neritic sandstone of the lower part of Zhujiang formation. Through bounding faults and margin coarse sediment zone, oil generated from the Wenchang formation migrated into overlying sandstone of Zhuhai formation, which was overlaid by mudstone beds of bay facies of Zhuhai formation or neritic facies of Zhujiang formation, and formed oil accumulations. The other system is Enping - Zhuhai gas system, distributed in Wenchang A sag in the northeast part of the depression, whose source rock in the Enping formation deposited in the contracting stage of the lake, dominated by swamp coal measure in lithology and terrestrial plant clastics in kerogen components. The gas generated from Enping formation directly migrated into overlying tidal sandstone of Zhuhai formation and formed gas accumulations. Therefore, exploration in Wenchang A sag in the northeast part of the depression is for gas accumulations, and oil accumulations in Wenchang B sag in the southwest part of the depression, while oil-gas mixed accumulations are likely to be found in the transitional area of two systems.

  18. Evaluation of a comprehensive tobacco control project targeting Arabic-speakers residing in south west Sydney, Australia.

    Science.gov (United States)

    Perusco, Andrew; Poder, Natasha; Mohsin, Mohammed; Rikard-Bell, Glenys; Rissel, Chris; Williams, Mandy; Hua, Myna; Millen, Elizabeth; Sabry, Marial; Guirguis, Sanaa

    2010-06-01

    Tobacco control is a health promotion priority, but there is limited evidence on the effectiveness of campaigns targeting culturally and linguistically diverse (CALD) populations. Being the largest population of non-English-speaking smokers residing in New South Wales (NSW), Australia, Arabic-speakers are a priority population for tobacco control. We report findings from baseline and post-intervention cross-sectional telephone surveys evaluating a comprehensive social marketing campaign (SMC) specifically targeting Arabic-speakers residing in south west Sydney, NSW. The project was associated with a decline in self-reported smoking prevalence from 26% at baseline to 20.7% at post (p < 0.05) and an increase in self-reported smoke-free households from 67.1% at baseline to 74.9% at post (p < 0.05). This paper contributes evidence that comprehensive SMCs targeting CALD populations can reduce smoking prevalence and influence smoking norms in CALD populations.

  19. Potential effects of energy development on environmental resources of the Williston Basin in Montana, North Dakota, and South Dakota

    Science.gov (United States)

    Post van der Burg, Max; Vining, Kevin C.; Frankforter, Jill D.

    2017-09-28

    The Williston Basin, which includes parts of Montana, North Dakota, and South Dakota in the United States, has been a leading domestic oil and gas producing area. To better understand the potential effects of energy development on environmental resources in the Williston Basin, the U.S. Geological Survey, in cooperation with the Bureau of Land Management, and in support of the needs identified by the Bakken Federal Executive Group (consisting of representatives from 13 Federal agencies and Tribal groups), began work to synthesize existing information on science topics to support management decisions related to energy development. This report is divided into four chapters (A–D). Chapter A provides an executive summary of the report and principal findings from chapters B–D. Chapter B provides a brief compilation of information regarding the history of energy development, physiography, climate, land use, demographics, and related studies in the Williston Basin. Chapter C synthesizes current information about water resources, identifies potential effects from energy development, and summarizes water resources research and information needs in the Williston Basin. Chapter D summarizes information about ecosystems, species of conservation concern, and potential effects to those species from energy development in the Williston Basin.

  20. Dosage comparison of Congo Basin and West African strains of monkeypox virus using a prairie dog animal model of systemic orthopoxvirus disease.

    Science.gov (United States)

    Hutson, Christina L; Carroll, Darin S; Self, Joshua; Weiss, Sonja; Hughes, Christine M; Braden, Zachary; Olson, Victoria A; Smith, Scott K; Karem, Kevin L; Regnery, Russell L; Damon, Inger K

    2010-06-20

    The prairie dog is valuable for the study of monkeypox virus (MPXV) virulence and closely resembles human systemic orthopoxvirus disease. Herein, we utilize a variable dose intranasal challenge with approximately 10(3), 10(4), 10(5), and 10(6)PFU for each clade to further characterize virulence differences between the two MPXV clades. A trend of increased morbidity and mortality as well as greater viral shedding was observed with increasing viral challenge dose. Additionally, there appeared to be a delay in onset of disease for animals challenged with lower dosages of virus. Mathematical calculations were used to determine LD(50) values and based on these calculations, Congo Basin MPXV had approximately a hundred times lower LD(50) value than the West African clade (5.9x10(3) and 1.29x10(5) respectively); reinforcing previous findings that Congo Basin MPXV is more virulent. Published by Elsevier Inc.

  1. Hydrochemical features of ground waters of the Pliocene deposits in the West Turkmen basin in relation to their oil and gas content

    Energy Technology Data Exchange (ETDEWEB)

    Arkhipov, A.S.

    1982-01-01

    Based on detailed analysis of dispersal in waters of certain trace elements and features of the chemical composition of waters in the Pliocene deposits of the West Turkmen basin, hydrochemical anomalies were established in the meridional course which apparently correspond to the hydrochemical zones. It has been established that the hydrochemically more mobile zone is the west Koturtepe-Miaserskiy. In the limits of this zone there was a more favorable situation for migration of hydrocarbons which is indicated by the confinement to this zone of those explored structures which are the most interesting from the viewpoint of oil and gas content. The little studied sections of this zone (Kyzylkum structural gulf) are of special interest for hydrocarbon formation prospecting.

  2. In search of a Silurian total petroleum system in the Appalachian basin of New York, Ohio, Pennsylvania, and West Virginia: Chapter G.11 in Coal and petroleum resources in the Appalachian basin: distribution, geologic framework, and geochemical character

    Science.gov (United States)

    Ryder, Robert T.; Swezey, Christopher S.; Trippi, Michael H.; Lentz, Erika E.; Avary, K. Lee; Harper, John A.; Kappel, William M.; Rea, Ronald G.; Ruppert, Leslie F.; Ryder, Robert T.

    2014-01-01

    Oil and gas fields in Silurian carbonate and sandstone reservoirs in the Appalachian basin probably originated from one or more of the following source rocks: (1) Upper Ordovician Utica Shale, (2) Middle to Upper Devonian black shale, and (3) Lower to Upper Silurian shale and carbonate units. In this reconnaissance study, selected Silurian shale and carbonate rocks in the subsurface of New York, Ohio, Pennsylvania, and West Virginia were analyzed for total organic carbon (TOC) content and Rock-Eval parameters to evaluate whether or not a Silurian total petroleum system exists in the Appalachian basin. A total of 308 samples were collected and analyzed for this investigation. Dark-gray to black shale and argillaceous carbonate intervals in the Salina Group (and equivalent units), Cabot Head Shale, Rochester Shale, Rose Hill Formation, Lockport Dolomite (or Group), and McKenzie Limestone (or Member) were prioritized for sampling and analysis.

  3. Muroto Project: Scientifi c Drilling of the Late Pliocene Forearc Basin Deposit on the West Coast of Muroto Peninsula, Shikoku, Japan

    Directory of Open Access Journals (Sweden)

    Kazuto Kodama

    2006-09-01

    Full Text Available The Muroto Peninsula on the Pacifi c margin of southwest Japan (Fig.1 formed as a result of tectonic events associated with oblique subduction along the Nankai Trough (Sugiyama, 1992, 1994. Late Pliocene forearc basin deposits of the Tonohama Group are exposed on the west coast of the peninsula. Until recently, stratigraphical and paleontological data have been collected only from rather scattered and poorly exposed outcrops (e.g., Yokoyama, 1926; Katto, et al.,1953; Kurihara, 1968; Nishida, 1979; Okumura and Takei, 1993, and no detailed chronological and sequence-stratigraphic framework has been established. The paleoenvironmental changes recorded in the formation thus remain poorly understood.

  4. Stable isotope characteristics of precipitation of Pamba River basin ...

    Indian Academy of Sciences (India)

    Isotope Hydrology Division, Centre for Water Resources Development and Management, .... 5.9% by fallow lands. 2.1 Climate. The Pamba River basin experiences ∼3000 mm of rainfall per year. The south-west and north- east monsoons have great influence over the cli- ..... precipitation per 100 m of elevation change.

  5. Staphylococcus aureus 'Down Under': contemporary epidemiology of S. aureus in Australia, New Zealand, and the South West Pacific.

    Science.gov (United States)

    Williamson, D A; Coombs, G W; Nimmo, G R

    2014-07-01

    The clinical and molecular epidemiology of Staphylococcus aureus disease has changed considerably over the past two decades, particularly with the emergence and spread of community-associated methicillin-resistant S. aureus (CA-MRSA) clones. Indeed, some of the first global descriptions of CA-MRSA were from remote indigenous communities in Western Australia, and from Pacific Peoples in New Zealand. The epidemiology of S. aureus infections in the South West Pacific has several unique features, largely because of the relative geographical isolation and unique indigenous communities residing in this region. In particular, a number of distinct CA-MRSA clones circulate in Australia and New Zealand, such as sequence type (ST) 93 methicillin-resistant S. aureus (MRSA) (Queensland clone) and clonal complex 75 S. aureus (Staphylococcus argenteus) in Australia, and ST30 MRSA (Southwest Pacific clone) in New Zealand. In addition, there is a disproportionate burden of S. aureus disease in indigenous paediatric populations, particularly in remote Aboriginal communities in Australia, and in Pacific Peoples and Maori in New Zealand. In this review, we provide a contemporary overview of the clinical and molecular epidemiology of S. aureus disease in the South West Pacific region, with a particular focus on features distinct to this region. © 2014 The Authors Clinical Microbiology and Infection © 2014 European Society of Clinical Microbiology and Infectious Diseases.

  6. Upper Plate Response to Varying Subduction Styles in the Forearc Cook Inlet Basin in South Central Alaska

    Science.gov (United States)

    Sanchez-Lohff, S. K.; Enkelmann, E.; Finzel, E.; Reid, M. M.

    2016-12-01

    The Cook Inlet forearc basin strata record the upper plate response to changes in subduction since 170 Ma. Subduction of normal oceanic crust during the Jurassic and Cretaceous was followed by spreading ridge subduction in the Paleocene, which initiated near trench magmatism and a shallow subduction angle. This was followed by a period of normal subduction until the Oligocene when subduction of an oceanic plateau commenced causing flat-slab subduction. We study the sedimentary record of the Cook Inlet Basin and analyze the sediment provenance, magmatic sources, paleotopography, and rock exhumation of southern Alaska, and their changes through time. We use a double dating technique on single detrital zircon grains from 25 samples combining fission track and U-Pb dating. We collected Jurassic to Pliocene sandstone, and modern fluvial deposits. Eight Mesozoic samples were taken from the eastern inverted section of the Cook Inlet Basin. Seven Cenozoic samples were taken from outcrops on the northern and southern margin of the basin, and four from northern offshore cores. Six modern river sands were sampled from four rivers to analyze what is currently draining into the basin from the north, east, and south. Zircon fission track data reveal that the Jurassic samples have been fully reset, while Cretaceous and Eocene samples have been partially reset. Subduction of the spreading ridge probably increased the geothermal gradient in the upper plate and caused thermal resetting of the underlying strata. Oligocene to Pliocene sediments contain the youngest age populations with lag times ranging 13-25 Myr. Samples from the northern margin (arc side) yield generally shorter lag times than samples from the south side (prism side). This pattern is consistent with modern sediments that show the youngest ages are sourced from the Alaska Range, revealed by a 14 Ma age peak in the Susitna River. In contrast, the youngest age populations found in the sediments of rivers draining the

  7. Rapid post-rift tectonic subsidence events in the Pearl River Mouth Basin, northern South China Sea margin

    Science.gov (United States)

    He, Min; Zhong, Guangfa; Liu, Xuefeng; Liu, Lihua; Shen, Xinping; Wu, Zhe; Huang, Ke

    2017-10-01

    Data from 26 drill wells and 27 regional seismic profiles were integrated to investigate the timing, phase and origin of the post-rift subsidence in the middle to eastern Pearl River Mouth Basin (PRMB) of the northern South China Sea using the traditional 1-D backstripping technique. Different from previous research of backstripped tectonic subsidence in the basin, we calculated the tectonic subsidence using the newly built local porosity-depth relationships for decompaction and updated sedimentological and paleontological data for paleobathymetry reconstruction. Well-data based subsidence curves reveal a roughly decaying pattern in both the magnitude and rate of the post-rift subsidence in the PRMB, which is in accordance with the general decreasing trend of the thermal subsidence typical of a passive margin. Two events of rapid post-rift tectonic subsidence were identified, which occurred in the Early to early Middle Miocene and the Pliocene. The timing of the first rapid post-rift subsidence event varies and is earlier in the southern rather than northern part of the basin. Additionally, the amplitude of contemporaneous tectonic subsidence is greater in the southern part of the basin. The second rapid tectonic subsidence event occurred simultaneously in both the southern and northern parts of the basin, with the amplitude of subsidence being much greater in the southern part. We associate the first rapid subsidence event with the southward jump of the South China Sea spreading ridge, which occurred between the Oligocene and Early Miocene, while the second event with the arc-continent collision at Taiwan since the latest Late Miocene. The southern PRMB in the deep-water slope area shows a much higher magnitude of tectonic subsidence in both events than its northern counterpart in the shelf area, which could be associated with its much thinner lithosphere. The latter could cause upswelling of denser lower crust and upper mantle material, resulting in more rapid

  8. The Permian Whitehill Formation (Karoo Basin, South Africa): deciphering the complexity and potential of an unconventional gas resource

    Science.gov (United States)

    Götz, Annette E.

    2014-05-01

    A key energy policy objective of the South African government is to diversify its energy mix from coal which constitutes 85% of the current mix. Gas will play a key role in the future South African economy with demand coming from electricity generation and gas-to-liquids projects. A study on world shale reserves conducted by the Energy Information Agency (EIA) in 2011 concluded that there could be as much as 485 Tcf recoverable reserves of shale gas in the South African Karoo Basin. However, the true extent and commercial viability is still unknown, due to the lack of exploration drilling and modern 3D seismic. The present study compiles existing data from literature review and new data from outcrop analogue studies on the Permian Whitehill Formation, the main target formation for future shale gas production, including thickness, depth, maturity, TOC, lithologies, sedimentary and organic facies, and dolerite occurrence to provide a first reference dataset for further investigations and resource estimates.

  9. Object-based 3D geomodel with multiple constraints for early Pliocene fan delta in the south of Lake Albert Basin, Uganda

    Science.gov (United States)

    Wei, Xu; Lei, Fang; Xinye, Zhang; Pengfei, Wang; Xiaoli, Yang; Xipu, Yang; Jun, Liu

    2017-01-01

    The early Pliocene fan delta complex developed in the south of Lake Albert Basin which is located at the northern end of the western branch in the East African Rift System. The stratigraphy of this succession is composed of distributary channels, overbank, mouthbar and lacustrine shales. Limited by the poor seismic quality and few wells, it is full of challenge to delineate the distribution area and patterns of reservoir sands. Sedimentary forward simulation and basin analogue were applied to analyze the spatial distribution of facies configuration and then a conceptual sedimentary model was constructed by combining with core, heavy mineral and palynology evidences. A 3D geological model of a 120 m thick stratigraphic succession was built using well logs and seismic surfaces based on the established sedimentary model. The facies modeling followed a hierarchical object-based approach conditioned to multiple trend constraints like channel intensity, channel azimuth and channel width. Lacustrine shales were modeled as background facies and then in turn eroded by distribute channels, overbank and mouthbar respectively. At the same time a body facies parameter was created to indicate the connectivity of the reservoir sands. The resultant 3D facies distributions showed that the distributary channels flowed from east bounding fault to west flank and overbank was adhered to the fringe of channels while mouthbar located at the end of channels. Furthermore, porosity and permeability were modeled using sequential Gaussian simulation (SGS) honoring core observations and petrophysical interpretation results. Despite the poor seismic is not supported to give enough information for fan delta sand distribution, creating a truly representative 3D geomodel is still able to be achieved. This paper highlights the integration of various data and comprehensive steps of building a consistent representative 3D geocellular fan delta model used for numeral simulation studies and field

  10. Cenomanian to Eocene Stratigraphy of the Jeanne d'Arc Basin Offshore Newfoundland, Canada, with Detailed Examination of Depositional Architecture of the South Mara Member

    Science.gov (United States)

    Karlzen, Kyle

    The South Mara Member in the Jeanne d'Arc Basin offshore Newfoundland, Canada forms significant sand deposits within the post-rift Early Eocene basin. This thesis present through examination of seismic and well data the Cenomanian to Eocene stratigraphy and depositional environments with a detailed examination of transport conduits and depositional architecture of the South Mara Member. South Mara submarine fan deposits are found in the northern basin and deltaic deposits are found in the southern basin. This study proposes north-eastward prograding deltas and mounded pro-delta turbidites were transported through the Cormorant Canyon system onto the peneplain surface on the uplifted Morgiana Anticlinorium. The Cormorant canyons cut into top seals of Lower Cretaceous reservoir units and pose a risk to hydrocarbon exploration of older strata; however, they create hydrocarbon migration pathways between Lower Cretaceous to Eocene reservoir zones.

  11. A detrital record of continent-continent collision in the Early-Middle Jurassic foreland sequence in the northern Yangtze foreland basin, South China

    Science.gov (United States)

    Qian, Tao; Liu, Shaofeng; Wang, Zongxiu; Li, Wangpeng; Chen, Xinlu

    2016-12-01

    The Mesozoic northern Yangtze foreland basin system was formed by continental collision between the North China and South China plates along the Mianlue suture. Synorogenic stratigraphic sequences of Late Triassic to Early-Middle Jurassic age were developed in the northern Yangtze foreland basin. The upper Middle Jurassic Shaximiao Formation consists mainly of thick-bedded terrestrial successions that serve as the main body of the basin-filling sequences, suggesting intense tectonism in the peripheral orogeny of the foreland basin. Laser-ICP-MS U-Pb analysis of 254 detrital zircon grains from sandstone samples and several published Lower-Middle Jurassic samples, detrital compositions, petrofacies, and paleocurrent reconstructions in the northern Yangtze foreland basin indicate that discrete source areas included the Qinling-Dabieshan ranges and the Mianlue suture zone to the north, and the South China plate to the south. The stratigraphic succession and sediment provenance of the foreland basin imply that the early Mianlue oceanic basin, magmatic arc, and nonmarine molasse foreland basin during the period of deposition were modified or buried by the subsequent continent-continent collision between the North China-Qinling-Dabieshan plate and the Yangtze plate during the Jurassic, which followed the oblique amalgamation between these plates during the Middle-Late Triassic.

  12. Evaluation of baseline ground-water conditions in the Mosteiros, Ribeira Paul, and Ribeira Fajã Basins, Republic of Cape Verde, West Africa, 2005-06

    Science.gov (United States)

    Heilweil, Victor M.; Earle, John D.; Cederberg, Jay R.; Messer, Mickey M.; Jorgensen, Brent E.; Verstraeten, Ingrid M.; Moura, Miguel A.; Querido, Arrigo; Spencer,; Osorio, Tatiana

    2006-01-01

    This report documents current (2005-06) baseline ground-water conditions in three basins within the West African Republic of Cape Verde (Mosteiros on Fogo, Ribeira Paul on Santo Antão, and Ribeira Fajã on São Nicolau) based on existing data and additional data collected during this study. Ground-water conditions (indicators) include ground-water levels, ground-water recharge altitude, ground-water discharge amounts, ground-water age (residence time), and ground-water quality. These indicators are needed to evaluate (1) long-term changes in ground-water resources or water quality caused by planned ground-water development associated with agricultural projects in these basins, and (2) the feasibility of artificial recharge as a mitigation strategy to offset the potentially declining water levels associated with increased ground-water development.Ground-water levels in all three basins vary from less than a few meters to more than 170 meters below land surface. Continuous recorder and electric tape measurements at three monitoring wells (one per basin) showed variations between August 2005 and June 2006 of as much as 1.8 meters. Few historical water-level data were available for the Mosteiros or Ribeira Paul Basins. Historical records from Ribeira Fajã indicate very large ground-water declines during the 1980s and early 1990s, associated with dewatering of the Galleria Fajã tunnel. More-recent data indicate that ground-water levels in Ribeira Fajã have reached a new equilibrium, remaining fairly constant since the late 1990s.Because of the scarcity of observation wells within each basin, water-level data were combined with other techniques to evaluate ground-water conditions. These techniques include the quantification of ground-water discharge (well withdrawals, spring discharge, seepage to springs, and gallery drainage), field water-quality measurements, and the use of environmental tracers to evaluate sources of aquifer recharge, flow paths, and ground

  13. A revision of communication strategies for effective disaster risk reduction: A case study of the South Durban basin, KwaZulu-Natal, South Africa

    Directory of Open Access Journals (Sweden)

    Chris Skinner

    2014-03-01

    Full Text Available The study examined how effective forms of communication are, or could be, impacting themore traditional forms of emergency and disaster management communication throughthe print and electronic media and how an integrated communication strategy involving allstakeholders could prove to be successful. This study was of an exploratory and descriptivenature, using a case study of the South Durban basin to demonstrate how media analysis,community discussions and internal and external evaluations of current practices in use bymajor industrial players in the basin has thus far failed to reach its full potential for effectivedisaster risk reduction. Strongly emerging from this study was the finding that, as a resultof these evaluations, new systems are now being planned to incorporate social media as anintegral part of an overall communication strategy, which could have far-reaching implicationsfor corporate communicators and strategic planners.

  14. Surface oceanography of BROKE-West, along the Antarctic margin of the south-west Indian Ocean ( 30-80∘E)

    Science.gov (United States)

    Williams, G. D.; Nicol, S.; Aoki, S.; Meijers, A. J. S.; Bindoff, N. L.; Iijima, Y.; Marsland, S. J.; Klocker, A.

    2010-05-01

    Hydrographic CTD and ADCP data were collected during the BROKE-West research voyage (January-March 2006) in the south-west Indian Ocean sector of the Antarctic margin. These data describe the large-scale circulation, water masses, fronts and summertime stratification in the surface layer over the continental shelf, slope and rise region between 30 and 80∘E that forms CCAMLR Statistical Area 58.4.2. The surface circulation matched the full-depth circulation and consisted of the eastward flowing southern Antarctic Circumpolar Current front to the north, and the westward flowing Antarctic Slope Current associated with the Antarctic Slope Front along the continental slope to the south. Two sub-polar gyres were detected south of the Southern Boundary of the Antarctic Circumpolar Current: the eastern Weddell Gyre in the Cosmonaut Sea ( 30-50∘E) and the greater Prydz Bay Gyre in the Cooperation Sea ( 60-80∘E). In the eastern Weddell Gyre, the seasonal mixed layer depths were shallower, warmer and fresher relative to the regions to the east which were deeper, cooler and more saline. This spatial variability is found to be strongly correlated to the large-scale pattern of sea ice melt/retreat in the months preceding the voyage and the accumulated wind stress thereafter. Areas of upwelling warm deep waters into the surface layer are presented from positive anomalies of potential temperature and nutrient concentrations (nitrate and silicate). These anomalies were strongest in the eastern Weddell Gyre in the vicinity of the Cosmonaut Polynya/Embayment, north of Cape Anne and near the Southern Boundary of the Antarctic Circumpolar Current in the eastern sector of the survey. The summertime stratification (seasonal mixed layer, seasonal pycnocline and Tmin layer) are discussed relative to the distributions of chl a and acoustically determined Antarctic Krill ( Euphausia superba) densities. Elevated chl a concentrations were found in the surface layer of the marginal ice

  15. Variability of mineral dust deposition in the western Mediterranean basin and south-east of France

    Science.gov (United States)

    Vincent, Julie; Laurent, Benoit; Losno, Rémi; Bon Nguyen, Elisabeth; Roullet, Pierre; Sauvage, Stéphane; Chevaillier, Servanne; Coddeville, Patrice; Ouboulmane, Noura; di Sarra, Alcide Giorgio; Tovar-Sánchez, Antonio; Sferlazzo, Damiano; Massanet, Ana; Triquet, Sylvain; Morales Baquero, Rafael; Fornier, Michel; Coursier, Cyril; Desboeufs, Karine; Dulac, François; Bergametti, Gilles

    2016-07-01

    Previous studies have provided some insight into the Saharan dust deposition at a few specific locations from observations over long time periods or intensive field campaigns. However, no assessment of the dust deposition temporal variability in connection with its regional spatial distribution has been achieved so far from network observations over more than 1 year. To investigate dust deposition dynamics at the regional scale, five automatic deposition collectors named CARAGA (Collecteur Automatique de Retombées Atmosphériques insolubles à Grande Autonomie in French) have been deployed in the western Mediterranean region during 1 to 3 years depending on the station. The sites include, from south to north, Lampedusa, Majorca, Corsica, Frioul and Le Casset (southern French Alps). Deposition measurements are performed on a common weekly period at the five sites. The mean dust deposition fluxes are higher close to the northern African coasts and decrease following a south-north gradient, with values from 7.4 g m-2 year-1 in Lampedusa (35°31' N, 12°37' E) to 1 g m-2 year-1 in Le Casset (44°59' N, 6°28' E). The maximum deposition flux recorded is of 3.2 g m-2 wk-1 in Majorca with only two other events showing more than 1 g m-2 wk-1 in Lampedusa, and a maximum of 0.5 g m-2 wk-1 in Corsica. The maximum value of 2.1 g m-2 year-1 observed in Corsica in 2013 is much lower than existing records in the area over the 3 previous decades (11-14 g m-2 year-1). From the 537 available samples, 98 major Saharan dust deposition events have been identified in the records between 2011 and 2013. Complementary observations provided by both satellite and air mass trajectories are used to identify the dust provenance areas and the transport pathways from the Sahara to the stations for the studied period. Despite the large size of African dust plumes detected by satellites, more than 80 % of the major dust deposition events are recorded at only one station, suggesting that the dust

  16. Intelligence Preparations for World War I in South West Africa James

    African Journals Online (AJOL)

    officers understood the immense value of military intelligence. Prior to World War I, South Africa's Union. Defence Force had no organic intelligence service, which is surprising given the success of the Zuid-. Afrikaansche Republiek Geheime Dienst (South African Republic Secret Service). 14 A comparable capability would ...

  17. Summer variability of Saharan dust transport events in mountain areas north and south of Po basin

    Science.gov (United States)

    Landi, Tony C.; Marinoni, Angela; Cristofanelli, Paolo; Putero, Davide; Duchi, Rocco; Alborghetti, Marcello; Bonafè, Ubaldo; Calzolari, Francescopiero; Pietro Verza, Gian; Bonasoni, Paolo

    2013-04-01

    Mineral dust intrusions from northern African desert regions have a strong impact on the Mediterranean areas and Italian peninsula as they can cause an anomalous increase of aerosol concentrations in the tropospheric column and often an increase of particulate matter at ground level. The estimate of Saharan dust contribution to aerosols concentrations is therefore a key issue in air quality assessment and policy formulation, since can cause air quality exceedances of the PM10 daily limits (50 μg m-3) set by the European Union (EU/2008/50). This study presents a first identification and characterization of Saharan dust outbreaks observed during summer season at two high mountain stations located both South (Mt. Cimone, 2165 m asl) and North (Rifugio Guasti, Stelvio National Park, 3285 m asl) of Po valley. An estimation of their impact on PM10 concentrations in both sites, and in urban and rural areas of the Po basin is provided. Joining specific measurements (ground and satellite based) and numerical modeling, an investigation into the vertical structure of dust load will be presented. Actually, methodologies conceived for distinguishing dust outbreaks transported above the boundary layer without any impact at the ground level from those causing deposition are currently still lacking. Basically, the approach proposed in this work includes a deep analysis of in-situ measurements starting from long-term observation of Saharan dust carried out at the Mt. Cimone and more recent measurements performed in the framework of SHARE Stelvio Project, as well as the usage of ad hoc model chain (meteorological processor, chemical transport model, and aerosols optical properties calculation) to describe emission, transport and deposition dynamics of mineral dust that - in summertime - often affect the North Italy.

  18. Organic Geochemical Characteristic Of Crude Oils From Orange Graben, South Sumatra Basin

    Directory of Open Access Journals (Sweden)

    Muhammad Syaifuddin

    2016-12-01

    Full Text Available Lemat Formation in the Orange Graben in the South Sumatra basin has been considered as syn-rift sediments consist of fluvio-lacustrine sediments, create source rock with fluvio-lacustrine characterize. Based on existing publications, showing that the oils from Orange Graben have fluvio-deltaic characterization and generated by source rock from Talangakar Formation with fluvio-deltaic depositional environment. This paper emphasizes geochemistry methods. Source rock analysis, consist of 26 samples for carbon isotope and 14 samples for biomarker, while oil analysis, consist of 15 samples for carbon isotope and 19 samples for biomarker. Characterization has been based on qualitative and quantitative data. Qualitative data comprise evaluation based on chromatograms and mass-fragmentograms, whereas quantitative data consists of a series of cross-plots, eg. cross plot of carbon isotope δ13C saturates - aromatics, distribution of C27-C28-C29 sterane, Pr/nC17-Ph/nC18, Pr/Ph-Pr/nC17, carbon isotope δ13C saturates-Pr/Ph, Pr/Ph-total hopane/total sterane, and ratio of C26/C25 (tricyclic. Based on geochemical result of analysis, source rocks of Lemat Formation in the Orange Graben interpret as source rock with fluvio-deltaic characterize, have terrestrial influence while Talangakar Formation in the Orange Graben interpreted as source rock with deltaic characterization, having marine and terrestrial influence. Both of them , consist of humic kerogen. Whereas, oil samples in the Orange Graben interpreted as oilwhich is generated by source rock with fluvio-deltaic characterization, having terrestrial influence, in anoxic-suboxic-oxic conditions, consisting of humic kerogen. Correlation result between source rocks and oils in the Orange Graben, indicating that fluvio-deltaic oil type in the Orange Graben are correlate with not only the source rocks of Talangakar Formations but also with source rock of Lemat Formation.

  19. Groundwater potential zoning of a peri-urban wetland of south Bengal Basin, India.

    Science.gov (United States)

    Sahu, Paulami; Sikdar, Pradip K

    2011-03-01

    Demand for groundwater for drinking, agricultural, and industrial purposes has increased due to rapid increase in population. Therefore, it is imperative to assess the groundwater potential of different areas, especially in a fragile wetland ecosystem to select appropriate sites for developing well fields to minimize adverse environmental impacts of groundwater development. This study considers East Calcutta Wetlands (ECW)--a freshwater peri-urban inland wetland ecosystem located at the lower part of the deltaic alluvial plain of South Bengal Basin and east of Kolkata city. This wetland is well known over the world for its resource recovery systems developed by local people through ages, using wastewater of the city. The subsurface geology is completely blanketed by the Quaternary sediments comprising a succession of silty clay, sand of various grades, and sand mixed with occasional gravels and thin intercalations of silty clay. Groundwater occurs mostly under confined condition except in those places where the top aquitard has been obliterated due to scouring action of past channels. The groundwater in the study area is being over-extracted at the rate of 65 × 10(3) m(3)/day. Overlay analysis in Geographic Information System platform using multiple criteria such as water quality index, hydraulic conductivity, groundwater velocity, and depth to piezometric surface reveals that in and around ECW, there are five groundwater potential zones. About 74% of the aquifer of this area shows very poor to medium groundwater potential. Management options such as minimization of groundwater abstraction by introducing the treated surface water supply system and the implementation of rainwater harvesting and artificial recharge in high-rise buildings and industries are suggested for different potential zones.

  20. Flood events in small mountain catchments : observations and results from the Draix experimental basins (French South Alps)

    Science.gov (United States)

    Mathys, N.; Klotz, S.

    2009-04-01

    The floods generated in small mountains basin are flash floods often devastating. Predicting runoff, erosion and sediment yield within mountainous catchments presents a strategic interest due to the consequences which arise from these phenomenons and the need for natural hazard mitigation engineering. The need to quantify the phenomenon and the effect of the restoration strategies led the Cemagref to monitor a group of little basins in the Southern French Alps : the Draix field Observatory on hydrological and erosional processes in mountain areas. The main goal of this laboratory is to improve the prediction of the runoff and erosion response of small mountain catchments to climatological inputs (precipitation and temperature), particularly for extreme events. A focus is given on the spatial and temporal variability of rainfall at the scale of a small mountainous catchment, on the hydrological response of these small catchments to this input, on the role of the vegetation cover in these processes. The experimental basins of Draix are located 200 km South of Grenoble, near the little town of Digne. Five basins have been equipped since 1982 for the measurement of rainfall, liquid discharge and solid transport, which can be both bedload and suspension. These basins have different areas, from 1300 m² to 1 km². Four are located in denuded areas with vegetation cover ranging from 21 % to 56 %; the last one was reforested at the end of the last century, within the frame of restoration works. 87 % of its surface area is now covered with a pine forest. The paper will present a summary on the conditions of occurrence of the high floods for the different basin scale. As two catchments of nearly 1 km², have homogeneous but different vegetation covers, a comparison can be made and highlights the effect of the vegetation cover on the flood generation.

  1. East-West, Collectivist-Individualist: A Cross-Cultural Examination of Temperament in Toddlers from Chile, Poland, South Korea, and the U.S

    Science.gov (United States)

    Krassner, Ariye M.; Gartstein, Maria A.; Park, Curie; Dragan, Wojciech Ł.; Lecannelier, Felipe; Putnam, Samuel P.

    2017-01-01

    The present study examined toddler temperament across Chilean, South Korean, Polish, and US samples, providing an opportunity to examine both collectivist-individualist and East-West contrasts. The effect of culture on the three factor and 18 dimension scores provided by the Early Childhood Behavior Questionnaire were investigated. Results provide evidence of cross-cultural differences between the four samples. Chilean toddlers scored significantly higher than US, Polish, and South Korean children on the overall factor of Negative Affectivity, as well as higher than the Polish and South Korean samples on the Surgency factor. South Korean toddlers scored significantly higher on the factor of Effortful Control, and two related dimensions, than US, Polish, or Chilean samples. Results are discussed in terms of the apparent roles of individualism/collectivism and East-West distinctions in shaping temperament development. PMID:29333175

  2. A mixed methods assessment of barriers to maternal, newborn and child health in gogrial west, south Sudan.

    Science.gov (United States)

    Lawry, Lynn; Canteli, Covadonga; Rabenzanahary, Tahina; Pramana, Wartini

    2017-01-19

    Health conditions for mothers, newborns, and children in South Sudan are among the worst worldwide. South Sudan has the highest rate of maternal mortality in the world and despite alarming statistics, few women and children in South Sudan have access to needed healthcare, especially in rural areas. The purpose of this study was to understand the barriers to maternal, newborn and child health in Gogrial West, Warrap State, South Sudan, one of the most underdeveloped states. A randomized household quantitative study and supplemental qualitative interviews were employed in 8/9 payams in Gogrial West, Warrap, South Sudan. Interviews were conducted with randomly selected female household members (n = 860) who were pregnant or had children less than 5 years of age, and men (n = 144) with a wife having these characteristics. Non-randomized qualitative interviews (n = 72) were used to nuance and add important socio-cultural context to the quantitative data. Analysis involved the estimation of weighted population means and percentages, using 95% confidence intervals and considering p-values as significant when less than 0.05, when comparisons by age, age of marriage, wife status and wealth were to be established. Most women (90.8%) and men (96.6%) did not want contraception. Only 1.2% of women aged 15-49 had met their need for family planning. On average, pregnant women presented for antenatal care (ANC) 2.3 times and by unskilled providers. Less than half of households had a mosquito net; fewer had insecticide treated nets. Recognition of maternal, newborn and child health danger signs overall was low. Only 4.6% of women had skilled birth attendants. One quarter of children had verifiable DPT3 immunization. Five percent of men and 6% of women reported forced intercourse. Overall men and women accept beatings as a norm. Barriers to care for mothers, infants and children are far more than the lack of antenatal care. Maternal, newborn and child health suffers

  3. Neoarchaean tectonic history of the Witwatersrand Basin and Ventersdorp Supergroup: New constraints from high-resolution 3D seismic reflection data

    CSIR Research Space (South Africa)

    Manzi, MSD

    2013-04-01

    Full Text Available First-order scale structures in the West Wits Line and West Rand goldfields of the Witwatersrand Basin (South Africa) were mapped using the high-resolution 3D reflection seismic method. Structural models constrain the magnitude of displacement...

  4. Climate, environmental change and taphonomic processes in the Pliocene and Early Pleistocene of the South-West Caspian Sea

    Science.gov (United States)

    Hoyle, T. M. V.; Leroy, S.; Lopez-Merino, L.

    2016-12-01

    The Caspian Sea is the largest endorheic lake in the world and is highly sensitive to climate change. During the Pliocene, a thick series of sediments was deposited in the South Caspian Basin that now contains important oil and gas reserves. A reliable, well-dated climate and palaeoenvironment proxy record was created for the Pliocene and Early Pleistocene of the South Caspian Basin in Azerbaijan. We assessed climate cyclicity at the Milankovitch level to test whether a link could be demonstrated between climate and sedimentation patterns in Azerbaijan's primary hydrocarbon producing formations (Productive Series) as well as in the top seal (Akchagyl Formation). Magnetostratigraphy and radiometric dating (40Ar/39Ar on volcanic ashes) of the quasi-marine Akchagyl Formation assigned this section to the Late Pliocene-Early Pleistocene. Palaeoenvironments were reconstructed using palynology (pollen and dinocysts) and supported by particle size analysis and XRF/stable isotopes. Pollen is used to interpret terrestrial vegetation successions (as a proxy for catchment climate) and dinocysts for conditions within the water body itself (linked to degree of fresh water input, base level variation and inter-basin connectivity). The Akchagyl pollen record shows cyclic vegetation patterns related to obliquity-scale climate forcing. Dinocysts and geochemical proxies also respond to climatic influence, but their behaviour is more strongly influenced by connectivity between the Caspian Sea and adjacent basins. New methods were explored to constrain problems of reworking in deltaic facies deposited during the Pliocene. In particular, quality of the environmental signal was assessed using fluorescence microscopy, as delta assemblages can be dominated by older reworked palynomorphs, obscuring the contemporary environmental signal. Serious issues relating to depositional environments and taphonomy within the Productive Series were highlighted. This must be understood before the local

  5. Variability in warm-season atmospheric circulation and precipitation patterns over subtropical South America: relationships between the South Atlantic convergence zone and large-scale organized convection over the La Plata basin

    Science.gov (United States)

    Mattingly, Kyle S.; Mote, Thomas L.

    2017-01-01

    Warm-season precipitation variability over subtropical South America is characterized by an inverse relationship between the South Atlantic convergence zone (SACZ) and precipitation over the central and western La Plata basin of southeastern South America. This study extends the analysis of this "South American Seesaw" precipitation dipole to relationships between the SACZ and large, long-lived mesoscale convective systems (LLCSs) over the La Plata basin. By classifying SACZ events into distinct continental and oceanic categories and building a logistic regression model that relates LLCS activity across the region to continental and oceanic SACZ precipitation, a detailed account of spatial variability in the out-of-phase coupling between the SACZ and large-scale organized convection over the La Plata basin is provided. Enhanced precipitation in the continental SACZ is found to result in increased LLCS activity over northern, northeastern, and western sections of the La Plata basin, in association with poleward atmospheric moisture flux from the Amazon basin toward these regions, and a decrease in the probability of LLCS occurrence over the southeastern La Plata basin. Increased oceanic SACZ precipitation, however, was strongly related to reduced atmospheric moisture and decreased probability of LLCS occurrence over nearly the entire La Plata basin. These results suggest that continental SACZ activity and large-scale organized convection over the northern and eastern sections of the La Plata basin are closely tied to atmospheric moisture transport from the Amazon basin, while the warm coastal Brazil Current may also play an important role as an evaporative moisture source for LLCSs over the central and western La Plata basin.

  6. Modelling the effects of climate and land cover change on groundwater recharge in south-west Western Australia

    Directory of Open Access Journals (Sweden)

    W. Dawes

    2012-08-01

    Full Text Available The groundwater resource contained within the sandy aquifers of the Swan Coastal Plain, south-west Western Australia, provides approximately 60 percent of the drinking water for the metropolitan population of Perth. Rainfall decline over the past three decades coupled with increasing water demand from a growing population has resulted in falling dam storage and groundwater levels. Projected future changes in climate across south-west Western Australia consistently show a decline in annual rainfall of between 5 and 15 percent. There is expected to be a reduction of diffuse recharge across the Swan Coastal Plain. This study aims to quantify the change in groundwater recharge in response to a range of future climate and land cover patterns across south-west Western Australia.

    Modelling the impact on the groundwater resource of potential climate change was achieved with a dynamically linked unsaturated/saturated groundwater model. A vertical flux manager was used in the unsaturated zone to estimate groundwater recharge using a variety of simple and complex models based on climate, land cover type (e.g. native trees, plantation, cropping, urban, wetland, soil type, and taking into account the groundwater depth.

    In the area centred on the city of Perth, Western Australia, the patterns of recharge change and groundwater level change are not consistent spatially, or consistently downward. In areas with land-use change, recharge rates have increased. Where rainfall has declined sufficiently, recharge rates are decreasing, and where compensating factors combine, there is little change to recharge. In the southwestern part of the study area, the patterns of groundwater recharge are dictated primarily by soil, geology and land cover. In the sand-dominated areas, there is little response to future climate change, because groundwater levels are shallow and much rainfall is rejected recharge. Where the combination of native vegetation and

  7. Conflict between transitional consequences and proclaimed European values and main reason of continual destabilization of south-west Balkan

    Directory of Open Access Journals (Sweden)

    Šuvaković Uroš V.

    2013-01-01

    Full Text Available In this paper, we tried to analyze the consequences of the transitional process in the societies of the South-West Balkan, primarily on the example of Serbia. The indicators that we have found by the research clearly speak in favor of the fact that the transition is the cause of peripheralization of these societies. Citizens who entered the transitional processes with hope - imagining them as the accomplishment of the best European values - soon were convinced that the transition is only another manner to place these countries in the position to be exploited by multinational capital and developed, 'old' member of the EU, as well as to serve for squaring accounts in geopolitical games of the creators of the 'new world order'. In the case of the countries of the Western Balkan, the transition had the characteristic that, among other things, it was performed in conditions of political violence: destruction of the joint state of Yugoslavia, civil and religious war in Croatia and Bosnia and Herzegovina, aggression of NATO to the Federal Republic of Yugoslavia, destabilization of Serbia through the attempt of Kosovo secession, etc., therefore, in the conditions that were extremely antihistorical. While the Europe was uniting, the Balkan was disintegrating. At least two out of the three 'ideas that conquered the world' (Mandelbaum have been violated: the peace and the democracy. Free market in the conditions when there was no peace and regarding democratically insufficiently consolidated societies could not bring their progress, but on the contrary, as we established, only regression. That is the reason why the destroyed and collided South-Balkan societies, contrary to the European vow of their political elites, are today de facto much further from the European aspirations than they were quarter of the century ago. With their policy, the countries of the West have contributed to De- Europeanization of the South-West Balkan and strengthening of the

  8. Modelling the effects of climate and land cover change on groundwater recharge in south-west Western Australia

    Science.gov (United States)

    Dawes, W.; Ali, R.; Varma, S.; Emelyanova, I.; Hodgson, G.; McFarlane, D.

    2012-08-01

    The groundwater resource contained within the sandy aquifers of the Swan Coastal Plain, south-west Western Australia, provides approximately 60 percent of the drinking water for the metropolitan population of Perth. Rainfall decline over the past three decades coupled with increasing water demand from a growing population has resulted in falling dam storage and groundwater levels. Projected future changes in climate across south-west Western Australia consistently show a decline in annual rainfall of between 5 and 15 percent. There is expected to be a reduction of diffuse recharge across the Swan Coastal Plain. This study aims to quantify the change in groundwater recharge in response to a range of future climate and land cover patterns across south-west Western Australia. Modelling the impact on the groundwater resource of potential climate change was achieved with a dynamically linked unsaturated/saturated groundwater model. A vertical flux manager was used in the unsaturated zone to estimate groundwater recharge using a variety of simple and complex models based on climate, land cover type (e.g. native trees, plantation, cropping, urban, wetland), soil type, and taking into account the groundwater depth. In the area centred on the city of Perth, Western Australia, the patterns of recharge change and groundwater level change are not consistent spatially, or consistently downward. In areas with land-use change, recharge rates have increased. Where rainfall has declined sufficiently, recharge rates are decreasing, and where compensating factors combine, there is little change to recharge. In the southwestern part of the study area, the patterns of groundwater recharge are dictated primarily by soil, geology and land cover. In the sand-dominated areas, there is little response to future climate change, because groundwater levels are shallow and much rainfall is rejected recharge. Where the combination of native vegetation and clayey surface soils restricts possible

  9. November 2007 Multibeam Mapping of South West corner of Pulley Ridge

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — This disk or set of disks contain high-resolution multibeam and backscatter maps of the south-western corner of the Pulley Ridge Area, near the Tortugas, in the Gulf...

  10. Decreasing Past and Mid-Century Rainfall Indices over the Ouémé River Basin, Benin (West Africa)

    National Research Council Canada - National Science Library

    Yekambessoun N’Tcha M’Po; Emmanuel Agnide Lawin; Benjamin Kouassi Yao; Ganiyu Titilope Oyerinde; Andre Attogouinon; Abel Akambi Afouda

    2017-01-01

    This study analyzed the trends of extreme daily rainfall indices over the Ouémé basin using the observed data from 1950 to 2014 and the projected rainfall of regional climate model REMO (REgional MOdel...

  11. Assessing Hydrologic Impacts of Future Land Cover Change Scenarios in the South Platte River Basin (CO, WY, & NE) and the San Pedro River Basin (U.S./Mexico).

    Science.gov (United States)

    Barlow, J. E.; Burns, I. S.; Guertin, D. P.; Kepner, W. G.; Goodrich, D. C.

    2016-12-01

    Long-term land-use and land cover change and their associated impacts pose critical challenges to sustaining vital hydrological ecosystem services for future generations. In this study, a methodology to characterize hydrologic impacts from future urban growth through time that was developed and applied on the San Pedro River Basin was expanded and utilized on the South Platte River Basin as well. Future urban growth is represented by housing density maps generated in decadal intervals from 2010 to 2100, produced by the U.S. Environmental Protection Agency (EPA) Integrated Climate and Land-Use Scenarios (ICLUS) project. ICLUS developed future housing density maps by adapting the Intergovernmental Panel on Climate Change (IPCC) Special Report on Emissions Scenarios (SRES) social, economic, and demographic storylines to the conterminous United States. To characterize hydrologic impacts from future growth, the housing density maps were reclassified to National Land Cover Database (NLCD) 2006 land cover classes and used to parameterize the Soil and Water Assessment Tool (SWAT) using the Automated Geospatial Watershed Assessment (AGWA) tool. The objectives of this project were to 1) develop and implement a methodology for adapting the ICLUS data for use in AGWA as an approach to evaluate impacts of development on water-quantity and -quality, 2) present, evaluate, and compare results from scenarios for watersheds in two different geographic and climatic regions, 3) determine watershed specific implications of this type of future land cover change analysis.

  12. Modeling anomalous surface - wave propagation across the Southern Caspian basin

    Energy Technology Data Exchange (ETDEWEB)

    Priestly, K.F.; Patton, H.J.; Schultz, C.A.

    1998-01-09

    The crust of the south Caspian basin consists of 15-25 km of low velocity, highly attenuating sediment overlying high velocity crystalline crust. The Moho depth beneath the basin is about 30 km as compared to about 50 km in the surrounding region. Preliminary modeling of the phase velocity curves shows that this thick sediments of the south Caspian basin are also under-lain by a 30-35 km thick crystalline crust and not by typical oceanic crust. This analysis also suggest that if the effect of the over-pressuring of the sediments is to reduce Poissons` ratio, the over-pressured sediments observed to approximately 5 km do not persist to great depths. It has been shown since 1960`s that the south Caspian basin blocks the regional phase Lg. Intermediate frequency (0.02-0.04 Hz) fundamental mode Raleigh waves propagating across the basin are also severely attenuated, but the low frequency surface waves are largely unaffected. This attenuation is observed along the both east-to-west and west-to-east great circle paths across the basin, and therefore it cannot be related to a seismograph site effect. We have modeled the response of surface waves in an idealized rendition of the south Caspian basin model using a hybrid normal mode / 2-D finite difference approach. To gain insight into the features of the basin which cause the anomalous surface wave propagation, we have varied parameters of the basin model and computed synthetic record sections to compare with the observed seismograms. We varied the amount of mantel up-warp, the shape of the boundaries, the thickness and shear wave Q of the sediments and mantle, and the depth of the water layer. Of these parameters, the intermediate frequency surface waves are most severely affected by the sediments thickness and shear wave attenuation. fundamental mode Raleigh wave phase velocities measure for paths crossing the basin are extremely low.

  13. Stable isotope distribution in continental Maastrichtian vertebrates from the Haţeg Basin, South Carpathians

    Science.gov (United States)

    Bojar, Ana-Voica; Csiki, Zoltan; Grigorescu, Dan

    2010-05-01

    The oxygen isotopic compositions of biogenic apatite from crocodiles, turtles and dinosaurs, and their relationship to climate and physiology have been evidenced by several studies (Barrick and Showers, 1995; Kolodny et al., 1996; Barrick et al., 1999; Fricke and Rogers, 2000; Stoskopf et al., 2001; Straight et al., 2004; Amiot et al., 2007). To date, few attempts have been made to correlate the enamel d13C to dietary resources of dinosaurs (Bocherens et al., 1988; Stanton Thomas and Carlson, 2004; Fricke and Pearson, 2008; Fricke, et al., 2008). One additional complication is that for dinosaurs, the d18O of enamel phosphate depends on both body water and variations in body temperature. Several studies addressed the issue of endothermy vs. ectothermy of fossil vertebrates by studying inter- and intra-bone and enamel isotopic variability (Barrick and Showers, 1994, 1995; Barrick et al., 1996; 1998; Fricke and Rogers, 2000). More recent investigations provided evidence for inter-tooth temporal variations and related them to seasonality and/or changes in physiology (Straight et al., 2004; Stanton Thomas and Carlson, 2004). The main objectives of this study are to extract palaeoclimatic information considering, beside lithofacial characteristics and the isotopic distribution of carbonates formed in paleosols, the stable isotope composition of vertebrate remains from the Haţeg Basin. We also sampled several teeth along their growth axis in order to get further information about growth rates and the amplitude of isotopic variation. Located in the South Carpathians in Romania, the Haţeg Basin contains a thick sequence of Maastrichtian continental deposits yielding a rich dinosaur and mammalian fauna. Stable isotope analyses of both calcretes and dinosaur, crocodilian and turtle remains from two localities (Tuştea and Sibişel) were integrated in order to reconstruct environmental conditions during the Maastrichtian time and to gain further insights into the metabolism

  14. The intertidal fish fauna of the west coast of South Africa - species ...

    African Journals Online (AJOL)

    1991-11-05

    Nov 5, 1991 ... the intertidal ichthyofauna of the Cape west coast, with a view to elucidating patterns of habitat subdivision at species, community and biogeographical levels. Methods. Intertidal fIsh were collected from 30 rock pools at Groen- rivier (300 51'S/1r33'E) and 32 pools at Cape St Martin. (32°40'S/17°56'E) during ...

  15. Clinical audit of knowledge and practice of epidural labour analgesia amongst obstetricians in south-west Nigeria.

    Science.gov (United States)

    Osinaike, B B; Ogunbode, O O; Aderinto, D A

    2010-06-01

    Epidural analgesia (EA) is the most ideal method for pain relief during labour. We sought to highlight the current knowledge and practice of the obstetricians regarding epidural labour analgesia (ELA). An audit was conducted amongst obstetricians in two teaching hospitals in the south west of Nigeria. Most of our respondents received lectures about ELA but about half of them rated the lectures as inadequate. Though 37.8% and 53.3% of respondents are of the opinion that there is interference with labour and increased incidence of instrumentation following epidural analgesia in labour respectively, however 84.4% agreed that the technique is not associated with adverse neonatal or maternal outcome and 97.8% will prefer their patients having epidural labour analgesia. We are of the opinion that education regarding ELA, both during and after obstetric speciality training, be improved, and well-established interpersonal relationship between obstetricians and anaesthetists will be needed to achieve this.

  16. The consequences of land use change on nutrient exports: a regional scale assessment in south-west Victoria, Australia.

    Science.gov (United States)

    Ierodiaconou, Daniel; Laurenson, Laurie; Leblanc, Marc; Stagnitti, Frank; Duff, Gordon; Salzman, Scott; Versace, Vincent

    2005-03-01

    Estimation of nutrient load production based on multi-temporal remotely sensed land use data for the Glenelg-Hopkins region in south-west Victoria, Australia, is discussed. Changes in land use were mapped using archived Landsat data and computerised classification techniques. Land use change has been rapid in recent history with 16% of the region transformed in the last 22 years. Total nitrogen and phosphorus loads were estimated using an export coefficient model. The analysis demonstrates an increase in modelled nitrogen and phosphorus loadings from 1980 to 2002. Whilst such increases were suspected from past anecdotal and ad-hoc evidence, our modelling estimated the magnitude of such increases and thus demonstrated the enormous potential of using remote sensing and GIS for monitoring regional scale environmental processes.

  17. Three-dimensional architecture and development of Danianbryozoan mounds at Limhamn, south-west Sweden, usingground-penetrating radar

    DEFF Research Database (Denmark)

    Nielsen, Lars; Schack von Brockdorff, A.; Bjerager, Morten Gustav Erik

    2009-01-01

    in the Limhamn limestone quarry, south-west Sweden, obtained from combined reflected ground-penetrating radar signals and outcrop analysis provide new information about the architecture and growth development of such mounds. The mounds are composed of bryozoan limestone and dark-grey to black flint bands which...... outline mound geometries. Ground-penetrating radar data sections are collected over a 120 m by 60 m grid of data lines with trace spacing of 0·25 m, providing a depth penetration of 7 to 12 m and a vertical resolution of ca 0·30 m. The ground-penetrating radar images outline the geometry of the internal...

  18. Sr-Nd-Hf-Pb isotope geochemistry of basaltic rocks from the Cretaceous Gyeongsang Basin, South Korea: Implications for basin formation

    Science.gov (United States)

    Choi, S.; Kwon, S.; Lee, D.

    2013-12-01

    To better understand the formative mechanism of the Cretaceous Gyeongsang Basin in South Korea, we determined the geochemical compositions of Early Cretaceous syntectonic basaltic rocks intercalated with basin sedimentary assemblages. Two distinct compositional groups appeared: tholeiitic to calc-alkaline basalts from the Yeongyang sub-basin and high-K to shoshonitic basaltic trachyandesites from the Jinju and Uiseong sub-basins. All collected samples exhibit patterns of light rare earth element enrichment and chondrite-normalized (La/Yb)N ratios ranging from 2.4 to 23.6. In a primitive-mantle-normalized spidergram, the samples show distinctive negative anomalies in Nb, Ta, and Ti and a positive anomaly in Pb. The basalts exhibit no or a weak positive U anomaly in a spidergram, but the basaltic trachyandesites show a negative U anomaly. The basalts have highly radiogenic Sr [(87Sr/86Sr)i = 0.70722-0.71145], slightly negative ɛNd, positive ɛHf [(ɛNd)i = -2.7 to 0.0; (ɛHf)i = +2.9 to +6.4], and radiogenic Pb isotopic compositions [(206Pb/204Pb)i = 18.20-19.19; (207Pb/204Pb)i = 15.60-15.77; (208Pb/204Pb)i = 38.38-39.11]. The basaltic trachyandesites are characterized by radiogenic Sr [(87Sr/86Sr)i = 0.70576-0.71119] and unradiogenic Nd, Hf, and Pb isotopic compositions [(ɛNd)i = -14.0 to -1.4; (ɛHf)i = -17.9 to +3.7; (206Pb/204Pb)i = 17.83-18.25; (207Pb/204Pb)i = 15.57-15.63; (208Pb/204Pb)i = 38.20-38.70]. The 'crust-like' signatures, such as negative Nb-Ta anomalies, elevated Sr isotopic compositions, and negative ɛNd(t) and ɛHf(t) values, of the basaltic trachyandesites resemble the geochemistry of Early Cretaceous mafic volcanic rocks from the southern portion of the eastern North China Craton. Considering the lower-crust-like low U/Pb and high Th/U ratios and the unradiogenic Pb isotopic compositions, the basaltic trachyandesites are considered to be derived from lithospheric mantle modified by interaction with melts that originated from foundered eclogite

  19. Adherence to the Mediterranean diet among employees in South West England: Formative research to inform a web-based, work-place nutrition intervention

    Directory of Open Access Journals (Sweden)

    Angeliki Papadaki

    2015-01-01

    Conclusion: Improvement in the consumption of several Mediterranean diet components is needed to increase adherence in this sample of adults. The findings have the potential to inform the development of a web-based intervention that will focus on these foods to promote the Mediterranean diet in work-place settings in South West England.

  20. A preliminary report on the biomass of chaetognaths in the Indian Ocean comparing the south-west and north-east monsoon periods

    Digital Repository Service at National Institute of Oceanography (India)

    Nair, V.R.

    sorted and the total number of chaetognaths in the samples were then computed The average number of chaetognaths for all samples from each 5 degrees Marsden Square is separately estimated for the south-west and north-east monsoon periods The period mid...

  1. Urban and community forests of the Southern Atlantic region: Delaware, District of Columbia, Florida, Georgia, Maryland, North Carolina, South Carolina, Virginia, West Virginia

    Science.gov (United States)

    David J. Nowak; Eric J. Greenfield

    2009-01-01

    This report details how land cover and urbanization vary within the states of Delaware, Florida, Georgia, Maryland, North Carolina, South Carolina, Virginia, and West Virginia; and the District of Columbia by community (incorporated and census designated places), county subdivision, and county. Specifically this report provides critical urban and community forestry...

  2. The Effectiveness of Student Involvement in Decision-Making and University Leadership: A Comparative Analysis of 12 Universities in South-West Nigeria

    Science.gov (United States)

    Oni, Adesoji A.; Adetoro, Jeremiah A.

    2015-01-01

    This study examines student involvement in university leadership and decision-making and its impacts on leadership effectiveness in universities in Nigeria. The study uses a descriptive survey conducted among students and staff in all 12 of the public and private universities in South-West Nigeria. The research findings indicate that there is a…

  3. A measure for the efficiency of water use and its determinants, a case study of small-scale irrigation schemes in North-West Province, South Africa

    NARCIS (Netherlands)

    Speelman, S.; Haese, D' M.F.C.; Buysse, J.; Haese, D' L.

    2008-01-01

    This paper analyses the efficiency with which water is used in small-scale irrigation schemes in North-West Province in South Africa and studies its determinants. In the study area, small-scale irrigation schemes play an important role in rural development, but the increasing pressure on water

  4. Reentrainment of the circadian pacemaker during jet lag: East-west asymmetry and the effects of north-south travel.

    Science.gov (United States)

    Diekman, Casey O; Bose, Amitabha

    2018-01-21

    The normal alignment of circadian rhythms with the 24-h light-dark cycle is disrupted after rapid travel between home and destination time zones, leading to sleep problems, indigestion, and other symptoms collectively known as jet lag. Using mathematical and computational analysis, we study the process of reentrainment to the light-dark cycle of the destination time zone in a model of the human circadian pacemaker. We calculate the reentrainment time for travel between any two points on the globe at any time of the day and year. We construct one-dimensional entrainment maps to explain several properties of jet lag, such as why most people experience worse jet lag after traveling east than west. We show that this east-west asymmetry depends on the endogenous period of the traveler's circadian clock as well as daylength. Thus the critical factor is not simply whether the endogenous period is greater than or less than 24 h as is commonly assumed. We show that the unstable fixed point of an entrainment map determines whether a traveler reentrains through phase advances or phase delays, providing an understanding of the threshold that separates orthodromic and antidromic modes of reentrainment. Contrary to the conventional wisdom that jet lag only occurs after east-west travel across multiple time zones, we predict that the change in daylength encountered during north-south travel can cause jet lag even when no time zones are crossed. Our techniques could be used to provide advice to travelers on how to minimize jet lag on trips involving multiple destinations and a combination of transmeridian and translatitudinal travel. Copyright © 2017 Elsevier Ltd. All rights reserved.

  5. MODEL RECONSTRUCTION OF THE VEGETATION COVER OF THE SOUTH OF THE WEST SIBERIAN PLAIN FROM THE LATE PALEOLITHIC PERIOD UNTIL THE LATE XIX CENTURY

    Directory of Open Access Journals (Sweden)

    М. А. Kharitonenkov

    2016-06-01

    Full Text Available Model reconstruction of vegetation cover of the south of the West Siberian Plain from the late Pleistocene to the modern era has been carried out on the basis of the associated chronological analysis of paleontological, archaeological and paleoclimate data. We have determined the starting point of active vegetation transformation in the south of the West Siberian Plain as a result of tradition-bound exploitation of natural resources. Periods of maximum anthropogenic load – peak and relative recession – on vegetation cover, acting as a further determinant factor, have been determined in this study for the first time. Comprehensive analysis and new understanding of palynological, paleozoological, archaeological and paleoclimate data in terms of theoretical synecology confirmed the notions on the determinant role of the anthropogenic factor in the transformation of the Pleistocene forest-meadow-steppe vegetation into contemporary communities of the southern taiga, the subtaiga and the forest-steppe of the West Siberian Plain.

  6. Characteristics of PM10 Chemical Source Profiles for Geological Dust from the South-West Region of China

    Directory of Open Access Journals (Sweden)

    Yayong Liu

    2016-11-01

    Full Text Available Ninety-six particulate matter (PM10 chemical source profiles for geological sources in typical cities of southwest China were acquired from Source Profile Shared Service in China. Twenty-six elements (Na, Mg, Al, Si, K, Ca, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Ga, As, Se, Sr, Cd, Sn, Sb, Ba, Be, Tl and Pb, nine ions (F−, Cl−, SO42−, NO3−, Na+, NH4+, K+, Mg2+ and Ca2+, and carbon-containing species (organic carbon and elemental carbon were determined to construct these profiles. Individual source profiles were averaged and compared to quantify similarities and differences in chemical abundances using the profile-compositing method. Overall, the major components of PM10 in geological sources were crustal minerals and undefined fraction. Different chemical species could be used as tracers for various types of geological dust in the region that resulted from different anthropogenic influence. For example, elemental carbon, V and Zn could be used as tracers for urban paved road dust; Al, Si, K+ and NH4+ for agricultural soil; Al and Si for natural soil; and SO42− for urban resuspended dust. The enrichment factor analysis showed that Cu, Se, Sr and Ba were highly enriched by human activities in geological dust samples from south-west China. Elemental ratios were taken to highlight the features of geological dust from south-west China by comparing with northern urban fugitive dust, loess and desert samples. Low Si/Al and Fe/Al ratios can be used as markers to trace geological sources from southwestern China. High Pb/Al and Zn/Al ratios observed in urban areas demonstrated that urban geological dust was influenced seriously by non-crustal sources.

  7. Transient deep-water oxygenation in the early Cambrian Nanhua Basin, South China

    Science.gov (United States)

    Cheng, Meng; Li, Chao; Zhou, Lian; Feng, LianJun; Algeo, Thomas J.; Zhang, FeiFei; Romaniello, Stephen; Jin, ChengSheng; Ling, HongFei; Jiang, ShaoYong

    2017-08-01

    Many late Neoproterozoic to early Cambrian fossils of multicellular eukaryotes, including those of benthic animals, are found preserved under anoxic and even euxinic bottom-water conditions, which is contradictory to the consensus that oxygen is essential to eukaryotes. To investigate this conundrum, we conducted an integrated study of iron speciation, redox-sensitive trace elements, and Mo isotopes (δ98Mo) on the black shale interval of the lower Cambrian Hetang Formation (∼535-521 Ma) at Lantian, South China, in which benthic sponge fossils are abundant in the lower member (LM) but absent in the upper member (UM). Iron speciation data point to uniformly anoxic-ferruginous conditions in the LM and euxinic conditions in the UM, whereas the trace-element and δ98Mo data show greater secular variation in redox conditions. The LM shows higher mean trace element concentrations (Mo: 108 ppm, U: 36 ppm, V: 791 ppm) and lower and more variable δ98Mo (+0.13 to +1.76‰) relative to the UM (Mo: 45 ppm, U: 18 ppm, V: 265 ppm, δ98Mo: +1.59 to +1.67‰), and ratios of redox-sensitive trace element concentrations to total organic carbon are significantly more variable and higher on average in the LM relative to the UM. The appearance of sponge fossils and lower δ98Mo values correlate strongly with gray (i.e., lighter-colored) layers in the LM. These patterns can best be interpreted as recording mainly euxinic conditions throughout deposition of the study units, with more intense background euxinia in the LM relative to the UM, but also with frequent transient oxygenation events in the LM that do not appear in the UM. The transient oxygenation events of the LM led to the initial colonization of the deep Nanhua Basin by sponges, and the termination of these events in the UM caused sponge faunas to disappear until a general rise in O2 levels later in the Cambrian permitted their return to deeper-water habitats. Our study also illustrates that multiple geochemical and

  8. Analyse sismo-stratigraphique du bassin d'Abda (Maroc occidental), exemple de structures inverses pendant le rifting atlantiqueSeismo-stratigraphic analysis of the Abda Basin (West Morocco): a case of reverse structures during the Atlantic rifting

    Science.gov (United States)

    Echarfaoui, Hassan; Hafid, Mohamed; Salem, Abdallah Aı̈t; Abderrahmane, Aı̈t Fora

    The review of the seismic reflection and well data from the coastal Abda Basin (western Morocco) shows that its Triassic and Jurassic sequences were deposited in a submeridean sag basin, whose eastern margin is characterised by progressive truncations and pinching out of these sequences against a prominent Palaeozoic high. The uplift of this latter is interpreted as a response to an Upper Triassic-Middle Jurassic local compressional event that controlled Triassic-Jurassic sedimentation within the Abda Basin. The present day 'West Meseta Flexure' is a surface expression of this uplift. To cite this article: H. Echarfaoui et al., C. R. Geoscience 334 (2002) 371-377.

  9. Acciones bloqueantes alrededor de los setenta grados oeste en el sur de Sudamérica Blocking action arround seventy degrees West in the South of South America

    Directory of Open Access Journals (Sweden)

    Adelia P. Alessandro

    2005-12-01

    esta situación. La presencia de estos sistemas y la falta de viento N o NE inciden en la extremadamente escasa precipitación recibida en el Noreste de la Argentina, en las altas temperaturas en la Patagonia y bajas temperaturas en el NE y centro del país.Blocking situations near 70ºW south of South America are characterised. Cases which initiate to the west and those to the east of the above- mentioned longitude are distinguished. Averaging all cases it is seen that the Atlantic high as well as the Pacific high is displaced to the south for the first and second group respectively. Four different models result from the Principal Component Analysis, three of which representing blocking situations over the south-eastern Pacific Ocean and one of the south-western Atlantic. The trajectory of those highs that commence to the west have a cuasi zonal orientation with a speed of 20 Km/h, meanwhile those that region to the east have a slight component to the north with a speed of 20.5 Km/h. The mean centre of the anticyclones has a geopotential height of 227.7 gpm. The associated temperature anomalies are negative over most of Argentina, excepting the extreme south and the northeast, for both groups. When the blocking high is to the west of 70ºW the anomalies are more negative over Patagonia and more positive over the north-eastern country. Precipitations in Patagonia are superior with blockings beginning to the east of 70ºW with respect to those that first appear to the west, with exception of Ushuaia (54.48ºS, 68.19ºO station and north-eastern Argentina. The situation of February 2004 is described. This month has been selected because has an extreme low zonal circulation index, a high meridional index and a very high blocking index I with respect to southern summer, showing in the study area the presence of several blocking systems to the south of South America. These systems are associated with a lack of N and NE winds giving extremely low precipitations over north

  10. Ecological similarities between two Mediterranean wetlands: Sidi Boughaba (North-West Morocco and the Doñana National Park (South-West Spain

    Directory of Open Access Journals (Sweden)

    Najat Elkhiati

    2013-04-01

    Full Text Available Addressing the underlying common processes within aquatic systems located in the same geographical region has long been used as a tool for the advancement of limnology. A limnological study of the Merja Sidi Boughaba in 2009 has shown that there are many common features between the physico-chemical and biological conditions of this site and previous data reported from some of the wetlands of the Doñana National Park (South-West Spain. Both are Ramsar sites located on extensive dune systems of the Atlantic coast with a Mediterranean climate. They have a common palaeoenvironmental history that is largely responsible for their similar hydrology and water composition. Oceanic influence has probably produced a slight disproportion of Mg2+ over Ca2+ through airborne sea salt deposition and the surface evaporation of groundwater feeding these wetlands during annual flood and drought cycles. The wide spectrum of environmental conditions encountered in the Doñana wetlands is epitomised by the Merja Sidi Boughaba, where water and sediment gradually change in the same water body from north to south: from humic-coloured waters and a sandy substrate to a calcium-rich substrate with turbid and silted waters which eventually dry out. As a consequence, the community of submersed macrophytes is very rich and dominated by dense charophyte beds. The high primary production coupled with high biodiversity found in the Merja Sidi Boughaba is also shared by the Doñana wetlands. The high conservation status of both sites enables a useful comparison to be made of the water quality of shallow aquatic systems at a regional scale which, contrary to the trophic classifications developed for deep stratified lakes in temperate regions, is not based on regressions between the concentrations of chlorophyll and total phosphorus (Tot-P but on the proportions of dissolved and particulate P pools. In these Mediterranean sites, nutrients are more efficiently recycled through the

  11. Determining Deep Basin Structure of the Hueco and southern Mesilla Bolsons, West Texas, Southern New Mexico and Northern Chihuahua Using Nonseismic Geophysical Techniques

    Science.gov (United States)

    Doser, D. I.; Avila, V.; Budhathoki, P.; Marrufo, S.; Montana, C. J.; Kaip, G.; Moncada, M.; Dena Ornelas, O.

    2012-12-01

    The Hueco and southern Mesilla bolsons are the primary groundwater source for much of the El Paso/Ciudad Juarez metropolitan region of over 1 million residents. The bolsons lie at the point where the strike of the southern Rio Grande rift changes from north-south to northwest-southeast, likely due to its interaction with pre-existing Mesozoic and Paleozoic structures. Tectonic activity continues with recent (Cristo Rey laccolith. Intrabasin faults in the Hueco Bolson appear to cut the basin into at least 3 smaller subbasins and to control the boundary between fresh and saline water within the aquifer system beneath El Paso. We are also able to trace the East Franklins Mountain fault (last movement < 15,000 ya) at least 15 km south of the U.S.-Mexico border.

  12. Geochemical characteristics of natural gas in the Yinggehai-Qiongdongnan Basin, South China Sea

    Energy Technology Data Exchange (ETDEWEB)

    Fengrong Liao; Xiaoqi Wu; Shipeng Huang [PetroChina, Beijing (China). Research Institute of Petroleum Exploration & Development

    2010-03-15

    Geochemical characteristics of natural gas in the Yinggehai-Qiongdongnan Basin were studied and analyzed based on gas component properties and carbon isotopic characteristics which were tested and collected of more than 100 samples. The gas in the Yinggehai-Qiongdongnan Basin was generally alkane gas, and all the area showed dry gas characteristics except Yanan Depression and its periphery area. The gas in the Basin is mainly high mature-over mature coal formed gas except Songnan and eastern of the second fault belt. There are three genetic types of the natural gas in the Yinggehai-Qiongdongnan Basin, such as microbial gas, coal-formed gas and the mixture of them. The coal-formed gas is the main genetic type.

  13. Assessment of Permian coalbed gas resources of the Karoo Basin Province, South Africa and Lesotho, 2016

    Science.gov (United States)

    Schenk, Christopher J.; Brownfield, Michael E.; Tennyson, Marilyn E.; Klett, Timothy R.; Mercier, Tracey J.; Hawkins, Sarah J.; Gaswirth, Stephanie B.; Marra, Kristen R.; Finn, Thomas M.; Le, Phuong A.; Leathers-Miller, Heidi M.

    2017-02-21

    Using a geology-based assessment methodology, the U.S. Geological Survey estimated undiscovered, technically recoverable mean resources of 5.27 trillion cubic feet of coalbed gas in the Karoo Basin Province.

  14. Freshwater Mussel Surveys Of The Pee Dee River Basin in South Carolina

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — The Pee Dee River Basin is a major drainage of the Atlantic slope in the southeastern United States. The 10,755 sq mile drainage area incorporates portions of...

  15. Gender Differences related to HIV/AIDS in South West Nigeria | Uti ...

    African Journals Online (AJOL)

    The aim of this study was to determine some underlying gender differences in the pattern of infection in a group of HIV positive patients in Nigeria. It involved 328 consecutive HIV positive patients attending dedicated clinics at four teaching hospitals in the South western part of Nigeria. Information on patients' ...

  16. Large-scale changes in the spatial distribution of South African West ...

    African Journals Online (AJOL)

    Whereas the 1990s was a period of change, the period 2000 to present has been one of relative stability in lobster catches. ... of reduced somatic growth and increased lobster walkouts suggests environmental forcing factors, as do congruent changes in other components of South Africa's Western Cape marine ecosystems.

  17. Food habits of some deep-sea fish off South Africa's west coast and ...

    African Journals Online (AJOL)

    ... shrimps and squid formed part of the diet of all species. These prey, taken at the bathyal/deep-pelagic interface, are an important source of energy transport from productive surface waters to the deep benthos. Keywords: deep-sea fish, diet, feeding, grenadiers, Macrouridae, South Africa African Journal of Marine Science ...

  18. trade on non-timber forest products (ntfps) between south west ...

    African Journals Online (AJOL)

    DJFLEX

    INTRODUCTION. Forest, apart from timber, forest contains many useful goods and services of subsistence and commercial value called Non-Timber Forest Products ... A. F. Nkwatoh, Department of Geology and Environmental Science, University of Buea, P.O. Box 63 Buea, South ... The study area has a humid tropical.

  19. In search of a merged identity: the case of multi-campus North-West University, South Africa

    Directory of Open Access Journals (Sweden)

    Frans Kamsteeg

    2008-04-01

    Full Text Available South Africa’s post–apartheid governments have taken far–reaching policy measures to transform the system of higher education, do away with its strongly segregated character, and develop an efficient and internationally recognised system that provides equal chances for all ethnic groups. Since 2002 higher education has become the explicit target of a government policy, geared to cultural development and intervention, including the enforcement of a series of mergers between traditionally white and black universities and former technikons (currently universities of technology. This process has caused intense debate at the level of leadership and among policy makers in these institutions, but little is known of how this ideological battle over educational development has affected daily academic practice. This paper gives a first, somewhat tentative discussion on the current effects of the changes in higher education in South Africa, and in particular at one of the institutions affected: the newly merged North-West University (NWU. The article is based on documentary research and three personal visits to the university; in the process a joint research project was initiated between the VU University of Amsterdam (VUUA and NWU. This paper attempts to shed some early light on how efficiency and social equity goals are met within NWU’s institutional merger, beginning from a cultural perspective that focuses on the construction of ‘merger narratives’. The paper also gives a voice to critical reactions, narratives of resistance that have emerged from the university shop floor.

  20. Diversity and distribution of diazotrophic communities in the South China Sea deep basin with mesoscale cyclonic eddy perturbations.

    Science.gov (United States)

    Zhang, Yao; Zhao, Zihao; Sun, Jun; Jiao, Nianzhi

    2011-12-01

    The South China Sea (SCS) is an oligotrophic subtropical marginal ocean with a deep basin and a permanently stratified central gyre. Upwelling and nitrogen fixation provide new nitrogen for primary production in the SCS. This study was aimed at an investigation of phylogenetic diversity and quantification of the diazotroph community in the SCS deep basin, which is characterized by frequent mesoscale eddies. The diazotroph community had a relatively low diversity but a distinct spatial heterogeneity of diversity in the SCS deep basin. The potential for nitrogen fixation consistently occurred during cyclonic eddies, although upwelling of nutrient-replete deep water might have alleviated nitrogen limitation in the SCS. However, diazotrophic proteobacteria were dominant, but neither Trichodesmium nor heterocystous cyanobacterial diatom symbionts. Quantitative PCR analysis using probe-primer sets developed in this study revealed that the nif H gene of the two dominant alpha- and gammaproteobacterial groups was at the highest abundance (up to 10(4) to 10(5)  copies L(-1) ). Trichodesmium thiebautii was detected with an average density of 10(2)  trichomes L(-1) in the euphotic waters, while Richelia intracellularis was observed sporadically under the microscope. The unicellular cyanobacterial groups A and B were not detected in our libraries. Our results suggested that diazotrophic proteobacteria were significant components potentially contributing to nitrogen fixation in this oligotrophic marginal ocean ecosystem. © 2011 Federation of European Microbiological Societies. Published by Blackwell Publishing Ltd. All rights reserved.

  1. Geodynamic models assist in determining the South Loyalty Basin's slab location and its implications for regional topography

    Science.gov (United States)

    Clark, Stuart R.

    2010-05-01

    In the Western Pacific, two competing kinematic reconstructions exist: one with wholly westward subduction of the Pacific plate at what is now the Tonga-Kermadec trench and one combining a degree of eastward subduction under what has been termed the New Caledonia trench. New seismological observations indicate that eastward subduction could explain the existence of a fast anomaly, the hyothesised South Loyalty Basin slab, below the 660km transition zone distinct from the fast anomaly aligned with the Tonga-Kermadec slab. A plate reconstruction dated from the suggested initiation of New Caledonia subduction in the Eocene has been developed. This reconstruction is then used to predict the thermal history of the region and together provide kinematic and thermal boundary conditions for a regional mantle convection model. The model-predicted location of the South Loyalty Basin slab's location will be presented along with the location's dependence on the mantle rheological parameters and the hotspot reference frame. The implications for the topography of the region will also be discussed.

  2. Evidence for episodic expulsion of hot fluids along faults near diapiric structures of the Yinggehai Basin, South China Sea

    Energy Technology Data Exchange (ETDEWEB)

    Xinong Xie; Sitian Li [China University of Geosciences, Wuhan (China). College of Earth Resources; Weiliang Dong; Zhongliang Hu [China Offshore Oil Nanhai West Corp., Zhanjiang (China)

    2001-06-01

    Diapiric structures are well developed and occur in most of the central part of the Yinggehai Basin, on the western side of the South China margin. A strong thermal anomaly due to hot fluid flows occurs in the diapiric zone, as evidenced from vitrinite reflectance (R{sub o}), clay mineral transformation, and fluid inclusion homogenization temperatures. This anomaly results from hydrothermal fluid flow along vertical faults from overpressured compartments into the overlying Late Miocene and Quaternary sand-rich layers. The magnitude of thermal anomaly is related not only to the distance to which the vertical fault is hydraulically open, but the permeability of rocks interconnected with the faults. Intense heat transfer for convection of fluids occurs in the sand-rich intervals adjacent to vertical faults. Abnormal organic-matter maturation, together with rapid transformation of clay minerals, which occurs at certain intervals within the present-day normally pressured system and normal conductive temperatures in a diapir, can be used to identify palaeo high pressure zones. Abnormal high temperatures measured from a drill-stem test in a diapir can be inferred to be the results of recent expulsion of hydrothermal fluid flow. The results of this study suggest that thermal fluid expulsion along faults plays an important role in the modification of thermal regimes, the enhancement of organic-matter maturation, and rapid transformation of clay minerals, as well as the accumulation of hydrocarbons in diapiric structures of the Yinggehai Basin, South China Sea. (author)

  3. Stress distribution and seismicity patterns of the 2011 seismic swarm in the Messinia basin, (South-Western Peloponnesus, Greece

    Directory of Open Access Journals (Sweden)

    G. Chouliaras

    2013-01-01

    Full Text Available In this investigation we examine the local stress field and the seismicity patterns associated with the 2011–2012 seismicity swarm in the Messinia basin, south-western Peloponnesus, Greece, using the seismological data of the National Observatory of Athens (NOA. During this swarm more than 2000 events were recorded in a 12 month period by the Hellenic Unified Seismological Network (HUSN and also by the additional local installation of four portable broadband seismographic stations by NOA.

    The results indicate a Gaussian distribution of swarm activity and the development of a seismicity cluster in a pre-existing seismic gap within the Messinia basin. Centroid Moment Tensor solutions demonstrate a normal fault trending northwest–southeast and dipping to the southwest primarily due to an extensional stress field. During this seismicity swarm an epicentre migration of the three largest shocks is observed, from one end of the rupture zone in the north-western part of the cluster, towards the other edge of the rupture in the south-eastern part of the cluster. This migration is found to follow the Coulomb failure criterion that predicts the advancement and retardation of the stress field and the patterns of increases and decreases of the seismicity rate (b-value of the frequency–magnitude relation.

  4. Structural characteristics of annual precipitation in Lake Urmia basin

    Science.gov (United States)

    Vaheddoost, Babak; Aksoy, Hafzullah

    2017-05-01

    Precipitation as the main process that brings evaporated water from the oceans to the land's surface is a critical role player in Lake Urmia basin (Iran). As a hyper-saline lake declared as UNESCO's biosphere reserve in Ramsar Convention, it is dealing with gradual atrophy. In this study, characteristics of annual precipitation in the Lake Urmia basin are investigated by means of several statistical measures and tests. Data in 53 meteorological stations widespread across the basin for a period of 31 years from 1981 to 2011 are considered for analysis. Fundamental statistical characteristics of the data like mean, maximum, minimum, standard deviation, coefficient of variation, coefficient of skewness, coefficient of kurtosis, auto-correlation and cross-correlation coefficients of the annual precipitation are calculated. Entropy in each station is also calculated with respect to the long-run mean precipitation of the basin. Results of the analysis are plotted in contour maps. Several tests for consistency, randomness, trend and best-fit probability distribution function are applied to investigate characteristics of the annual precipitation. Heterogeneity and dependence on local conditions are the main results revealed by this study while consistency and dependency of precipitation on North West and West of the basin are considered as the most effective among other regions. Due to the North-South oriented mountains, a relatively sharp decline in the precipitation from West to East can be compared to the gradual decline in precipitation from North to South due to smooth change in the terrain. It is also seen that such characteristics as probability distribution, consistency, randomness, trend, and uncertainty of annual precipitation in the Lake Urmia basin become more complex as crossing from West to East than crossing from North to South on the basin.

  5. A reindeer footprint in a drilling core from the Allerød-Bølling age succession of Lille Slotseng basin, south-eastern Jylland, Denmark

    DEFF Research Database (Denmark)

    Noe-Nygaard, Nanna; Milàn, Jesper; Hede, Mikkel Ulfeldt

    2005-01-01

    A Subfossil reindeer track was localised in a drilled core from the Late Glacial Slotseng lacustrine basin, located in the south eastern part of Jylland near the town of Jels. It was dated to 11,795 ±80 14C yr BP or around 13,780 cal yr BP. During an earlier excavation of the site four skeletons...... shore woody peat from the Boreal and onset of the Atlantic Time, cover the basin. Hitherto, no convincing tracks have been recognized and described from drill cores. The reindeer track from the Slotseng Basin is the first convincing track recognized from a drill core section. 89...

  6. Surface Fluxes and Characteristics of Drying Semi-Arid Terrain in West Africa

    NARCIS (Netherlands)

    Schüttemeyer, D.; Moene, A.F.; Holtslag, A.A.M.; Debruin, H.A.R.; Giesen, van de N.C.

    2006-01-01

    This study examines the seasonal cycle of the components of the surface energy balance in the Volta basin in West Africa as part of the GLOWA-Volta project. The regional climate is characterized by a strong north¿south gradient of mean annual rainfall and the occurrence of pronounced dry and wet

  7. Geology, compositional heterogeneities, and geochemical origin of the Yacheng gas field, Qiongdongnan Basin, South China Sea

    Energy Technology Data Exchange (ETDEWEB)

    Hao, F.; Li, S.; Sun, Y. [China Univ. of Geosciences, Wuhan, Hubei (China). Dept. of Petroleum Geology; Zhang, Q. [Nanhai West Oil Corp., Guangdong (China). Inst. of Petroleum Exploration and Development

    1998-07-01

    The Yacheng gas field is located in the footwall of the No. 1 fault, the boundary fault between the Yinggehai and Qiongdongnan basins. All strata are normally pressured in the gas field except for the Meishan Formation. The Meishan Formation is overpressured near the No. 1 fault in the gas field and in the adjacent Yinggehai Basin. An obvious thermal anomaly occurs below 3600 m in the gas field. This anomaly, characterized by an abrupt increase in drill-stem test and fluid-inclusion homogenization temperatures, vitrinite reflectance (R{sub o}), and Rock-Eval T{sub max}, and by an abnormally low temperature/R{sub o}/T{sub max} gradient, diminishes away from the Yinggehai Basin. The gases and condensates have abnormally high aromatic hydrocarbon contents and show obvious heterogeneities. Away from the No. 1 fault, the C{sub 2+} hydrocarbon content and C{sub 2+}/{Sigma}C{sub n} increase; carbon dioxide content decreases; {delta}{sup 13}C values for methane, ethane, and carbon dioxide become lighter; the heptane and isoheptane values decrease; and the relative contents of aromatic hydrocarbons, both in C{sub 6}/C{sub 7} light hydrocarbons and in the condensates, decrease. The gas field was charged from both the Qiongdongnan and the Yinggehai basins. Hydrocarbons sourced from the Qiongdongnan Basin have relatively low maturities, whereas hydrocarbons from the Yinggehai Basin have relatively higher maturities and seem to have been in association with hydrothermal fluids. The hydrothermal fluids from the Yinggehai Basin, in which methane, ethane, carbon dioxide, and especially aromatic hydrocarbons dissolved under the high-temperature and high-pressure subsurface conditions, migrated along the No. 1 fault and caused the abnormally high concentration of aromatic hydrocarbons, as well as the thermal anomalies in the gas field, especially near the No. 1 fault.

  8. Investigation on the 1970s and 1980s droughts in four tributaries of the Niger River Basin (West Africa).

    CSIR Research Space (South Africa)

    Badou, DF

    2015-07-01

    Full Text Available West Africa has experienced severe droughts during 1970s and 1980s. On the other hand, the region is characterized by high inter-annual rainfall variability and there seems to be a recent recovery. But has the drought stopped? To answer...

  9. Evaluation of recent hydro-climatic changes in four tributaries of the Niger River Basin (West Africa)

    CSIR Research Space (South Africa)

    Badou, DF

    2017-10-01

    Full Text Available West Africa experienced severe drought during the 1970s and 1980s, posing a threat to water resources. A wetter climate more recently suggests recovery from the drought. The Mann-Kendall trend and Theil-Sen’s slope estimator were applied to detect...

  10. The impact of climate change on crop production in West Africa : An assessment for the Oueme River Basin in Benin

    NARCIS (Netherlands)

    Sonneveld, B.G.J.S.; Keyzer, M.A.; Adegbola, P.; Pande, S.

    2011-01-01

    Climate change studies forWest Africa tend to predict a reduced potential for farming that will affect the food security situation of an already impoverished population. However, these studies largely ignore farmers’ adaptations and market adjustments that mitigate predicted negative effects. The

  11. Future water resources for food production in five South Asian river basins and potential for adaptation--a modeling study.

    Science.gov (United States)

    Biemans, H; Speelman, L H; Ludwig, F; Moors, E J; Wiltshire, A J; Kumar, P; Gerten, D; Kabat, P

    2013-12-01

    The Indian subcontinent faces a population increase from 1.6 billion in 2000 towards 2 billion around 2050. Therefore, expansion of agricultural area combined with increases in productivity will be necessary to produce the food needed in the future. However, with pressure on water resources already being high, and potential effects of climate change still uncertain, the question rises whether there will be enough water resources available to sustain this production. The objective of this study is to make a spatially explicit quantitative analysis of water requirements and availability for current and future food production in five South Asian basins (Indus, Ganges, Brahmaputra, Godavari and Krishna), in the absence or presence of two different adaptation strategies: an overall improvement in irrigation efficiency, and an increase of reservoir storage capacity. The analysis is performed by using the coupled hydrology and crop production model LPJmL. It is found that the Godavari and Krishna basins will benefit most from an increased storage capacity, whereas in the Ganges and the Indus water scarcity mainly takes place in areas where this additional storage would not provide additional utility. Increasing the irrigation efficiency will be beneficial in all basins, but most in the Indus and Ganges, as it decreases the pressure on groundwater resources and decreases the fraction of food production that would become at risk because of water shortage. A combination of both options seems to be the best strategy in all basins. The large-scale model used in this study is suitable to identify hotspot areas and support the first step in the policy process, but the final design and implementation of adaptation options requires supporting studies at finer scales. © 2013.

  12. Results of a gravity survey of the south-west margin of Dartmoor, Devon

    OpenAIRE

    Tombs, J.M.C.

    1980-01-01

    A gravity survey (station density 4-6 per km2) of the south-western margin of Dartmoor, including the Hemerdon stockwork, was interpreted using previously developed computer techniques, with some refinements, to indicate the depth to buried granite. The results showed (i) that the Hemerdon Ball granite is an isolated block and does not extend to depth, and (ii) that no vertically-continuous shallow granite occurs at any distance from the known outcrop. Various computer-graph...

  13. Palinspastic reconstruction and geological evolution of Permian residual marine basins bordering China and Mongolia

    Directory of Open Access Journals (Sweden)

    Gen-Yao Wu

    2014-04-01

    Full Text Available One main feature of the tectono-paleogeographic evolution of the southern branch of the Paleo-Asian Ocean was that there developed residual marine basins in former backarc/forearc regions after the disappearance of oceanic crust. The paper illustrates the viewpoint taking the evolution of Dalandzadgad and Solonker oceanic basins as examples. The Dalandzadgad ocean subducted southwards during the Silurian-Devonian, created an intra-oceanic arc and a backarc basin in southern Mongolia. In addition, a continent marginal arc formed along the national boundary between China and Mongolia, the south of which was a backarc basin. The oceanic basin closed and arc–arc (continent collision occurred during the early Early Permian, followed by two residual marine basins developing in the former backarc regions, named the South Gobi Basin in southern Mongolia and the Guaizihu Basin in western Inner Mongolia. The Solonker ocean subducted southwards and finally disappeared during the early Middle Permian. Afterwards, two residual marine basins occurred in northern China, the Zhesi Basin being situated in the former backarc region and the Wujiatun Basin in the former forearc region. The late Middle Permian was the most optimum period for the developing residual marine basins, when they covered a vast area. The basin evolution differentiated during the early Late Permian, with a general trend of uplift in the east and of subsidence in the west. The Upper Permian in the South Gobi Basin was characterized by coal-bearing strata hosting economically valuable coal fields. A transgression invaded westwards and the Chandmani-Bayanleg Basin was created in southwest Mongolia during the middle-late stage of the Late Permian. Correspondingly, the coal formation entered a flourishing time, with thick coal beds and sedimentary interbeds. All of these basins, namely, both the marine and nonmarine residual basins, reversed and closed by the end of Permian.

  14. Seismic attribute analysis to enhance detection of thin gold-bearing reefs: South Deep gold mine, Witwatersrand basin, South Africa

    CSIR Research Space (South Africa)

    Manzi, MSD

    2013-11-01

    Full Text Available was observed, with several depth discrepancies below the vertical seismic resolution limit (~25 m). This information can now be incorporated into the current mine geological model, thus improving the resource evaluation of the Upper Elsburg Reef in the South...

  15. Epidemiological studies on Fasciola hepatica in Gafsa oases (South West of Tunisia

    Directory of Open Access Journals (Sweden)

    Hammami H.

    2007-09-01

    Full Text Available Epidemiological investigations on Fasciola hepatica fasciolasis were carried out from July 2004 to June 2005 in the Gafsa oases (Tunisia after the detection of a human case. Three habitats were studied: one in El Gsar and two in Ain Soltan. The prevalence of human infection was 6.6 %. The presence of the parasite was detected through serology in 14.3 % of cattle, 35 % of sheep and 68.4 % of goats. The plants Apium nodiflorum, Oxalis cernua and Sonchus maritimus were suspected to be at the origin of animal contamination and Apium nodiflorum was incriminated in human infection. The prevalence of the infection of the intermediate host Galba truncatula (G. truncatula was 19.2 % from July 2004 to June 2005. Gafsa oases constitute a new location for the development of fasciolasis in the southern west of Tunisia.

  16. Variability of mineral dust deposition in the western Mediterranean basin and south-east of France

    Directory of Open Access Journals (Sweden)

    J. Vincent

    2016-07-01

    Full Text Available Previous studies have provided some insight into the Saharan dust deposition at a few specific locations from observations over long time periods or intensive field campaigns. However, no assessment of the dust deposition temporal variability in connection with its regional spatial distribution has been achieved so far from network observations over more than 1 year. To investigate dust deposition dynamics at the regional scale, five automatic deposition collectors named CARAGA (Collecteur Automatique de Retombées Atmosphériques insolubles à Grande Autonomie in French have been deployed in the western Mediterranean region during 1 to 3 years depending on the station. The sites include, from south to north, Lampedusa, Majorca, Corsica, Frioul and Le Casset (southern French Alps. Deposition measurements are performed on a common weekly period at the five sites. The mean dust deposition fluxes are higher close to the northern African coasts and decrease following a south–north gradient, with values from 7.4 g m−2 year−1 in Lampedusa (35°31′ N, 12°37′ E to 1 g m−2 year−1 in Le Casset (44°59′ N, 6°28′ E. The maximum deposition flux recorded is of 3.2 g m−2 wk−1 in Majorca with only two other events showing more than 1 g m−2 wk−1 in Lampedusa, and a maximum of 0.5 g m−2 wk−1 in Corsica. The maximum value of 2.1 g m−2 year−1 observed in Corsica in 2013 is much lower than existing records in the area over the 3 previous decades (11–14 g m−2 year−1. From the 537 available samples, 98 major Saharan dust deposition events have been identified in the records between 2011 and 2013. Complementary observations provided by both satellite and air mass trajectories are used to identify the dust provenance areas and the transport pathways from the Sahara to the stations for the studied period. Despite the large size of African dust plumes detected by satellites, more

  17. Late Quaternary loess landscape evolution on an active tectonic margin, Charwell Basin, South Island, New Zealand

    Science.gov (United States)

    Hughes, Matthew W.; Almond, Peter C.; Roering, Joshua J.; Tonkin, Philip J.

    2010-10-01

    Loess deposits constitute an important archive of aeolian deposition reflecting wider patterns of glacial atmospheric circulation, and more localised interactions between riverine source areas, loess trapping efficiency and geomorphic controls on erosion rate. Conceptual models have been formulated to explain the coeval evolution of loess mantles and associated landscapes (loess landscape models) but none apply to areas of tectonically induced base-level lowering. This study uses an age sequence of alluvial fill terraces in the Charwell Basin, north-eastern South Island New Zealand, which straddles the transpressive Hope Fault, to investigate geomorphic controls on loess landscape evolution in an active tectonic region. We hypothesize that the more evolved drainage networks on older terraces will more effectively propagate base-level lowering by way of a greater areal proportion of steep and convex hillslopes and a smaller proportion of non-eroding interfluves. Eventually, as the proportion of interfluves diminishes and hillslope convexity increases, terraces shift from being net loess accumulators to areas of net loess erosion. We investigate the nature of erosion and the geomorphic thresholds associated with this transition. Morphometric analysis of alluvial terraces and terrace remnants of increasing age demonstrated geomorphic evolution through time, with a decrease in extent of original planar terrace tread morphology and an increase in frequency of steeper slopes and convexo-concave land elements. The number of loess sheets and the thickness of loess increased across the three youngest terraces. The next oldest (ca. 150 ka) terrace remnant had the greatest maximum number of loess sheets (3) and loess thickness (8 m) but the loess mantle was highly variable. A detailed loess stratigraphic analysis and the morphometric analysis place this terrace in a transition between dominantly planar, uniformly loess-mantled landforms and loess-free ridge and valley terrain

  18. The stable isotopic and chemical composition of pedogenic carbonate in the Minusinsk Basin, South Siberia

    Science.gov (United States)

    Vasilchuk, Jessica; Ivanova, Elena; Krechetov, Pavel; Litvinskiy, Vladimir; Budantseva, Nadine; Chizhova, Julia; Vasil'chuk, Yurij

    2017-04-01

    Stable isotope composition of carbonate neoformations can be used as a proxy for the reconstructons of environmental conditions of the past. Carbonate coatings on coarse rock framents are studied in order to indicate the climatic conditions and predominant vegetation under which they were formed. Such coatings commonly occur in different types of soils and paleosols of South Siberian intermountain basins mainly in relatively dry modern conditions. The purpose of the research is to characterize the isotopic composition and chemical composition of carbonate pedofeatures in soils of Minusink Hollow and estimate its correlation with defferent factors. The samples of pedogenic carbonates, vegetation, carbonate parent material, soil water and precipitation water were analyzed using the Delta-V mass spectrometer with options of a gas bench and element analyser. The soils we studied are mainly Kastanozems that are poorly moisturized; therefore, soil pore water was extracted by ethanol. Minor and major elements content was also measured by ICP-MS. Carbonates mostly contain calcuim (37-45%) and highly enriched in Pb, Tl and Ba. Oxygen and carbon isotopic composition of pedogenic carbonates was analyzed in 3 key sites. Kazanovka Khakass state national reserve, Hankul salt lake, region of Sayanogorsk aluminum smelter. Vegetation photosynthetic pathway in the region is mainly C3. δ18O values of carbonate coatings in soils of Kazanovka vary in a range from -7.49 to -10.5‰ (vs V-PDB). The lowest values corresponds the coatings found between two buried mid-Holocene soil horizons. That may indicate cooler conditions of late Holocene than nowadays. In Sayanogorsk carbonates' δ18O values' range is -8.3...-11.1‰ and near the Hankul Lake is -9.0...-10.2‰ all ranges are quite similar and may indicate close conditions of pendants formation. δ13C values of carbonate coatings in Kazanovka vary from -2.5 to -6.7‰, the highest values correspond to the soils of Askiz and Syglygkug

  19. Adsorption kinetics of CO2, CH4, and their equimolar mixture on coal from the Black Warrior Basin, West-Central Alabama

    Science.gov (United States)

    Gruszkiewicz, M.S.; Naney, M.T.; Blencoe, J.G.; Cole, D.R.; Pashin, J.C.; Carroll, R.E.

    2009-01-01

    Laboratory experiments were conducted to investigate the adsorption kinetic behavior of pure and mixed gases (CO2, CH4, approximately equimolar CO2 + CH4 mixtures, and He) on a coal sample obtained from the Black Warrior Basin at the Littleton Mine (Twin Pine Coal Company), Jefferson County, west-central Alabama. The sample was from the Mary Lee coal zone of the Pottsville Formation (Lower Pennsylvanian). Experiments with three size fractions (45-150????m, 1-2??mm, and 5-10??mm) of crushed coal were performed at 40????C and 35????C over a pressure range of 1.4-6.9??MPa to simulate coalbed methane reservoir conditions in the Black Warrior Basin and provide data relevant for enhanced coalbed methane recovery operations. The following key observations were made: (1) CO2 adsorption on both dry and water-saturated coal is much more rapid than CH4 adsorption; (2) water saturation decreases the rates of CO2 and CH4 adsorption on coal surfaces, but it appears to have minimal effects on the final magnitude of CO2 or CH4 adsorption if the coal is not previously exposed to CO2; (3) retention of adsorbed CO2 on coal surfaces is significant even with extreme pressure cycling; and (4) adsorption is significantly faster for the 45-150????m size fraction compared to the two coarser fractions. ?? 2008 Elsevier B.V.

  20. Late Cenozoic magnetostratigraphy and anisotropy of magnetic susceptibility of the Baiyanghe section from the Hoxtolgay Basin: Implications for the uplift of the West Junggar Mt Range, NW China

    Science.gov (United States)

    Ai, Keke; Ji, Junliang; Wang, Guocan; Zhang, Kexin; Tang, Zihua

    2017-05-01

    To better constrain the tectonic evolution of Central Asia under the influence of the India-Asia collision, we performed combined magnetostratigraphy and anisotropy of magnetic susceptibility (AMS) analysis of the Baiyanghe section on the northern margin of the Hoxtolgay Basin (West Junggar Mt Range, northwestern China). The observed magnetostratigraphy shows a total of 14 pairs of normal and reversed geomagnetic polarity zones in the well-exposed ∼360 m thick section. In tandem with two ESR dating results, these zones can be reliably correlated with the geomagnetic polarity time scale (GPTS) from C3An.2r to C1n, and yield an age ranging from ∼7.0 Ma to ∼0.2 Ma. The long hiatus between the Mesozoic and the late Cenozoic, corresponding to the age of the basal conglomerates, suggests that uplift of the West Junggar Mt Range was initiated at least at ∼7.0 Ma ago. Furthermore, the onset of massive conglomerate deposits, as well as marked increases in sedimentation rate, k, T and Pj of AMS, occurred at ∼3.6 Ma. These notable changes are coeval with the peak deformation in Central Asia. Considering the depositional diachroneity of the Xiyu conglomerates and the predominantly dry climate in Central Asia since at least the late Cenozoic, we suggest that accelerated uplift of the West Junggar Mt Range at ∼3.6 Ma should be the main factor controlling these multiple changes within the Baiyanghe section. Another marked increase in conglomerate content, sedimentation rate and κ occurred at ∼1.1 Ma. The cause of this event deserves further investigation in the future.

  1. Geophysical properties of cap rocks in Qiongdongnan Basin, South China Sea

    Energy Technology Data Exchange (ETDEWEB)

    Shisheng Hao; Zhilong Huang; Guangdi Liu; Yuling Zheng [University of Petroleum, Beijing (China)

    2000-04-01

    Based on measured petrophysical properties and statistical methods, relationship between petrophysical properties and well log and seismic parameters are established empirically to evaluate the quality of cap rocks in Qiongdongnan Basin. Good cap rocks show high density and low sonic travel time. Four zones can be divided vertically according to displacement pressures in Qiongdongnan Basin , best seal quality is found in the depth range of 2000-4000 m. The Ya 13-1 structure has excellent cap rock, which contributes to its abundant gas accumulation. (Author)

  2. Sedimentary basin analysis and petroleum potential of the Cretaceous and Tertiary strata in Korea.

    Energy Technology Data Exchange (ETDEWEB)

    Son, Jin-Dam; Kwak, Young-Hoon; Bong, Pil-Yoon [Korea Institute of Geology Mining and Materials, Taejon (KR)] (and others)

    1999-12-01

    Since 1992 sedimentary basin analysis to assess petroleum potential of the Cretaceous and Tertiary strata in the Korean onshore and continental shelf have been carried out. The Cretaceous non-marine strata mainly occupy the Gyeongsang Basin in southeastern part of the Korean Peninsula and small basins such as Haenam and Gyeokpo depressions in western coastal areas. The Tertiary strata are mostly distributed in Domi, Cheju, Socotra subbasins, and Okinawa Trough in the South Continental Shelf, and Kunsan and Heuksan basins in the West. The basin evolution and petroleum potential for each basins are characterized as follow. The Cretaceous Gyeongsang sediments were deposited in three subbasins including Milyang, Euisung and Yongyang subbasins. The black shales in Nakdong and Jinju formations are interpreted to contain abundant organic matter during the deposition, thermal maturity reaching up to the zone of dry gas formation. Because porosity and permeability are too low, the sandstones can act as a tight gas reservoir rather than conventional oil and gas reservoir. The latest Cretaceous strata of Haenam and Kyeokpo depressions in western coastal area are correlated into the Yuchon Volcanic Group of the Gyeongsang Basin. Petroleum potential of the Early Cretaceous basin in the West Continental Shelf could be relatively high in terms of sedimentary basin filled with thick lacustrine sediments. The Kunsan basin in the West Continental Shelf originated in the Early Cretaceous time expanded during the Paleocene time followed by regional erosion at the end of Paleocene on which Neogene sediment have been accumulated. The Paleocene-Eocene sublacustrine shales may play an major role as a source and cap rocks. South Continental Shelf Basin is subdivided by Cheju subbasin in the center, Socotra Subbasin to the west, Domi Subbasin to the northeast and Okinawa Trough to the East. The potential hydrocarbon traps associated with anticline, titled fault blocks, fault, unconformity

  3. Determination of the water quality index ratings of water in the Mpumalanga and North West provinces, South Africa

    Science.gov (United States)

    Wanda, Elijah M. M.; Mamba, Bhekie B.; Msagati, Titus A. M.

    2016-04-01

    This study reports on the water quality index (WQI) of wastewater and drinking water in the Mpumalanga and North West provinces of South Africa. The WQI is one of the most effective tools available to water sustainability researchers, because it provides an easily intelligible ranking of water quality on a rating scale from 0 to 100, based on the ascription of different weightings to several different parameters. In this study the WQI index ratings of wastewater and drinking water samples were computed according to the levels of pH, electrical conductivity (EC), biochemical oxygen demand (BOD), E. coli, temperature, turbidity and nutrients (nitrogen and phosphates) found in water samples collected from the two provinces between June and December, 2014. This study isolated three groups of WQ-rated waters, namely: fair (with a WQI range = 32.87-38.54%), medium (with a WQI range = 56.54-69.77%) and good (with a WQI range = 71.69-81.63%). More specifically, 23%, 23% and 54% of the sampled sites registered waters with fair, medium and good WQ ratings respectively. None of the sites sampled during the entire period of the project registered excellent or very good water quality ratings, which would ordinarily indicate that no treatment is required to make it fit for human consumption. Nevertheless, the results obtained by the Eerstehoek and Schoemansville water treatment plants in Mpumalanga and North West provinces, respectively, suggest that substantial improvement in the quality of water samples is possible, since the WQI values for all of the treated samples were higher than those for raw water. Presence of high levels of BOD, low levels of dissolved oxygen (DO), E. coli, nitrates and phosphates especially in raw water samples greatly affected their overall WQ ratings. It is recommended that a point-of-use system should be introduced to treat water intended for domestic purposes in the clean-water-deprived areas.

  4. Emsian (late Early Devonian) sponges from west-central and south-central Alaska

    Science.gov (United States)

    Rigby, J.K.; Blodgett, R.B.; Anderson, N.K.

    2009-01-01

    Relatively common specimens of the hypercalcified agelasiid sponge Hormospongia labyrinthica Rigby and Blodgett, 1983 and specimens of associated species of Hormospongia have been previously reported from Emsian and Eifelian stratigraphic units at several localities in south-central and southeastern Alaska (Rigby and Blodgett, 1983). Those sponges were first described from the type section of the Eifelian Cheeneetnuk Limestone in the McGrath A-5 quadrangle. Since then several additional specimens of Hormospongia labyrinthica have also been collected from a new locality in the Talkeetna C-6 quadrangle in southcentral Alaska (Figs. 1, 2.1), and are documented here.

  5. Bayesian trend analysis in annual rainfall total, duration and maximum in the Kara River basin (West Africa

    Directory of Open Access Journals (Sweden)

    Hèou Maléki Badjana

    2017-10-01

    New hydrological insights for the region: The results indicate that the interannual variability of annRAIN is decreasing over time at all stations, and the average annRAIN is also markedly decreasing at several stations. However, DURATION is increasing at most stations suggesting that in those parts of the basin where annRAIN is decreasing, rainfall occurs more frequently but with less intensity. For MAXAN, evidence for decreasing trend is found in two stations, and for increasing trend in one station. It is also shown that the peak of the rainy season shifted from September to August since the 1980s. Furthermore, changes in the spatio-temporal distribution of the mean decadal rainfall are also observed. This study provides valuable new insights into trends affecting rainfall variables in the Kara River basin.

  6. Qualitative Interpretation Of Aerogravity And Aeromagnetic Survey Data Over The South Western Part Of The Volta River Basin Of Ghana

    Directory of Open Access Journals (Sweden)

    George Hinson

    2015-04-01

    Full Text Available Abstract The study area South western part of Volta River Basin of Ghana covering an area of 8570 km2 which is one-eleventh the area of the Volta River basin of Ghana has been subjected to numerous academic research works but geophysical survey works because of virtual perceptive reasons. It is now believed to overly mineral-rich geological structures hence the use of magnetic and gravity survey methods to bring out these mineral-rich geological structures.Geographically it study area is located at the south western part of the Voltaian basin at latitudes 07o 00 N and 08o 00 N and longitudes 02o 00 W and 01o 00 W respectively. Airborne gravity and magnetic survey methods were employed in the data collection. The field data correction and error reduction were applied to the two raw data on the field after which Geosoft Oasis Montaj 7.01 Encom Profile Analysis P.A 11 and 13 Model Vision 12 and ArcGIS 10.0 were used to process enhance e.g. reduce to pole at low latitude first vertical derivative etc. model the reduced and corrected airborne magnetic data and also to produce maps from them data. Low-to-moderate-to-high gravity and magnetic anomalies were obtained in the complete Bouguer anomaly CBA and total magnetic intensity TMI reduced to pole at low latitude with many of these anomalies trending NE-SW by which the Birimian Metasediments and Metavolcanics can be said to be part of the causative structures of these anomalies with cross-cut NW-SE faults. From the quantitative point of view the intrusive granitic bodies of the study area have a mean depth location of 1.7 km while the isolated anomaly is located at a depth of 1.4 km computed from Euler deconvolution. The NE-SW trending anomalies show the trend direction of their causative structures which are the basement rocks and the basinal intrusive bodies.

  7. Conodont faunas from a complete basinal succession of the upper part of the Wordian (Middle Permian, Guadalupian, West Texas)

    Science.gov (United States)

    Wardlaw, Bruce R.; Nestell, Merlynd K.

    2015-01-01

    In the southern part of the Patterson Hills just to the west of the Guadalupe Mountains escarpment ofWest Texas, a 29m outcrop of alternating calcareous siltstone and silty limestone with a few thin fine sandstone interbeds displays the overlap occurrence of a narrowmorphotype of Jinogondolella nankingensis (herein named J. nankingensis behnkeni) with J. aserrata near its base. The transition of Jinogondolella aserrata to J. postserrata is present near the top of this section and marks theWordian-Capitanian boundary, therefore displaying a significant portion of the upper part of theWordian in one short continuous section. Pseudohindeodus brevis n. sp. and H. capitanensis n. sp. are described. Pseudohindeodus ramovsi, Caenodontus serrulatus, Hindeodus wordensis, Sweetina triticum, Jinogondolella palmata, and J. errata also occur in this succession.

  8. Evaluating LSM-Based Water Budgets Over a West African Basin Assisted with a River Routing Scheme

    Science.gov (United States)

    Getirana, Augusto C. V.; Boone, Aaron; Peugeot, Christophe

    2014-01-01

    Within the framework of the African Monsoon Multidisciplinary Analysis (AMMA) Land Surface Model Intercomparison Project phase 2 (ALMIP-2), this study evaluates the water balance simulated by the Interactions between Soil, Biosphere, and Atmosphere (ISBA) over the upper Oum River basin, in Benin, using a mesoscale river routing scheme (RRS). The RRS is based on the nonlinear Muskingum Cunge method coupled with two linear reservoirs that simulate the time delay of both surface runoff and base flow that are produced by land surface models. On the basis of the evidence of a deep water-table recharge in that region,a reservoir representing the deep-water infiltration (DWI) is introduced. The hydrological processes of the basin are simulated for the 2005-08 AMMA field campaign period during which rainfall and stream flow data were intensively collected over the study area. Optimal RRS parameter sets were determined for three optimization experiments that were performed using daily stream flow at five gauges within the basin. Results demonstrate that the RRS simulates stream flow at all gauges with relative errors varying from -22% to 3% and Nash-Sutcliffe coefficients varying from 0.62 to 0.90. DWI varies from 24% to 67% of the base flow as a function of the sub-basin. The relatively simple reservoir DWI approach is quite robust, and further improvements would likely necessitate more complex solutions (e.g., considering seasonality and soil type in ISBA); thus, such modifications are recommended for future studies. Although the evaluation shows that the simulated stream flows are generally satisfactory, further field investigations are necessary to confirm some of the model assumptions.

  9. A model of collaboration between nursing education institutions in the North West Province of South Africa.

    Science.gov (United States)

    Direko, Kathleen K; Davhana-Maselesele, Mashudu

    2017-09-22

    Professional nursing in South Africa is obtained through a 4-year diploma offered at nursing colleges, or a 4-year degree in universities, and the South African Nursing Council (SANC) registered both for professional nursing. New SANC legislation now requires a bachelor's degree for registration as professional nurse. The aim of the study was to explore and describe perceptions of nurse educators and stakeholders to develop a model of collaboration for joint education and training of nursing professionals by colleges and universities through a bachelor's degree. A mixed methods approach was used to explore perceptions of nurse educators utilising a questionnaire, and perceptions of other nurse training stakeholders through interviews, about a model of collaboration between the college and the university. Themes that emerged from the interviews included identifying collaboration goals, establishing a conducive environment, maximising exchange of resources, role clarification and perceived challenges. Quantitative results showed high agreement percentages (84.13%-100%) on most basic concepts and themes. A model of collaboration was developed indicating a framework, agents, recipients, procedure, dynamics, and terminus. A model of collaboration was acceptable to the majority of nurse education stakeholders. Other implications are that there was a need for the improvement of scholarship among nurse educators and clinical mentors, sharing rare skills, and addressing perceived challenges.

  10. A model of collaboration between nursing education institutions in the North West Province of South Africa

    Directory of Open Access Journals (Sweden)

    Kathleen K. Direko

    2017-02-01

    Full Text Available Background: Professional nursing in South Africa is obtained through a 4-year diploma offered at nursing colleges, or a 4-year degree in universities, and the South African Nursing Council (SANC registered both for professional nursing. New SANC legislation now requires a bachelor’s degree for registration as professional nurse.Objectives: The aim of the study was to explore and describe perceptions of nurse educators and stakeholders to develop a model of collaboration for joint education and training of nursing professionals by colleges and universities through a bachelor’s degree.Method: A mixed methods approach was used to explore perceptions of nurse educators utilising a questionnaire, and perceptions of other nurse training stakeholders through interviews, about a model of collaboration between the college and the university.Results: Themes that emerged from the interviews included identifying collaboration goals, establishing a conducive environment, maximising exchange of resources, role clarification and perceived challenges. Quantitative results showed high agreement percentages (84.13%–100% on most basic concepts and themes. A model of collaboration was developed indicating a framework, agents, recipients, procedure, dynamics, and terminus.Conclusion: A model of collaboration was acceptable to the majority of nurse education stakeholders. Other implications are that there was a need for the improvement of scholarship among nurse educators and clinical mentors, sharing rare skills, and addressing perceived challenges.

  11. Gully morphometry and morphology in the Iyi-Ukwu basin, south ...

    African Journals Online (AJOL)

    This study finally concludes that gullies in the study area were initiated by a combination of steep slopes, high rainfall, soil characteristics, and human activities. Precautionary measures and soft control methods are recommended. Key words: gully erosion, gully classification, morphometry, morphology, Iyi-Ukwu basin ...

  12. Latest Guadalupian (Middle Permian) conodonts and foraminifers from West Texas

    Science.gov (United States)

    Lambert, L.L.; Wardlaw, B.R.; Nestell, M.K.; Nestell, G.P.

    2002-01-01

    Clarkina, which characterizes Upper Permian (Lopingian Series) strata, evolved from Jinogondolella altudaensis in the Delaware basin of West Texas as demonstrated by transitional continuity. The West Texas section is significantly more complete in the uppermost Guadalupian interval than that of the probable GSSP reference section in South China, and clarifies the phylogenetic relationships among other conodont taxa as well. Jinogondolella granti clearly evolved into J. artafrons new species, both characterized by Pa elements with a distinctive fused carina. Representatives of Jinogondolella crofti are limited to the uppermost part of the altudaensis zone, and are interpreted as terminal paedomorphs. The associated foraminifer (non-fusulinid) fauna has some species in common with Zechstein faunas, possibly presaging the evaporitic basin that would develop following this latest Guadalupian marine deposition in West Texas.

  13. Structure of the Karoo-age Ellisras Basin in Limpopo Province, South Africa in the light of new airborne geophysical data

    CSIR Research Space (South Africa)

    Fourie, CJS

    2009-09-01

    Full Text Available The Waterberg Coalfield is destined to become the major source of energy for South Africa in the future. In 2008, Coaltech Research Organisation funded an airborne magnetic and radiometric survey over the Karoo-age Ellisras Basin in which...

  14. The formation of the south-eastern part of the Dniepr-Donets Basin: 2-D forward and reverse syn-rift and post-rift modelling.

    NARCIS (Netherlands)

    Stovba, S.M.; Maystrenko, Yu.; Stephenson, R.A.; Kusznir, N.J.

    2003-01-01

    Forward and reverse modelling of structure and stratigraphy has been used to investigate the syn-rift (Late Devonian) and early post-rift (Carboniferous) evolution of the south-eastern part of the Dniepr-Donets Basin (DDB). Modelling was carried out with and without taking into consideration the

  15. Sediment compaction and pore pressure prediction in deepwater basin of the South China Sea: Estimation from ODP and IODP drilling well data

    Science.gov (United States)

    Xie, Yangbing; Wu, Tuoyu; Sun, Jin; Zhang, Hanyu; Wang, Jiliang; Gao, Jinwei; Chen, Chuanxu

    2018-02-01

    Overpressure in deepwater basins not only causes serious soft sediment deformation, but also significantly affects the safety of drilling operations. Therefore, prediction of overpressure in sediments has become an important task in deepwater oil exploration and development. In this study, we analyze the drilling data from ODP Leg 184 Sites 1144, 1146, and 1148, and IODP Leg 349 Sites U1431, U1432, U1433, and U1435 to study the sediment compaction and controls in the northern South China Sea. Sedimentation rate, sediment content, distribution area, and buried depth are the factors that influence sediment compaction in the deepwater basin of the South China Sea. Among these factors, the sediment content is the most important. The fitted normal compacted coefficients and mudline porosity for an interval of 50 m shows disciplinary variation versus depth. The pore pressure predicted from different fitted results shows varying overpressure situations. The normal compaction trend from Site 1144 reflects the porosity variation trend in stable deposition basins in the northern South China Sea. The predicted pore pressure shows overpressure at Site 1144, which is attributed to compaction disequilibrium. Nevertheless, the mixed lithology column may influence the predicted over-pressure at Site 1148, which is responsible for the confusing result. Above all, we find that sediment compaction should serve as a proxy for pore pressure in the deepwater basin of the South China Sea.

  16. Knowledge and Understanding of the Hydrogeology of the Salt Basin in South-Central New Mexico and Future Study Needs

    Science.gov (United States)

    Huff, G.F.; Chace, D.A.

    2006-01-01

    The Salt Basin covers about 2,400 square miles of south-central New Mexico and extends across the State line into Texas. As much as 57 million acre-feet of ground water may be stored within the New Mexico part of the Salt Basin of which 15 million acre-feet are potentially potable and recoverable. Recent work suggests that the volume of ground water in storage within the New Mexico portion of the Salt Basin may be substantially greater than 57 million acre-feet. In this report, aquifers contained in the San Andres, Bone Spring, and Victorio Peak Limestones and in the Yeso, Hueco, and Abo Formations are collectively referred to as the carbonate aquifer. Porosity and permeability of the major aquifer are primarily determined by the density and interconnectedness of fractures and karstic solution channels. The spatial variability of these fractures and karstic features leads to a large spatial variability in hydraulic properties in the carbonate aquifer. Ground water generally moves southward away from recharge areas along the northern border of the Salt Basin and generally moves eastward to southeastward away from areas of distributed recharge on the Otero Mesa and the Diablo Plateau. Ground water originating from these recharge areas generally moves toward the central valley. Present day discharge is mostly through ground-water withdrawal for agricultural irrigation. A zone of relatively low hydraulic gradient, corresponding to the location of the Otero Break, extends from near the Sacramento River watershed southward toward Dell City, Texas. Ground water in the carbonate aquifer generally is very hard and has dissolved-solids concentrations ranging from 500 to 6,500 milligrams per liter. Substantial variability exists in current estimates of (1) ground-water recharge, (2) natural ground-water discharge, (3) the volume of ground water in storage, (4) the volume of recoverable ground water, (5) the conceptual model of ground-water flow, (6) the distribution of ground

  17. Application of 3D seismic techniques to evaluate ore resources in the West Wits Line goldfield and portions of the West Rand goldfield, South Africa

    CSIR Research Space (South Africa)

    Manzi, MSD

    2012-09-01

    Full Text Available algorithms, therefore significantly increasing the signal-to-noise ratio of the data. In particular, the prestack time migration technique has provided better stratigraphic and structural imaging in complex faulted areas, such as the Witwatersrand basin...

  18. Late Pleistocene glacial stratigraphy of the Kumara-Moana region, West Coast of South Island, New Zealand

    Science.gov (United States)

    Barrows, Timothy T.; Almond, Peter; Rose, Robert; Keith Fifield, L.; Mills, Stephanie C.; Tims, Stephen G.

    2013-08-01

    On the South Island of New Zealand, large piedmont glaciers descended from an ice cap on the Southern Alps onto the coastal plain of the West Coast during the late Pleistocene. The series of moraine belts and outwash plains left by the Taramakau glacier are used as a type section for interpreting the glacial geology and timing of major climatic events of New Zealand and also as a benchmark for comparison with the wider Southern Hemisphere. In this paper we review the chronology of advances by the Taramakau glacier during the last or Otira Glaciation using a combination of exposure dating using the cosmogenic nuclides 10Be and 36Cl, and tephrochronology. We document three distinct glacial maxima, represented by the Loopline, Larrikins and Moana Formations, separated by brief interstadials. We find that the Loopline Formation, originally attributed to Oxygen Isotope Chronozone 4, is much younger than previously thought, with an advance culminating around 24,900 ± 800 yr. The widespread late Pleistocene Kawakawa/Oruanui tephra stratigraphically lies immediately above it. This Formation has the same age previously attributed to the older part of the Larrikins Formation. Dating of the Larrikins Formation demonstrates there is no longer a basis for subdividing it into older and younger phases with an advance lasting about 1000 years between 20,800 ± 500 to 20,000 ± 400 yr. The Moana Formation represents the deposits of the last major advance of ice at 17,300 ± 500 yr and is younger than expected based on limited previous dating. The timing of major piedmont glaciation is restricted to between ˜25,000 and 17,000 yr and this interval corresponds to a time of regionally cold sea surface temperatures, expansion of grasslands at the expense of forest on South Island, and hemisphere wide glaciation.

  19. Chikungunya fever: a clinical and virological investigation of outpatients on Reunion Island, South-West Indian Ocean.

    Science.gov (United States)

    Thiberville, Simon-Djamel; Boisson, Veronique; Gaudart, Jean; Simon, Fabrice; Flahault, Antoine; de Lamballerie, Xavier

    2013-01-01

    Chikungunya virus (CHIKV) is responsible for acute febrile polyarthralgia and, in a proportion of cases, severe complications including chronic arthritis. CHIKV has spread recently in East Africa, South-West Indian Ocean, South-Asia and autochthonous cases have been reported in Europe. Although almost all patients are outpatients, medical investigations mainly focused on hospitalised patients. Here, we detail clinico-biological characteristics of Chikungunya (CHIK) outpatients in Reunion Island (2006). 76 outpatients with febrile arthralgia diagnosed within less than 48 hours were included by general practitioners during the CuraChik clinical trial. CHIK was confirmed in 54 patients and excluded in 22. A detailed clinical and biological follow-up was organised, that included analysis of viral intrahost diversity and telephone survey until day 300. The evolution of acute CHIK included 2 stages: the 'viral stage' (day 1-day 4) was associated with rapid decrease of viraemia and improvement of clinical presentation; the 'convalescent stage' (day 5-day 14) was associated with no detectable viraemia but a slower clinical improvement. Women and elderly had a significantly higher number of arthralgia at inclusion and at day 300. Based on the study clinico-biological dataset, scores for CHIK diagnosis in patients with recent febrile acute polyarthralgia were elaborated using arthralgia on hands and wrists, a minor or absent myalgia and the presence of lymphopenia (<1G/L) as major orientation criteria. Finally, we observed that CHIKV intra-host genetic diversity increased over time and that a higher viral amino-acid complexity at the acute stage was associated with increased number of arthralgia and intensity of sequelae at day 300. This study provided a detailed picture of clinico-biological CHIK evolution at the acute phase of the disease, allowed the elaboration of scores to assist CHIK diagnosis and investigated for the first time the impact of viral intra-host genetic

  20. Mapping of coastal aquifer vulnerable zone in the south west coast of Kanyakumari, South India, using GIS-based DRASTIC model.

    Science.gov (United States)

    Kaliraj, S; Chandrasekar, N; Peter, T Simon; Selvakumar, S; Magesh, N S

    2015-01-01

    The south west coast of Kanyakumari district in Tamil Nadu, India, is significantly affected by seawater intrusion and diffusion of pollutants into the aquifers due to unregulated beach placer mining and other anthropogenic activities. The present study investigates the vulnerability of the coastal aquifers using Geographic Information System (GIS)-based DRASTIC model. The seven DRASTIC parameters have been analyzed using the statistical equation of this model to demarcate the vulnerable zones for aquifer contamination. The vulnerability index map is prepared from the weighted spatial parameters, and an accounting of total index value ranged from 85 to 213. Based on the categorization of vulnerability classes, the high vulnerable zones are found near the beach placer mining areas between Manavalakurichi and Kodimanal coastal stretches. The aquifers associated with settlements and agricultural lands in the middle-eastern part have experienced high vulnerability due to contaminated water bodies. Similarly, the coastal areas of Thengapattinam and Manakudi estuary and around the South Tamaraikulam have also been falling under high vulnerability condition due to backwater and saltpan. In general, the nearshore region except the placer mining zone and the backwater has a moderately vulnerable condition, and the vulnerability index values range from 149 to180. Significantly, the northern and northeastern uplands and some parts of deposition zones in the middle-south coast have been identified as low to no vulnerable conditions. They are structurally controlled by various geological features such as charnockite, garnet biotite gneiss and granites, and sand dunes, respectively. The aquifer vulnerability assessment has been cross-verified by geochemical indicators such as total dissolved solids (TDS), Cl(-), HCO₃(-), and Cl(-)/HCO₃(-) ratio. The high ranges of TDS (1,842--3,736 mg/l) and Cl(-) (1,412--2,112 mg/l) values are well correlated with the observed high

  1. Dense shelf water formation along the south-west Australian inner shelf

    Science.gov (United States)

    Pattiaratchi, Charitha; Hollings, Ben; Woo, Mun; Welhena, Thisara

    2011-05-01

    Hydrological data from a repeated cross-shore transect obtained using Teledyne Webb Research Slocum Electric gliders offshore Two Rocks in south-western Australia over 13 months are presented. The data revealed that formation of dense water inshore and its transport across the shelf as a near bed gravity current (defined as Dense Shelf Water Cascade, DSWC) was a regular occurrence, particularly during autumn and winter months. In autumn, the dense water is mainly formed through changes in salinity resulting from evaporation, whilst in winter; temperature change through surface cooling was the dominant factor. The mean wind speeds also decrease during the transition during autumn. The speed of the DSWC was estimated to be 0.01-0.02 m s-1, and similar to that measured in other selected regions globally. The offshore transport from the shelf is a significant component of the alongshore wind-driven transport.

  2. Rural-urban differentials of premature mortality burden in south-west China

    Directory of Open Access Journals (Sweden)

    Chongsuvivatwong Virasakdi

    2006-10-01

    Full Text Available Abstract Background Yunnan province is located in south western China and is one of the poorest provinces of the country. This study examines the premature mortality burden from common causes of deaths among an urban region, suburban region and rural region of Kunming, the capital of Yunnan. Methods Years of life lost (YLL rate per 1,000 and mortality rate per 100,000 were calculated from medical death certificates in 2003 and broken down by cause of death, age and gender among urban, suburban and rural regions. YLL was calculated without age-weighting and discounting rate. Rates were age-adjusted to the combined population of three regions. However, 3% discounting rate and a standard age-weighting function were included in the sensitivity analysis. Results Non-communicable diseases contributed the most YLL in all three regions. The rural region had about 50% higher premature mortality burden compared to the other two regions. YLL from infectious diseases and perinatal problems was still a major problem in the rural region. Among non-communicable diseases, YLL from stroke was the highest in the urban/suburban regions; COPD followed as the second and was the highest in the rural region. Mortality burden from injuries was however higher in the rural region than the other two regions, especially for men. Self-inflicted injuries were between 2–8 times more serious among women. The use of either mortality rate or YLL gives a similar conclusion regarding the order of priority. Reanalysis with age-weighting and 3% discounting rate gave similar results. Conclusion Urban south western China has already engaged in epidemiological pattern of developed countries. The rural region is additionally burdened by diseases of poverty and injury on top of the non-communicable diseases.

  3. Tectonic-depositional environment and proto-type basins evolution of the Late Ordovician in the Tarim Basin

    Science.gov (United States)

    Gao, Huahua; He, Dengfa; Tong, Xiaoguang; Wen, Zhixin; Wang, Zhaoming

    2017-04-01

    The tectonic-depositional environment of the Tarim Basin underwent a rapid and dramatic change in the Late Ordovician. The restoration of the proto-type basins has a great significance for the reveal of the basin-mountain coupling and basin fill process. Based on the newest data of drillings, seismic profiles and outcrops, with the analysis of sedimentary facies and the combination of basins and orogenic belts, this paper reconstructed the Late Ordovician tectonic-depositional environment of the Tarim Basin and established the models of basin-mountain couplings and basin fill processes, by employing the method of "point → line → face". In the Tumuxiuke Formation stage, the inundated platform-deep water basin sedimentary system was developed in the western part of the Tarim Basin and the Bachu-Tazhong area was denudated ; In the Lianglitage Formation stage, the open platform-deep water basin sedimentary system was developed and the Yudong-Tanggubasi area underwent the transition from the carbonate basin to the turbidite basin; in the Sangtamu Formation stage, the mixed shelf deposit- turbidite basin sedimentary system was developed and the under-filling deposit was only developed in the Kalpin; In the Tierekeawati Formation stage, the shore-shelf sedimentary system was developed. In the Tumuxiuke Formation- Sangtamu Formation stages, the turbidite basin sedimentary system was continually developed in the eastern part of the Tarim Basin; In the Tierekeawati Formation stage, the clastic shelf sedimentary system was developed in this area. The tectonic-depositional pattern of Tarim Basin in the Late Ordovician had the feature as the following: the platform-basin pattern differentiated from east to west was overlaid with the uplift-depression pattern differentiated from north to south. In the Tumuxiuke Formation stage, the unified platform in the west of the basin had broken down leading to the development of uplift-depression pattern differentiated from north to

  4. Governance and politics in the upper Limpopo River Basin, South Africa

    CSIR Research Space (South Africa)

    Meissner, Richard

    2015-10-01

    Full Text Available Everyday international political economy (EIPE) offers an opportunity to rethink the role of individuals and citizenry in shaping governance of natural resources. In South Africa, significant progress has been made by government in re-shaping water...

  5. Physical characteristics of stream subbasins in the Hawk Creek-Yellow Medicine River basin, southwestern Minnesota and eastern South Dakota

    Science.gov (United States)

    Sanocki, Christopher A.

    1996-01-01

    Data that describe the physical characteristics of stream subbasins upstream from selected sites on streams in the Hawk Creek-Yellow Medicine River Basin, located in southwestern Minnesota and eastern South Dakota are presented in this report. The physical characteristics are the drainage area of the subbasin, the percentage area of the subbasin covered only by lakes, the percentage area of the subbasin covered by both lakes and wetlands, the main-channel length, and the main-channel slope. Stream sites include outlets of subbasins of at least 5 square miles, outlets of sewage treatment plants, and locations of U.S. Geological Survey low-flow, high-flow, and continuous-record gaging stations.

  6. Physical characteristics of stream subbasins in the Lac qui Parle River basin, southwestern Minnesota and eastern South Dakota

    Science.gov (United States)

    Lorenz, D.L.; Sanocki, C.A.; Winterstein, Thomas A.

    1994-01-01

    Data describing the physical characteristics of stream subbasins upstream from selected points on streams in the Lac qui Parle River basin, located in southwestern Minnesota and eastern South Dakota, are presented in this report. The physical charac- teristics are the drainage area of the subbasin, the percentage area of the subbasin covered only by lakes, the percentage area of the subbasin covered by both lakes and wetlands, the main-channel length. and the main-channel slope. The points on the stream include outlets of subbasins of at least 5 square miles, outfalls of sewage treatment plants, and locations of U.S. Geological Survey low-flow, high-flow, and continuous-record gaging stations.

  7. Early Diagenesis Records and Pore Water Composition of Methane-Seep Sediments from the Southeast Hainan Basin, South China Sea

    Directory of Open Access Journals (Sweden)

    Daidai Wu

    2011-01-01

    Full Text Available Several authigenic minerals were identified by XRD and SEM analyses in shallow sediments from the Southeast Hainan Basin, on the northern slope of South China Sea. These minerals include miscellaneous carbonates, sulphates, and framboidal pyrite, and this mineral assemblage indicates the existence of gas hydrates and a methane seep. The assemblage and fabric features of the minerals are similar to those identified in cold-seep sediments, which are thought to be related to microorganisms fostered by dissolved methane. Chemical composition of pore water shows that the concentrations of SO42-, Ca2+, Mg2+, and Sr2+ decrease clearly, and the ratios of Mg2+ to Ca2+ and Sr2+ to Ca2+ increase sharply with depth. These geochemical properties are similar to those where gas hydrates occur in the world. All results seem to indicate clearly the presence of gas hydrates or deep water oil (gas reservoirs underneath the seafloor.

  8. Starch Product of Wild Plants Species Jalawure (Tacca leontopetaloides L.) Kuntze as The Source of Food Security in The South Coastal West Java

    Science.gov (United States)

    Wardah; Sambas, E. N.; Ridwan; Ariani, D.

    2017-04-01

    Majority of people of South coast of West Java, from Sukabumi, Cianjur, Garut are fishermen. Natural conditions are very dry and the area of land for agriculture, particularly rice cultivation is minimal. So that the condition of the society is more directed to high enough levels of food insecurity. Because coastal areas tend to have a longer dry season from rainfall. Results of research conducted in the years 2013 - 2016 in the area of Pelabuhan Ratu, Cidaun (Cianjur), Coastal area of Jayanti, Ranca Buaya, Mekar Mukti, and along the coast until Pameungpeuk, Leuweung Sancang, is known that jalawure plant which grows wild at South-coast region of West Java is precisely the alternative solution to address food insecurity. The results of the starch flour is a source of carbohydrate that is high enough to be used as a substitute for rice and wheat. Another potential source of jalawure nutrition is also recommended for diabetics consumption.

  9. Geologic Controls of Hydrocarbon Occurrence in the Southern Appalachian Basin in Eastern Tennessee, Southwestern Virginia, Eastern Kentucky, and Southern West Virginia

    Energy Technology Data Exchange (ETDEWEB)

    Robert D. Hatcher

    2004-05-31

    This report summarizes the second-year accomplishments of a three-year program to investigate the geologic controls of hydrocarbon occurrence in the southern Appalachian basin in eastern Tennessee, southwestern Virginia, eastern Kentucky, and southern West Virginia. The project: (1) employs the petroleum system approach to understand the geologic controls of hydrocarbons; (2) attempts to characterize the T-P parameters driving petroleum evolution; (3) attempts to obtain more quantitative definitions of reservoir architecture and identify new traps; (4) is working with USGS and industry partners to develop new play concepts and geophysical log standards for subsurface correlation; and (5) is geochemically characterizing the hydrocarbons (cooperatively with USGS). Second-year results include: All current milestones have been met and other components of the project have been functioning in parallel toward satisfaction of year-3 milestones. We also have been effecting the ultimate goal of the project in the dissemination of information through presentations at professional meetings, convening a major workshop in August 2003, and the publication of results. Our work in geophysical log correlation in the Middle Ordovician units is bearing fruit in recognition that the criteria developed locally in Tennessee and southern Kentucky have much greater extensibility than anticipated earlier. We have identified a major 60 mi-long structure in the western part of the Valley and Ridge thrust belt that is generating considerable exploration interest. If this structure is productive, it will be one of the largest structures in the Appalachians. We are completing a more quantitative structural reconstruction of the Valley and Ridge than has been made before. This should yield major dividends in future exploration in the southern Appalachian basin. Our work in mapping, retrodeformation, and modeling of the Sevier basin is a major component of the understanding of the Ordovician

  10. Management of root diseases of annual pasture legumes in Mediterranean ecosystems - a case study of subterranean clover root diseases in the south-west of Western Australia

    Directory of Open Access Journals (Sweden)

    M. Barbetti

    2007-12-01

    Full Text Available Subterranean clover (Trifolium subterraneum is an important component of Mediterranean dryland pasture ecosystems, such as in the south-west of Western Australia, where it is utilised as a winter annual pasture that provides nitrogen as well as disease breaks for rotational crops. Necrotrophic soil-borne fungal pathogens dominate Mediterranean ecosystems because of the ease of survival of these pathogens on infested residues over the dry summer period, and because of low levels of microbial competition in the impoverished and nutrient-defi cient soils characteristic of these regions that predisposes plants to root diseases. In addition to herbage and seed yield losses from soil-borne fungal and nematode pathogens, changes in botanical composition, in the number of regenerating plants, their persistence, and factors affecting feed quality are signifi cantly affected. Further, where the causal organisms of the diseases on subterranean clover are also common on other rotational crops, the impact of these soilborne pathogens appears far wider in Mediterranean ecosystems than previously considered. Under these conditions, soil-borne pathogens pose a serious threat to the productivity of this self-seeding pasture legume, to the extent that reseeding may become necessary. Pathogens such as Phytophthora clandestina, various Pythium species particularly Pythium irregulare, Aphanomyces sp., Rhizoctonia solani, one or more Fusarium species, Phoma medicaginis and Cylindrocarpon didymium are of concern, as are the nematode parasites from the genera Meloidogyne, Heterodera, Pratylenchus, Trichodorus and Radopholus. In this ecosystem, root pathogens operate together as disease complexes and the challenge therefore has been to source host genotypes with resistance to multiple pathogens. In addition to plant nutrition, environmental factors, in particular rainfall (soil moisture and soil temperature, have a marked effect on both the disease severity caused by

  11. Determination of the source area of the Ya13-1 gas pool in the Qiongdongnan Basin, South China Sea

    Energy Technology Data Exchange (ETDEWEB)

    Xiao, X.M.; Xiong, M.; Tian, H. [Chinese Academy of Sciences, Guangzhou (China). Institute of Geochemistry; Wilkins, R.W.T. [CSIRO Petroleum, North Ryde (Australia); Huang, B.J. [CNOOC Ltd., Zhanjiang (China). Technology Dept.; Tang, Y.C. [California Institute of Technology, Walnut, CA (United States). Petroleum Energy and Environmental Research Center

    2006-09-15

    The Yal3-l gas field is the largest and earliest commercial gas field discovered in the Qiongdongnan Basin, South China Sea. Recent work has indicated the gas source to be a series of black mudstones in the Yacheng Formation of Eocene-Oligocene age in the Yanan Depression, Qiongdongnan Basin. However, there are no data indicating the effective source area. In this paper, methane generation kinetics and carbon isotopic fractionation kinetics were combined with fluid inclusion data to investigate the effective source area and gas migration and accumulation efficiency. Fluid inclusions from the gas reservoir rocks homogenize in the range of 118-173 degrees C. By combining the fluid inclusion data with the thermal history of the reservoir, the filling of the gas pool is deduced to have occurred from 2 Mabp to present. The results from geological models of gas generation and methane carbon isotopic fractionation of the source rock vary widely from the depression center to the position of the structure. The source rock has a methane fractional conversion ranging from 0.10 to 1.0, and the generated gas has predicted ({sup 13}C{sub 1} values in the range from -26.0 per 1000 to -42.0 per 1000. Compared with the ({sup 13}C{sub 1} values of gas from the gas pool, these models indicate that an effective gas source rock area is located in the slope area of the Yanan Depression, with a present burial depth of 4000-5500 m. On this basis, a model showing the gas generation, migration and accumulation for the Ya13-1 gas pool is proposed. It is believed that the methods and the models developed in this paper are important guides to further research and exploration for natural gases in the Yinggehai-Qiongdongnan Basin. (Author)

  12. Characterization of gas hydrate distribution using conventional 3D seismic data in the Pearl River Mouth Basin, South China Sea

    Science.gov (United States)

    Wang, Xiujuan; Qiang, Jin; Collett, Timothy S.; Shi, Hesheng; Yang, Shengxiong; Yan, Chengzhi; Li, Yuanping; Wang, Zhenzhen; Chen, Duanxin

    2016-01-01

    A new 3D seismic reflection data volume acquired in 2012 has allowed for the detailed mapping and characterization of gas hydrate distribution in the Pearl River Mouth Basin in the South China Sea. Previous studies of core and logging data showed that gas hydrate occurrence at high concentrations is controlled by the presence of relatively coarse-grained sediment and the upward migration of thermogenic gas from the deeper sediment section into the overlying gas hydrate stability zone (BGHSZ); however, the spatial distribution of the gas hydrate remains poorly defined. We used a constrained sparse spike inversion technique to generate acoustic-impedance images of the hydrate-bearing sedimentary section from the newly acquired 3D seismic data volume. High-amplitude reflections just above the bottom-simulating reflectors (BSRs) were interpreted to be associated with the accumulation of gas hydrate with elevated saturations. Enhanced seismic reflections below the BSRs were interpreted to indicate the presence of free gas. The base of the BGHSZ was established using the occurrence of BSRs. In areas absent of well-developed BSRs, the BGHSZ was calculated from a model using the inverted P-wave velocity and subsurface temperature data. Seismic attributes were also extracted along the BGHSZ that indicate variations reservoir properties and inferred hydrocarbon accumulations at each site. Gas hydrate saturations estimated from the inversion of acoustic impedance of conventional 3D seismic data, along with well-log-derived rock-physics models were also used to estimate gas hydrate saturations. Our analysis determined that the gas hydrate petroleum system varies significantly across the Pearl River Mouth Basin and that variability in sedimentary properties as a product of depositional processes and the upward migration of gas from deeper thermogenic sources control the distribution of gas hydrates in this basin.

  13. HEPATITIS B VIRUS (HBV AND SYPHILIS CO-INFECTIONS AMONG THE PEOPLE OF EKITI, SOUTH-WEST, NIGERIA

    Directory of Open Access Journals (Sweden)

    Akinbolaji Thompson J, Odeyemi Festus A, Adegeye Festus O, Ojo Olalekan I, Akinseye Funmilayo J.

    2015-04-01

    Full Text Available This study was carried out to know the prevalence of hepatitis B, syphilis and co-infection of both among the people of Ekiti, South-West, Nigeria. Individuals and patients who visited the Haematology and Blood Transfusion Unit of Ekiti State University Teaching Hospital, Ado-Ekiti to screen themselves for HBV and Syphilis infections between January to November, 2014 were recruited for this study having obtained their consent. 4ml of blood sample was collected from each subject into a plain bottle and was allowed to stand for 1hour for clotting and clot retraction to take place. Sera were separated into khan tubes labeled appropriately and were screened for the presence of antibodies to HVB and syphilis using One-Stage Rapid Test Kits (DiaSpot Diagnostics and were later confirmed using enzyme linked immune sorbent assay (ELISA (Stat Fax Awareness, England. One Thousand Six Hundred and Thirty-Nine subjects were recruited for this study, out of which Seven Hundred and Seventy-Four were males while Eight Hundred and Sixty-Five were females. 101(6.16% were positive to HBV, 51(0.92% positive to syphilis and 5(0.31% were co-infected with both infections. The results of this study showed higher prevalence of hepatitis B infection than syphilis infection with the highest prevalence found within the age group 31-40 years and 21-30 years indicating that most of the infected people got the infection through sexual intercourse.

  14. Characterisation and Comparison of Aliphatic Hydrocarbons Extracted from Different Mangrove Species in Cochin estuary (South West Coast of India)

    Science.gov (United States)

    Moolakkal Antony, R.

    2016-02-01

    The samples are collected from Malippuram (10.020 N, 76.210 E), Cochin estuary (South West Coast of India). The area contains various mangrove species, in which we have collected 4 common species (Acanthus Ilicifolis, Avicennia Marina, Avcennia Officianalis and Acrosticum Aurum) among the dominant species in the area. The leaves of these collected samples were freeze dried, grinded and extracted with solvents using standard protocols. The organic layer separated is used for analysing hydrocarbon (n-alkanes and n-alkenes) using Column Chromatography. Recent study (Gireeshkumar et al., 2015) revealed that, long-chain n-alkanes derived from higher plants predominated the inner part of the estuary, while short-chain n-alkanes derived from planktonic sources predominated the bar mouth region. Mangroves are one among the world's most productive ecosystem and form an important part of the coastal and estuarine environment. Living at the interface between land and sea, the mangrove plants have morphological and physiological adaptations to survive in harsh saline environment. Mangroves produce organic carbon well in excess of the ecosystem requirement and contribute significantly to global carbon cycle. They have enormous ecological value. This is the first report of n-alkanes and n-alkenes from these major species in the study area. The qualitative aspects of this study completed and the quantitative aspect is in progress. The stem and root of the collected samples are preserved for future extraction studies.

  15. Sustainability Factor Related with the Implementation of Community Mental Health Nursing (CMHN in South and West Jakarta

    Directory of Open Access Journals (Sweden)

    Esti Winahayu

    2016-09-01

    Full Text Available The aim of this study was to determine the sustainability factor related with the implementation of CMHN in South and West Jakarta. The method of the study was cross sectional, data of the nurses was collected by questionnaire of CMHN and pearson correlation was used to analyzed the data. Interviews conducted on stakeholder to get stakeholder perceptions about the sustainability factor of CMHN. The ability of nurse in the implementation of CMHN is 45,86%. The nurse perception toward sustainability factor of CMHN is 67,49%. The result of study shows the significant relationship between the sustainability factor with the implementation of CMHN. The result of analysis interviews with stakeholder about 8 sustainability factors is obtained into several themes: the positive opinion of stakeholder toward the CMHN (the existence of nursing care to the patients, detecting of new case, and reducing stigma and the effort for the sustainability of CMHN (increasing the perception, budget planning, and socialization. The result of the study is recomended to improve the community mental health nursing service in other region. Keywords: CMHN nurses, stakeholder, sustainability, the implementation of CMHN

  16. Human Mycobacterium bovis infection in the south-west of Ireland 1983-1992: a comparison with M. tuberculosis.

    LENUS (Irish Health Repository)

    Cotter, T P

    2012-02-03

    Epidemiological and bacteriological aspects of human Mycobacterium bovis disease were investigated in south-west Ireland (counties Cork & Kerry, population 536,000) over the years 1983-92 inclusive and compared to M. tuberculosis. Results showed a small, stable incidence of culture positive M. bovis human disease, mean annual incidence 0.56 per 100,000 population compared to a higher but declining incidence of culture positive M. tuberculosis (15.3 per 100,000 in 1983, 9.0 per 100,000 in 1992). Male patients were the majority, 63.4 per cent of M. bovis; 62.4% of M. tuberculosis (p = 0.03). Fifty three per cent of M. bovis cases (n = 30) were pulmonary, compared to 85% of M. tuberculosis (n = 626; p = 0.0001). M. bovis patients were older (p = 0.02), mean age 58.4 years (SD 18.9) compared to 48.5 (SD 22.2). The mycobacterial smear positive rate was similar in both groups taken as a whole. No rural-urban difference in incidence was found in either disease, suggesting in the case of M. bovis initial infection in childhood via contaminated milk in the pre-pasteurisation era.

  17. Seamount influences on mid-water shrimps (Decapoda) and gnathophausiids (Lophogastridea) of the South-West Indian Ridge

    Science.gov (United States)

    Letessier, Tom B.; De Grave, Sammy; Boersch-Supan, Philipp H.; Kemp, Kirsty M.; Brierley, Andrew S.; Rogers, Alex D.

    2017-02-01

    Maintenance of often-observed elevated levels of pelagic diversity and biomass on seamounts, of relevance to conservation and fishery management, involves complex interactions between physical and biological variables that remain poorly understood. To untangle these biophysical processes we explore factors influencing the distribution of epi- and meso-pelagic (0-1000 m) micronektonic crustaceans (>15 mm; order Lophogastridea, family Gnathophausiidea; and order Decapoda) on and off seamounts along the South West Indian Ridge (SWIR, 27° to 42°S) and on a seamount off the Madagascar Ridge (31.6°S, 42.8°E). Thirty-one species of micronektic crustaceans were caught using mid-water trawls within the study area but there was no apparent latitude-related patterns in species richness or abundance. Species richness predicted by rarefraction curves and numerical abundance was highest in the vicinity (800 m). The dominant species assemblage comprised the shrimps Systellaspis debilis (37%) and Sergia prehensilis (34%), and was restricted to seamounts on the subtropical SWIR. Our observations suggest that the 'oasis effect' of seamounts conventionally associated with higher trophic levels is also applicable to pelagic micronektic crustaceans at lower trophic levels. We suggest that the enhanced biomass and species richness attributed is due to 'habitat enrichment', whereby seamounts provide favourable habitats for both pelagic and bentho-pelagic mid-water crustaceans.

  18. Postmortem evidence of interactions of bottlenose dolphins (Tursiops truncatus) with other dolphin species in south-west England.

    Science.gov (United States)

    Barnett, J; Davison, N; Deaville, R; Monies, R; Loveridge, J; Tregenza, N; Jepson, P D

    2009-10-10

    Reports of violent interactions between bottlenose dolphins (Tursiops truncatus) and harbour porpoises (Phocoena phocoena) in the coastal waters of the UK are well documented. Examination of stranded cetaceans by the Cornwall Wildlife Trust Marine Strandings Network and the UK Cetacean Strandings Investigation Programme has indicated that seven animals, of four other species, found stranded in south-west England, had pathology consistent with bottlenose dolphin interaction, including two juvenile and two adult common dolphins (Delphinus delphis), one juvenile pilot whale (Globicephala melas), one juvenile Risso's dolphin (Grampus griseus) and one adult striped dolphin (Stenella coeruleoalba). Although recorded traumatic lesions were often not as severe as those found in harbour porpoises, it is probable that the interactions did contribute to stranding and/or death in all four of the juvenile animals examined. Furthermore, analysis of photographs taken before establishment of the Marine Strandings Network revealed rake (teeth) marks consistent with bottlenose dolphin interaction on one stranded common dolphin in 1992. A number of causes have been suggested for these interactions in harbour porpoises stranded in the UK and it is possible that any combination of these factors may also be implicated in the cases described in this report.

  19. Raising livestock in resource-poor communities of the North West Province of South Africa - a participatory rural appraisal study

    Directory of Open Access Journals (Sweden)

    J.K. Getchell

    2002-07-01

    Full Text Available A participatory research model was used in six village communities in the Central Region of the North West Province of South Africa in order to achieve the following broad objectives : to obtain information on the challenges owners face in raising livestock in these areas and to evaluate the livestock owners' level of knowledge of internal parasites in their animals. Information obtained at participatory workshops clearly indicated a need for improvements in water supply, schools, job creation, and health services. Lack of pasture for grazing livestock was also cited as being important. Other most frequently mentioned livestock problems included 'gall sickness' (a vaguely defined condition not necessarily referring to anaplasmosis, parasites (both external and internal, chicken diseases and ingestion of plastic bags discarded in the environment. When livestock owners were questioned during individual interviews, most were able to identify the presence of parasites in either the live or dead animal. However, it seems likely that this is limited to the identification of tapeworms. It was found that most livestock owners use a combination of treatments, ranging from traditional to folklore to commercial. There were some difficulties in using the participatory methods since it was the first time that the facilitators and the communities had been exposed to them. Many communities had difficulty in dealing with the concept of finding solutions within the community, which is such an integral part of participatory methods.

  20. Thermus tengchongensis sp. nov., isolated from a geothermally heated soil sample in Tengchong, Yunnan, south-west China.

    Science.gov (United States)

    Yu, Tian-Tian; Yao, Ji-Cheng; Ming, Hong; Yin, Yi-Rui; Zhou, En-Min; Liu, Min-Jiao; Tang, Shu-Kun; Li, Wen-Jun

    2013-03-01

    A Gram-stain negative aerobic bacterium, designated YIM 77924(T), was isolated from a geothermally heated soil sample collected at Rehai National Park, Tengchong, Yunnan province, south-west China. Growth was found to occur from 55 to 75 °C (optimum 65 °C), pH 6.0-8.0 (optimum pH 7.0) and 0-1 % NaCl (w/v). Cells were observed to be rod-shaped and the colonies convex, circular, smooth, yellow and non-transparent. Phylogenetic analysis based on the 16S rRNA gene sequence indicated that strain YIM 77924(T) belongs to the genus Thermus. The 16S rRNA gene sequence similarity values between strain YIM 77924(T) and other species of the genus Thermus were all below 97 %. The polar lipids of strain YIM 77924(T) were determined to be aminophospholipid, phospholipid and glycolipid. The predominant respiratory quinone was determined to be MK-8 and the G+C content was 66.64 mol%. The major fatty acids identified were iso-C(16:0), iso-C(15:0), iso-C(17:0) and C(16:0). On the basis of the morphological and chemotaxonomic characteristics as well as genotypic data, strain YIM 77924(T) is proposed to represent a novel species, Thermus tengchongensis sp. nov., in the genus Thermus. The type strain is YIM 77924(T) (=KCTC 32025(T) = CCTCC AB2012063(T)).

  1. An exploration of issues of management and intention to stay: allied health professionals in South West Victoria, Australia.

    Science.gov (United States)

    Stagnitti, Karen; Schoo, Adrian; Dunbar, James; Reid, Catherine

    2006-01-01

    Management of allied health staff and services often has implications for staff stability and retention. A survey of allied health staff in South West Victoria was conducted in 2003 to explore issues relating to recruitment and retention. Findings relating to management and retention of staff in their current job are addressed in this report. A total of 138 staff returned their questionnaires. Results were related to Maslow's hierarchy of needs, level of belonging, with professional needs identified as feeling supported, orientation to the position, clear job description, and able to recommend the position to others. Qualitative data showed that recommending the position was associated with job satisfaction, autonomy, flexibility, and variety of work. The immediate management structure was significantly related to retention. Reasons given for intending to leave were related to management categories. These were management structure, lack of career structure, and lack of professional support. Reasons given by respondents for not recommending their current position were as follows: not for long-term career, risk of deskilling if staying too long, and financially unrewarding. These reasons were also related to management. Positive reasons for staying, which were related to management, included flexible work conditions, variety of clinical and management experience, good working environment, good support, and autonomy. Recommendations are given for organizational development and training for managers.

  2. Parasitic prevalences in fresh water prawn Macrobrachium rosenbergii in north and south 24 Parganas districts of West Bengal

    Directory of Open Access Journals (Sweden)

    Monjit Paul

    2010-01-01

    Full Text Available The occurrence of different freshwater prawn (Macrobrachium rosenbergii parasites, found during the period from April to August 2007, was investigated in different freshwater wetlands of north and south 24 Parganas districts of West Bengal state in India. Eleven parasites - Zoothamnium, Epistylis, Gregarina, Amphileptus, Dileptus, Myxobolus, Chilodonella, Balladyna, Gozia, Rhabdochona, Indocucullanus, Procamallanus and Cucullanus - were found after examining 1,000 specimens of Macrobrachium rosenbergii of different-sized groups. The highest prevalence of the parasites was recorded in the size group of 81-85 mm and 136-140 mm. The intensity of ectoparasitic infection was observed to be high with an increase in size. The gills and the surface of the body were mostly infected. Endoparasites were found in the intestinal part, and mostly due to poor raw foods given to the prawns as their diets. The parasites get more shelter and space for them. The highest intensity of those parasites was found in the month of August due to favourable autumnal conditions, with little rain and favourable breeding time of the parasites. Stressed and weak prawns are more vulnerable to infestation under adverse environmental conditions.

  3. Prevalence of severe mental distress and its correlates in a population-based study in rural south-west Uganda

    Directory of Open Access Journals (Sweden)

    Baisley Kathy

    2011-06-01

    Full Text Available Abstract Background The problem of severe mental distress (SMD in sub-Saharan Africa is difficult to investigate given that a substantial proportion of patients with SMD never access formal health care. This study set out to investigate SMD and it's associated factors in a rural population-based cohort in south-west Uganda. Methods 6,663 respondents aged 13 years and above in a general population cohort in southwestern Uganda were screened for probable SMD and possible associated factors. Results 0.9% screened positive for probable SMD. The factors significantly associated with SMD included older age, male sex, low socio-economic status, being a current smoker, having multiple or no sexual partners in the past year, reported epilepsy and consulting a traditional healer. Conclusion SMD in this study was associated with both socio-demographic and behavioural factors. The association between SMD and high risk sexual behaviour calls for the integration of HIV prevention in mental health care programmes in high HIV prevalence settings.

  4. The incidence of feco-oral parasites in street-food vendors in Buea, south-west region Cameroon.

    Science.gov (United States)

    Assob, J C N; Nde, P F; Nsagha, D S; Njimoh, D L; Nfor, O; Njunda, A L; Kamga, H L F

    2012-09-01

    The street-food industry lacks legal recognition, it operates in unstable and precarious conditions, involving women and men with minimal or no knowledge of hygienic food handling practices. Infective eggs, bacteria, toxins and cysts of faecal orally transmissible parasites are common agents responsible for food contamination in developing countries. To determine the incidence of digestive faecal-oral parasites among street-food vendors in Buea, South-west region of Cameroon, From March to May 2009, physical and laboratory analysis of stool samples of 150 randomly selected street-food vendors, residing in four different zones in the municipality were carried out. Information on environmental and personal hygiene was also collected. Results revealed that 56.7% of the sampled population was infected with faecal-oral parasites. The major faecal-oral parasites detected in stool samples were: Entamoeba coli (14.0%), Entamoeba histolytica (12.67%), Ascaris lumbricoides (11.33%), Ankylostoma duodenalis (10.67%). Childcare activities, lack of deworming, poor personal hygiene, poor sanitary and toilet facilities, were factors promoting the spread of faecal-oral infections. Food vendors should be educated on personal hygiene and safe food handling measures. Regulatory procedures on environmental hygiene and regular medical and paramedical follow up of food vendors should be enforced.

  5. Motor neurone disease in Lancashire and South Cumbria in North West England and an 8 year experience with enteral nutrition.

    Science.gov (United States)

    Chhetri, Suresh Kumar; Bradley, Belinda Fay; Majeed, Tahir; Lea, Robert William

    2016-02-01

    Motor neurone disease (MND) is a fatal neurodegenerative disease of unknown aetiology. Malnutrition is a common occurrence and an independent risk factor for worse prognosis. However, it remains unclear whether provision of enteral nutrition (EN) through a gastrostomy tube offers any survival advantage. Our aim was to describe the demographic and clinical characteristics of MND in Lancashire and South Cumbria in North West England and the impact of EN on survival in the 8 year period of 2005-2012. Four hundred and seven patients with MND were identified through the Preston MND care and research centre registry giving a crude incidence rate of 3.15/100,000. Three hundred and forty patients with adequate information were included in the final analysis of whom 53.2% were male. The presentation was limb/spinal in 62.1% and bulbar in 37.9% of patients, bulbar onset being more common in elderly females. Mean age of onset was 67.28 years (standard deviation 11.06; range 22.78-93.06). Median survival was 1.98 years (range 1.18-3.05). Ninety-one patients received EN of whom 67% had bulbar onset disease. EN was not associated with a statistically significant survival advantage except for the subgroup who received EN more than 500 days after symptom onset. In conclusion, the early requirement for EN may indicate a prognostically less favourable subgroup. Copyright © 2015 Elsevier Ltd. All rights reserved.

  6. HYDROCHEMICAL FEATURES AND THE WATER QUALITY OF THE FLUVIAL LAKES FROM THE SOUTHWEST OF DOBRUDJA

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    Camelia Eliza (TELTEU PĂSCULESCU

    2010-11-01

    Full Text Available Hydrochemical features and the water quality of the fluvial lakes from the southwest of Dobrudja. The evidence of the hydrochemical features and the water quality of the fluvial lakes is based on the processing of data concerning chemical parameters for the years 1996 – 2008. The values of the chemical parameters have been analysed and fit according to the Order 161/2006. The ionic composition of the fluvial lakes ranged between 412.2 mg/L – 928.17 mg/L and is characterized almost 65% by prevailing of the bicarbonate anion. The magnesium ion (38.32 mg/l – 4.76 mg/l contributes to the mineralization of the water with great values compared to the values of the calcium ion (37.20 mg/l – 31.83 mg/l. But the concentration of chlorine (50.76 – 148.25 mg/l and sulfate (40.15 – 95.41 mg/l anions is higher than magnesium and calcium cations. The mean values of the dissolved oxygen ranged between 7.32 mg O2/l and 9.78 mg O2/l. The potential for hydrogen ion concentration has values between 7.8 and 8.5 so the fluvial lakes are alkaline and are favorable for the growth of animal and vegetable organisms. These fluvial lakes have fresh water and they are used in pisciculture.