WorldWideScience

Sample records for terraces

  1. Terrace Town

    Science.gov (United States)

    Sabin, Heather

    2010-01-01

    The "Terrace Town" program brings architecture and city planning curriculum to elementary schools in Madison, Wisconsin, and surrounding areas. Over eight weeks, classrooms discuss what makes a community livable, sustainable, and kid-friendly. Throughout the process, students gain a better understanding of their own city environments and…

  2. Staking Terraces Online: A Terrace Layout Program

    Science.gov (United States)

    Terrace construction in Missouri exceeded 3 million feet at a cost of over $8 million in 2008. Up to 50 % of the total construction and design time is spent on the terrace layout itself. A web-based computer program, MOTERR, has been developed to design terrace layouts. The program utilizes digital ...

  3. Terraces and contour farming

    Science.gov (United States)

    Terraces are earthen embankments constructed across the prevailing field land slope. They have been used in differing forms for thousands of years in an attempt to protect steep land slopes from runoff induced erosion. Contour farming, where tillage and planting create ridges and furrows at nearly...

  4. The cafeteria terrace

    CERN Multimedia

    1987-01-01

    The large terrace area outside Restaurant 1 at CERN is a hive of activity in the summer. Visitors and staff members meet here for breaks from work. Often the air is filled with discussion in many different accents and languages on topics from theoretical physics to the weekend's activities.

  5. Galveston Bay Marsh Terracing 2001-2002

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — Marsh terracing is used to restore coastal wetlands by converting shallow nonvegetated bottom to intertidal marsh. Terraces are constructed from excavated bottom...

  6. CERN gets a new terrace

    CERN Multimedia

    Laëtitia Pedroso

    2010-01-01

    For the last few days, people working on the CERN site have been able to take advantage of the new terrace to relax on and make the most of the nice weather. What more could you ask for in your work place?   New terrace between building 39 and 40 As part of the programme of renewal and improvement of CERN's green areas, the GS Department entrusted Genève Espaces Verts, the company responsible for their upkeep and management, with the creation of a new terrace between Buildings 39 and 40. The terrace, which is made of a wood selected for its ability to withstand variations in temperature, is shady in the mornings and in the full sun from midday onwards. It can seat about a hundred people. Users can now unwind or drink their coffee at leisure in a peaceful and harmonious setting surrounded by flowers. Even here, though, physics is never far away: the flower pots made from the protective end-caps of the LHC magnets serve as a reminder of what we are all here for.     &...

  7. Terrace Layout Using a Computer Assisted System

    Science.gov (United States)

    Development of a web-based terrace design tool based on the MOTERR program is presented, along with representative layouts for conventional and parallel terrace systems. Using digital elevation maps and geographic information systems (GIS), this tool utilizes personal computers to rapidly construct ...

  8. Agricultural Terrace Pattern along Climatic Gradient

    Science.gov (United States)

    Ackermann, Oren; Svoay, Tal; Zhevelev, Helena M.

    2015-04-01

    Agricultural terraces are a well-distributed agrotechnical method for planting in various places in the world, from ancient time and until today. The aim of the current poster is to demonstrate the spatial distribution of agricultural terraces along a climatic gradient of sub-humid Mediterranean, semi-arid and arid climate zones. In the Judean Mountains (central Israel), a region under sub-humid Mediterranean conditions, agricultural terraces are characterized by terrace coverage on slopes and in valleys. Annual rainfall average in this region is 800 mm, allowing for vast rain-fed agriculture based on direct rain. In the Judean Shephelah (central Israel), a region under semi-arid conditions, agriculture terraces are located in small spots on the slopes, and in terrace fields in the valleys. Annual average rainfall in this region is between 300 and 400 mm. Rain-fed agriculture was sustained by direct rain and additional runoff generated on rock outcrops. In the Negev Highlands, (southern Israel), a region under arid climate conditions with annual rainfall average of 100 mm, runoff farm terraces are located in valleys, and agriculture sustenance was based on water harvesting from the slopes. In conclusion, climate has a dominant effect on agricultural terrace distribution, and ancient farmers knew how to adapt to different climate conditions.

  9. When is a terrace not a terrace? The importance of understanding landscape evolution in studies of terraced agriculture.

    Science.gov (United States)

    Ferro-Vázquez, C; Lang, C; Kaal, J; Stump, D

    2017-11-01

    Before the invention of modern, large-scale engineering projects, terrace systems were rarely built in single phases of construction, but instead developed gradually, and could even be said to have evolved. Understanding this process of landscape change is therefore important in order to fully appreciate how terrace systems were built and functioned, and is also pivotal to understanding how the communities that farmed these systems responded to changes; whether these are changes to the landscape brought about by the farming practices themselves, or changes to social, economic or climatic conditions. Combining archaeological stratigraphy, soil micromorphology and geochemistry, this paper presents a case-study from the historic and extensive terraced landscape at Konso, southwest Ethiopia, and demonstrates - in one important river valley at least - that the original topsoil and much of the subsoil was lost prior to the construction of hillside terraces. Moreover, the study shows that alluvial sediment traps that were built adjacent to rivers relied on widespread hillside soil erosion for their construction, and strongly suggests that these irrigated riverside fields were formerly a higher economic priority than the hillside terraces themselves; a possibility that was not recognised by numerous observational studies of farming in this landscape. Research that takes into account how terrace systems change through time can thus provide important details of whether the function of the system has changed, and can help assess how the legacies of former practices impact current or future cultivation. Copyright © 2017 Elsevier Ltd. All rights reserved.

  10. Ostracoda from Vestfold Hill lake terraces, Antarctica

    Digital Repository Service at National Institute of Oceanography (India)

    Setty, M.G.A.P.

    Six species of ostracodes are recorded from two transects of terraces of Deep Lake, Vestfold Hills, Antarctica. Two species (@iXesteleberis@@ sp. and @iBradleya dictyon@@) range from Cretaceous to Recent, @iPoseidonamicus aff. P. major@@ ranges from...

  11. Adoption of terraces in the Peruvian Andes

    NARCIS (Netherlands)

    Posthumus, H.

    2005-01-01

    Soil erosion is a serious constraint for agriculture and rural development in developing countries. Many efforts are made to promote soil and water conservation (SWC) among farm households. However, adoption of SWC practices is often disappointing. This thesis analyses the benefits of terraces and

  12. Living terraced landscapes: Exploring the viability of mountain terraced vineyards in Cyprus

    Science.gov (United States)

    Zoumides, Christos; Giannakis, Elias; Bruggeman, Adriana; Camera, Corrado

    2017-04-01

    Dry-stone terracing is an intensive cultivation practice that has been implemented for centuries in the Mediterranean region. The Troodos Ophiolite Complex on the island of Cyprus covers an area of 2332 km2 with 31% mean slope gradient, and consists of 140 small communities with a total population of around 50,000 inhabitants. Agriculture is practiced on dry-stone terraces with narrow (1-3 m) to medium-base (3-6 m) bench, constructed by cutting and filling in slopes with gradient between 20 and 40%. The main crop grown on terraces is wine grapes. However, many of the vineyards on terraced hillsides are being gradually abandoned and dry-stone walls remain unmaintained, causing a domino effect of collapsing terraces and leading to soil erosion and sedimentation of downstream infrastructure. The main reasons for the gradual decline of terraced landscapes are the ageing of farming population, the depopulation and marginalization of Troodos communities, the small size of agricultural plots, the high cost of labour and the loss of know-how on dry-stone wall maintenance. Despite these socio-economic issues, policy reforms, especially after the accession of Cyprus to the European Union in 2004, have created new challenges and opportunities, and have focused on improving the viniculture's quality rather than quantity. The new appellation of origin launched in 2007 that define where the wine-grapes are grown, as well as the incentives to create small regional wineries, helped maintain the population of some communities and the vine cultivations on dry-stone terraces. The aim of this study is to analyse the determinants of success or failure in sustaining the terraced vineyards in Cyprus. More precisely, the study explores the characteristics that determine the investment (or not) in terrace maintenance and analyses the interlinkages between farming practices and business strategies. The analysis is based on grape and wine production cost data that is acquired by interviews

  13. Cryoplanation Terraces: A Characteristic Upland Periglacial Landscape

    Science.gov (United States)

    Nyland, K. E.; Nelson, F. E.; Queen, C. W.

    2016-12-01

    Cryoplanation terraces (CTs) are alternating sequences of rubble-covered scarps and gently sloping treads ascending ridgecrests and hillsides, often culminating in extensive summit flats. CTs are ubiquitous in cold, unglaciated upland environments extending from the Ural Mountains to the Mackenzie Mountains. CTs are large erosional landforms cut in bedrock, but many examples appear to be largely independent of geologic structure. Although process investigations have never been carried out on cryoplanation terraces, the traditional interpretation that they are formed by intensified weathering and transport processes associated with late-lying snow cover, referred to by the shorthand term nivation, has been challenged in recent literature. The new spatial-analytic and field investigations reported here provide strong evidence in support of the "nivation formation hypothesis." The elevation trends of CTs and the glacial snowline are very similar, rising from 200-300 m.a.s.l. on islands in the Bering Sea (central Beringia) to 1200 m.a.s.l. near the Alaska-Yukon border in far-eastern Beringia. This correspondence indicates that, like cirques, CT formation is controlled by the mass balance of localized, late-lying snow. Exploratory data collected during the summer of 2016 at three sites in interior and western Alaska provide additional support for the nivation hypothesis. Four sedimentological lines of investigation were employed to observe relative patterns of weathering intensity and duration across terraces: 1) rock fracture distribution patterns; 2) clast shape indices; 3) Schmidt hammer rebound values; and 4) weathering-rind thickness. Preliminary results from transect-based sampling of these variables indicate that CT treads are time-transgressive surfaces, where progressively more weathered clasts are present with increasing distance downslope from scarp-tread junctures. Results from the preliminary field work support the nivation hypothesis of CT formation, but

  14. Agricultural Terrace Pattern Distribution and Preservation along Climatic Gradient

    Science.gov (United States)

    Ackermann, Oren

    2017-04-01

    Agricultural terraces are a well-distributed agrotechnical method for planting in various places in the world, from ancient time and until today. The aim of the current research is to demonstrate the spatial distribution and conservation of agricultural terraces along a climatic gradient of sub-humid Mediterranean, semi-arid and arid climate zones by presenting the case study of the Land of Israel. In the Judean Mountains (central Israel), a region under sub-humid Mediterranean conditions, agricultural terraces are characterized by terrace coverage on slopes and in valleys. Annual rainfall average in this region is 800 mm, allowing for vast rain-fed agriculture based on direct rain. In the Judean Shephelah (central Israel), a region under semi-arid conditions, agriculture terraces are located in small spots on the slopes, and in terrace fields in the valleys. Annual average rainfall in this region is between 300 and 400 mm. Rain-fed agriculture was sustained by direct rain and additional runoff generated on rock outcrops. In the Negev Highlands, (southern Israel), a region under arid climate conditions with annual rainfall average of 100 mm, runoff farm terraces are located in valleys, and agriculture sustenance was based on water harvesting from the slopes. The terraces pattern distribution is similar to the natural vegetation pattern distribution of the three given areas. During the past ten of years, changes in land use and farming methods have resulted in the abandonment of many agricultural terraces in the given areas. Terrace abandonment leads to the collapse of retaining walls and erosion of soil and sediments from the terrace body with the latter occurring at a high rate in the arid Negev highlands. However, in the Judean Mountains and the Judean Shephelah, areas under sub-humid Mediterranean and semi-arid conditions, the intensity of erosion is lower since the terraces are covered by dense shrubs such as Sarcopoterium spinosum or by trees. This plant cover

  15. a sedimentologic analysis of terrace sediments from the pawmpawm ...

    African Journals Online (AJOL)

    PUBLICATIONS1

    ABSTRACT. The object of this paper is to analyse the sedimentologic characteristics of old and new terrace sediments from the Pawmpawm River channel. The morphometric characteristics of the terrace materials give credence to the hydrologic dynamics of the river as it performs its core functions of erosion, transportation ...

  16. [Soft-ridged bench terrace design in hilly loess region].

    Science.gov (United States)

    Cao, Shixiong; Chen, Li; Gao, Wangsheng

    2005-08-01

    Reconfiguration of hillside field into terrace is regarded as one of the key techniques for water and soil conservation in mountainous regions. On slopes exceeding 30 degrees, the traditional techniques of terracing are difficult to apply as risers (i.e., backslopes), and if not reinforced, are so abrupt and easy to collapse under gravity alone, thus damaging the terrace. To improve the reconfiguration of hillside field into terrace, holistic techniques of soft-ridged bench terrace engineering, including revegetation, with trees and planting grasses on riser slopes, were tested between 1997 and 2001 in Xiabiangou watershed of Yan' an, Shaanxi Province. A "working with Nature" engineering approach, riser slopes of 45 degrees, similar to the pre-existing slope of 35 degrees, was employed to radically reduce gravity-erosion. Based on the concepts of biodiversity and the principles of landscape ecology, terrace benches, bunds, and risers were planted with trees, shrubs, forage grasses, and crops, serving to generate a diverse array of plants, a semi-forested area, and to stabilize terrace bunds. Soft-ridged bench terrace made it possible to significantly reduce hazards arising from gravity erosion, and reduce the costs of individual bench construction and maintenance by 24.9% and 55.5% of the costs under traditional techniques, respectively. Such a construction allowed an enrichment and concentration of nutrients in the soils of terrace bunds, providing an ideal environment for a range of plants to grow and develop. The terrace riser could be planted with drought-resistant plants ranging from forage grasses to trees, and this riser vegetation would turn the exposed bunds and risers existing under traditional techniques into plant-covered belts, great green ribbons decorating farmland and contributing to the enhancement of the landscape biology.

  17. Landsliding, topographic variables and location of cultural terraces in Slovenia

    Science.gov (United States)

    Komac, Blaž; Zorn, Matija

    2015-04-01

    For a large number of people living in hilly regions of Slovenia cultural terraces are important landscape elements. We know from previous studies that as many as half of vineyard terraces are built in areas which are highly susceptible to landslides, and a quarter in low landslide susceptibility areas. The contribution will present links between landslide susceptibility in terraced areas in Slovenia. Landslides are frequent element of cultural terraces-landscape. In Slovenia they are frequent in hilly and mountainous regions. The position of landslide areas is strongly influenced by the topography and thus indirectly by the construction of cultural terraces. They trigger during and after terraces construction when the drainage system is altered. Thus, agricultural activity leads to instability of slopes, and increases the production costs. Links between landsliding (Zorn and Komac 2004; 2008; 2009) and cultural terraces were determined using the geographic information systems. For the territory of Slovenia, we have already created landslide susceptibility map (Zorn and Komac 2004; 2008), while here we determined the correlation between landslides, topographic variables and location of cultural terraces. To achieve this aim, all areas of cultural terraces in Slovenia were digitized at the scale of 1:10,000. References Zorn, M., Komac B. 2004: Deterministic modeling of landslide and rockfall risk. Acta geographica Slovenica 44 (2), pp. 53-10. DOI: 10.3986/AGS44203 Zorn, M., Komac, B. 2008: Zemeljski plazovi v Sloveniji (Landslides in Slovenia). Georitem 8. Ljubljana: ZRC Publishing. Zorn, M., Komac, B. 2009: The importance of landsliding in a flysch geomorphic system: The example of the Gori\\vska brda Hills (W Slovenia). Zeitschrift für Geomorphologie N. F., Suppl. 56 (3), pp. 53-79. DOI: 10.1127/0372-8854/2012/S-00104

  18. Numerical model predictions of autogenic fluvial terraces and comparison to climate change expectations

    Science.gov (United States)

    Limaye, Ajay B. S.; Lamb, Michael P.

    2016-03-01

    Terraces eroded into sediment (alluvial) and bedrock (strath) preserve an important history of river activity. River terraces are thought to form when a river switches from a period of slow vertical incision and valley widening to fast vertical incision and terrace abandonment. Consequently, terraces are often interpreted to reflect changing external drivers including tectonics, sea level, and climate. In contrast, the intrinsic unsteadiness of lateral migration in rivers may generate terraces even under constant rates of vertical incision without external forcing. To explore this mechanism, we simulate landscape evolution by a vertically incising, meandering river and isolate the age and geometry of autogenic river terraces. Modeled autogenic terraces form for a wide range of lateral and vertical incision rates and are often paired and longitudinally extensive for intermediate ratios of vertical-to-lateral erosion rate. Autogenic terraces have a characteristic reoccurrence time that scales with the time for relief generation. There is a preservation bias against older terraces due to reworking of previously visited parts of the valley. Evolving, spatial differences in bank strength between bedrock and sediment reduce terrace formation frequency and length, favor pairing, and can explain sublinear terrace margins at valley boundaries. Age differences and geometries for modeled autogenic terraces are consistent, in cases, with natural terraces and overlap with metrics commonly attributed to terrace formation due to climate change. We suggest a new phase space of terrace properties that may allow differentiation of autogenic terraces from terraces formed by external drivers.

  19. Post-eruptive Submarine Terrace Development of Capelinhos, Azores

    Science.gov (United States)

    Zhongwei Zhao, Will; Mitchell, Neil; Quartau, Rui; Tempera, Fernando; Bricheno, Lucy

    2017-04-01

    Erosion of the coasts of volcanic islands by waves creates shallow banks, but how erosion proceeds with time to create them and how it relates to wave climate is unclear. In this study, historical and recent marine geophysical data collected around the Capelinhos promontory (western Faial Island, Azores) offer an unusual opportunity to characterize how a submarine terrace developed after the eruption. The promontory was formed in 1957/58 during a Surtseyan eruption that terminated with extensive lava forming new rocky coastal cliffs. Historical measurements of coastline position are supplemented here with coastlines measured from 2004 and 2014 Google Earth images in order to characterize coastline retreat rate and distance for lava- and tephra-dominated cliffs. Swath mapping sonars were used to characterize the submarine geometry of the resulting terrace (terrace edge position, gradient and morphology). Limited photographs are available from a SCUBA dive and drop-down camera deployments to ground truth the submarine geomorphology. The results reveal that coastal retreat rates have decreased rapidly with the time after the eruption, possibly explained by the evolving resistance to erosion of cliff base materials. Surprisingly, coastline retreat rate decreases with terrace width in a simple inverse power law with terrace width. We suspect this is only a fortuitous result as wave attenuation over the terrace will not obviously produce the variation, but nevertheless it shows how rapidly the retreat rate declines. Understanding the relationship between terrace widening shelf and coastal cliff retreat rate may be more widely interesting if they can be used to understand how islands evolve over time into abrasional banks and guyots.

  20. Quaternary Deformation of Sumba, Indonesia: Evidence from Carbonate Terraces

    Science.gov (United States)

    Dahlquist, M. P.; West, A. J.; Dolan, J. F.

    2014-12-01

    The Banda Arc of Indonesia remains one of the least understood tectonic domains on the modern Earth. The island of Sumba, located approximately 50 km south of Flores and 120 km north of the Java Trench, northwest of where it transitions into the Timor Trough, lies in a region of tectonic transition and potentially offers insights into regional dynamics. The Banda Arc is volcanically active, but Sumba itself is not volcanic. The northern coast of Sumba is covered in Quaternary coral terraces, with the rest of the island's surface geology composed of Mio-pliocene carbonates and uplifted Late Cretaceous-Oligocene forearc basin and volcanic rocks. The purpose of this study is to remotely map the topographic expression of the coral terraces and use the information gained to better understand deformation on Sumba since their deposition. The ages of the coral terraces, of which many platforms are exposed over significant areas of the island, have been constrained at Cape Luandi in north central Sumba, but uplift rates calculated from those ages may not be representative of the island as a whole. The lateral continuity of these dated terraces can help constrain the extent to which uplift of Sumba is spatially variable. Analysis of the terraces using SRTM digital elevation data with ArcGIS software makes it possible to trace the same terrace platforms over large distances, and shows that the north central part of the island has experienced the most uplift since the deposition of the terraces, forming an anticline with the east limb dipping more steeply than the west. The terraces are not well preserved on the southern half of the island. Exposure of older rocks and lack of terrace preservation, as well as a south-skewed drainage divide suggests the southern half of the island experiences greater exhumation, but this could be driven by climate or other factors and does not necessarily indicate more rapid uplift. Study of Quaternary deformation of Sumba can offer greater

  1. Economic and social activities on ancient Cypriot terraced landscapes.

    Science.gov (United States)

    Ridder, Elizabeth; Galletti, Christopher S; Fall, Patricia L; Falconer, Steven E

    2017-11-01

    We investigate ancient agricultural terraces and their associated social and economic activities across the site complex consisting of the village at Politiko-Troullia and its more extensive associated taskscape. Surface artifact distributions mapped over 12 ha are integrated with evidence excavated from this Bronze Age settlement in central Cyprus. Contrary to expectations, artifact densities do not diminish with distance from the village architecture. In particular, concentrations of Prehistoric Bronze Age ceramics and ground stone artifacts are most pronounced on nearby terraced hillsides. These terraces were not utilized for domestic structures, but for extensive processing of agricultural crops and copper ore. Bronze Age excavated plant remains indicate cultivation of olives, grapes and figs, with wood resources dominated by olive and pine. Larger, non-portable ground stones and gaming stones are associated with communal social and economic activities in open courtyard settings in Politiko-Troullia. This category of ground stone also is particularly common on the terraced hillsides around Troullia, suggesting that similar behaviors occurred beyond village structures. The terraced landscape of Politiko-Troullia exemplifies a multi-faceted taskscape with a range of agricultural, metallurgical and social activities. Copyright © 2016 Elsevier Ltd. All rights reserved.

  2. TerraceM: A Matlab® tool to analyze marine terraces from high-resolution topography

    Science.gov (United States)

    Jara-Muñoz, Julius; Melnick, Daniel; Strecker, Manfred

    2015-04-01

    To date, Light detection and ranging (LiDAR), high- resolution topographic data sets enable remote identification of submeter-scale geomorphic features bringing valuable information of the landscape and geomorphic markers of tectonic deformation such as fault-scarp offsets, fluvial and marine terraces. Recent studies of marine terraces using LiDAR data have demonstrated that these landforms can be readily isolated from other landforms in the landscape, using slope and roughness parameters that allow for unambiguously mapping regional extents of terrace sequences. Marine terrace elevation has been used since decades as geodetic benchmarks of Quaternary deformation. Uplift rates may be estimated by locating the shoreline angle, a geomorphic feature correlated with the high-stand position of past sea levels. Indeed, precise identification of the shoreline-angle position is an important requirement to obtain reliable tectonic rates and coherent spatial correlation. To improve our ability to rapidly assess and map different shoreline angles at a regional scale we have developed the TerraceM application. TerraceM is a Matlab® tool that allows estimating the shoreline angle and its associated error using high-resolution topography. For convenience, TerraceM includes a graphical user interface (GUI) linked with Google Maps® API. The analysis starts by defining swath profiles from a shapefile created on a GIS platform orientated orthogonally to the terrace riser. TerraceM functions are included to extract and analyze the swath profiles. Two types of coastal landscapes may be analyzed using different methodologies: staircase sequences of multiple terraces and rough, rocky coasts. The former are measured by outlining the paleo-cliffs and paleo-platforms, whereas the latter are assessed by picking the elevation of sea-stack tops. By calculating the intersection between first-order interpolations of the maximum topography of swath profiles we define the shoreline angle in

  3. The physical model of a terraced plot: first results

    Science.gov (United States)

    Perlotto, Chiara; D'Agostino, Vincenzo; Buzzanca, Giacomo

    2017-04-01

    Terrace building have been expanded in the 19th century because of the increased demographic pressure and the need to crop additional areas at steeper slopes. Terraces are also important to regulate the hydrological behavior of the hillslope. Few studies are available in literature on rainfall-runoff processes and flood risk mitigation in terraced areas. Bench terraces, reducing the terrain slope and the length of the overland flow, quantitatively control the runoff flow velocity, facilitating the drainage and thus leading to a reduction of soil erosion. The study of the hydrologic-hydraulic function of terraced slopes is essential in order to evaluate their possible use to cooperate for flood-risk mitigation also preserving the landscape value. This research aims to better focus the times of the hydrological response, which are determined by a hillslope plot bounded by a dry-stone wall, considering both the overland flow and the groundwater. A physical model, characterized by a quasi-real scale, has been built to reproduce the behavior of a 3% outward sloped terrace at bare soil condition. The model consists of a steel metal box (1 m large, 3.3 m long, 2 m high) containing the hillslope terrain. The terrain is equipped with two piezometers, 9 TDR sensors measuring the volumetric water content, a surface spillway at the head releasing the steady discharge under test, a scale at the wall base to measure the outflowing discharge. The experiments deal with different initial moisture condition (non-saturated and saturated), and discharges of 19.5, 12.0 and 5.0 l/min. Each experiment has been replicated, conducting a total number of 12 tests. The volumetric water content analysis produced by the 9 TDR sensors was able to provide a quite satisfactory representation of the soil moisture during the runs. Then, different lag times at the outlet since the inflow initiation were measured both for runoff and groundwater. Moreover, the time of depletion and the piezometer

  4. Capturing sediment and nutrients in irrigated terraced landscapes

    Science.gov (United States)

    Slaets, Johanna; Schmitter, Petra; Hilger, Thomas; Piepho, Hans-Peter; Dercon, Gerd; Cadisch, Georg

    2016-04-01

    Terraces are often promoted as green filters in landscapes, buffering discharge and constituent peaks. For irrigated rice terraces, however, this mitigating potential has not been assessed at the landscape level. Additionally, sediment and nutrient inputs potentially affect soil fertility in agricultural terraces and therefore yield - the extent of the impact depending on the quality and quantity of the captured material. Quantifying such upland-lowland linkages is particularly important in intensely cultivated landscapes, as declining upland soil fertility could alter beneficial hydrological connectivity between terraces and surrounding landscapes. In this study, we therefore quantified the sediment, sediment-associated organic carbon and nitrogen inputs and losses for a 13 ha paddy rice area, surrounded by upland maize cultivation in Northwest Vietnam in 2010 and 2011. Turbidity sensors were used in combination with a linear mixed model in order to obtain continuous predictions of the constituent concentrations. Sediment texture was determined using mid-infrared spectroscopy. Uncertainty on annual load estimates was quantified by calculating 95% confidence intervals with a bootstrap approach. Sediment inputs from irrigation water to the rice area amounted to 48 Mg ha-1 a-1 and runoff during rainfall events contributed an additional 16 Mg ha-1 a-1. Export from the rice terraces equalled 63 Mg ha-1 a-1 of sediments, resulting in a net balance of 28 Mg ha-1 a-1 or a trapping of almost half of the annual sediment inputs. Runoff contributed one third of the sand inputs, while irrigated sediments were predominantly silty. As paddy outflow contained almost exclusively silt- and clay-sized material, 24 Mg ha-1 a-1 of captured sediments consisted of sand. The sediment-associated organic carbon resulted in a deposit of 1.09 Mg ha-1 a-1. For sediment-associated nitrogen, 0.68 Mg ha-1 a-1 was trapped in the terraces. Combining both sediment-associated and dissolved nitrogen

  5. Digital data sets that describe aquifer characteristics of the Enid isolated terrace aquifer in northwestern Oklahoma

    Data.gov (United States)

    U.S. Geological Survey, Department of the Interior — This data set consists of a digitized polygon of a constant recharge value for the Enid isolated terrace aquifer in northwestern Oklahoma. The Enid isolated terrace...

  6. Effects of terracing on soil and water conservation in China: A meta-analysis

    Science.gov (United States)

    Chen, Die; Wei, Wei

    2017-04-01

    Terracing has long been considered a powerful strategy for soil and water conservation. However, the efficiency is limited by many factors, such as climate, soil properties, topography, land use, population and socioeconomic status. The aim of this critical review was to discuss the effects of terracing on soil and water conservation in China, using a systematic approach to select peer-reviewed articles published in English and Chinese. 46 individual studies were analyzed, involving six terracing structures (level terraces, slope-separated terraces, slope terraces, reverse-slope terraces, fanya juu terraces and half-moon terraces), a wide geographical range (Northeastern China, Southeastern hilly areas, Southwestern mountain areas and Northwestern-central China), and six land use types (forest, crop trees, cropland, shrub land, grassland and bare land) as well as a series of slope gradients ranging from 3° to 35°. Statistical meta-analysis with runoff for 593 observations and sediment for 636 observations confirmed that terracing had a significant effect on water erosion control. In terms of different terrace structures, runoff and sediment reduction were uppermost on slope-separated terraces. Land use in terraces also played a crucial role in the efficiency of conservation, and tree crops and forest were detected as the most powerful land covers in soil and water conservation due to large aboveground biomass and strong root systems below the ground, which directly reduces the pressure of terraces on rainwater redistribution. In addition, a significant positive correlation between slope gradients (3° 15° and 16° 35°) and terracing efficiency on soil and water conservation was observed. This study revealed the effectiveness and variation of terracing on water erosion control on the national scale, which can serve as a scientific basis to land managers and decision-makers.

  7. Soil slips and debris flows on terraced slopes

    Directory of Open Access Journals (Sweden)

    G. B. Crosta

    2003-01-01

    Full Text Available Terraces cover large areas along the flanks of many alpine and prealpine valleys. Soil slips and soil slips-debris flows are recurrent phenomena along terraced slopes. These landslides cause damages to people, settlements and cultivations. This study investigates the processes related to the triggering of soil slip-debris flows in these settings, analysing those occurred in Valtellina (Central Alps, Italy on November 2000 after heavy prolonged rainfalls. 260 landslides have been recognised, mostly along the northern valley flank. About 200 soil slips and slumps occurred in terraced areas and a third of them evolved into debris flows. Field work allowed to recognise the settings at soil slip-debris flow source areas. Landslides affected up to 2.5 m of glacial, fluvioglacial and anthropically reworked deposits overlying metamorphic basement. Laboratory and in situ tests allowed to characterise the geotechnical and hydraulic properties of the terrains involved in the initial failure. Several stratigraphic and hydrogeologic factors have been individuated as significant in determining instabilities on terraced slopes. They are the vertical changes of physical soil properties, the presence of buried hollows where groundwater convergence occurs, the rising up of perched groundwater tables, the overflow and lateral infiltration from superficial drainage network, the runoff concentration by means of pathways and the insufficient drainage of retaining walls.

  8. Foraminifera from the deep lake terraces, Vestfold hills, Antarctica

    Digital Repository Service at National Institute of Oceanography (India)

    Setty, M.G.A.P.; Williams, R.; Kerry, K.R.

    Fourteen species of planktonic and forty-two species of benthonic foraminifera are identified from two transects of terraces near Deep Lake in the Vestfold Hills, Antarctica. All the planktonic and a few of the benthonic species occur on the western...

  9. Monitoring and modelling for dry-stone walls terracement maintenance

    Science.gov (United States)

    Preti, Federico; Errico, Alessandro; Giambastiani, Yamuna; Guastini, Enrico; Penna, Daniele

    2017-04-01

    An analysis of dry-stone walls stability in agricultural areas based on innovative monitoring and modeling is here presented The field test took place in Lamole, a terraced rural area located in the province of Florence, Tuscany, central Italy, where wine production is the most important agricultural activity business. Results show a good capability of the model to predict the time-space distribution and the intensity of stresses on the instrumented dry-stone wall and to describe the bulging of the ancient ones. We obtained significant information on how the terrace failure in Lamole resulted mainly related to the water concentration pathways at specific portions of the walls. An accurate drainage of the terraced slopes, even by means of simple ditches, could reduce the concentration factor at the critical parts of terraces strongly reducing the water pressures on the walls. The analysis of the effects caused by high return time events has been carried out by means of artificially reproduced severe rainfalls on the presented experimental area.

  10. Ancient terraces as environmental archives in the southern Levant

    Science.gov (United States)

    Lucke, Bernhard; Kouki, Paula

    2017-04-01

    Remains of ancient terraces collecting runoff water are widespread in the southern Levant, and played a pivotal rule for agriculture since rainfall was often not sufficient for growing crops. In this context, it has been debated how large cities of antiquity such as Petra were supplied, since they are situated in an environment apparently hostile to food production. However, a survey of the hinterland of Petra showed that it represents in fact an agricultural landscape full of terrace remains, although these are largely eroded today. But excavations of profiles found surprisingly deep sediment bodies, showing only a limited connection with the respective bedrocks, and indicating that part of the sediments consist of windblown dust. As well, there are carbonate crusts and archaeological materials associated with the terraces, suggesting that they represent so far unexplored environmental archives. Although probably discontinuous and thus rather challenging records are present, the terraces and their sediments could be a key for a better understanding of past landscape changes in the region.

  11. Porosity prediction from seismic inversion, Lavrans Field, Halten Terrace

    Energy Technology Data Exchange (ETDEWEB)

    Dolberg, David M.

    1998-12-31

    This presentation relates to porosity prediction from seismic inversion. The porosity prediction concerns the Lavrans Field of the Halten Terrace on the Norwegian continental shelf. The main themes discussed here cover seismic inversion, rock physics, statistical analysis - verification of well trends, upscaling/sculpting, and implementation. 2 refs., 6 figs.

  12. Agricultural terraces and slope instability at Cinque Terre (NW Italy)

    Science.gov (United States)

    Brandolini, Pierluigi; Cevasco, Andrea

    2015-04-01

    Cinque Terre, located in the eastern Liguria, are one of the most representative examples of terraced coastal landscape within the Mediterranean region. They are the result of a century-old agricultural practice and constitute an outstanding example of human integration with the natural landscape. For this highly unusual man-made coastal landscape, the Cinque Terre have been recognized as a World Heritage Site by UNESCO since 1997 and became National Park in 1999. The complex network of retaining dry stone walls and drainage networks ensured through times the control of shallow water erosion and therefore, indirectly, favoured debris cover stability. The lack of maintenance of terracing due to farmer abandonment since the 1950s led to widespread slope erosion phenomena. The effects of such phenomena culminated during the 25 October 2011 storm rainfall event, when slope debris materials charged by streams gave rise to debris floods affecting both Monterosso and Vernazza villages. As the analysis of the relationships between geo-hydrological processes and land use in the Vernazza catchment highlighted, abandoned and not well maintained terraces were the most susceptible areas to shallow landsliding and erosion triggered by intense rainfall. As a consequence, the thousands of kilometres of dry stone walls retaining millions of cubic metres of debris cover at Cinque Terre currently constitute a potential menace for both villages, that are mainly located at the floor of deep cut valleys, and tourists. Given the increasing human pressure due to tourist activities, geo-hydrological risk mitigation measures are urgently needed. At the same time, restoration policies are necessary to preserve this extraordinary example of terraced coastal landscape. In this framework, the detailed knowledge of the response of terraced areas to intense rainfall in terms of slope instability is a topic issue in order to identify adequate land planning strategies as well as the areas where

  13. Modeling runoff and sediment yield from a terraced watershed using WEPP

    Science.gov (United States)

    Mary Carla McCullough; Dean E. Eisenhauer; Michael G. Dosskey

    2008-01-01

    The watershed version of WEPP (Water Erosion Prediction Project) was used to estimate 50-year runoff and sediment yields for a 291 ha watershed in eastern Nebraska that is 90% terraced and which has no historical gage data. The watershed has a complex matrix of elements, including terraced and non-terraced subwatersheds, multiple combinations of soils and land...

  14. Cost-benefit of bench terraces, a case study in Peru

    NARCIS (Netherlands)

    Posthumus, H.; Graaff, de J.

    2005-01-01

    Soil and water conservation measures like bench terraces can reduce erosion in highland crop production. A cost-benefit analysis for 11 cases of bench terraces was undertaken on the basis of both measured data and data obtained from farmers. It showed that the profitability of bench terraces was

  15. Assessment of dry-stone terrace wall degradation with a 3D approach

    Science.gov (United States)

    Djuma, Hakan; Camera, Corrado; Faka, Marina; Bruggeman, Adriana; Hermon, Sorin

    2016-04-01

    In the Mediterranean basin, terracing is a common element of agricultural lands. Terraces retained by dry-stone walls are used to conserve arable soil, delay erosion processes and retain rainfall runoff. Currently, agricultural land abandonment is widespread in the Mediterranean region leading to terrace wall failure due to lack of maintenance and consequently an increase in soil erosion. The objective of this study is to test the applicability of digital 3D documentation on mountainous agricultural areas for assessing changes in terrace wall geometry, including terrace wall failures and associated soil erosion. The study area is located at 800-1100 m above sea level, in the Ophiolite complex of the Troodos Mountains in Cyprus. Average annual precipitation is 750 mm. Two sites with dry-stone terraces were selected for this study. The first site had a sequence of three terrace walls that were surveyed. The uppermost terrace wall was collapsed at several locations; the middle at few locations; and the lowest was still intact. Three fieldwork campaigns were conducted at this site: during the dry season (initial conditions), the middle and end of the wet season. The second site had one terrace wall that was almost completely collapsed. This terrace was restored during a communal terrace rehabilitation event. Two fieldwork campaigns were conducted for this terrace: before and after the terrace wall restoration. Terrace walls were documented with a set of digital images, and transformed into a 3D point cloud (using web-based services and commercial software - Autodesk 123D catch and Menci Software uMap, respectively). A set of points, registered with the total station and geo-referenced with a GPS, enabled the scaling of the 3D model and aligning the terrace walls within the same reference system. The density (distance between each point) of the reconstructed point clouds is 0.005 m by Umap and 0.025 m by 123D Catch. On the first site, the model analysis identified wall

  16. Refurbishment and extension of the terrace of Restaurant No.1

    CERN Multimedia

    2009-01-01

    Work to refurbish and extend part of the terrace of Restaurant No.1 started in the first week of October and should last about two months. This is just a small part of the wide-ranging site infrastructure consolidation programme that began in April 2009. The new terrace, covering a surface area of 1770 m2 (compared with 1650 m2 today), is scheduled to be completed by the end of 2010 and will run all the way around the Restaurant No.1 extension. Work on the latter will affect part of Building 501 during the period from April to October 2010. The new dining room will seat some 275 additional customers (see picture). Part of the Cedars car-park will remain closed until some time in December to provide site access for trucks transporting construction materials, plant, etc. CERN Bulletin

  17. Thallium in fractions of soil formed on floodplain terraces.

    Science.gov (United States)

    Jakubowska, Monika; Pasieczna, Anna; Zembrzuski, Wlodzimierz; Swit, Zbigniew; Lukaszewski, Zenon

    2007-01-01

    Two soils formed on the floodplain terrace of a rivulet flowing through the zinc-lead ore exploration area polluted with thallium and one soil from a floodplain terrace of the reference area were investigated in terms of thallium distribution between soil fractions. Such type of soil is formed on river floodplain terraces next to the main river channel and its composition records the history of river pollution. A sequential extraction of soil according to the BCR protocol was performed with an additional initial stage of extraction with water. Apart from labile thallium, thallium entrapped in the residual parent matter was also determined. Thallium was determined by flow-injection differential-pulse anodic stripping voltammetry. In all three cases, the major fraction is thallium entrapped in parent matter. Top soil from the polluted area contains 49.3% thallium entrapped in the residual parent matter, the bottom soil contains 41% while the reference soil contains 80% in this fraction. The major part of labile thallium is located in the reducible fraction (27.7% of total thallium in the top soil, 27% in the bottom soil and 12.4% of the reference soil). Second in terms of significance is the fraction of oxidizable thallium. The top soil contains 12% of total thallium concentration, the bottom soil contains 19% of total concentration, while the reference soil contains 4.1% of total concentration. The acid soluble/exchangeable fraction of thallium has almost the same significance as the oxidizable fraction. The top soil contains 10.4% of the total concentration, while the bottom soil contains 12% of the total concentration. Water soluble thallium concentration is very small. Comparison of the top and the bottom soil show that thallium has not been transported from the river channel onto the floodplain terrace over a long period.

  18. Relationships between soil parameters and vegetation in abandoned terrace fields vs. non-terraced fields in arid lands (Lanzarote, Spain): An opportunity for restoration

    Science.gov (United States)

    Arévalo, José Ramón; Fernández-Lugo, Silvia; Reyes-Betancort, J. Alfredo; Tejedor, Marisa; Jiménez, Concepción; Díaz, Francisco J.

    2017-11-01

    Over 90% of terraced fields have been abandoned on the island of Lanzarote in the last 40 years. The present work analyses the effects of abandonment on the soil and vegetation recovery of terraced field agroecosystems by comparing them with adjacent non-terraced fields in Lanzarote, Canary Islands (Spain). This information is necessary to take the appropriate management actions to achieve goals such as soil protection and biodiversity conservation. Results indicate that terraced fields display better soil quality than non-terraced ones, as shown by the significant differences found in parameters such as SAR, exchangeable Na, CaCO3, B content, moisture content or soil depth. Moreover, the terraced fields' plant community has more species similarities with the native plant community when compared with non-terraced areas. Owing to characteristics such as deeper soils, more water capacity, lower salinity and less sodic soils, terraced soils provide better conditions for passive restoration of both soil and vegetation. Therefore, the recovery and maintenance of wall structures and revegetation with native/endemic species are proposed to promote the restoration of native systems and preserve a landscape with cultural and aesthetic value.

  19. Assessing functional equivalency of nekton habitat in enhanced habitats: Comparison of terraced and unterraced marsh ponds

    Science.gov (United States)

    La Peyre, M.K.; Gossman, B.; Nyman, J.A.

    2007-01-01

    A primary goal of many coastal restoration programs is to increase nekton habitat in terms of both quantity and quality. Using shallow water ponds rehabilitated with a technique called marsh terracing, we examined the quality of nekton habitat created, using and comparing several metrics including nekton density and diversity, functional group composition, and weight-length relationships as indirect measures of habitat quality. We examined three paired terraced and unterraced marsh ponds in southwest Louisiana. Nekton, submerged aquatic vegetation (SAV), and soil and water quality variables were sampled bimonthly from April 2004 through April 2005 at four subtidal habitat types: terraced nearshore, terraced open water, unterraced nearshore, and unterraced open water. Results indicate that terraced ponds had increased the habitat value of degrading unterraced ponds over open water areas for estuarine nekton; nekton density and richness were similar between terraced and unterraced nearshore habitat types, but greater at all nearshore as compared to open water sites. Analysis of the distribution of nekton functional groups and weight:length ratios indicates the terraced and unterraced pond habitats were not functioning similarly: distribution of nekton functional groups differed significantly between habitat types with greater percentages of benthic-oriented species at unterraced open water habitats and higher percentage of open water species in terraced ponds as compared to unterraced ponds, and two of the six numerically dominant fish species had greater weight-length relationships in unterraced ponds as compared to terraced ponds. This lack of functional equivalency may be attributed to environmental differences between terraced and unterraced ponds such as water depth or SAV biomass, or the relatively young age of the terraces studied, which may not have allowed for the development of some critical habitat variables, such as soil organic matter that was found to

  20. Shading Performance on Terraced House Facades in Putrajaya, Malaysia

    Directory of Open Access Journals (Sweden)

    Hassan Ahmad Sanusi

    2015-01-01

    Full Text Available This study evaluates shading performance on house facades of selected three terraced houses in Putrajaya, Malaysia as the case studies. Terraced house type is selected for the case study because it is the most popular house type built in this country to house an increase of the urban population. Its total number built in urban area increases from 27% of the total dwellings in 1980 to 40% in 1990, and to slightly more than 60 per cent in 2000. The Case Study A, B, and C are atypical style of terraced house facade designs built in Putrajaya. These postmodern designs exhibit a range of complex geometric elements blending of colonial and traditional elements with colorful styles on the house facade. In this study, the time at which the sun path perpendicular to the house facade will be used to gain the results of shading performances when the house facades have their maximum exposure to the direct sunlight. The house facade was divided into two main parts which are opaque and glazing surface elements. The amount of shading area on the opaque and glazing surface was simulated using the SunTool program. In conclusion, the Case Study C had the highest average percentage of the shading area, which is 64.43%, followed by the Case Study A 60.41% and Case Study B 56.29%. These results showed that the facade designs had excellent horizontal shading elements with roof overhangs for high angle sunlight but they had weak vertical shading elements due to a lack of considerations of louvered elements to block low angle sunlight.

  1. Chronostratigraphical investigations on Pleistocene fluvioglacial terraces of NW-Austria

    Science.gov (United States)

    Terhorst, B.

    2009-04-01

    Investigations on paleopedology and Quaternary stratigraphy were carried out in the area of fluvioglacial terraces of the rivers Inn and Traun/Enns. Research projects have been financed by the German Research Foundation (DFG) and the ICSU Grant Programme. Detailed studies were carried out on paleosols and loess sequences of different ages. The investigations of the research group were focused on loess/paleosol sequences located on top of Riss terraces (OIS 6 and older) as well as in areas with Mindel and Günz terraces. Loess records of the last glacial/interglacial cycle can be well observed in the study areas. Generally, the Eemian soil (O/S 5e) is developed as a reddish Bt-horizon in fluvioglacial gravels. U/Th-datings of calcites in the fluvioglacial sediments are indicating that soil formation took place in the catchment area about 113.000 ± 4.400 ka (Terhorst et al., 2002). The interglacial paleosol was truncated and a redeposited colluvial layer was deposited on top of the Bt-horizons containing charcaol with characteristic relicts of coniferous trees. After this land surface destabilisation phase, sedimentation of loess became the predominant process. Pedogenesis in form of a brown paleosol occurred, which partly has been redeposited. The pedocomplex is characterized by intense bioturbation of steppe animals. OSL-datings show that this part of the sequence belong to the Middle Würmian stage. The pedocomplex is overlain by a Cambisol corresponding to the youngest Middle Würmian interstadial. The paleosol is covered by thick loess deposits of the Upper Pleniglacial. Well-developed Tundragleysols subdivide the loess deposits. The uppermost soil corresponds to the Holocene Luvisol that includes hydromorphic properties. Older fluvioglacial terraces of Mindel and Günz age (in the classical stratigraphy) show a completely different structure of the covering layers (c.f. Kohl, 1999). In this case, several thick interglacial paleosols are embedded within records

  2. Time scale for degradation and erosion of archaeological terraces in the Judea Mountains, Israel

    Science.gov (United States)

    Porat, Naomi; Elinson, Rotem; Ben Dor, Eyal; Avni, Yoav; Gadot, Yuval

    2017-04-01

    The fate of mountain bench terraces which have been abandoned in ancient times is puzzling. On the one hand recently abandoned terraces undergo rapid degradation by walls crumbling, leading to soil being washed by rain water out of breaches in the walls, suggesting that within a short time all soil would be washed down-slope. On the other hand slopes with degraded terraces appear to still retain much soil even though only faint remains of the terraces exist. Moreover, if soil is rapidly eroded down-slope when terraces are no longer maintained, where do subsequent terrace builders find the soil to fill behind the stone walls? These questions were addressed as part of a larger study on the chronology of terraces in the Judea Mountains, Israel. Previous OSL dating of terrace soils in the region showed that the majority of the maintained terraces were constructed during the past 700 years, and only occasionally older ages were obtained for the soil at the very base of these terraces. Concerns were raised that soil erosion caused earlier events of terrace construction to disappear. To check if terraces and soils indeed erode entirely and how long this might take, we selected a relatively smooth hill slope showing small patches of limestone bedrock as well as remains of highly degraded sets of terraces. Three pits were excavated in soils within three different terrace remains down to bedrock, some to a depth of 2 m, and samples for OSL dating were collected from the exposed soil sections. In all three pits the lowermost samples gave ages of 3000-4500 years before the present, possibly the natural soils before any human intervention. However samples from a depth of 35-45 cm gave ages of 350-200 years, providing the last time the soil at that depth was exposed to sunlight. This suggests that the terraces were abandoned in the past 200 years or so and since then degraded. However the thick soil present on most of the slope suggests that after the first stage of rapid

  3. Dating of river terraces along Lefthand Creek, western High Plains, Colorado, reveals punctuated incision

    Science.gov (United States)

    Foster, Melissa A.; Anderson, Robert S.; Gray, Harrison J.; Mahan, Shannon A.

    2017-10-01

    The response of erosional landscapes to Quaternary climate oscillations is recorded in fluvial terraces whose quantitative interpretation requires numerical ages. We investigate gravel-capped strath terraces along the western edge of Colorado's High Plains to constrain the incision history of this shale-dominated landscape. We use 10Be and 26Al cosmogenic radionuclides (CRNs), optically stimulated luminescence (OSL), and thermally transferred OSL (TT-OSL) to date three strath terraces, all beveled in shale bedrock and then deposited upon by Lefthand Creek, which drains the crystalline core of the Front Range. Our study reveals: (i) a long history (hundreds of thousands of years) of fluvial occupation of the second highest terrace, T2 (Table Mountain), with fluvial abandonment at 92 ± 3 ka; (ii) a brief occupation of a narrow and spatially confined terrace, T3, at 98 ± 7 ka; and (iii) a 10-25 thousand year period of cutting and fluvial occupation of a lower terrace, T4, marked by the deposition of a lower alluvial unit between 59 and 68 ka, followed by deposition of an upper alluvial package at 40 ± 3 ka. In conjunction with other recent CRN studies of strath terraces along the Colorado Front Range (Riihimaki et al., 2006; Dühnforth et al., 2012), our data reveal that long periods of lateral planation and fluvial occupation of strath terraces, sometimes lasting several glacial-interglacial cycles, are punctuated by brief episodes of rapid vertical bedrock incision. These data call into question what a singular terrace age represents, as the strath may be cut at one time (its cutting-age) and the terrace surface may be abandoned at a much later time (its abandonment age), and challenge models of strath terraces that appeal to simple pacing by the glacial-interglacial cycles.

  4. Research on Remote Sensing recognition features of Yuan Yang Terraces in Yunnan Province (China)

    Science.gov (United States)

    Xiang, Jie; Chen, Jianping; Lai, ZiLi; Yang, Wei

    2016-04-01

    Yuan Yang terraces is one of the most famous terraces in China, and it was successfully listed in the world heritage list at the 37th world heritage convention. On the one hand, Yuan Yang terraces retain more soil and water, to reduce both hydrological connectivity and erosion, and to support irrigation. On the other hand, It has the important tourism value, bring the huge revenue to local residents. In order to protect and make use of Yuan Yang terraces better, This study analyzed the spatial distribution and spectral characteristics of terraces:(1) Through visual interpretation, the study recognized the terraces based on the spatial adjusted remote sensing image (2010 Geoeye-1 with resolution of 1m/pix), and extracted topographic feature (elevation, slope, aspect, etc.) based on the digital elevation model with resolution of 20m/pix. The terraces cover a total area of about 11.58Km2, accounted for 24.4% of the whole study area. The terraces appear at range from 1400m to 1800m in elevation, 10°to 20°in slope, northwest to northeast in aspect; (2) Using the method of weight of evidence, this study assessed the importance of different topographic feature. The results show that the sort of importance: elevation>slope>aspect; (3) The study counted the Normalized Difference Vegetation Index (NDVI) changes of terraces throughout the year, based on the landsat-5 image with resolution of 30m/pix. The results show that the changes of terraces' NDVI are bigger than other stuff (e.g. forest, road, house, etc.). Those work made a good preparations for establishing the dynamic remote sensing monitoring system of Yuan Yang terraces.

  5. A change in landscape: Lessons learned from abandonment of ancient Wari agricultural terraces in Southern Peru.

    Science.gov (United States)

    Londoño, Ana C; Williams, Patrick Ryan; Hart, Megan L

    2017-11-01

    Ancient agricultural terrace practices have survived for millennia, sustaining populations through extreme climatic shifts and political regime changes. In arid regions with abrupt relief such as Southern Peru, agricultural terracing is undergoing a resurgence, as has seen revitalization of once abandoned terrace and hydraulic systems. Wari terraces at Cerro Baul provide clues to past cultural practices. They also document sustainable farming practices by using resilient land management techniques which can help combat desertification and degradation of arable lands. Three abandoned Wari terrace systems were mapped using microtopographic methods, the erosion patterns examined, the states of preservation compared, and then the design contrasted with modern terracing practices in the Moquegua Valley. In order to negate the harmful effects of desertification, rehabilitation and reconstruction of these terraces using ancient knowledge and techniques may be necessary. Rehabilitation must be conducted with consideration for preservation of cultural patrimony that may be encountered within the terrace treads or riser structures. With future climatic shifts impacting vulnerable dryland areas more than others, the ability to resiliently respond to these changes may be found in the lessons learned from ancient farming techniques such as the Wari. Copyright © 2017 Elsevier Ltd. All rights reserved.

  6. Carbon stocks of the terraces of the Lower Tana River floodplain ...

    African Journals Online (AJOL)

    Few studies have addressed the terraces adjacent to the Tana River and delta. In May 2012 a survey assessed the woody vegetation of the terraces in anticipation of their conversion to a biofuel farm. The 64 000 hectares targeted by Bedford Biofuels for clearing for Jatropha curcas would have released over 1 million Mg of ...

  7. Nutrient Losses by Runoff and Sediment from the Taluses of Orchard Terraces

    NARCIS (Netherlands)

    Duran Zuazo, V.H.; Martinez Ray, A.; Aguilar Ruiz, J.

    2004-01-01

    The nutrient fluxes of nitrate, ammonium, phosphorus and potassium in runoff and sediments were evaluated over a two-year period (1999¿2000) on the taluses of terraces, in a zone of intense subtropical orchard cultivation (SE Spain). The erosion plots were located on a terrace of 214% (65°) slope,

  8. Designing terraces for the rainfed farming region in Iraq using the RUSLE and hydraulic principles

    Directory of Open Access Journals (Sweden)

    Mohammad H. Hussein

    2016-03-01

    Full Text Available The rainfed region in Iraq comprises an area of more than 5 million ha of forest, grazing and farmland areas. Except the plains, the region suffers from moderate to severe water erosion due mainly to overgrazing and land mismanagement. Due to population growth and the shortage in water resources, an expansion in land used for agriculture in the region is expected. Terracing is an option when utilizing sloping land for agricultural production. A terrace design criterion was developed for the region in which terrace spacing was determined using the Revised Universal Soil Loss Equation (RUSLE; terrace channel specifications were determined using conventional hydraulic computations. Analyses showed that terracing is feasible on rolling and hilly sloping land in the high rainfall zone (seasonal rainfall >600 mm where economic crops are grown to offset the high cost of terrace construction and maintenance. In the medium and low rainfall zones (seasonal rainfall 400–600 mm and 300–400 mm, terracing for water erosion control is generally not needed on cultivated land less than 10% in slope where wheat and barley crops are normally grown; however, pioneer research projects are needed to assess the feasibility of terraces of the level (detention type to conserve rain water in these two zones for a more successful rainfed farming venture.

  9. Terrace effects on soil erosion processes in a watershed of the loess plateau

    Science.gov (United States)

    Terraces in crop fields are one of the most important soil and water conservation measures that affect runoff and erosion processes in a watershed. In this paper, terrace effects on soil erosion and sediment transport in the upstream and middle sections of the Weihe River basin in the Loess Plateau ...

  10. Separating Catalytic Activity at Edges and Terraces on Platinum: Hydrogen Dissociation

    NARCIS (Netherlands)

    Groot, I.M.N.; Kleyn, A.W.; Juurlink, L.B.F.

    2013-01-01

    Heterogeneous catalysis relies to a large extent on the reactivity of metal nanoparticles. The surface of these particles consists of atomically smooth terraces and edges. As local environments of atoms in edges and terraces are different, their catalytic ability varies. This severely complicates

  11. The Species Composition on Agricultural Terraces in NW Part of Slovakia

    Directory of Open Access Journals (Sweden)

    Machová Iva

    2014-12-01

    Full Text Available The article contributes to a deeper understanding of agricultural terraces in NW Slovakia. The agricultural terraces found in 12 mountain ranges were characterised in detail on 32 localities. The slope parts of the studied terraces are on average only 2.3 m wide and current and former agricultural areas between them are on average 11 m wide. Furthermore, seventy phytosociological relevés were made on the terraces. Overall, 360 species of vascular plants were found in the relevés, 66 of which appeared regularly The localities were evaluated by DCA analysis. The main factor infuencing the species composition appears to be the geological composition of the bedrock and, probably the altitude as well. High coverage of the herb layer (median value 95%, low coverage of the shrub layer (median value 5% and the absence or a very low coverage of the tree layer is typical for these terraces.

  12. Digital data sets that describe aquifer characteristics of the Tillman terrace and alluvial aquifer in southwestern Oklahoma

    Data.gov (United States)

    U.S. Geological Survey, Department of the Interior — This data set consists of digital aquifer boundaries for the Tillman terrace and alluvial aquifer in southwestern Oklahoma. The Tillman terrace aquifer encompasses...

  13. Characteristic of composite pine forests on Volga terraces of Tatarstan

    Directory of Open Access Journals (Sweden)

    N. B. Prokhorenko

    2017-04-01

    Full Text Available The structure of pine forests in various natural areas of European Russia depends on environmental conditions, specifics of soil and underlying parent rock. Types of pine forests are distinguished by such features as their species composition of the lower layers, structure of grass-shrub layer and the nature of its mosaic. The purpose of the study are regional features of the composite pine forests, distributed on ancient terraces of left bank of the Volga River in north-western Tatarstan, considering specifics of their position in the contact zone of coniferous-deciduous forests with steppes. The structure of the communities of the pine forests on such indicators as species richness, quantitative participation of species, their occurrence and horizontal structure of grass cover were analyzed, and detailed description of the stand and of its renewal was given. In addition, ecological and coenotic structure of communities of pine forests was investigated. It was found that group of types of composite pine forests on the slopes and flat sections of high Volga terraces in northwest of Tatarstan are distinguished by age and completeness of the stand, but is characterized by similar composition of dominant species of lower layer and microgroups in grass layer composition. These communities are characterized by high participation of meadow-steppe plants. This feature distinguishes them from composite pine forests that are found in the central part of the European Russia. This is due to the fact that the area of our study takes position of a buffer, with broad invasion of meadow and meadow-steppe species in the communities of pine forests, especially when anthropogenic disturbances take place. The probability of further transformation of pine stands in the direction of their xerophytization has been identified.

  14. The Uranium-trend dating method: Principles and application for southern California marine terrace deposits

    Science.gov (United States)

    Muhs, D.R.; Rosholt, J.N.; Bush, C.A.

    1989-01-01

    Uranium-trend dating is an open-system method for age estimation of Quaternary sediments, using disequilibrium in the 238U234U230Th decay series. The technique has been applied to alluvium, colluvium, loess, till, and marine sediments. In this study we tested the U-trend dating method on calcareous marine terrace deposits from the Palos Verdes Hills and San Nicolas Island, California. Independent age estimates indicate that terraces in these areas range from ???80 ka to greater than 1.0 Ma. Two low terraces on San Nicolas Island yielded U-trend plots that have a clustered array of points and the ages of these deposits are indeterminate or highly suspect. Middle Pleistocene terraces and one early Pleistocene terrace on San Nicolas Island and all terraces on the Palos Verdes Hills gave reasonably linear U-trend plots and estimated ages that are stratigraphically consistent and in agreement with independent age estimates. We conclude that many marine terrace deposits are suitable for U-trend dating, but U-trend plots must be carefully evaluated and U-trend ages should be consistent with independent geologic control. ?? 1989.

  15. Soil-plant mercury concentrations in the Idrijca river terraces (Slovenia

    Directory of Open Access Journals (Sweden)

    Mateja Gosar

    2004-12-01

    Full Text Available The subjects of research are mercury contents in plants and soils on river terraces in the lower reaches of the Idrijca River. Samples of averaged meadow forage and plaintain (Plantago lanceolata contain from 0.055 to 0.220 mg Hg/kg in dry matter. In comparison to samples from Idrija in the 1970's these contents are relatively low with respect to mercury in soil. They are similar to those established in the surroundings of the abandoned Podljubelj mercury mine. However, with respect to contents in non-polluted soils the contents on Idrijca river terraces are considerably above the background.Total mercury in plants is influenced only to some degree by its contents in soils. Comparison of samples on terraces at the Temnikar farm shows that the contents in soil increase discontinuously from the third towards the first terrace. But in plants these differences are small, probably owing to the large part of mercury being contained in cinnabar that is inaccessible to plants. On the first river terrace (TEM3 locality where soil contains about 55 times more Hg than on the second terrace, the average forage sample contains only 1.6 times and plantain sample 1.8 times higher Hg than the corresponding samples on the third terrace.

  16. Main Terrace vertical offset data for the Lower Rhine Graben, central Europe – Data Release

    Data.gov (United States)

    U.S. Geological Survey, Department of the Interior — This data release includes vertical offset information for the regionally extensive Main Terrace in the Lower Rhine Graben in the border region between Germany,...

  17. Effectiveness of the GAEC standard of cross compliance retain terraces on soil erosion control

    Directory of Open Access Journals (Sweden)

    Paolo Bazzoffi

    2011-08-01

    Full Text Available The GAEC standard retain terraces of cross compliance prohibits farmers the elimination of existing terraces, with the aim to ensure the protection of soil from erosion. In the Italian literature there are not field studies to quantify the effects of the elimination or degradation of terraces on soil erosion. Therefore, the modeling approach was chosen and applied in a scenario analysis to evaluate increasing levels of degradation of stone wall terraces. The study was conducted on two sample areas: Lamole (700.8 ha, Tuscany and Costaviola (764.73 ha, Calabria with contrasting landscapes. The Universal Soil Loss Equation model (USLE was applied in the comparative assessment of the soil erosion risk (Mg . ha-1 . yr-1, by simulating five increasing intensity of terrace degradation, respectively: conserved partially damaged, very damaged, partially removed, removed, each of which corresponding to different values of the indexes of verification in case of infringement to GAEC standard provided for by the AGEA rules which have come into force since December 2009 (Agency for Agricultural Payments. To growing intensity of degradation, a progressive loss of efficacy of terraces was attributed by increasing the values of the LS factor (length and slope of USLE in relation with the local modification of the length and steepness of the slope between adjacent terraces. Basically, it was simulated the gradual return to the natural morphology of the slope. The results of the analysis showed a significant increase in erosion in relationship with increasing degradation of terraces. Furthermore, it is possible to conclude that the GAEC standard retain terraces is very effective with regard to the primary objective of reducing erosion. A further statistical analysis was performed to test the protective value of terraces against soil erosion in areas where agriculture was abandoned. The analysis was carried out by comparing the specific risk of erosion (Mg . ha-1

  18. Territorial Analysis of the Agricultural Terraced Landscapes of Tuscany (Italy): Preliminary Results

    National Research Council Canada - National Science Library

    Agnoletti, Mauro; Conti, Leonardo; Frezza, Lorenza; Santoro, Antonio

    2015-01-01

    ... of the country. The progressive abandonment of rural areas and farmland that began in the 1960s has led to the disintegration and disappearance of many terraces, representing one of the problems con...

  19. Digital data sets that describe aquifer characteristics of the Enid isolated terrace aquifer in northwestern Oklahoma

    Data.gov (United States)

    U.S. Geological Survey, Department of the Interior — This data set consists of digitized polygons of constant hydraulic conductivity values for the Enid isolated terrace aquifer in northwestern Oklahoma. The Enid...

  20. Holocene submarine terraces on the western continental shelf of India; implications for sea-level changes

    Digital Repository Service at National Institute of Oceanography (India)

    Wagle, B.G.; Vora, K.H.; Karisiddaiah, S.M.; Veerayya, M.; Almeida, F.

    -beach/barrier terraces are discernible in the terrigenous regime, which is located north and south of these latitudes. Despite their genetic differences, their evolution is ascribed to reef growth, progaradation and wave activity during the lowstands of sea level...

  1. Groundwater flood of a river terrace in southwest Wisconsin, USA

    Science.gov (United States)

    Gotkowitz, Madeline B.; Attig, John W.; McDermott, Thomas

    2014-09-01

    Intense rainstorms in 2008 resulted in wide-spread flooding across the Midwestern United States. In Wisconsin, floodwater inundated a 17.7-km2 area on an outwash terrace, 7.5 m above the mapped floodplain of the Wisconsin River. Surface-water runoff initiated the flooding, but results of field investigation and modeling indicate that rapid water-table rise and groundwater inundation caused the long-lasting flood far from the riparian floodplain. Local geologic and geomorphic features of the landscape lead to spatial variability in runoff and recharge to the unconfined sand and gravel aquifer, and regional hydrogeologic conditions increased groundwater discharge from the deep bedrock aquifer to the river valley. Although reports of extreme cases of groundwater flooding are uncommon, this occurrence had significant economic and social costs. Local, state and federal officials required hydrologic analysis to support emergency management and long-term flood mitigation strategies. Rapid, sustained water-table rise and the resultant flooding of this high-permeability aquifer illustrate a significant aspect of groundwater system response to an extreme precipitation event. Comprehensive land-use planning should encompass the potential for water-table rise and groundwater flooding in a variety of hydrogeologic settings, as future changes in climate may impact recharge and the water-table elevation.

  2. Adaptive restoration of river terrace vegetation through iterative experiments

    Science.gov (United States)

    Dela Cruz, Michelle P.; Beauchamp, Vanessa B.; Shafroth, Patrick B.; Decker, Cheryl E.; O’Neil, Aviva

    2014-01-01

    Restoration projects can involve a high degree of uncertainty and risk, which can ultimately result in failure. An adaptive restoration approach can reduce uncertainty through controlled, replicated experiments designed to test specific hypotheses and alternative management approaches. Key components of adaptive restoration include willingness of project managers to accept the risk inherent in experimentation, interest of researchers, availability of funding for experimentation and monitoring, and ability to restore sites as iterative experiments where results from early efforts can inform the design of later phases. This paper highlights an ongoing adaptive restoration project at Zion National Park (ZNP), aimed at reducing the cover of exotic annual Bromus on riparian terraces, and revegetating these areas with native plant species. Rather than using a trial-and-error approach, ZNP staff partnered with academic, government, and private-sector collaborators to conduct small-scale experiments to explicitly address uncertainties concerning biomass removal of annual bromes, herbicide application rates and timing, and effective seeding methods for native species. Adaptive restoration has succeeded at ZNP because managers accept the risk inherent in experimentation and ZNP personnel are committed to continue these projects over a several-year period. Techniques that result in exotic annual Bromus removal and restoration of native plant species at ZNP can be used as a starting point for adaptive restoration projects elsewhere in the region.

  3. Ancient Agricultural Terraces and the Soil Erosion Paradox

    Science.gov (United States)

    Brown, Tony

    2015-04-01

    Geoarchaeology lies at the heart of debates about societal stability and change. Geomorphological research has been used as a foundation for simplistic models of resource depletion based almost entirely on the comparison of soil erosion rates with long-term so- called 'geological' rates. However, the neo-catastrophic collapse of complex agricultural societies is rare, and where it is convincing demonstrated it is even more rarely monocausal. Indeed many societies appear to have continued agricultural exploitation of climatically marginal lands for far longer than soil depletion estimates would forecast. One reason may be that this soil depletion approach has grossly simplified soil creation through weathering, and neglected how past agriculture also affected the soil creation rate (especially on some lithologies) and how soil was conserved (terraces) and utilised even after transport. However, we now have we know have some potentially valuable new tools, including mineral magnetics and cosmogenic nuclides, which can be used to estimate changing soil weathering rates. This approach will be discussed with examples from both the temperate and Mediterranean climatic zones and in relation to causative models of change in complex agricultural societies.

  4. Using OSL to decipher past soil history in archaeological terraces, Judea Highlands, Israel

    Science.gov (United States)

    Porat, Naomi; Gadot, Yuval; Davidovich, Uri; Avni, Yoav; Avni, Gideon; Golan, Dani

    2015-04-01

    Archaeological terraces are the most prominent feature of the agricultural sphere in the hilly landscape throughout the Mediterranean. Using terrace walls for the artificial creation of arable plots of land was a major technological innovation that has completely altered the natural terrain. As such, the dating of these simply built features is of upmost importance. Archaeological excavations and OSL dating of the soil infill of terraces were carried out in three excavation areas at Mt. Eitan in the Judea Highlands, Israel. Previous survey showed that Mt. Eitan was settled continuously at least from the Middle Bronze Age (ca 3800 years ago) and until modern times. The OSL ages shows that all extant terraces were constructed in the past 550-200 years, in the Ottoman period. Older ages are limited only to the base of a few terraces, and they range from the Roman Period (ca 1800 years ago) to Mamluk times (ca 700 years ago). Many of the soil samples contain quartz grains with older ages, indicating incomplete bleaching of the sediment at the time of terrace construction. We used the finite mixture model to find out if there are distinct age clusters to these poorly bleached grains. Analyses were carried out on a compilation of all measured De values (small aliquots) from the entire study area, and for each area separately. Results show that the unbleached grains cluster into only a few periods and highlight four synchronous episodes of terrace building in the past 800 years. The Roman and Early Islamic periods are also represented, even in area where soils with such ages were not found. The unbleached grains preserve older episodes of terrace building no longer represented in the landscape.

  5. 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.

  6. Periglacial cirque analogs: Elevation trends of cryoplanation terraces in eastern Beringia

    Science.gov (United States)

    Nelson, Frederick E.; Nyland, Kelsey E.

    2017-09-01

    Cryoplanation terraces are large erosional landforms common in cold, unglaciated mountainous environments. Terrace sequences are composed of alternating slope segments with gently sloping treads and steep rubble-covered risers, and culminate in extensive summit flats. Many unglaciated upland landscapes in eastern Beringia are dominated by these landforms. Indirect evidence indicates that they evolve through locally intensified weathering and mass-movement processes associated with late-lying snowcover. Geospatial analysis involving nearly 700 cryoplanation terraces in eastern Beringia demonstrates that their elevation rises from 175 to 350 masl on Bering Sea islands to median values > 1200 m near the Alaska-Canada border. The regional trends of cryoplanation terrace elevation are nearly identical to those of Wisconsinan cirques on several transects across Alaska. The consistency in the elevation trends of glacial cirques and cryoplanation terraces indicates close genetic links between the two classes of feature, involving topographic position, continentality gradients, and the mass balance of localized snow accumulations. Cryoplanation terraces can be considered the periglacial analogs of glacial cirques, and have greater potential as sources of paleoclimatic information than smaller periglacial features more sensitive to short-term climate variations. Process-oriented studies, age determinations, and high-resolution mapping are needed before the paleoenvironmental potential of these landforms can be realized fully.

  7. Terrace styles and timing of terrace formation in the Weser and Leine valleys, northern Germany: Response of a fluvial system to climate change and glaciation

    Science.gov (United States)

    Winsemann, Jutta; Lang, Jörg; Roskosch, Julia; Polom, Ulrich; Böhner, Utz; Brandes, Christian; Glotzbach, Christoph; Frechen, Manfred

    2015-09-01

    In glaciated continental basins accommodation space is not only controlled by tectonics and sea-level but also by the position of ice-sheets, which may act as a regional base-level for fluvial systems. Although the Pleistocene terrace record of major river systems in northwestern Europe has been investigated by many authors, relatively little attention has been paid to base-level changes related to glacier advance-retreat cycles and how these regional changes in base-level interacted with river catchment processes. This study provides a synthesis of the stratigraphic architecture of Middle Pleistocene to Holocene fluvial terraces in the upper Weser and middle Leine valley in northern Germany and links it to glaciation, climate and base-level change. The depositional architecture of the fluvial terrace deposits has been reconstructed from outcrops and high-resolution shear wave seismic profiles. The chronology is based on luminescence ages, 230Th/U ages, 14C ages and Middle Palaeolithic archaeological assemblages. The drainage system of the study area developed during the Early Miocene. During the Pleistocene up to 170 m of fluvial incision took place. A major change in terrace style from strath terraces to cut-and-fill terraces occurred during the early Middle Pleistocene before Marine Isotope Stage MIS 12, which may correlate with climate deterioration and the onset of glaciation in northern central Europe. During this time a stable buffer zone was established within which channels avulsed and cut and filled freely without leaving these vertical confines. Climate was the dominant driver for river incision and aggradation, whereas the terrace style was controlled by base-level changes during ice-sheet growth and decay. A major effect of glacio-isostatic processes was the post-Elsterian re-direction of the River Weser and River Leine. The Middle Pleistocene fluvial terraces are vertically stacked, indicating a high aggradation to degradation ratio, corresponding

  8. Spatio-temporal relation between landslide occurrence and abandoned or not maintained agricultural terraces in the Moldavian Plateau, NE Romania

    Science.gov (United States)

    Ciprian Margarint, Mihai; Santangelo, Michele; Niculita, Mihai; Bucci, Francesco

    2016-04-01

    Terraced landscapes are one of the most obvious human-shaped landscapes, mainly used to reduce the negative impact of soil erosion due to uncontrolled runoff and shallow landslides occurrence. Nevertheless, as the recent literature emphasizes, these old best practices can transform into a potential hazard for soil degradation, if not appropriately maintained. In Moldavian Plateau (NE Romania), agricultural terraces were built after the 1960s for landslide, soil erosion and runoff control, mainly in connection with construction of reservoirs, for increasing their operation time. Usually, the slope reduction was obtained by construction of cut-off ditches, hillside ditches, intermittent terraces, bench terraces, broad-based terraces, vineyardand orchard terraces. Due to the dry climatic setting, to the lack of hard rocks for construction, and to the generally light earth moving machinery available for construction, terraces are generally characterized by a small escarpment (0.5m to 1m), and a relatively short lateral extension (5 to 40 m). When the terraces were maintained, the backslope was typically covered with grass. When, after the 1990s, the lands were returned to the initial owners, the vegetation cover of the terraces was no more maintained, and the terraces themselves were progressively abandoned, due to lack of funds. Accurate landslide mapping on high resolution LiDAR DEM derived images, allowed to produce geomorphological inventories in 5 test cases, representative of the whole study area. In each inventory, landslides were classified based on type and relative age based on published classification schemes. We investigate the spatial and temporal relation between landslides occurrence and terraces, based on the spatial interactions of landslides of different ages and terraces. Results reveal that terraces were built, both on landslide-free and landslide-bearing slopes, and that frequently landslides and gullies develop on terraced slopes. Reactivations of

  9. Terrace Geochemistry at the Shiprock, New Mexico, Disposal Site - WM2017-17232 Initial Phase

    Energy Technology Data Exchange (ETDEWEB)

    Kautsky, Mark [USDOE Office of Legacy Management, Washington, DC (United States); Ranalli, Tony [Navarro Research and Engineering, Oak Ridge, TN (United States); Dander, David [Navarro Research and Engineering, Oak Ridge, TN (United States); Miller, David [Navarro Research and Engineering, Oak Ridge, TN (United States)

    2017-03-08

    The objective of this investigation was to identify and differentiate potential non- mill-related water inputs to a shallow terrace groundwater system through the use of aqueous chemical and isotopic tracers at a former uranium- and vanadium-ore processing facility. Terrace groundwater in the vicinity of the Shiprock, New Mexico, site is hypothesized to be largely anthropogenic because natural rates of recharge in the terrace are likely insufficient to sustain a continuous water table in the terrace alluvial system, as observed in several analogue terrace locations east of the site and in response to post-mill dewatering efforts across the site. The terrace is composed of alluvial sand and gravel and weathered and unweathered Mancos Shale. Terrace groundwater exists and flows in the alluvium and to a much less extent in the Mancos Shale. Historical data established that in both the terrace and floodplain below the terrace, mill-derived uranium and sulfate is found primarily in the alluvium and the upper portion of the weathered Mancos Shale. Groundwater extraction is being conducted in the vicinity of former mill operations and in washes and seeps to dewater the formation and remove contamination, thus eliminating these exposure pathways and minimizing movement to the floodplain. However, past and present contribution of non-mill anthropogenic water sources may be hindering the dewatering effort, resulting in reduced remedy effectiveness. Groundwater source signatures can be determined based on chemical and isotopic ratios and are used to help identify and delineate both mill and non-mill water contributions. Aqueous chemical and isotopic tracers, such as 234U/238U activity ratios and uranium concentrations, δ34S sulfate and sulfate concentrations, tritium concentrations, and δ2Hwater and δ18O water are being used in this Phase I study. The aqueous chemical and isotopic analysis has identified areas on the terrace where groundwater is derived from mill

  10. The impact of the streamflow hydrograph on sediment supply from terrace erosion

    Science.gov (United States)

    Higson, John Lee; Singer, Michael Bliss

    2015-11-01

    Sediment supply from banks and terraces has important implications for grain-size distributions in alluvial rivers (and by extension for aquatic habitat), as well as for the delivery of floodplain-stored nutrients and contaminants to the aquatic environment. The interactions between streamflow hydrographs and lateral channel boundary failure control the sediment supply from banks and terraces. However, the relationships between variable flow and discrete sediment supply from catastrophic erosion of lateral boundaries and subsequent mass sediment flux in rivers are not well characterised by existing methods and models that focus only on one of several relevant interrelated processes. In order to improve predictive capability of catastrophic sediment supply from lateral boundaries, we adopt a new approach to modelling the process interactions between stream hydrology, erosion of banks/terraces, and the corresponding discrete supply of sediment to channels. We develop a modelling framework for terrace - channel coupling that combines existing theories of flow through porous media, bank stability, and fractional sediment flux. We demonstrate the utility of this modelling approach by assessing hydrologically driven erosion, evolution of grain size in the channel, and fine sediment flux from a study site along the Yuba River in California over individual flood hydrographs and over decadal historical flow series. We quantify the supply of sediment eroded from a contaminated nineteenth century fan terrace of hydraulic gold mining tailings intersecting the Yuba, and find that a threshold for erosion exists at a stage in the channel in excess of 8 m producing episodic sediment concentrations in excess of 300 mg L-1. The modelling produced erosion and fine sediment pulses from each of three major floods in the past several decades until the flow drops below 500 m3 s-1 and a bed armor layer forms, while no sediment was generated from the terrace during smaller floods. We

  11. Mass movements and infiltration on abandoned terraces in the Iberian Range, Northern Spain

    Science.gov (United States)

    Arnáez, José; Lana-Renault, Noemí; Ruiz-Flaño, Purificación; Pascual, Nuria; Lasanta, Teodoro

    2017-04-01

    Terraced slopes were one of the most common agricultural landscapes in mountain areas of the Mediterranean region. Built to ensure agricultural production, terraces have acted as an effective soil conservation system at both slope and catchment scale. Demographic and socioeconomic changes in the last 60 years in the Mediterranean mountains have led to the abandonment of terraces. The consequent lack of maintenance of such agricultural structures has triggered diverse erosion processes. At the beginning of the 20th century, the upper valleys of the Leza, Jubera and Cidacos rivers, in the Iberian range (northern Spain), held more than 10,000 inhabitants and a cultivated area of 21,021 ha, of which 13,274 ha were farming terraces (63% of the agricultural space). At present, these terraces are abandoned. The most common erosion processes on the walls of abandoned terraces are stone collapses, which leave the riser completely unprotected, and small mass movements. A total amount of 240 terrace failures with mass movement were identified in the 53 studied plots, which means an average number of 4.5 per plot and 10.6 per 100 m of wall. At plot scale, the average volume of debris was 15.1 m3 (33.1 m3 for every 100 m of wall). Soil infiltration capacity and the way the water flows downslope may be the main triggers for mass movements. Rainfall simulations carried out in the study area showed an average infiltration coefficient above 75%. Infiltration coefficients were higher on concave hillslopes (above 85%), probably because the plots in these sectors were intensively tilled in the past, with plowed and permeable anthropogenic soils. The infiltrated water becomes a destabilizing factor for the terrace wall. The lack of deep percolation due to a more impermeable substrate (e.g., the original soil of the slope) favours the accumulation of water within the artificial soil, behind the stone wall. The increasing weight of the material can cause the activation of mass movements

  12. The importance of understanding landscape evolution in studies of terraced agriculture

    Science.gov (United States)

    Ferro-Vazquez, Cruz; Lang, Carol; Kaal, Joeri; Stump, Daryl

    2017-04-01

    Before the invention of modern, large-scale engineering projects, terrace systems were rarely built in single phases of construction, but instead developed gradually, and could even be said to have evolved. Understanding this process of landscape change is therefore important in order to fully appreciate how terrace systems were built and functioned, and is also pivotal to understand how the communities that farmed these systems responded to changes; whether these are changes to the landscape brought about by the farming practices themselves, or changes to social, economic or climatic conditions. With this aim, we studied the historic and extensive terraced landscape at Konso, southwest Ethiopia, combining archaeological stratigraphy, soil micromorphology and geochemistry. Our results demonstrated that erosion has not only been the trigger for the inception of the Konso terraced system but also the foundation of its productivity: it was engineered for taking advantage of erosion by controlling it, first by harvesting soils that had washed into watercourses within irrigable riverside sediment traps, and then by effectively 'repopulating' the denuded hillsides with new soils through the construction of hillside terraces. From this new perspective, soil erosion has been a necessary enemy which, while managed, has constituted an agronomic resource, the system having initially relied on soil erosion to be productive, and the community having apparently only begun constructing terraces in order to protect the productive alluvial fields that were the legacy of that first phase of erosion. Research that takes into account how terrace systems change through time can thus provide important details of whether the function of the system has changed, and can help assess how the legacies of former practices impact current or future cultivation.

  13. Agronomic Challenges and Opportunities for Smallholder Terrace Agriculture in Developing Countries.

    Science.gov (United States)

    Chapagain, Tejendra; Raizada, Manish N

    2017-01-01

    Improving land productivity is essential to meet increasing food and forage demands in hillside and mountain communities. Tens of millions of smallholder terrace farmers in Asia, Africa, and Latin America who earn $1-2 per day do not have access to peer-reviewed knowledge of best agronomic practices, though they have considerable traditional ecological knowledge. Terrace farmers also lack access to affordable farm tools and inputs required to increase crop yields. The objectives of this review are to highlight the agronomic challenges of terrace farming, and offer innovative, low-cost solutions to intensify terrace agriculture while improving local livelihoods. The article focuses on smallholder farmers in developing nations, with particular reference to Nepal. The challenges of terrace agriculture in these regions include lack of quality land area for agriculture, erosion and loss of soil fertility, low yield, poor access to agricultural inputs and services, lack of mechanization, labor shortages, poverty, and illiteracy. Agronomic strategies that could help address these concerns include intensification of terraces using agro-ecological approaches along with introduction of light-weight, low-cost, and purchasable tools and affordable inputs that enhance productivity and reduce female drudgery. To package, deliver, and share these technologies with remote hillside communities, effective scaling up models are required. One opportunity to enable distribution of these products could be to "piggy-back" onto pre-existing snackfood/cigarette/alcohol distribution networks that are prevalent even in the most remote mountainous regions of the world. Such strategies, practices, and tools could be supported by formalized government policies dedicated to the well-being of terrace farmers and ecosystems, to maintain resiliency at a time of alarming climate change. We hope this review will inform governments, non-governmental organizations, and the private sector to draw

  14. Agronomic Challenges and Opportunities for Smallholder Terrace Agriculture in Developing Countries

    Science.gov (United States)

    Chapagain, Tejendra; Raizada, Manish N.

    2017-01-01

    Improving land productivity is essential to meet increasing food and forage demands in hillside and mountain communities. Tens of millions of smallholder terrace farmers in Asia, Africa, and Latin America who earn $1–2 per day do not have access to peer-reviewed knowledge of best agronomic practices, though they have considerable traditional ecological knowledge. Terrace farmers also lack access to affordable farm tools and inputs required to increase crop yields. The objectives of this review are to highlight the agronomic challenges of terrace farming, and offer innovative, low-cost solutions to intensify terrace agriculture while improving local livelihoods. The article focuses on smallholder farmers in developing nations, with particular reference to Nepal. The challenges of terrace agriculture in these regions include lack of quality land area for agriculture, erosion and loss of soil fertility, low yield, poor access to agricultural inputs and services, lack of mechanization, labor shortages, poverty, and illiteracy. Agronomic strategies that could help address these concerns include intensification of terraces using agro-ecological approaches along with introduction of light-weight, low-cost, and purchasable tools and affordable inputs that enhance productivity and reduce female drudgery. To package, deliver, and share these technologies with remote hillside communities, effective scaling up models are required. One opportunity to enable distribution of these products could be to “piggy-back” onto pre-existing snackfood/cigarette/alcohol distribution networks that are prevalent even in the most remote mountainous regions of the world. Such strategies, practices, and tools could be supported by formalized government policies dedicated to the well-being of terrace farmers and ecosystems, to maintain resiliency at a time of alarming climate change. We hope this review will inform governments, non-governmental organizations, and the private sector to draw

  15. Methods for automatic identification and extraction of terraces from high spatial resolution satellite data (China-GF-1

    Directory of Open Access Journals (Sweden)

    Yi Zhang

    2017-03-01

    Full Text Available Terraces are effective measures to control soil and water loss on hillslopes and play significant roles in water storage, soil conservation and increasing of crop yield. With the launch of comprehensive management engineering of transforming slopes into terraces in China, the area of terraces is continuously expanding. To plan for soil and water conservation in a scientific way and ensure rational soil and water conservation measures, it is important to determine a timely and accurate inventory of the spatial distribution of the existing terraces. High-resolution satellite data (China GF-1 was used in this study to automatically identify and extract terraces. The edge characteristics statistics algorithm, template-matching algorithm and the Fourier transformation algorithm were used. The results suggest that the template-matching algorithm, based on high gray features of terraces, has higher identification accuracy and lower extraction miss rate, and is able to determines the complete map spots, which works well for identification and extraction of typical terraces. The Fourier transformation algorithm, based on the texture of the terraces, is easily affected by gray changes on the terrace field surfaces and field ridges and is hardly reliable as a stand-alone technique for terrace identification. In this study, we focused on an area near Hengshan County, Yulin of Shanxi Province, and performed field validation of the terrace automatic identification and extraction algorithms. The results suggest that the accuracy of automatic identification and extraction of the terraces is greater than 80%. The method proposed is helpful to meet the requirements for planning and monitoring soil and water conservation projects.

  16. Spatial analysis of fluvial terraces in GRASS GIS accessing R functionality

    Science.gov (United States)

    Józsa, Edina

    2017-04-01

    Terrace research along the Danube is a major topic of Hungarian traditional geomorphology because of the socio-economic role of terrace surfaces and their importance in paleo-environmental reconstructions. Semi-automated mapping of fluvial landforms from a coherent digital elevation dataset allow objective analysis of hydrogeomorphic characteristics with low time and cost requirements. New results obtained with unified GIS-based algorithms can be integrated with previous findings regarding landscape evolution. The complementary functionality of GRASS GIS and R provides the possibility to develop a flexible terrain analysing tool for the delineation and quantifiable analysis of terrace remnants. Using R as an intermediate analytical environment and visualisation tool gives great added value to the algorithm, while GRASS GIS is capable of handling the large digital elevation datasets and perform the demanding computations to prepare necessary raster derivatives (Bivand, R.S. et al. 2008). The proposed terrace mapping algorithm is based on the work of Demoulin, A. et al. (2007), but it is further improved in the form of GRASS GIS script tool accessing R functionality. In the first step the hydrogeomorphic signatures of the given study site are explored and the area is divided along clearly recognizable structural-morphological boundaries.The algorithm then cuts up the subregions into parallel sections in the flow direction and determines cells potentially belonging to terrace surfaces based on local slope characteristics and a minimum area size threshold. As a result an output report is created that contains a histogram of altitudes, a swath-profile of the landscape, scatter plots to represent the relation of the relative elevations and slope values in the analysed sections and a final plot showing the longitudinal profile of the river with the determined height ranges of terrace levels. The algorithm also produces a raster map of extracted terrace remnants. From this

  17. Quaternary Uplift of Coral Terraces from Active Folding and Thrusting Along the Northern Coast of Timor-Leste

    Science.gov (United States)

    Cox, N. L.; Harris, R.; Merritts, D.

    2006-12-01

    Emergent coral terraces along the northern coast of Timor-Leste, reveal differential vertical strain along the strike of the active Banda arc-continent collision complex. The number of major coral terraces in surveyed profiles increases from 2 to 25 along a coastal distance of 150 km from central to eastern Timor-Leste. Comparison of 8 separate terrace profiles with sea level curves predicts vertical displacement rates that increase eastward from <0.3 to 1.0-1.5 mm/year. This pattern is corroborated by U-series age analyses that document non-linear increases in vertical strain eastward with the uplift rates ranging from <.04 to 2.0 mm/year. U-series ages also indicates the occurrence of both erosional (regressional) and depositional terraces. Two profiles, dominated by erosional terraces, have associated local lower depositional terraces. The erosional terraces are more abundant, but yield apparent lower uplift rates in comparison with the depositional terraces. This occurrence questions the validity of uplift rates obtained by age analysis for the errosional terraces and/or aids in the conclusion that differential vertical strain not only exists with distance between profiles but with time for each profile. We associate active uplift with northward movement along retro- wedge thrust faults that are well documented in seismic reflection profiles adjacent to the north coast of Timor- Leste.

  18. Determining the spacing of ridge terraces on arable land in central and south-western Poland

    Directory of Open Access Journals (Sweden)

    Baryła Anna

    2017-06-01

    Full Text Available The practice of many countries has shown that terraces can significantly prevent land degradation processes such as excessive soil erosion, landslides. Condition is good layout, proper construction, and then proper maintenance. Practical application in many countries showed that terraces can significantly prevent processes leading to the degradation of land, such as the excessive erosion of soils and landslides. The requirement for this is well-planned, adequate construction, and later – proper conservation. In Poland this is a little popular method. In the article, the dorsal spacing terraces were calculated for two catchments – in the central and south-western parts of Poland. Meteorological and soil data were used for Puczniew station (Ner catchment and Boleścin station (Mielnica catchment. Kolmogorov–Smirnov test was performed to assess the compatibility of a given feature with a normal distribution, then the distribution of the probability distribution was developed. For probability 1, 50 and 90% the spacing of terraces was calculated using Ramser and Morgan method. The results obtained were combined with the results from the USLE model. Hydraulic methods have shown greater spacing for the Mielnica catchment (loess soils compared to the Ner basin (clay loam. For the USLE model, the larger spacing was calculated for the Ner basin. From the practical application to the acceptance of land user will be the maximum distance calculated by different methods. The highest terrace spacing values were obtained using the Morgan method for the Mielnica catchment, for the Ner catchment model USLE.

  19. A Small UAV Based Multi-Temporal Image Registration for Dynamic Agricultural Terrace Monitoring

    Directory of Open Access Journals (Sweden)

    Ziquan Wei

    2017-08-01

    Full Text Available Terraces are the major land-use type of agriculture and support the main agricultural production in southeast and southwest China. However, due to smallholder farming, complex terrains, natural disasters and illegal land occupations, a light-weight and low cost dynamic monitoring of agricultural terraces has become a serious concern for smallholder production systems in the above area. In this work, we propose a small unmanned aerial vehicle (UAV based multi-temporal image registration method that plays an important role in transforming multi-temporal images into one coordinate system and determines the effectiveness of the subsequent change detection for dynamic agricultural terrace monitoring. The proposed method consists of four steps: (i guided image filtering based agricultural terrace image preprocessing, (ii texture and geometric structure features extraction and combination, (iii multi-feature guided point set registration, and (iv feature points based image registration. We evaluated the performance of the proposed method by 20 pairs of aerial images captured from Longji and Yunhe terraces, China using a small UAV (the DJI Phantom 4 Pro, and also compared against four state-of-the-art methods where our method shows the best alignments in most cases.

  20. Phenotype diversity analysis of red-grained rice landraces from Yuanyang Hani's terraced fields, China

    Science.gov (United States)

    Li, Lianjie; Cheng, Long

    2017-10-01

    There are many areas in the world have terraced fields, Yuanyang Rani's terraced fields are examples in the world, and their unique ecological diversity is beyond other terraced fields, rice landraces are very rich. In order to provide useful information for protection and utilization of red-grained rice landraces from Rani's terraced fields, 61 red-grained rice landraces were assessed based 20 quantitative traits. Principal component analysis (PCA) suggested that 20 quantitative characters could be simplified to seven principal components, and their accumulative contribution ration amounted to 78.699%. The first principal component (PC1) explained 18.375% of the total variance, which was contributed by filled grain number, 1000-grain weight, spikelets per panicle, secondary branch number, grain length, and grain thickness. PC2 accounted for 16.548% of the variance and featured flag leaf width, flag leaf area, panicle neck length and primary branch number. These traits were the most effective parameters to discriminate individuals. At the request of the proceedings editor and with the approval of all authors, article 040111 titled, "Phenotype diversity analysis of red-grained rice landraces from Yuanyang Hani's terraced fields, China," is being retracted from the public record due to the fact that it is a duplication of article 040110 published in the same volume.

  1. Physical data of soil profiles formed on late Quaternary marine terraces near Santa Cruz, California

    Science.gov (United States)

    Munster, Jennie; Harden, Jennifer W.

    2002-01-01

    The marine terraces in and around Santa Cruz, California, represent a set of well-preserved terraces formed as a product of geology, sea level, and climate. A marine terrace begins as a wave cut platform. Eustatic sea level changes, seacliff erosion, and tectonic uplift work together to generate marine terraces. "When a wave-cut platform is raised (due to tectonic activity) above sea level and cliffed by wave action it becomes a marine terrace" (Bradley, 1957, p. 424). During glacial periods, eustatic sea level is estimated to have dropped by 150 meters (Fairbanks, 1989). Cliff retreat measured from aerial photographs between 1930 and 1980 vary from 0.0 to 0.2 m yr–1 (Best and Griggs, 1991). Estimates of uplift rates along the Santa Cruz coastline vary from 0.10 to 0.48 m kyr–1 (Bradley and Griggs, 1976; Weber and others, 1999). Uplift mechanisms include coseismic uplift associated both with a reverse component of slip on the steeply SW dipping Loma Prieta fault in the restraining bend of the San Andreas Fault and a small component of reverse slip on the steeply SE dipping San Gregorio fault (Anderson and Menking 1994). Previous work studying physical properties on these terraces include Pinney and others (in press) and Aniku (1986) and Bowman and Estrada (1980). Sedimentary deposits of the marine terraces are a mixture of terrestrial and marine sediments but generally consist of a sheet of marine deposits overlying the old platform and a wedge of nonmarine deposits banked against the old sea cliff (Bradley, 1957). Bedrock underlying the terraces in the Santa Cruz area is generally either Santa Margarita Sandstone or Santa Cruz Mudstone. The Santa Margarita Sandstone represents an upper Miocene, transgressive, tidally dominated marine-shelf deposit with crossbedded sets of sand and gravel and horizontally stratified and bioturbated invertebrate-fossils beds (Phillips, 1990). The siliceous Santa Cruz Mudstone, of late Miocene age, conformably overlies the Santa

  2. Vertical slip rates of active faults of southern Albania inferred from river terraces

    Directory of Open Access Journals (Sweden)

    Oswaldo Guzmán

    2014-02-01

    Full Text Available Fluvial terraces of Shkumbin, Devoll, Osum and Vjosa rivers (southern Albania and northwestern Greece are studied in order to quantify the vertical slip rates of the large active faults of the Dinaric-Albanic-Hellenic Alpine fold belt. The spatial and temporal variations of the incision rates along these rivers were estimated from the geomorphological mapping of the Quaternary sediments, the geometry and the dating of the terraces. Eleven terraces levels were identified in Albania from 68 geochronological ages already published or acquired for this work. The five lower terraces of the four studied rivers are well dated (10 new and 23 already published ages. These terraces are younger than 30 ka and their remnants are numerous. Their restoration allows estimating the regional trend of incision rate and the identification of local shifts. We argue that these shifts are linked to the active tectonics when they coincide with the faults already mapped by previous authors. Vertical slip rates for eight active faults in southern Albania are thus estimated for the last 19 ka and vary from ~0.1 to ~2 mm/a. The Lushnje Tepelene Thrust, that extends more than 120 kilometers, has a throw rate that varies from 0.2 to 0.8 mm/a, whereas the active faults of the extensional domain are segmented but are very active, with throw rates reaching locally 2 mm/a.

  3. Sustainability of terraced paddy fields in traditional satoyama landscapes of Japan.

    Science.gov (United States)

    Fukamachi, Katsue

    2017-11-01

    Terraced paddy fields are essential components of the traditional cultural landscape of Japan, the satoyama landscape. They have been sustainably cultivated in a variety of ecological and social environments through time, and are highly valued as local resources with multiple functions. This paper reviews the recent nationwide movement for conservation of satoyama landscapes and shows that over the last decades, the government has increasingly created policies based on national regulation or international frameworks that concern the culture and environment in rural areas. Recent measures for the sustainability of terraced paddy fields do not only focus on rice terraces, but are directed at each satoyama landscape as a whole under careful consideration of how landscape elements are connected while taking into account the unique features of each area. Nevertheless, it has become difficult to ensure the continued use and maintenance of terraced rice paddies both in depopulated and suburban satoyama landscapes. The motivation for conserving satoyama landscapes, including those with terraced rice paddies, can be found in the awareness and appreciation of the unique characteristics of each locality that offer opportunities that can only be experienced in that particular area. A satoyama landscape that offers such opportunities allows continuity of traditional practices while integrating necessary changes. Copyright © 2016 Elsevier Ltd. All rights reserved.

  4. Autogenic entrenchment patterns and terraces due to coupling with lateral erosion in incising alluvial channels

    Science.gov (United States)

    Malatesta, Luca C.; Prancevic, Jeffrey P.; Avouac, Jean-Philippe

    2017-01-01

    The abandonment of terraces in incising alluvial rivers can be used to infer tectonic and climatic histories. A river incising into alluvium erodes both vertically and laterally as it abandons fill-cut terraces. We argue that the input of sediment from the valley walls during entrenchment can alter the incision dynamics of a stream by promoting vertical incision over lateral erosion. Using a numerical model, we investigate how valley wall feedbacks may affect incision rates and terrace abandonment as the channel becomes progressively more entrenched in its valley. We postulate that erosion of taller valley walls delivers large pulses of sediment to the incising channel, potentially overwhelming the local sediment transport capacity. Based on field observations, we propose that these pulses of sediment can form talus piles that shield the valley wall from subsequent erosion and potentially force progressive channel narrowing. Our model shows that this positive feedback mechanism can enhance vertical incision relative to 1-D predictions that ignore lateral erosion. We find that incision is most significantly enhanced when sediment transport rates are low relative to the typical volume of material collapsed from the valley walls. The model also shows a systematic erosion of the youngest terraces when river incision slows down. The autogenic entrenchment due to lateral feedbacks with valley walls should be taken into account in the interpretation of complex-response terraces.

  5. Physical parameters of Fluvisols on flooded and non-flooded terraces

    Science.gov (United States)

    Kercheva, Milena; Sokołowska, Zofia; Hajnos, Mieczysław; Skic, Kamil; Shishkov, Toma

    2017-01-01

    The heterogeneity of soil physical properties of Fluvisols, lack of large pristine areas, and different moisture regimes on non-flooded and flooded terraces impede the possibility to find a soil profile which can serve as a baseline for estimating the impact of natural or anthropogenic factors on soil evolution. The aim of this study is to compare the pore size distribution of pristine Fluvisols on flooded and non-flooded terraces using the method of the soil water retention curve, mercury intrusion porosimetry, nitrogen adsorption isotherms, and water vapour sorption. The pore size distribution of humic horizons of pristine Fluvisols on the non-flooded terrace differs from pore size distribution of Fluvisols on the flooded terrace. The peaks of textural and structural pores are higher in the humic horizons under more humid conditions. The structural characteristics of subsoil horizons depend on soil texture and evolution stage. The peaks of textural pores at about 1 mm diminish with lowering of the soil organic content. Structureless horizons are characterized by uni-modal pore size distribution. Although the content of structural pores of the subsoil horizons of Fluvisols on the non-flooded terrace is low, these pores are represented by biopores, as the coefficient of filtration is moderately high. The difference between non-flooded and flooded profiles is well expressed by the available water storage, volume and mean radius of pores, obtained by mercury intrusion porosimetry and water desorption, which are higher in the surface horizons of frequently flooded Fluvisols.

  6. Assessing the Reliability of Land-Use Data in Slovenia: A Case Study of Terraced Landscapes

    Science.gov (United States)

    Ažman Momirski, Lucija

    2017-10-01

    Land use relates to the exploitation of land through human activity in the landscape. Land use is also one of the best indicators of a landscape’s structure and processes. Land cover comprises manmade surfaces, agricultural areas, forest and semi-natural areas, wetlands, and bodies of water. In Slovenia more than half of the land (63%) is forested. Manmade surfaces represent less than 5%. A large proportion of relatively inaccessible forest is the main reason why society had a less critical impact on forests in the past in Slovenia in comparison to the majority of central European countries. Regarding the high-quality landscape in the country, Slovenia’s natural features are characterized by a mix of forest and farmland. These land categories (i.e., complex cultivation patterns and land principally used for agriculture with significant areas of natural vegetation) cover 23% of Slovenia. Land-use data for farmland are gathered and provided to the relevant institutions by landowners, who are not specialists in land-use data. In addition, land use is only a two-dimensional tool, which does not recognize elevation differences and terraced slopes. Terraced areas are either omitted from the inventory of land-use data because landowners do not report them, or they are included in the inventory because landowners do not realize that their land is not terraced. Consequently, the differences between the official data on vineyards, orchards, and olive groves on terraces and actual terraced slopes with such land use may differ significantly.

  7. Episodic Aggradation and Asynchronous Incision of River Terraces in the Kyrgyz Tien Shan

    Science.gov (United States)

    Burgette, R. J.; Weldon, R. J.; Abdkrakhmatov, K. Y.; Ormukov, C.

    2006-12-01

    Sequences of terraces and alluvial fans with characteristic geomorphic expression lie above or at the mouth of rivers in all of the major basins in the Tien Shan mountains of Kyrgyzstan. The similarity of terraces and fans in different drainage basins, despite being bounded by faults of varying activity and style, has been used to argue for synchronous regional climatic variations controlling the timing of aggradation and incision. Our emerging set of radiocarbon dates (currently 24) from terrace deposits and overlying sediments suggest that despite the general regional synchroneity of a late Pleistocene terrace-forming event, deep incision below broad aggradational surfaces may be locally controlled and occurred over time spans up to 30 k.y. The most prominent intra-canyon terrace is known as QIII(2) in the characteristic sequence of Tien Shan terraces. QIII(2) is a fill terrace everywhere except for the hanging walls of the most active thrust faults in the Tien Shan, where it has a strath terrace morphology. In many places the base of the QIII(2) fill is not visible even at the level of the modern river. Five dates in the fill from the Ak-Terek and Tong Rivers in the Issyk-Kul basin and Kajerty River in the Naryn basin are all >40 Ka, and may be beyond the limit of radiocarbon. The Issyk-Kul basin is occupied by a large lake, which provides additional dating possibilities, while potentially complicating the geomorphic system. In Issyk-Kul dates from sediment overlying the QIII(2) gravel in thick colluvial wedges far from the edge of the riser to lower terraces along the Ak-Terek and Tamga rivers show that at least the highest level of the fill was abandoned by 33-30 Ka. However, the downstream reaches of Issyk- Kul rivers' QIII(2) surfaces clearly remained active through a high stand of the lake that persisted from 38 to 20 Ka. Remnants of terraces with steeper gradients that merge upstream with surfaces inset only a few m into the main QIII(2) post-date the high

  8. Analysis of the Terraced Construction Effect on Ecological  Economic Coordinated Development in the Southwest China

    Directory of Open Access Journals (Sweden)

    Ping Liang

    2014-06-01

    Full Text Available This paper through the correlation analysis and efficiency analysis, studied the differences between slope croplands and terraces on soil, water and fertilizer conservation in Southwest China. Meanwhile, it carried out a quantum chemical calculation of the ecological, economic and social benefits brought to the local Hani residents by terrace construction and concluded that terraced fields can promote the mutual coordination effect of water and fertilizer. Thus, it is beneficial for crop growth and development and increase grain output, to achieve the purpose of efficient water use and stable high yield. The results show that with the improvement of Hani ecological environment and the increase of land utilization, local ecological, economic and social benefits are significantly increased, which has laid a solid foundation for the agricultural industrialization development and implementation of sustainable agricultural development strategy in Hani. And also, it provides guarantee for the ecological, economic and social coordinated development of the county.

  9. Morphotectonic analysis and 10Be dating of the Kyngarga river terraces (southwestern flank of the Baikal rift system, South Siberia)

    Science.gov (United States)

    Arzhannikova, A.; Arzhannikov, S.; Braucher, R.; Jolivet, M.; Aumaître, G.; Bourlès, D.; Keddadouche, K.

    2018-02-01

    The formation of the Baikal rift system basins is controlled by active faults separating each basin from the adjacent horsts. The kinematics of these faults is mainly explored through investigation of complex sequences of the fault-intersecting river terraces that record both tectonic and climatic events. This study focuses on the northern margin of the major Tunka basin that develops south-west of Lake Baikal. The development of the basin is controlled by the segmented Tunka fault. We performed a detailed mapping of the Kyngarga river terraces, the best preserved terraces staircase in Baikal rift system, at their intersection with the Tunka fault. In order to decipher the chronology of seismic events and the slip rates along that segment of the fault, key terraces were dated using in situ produced cosmogenic 10Be. We demonstrate that the formation of the terrace staircase occurred entirely during MIS1-MIS2. The obtained data allowed us to estimate the rate of incision at different stages of the terrace staircase formation and the relationship between the vertical and horizontal slip rates along this sub-latitudinal segment of the Tunka fault making respectively 0.8 and 1.12 mm yr- 1 over the past 12.5 ka. Analysis of the paleoseismology and paleoclimate data together with terrace dating provided the possibility to estimate the influence of tectonic and climatic factors on the terrace formation. Our proposed model of the Kyngarga river terrace development shows that the incisions into terraces T3 and T6 were induced by the abrupt climatic warming episodes GI-1 and GI-2, respectively, whereas terraces T5, T4 and T2 were abandoned due to the vertical tectonic displacement along the Tunka fault caused by coseismic ruptures.

  10. Geomorphometric delineation of floodplains and terraces from objectively defined topographic thresholds

    Science.gov (United States)

    Clubb, Fiona J.; Mudd, Simon M.; Milodowski, David T.; Valters, Declan A.; Slater, Louise J.; Hurst, Martin D.; Limaye, Ajay B.

    2017-07-01

    Floodplain and terrace features can provide information about current and past fluvial processes, including channel response to varying discharge and sediment flux, sediment storage, and the climatic or tectonic history of a catchment. Previous methods of identifying floodplain and terraces from digital elevation models (DEMs) tend to be semi-automated, requiring the input of independent datasets or manual editing by the user. In this study we present a new method of identifying floodplain and terrace features based on two thresholds: local gradient, and elevation compared to the nearest channel. These thresholds are calculated statistically from the DEM using quantile-quantile plots and do not need to be set manually for each landscape in question. We test our method against field-mapped floodplain initiation points, published flood hazard maps, and digitised terrace surfaces from seven field sites from the US and one field site from the UK. For each site, we use high-resolution DEMs derived from light detection and ranging (lidar) where available, as well as coarser resolution national datasets to test the sensitivity of our method to grid resolution. We find that our method is successful in extracting floodplain and terrace features compared to the field-mapped data from the range of landscapes and grid resolutions tested. The method is most accurate in areas where there is a contrast in slope and elevation between the feature of interest and the surrounding landscape, such as confined valley settings. Our method provides a new tool for rapidly and objectively identifying floodplain and terrace features on a landscape scale, with applications including flood risk mapping, reconstruction of landscape evolution, and quantification of sediment storage and routing.

  11. 3-Dimensional Terraced NAND (3D TNAND) Flash Memory-Stacked Version of Folded NAND Array

    Science.gov (United States)

    Kim, Yoon; Cho, Seongjae; Lee, Gil Sung; Park, Il Han; Lee, Jong Duk; Shin, Hyungcheol; Park, Byung-Gook

    We propose a 3-dimensional terraced NAND flash memory. It has a vertical channel so it is possible to make a long enough channel in 1F2 size. And it has 3-dimensional structure whose channel is connected vertically along with two stairs. So we can obtain high density as in the stacked array structure, without silicon stacking process. We can make NAND flash memory with 3F2 cell size. Using SILVACO ATLAS simulation, we study terraced NAND flash memory characteristics such as program, erase, and read. Also, its fabrication method is proposed.

  12. Butagaz: a domestic terrace-heater; Butagaz: un parasol chauffant domestique

    Energy Technology Data Exchange (ETDEWEB)

    Anon.

    2000-01-01

    Butagaz innovates by enlarging to the domestic sector the use of terrace-heaters, until now used only by cafes, hotels and restaurants. An appliance was engineered by Butagaz's R and D team at Rognac, in the South of France. A special attention was made on aesthetics and on some technical innovations: an MFB Acotech burner with metallic fibers, shape of the parabolic reflector, quick coupling system. This appliance is now manufactured by the Belgian company Barbecook. This innovative terrace heater was presented at the poster-communication session, during the last French Gas Congress, by Jean-Philippe Hecq and Stephanie Metairie. We publish this communication below. (authors)

  13. Autogenic terraces and non-linear river incision rates under steady external forcing

    Science.gov (United States)

    Malatesta, Luca C.; Prancevic, Jeffrey P.; Avouac, Jean-Philippe

    2015-04-01

    Fluvial terraces are among the most commonly cited records of hydraulic changes and tectonic events, and researchers often use the timing of their abandonment to constrain regional climatic and tectonic forcings. However, it can be challenging to identify the cause of terrace abandonment, as the same first order signature results from multiple drivers: external forcings of tectonics and climate, and internal autogenic feedbacks. Misinterpretation of the origin of fluvial terraces carries important consequences, as they often are key evidences for geomorphological and tectonic studies. Using a numerical model we identify an autogenic mechanism in transport-limited rivers that produces accelerated incision rates and the abandonment of significant terraces under steady forcing conditions. We show that a 'bank-feedback' process controls the cross-sectional geometry of channel entrenchment through the rising cost of eroding higher banks. During a phase of incision under the forcing of regular discharges (e.g. bankfull floods), an incising alluvial river migrates in a floodplain bound by progressively higher banks. Consequently, the volume of sediment produced by a unit of lateral migration grows larger and eventually forms a talus that may persist for multiple flood events. The talus shields the toe of the bank and prevents lateral erosion while vertical erosion can continue unhindered. This bank-shielding mechanism becomes more effective as vertical erosion creates even higher banks, initiating a feedback that promotes dramatic vertical entrenchment and abandonment of wide terraces. We propose that such a 'bank-feedback' process also plays a large role in determining the source of bedload material by forcing the river to tap into deeper and older sedimentary strata. We compare the 'bank-feedback' mechanism with a well-studied case of the northern piedmont of the East Tian Shan. There, terrace ages documenting >200 m of Holocene river incision, record a fourfold

  14. Changes in hydrological connectivity due to vegetation recovery and wall collapse in abandoned terraced fields

    Science.gov (United States)

    Lana-Renault, Noemí; López-Vicente, Manuel; Oranjuren, Rafael; Ángel Llorente, José; Ruiz-Flaño, Purificación; Arnáez, José

    2017-04-01

    Agricultural terraces have been built in mountain regions worldwide in order to provide a larger surface for cultivation, improve water availability and reduce soil erosion, as they favour infiltration and reduce runoff and sediment connectivity from hillslopes to streams. In many Mediterranean countries, farmland abandonment has led to progressive natural revegetation and, in terraced slopes, due to a lack of maintenance, to a collapse of the water conservation structures, often followed by small mass movements and gullying. Little is known about the effect of such failures on the hydrological system, especially at catchment scale. The aim of this study is to contributing to fill in this gap by exploring the effect of vegetation recovery and terrace failure on hydrological connectivity in a small catchment (192 ha) in northern Spain mostly occupied by abandoned terraced fields. For this purpose, we applied a modified version of the Borselli's index of runoff and sediment connectivity (IC). Besides using the C-RUSLE factor, as used by many authors, we tested the inclusion of an infiltration component (Kf) to assess the landscape-weighting factor. The Kf factor accounted for the high infiltration rates observed in the terraced soils and was estimated using the permeability classes of the K-RUSLE factor. A 2x2 m resolution DEM was used to capture the terraced fields and run the IC model. Following the recommendation of Cavalli et al. (2015), we used the D-infinity flow accumulation algorithm (Tarboton, 1997) to represent the real flow paths, especially on hillslopes, where divergent flow predominates, and on stream channels. To ensure the continuity of the flow path lines, local sinks were filled in with the algorithm of Planchon & Darboux (2001) that preserved a minimum slope gradient of 0.01 degrees. Finally, linear landscape elements such as stonewalls, rock outcrops, and trails and forest roads were also considered. The IC was calculated for the current scenario

  15. Ground-water and drainage problems in the Whitney terrace area, Boise, Idaho

    Science.gov (United States)

    West, S.W.

    1955-01-01

    Ground-water levels in the Whitney terrace area, after many years of rise owing to downward percolation of water from irrigated land, became nearly stabilized by 1935.  Strong seasonal water-level fluctuations of 8 to 10 feet, however, are common in the Boise Valley.  In recent years, the Whitney terrace has been changing rapidly from a farming to an urban community.  The 3,200-acre area now has about 15,000 inhabitants and the land area is about 35-percent occupied by urban developments.  Population trends indicate that urban expansion will continue.  

  16. River terraces as a response to climatic forcing: formation processes, sedimentary characteristics and sites for human occupation

    NARCIS (Netherlands)

    Vandenberghe, J.

    2015-01-01

    Climate impact on the fluvial processes led to morphological and sedimentological differentiation of a terrace. This diversity in the fluvial environment determined how people could adapt to the river. Although the climatic impact on development and initiation of river terraces seems to be well

  17. Environmental factors influencing the distribution of agricultural terraces: Case study of Horny Tisovnik, Slovakia

    Czech Academy of Sciences Publication Activity Database

    Slámová, M.; Krčmářová, Jana; Hrončiek, P.; Kaštierová, M.

    2017-01-01

    Roč. 25, č. 1 (2017), s. 34-45 ISSN 1210-8812 R&D Projects: GA ČR(CZ) GA16-15716S Institutional support: RVO:68378076 Keywords : agricultural terraces * traditional landscapes * environmental history * multivariate analysis * Slovakia Subject RIV: AC - Archeology, Anthropology, Ethnology Impact factor: 2.149, year: 2016

  18. Development of optimal terrace pit coal mining systems. Technical progress report, October 1- October 31, 1979

    Energy Technology Data Exchange (ETDEWEB)

    McIntosh, D. G.

    1979-11-19

    A bibliography on various aspects of optimal terrace pit coal mining systems is included. Relevant federal and state legislation and regulations have been identified. Mines of interest to the project have been identified and listed for field visits. Seven regions of different climates, hydrology, geology, etc., are being studied individually. (LTN)

  19. Late Quaternary fluvial terrace development and changing landscape connectivity in the Great Karoo, South Africa.

    Science.gov (United States)

    Oldknow, Chris; Hooke, Janet

    2017-04-01

    Dendritic channel networks in the Wilgerbosch River catchment draining the south side of the Sneeuberg, South Africa are deeply incised exposing terrace fills of varying thickness and extent. Channel long sections exhibit 'stepped' profiles where resistant rock strata cross valley floors, but are now partially or completely breached. Using a combination of aerial image analyses, geomorphological mapping, sedimentological investigations (field logging, grain size and mineral magnetic analysis) and geochronology (OSL, radiocarbon), this presentation demonstrates the patterns and controls on erosion and sedimentation and to a lesser extent, the age structure of fills in two low-order tributaries (Africanders Kloof and Wilgerbosch Kloof) and several reaches of the higher-order Wilgerbosch River. A conceptual model of terrace development in relation to changing conditions of connectivity was tested. Valley headwaters are dominated by discontinuous palaeochannel and floodout sediments, whilst in 2nd-4th order tributaries, five sedimentologically and stratigraphically distinct terrace fills that exceed the scale and complexity of deposits to the north of the Sneeuberg, were identified and analysed. The early part of this regional terrace succession highlights the importance of interactions between periglacial and fluvial activity on cut, fill and pedogenesis in the deglacial period. Terrace development is shown to have been a complex response to re-connection of the channel network with upland colluvial stores resulting in the valleys becoming choked with sediment. This caused a rise in groundwater and formation of extensive calcretised rootmats on valley floors and slopes acting to 'blanket' terraces 1 and 2. The thickness and longevity of this blanket is shown to restrict depth of incision in subsequent phases (T3, T4). As a result, the stratigraphic record is spatially and temporally biased toward the late Pleistocene and Holocene terraces (1, 2 and 4 respectively

  20. Paleo-Erosion Rates From in Situ 10Be in Middle European River Terrace Sediments

    Science.gov (United States)

    Schaller, M.; von Blanckenburg, F.; von Blanckenburg, F.; Hovius, N.; Kubik, P. W.

    2001-12-01

    Exploiting cosmogenic nuclides in sand of dated river terrace can be used to quantify catchment-wide rates of paleo-erosion. The measured cosmogenic 10Be concentration in quartz is corrected for post-depositional irradiation using the known terrace age. The remaining nuclide inventory is attributed to irradiation in the source area of the sediment. This inventory reflects the catchment-wide erosion rate at the time of terrace deposition. This approach has been used to assess the influence of climate change on erosion in the waning stages of the last cold period. Late Pleistocene to Holocene terraces of the Allier and Dore Rivers, France, yield paleo-erosion rates that range from 30 to 55 mm/kyr. These rates are very similar to recent ones measured with 10Be in sands from the active Allier channel (31 to 59 mm/kyr, Schaller et al., 2001). Rates derived independently from the sedimentary fill of a lake in the upstream area of the Allier catchment show strong fluctuations with an erosion maximum of 120 mm/kyr during the Younger Dryas (Macaire et al., 1997). However, these real variations in erosion rates are strongly dampened in the cosmogenic nuclide record due to the method's slow response time. As a result, the Late Pleistocene erosion signal in the terrace sequence is virtually invariant and is propagated into the Holocene terrace and modern bedload erosion rates. The resulting memory of elevated past erosion rates might explain the difference between modern cosmogenic nuclide-derived and much lower river load gauging-derived erosion rates that was observed in Middle European rivers (Schaller et al., 2001). The analysis of Late Pleistocene to Holocene terrace sediments of the Meuse River, the Netherlands, suggest that cosmogenic nuclide-derived paleo-erosion rates have decreased from 60 mm/kyr in the Late Pleistocene to 23 mm/kyr in Holocene times. The results from these 30 kyr of erosion rate records suggest that individual samples from a given terrace interval

  1. A landscape character assessment of three terraced areas in Campania region, Italy

    Science.gov (United States)

    Gravagnuolo, Antonia; Ronza, Maria; Di Martino, Ferdinando; De Rosa, Fortuna

    2017-04-01

    Agricultural terraces represent the territorial structure of many cultural landscapes in the Campania region, Italy. Historic urban/rural settlements and hydraulic-agrarian systems have been developed on mountains and hills, producing diverse cultural landscapes depending on the specific geological, pedological and geomorphological characteristics, which influenced the character and functions of terraces. These unique landscapes are multi-functional and provide many ecosystem services: provisioning (food, water retention, building materials); regulating and maintenance (hydrogeological stability, soil fertility, protection from soil erosion, maintenance of genetic diversity, habitat); cultural services (heritage and traditional knowledge conservation, tourism and recreation, spiritual experience, education, aesthetic quality). Three terraced landscapes in Campania are analysed, which present a rich diversity in the geological structure and formal/functional characteristics: the Roccamonfina vulcanic area, a highly fertile and lapillous soil; the Monte di Bulgheria, a clay-rich area; and finally the well-known UNESCO World Heritage site of the Amalfi Coast, a calcareous, steep rock faced area. A landscape character assessment of the three sites is processed, identifying the biophysical structure of the sites, natural systems and land use, and cultural and anthropic elements. Terraced landscapes in Campania can be regenerated, taking again an active social and economic role for the society, enhancing their multifunctionality as a key source of wellbeing. Ecosystem services are mapped and evaluated to assess benefits and costs in a multidimensional framework. Spatial analysis in GIS environment supports this process, providing a decision-support tool for mapping and assessment of terraced landscapes, to convert their actual and potential value into a resource of economic sustainable development.

  2. Quantification of the effect of terrace maintenance on soil erosion: two seasons of monitoring experiments in Cyprus

    Science.gov (United States)

    Camera, Corrado; Djuma, Hakan; Zoumides, Christos; Eliades, Marinos; Charalambous, Katerina; Bruggeman, Adriana

    2017-04-01

    In the Mediterranean region, rural communities in topographically challenging sites have converted large areas into dry-stone terraces, as the only way to develop sustainable agriculture. Terraces allow softening the steep mountainous slopes, favoring water infiltration and reducing water runoff and soil erosion. However, population decrease over the past 30 years has led to a lack of maintenance of the terraces and the onset of a process of land degradation. The objective of this study is the quantification of the effect of terrace maintenance on soil erosion. We selected two terraces - A and B, 11 and 14 m long, respectively - for monitoring purposes. They are located in a small catchment (10,000 m2) in the Troodos Mountains of Cyprus, at an elevation of 1,300 m a.s.l., and cultivated with vineyards, which is the main agricultural land use of the region. We monitored soil erosion by means of sediment traps, which are installed along 1-m long sections of terrace. We monitored four sections on terrace A and seven on terrace B. During the first monitoring season (winter 2015/16), on terrace A the traps caught sediment of two collapsed and two standing sections of dry-stone wall. The catchment areas of one set of traps (degraded and non-degraded) were closed by a 1x4-m2 plot, to relate erosion rates to a known draining area. On terrace B the traps were all open and caught four collapsed and three standing sections. Also, we installed a weather station (5-minute rainfall, temperature, and relative humidity) and 15 soil moisture sensors, to relate soil erosion processes with climate and (sub)surface hydrology. From the open traps, we observed that soil loss is on average 8 times higher from degraded terrace sections than from standing, well maintained sections, which in our case study corresponds to an 87% reduction of soil loss due to terrace maintenance. If we compare data from the two closed plots, we obtain a much higher soil loss ratio (degraded/standing) of 56

  3. The River Mondego terraces at the Figueira da Foz coastal area (western central Portugal): Geomorphological and sedimentological characterization of a terrace staircase affected by differential uplift and glacio-eustasy

    DEFF Research Database (Denmark)

    Ramos, Anabela M.; Cunha, Pedro P.; Cunha, Lúcio. S.

    2012-01-01

    Mondego has incised into the Pliocene relief and its long drainage evolution is recorded within a series of inset river terrace landforms. These river terraces are better preserved on the right-hand (northern) bank, where they form a staircase developed against the uplifted Serra da Boa Viagem structure...... of active faults during the Quaternary. The main tectonic structure is the WNW–ESE trending Quiaios fault, responsible for the regional tilting towards SW. Other probably active faults and tectonic lineaments trend NNW–SSE to N–S, NNE–SSW to NE–SW and WNW–ESE. This study reports a long-term uplift rate of 0......-gravels and silts, but also some colluvium at the top of each terrace. The younger terraces (T3, T4 and T5) show better developed sedimentary structures and less sedimentary matrix; the sedimentary features are indicative of both fluvial and coastal environments (estuary and beach, as nowadays). Under conditions...

  4. Characterization of seven United States coal regions. The development of optimal terrace pit coal mining systems

    Energy Technology Data Exchange (ETDEWEB)

    Wimer, R.L.; Adams, M.A.; Jurich, D.M.

    1981-02-01

    This report characterizes seven United State coal regions in the Northern Great Plains, Rocky Mountain, Interior, and Gulf Coast coal provinces. Descriptions include those of the Fort Union, Powder River, Green River, Four Corners, Lower Missouri, Illinois Basin, and Texas Gulf coal resource regions. The resource characterizations describe geologic, geographic, hydrologic, environmental and climatological conditions of each region, coal ranks and qualities, extent of reserves, reclamation requirements, and current mining activities. The report was compiled as a basis for the development of hypothetical coal mining situations for comparison of conventional and terrace pit surface mining methods, under contract to the Department of Energy, Contract No. DE-AC01-79ET10023, entitled The Development of Optimal Terrace Pit Coal Mining Systems.

  5. Methane dissociation on the steps and terraces of Pt(211) resolved by quantum state and impact site.

    Science.gov (United States)

    Chadwick, Helen; Guo, Han; Gutiérrez-González, Ana; Menzel, Jan Paul; Jackson, Bret; Beck, Rainer D

    2018-01-07

    Methane dissociation on the step and terrace sites of a Pt(211) single crystal was studied by reflection absorption infrared spectroscopy (RAIRS) at a surface temperature of 120 K. The C-H stretch RAIRS signal of the chemisorbed methyl product species was used to distinguish between adsorption on step and terrace sites allowing methyl uptake to be monitored as a function of incident kinetic energy for both sites. Our results indicate a direct dissociation mechanism on both sites with higher reactivity on steps than on terraces consistent with a difference in an activation barrier height of at least 30 kJ/mol. State-specific preparation of incident CH4 with one quantum of antisymmetric (ν3) stretch vibration further increases the CH4 reactivity enabling comparison between translational and vibrational activation on both steps and terraces. The reaction is modeled with first principles quantum theory that accurately describes dissociative chemisorption at different sites on the surface.

  6. Terrace Farming on Agricultural Land in the Conterminous United States, 1992: National Resource Inventory Conservation Practice 600

    Data.gov (United States)

    U.S. Geological Survey, Department of the Interior — This data set represents the estimated percentage of the 1-km grid cell that is covered by or subject to the agricultural conservation practice (CP600), Terrace...

  7. Methane dissociation on the steps and terraces of Pt(211) resolved by quantum state and impact site

    Science.gov (United States)

    Chadwick, Helen; Guo, Han; Gutiérrez-González, Ana; Menzel, Jan Paul; Jackson, Bret; Beck, Rainer D.

    2018-01-01

    Methane dissociation on the step and terrace sites of a Pt(211) single crystal was studied by reflection absorption infrared spectroscopy (RAIRS) at a surface temperature of 120 K. The C—H stretch RAIRS signal of the chemisorbed methyl product species was used to distinguish between adsorption on step and terrace sites allowing methyl uptake to be monitored as a function of incident kinetic energy for both sites. Our results indicate a direct dissociation mechanism on both sites with higher reactivity on steps than on terraces consistent with a difference in an activation barrier height of at least 30 kJ/mol. State-specific preparation of incident CH4 with one quantum of antisymmetric (ν3) stretch vibration further increases the CH4 reactivity enabling comparison between translational and vibrational activation on both steps and terraces. The reaction is modeled with first principles quantum theory that accurately describes dissociative chemisorption at different sites on the surface.

  8. CROP YIELDS ALONG THE TOPOSEQUENCE OF TERRACED ANDOSOLS IN NAROK, KENYA

    Directory of Open Access Journals (Sweden)

    Alice Chepkemoi Ruto

    2017-04-01

    Full Text Available The principle objective of terracing is to reduce runoff and soil loss but it also contributes to increasing the soil moisture content through improved infiltration. A field experiment was conducted in Suswa, Narok County during the short and long rain seasons of 2013-2015 to assess the effect of terracing on crop yields. A randomized complete block design was used with maize and beans as the test crops. The study examined maize plant height, leaf area index (LAI, above ground biomass yields, number of bean pods and grain yields in the upper (U, upper middle (UM, middle (M, lower middle (LM and lower (L terrace, slope positions with farmers’ fields where terraces were not maintained were used as the control. The results showed that yields were significantly (PLM>UM>M>U, with values ranging from 7.2 t ha-1 to 3.0 t ha-1 for maize and 1374 kg ha-1 to 306 kg ha-1 for beans. Significant differences (P<0.05 were also observed  according to cropping patterns with CP2 on average recording the highest (803 kg ha-1 bean yields and CP4 (control  the lowest (576 kg ha-1 in season I. CP3 had the highest (4.97 t ha-1 maize yields compared to CP4 (3.25 t ha-1 in season II. From the results of the study, it was possible to conclude that soil conservation measures and cropping patterns implemented at Suswa increased crop yields and the technology should be promoted for improved livelihoods.

  9. River terraces and alluvial fans: The case for an integrated Quaternary fluvial archive

    Science.gov (United States)

    Mather, A. E.; Stokes, M.; Whitfield, E.

    2017-06-01

    The fluvial archive literature is dominated by research on river terraces with appropriate mention of adjacent environments such as lakes. Despite modern sedimentary basins comprising a significant (>88%) volume of distributive fluvial systems, of which alluvial fans (>1 km, dynamic role of alluvial fans within the fluvial landscape and their interaction with river systems, highlighting the potential value of alluvial fans to the wider fluvial archive community. Published literature is used to examine both thematic and geographical based benefits of alluvial fan research that can assist understanding of Quaternary fluvial archives. 3 regional case studies are presented that illustrate the interaction between alluvial fan and river terrace archives at Quaternary time-scales at 3 different stages of landscape evolution. These are i) continuous mountain front alluvial fans interacting with a non incising but laterally eroding axial fluvial system; ii) alluvial fans which transition into fluvial terraces as sedimentary basins shift from net aggradation to net incision and iii) tributary-junction alluvial fans that develop predominantly within incising river valley systems. A simple conceptual model is proposed to summarise the dynamic role of alluvial fans within this landscape context. The alluvial fans act as potential 'buffers' between hillslopes and river terrace records under 'top down' climate-driven high sediment supply and alluvial fan aggradation, and 'couplers' during periods of less sediment (in relation to water) discharge and alluvial fan incision. These dynamics will change with the addition of 'bottom up' controls such as main river incision, which will typically enhance the coupling effect of both systems.

  10. Emergence and detailed structure of terraced surfaces produced by oblique-incidence ion sputtering

    Science.gov (United States)

    Harrison, Matt P.; Pearson, Daniel A.; Bradley, R. Mark

    2017-09-01

    We study the nanoscale terraced topographies that arise when a solid surface is bombarded with a broad ion beam that has a relatively high angle of incidence θ . We find that the surface is not completely flat between the regions in which the surface slope changes rapidly with position: Instead, small-amplitude ripples propagate along the surface. Our analytical work on these ripples yields their propagation velocity as well as the scaling behavior of their amplitude. Our simulations establish that the surfaces exhibit interrupted coarsening, i.e., the characteristic width and height of the surface disturbance grow for a time but ultimately asymptote to finite values as the fully terraced state develops. In addition, as θ is reduced, the surface can undergo a transition from a terraced morphology that changes little with time as it propagates over the surface to an unterraced state that appears to exhibit spatiotemporal chaos. For different ranges of the parameters, our equation of motion produces unterraced topographies that are remarkably similar to those seen in various experiments, including pyramidal structures that are elongated along the projected beam direction and isolated lenticular depressions.

  11. Spatial patterns of (137)Cs inventories and soil erosion from earth-banked terraces in the Yimeng Mountains, China.

    Science.gov (United States)

    Zhang, Yunqi; Long, Yi; An, Juan; Yu, Xingxiu; Wang, Xiaoli

    2014-10-01

    The Yimeng Mountains is one of China's most susceptible regions to soil erosion. In this region, slopes are composed of granite- or gneiss-derived soils that are commonly cultivated using earth-banked terraces. Based on the (137)Cs measurement for nine reference cores, the present study analysed the spatial patterns of (137)Cs inventory and soil erosion using 105 sampling points in a seven-level earth-banked terrace system. The mean (137)Cs inventory, standard deviation, coefficient of variation, and allowable error for the nine reference cores were 987 Bq m(-2), 71 Bq m(-2), 7%, and 6%, respectively, values that may reflect the heterogeneity of the initial (137)Cs fallout deposit. Within each terrace, the (137)Cs inventory generally increases from the rear edge to the front edge, accompanied by a decrease in the erosion rate. This results from planation by tillage and rainfall runoff during the development of the earth-banked terraces. Across the entire seven-level terrace system, (137)Cs inventories decrease from the highest terrace downwards, but increase in the lower terraces, whereas erosion rate displays the opposite trend. These trends are the result of the combined effects of the earth-bank segmented hillslope, the limited protection of the earth banks, and rainfall runoff in combination with tillage. The high coefficients of variation of (137)Cs inventories for the 21 sampling rows, with a mean value of 44%, demonstrate the combined effects of variations in original microtopography, anthropogenic disturbance, the incohesive soils weathered from underlying granite, and the warm climate. Although earth-banked terraces can reduce soil erosion to some extent, the estimated erosion rates for the study area are still very high. Copyright © 2014 Elsevier Ltd. All rights reserved.

  12. Extraction of Terraces on the Loess Plateau from High-Resolution DEMs and Imagery Utilizing Object-Based Image Analysis

    Directory of Open Access Journals (Sweden)

    Hanqing Zhao

    2017-05-01

    Full Text Available Abstract: Terraces are typical artificial landforms on the Loess Plateau, with ecological functions in water and soil conservation, agricultural production, and biodiversity. Recording the spatial distribution of terraces is the basis of monitoring their extent and understanding their ecological effects. The current terrace extraction method mainly relies on high-resolution imagery, but its accuracy is limited due to vegetation coverage distorting the features of terraces in imagery. High-resolution topographic data reflecting the morphology of true terrace surfaces are needed. Terraces extraction on the Loess Plateau is challenging because of the complex terrain and diverse vegetation after the implementation of “vegetation recovery”. This study presents an automatic method of extracting terraces based on 1 m resolution digital elevation models (DEMs and 0.3 m resolution Worldview-3 imagery as auxiliary information used for object-based image analysis (OBIA. A multi-resolution segmentation method was used where slope, positive and negative terrain index (PN, accumulative curvature slope (AC, and slope of slope (SOS were determined as input layers for image segmentation by correlation analysis and Sheffield entropy method. The main classification features based on DEMs were chosen from the terrain features derived from terrain factors and texture features by gray-level co-occurrence matrix (GLCM analysis; subsequently, these features were determined by the importance analysis on classification and regression tree (CART analysis. Extraction rules based on DEMs were generated from the classification features with a total classification accuracy of 89.96%. The red band and near-infrared band of images were used to exclude construction land, which is easily confused with small-size terraces. As a result, the total classification accuracy was increased to 94%. The proposed method ensures comprehensive consideration of terrain, texture, shape, and

  13. Environmental factors influencing the distribution of agricultural terraces: Case study of Horný Tisovník, Slovakia

    Directory of Open Access Journals (Sweden)

    Slámová Martina

    2017-03-01

    Full Text Available The cadastral district of Horný Tisovník represents a traditionally managed Carpathian mountain agricultural landscape with extensive terraces. It was historically governed by two counties with different feudal economic systems - agricultural and industrial. This paper aims to enrich traditional methods in environmental history. We applied geospatial statistics and multivariate data analysis for the assessment of environmental factors influencing the distribution of agricultural terraces. Using linear models, the hypothesis was tested that the terrace distribution is functionally related to selected factors (affiliation to the historic counties; average altitude and slope; distance from water, buildings and settlements; units of natural potential vegetation; and current land use. Significantly greater amounts of terraces were located in the agricultural county compared to the industrial county. A principal component analysis showed the coincidence between the current agricultural land use and higher concentrations of terraces occurring in lower altitudes, closer to settlements and buildings, and within the unit of Carpathian oak-hornbeam forests. These findings regarding the most significant factors influencing the distribution of terraces are used in proposals for incentives to improve the management of the traditional agricultural landscape.

  14. Role of atomic terraces and steps in the electron transport properties of epitaxial graphene grown on SiC

    Directory of Open Access Journals (Sweden)

    H. Kuramochi

    2012-03-01

    Full Text Available Thermal decomposition of vicinal SiC substrates with self-organized periodic nanofacets is a promising method to produce large graphene sheets toward the commercial exploitation of graphene's superior electronic properties. The epitaxial graphene films grown on vicinal SiC comprise two distinct regions of terrace and step; and typically exhibit anisotropic electron transport behavior, although limited areas in the graphene film showed ballistic transport. To evaluate the role of terraces and steps in electron transport properties, we compared graphene samples with terrace and step regions grown on 4H-SiC(0001. Arrays of field effect transistors were fabricated on comparable graphene samples with their channels parallel or perpendicular to the nanofacets to identify the source of measured reduced mobility. Minimum conductivity and electron mobility increased with the larger proportional terrace region area; therefore, the terrace region has superior transport properties to step regions. The measured electron mobility in the terrace region, ∼1000 cm2/Vs, is 10 times larger than that in the step region, ∼100 cm2/Vs. We conclusively determine that parasitic effects originate in regions of graphene that grow over step edges in 4H-SiC(0001.

  15. The evolution of crop cultivation and paleoenvironment in the Longji Terraces, southern China: Organic geochemical evidence from paleosols.

    Science.gov (United States)

    Jiang, Yongjian; Li, Shijie; Chen, Wei; Cai, Desuo; Liu, Yan

    2017-11-01

    The Longji ancient agricultural terraces in the Longji Mountain area (Guilin, southern China), which still remain in use, are famous for their magnificent terraced landscape with a mix of ecosystem and human inhabitation. Previous research has revealed the genesis and preliminary paleoenvironmental record of the agricultural terraces, but little is known about variations in crop cultivation over time. In this study, organic geochemical analyses and radiocarbon dating of an aggradational cultivated soil from a terrace profile were used to explore crop type variation and relevant paleoenvironmental change during the period of cultivation on the Longji Terraces. Hydroponic farming with rice (C 3 ) planting has been the dominant cultivation mode since the initial construction of the terraces. Warm-dry climate contributed to the growth of drought-tolerant crop (C 4 ) cultivation in the late 15th century. Temperature deterioration during the Little Ice Age had a negative impact on dry and hydroponic farming activities from the late 15th century to the late 19th century, while climate warming after the Little Ice Age promoted the redevelopment of hydroponic farming. Copyright © 2016 Elsevier Ltd. All rights reserved.

  16. Quantifying ages of river terraces and basin wide denudation rates in Pamir

    Science.gov (United States)

    Sulaymonova, Vasila A.; Fuchs, Margret C.; Gloaguen, Richard; Merchel, Silke; Rugel, Georg

    2014-05-01

    The Pamir is located at the western edge of the Indian indenter and results from the India-Asia collision. The Pamir also lies at the transition between zones dominated either by the Westerlies or the Indian Summer Monsoon. The ongoing tectonic deformation together with the climatic gradients from the two prevailing atmospheric circulation systems provide a natural laboratory to study surface processes and their rates. To determine and quantify the interaction between tectonics and the drainage system in the Tajik Pamir we use cosmogenic nuclide based techniques. We measured 10Be and 26Al concentrations of modern fluvial sediments sampled from drainage system of Pamirs. Depth profiles enable to determine exposure ages of fluvial terraces, while the modern river sediments reveal basin-wide erosion rates. However, accurate measurement results depend on the quality of the sample preparation. The samples from Pamir contain a high amount of various feldspars that are very difficult to separate from quartz using standard procedures such as magnetic or density separation. Unclean samples cause uncertainties in chemical procedures, especially in the case of combined 10Be and 26Al analysis. We developed a feldspar flotation in addition to our sample preparation procedure that allowed an almost complete separation of the quartz, up to 95%. Several depth profiles were analyzed to determine the exposure age of fluvial terraces. The first results of one terrace along the southern Panj River east of Langar, and one along the Shakhdara River are promising. The AMS results demonstrated that the depth profiles are consistent, with 10Be and 26Al concentrations decreasing with depth. The results of both fluvial terraces show similar denudation rates 0.5mm/yr., while exposure age analysis yields 3.5 ka for the Langar and 19 ka Shakhdara terrace. Further analyses are ongoing. These ages are validated by OSL dates at or nearby the same sites. 10Be denudation rates on modern river

  17. Taxonomic and environmental soil diversity of marine terraces of Gronfjord (West Spitsbergen island)

    Science.gov (United States)

    Alekseev, Ivan; Abakumov, Evgeny

    2017-04-01

    Soil surveys in polar region are faced to problems of soil diagnostics, evolution, geography and pedogenesis with the aim to assess the actual state and future dynamics of soil cover under changing environmental conditions. This investigation is devoted to specification of taxonomic and environmental soil diversity of marine terraces of Gronfjord (Svalbard archipelago, West Spitsbergen Island). It was established 3 key plots (Grendasselva, Aldegonda rivers and marine terrace in surroundings of Barentsburg aerodrome). Soil diagnostics was carried out according to Russian soil classification system and WRB. Grendasselva river valley is characterized by numerous patterned ground elements combined with lichen-moss and moss-lichen patches with sporadic inclusions of higher plants (mostly Lusula pilosa). Soil cover is represented by Typic Cryosols on elevated sites and Histic Gleysols, Turbic Gleysols and Histosols on well-drained boggy sites. Aldegonda river valley characterizes by predominance of entic soils (soil with non-pronounced profile differentiation) on moraine material (mostly Cryic Leptosols). Vegetation is presented by sporadic plant communities comprised by Lusula pilosa and thin lichen-moss ground layer (developed only in well-moistened micro depression). Marine terrace in surroundings of Barentsburg aerodrome is covered by moss-lichen tundra with sporadic inclusions of Lusula pilosa. On the top of the terrace compressed barren circles are quite abundant. Soil catena has been established within this key plot. Soil types are represented by Typic Cryosols in watershed parts of catena, Gleysols and Histic Gleysols in accumulation positions. The active layer depths have been distinguished using vertical electrical sounding. They ranged from 80-90 cm at Grendasselva and Aldegonda river key plot to 140-150 cm at marine terrace in surroundings of Barentsburg aerodrome. Regional differences in this indicator may be explained not only by local differences in

  18. Mapping of buried river terraces on the Kopite Hill, Gerecse Mts., Northern Hungary

    Science.gov (United States)

    Kiss, Dániel; Szőts, Gergely K.; Ruszák, Zsófia; Bereczki, László; Molnár, Gábor; Timár, Gábor; Fodor, László; Csillag, Gábor; Lantos, Zoltán

    2015-04-01

    The Gerecse Mountains is a part of the Transdanubian Mountain Range. The Kopite Hill located on the northern part of the Gerecse Mountains, on the southern side of the Danube and the Hungarian-Slovakian border. At the southern side of the Danube (100 m a.s.l.) a 290 m high hill of Pannonian (Miocene) marine clay, silt and sand can be found. These Pannonian strata are covered with Pliocene-Pleistocene alluvial sediments, loess and travertine. On the Kopite Hill some small outcrops of gravel can be found, which thought to be one of the highest river terrace levels, but it is not proved. To the northwest there is 270-300 m high plateau of the 'Roman-quarry' with a formerly mined travertine-body. According to a recent discovery a Mammoth-tooth and other fossils of mammals were found there, which were dated and correlated. Because the travertine body is at lower height than the assumed terrace level, a maximum rate of uplift can be given. The aim of our fieldwork was to determine the geometry of gravel strata and the connections between the distinct outcrops and the travertine body. We used multielectrode measurements with supplementary VES measurements. We found that on the north side of Kopite Hill and to south from the Roman-quarry there is an almost horizontal 300*100 m large, 8-13 m thick pebble stratum. Direct connection to the travertine body is not possible, because there is a few tens of meters gap between the two bodies, filled with loess. We assume the gravel stratum with its 258-252 m height (gently dips to the south) is a river terrace. On the southest point of this river terrace the thickness of the gravel suddenly increases to 22 meters. To the south there are also some gravel outcrops, and also a drill which suggest that the bottom of these gravels are higher on higher level, about at 265 m a.s.l.. We interpret this phenomenon as a higher terrace level. With the use of geoelectrical methods we could determine the geometry of gravel stratum on the Kopite

  19. Quaternary fans and terraces in the Khumbu Himal south of Mount Everest: their characteristics, age and formation

    Science.gov (United States)

    Barnard, P.L.; Owen, L.A.; Finkel, R.C.

    2006-01-01

    Large fans and terraces are frequent in the Khumbu Himal within the high Himalayan valleys south of Mt. Everest. These features are composed of massive matrix- and clast-supported diamicts that were formed from both hyperconcentrated flows and coarse-grained debris flows. Cosmogenic radionuclide (CRN) exposure ages for boulders on fans and terraces indicate that periods of fan and terrace formation occurred at c. 16, c. 12, c. 8, c. 4 and c. 1.5 ka, and are broadly coincident with the timing of glaciation in the region. The dating precision is insufficient to resolve whether the surfaces formed before, during or after the correlated glacial advance. However, the sedimentology, and morphostratigraphic and geomorphological relationships suggest that fan and terrace sedimentation in this part of the Himalaya primarily occurs during glacier retreat and is thus paraglacial in origin. Furthermore, modern glacial-lake outburst floods and their associated deposits are common in the Khumbu Himal as the result of glacial retreat during historical times. We therefore suggest that Late Quaternary and Holocene fan and terrace formation and sediment transfer are probably linked to temporal changes in discharge and sediment load caused by glacier oscillations responding to climate change. The timing of major sedimentation events in this region can be correlated with fans and terraces in other parts of the Himalaya, suggesting that major sedimentation throughout the Himalaya is synchronous and tied to regional climatic oscillations. Bedrock incision rates calculated from strath terrace ages average c. 3.9 mm a−1, suggesting that the overall rate of incision is set by regional uplift.

  20. Fluvial terrace formation in the lower Awhea and Pahaoa River valleys, New Zealand: implications for tectonic and sea-level controls

    Science.gov (United States)

    Litchfield, Nicola J.; Clark, Kate J.

    2015-02-01

    Altitudes and ages of fluvial terraces along the lower Awhea and Pahaoa River valleys are compared with the altitudes and ages of Holocene marine deposits and terraces in the actively uplifting southern Hikurangi Margin, New Zealand. From these, we infer fluvial terrace formation processes and examine implications for controls on river behaviour and the likely mechanism of uplift. Both river valleys contain a prominent fill terrace (PgT) radiocarbon dated at 10,000-8000 cal. y BP, which formed in response to the rapid estuary infilling during the late stage of post-glacial sea-level rise. Older and younger terraces are primarily degradation terraces, with the exception of the oldest terraces mapped, which are fill terraces inferred to date from the Last Glacial Coldest Period. These results show the Awhea and Pahaoa Rivers respond to a number of competing controls including climate, tectonics, sea-level and anthropogenic (land use) changes, gradient and valley width. The influence of tectonic uplift can be isolated and Holocene marine terraces, estuarine deposits and the PgT tread altitudes are used to constrain the single-event displacement and slip rate of the submarine Palliser-Kaiwhata Fault, of 2-5 m and 2.5 ± 1 mm/y, respectively. The results also provide insight into likely future response of rivers such as the Awhea and Pahaoa to sea-level rise and tectonic uplift.

  1. Raised marine terraces in the Northern Calabrian Arc (Southern Italy: a ~ 600 kyr-long geological record of regional uplift

    Directory of Open Access Journals (Sweden)

    L. Cucci

    2004-06-01

    Full Text Available The Sibari Plain in the Northeastern Calabrian Arc displays a well-developed suite of marine terraces. This paper deals with i the identification and correlation of the terraces; ii their age assignment and a tentative reconstruction of the uplift history of the area; iii the relationships between terraces and major faults in the study area and between uplift in the Plain and pattern of Quaternary uplift throughout the Calabrian Arc. Identifying wavecut platforms and inner-edge fragments over a linear extent of ~ 100 km was achieved by photo interpretation, 1:25 000 scale map analyses and field survey. Morphological evidence led to the correlation of the identified fragments into five complete strandlines (numbered #1 to #5 lowest to highest, at elevations ranging from 60 m to ~ 650 m. Analysis of two parameters of the emerged platform-cliff systems, namely the platform-cliff ratio and the dissection percentage, further testifies that the two lowest terraces are strongly correlative. A 130 kyr AAR age of in situ fossil samples of Glycymeris collected at 114 m elevation within the deposit of Terrace #2 indicates a key correlation of T#2 with MIS 5.5 (the peak of the last interglacial, 124 kyr, i.e. an uplift rate of ~ 0.98 mm/yr for this strandline. The other four terraces have been tentatively associated with MIS 5.3, 7, 9 and 15. Geological observations independent of geochronological evidence provide consistent lower age boundaries for the terraces and supply further constraints to this interpretation. Investigating the relations between setting of the terraces and location of major tectonic structures in the region is suggestive of no recent activity of two previously recognized faults, the «Sangineto Line» and the «Corigliano-Rossano Line». Instead, some limited anomalies that affect the terraces are tentatively associated with the activity of the Castrovillari Fault. Therefore, sustained uplift has been the long-term dominant

  2. Correlation functions in an exactly solvable terrace-ledge-kink model

    CERN Document Server

    Abraham, D B; Latremoliere, F T

    1999-01-01

    We solve exactly a terrace-ledge-kink (TLK) model describing a vicinal section of a crystal surface at a microscopic level, with either repulsive or attractive interactions between the ledges. As expected there is a faceting, or reconstructive, phase transition, driven either by temperature or by the chemical potential, that controls the mean slope of the surface. In the rough phase we carry out a thorough investigation of microscopic thermal fluctuations of the interface. This is done by combining Bethe ansatz and Conformal Field Theory methods in order to calculate appropriately defined correlators.

  3. Autocatalytic surface hydroxylation of MgO(100) terrace sites observed under ambient conditions

    DEFF Research Database (Denmark)

    Newberg, J.T.; Mysak, E.R.; Bluhm, H.

    2011-01-01

    We have investigated the reaction of water vapor with the MgO(100) surface using ambient pressure X-ray photoelectron spectroscopy (AP-XPS), which permits the study of the chemical composition of the MgO/water vapor interface at p(H2O) in the Torr range. Water dissociation on thin MgO(100) films...... interacting with a fully hydroxylated interface on MgO(100). The observed onset of hydroxylation near 0.01% RH is suggested to be due to water molecules aggregating at the surface, leading to an autocatalytic dissociation of water at MgO(100) terrace sites....

  4. Soil-plant mercury concentrations in the Idrijca river terraces (Slovenia)

    OpenAIRE

    Mateja Gosar

    2004-01-01

    The subjects of research are mercury contents in plants and soils on river terraces in the lower reaches of the Idrijca River. Samples of averaged meadow forage and plaintain (Plantago lanceolata) contain from 0.055 to 0.220 mg Hg/kg in dry matter. In comparison to samples from Idrija in the 1970's these contents are relatively low with respect to mercury in soil. They are similar to those established in the surroundings of the abandoned Podljubelj mercury mine. However, with respect to conte...

  5. Linking terrace geomorphology and canopy characteristics in the Peruvian Amazon using high resolution airborne remote sensing (Invited)

    Science.gov (United States)

    Chadwick, K.; Asner, G. P.

    2013-12-01

    The Peruvian Amazon is home to over half a million square kilometers of forest, nearly three quarters of which is supported by terrace landforms with variable histories. Characteristics of these terrace ecosystems have been contrasted with neighboring floodplain systems along riverine transportation corridors, but the ecological complexity within these terrace landscapes has remained largely unexplored. Airborne remote measurements provide an opportunity to consider the relationship between forest canopy characteristics and geomorphic gradients at high resolution over large spatial extents. In 2011 the Carnegie Airborne Observatory (CAO) was used to map a large section of intact lowland humid tropical forest in the southwestern Peruvian Amazon, including over nine thousand hectares of terrace forest. The CAO collected high-fidelity imaging spectroscopy data with its Visible-Shortwave Imaging Spectrometer (VSWIR) and digital elevation and canopy structure data with its high-resolution dual waveform LiDAR. These data, supplemented with field data collection, were used to quantify relationships between forest canopy traits and geomorphic gradients. Results suggest that both spectral properties of the canopy with known relationships to canopy chemistry, including pigment and nutrient concentrations, and canopy structural traits, including vegetation height and leaf area, are associated with geomorphic characteristics of this terrace landscape.

  6. River terrace development in the NE Mediterranean region (Syria and Turkey): Patterns in relation to crustal type

    Science.gov (United States)

    Bridgland, David R.; Demir, Tuncer; Seyrek, Ali; Daoud, Mohamad; Abou Romieh, Mohammad; Westaway, Rob

    2017-06-01

    It is widely recognized that the optimal development of river terraces globally has been in the temperate latitudes, with NW and Central Europe being areas of particular importance for the preservation of such archives of Quaternary environmental change. There is also a growing consensus that the principal drivers of terrace formation have been climatic fluctuation against a background of progressive (but variable) uplift. Nonetheless river terraces are widely preserved in the Mediterranean region, where they have often been attributed to the effects of neotectonic activity, with a continuing debate about the relative significance of fluctuating temperature (glacials-interglacials) and precipitation (pluvials-interpluvials). Research in Syria and southern-central Turkey (specifically in the valleys of the Tigris and Ceyhan in Turkey, the Kebir in Syria and the trans-border rivers Orontes and Euphrates) has underlined the importance of uplift rates in dictating the preservation pattern of fluvial archives and has revealed different patterns that can be related to crustal type. The NE Mediterranean coastal region has experienced unusually rapid uplift in the Late Quaternary. The relation between the Kebir terraces and the staircase of interglacial raised beaches preserved along the Mediterranean coastline of NW Syria reinforces previous conclusions that the emplacement of the fluvial terrace deposits in the Mediterranean has occurred during colder climatic episodes.

  7. Do agricultural terraces and forest fires recurrence in Mediterranean afforested micro-catchments alter soil quality and soil nutrient content?

    Science.gov (United States)

    E Lucas-Borja, Manuel; Calsamiglia, Aleix; Fortesa, Josep; García-Comendador, Julián; Gago, Jorge; Estrany, Joan

    2017-04-01

    Bioclimatic characteristics and intense human pressure promote Mediterranean ecosystems to be fire-prone. Afforestation processes resulting from the progressive land abandonment during the last decades led to greater biomass availability increasing the risk of large forest fires. Likewise, the abandonment and lack of maintenance in the terraced lands constitute a risk of land degradation in terms of soil quantity and quality. Despite the effects of fire and the abandonment of terraced lands on soil loss and physico-chemical properties are identified, it is not clearly understood how wildfires and abandonment of terraces affect soil quality and nutrients content. Microbiological soil parameters and soil enzymes activities are biomarkers of the soil microbial communitýs functional ability, which potentially enables them as indicators of change, disturbance or stress within the soil community. The objective of this study was to investigate the effects of terracing (abandoned and non-abandoned) on the soil enzyme activities, microbiological soil parameters and soil nutrients dynamics in three Mediterranean afforested micro-catchments (i.e., abandonment and the lack of terraced management. In addition, forest fire recurrence exacerbates soil degradation processes due to the direct effects on vegetation and soil properties.

  8. Comparative analysis of the performance of mixed terraces and level and graded terraces=Análise comparativa do desempenho de terraços mistos com terraços em nível e com gradiente

    Directory of Open Access Journals (Sweden)

    Danilo Paulúcio da Silva

    2012-10-01

    Full Text Available The terracing of agricultural land is the most widespread mechanical practice used among farmers in the control of water erosion. The objective of this paper was to carry out a comparative analysis between mixed terraces and level and graded terraces. The dimensioning of level terraces was carried out based on the surface runoff volume, while the graded terrace dimensions were based on the maximum runoff flow rate. For the mixed terraces, the dimensioning was carried by considering two surface runoff hydrographs, one for the determination of the terrace channel capacity and another to estimate the flow rate at the extremity of the terrace channel. Therefore, in order to contain and transport the excess volume, an additional value was calculated and added to the depth of the channel. A case study was performed for the Uberaba, Minas Gerais State (Brazil rainfall conditions, considering events with return periods of 10, 30, and 50 years. The obtained results provided quantitative evidence that mixed terraces have a lower height than level terraces and a higher level than the graded terraces, resulting in direct consequences for the soil movement for the terrace construction.O terraceamento de terras agrícolas consiste na prática mecânica mais difundida entre os agricultores no controle da erosão hídrica. O objetivo deste trabalho foi proceder a análise comparativa do desempenho de terraços mistos com terraços em nível e com gradiente. O dimensionamento de terraços em nível foi feito com base no volume de escoamento superficial, enquanto o de terraços com gradiente foi baseado na vazão máxima de escoamento superficial. Para o dimensionamento de terraços mistos são utilizados dois hidrogramas de escoamento superficial, sendo um para a determinação da capacidade de armazenamento do terraço e o outro para a estimativa da vazão que escoa na extremidade do canal do terraço. Assim, de maneira a conter e transportar o excesso de

  9. High electrochemical selectivity of edge versus terrace sites in two-dimensional layered MoS2 materials.

    Science.gov (United States)

    Wang, Haotian; Zhang, Qianfan; Yao, Hongbin; Liang, Zheng; Lee, Hyun-Wook; Hsu, Po-Chun; Zheng, Guangyuan; Cui, Yi

    2014-12-10

    Exploring the chemical reactivity of different atomic sites on crystal surface and controlling their exposures are important for catalysis and renewable energy storage. Here, we use two-dimensional layered molybdenum disulfide (MoS2) to demonstrate the electrochemical selectivity of edge versus terrace sites for Li-S batteries and hydrogen evolution reaction (HER). Lithium sulfide (Li2S) nanoparticles decorates along the edges of the MoS2 nanosheet versus terrace, confirming the strong binding energies between Li2S and the edge sites and guiding the improved electrode design for Li-S batteries. We also provided clear comparison of HER activity between edge and terrace sites of MoS2 beyond the previous theoretical prediction and experimental proof.

  10. Single-grain and multi-grain OSL dating of river terrace sediments in the Tabernas Basin, SE Spain

    DEFF Research Database (Denmark)

    Geach, M.R.; Thomsen, Kristina Jørkov; Buylaert, Jan-Pieter

    2015-01-01

    River terraces represent important records of landscape response to e.g. base-level change and tectonicmovement. Both these driving forces are important in the southern Iberian Peninsula. In this study,Optically Stimulated Luminescence (OSL) dating was used to date two principal river terraces...... in theTabernas Basin, SE Spain. A total of 23 samples was collected from the fluvial terraces for dating usingquartz OSL. Sixteen of the samples could not be dated because of low saturation levels (e.g. typical2xD0 ... usingboth multi-grain and single-grain analysis. Single grain results show that: (i) measurements from multigrainaliquots overestimate ages by up to ~ 4 ka for modern analogues and young samples (

  11. Geomorphological implications of systematic age overestimations in the OSL dating of post-LGM fluvial terraces (Rangitikei river, New Zealand)

    Science.gov (United States)

    Rieser, U.; Bonnet, S.; Moulin, L.; Lacoste, A.; Lague, D.; Davy, P.

    2009-12-01

    Along the Rangitikei river flows (North Island, New Zealand), a widespread climatically-controlled fluvial terrace formed from ~30 ka to the Last Glacial Maximum. At that time, the river had a braided course and was aggrading. Since the LGM, the river has cut into the bedrock and the LGM terrace is presently preserved 75 m above the current level of the river. The post-LGM entrenchment is characterized by the formation of bedrock gorges with near-vertical valley walls, while the river was meandering. There, some minor, autocyclic fluvial terraces have been abandoned during downcutting and the flight of up to 22 post-LGM terraces is observed locally. The mapping and elevation survey of 376 LGM and post-LGM terraces highlight a bimodal elevation distribution of post-LGM terraces and the lack of post-LGM terraces within the elevation range between 20 and 50 m above the current level of the river. Optically Simulated Luminescence dating has been used to estimate the deposition age of 20 post-LGM strath terrace deposits (feldspars/polymineral silt samples with the aim to constrain in details the post-LGM incision of the river. We used Multiple Aliquot Additive Dose technique with late-light subtraction or Single Aliquot Regenerative (SAR) protocol. 19 samples give an age older than the LGM, which is the maximum age possible for these terraces. It implies a systematic overestimation of the ages. Overestimation is confirmed by the OSL dating of present-day river sediments and of sediments deposited during a major flood that occurred in 2004, whose measured ages are of 37.4 +/- 3.1 and 55.1 +/- 3.5 ka respectively. The elevation distribution of all the ages shows that overestimation is not randomly distributed: from the elevation of the LGM terrace (+75 m) to the current level of the river, all the ages align along a curve with a boomerang shape ( > ). The elevation of the older measured ages (104.4 +/- 7.7 and 106.5 +/- 7.6 ka; elevations of +30 and +20 m respectively

  12. Atomic step-and-terrace surface of polyimide sheet for advanced polymer substrate engineering

    Science.gov (United States)

    Tan, G.; Shimada, K.; Nozawa, Y.; Kaneko, S.; Urakami, T.; Koyama, K.; Komura, M.; Matsuda, A.; Yoshimoto, M.

    2016-07-01

    Typical thermostable and flexible polyimide polymers exhibit many excellent properties such as strong mechanical and chemical resistance. However, in contrast to single-crystal substrates like silicon or sapphire, polymers mostly display disordered and rough surfaces, which may result in instability and degradation of the interfaces between thin films and polymer substrates. As a step toward the development of next-generation polymer substrates, we here report single-atom-layer imprinting onto the polyimide sheets, resulting in an ultrasmooth 0.3 nm high atomic step-and-terrace surface on the polyimides. The ultrasmooth polymer substrates are expected to be applied to the fabrication of nanostructures such as superlattices, nanowires, or quantum dots in nanoscale-controlled electronic devices. We fabricate smooth and atomically stepped indium tin oxide transparent conducting oxide thin films on the imprinted polyimide sheets for future use in organic-based optoelectronic devices processed with nanoscale precision. Furthermore, toward 2D polymer substrate nanoengineering, we demonstrate nanoscale letter writing on the atomic step-and-terrace polyimide surface via atomic force microscopy probe scratching.

  13. Electrical resistivity and spatial variation in agriculture terraces: statistical correlation between ert and flow direction algorithms

    Directory of Open Access Journals (Sweden)

    Fernandes J.

    2017-02-01

    Full Text Available The construction of earthen embankment terraces in the Douro Region raises a set of problems related to hydrological processes. The main objective of this study is the evaluation of the spatial variation of electrical resistivity in agriculture terraces at Douro valley (Portugal. To achieve this objective, two variables are analysed, the soil electrical resistivity and the flow direction algorithm. In a field survey we recorded 13 electrical resistivity profiles. The contributing area was calculated with the algorithms D∞ (Deterministic Infinity Flow and MFD (Multiple Flow Direction and the results are the base of the internal runoff modelling, both supported by the digital elevation model with a spatial resolution of 1m2. A correlation between the spatial variation of the soil electrical resistivity represented by the standard deviation of the electrical resistivity for each profile and the average value of the contributing area coincident with each profile was established. The electrical resistivity standard deviation seems to be moderately well correlated according to the D∞ algorithm at about 1m of depth, and it has a good correlation at 1,5m to 2m of depth with the MFD algorithm. Taken together, the results show a significant positive statistical correlation between the electrical resistivity standard deviation and the contributing areas (MFD and D∞ depending on the soil depth.

  14. Seismic Hazards Implications of Uplifted Pleistocene Coral Terraces in the Gulf of Aqaba.

    Science.gov (United States)

    Bosworth, W; Montagna, P; Pons-Branchu, E; Rasul, N; Taviani, M

    2017-02-24

    The Gulf of Aqaba transform plate boundary is a source of destructive teleseismic earthquakes. Seismicity is concentrated in the central sub-basin and decreases to both the north and south. Although principally a strike-slip plate boundary, the faulted margins of the Gulf display largely dip-slip extensional movement and accompanying footwall uplift. We have constrained rates of this uplift by measurements of elevated Pleistocene coral terraces. In particular the terrace that formed during the last interglacial (~125 ka) is found discontinuously along the length of the Gulf at elevations of 3 to 26 m. Global sea level was ~7 m higher than today at 125 ka indicating net maximum tectonic uplift of ~19 m with an average rate of ~0.015 cm/yr. Uplift has been greatest adjacent to the central sub-basin and like the seismicity decreases to the north and south. We suggest that the present pattern of a seismically active central region linked to more aseismic areas in the north and south has therefore persisted for at least the past 125 kyr. Consequently the potential for future destructive earthquakes in the central Gulf is greater than in the sub-basins to the north and south.

  15. Sr-Isotope record of Quaternary marine terraces on the California coast and off Hawaii

    Science.gov (United States)

    Ludwig, K. R.; Muhs, D.R.; Simmons, K.R.; Moore, J.G.

    1992-01-01

    Strontium-isotopic ratios of dated corals have been obtained from submerged reefs formed during Quaternary glacial periods off the Hawaiian islands. These data, combined with data from deep-sea sediments, tightly constrain the secular variation of marine 87Sr 86Sr for the past 800,000 yr. Although long-term trends are apparent, no significant (>0.02???), rapid (<100,000 yr) excursions in 87Sr 86Sr were resolved nor did we observe any samples with 87Sr 86Sr greater than that of modern seawater. Strontium in mollusks from elevated marine terraces formed during interglacial periods on the southern California coast show resolvable and consistent variations in 87Sr 86Sr which, when compared to the trend of Quaternary marine 87Sr 86Sr, can be used to infer uplift rates and define approximate ages for the higher terraces. The Sr-isotope age estimates indicate that uplift rates vary among crustal blocks and were not necessarily constant with time. No contrast in Sr-isotopic ratios between similar-age Hawaiian and California fossils was observed, confirming that any change in marine 87Sr 86Sr from glacial to interglacial periods must be small. A realistic appraisal of the potential of Sr-isotope stratigraphy for chronometric applications in the Quaternary suggests that the technique will be limited to relatively coarse distinctions in age. ?? 1992.

  16. Comparing OSL and CN techniques for dating fluvial terraces and estimating surface process rates in Pamir

    Science.gov (United States)

    Fuchs, Margret; Gloaguen, Richard; Pohl, Eric; Sulaymonova, Vasila; Merchel, Silke; Rugel, Georg

    2014-05-01

    The quantification of surface process rates is crucial for understanding the topographic evolution of high mountains. Spatial and temporal variations in fluvial incision and basin-wide erosion enable to decipher the role of tectonic and climatic drivers. The Pamir is peculiar in both aspects because of its location at the western end of the India-Asia collision zone, and its position at the edge of two atmospheric circulation systems, the Westerlies and the Indian Summer Monsoon. The architecture of the Panj river network indicates prominent variations across the main tectonic structures of the Pamir. The trunk stream, deflects from the predominantly westward river orientation and cuts across the southern and central Pamir domes before doubling back to the west and leaving the orogen. Optically stimulated luminescence (OSL) dating of fluvial terraces reveals short-term sedimentation along the trunk stream during the last ~25 kyr. The agreement of OSL results to new exposure ages based on the cosmogenic nuclide (CN) 10Be confirms accurate terrace age modelling and treatment of incomplete bleaching. The consistent terrace sedimentation and exposure ages suggest also fast terrace abandonment and rapid onset of incision. Considerable differences in terrace heights reflect high spatial variations of fluvial incision, independent of time interval, change in rock type or catchment increase. Highest rates of (5.9 ± 1.1) mm/yr to (10.0 ± 2.0) mm/yr describe the fluvial dynamic across the Shakhdara Dome and that related to the Darvaz Fault Zone. Lower rates of (3.9 ± 0.6) mm/yr to (4.5 ± 0.7) mm/yr indicate a transient stage north of the Yazgulom Dome. Fluvial incision decreases to rates ranging from (1.7 ± 0.3) mm/yr to (3.9 ± 0.7) mm/yr in graded river reaches associated to southern dome boundaries. The pattern agrees to the interpretation of successive upstream river captures across the southern and central Pamir domes inferred from morphometric analyses of river

  17. Late Quaternary stream piracy and strath terrace formation along the Belle Fourche and lower Cheyenne Rivers, South Dakota and Wyoming

    Science.gov (United States)

    Stamm, John F.; Hendricks, Robert R.; Sawyer, J. Foster; Mahan, Shannon A.; Zaprowski, Brent J.; Geibel, Nicholas M.; Azzolini, David C.

    2013-09-01

    Stream piracy substantially affected the geomorphic evolution of the Missouri River watershed and drainages within, including the Little Missouri, Cheyenne, Belle Fourche, Bad, and White Rivers. The ancestral Cheyenne River eroded headward in an annular pattern around the eastern and southern Black Hills and pirated the headwaters of the ancestral Bad and White Rivers after ~ 660 ka. The headwaters of the ancestral Little Missouri River were pirated by the ancestral Belle Fourche River, a tributary to the Cheyenne River that currently drains much of the northern Black Hills. Optically stimulated luminescence (OSL) dating techniques were used to estimate the timing of this piracy event at ~ 22-21 ka. The geomorphic evolution of the Cheyenne and Belle Fourche Rivers is also expressed by regionally recognized strath terraces that include (from oldest to youngest) the Sturgis, Bear Butte, and Farmingdale terraces. Radiocarbon and OSL dates from fluvial deposits on these terraces indicate incision to the level of the Bear Butte terrace by ~ 63 ka, incision to the level of the Farmingdale terrace at ~ 40 ka, and incision to the level of the modern channel after ~ 12-9 ka. Similar dates of terrace incision have been reported for the Laramie and Wind River Ranges. Hypothesized causes of incision are the onset of colder climate during the middle Wisconsinan and the transition to the full-glacial climate of the late-Wisconsinan/Pinedale glaciation. Incision during the Holocene of the lower Cheyenne River is as much as ~ 80 m and is 3 to 4 times the magnitude of incision at ~ 63 ka and ~ 40 ka. The magnitude of incision during the Holocene might be due to a combined effect of three geomorphic processes acting in concert: glacial isostatic rebound in lower reaches (~ 40 m), a change from glacial to interglacial climate, and adjustments to increased watershed area resulting from piracy of the ancestral headwaters of the Little Missouri River.

  18. Alluvial terrace development and changing landscape connectivity in the Great Karoo, South Africa. Insights from the Wilgerbosch River catchment, Sneeuberg

    Science.gov (United States)

    Oldknow, Christopher J.; Hooke, Janet M.

    2017-07-01

    Dendritic channel networks in the Wilgerbosch River catchment draining the south side of the Sneeuberg, South Africa, are deeply incised exposing terrace fills of varying thickness and extent. Channel long sections exhibit 'stepped' profiles where resistant rock strata cross valley floors but are now partially or completely breached. Using a combination of aerial image analysis, geomorphological mapping, sedimentological investigations (field logging, grain size, and magnetic susceptibility analyses), and geochronology (OSL, 14C), this study demonstrates the patterns and controls on erosion and sedimentation and, to a lesser extent, the age structure of fills in two low-order tributaries (Africanders Kloof and Wilgerbosch Kloof) and several reaches of the higher-order Wilgerbosch River. A conceptual model of terrace development in relation to changing conditions of connectivity is presented. Valley headwaters are dominated by discontinuous palaeochannel and floodout sediments; whilst in second- to fourth-order tributaries, four sedimentologically and stratigraphically distinct terrace fills that exceed the scale and complexity of deposits on the northward side of the Sneeuberg were identified and analysed. The early part of this regional terrace succession highlights the importance of interactions between periglacial and fluvial activity on cut, fill, and pedogenesis around the time of the deglacial period. Terrace development is shown to have been a complex response to reconnection of the channel network with upland colluvial stores resulting in the valleys becoming choked with sediment. This caused a rise in groundwater and formation of extensive calcretised rootmats on valley floors and slopes acting to 'blanket' terraces 1 and 2. The thickness and longevity of this blanket is shown to restrict depth of incision in subsequent phases (T3, T4). The deposits in these headwater valleys have, until now, been overlooked as a source of palaeoenvironmental information

  19. Refining fault slip rates using multiple displaced terrace risers—An example from the Honey Lake fault, NE California, USA

    Science.gov (United States)

    Gold, Ryan D.; Briggs, Richard; Crone, Anthony J.; Duross, Christopher

    2017-01-01

    Faulted terrace risers are semi-planar features commonly used to constrain Quaternary slip rates along strike-slip faults. These landforms are difficult to date directly and therefore their ages are commonly bracketed by age estimates of the adjacent upper and lower terrace surfaces. However, substantial differences in the ages of the upper and lower terrace surfaces (a factor of 2.4 difference observed globally) produce large uncertainties in the slip-rate estimate. In this investigation, we explore how the full range of displacements and bounding ages from multiple faulted terrace risers can be combined to yield a more accurate fault slip rate. We use 0.25-m cell size digital terrain models derived from airborne lidar data to analyze three sites where terrace risers are offset right-laterally by the Honey Lake fault in NE California, USA. We use ages for locally extensive subhorizontal surfaces to bracket the time of riser formation: an upper surface is the bed of abandoned Lake Lahontan having an age of 15.8 ± 0.6 ka and a lower surface is a fluvial terrace abandoned at 4.7 ± 0.1 ka. We estimate lateral offsets of the risers ranging between 6.6 and 28.3 m (median values), a greater than fourfold difference in values. The amount of offset corresponds to the riser's position relative to modern stream meanders: the smallest offset is in a meander cutbank position, whereas the larger offsets are in straight channel or meander point-bar positions. Taken in isolation, the individual terrace-riser offsets yield slip rates ranging from 0.3 to 7.1 mm/a. However, when the offset values are collectively assessed in a probabilistic framework, we find that a uniform (linear) slip rate of 1.6 mm/a (1.4–1.9 mm/a at 95% confidence) can satisfy the data, within their respective uncertainties. This investigation demonstrates that integrating observations of multiple offset elements (crest, midpoint, and base) from numerous faulted and dated terrace risers at closely spaced

  20. Refining fault slip rates using multiple displaced terrace risers-An example from the Honey Lake fault, NE California, USA

    Science.gov (United States)

    Gold, Ryan D.; Briggs, Richard W.; Crone, Anthony J.; DuRoss, Christopher B.

    2017-11-01

    Faulted terrace risers are semi-planar features commonly used to constrain Quaternary slip rates along strike-slip faults. These landforms are difficult to date directly and therefore their ages are commonly bracketed by age estimates of the adjacent upper and lower terrace surfaces. However, substantial differences in the ages of the upper and lower terrace surfaces (a factor of 2.4 difference observed globally) produce large uncertainties in the slip-rate estimate. In this investigation, we explore how the full range of displacements and bounding ages from multiple faulted terrace risers can be combined to yield a more accurate fault slip rate. We use 0.25-m cell size digital terrain models derived from airborne lidar data to analyze three sites where terrace risers are offset right-laterally by the Honey Lake fault in NE California, USA. We use ages for locally extensive subhorizontal surfaces to bracket the time of riser formation: an upper surface is the bed of abandoned Lake Lahontan having an age of 15.8 ± 0.6 ka and a lower surface is a fluvial terrace abandoned at 4.7 ± 0.1 ka. We estimate lateral offsets of the risers ranging between 6.6 and 28.3 m (median values), a greater than fourfold difference in values. The amount of offset corresponds to the riser's position relative to modern stream meanders: the smallest offset is in a meander cutbank position, whereas the larger offsets are in straight channel or meander point-bar positions. Taken in isolation, the individual terrace-riser offsets yield slip rates ranging from 0.3 to 7.1 mm/a. However, when the offset values are collectively assessed in a probabilistic framework, we find that a uniform (linear) slip rate of 1.6 mm/a (1.4-1.9 mm/a at 95% confidence) can satisfy the data, within their respective uncertainties. This investigation demonstrates that integrating observations of multiple offset elements (crest, midpoint, and base) from numerous faulted and dated terrace risers at closely spaced

  1. Processes of Terrace Formation on the Piedmont of the Santa Cruz River Valley During Quaternary Time, Green Valley-Tubac Area, Southeastern Arizona

    Science.gov (United States)

    Lindsey, David A.; Van Gosen, Bradley S.

    2010-01-01

    In this report we describe a series of stepped Quaternary terraces on some piedmont tributaries of the Santa Cruz River valley in southeastern Arizona. These terraces began to form in early Pleistocene time, after major basin-and-range faulting ceased, with lateral planation of basin fill and deposition of thin fans of alluvium. At the end of this cycle of erosion and deposition, tributaries of the Santa Cruz River began the process of dissection and terrace formation that continues to the present. Vertical cutting alternated with periods of equilibrium, during which streams cut laterally and left thin deposits of channel fill. The distribution of terraces was mapped and compiled with adjacent mapping to produce a regional picture of piedmont stream history in the middle part of the Santa Cruz River valley. For selected tributaries, the thickness of terrace fill was measured, particle size and lithology of gravel were determined, and sedimentary features were photographed and described. Mapping of terrace stratigraphy revealed that on two tributaries, Madera Canyon Wash and Montosa Canyon Wash, stream piracy has played an important role in piedmont landscape development. On two other tributaries, Cottonwood Canyon Wash and Josephine Canyon Wash, rapid downcutting preempted piracy. Two types of terraces are recognized: erosional and depositional. Gravel in thin erosional terraces has Trask sorting coefficients and sedimentary structures typical of streamflood deposits, replete with bar-and-swale surface topography on young terraces. Erosional-terrace fill represents the channel fill of the stream that cuts the terrace; the thickness of the fill indicates the depth of channel scour. In contrast to erosional terraces, depositional terraces show evidence of repeated deposition and net aggradation, as indicated by their thickness (as much as 20+ m) and weakly bedded structure. Depositional terraces are common below mountain-front canyon mouths where streams drop their

  2. Sixth-Year Results Following Partial Cutting For Timber and Wildlife Habitat in a Mixed Oak-Sweetgum-Pine Stand on a Minor Creek Terrace in Southeast Louisiana

    Science.gov (United States)

    Brian Roy Lockhart; Norwin E. Linnartz

    2002-01-01

    Hardwood management has primarily focused on highly productive river bottom and upland sites. Less is known about hardwood growth and development on terrace sites. Such sites are usually converted to other uses, especially pine plantations. The objectives of this study, implemented in a minor creek terrace in southeast Louisiana, were to describe changes in stand...

  3. Properties of anthropogenic soils in ancient run-off capturing agricultural terraces in the Central Negev desert (Israel) and related effects of biochar and ash on crop growth

    NARCIS (Netherlands)

    Asperen, van H.L.; Bor, A.M.C.; Sonneveld, M.P.W.; Bruins, H.J.; Lazarovitch, N.

    2014-01-01

    In the Central Negev hills (Israel) many ancient terraced wadis exist, which captured run-off and caused gradual soil aggradation, which enabled agricultural practices. In these terraces, dark colored soil horizons were observed, containing charcoal, as can be found in Terra Preta soils, suggesting

  4. Chronology of fluvial terrace sequences for large Atlantic rivers in the Iberian Peninsula (Upper Tagus and Duero drainage basins, Central Spain)

    Science.gov (United States)

    Silva, Pablo G.; Roquero, Elvira; López-Recio, Mario; Huerta, Pedro; Martínez-Graña, Antonio M.

    2017-06-01

    This work analyses the chronology of fluvial terrace sequences of the two most important fluvial basins from central Spain draining to the Atlantic Ocean (Upper Tagus and Duero drainage basins). Both basins evolved under similar Mediterranean climatic conditions throughout the Pleistocene and present comparable number of fluvial terraces (16-17) after excluding the higher terrace levels of the Tagus (T1-T5) entrenched in the Raña surface. These higher ;rañizo terraces; was formed in response to fan-head trenching in this high alluvial piedmont (+220 m) and therefore not properly controlled by Quaternary fluvial downcutting. The study accomplishes the implementation of multiple regression analyses for terrace height-age relationships. To transform relative terrace heights above the present river thalwegs (i.e. +100 m) in numerical ages a ;height-age transference function; has been developed on the basis of preliminary statistical geochronological approaches proposed for Central Spain. The resultant height-age transference function gather 73 published geochronological data for terrace sequences, featuring a 3rd Order Polynomial Function (R2 0.90). This function describes the overall trend of valley downcutting for the last c. 2.3 Ma in Central Spain and is used to assign numerical ages to terrace levels at different relative elevation.

  5. Controls on dryland mountain landscape development along the NW Saharan desert margin: Insights from Quaternary river terrace sequences (Dadès River, south-central High Atlas, Morocco)

    DEFF Research Database (Denmark)

    Stokes, M.; Mather, A.E.; Belfoul, M.

    2017-01-01

    between 50 and 140 m. The rock strength, stratigraphy and structure of the mountain belt influences terrace distribution. Terraces are absent in river gorges of structurally thickened limestone; whilst well-developed, laterally continuous terraces (T1-T4) form along wide valleys occupying syncline...... spacing of terraces and their distribution throughout the orogen suggests sustained base-level lowering linked to uplift-exhumation of the High Atlas. Low incision rates (

  6. Environmental impact of introducing plant covers in the taluses of orchard terraces: implications for erosion and agricultural runoff control

    NARCIS (Netherlands)

    Rodriguez Pleguezuelo, C.R.; Duran Zuazo, V.H.; Francia Martinez, J.R.; Martin Peinado, F.J.; Graaff, de J.; Muriel Fernandez, J.L.

    2011-01-01

    South-eastern Spain, and in particular the coastal areas of Granada and Malaga, feature a large area under subtropical crops, with orchards established on terraces built along the slopes of the mountainous areas. The climate, characterized by periodically heavy rainfall, variable in space and time,

  7. Soil nitrogen accretion along a floodplain terrace chronosequence in northwest Alaska: Influence of the nitrogen-fixing shrub Shepherdia Canadensis

    Science.gov (United States)

    Charles Rhoades; Dan Binkley; Hlynur Oskarsson; Robert Stottlemyer

    2008-01-01

    Nitrogen enters terrestrial ecosystems through multiple pathways during primary succession. We measured accumulation of total soil nitrogen and changes in inorganic nitrogen (N) pools across a 300-y sequence of river terraces in northwest Alaska and assessed the contribution of the nitrogen-fixing shrub Shepherdia canadensis. Our work compared 5...

  8. Runoff and sediment generation on bench -terraced hillsides: measurements and up-scaling of a field-based model

    NARCIS (Netherlands)

    van Dijk, A.I.J.M.; Bruijnzeel, L.A.; Vertessy, R.A.; Ruijter, J.

    2006-01-01

    Despite widespread bench-terracing, stream sediment yields from agricultural hillsides in upland West Java remain high. We studied the causes of this lack of effect by combining measurements at different spatial scales using an erosion process model. Event runoff and sediment yield from two 4-ha

  9. Improvements in the Weeding of Levee Slope of Terraced Paddy Fields with Statutory Regulation of Places of Scenic Beauty

    Science.gov (United States)

    Uchikawa, Yoshiyuki; Kimura, Kazuhiro; Hirata, Ayumi

    A growing number of terraced paddy fields in Japan are being conserved as cultural assets like places of scenic beauty. This has meant that the task of weeding levee slope of these terraced paddy fields has become increasingly important, not only for general maintenance of the terraced paddy fields, but also because of the impact landscape, vegetation and the surrounding environment. However, the steep gradient of the levee slope and lack of footholds mean that the workability and safety associated with this weeding work is problematic. In addition, in the event that an area has been designated as a cultural asset, there are restrictions regarding how it can be modified and local farmers are reluctant to change their traditional farming methods in such cases. This study therefore sought to clarify the actual condition of the levee slope weeding work undertaken in the places of scenic beauty Obasute Tanada district. Empirical validations of potential measures for reforming the work environment were evaluated based on the findings of this investigation. We demonstrated that it is possible to modify current work practices while still maintaining and preserving the terraced paddy fields, even in designated scenic locations. To improve the working environment for levee slope weeding, we propose creating berms to serve as footholds at the toes of slopes.

  10. The hydrological response of a small catchment after the abandonment of terrace cultivation. A study case in northwestern Spain

    Science.gov (United States)

    Llorente-Adán, Jose A.; Lana-Renault, Noemí; Galilea, Ianire; Ruiz-Flaño, Purificacion

    2015-04-01

    Terrace construction for cultivation results in a complete transformation of the hillslopes to a series of flat sectors and almost vertical steps. This strategy, which involves a redistribution of soils and a re-organization of the drainage network, provides fertile soil over steep slopes, improves infiltration and controls overland flow under conditions of intense rainstorms. In Camero Viejo (north-western Iberian ranges) most of the hillslopes are occupied by terraced fields. During the XXth century, rural population declined and agricultural practices were abandoned. In this area, a small catchment (1.9 km2) was monitored in 2012 for studying how the abandonment of agricultural terraces affect water and sediment transfer from the hillslopes to the channels. Terraces occupy 40% of the catchment and are covered by sparse grass and shrubs. The equipment installed in the catchment registers continuously meteorological data, discharge and water table fluctuations. Data on suspended sediment transport is obtained by means of a rising-stage sampler. Here we present the hydrological results corresponding to the years 2012-13 and 2013-14. The hydrological response of the catchment was moderate (annual runoff coefficient generation process.

  11. Soil erosion, soil fertility and crop yield on slow-forming terraces in the highlands of Buberuka, Rwanda

    NARCIS (Netherlands)

    Kagabo, M.D.; Stroosnijder, L.; Visser, S.M.; Moore, D.

    2013-01-01

    Crop productivity in Rwanda is declining as a result of intensive farming on steep slopes, which leads to soil loss and declining soil fertility particularly in the northern highlands. Slow-forming terraces have been widely adopted in the northern highlands of Rwanda to control soil erosion however

  12. Landscape change in mediterranean farmlands: impacts of land abandonment on cultivation terraces in portofino (italy) and lesvos (greece)

    NARCIS (Netherlands)

    Sluis, van der T.; Kizos, T.; Pedroli, G.B.M.

    2014-01-01

    The Mediterranean landscape has been rapidly changing over the past decades. Many regions saw a population decline, which resulted in changing land use, abandonment of marginal lands and colonisation by shrubs and tree species. Typical features like farming terraces, olive yards, and upland

  13. Submarine terrace limestones from the continental slope off Saurashtra-Bombay: Evidence of Late Quaternary neotectonic activity

    Digital Repository Service at National Institute of Oceanography (India)

    Rao, V.P.; Veerayya, M.

    m depth terrace was at intertidal depths at about 12,000 years BP. The eustatic sea-level, however, was at - 90 m at 12,000 years BP. This disparity suggests neotectonic activity and subsidence by about 40 m on the Saurashtra-Bombay region some time...

  14. The gap between plan and practice : Actual energy performance of the zero-energy refurbishment of a terraced house

    NARCIS (Netherlands)

    Xexakis, G.; Van den Dobbelsteen, A.A.J.F.

    2015-01-01

    Prêt-à-Loger, TU Delft’s entry to the Solar Decathlon Europe 2014 (SDE2014), demonstrated the conversion of a common terraced house to energy neutrality, whilst adding value to its living quality. The house was retrofitted according to principles of smart & bioclimatic design, using local

  15. Geohydrology of the alluvial and terrace deposits of the North Canadian River from Oklahoma City to Eufaula Lake, central Oklahoma

    Science.gov (United States)

    Havens, J.S.

    1989-01-01

    This investigation was undertaken to describe the geohydrology of the alluvial and terrace deposits along the North Canadian River between Lake Overholser and Eufaula Lake, an area of about 1,835 square miles, and to determine the maximum annual yield of ground water. A 1982 water-level map of the alluvial and terrace aquifer was prepared using field data and published records. Data from test holes and other data from the files of the U.S. Geological Survey and the Oklahoma Water Resources Board were used to establish the approximate thickness of the alluvial and terrace deposits. The North Canadian River from Lake Overholser, near Oklahoma City, to Eufaula Lake is paralleled by a 2- to 3-mile wide band of alluvium. Scattered terrace deposits on either side of the alluvium reach an extreme width of 8 miles. Rocks of Permian age bound the alluvial and terrace deposits from the west to the midpoint of the study area; Pennsylvanian rocks bound the alluvial and terrace deposits from that point eastward. Three major aquifers are present in the study area: the alluvial and terrace aquifer, consisting of alluvium and terrace deposits of Quaternary age in a narrow band on either side of the North Canadian River; the Garber-Wellington aquifer of Permian age, consisting of an upper unconfined zone and a lower confined zone separated by relatively impermeable shales; and the Ada-Vamoosa aquifer of Pennsylvanian age. At locations were the alluvial and terrace aquifer overlies either of the other aquifers, there is hydraulic continuity between the alluvial and terrace aquifer and the other aquifers, and water levels are the same. Most large-scale municipal and industrial pumping from the Garber-Wellington aquifer is from the lower zone and has little discernible effect upon the alluvial and terrace aquifer. The total estimated base flow of the North Canadian River for the studied reach is 264 cubic feet per second. Evapotranspiration from the basin in August is about 60 cubic

  16. Assessment of heavy metal contamination of surface soils from typical paddy terrace wetlands on the Yunnan Plateau of China

    Science.gov (United States)

    Bai, Junhong; Xiao, Rong; Gong, Adu; Gao, Haifeng; Huang, Laibin

    Little research has been done to investigate heavy metal contamination in paddy soils along different altitudes under domestic sewage irrigation. Total concentrations of As, Cr, Cd and Pb were determined in surface paddy soils from Mengpin (MP) and Quanfuzhang (QFZ) paddy terraces on the Yunnan Plateau of China in December, 2004, in order to assess their contamination status. Results showed that the average concentrations of As and Cd in both terrace soils were significantly ( p Cr, the average concentrations are higher in MP soils while lower in QFZ soil than the reference concentration, while. Compared with MP soils, QFZ soils had lower heavy metal concentrations. However, only Cd greatly exceeded the guide value of soil quality. The contamination factor ( Cfi) values were generally moderate for As and Cd, and low for Pb in both sites. As for Cr, they were moderate in MP soils but low in QFZ soils. The contamination degree ( C d) values were generally moderate, showing a decreasing tendency along the increasing altitudes in MP terrace, while slowly increasing tendency in QFZ terrace.

  17. Architectural competitions and the issue of the autonomy of architecture: The case of Terazije Terrace

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    Šišović Grozdana

    2016-01-01

    Full Text Available Terazije Terrace in Belgrade and many different architectural projects for this space produced over the last almost 90 years are the subject matter of the analysis. The research is conducted with the aim to recognize and present diverse currents in the development of an architectural scene and shed light on the role of architectural competitions in these complex flows. The 1929-1930 competition won by Nikola Dobrović, as well as the 1968, 1991 and 1998 competitions with the awarded projects are the focal point of the paper as the samples of architectural practice significant for the understanding of the relations between the treatment of “grand architectural themes” and the dominant orientation of a local architectural culture. The theoretical framework refers to contemporary theoretical debate on the autonomy of the discipline (Somol and Whiting, 2002; Aureli, 2008; Hays, 2010; among the others.

  18. Rice Pricing during Organic Conversion of the Honghe Hani Rice Terrace System in China

    Directory of Open Access Journals (Sweden)

    Moucheng Liu

    2018-01-01

    Full Text Available In 2002, the United Nations Food and Agriculture Organization initiated the Globally Important Agriculture Heritage Systems conservation program. Agricultural organic certification, based on traditional environmentally friendly technology, increases farmer income and encourages traditional agricultural heritage. However, during the organic conversion period, farmer income cannot be guaranteed; this period is also a bottleneck for heritage conservation via organic certification. Based on experiences at the Honghe Hani rice terrace system in Yunnan, China, we calculated and compared inputs and outputs of traditional and modern systems during organic conversion and developed a calculation method for determining opportunity costs of agricultural production. We found that the stability of farmer income during conversion can be guaranteed by setting the protective purchasing price at 6.93 CNY/kg, thereby achieving the goal of dynamic conservation of agricultural heritage systems.

  19. Luminescence dated Late Pleistocene wave-built terraces in northeastern Brazil

    Directory of Open Access Journals (Sweden)

    Kenitiro Suguio

    2011-09-01

    Full Text Available This study presents field and chronological investigations along the coast of northeastern Brazil from ~4°S to 9°S latitude, which corresponds to ~700 km of coastline under a semi-diurnal mesotidal regime. We investigated wave-built terrace deposits and dated sediments using the optically stimulated luminescence and thermoluminescence methods on quartz grains. The wave-built terraces yielded two main age groups: 200-230 ka and 100-130 ka, which we interpreted as depositional ages. We correlated these age groups with oxygen-isotope stages 7c and 5e, respectively. These events correspond to the antepenultimate and penultimate transgressions along the Brazilian coast. The deposits occur mainly in patches on low-lying flat plateaus along the littoral zone and incision valleys that cut across coastal tablelands. The altitude of the base of the 200-230 ka terraces ranges from 10 m above mean sea level (asl to -2m asl, whereas the base of the 100-130 ka varies from 12 m asl to -2 m asl. Both terraces were deposited in the foreshore and upper shoreface zones. We noted a coincidence between sea-level highstand chronologies in northeastern Brazil and those in the Bahamas and Bermuda.Este estudo apresenta uma investigação de campo e geocronológica realizada ao longo da costa nordeste do Brasil entre ~4°S e 9°S de latitude, o que corresponde a ~700 km de costa submetida a um regime de meso-maré. Nós investigamos terraços marinhos construídos por ondas e datamos sedimentos usando luminescência oticamente estimulada e termoluminescência em grãos de quartzo. Os terraços marinhos forneceram dois grupos de idades: 200-230 ka e 100-130 ka, que interpretamos como idades de deposição. Nós correlacionamos estas idades com idades do estágio isotópico do oxigênio 7c e 5e, respectivamente. Estes eventos correspondem a antepenúltima e penúltima transgressões que ocorreram ao longo da costa brasileira. Os depósitos ocorrem predominantemente em

  20. Recent uplift of the Atlantic Atlas (offshore West Morocco): Tectonic arch and submarine terraces

    Science.gov (United States)

    Benabdellouahed, M.; Klingelhoefer, F.; Gutscher, M.-A.; Rabineau, M.; Biari, Y.; Hafid, M.; Duarte, J. C.; Schnabel, M.; Baltzer, A.; Pedoja, K.; Le Roy, P.; Reichert, C.; Sahabi, M.

    2017-06-01

    Re-examination of marine geophysical data from the continental margin of West Morocco reveals a broad zone characterized by deformation, active faults and updoming offshore the High Atlas (Morocco margin), situated next to the Tafelney Plateau. Both seismic reflection and swath-bathymetric data, acquired during Mirror marine geophysical survey in 2011, indicate recent uplift of the margin including uplift of the basement. This deformation, which we propose to name the Atlantic Atlas tectonic arch, is interpreted to result largely through uplift of the basement, which originated during the Central Atlantic rifting stage - or even during phases of Hercynian deformation. This has produced a large number of closely spaced normal and reverse faults, ;piano key faults;, originating from the basement and affecting the entire sedimentary sequence, as well as the seafloor. The presence of four terraces in the Essaouira canyon system at about 3500 meters water depth and ;piano key faults; and the fact that these also affect the seafloor, indicate that the Atlantic Atlas is still active north of Agadir canyon. We propose that recent uplift is causing morphogenesis of four terraces in the Essaouira canyon system. In this paper the role of both Canary plume migration and ongoing convergence between the African and Eurasian plates in the formation of the Atlantic Atlas are discussed as possibilities to explain the presence of a tectonic arch in the region. The process of reactivation of passive margins is still not well understood. The region north of Agadir canyon represents a key area to better understand this process.

  1. Two millennia of soil dynamics derived from ancient desert terraces using high resolution 3-D data

    Science.gov (United States)

    Filin, Sagi; Arav, Reuma; Avni, Yoav

    2017-04-01

    Large areas in the arid southern Levant are dotted with ancient terrace-based agriculture systems which were irrigated by runoff harvesting techniques. They were constructed and maintained between the 3rd - 9th centuries AD and abandoned in the 10th century AD. During their 600 years of cultivation, these terraces documented the gradual aggradation of alluvial soils, erosion processes within the drainage basins, as well as flashflood damage. From their abandonment and onwards, they documented 1000 years and more of land degradation and soil erosion processes. Examination of these installations presents an opportunity to study natural and anthropogenic induced changes over almost two millennia. On a global scale, such an analysis is unique as it is rare to find intact manifestations of anthropogenic influences over such time-scales because of landscape dynamics. It is also rare to find a near millennia documentation of soil erosion processes. We study in this paper the aggradation processes within intact agriculture plots in the region surrounding the world heritage Roman-Byzantine ancient city of Avdat, Negev Highlands. We follow the complete cycle of the historical desert agriculture, from the configuration pre-dating the first anthropogenic intervention, through the centuries of cultivation, and up to the present erosion phase, which spans over more than a millennium. We use high resolution 3-D laser scans to document the erosion and the environmental dynamics during these two millennia. The high-resolution data is then utilized to compute siltation rates as well as erosion rates. The long-term measures of soil erosion and land degradation we present here significantly improve our understanding of the mechanism of long-term environmental change acting in arid environments. For sustainable desert inhabitation, the study offers insights into better planning of modern agriculture in similar zones as well as insights on strategies needed to protect such historical

  2. Agricultural terraces montoring and modeling: a field survey in Chianti region, Firenze, Italy - First part

    Science.gov (United States)

    Preti, Federico; Caruso, Marco; Dani, Andrea; Errico, Alessandro; Guastini, Enrico; Trucchi, Paolo

    2015-04-01

    The two abstracts present the design and set-up of an experimental field plant whose aim is the study and modeling of water circulation in a terraced slope together with its influence on the stability of the retaining dry stone walls. The pilot plant is located at "Fattoria di Lamole" (Greve in Chianti, Firenze, Italy) where both ancient and recently restored or rebuilt dry stone retaining walls are present. The intense vineyards cultivation makes it very representative in terms of range of external stresses that affect both hillslopes and walls. The research is developed within a bigger framework of landscape preservation as a way to prevent hydrogeological instabilities and landslide risks. First Part A first/preliminary field survey was carried out in order to estimate the hydraulic and mechanical soil characteristics. Field saturated hydraulic conductivity measurements with the Simplified Falling Head (SFH) method on a terrace along an alignment were performed. Infiltrometer tests with a double ring device and soil texture determinations with both fine particle-size and skeleton fraction distributions were also performed. The Direct shear test on undisturbed and reconstituted soil samples will offer an estimation of the Mohr-Coulomb failure envelope parameters (friction angle and cohesion). A reference portion of a dry stone wall will be also monitored. Lateral earth pressure at backfill-retaining wall interface (compared to temperature and air pressure measured values), backfill volumetric water content (both in saturated and unsaturated states) and ground-water level are measured. Acknowledgements Italian Research Project of Relevant Interest (PRIN2010-2011), prot. 20104ALME4, National network for monitoring, modeling, and sustainable management of erosion processes in agricultural land and hilly-mountainous area

  3. The Pink and White Terraces of Lake Rotomahana: what was their fate after the 1886 Tarawera Rift eruption?

    Science.gov (United States)

    de Ronde, C. E. J.; Fornari, D. J.; Ferrini, V. L.; Walker, S. L.; Davy, B. W.; LeBlanc, C.; Caratori Tontini, F.; Kukulya, A. L.; Littlefield, R. H.

    2016-03-01

    The Pink and White Terraces that once stood regally on the shores of old Lake Rotomahana, and which were unique in their beauty as a natural wonder of the world, were regarded by the local Māori as a taonga, or treasure, because of the therapeutic qualities of the waters and their majestic appearance. The eruption of Mt. Tarawera on June 10, 1886 is commonly cited as the cause of their demise, with the lake rapidly rising soon thereafter to drown the large, newly formed Rotomahana crater and other volcanic edifices shaped during the excavation of the old lake. Thus, the effects of the eruption have been masked from onlookers for more than 125 years. However, application of state-of-the-art survey techniques usually applied in the marine realm to modern Lake Rotomahana, including AUV surveys with numerous sensors, seismic profiling, water column surveys and deployment of deep sea cameras, has provided a wealth of new information about the state of hydrothermal systems in the lake and the probable fortunes of the Pink and White Terraces. We believe that the majority of both sets of terraces were destroyed during the eruption. However, some tantalizing evidence remains for remnants from both sites to exist to this day. High-resolution bathymetric mapping of the lake floor clearly recognizes some features of the post-1886 landscape, including a prominent landmark known as The Pinnacle. If we accept the postulated location of The Pinnacle on a pre-1886 map of Lake Rotomahana, then we appear to have captured a photograph of one of the buttresses to a tier of the nearby White Terraces. More revealing, are side-scan sonar images of structures located in the correct position of the Pink Terraces with respect to The Pinnacle, albeit ~ 20 m deeper than expected if the pre-1886 lake level of 292 m above sea level is to be believed. This work clearly shows that the greater Pink Terraces hydrothermal system survived the eruption and is very active today, whereas that part of

  4. Impacts of terracing on soil erosion control and crop yield in two agro-ecological zones of Rwanda

    Science.gov (United States)

    Rutebuka, Jules; Ryken, Nick; Uwimanzi, Aline; Nkundwakazi, Olive; Verdoodt, Ann

    2017-04-01

    Soil erosion remains a serious limiting factor to the agricultural production in Rwanda. Terracing has been widely adopted in many parts of the country in the past years, but its effectiveness is not yet known. Besides the standard radical (bench) terraces promoted by the government, also progressive terraces (with living hedges) become adopted mainly by the farmers. The aim of this study was to measure short-term (two consecutive rainy seasons 2016A and 2016B) run-off and soil losses for existing radical (RT) and progressive (PT) terraces versus non-protected (NP) fields using erosion plots installed in two agro-ecological zones, i.e. Buberuka highlands (site Tangata) and Eastern plateau (site Murehe) and determine their impacts on soil fertility and crop production. The erosion plot experiment started with a topsoil fertility assessment and during the experiment, maize was grown as farmer's cropping preference in the area. Runoff data were captured after each rainfall event and the collected water samples were dried to determine soil loss. Both erosion control measures reduced soil losses in Tangata, with effectiveness indices ranging from 43 to 100% when compared to the NP plots. RT showed the highest effectiveness, especially in season A. In Murehe, RT minimized runoff and soil losses in both seasons. Yet, the PT were largely inefficient, leading to soil losses exceeding those on the NP plots (ineffectiveness index of -78% and -65% in season A and B, respectively). Though topsoil fertility assessment in the erosion plots showed that the soil quality parameters were significantly higher in RT and NP plots compared to the PT plots on both sites, maize grain yield was not correlated with the physical effectiveness of the erosion control measures. Finally, the effectiveness of soil erosion control measures as well as their positive impacts on soil fertility and production differ not only by terracing type but also by agro-ecological zone and the management or

  5. Spatial patterns and stability of soil water content in forested slope and terraced area on the Loess Plateau, China

    Science.gov (United States)

    Xu, Guoce; Li, Zhanbin; Li, Peng

    2016-04-01

    Soil water content (SWC) plays a vital role in hydrological and vegetation restoration processes. It is the principal limiting factor for vegetation restoration on the Loess Plateau of China. This study aimed to analyze the spatial patterns and stability of SWC in a terraced area containing jujube trees (Ziziphus jujuba Mill.) and a forested slope with Chinese pine (Pinus tabulaeformis Carr.) following rainfall. The SWCs in nine soil layers at intervals of 0.2 m down to a depth of 1.8 m were measured at 21 locations both in the terraces and in the forested slope from July 19 to September 3 in 2014. The results showed that the SWCs at different soil depths were normally distributed. The SWC in terraces and forestland at each soil depth all had strong temporal stability. The temporal stability of SWC was lower in the 0-0.4 m soil layer than at the deeper soil depths. The representative locations for SWC were depth-dependent and the number of representative locations was not constant. The mean SWC was largest in the lower terrace slopes. The lowest mean SWC in the forested slope was at the mid-slope point due to the highest root distribution. The 0.4-0.6 m soil depth was generally the wettest in both terraces and forestland. The driest soil depth in terraces was 1.0-1.2 m while the driest soil depth in forestland was 0.8-1.0 m. The SWC had a significant positive correlation with clay and silt content. Moerover, the SWC had a significant positive correlation with SOC and did not have a significant correlation with root conten in the terraced area. But in the forested slope, the SWC had a significant negative correlation with roots and did not have a significant correlation with SOC. Although it is feasible to use the representative locations of SWC to represent the mean SWC of a hillslope over a period of time, the cumulative absolute error increases with the cumulative number of days. In conclusion, the SWC at different soil depths and locations showed strong spatial

  6. Terraced landscape: from an old best practice to a rising land abandoned-related soil erosion risk

    Science.gov (United States)

    Tarolli, Paolo; Preti, Federico; Romano, Nunzio

    2013-04-01

    Among the most evident landscape signatures of human fingerprint during the Holocene, the terraces related to agricultural activities deserve a great importance. Landscape terracing probably represents one of the oldest best practice primarily for crop production, but also for mitigating soil erosion and stabilizing hillslopes in landforms dominated by steep slopes. This technique is widely used in various parts of the world even under different environmental conditions. In some zones, terraced landscapes, because of their history and locations, can also be considered a historical heritage and a sort of "cultural landscape" to preserve, an absolutely value for tourism. To preserve their original role of soil erosion prevention, terraces should be properly designed built according to specific and sustainable engineering rules. Then, their maintenance is the most critical issue to deal with. It is well known from literature that terraced landscapes subject to abandonment would result in an increasing of terrace failure and related land degradation. If not maintained, a progressively increasing of gully erosion affects the structure of the walls. The results of this process is the increasing of connectivity and runoff. During the last few years and partly because of changing in the society perspective and migration toward metropolitan areas, some Countries have been affected by a serious and wider land abandonment with an increasing of soil erosion and derived landslide risk. Italy is one example. In this work, we consider three typical case studies of a terraced landscape where the lack of maintenance characterizing the last few years, increased the landslide risk with several problems to the population. The first case study is located along the renowed "Amalfi Coast" (a portion of land located near Salerno, southern Italy), the second is placed in the north of Toscana (a region located in Central Italy), and the third one along the so-called "Cinque Terre" (a region

  7. Exploring the State of Retention of Traditional Ecological Knowledge (TEK in a Hani Rice Terrace Village, Southwest China

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    Zheng Yuan

    2014-07-01

    Full Text Available Traditional Ecological Knowledge (TEK is one of the components of the Globally Important Agricultural Heritage Systems (GIAHS, which are good examples of evolutionary adapted socio-ecosystems in human history. The Hani Rice Terraces System, located in China’s southwestern Yunnan Province, is a living example of GIAHS. The Hani Rice Terraces system has existed for more than one thousand years, following TEK related to cultivation and natural resources management, which was collected and practiced continually. Over this long time period, TEK has enabled the Hani people to manage their terraces and other natural resources in a sustainable way. This paper concentrates on the TEK transferring in the current Hani community, taking a small village, Mitian, as an example. Grouping the interviewees into three different age groups (young group, 0–30 years old; middle-age group, 31–50 years old; old group > 50 years old, we investigated their understanding and participation in 13 items of TEK in relation to rice cultivation and water utilization. The items of TEK were divided into four categories, namely “Festivals”, “Beliefs”, “Folk Songs”, and “Water Management”. From the data collected, it was learned that all the items of TEK are well known, but not necessarily practiced. Age and gender have significant influences on farmers’ understanding and participation in TEK. Our analysis suggested that both the knowledge and the practice showed declining trends from the older to the younger age group. Men and women behave differently in practices. In general, it is shown that TEK is declining in the Hani villages which will affect the rice terrace system in ways that are yet unknown. It is likely that a blended TEK, with old and new knowledge and practices, will emerge to sustain the upland rice terrace systems of Yunnan.

  8. Rates of river incision across the main tectonic units of the Pamir identified using optically stimulated luminescence dating of fluvial terraces

    Science.gov (United States)

    Fuchs, Margret C.; Gloaguen, Richard; Krbetschek, Matthias; Szulc, Adam

    2014-07-01

    Calculated incision rates along the Panj, the main river of the Pamir, are used to investigate any influence by tectonics or climate on the architecture of the river. The depositional ages of Panj River terraces were calculated using optically stimulated luminescence (OSL) dating of terrace sand. Fluvial incision rates were generated by integrating the terrace depositional ages with accurate kinematic GPS measurements of terrace heights above the modern Panj. We investigated 16 terraces along the Panj at the western Pamir margin and one terrace from the Vakhsh River to the north of the Pamir. The results reveal brief periods of fluvial deposition over the past 26 kyr. The oldest Panj terrace depositional ages coincide with early MIS 2 and MIS 2/1 glaciations on the Pamir Plateau. Younger terrace ages have no apparent link with glacial cycles. Terraces with varying heights above the modern Panj at different localities yielded similar depositional ages. This suggests that local conditions have determined fluvial incision rates. Combining all of the terrace measurements, the average incision rate of the Panj over the last 26 kyr has been ~ 5.6 mm/yr. A high mean incision rate of ~ 7.3 mm/yr was calculated from terraces where the Panj has cut a steep-sided valley through the Shakhdara dome. Significantly lower incision rates (~ 2-3 mm/yr) were calculated from terraces where the Panj flows along the southern boundaries of the Shakhdara and Yazgulom domes. At those localities, graded segments of the Panj River profile and increased valley widths are indicative of local base levels. Downstream of the Yazgulom dome, river incision rates are generally lower (~ 4-5 mm/yr) than the Panj average. However, there is one exception where higher incision rates (~ 6 mm/yr) were calculated upstream of the Darvaz Fault Zone, a major tectonic feature that forms the western boundary of the Pamir. The Vakhsh River terrace to the north of the Pamir yielded a lower incision rate (~ 3 mm

  9. Effect of Coffee Pulp Compost and Terrace on Erosion, Run off and Nutrients Loss from Coffee Plantation in Lahat Regency, South Sumatra

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    Siti Masreah Bernas

    2011-05-01

    Full Text Available On some coffee plantations in Lahat Regency South Sumatra, in some places the farmers did not apply agricultural practices, such as tillage, conservation practices, and fertilizers. Many researches have been done to study about effects of organic fertilizer on soil nutrients content and plant growth as well as and the impacts of terrace on soil water content, run-off and erosion. However, there was less research in the highland area. Whereas the possibility of run off, erosion and nutrient leaching the high land area was high. Thus, it was important to apply terrace and organic coffee pulp in this farm. The aims of this research were to determine the effect of terrace and organic fertilizer on run off and soil erosion, nutrients loss and nutrient content in coffee leaves. Terrace system and organic fertilizer were applied on a one year old coffee plantation in Lahat Regency. Before the treatment applied, coffee pulp as organic fertilizer was decomposed in the chamber for about 2 months. The experiment was conducted in factorial in a Randomized Block Design with two factors. The first factor was coffee pulp compost (0, 3, and 6 Mg ha-1, and the second factor was type of terrace (without, individual, and bund terraces. The size of each plot was 2 m width and 10 m length. Data was analysed by using LSD (Least Significant Different test. The result shows that bund terrace reduced runoff and erosion significantly up to 79% (for run off water and 78% (for eroded soil compared to without terrace. Organic fertilizer did not affect run off and soil erosion. This may be caused by properties of coffee pulp compost which were fine particulates and the dosages of application were too low to cover soil suface. Bund terrace decreased significantly N, P, K nutrients in soil loss (sediment. The amount of N loss was reduced from 3.37 kg ha-1 per four months (without terrace to about 0.75 kg ha-1 per four months (bund terrace. Terrace and organic fertilizer did

  10. Late Quaternary river terrace sequences in the eastern Kunlun Range, northern Tibet: A combined record of climatic change and surface uplift

    Science.gov (United States)

    Wang, An; Smith, Jacqueline A.; Wang, Guocan; Zhang, Kexin; Xiang, Shuyuan; Liu, Demin

    2009-04-01

    The Kunlun Range, a reactivated orogenic belt, constitutes the northern margin of the Tibetan Plateau. The extreme relief and major landforms of the Kunlun Range are a product of late Cenozoic tectonics and erosion. However, well-developed late Quaternary terraces that occur along the northern slope of the Kunlun Range probably resulted from climatic change rather than surface uplift. The terrace sequences formed in thick Quaternary valley fills and have total incision depths of 50-60 m. Optically stimulated luminescence dating was employed to place time controls on the valley fills and associated terraces. Dating results suggest that periods of significant aggradation were synchronous between different rivers and correspond to the last glacial stage. The abrupt change from aggradation to incision occurred between 21.9 ± 2.7 and 16 ± 2.2 ka, coincident with the last glacial-interglacial transition. Additional terraces developed during the late glacial period and early to middle Holocene. Based on a broader set of chronological data in northern Tibet, at least four regional incision periods can be recognized. Chronological data, terrace elevation profiles, and climate proxy records suggest that these terracing periods were triggered by cool and/or wet climatic conditions. A geometric survey of the riverbed longitudinal profile suggests that surface uplift serves as a potential dynamic forcing for long-term incision. A model is proposed for terrace formation as a response to climatic perturbation in an uplifted mountain range.

  11. Quantification of fluvial response to tectonic deformation in the Central Pontides, Turkey; inferences from OSL dating of fluvial terraces

    Science.gov (United States)

    McClain, Kevin; Yıldırım, Cengiz; Çiner, Attila; Akif Sarıkaya, M.; Şahin, Sefa; Özcan, Orkan; Güneç Kıyak, Nafiye; Öztürk, Tuǧba

    2017-04-01

    From Late Miocene to present, Anatolia's rapid counterclockwise movement, which increases in velocity towards the Hellenic Arc, has formed the North Anatolian Fault (NAF), a dextral transform fault along the Anatolia-Eurasia plate boundary and the northern margin of the Central Anatolian Plateau (CAP). A zone of transpression referred to as the Central Pontides exists between the broad restraining bend of the NAF and the Black Sea Basin, uplifting what is interpreted as a detached flower structure. Dating of Quaternary landforms in the eastern flank of the Central Pontides has helped to understand its recent deformation. However, in the western flank of the Central Pontides there is an absence of Quaternary studies, relatively quiet modern seismicity, and difficulties locating or observing fault scarps. This led us to use optically stimulated luminescence dating (OSL-dating) of fluvial terrace sediments and the study of geomorphic features to gain insight into the influence of climate and tectonics on landscape evolution of this area. In this area, the Filyos River crosses the Karabük Fault (reverse fault) and deeply incises a gorge through the Karabük Range before flowing towards the Black Sea. In the gorge an abundance of indicators of tectonic deformation were mapped, such as hanging valleys, wind gaps, bedrock gorges, landslides, steep V-shaped channels, tilted basins, as well as fluvial strath terraces. In particular, strath terraces of at least 8 levels within just 1.5 km of horizontal distance were examined. We used OSL-dating to estimate five deposition ages of fluvial strath terrace sediments, leading to an estimation of incision and uplift rates over time. Using three samples per terrace with strath elevations of 246 ± 0.2 m, 105.49 ± 0.2 m, 43.6 ± 0.2 m, 15.3 ± 0.2 m and 3.6 ± 0.2 m above the Filyos River, we determined corresponding ages of 841 ± 76 ka, 681 ± 49 ka, 386 ± 18 ka, 88 ± 5.1 ka and 50.9 ± 2.8 ka. Incision rates over time (oldest

  12. The influence of the maintenance of terraced areas on slope stability during the November 2014 flood event in Liguria (northwestern Italy)

    Science.gov (United States)

    Giordan, Daniele; Poggi, Flavio; Baldo, Marco; Cignetti, Martina

    2016-04-01

    Terraced environments are a widespread feature of the coastal settlement of eastern Liguria (northwestern Italy) and they constitute a well-known favorable role in slope stability. In this region, starting from the twentieth century, the progressive abandonment of agriculture determines a progressively increasing lack of maintenance of the terraces, consequently raising the level of slope instability. Moreover, it should be taken into account not only the level of terraces maintenance, but also their interaction with several factors as i) geological and geomorphological conditions, ii) soil properties, iii) hydrological and hydrogeological conditions, and iv) land use, causing an increase in landslides occurrence. The definition of managed terraces effects on slope stability and their response to external stress like a flood event is rather complicated; a possible approach is a statistical analysis of the effects of a flood event over a large terraced area, distinguishing the maintained sectors from the abandoned ones. After the November 2014 flood event, which affected several sectors of the Liguria region, where a high number of shallow landslides were triggered, an airborne LiDAR survey of the damaged area was carried out. In particular, a high resolution Digital Terrain Model (DTM) resampled to a lower density (1 square meter grid spacing) and a photogrammetric coverage of the area was performed, in order to create a landslide map of the flood event. The surveyed area covered more than 380 square kilometers, and over 1600 shallow landslides triggered by the flood event were identified and inventoried. The high resolution DTM allowed the identification of terraced areas also in wooded sectors and a sharp mapping of the extension of terraced slopes in this portion of Liguria region. By considering: i) the terraced areas recognized through DTM analysis, ii) the mapped landslides, and iii) the land use classification, a correlation between the presence of terraces

  13. Timing of fluvial terrace formation and concomitant travertine deposition in the upper Sutlej River (Tirthapuri, southwestern Tibet) and paleoclimatic implications

    Science.gov (United States)

    Wang, Zhijun; Meyer, Michael C.; Gliganic, Luke A.; Hoffmann, Dirk L.; May, Jan-Hendrik

    2017-08-01

    Travertines are carbonates precipitated from hydrothermal springs and are relatively common on the Tibetan plateau and occur along tectonically active faults. The Karakoram fault system is an active strike-slip fault that extends from the Pamir into southwestern Tibet, where it controls the course of the upper Sutlej River and the occurrence of several hydrothermal springs, including the Tirthapuri hot springs. Multiple fluvial terraces that are partly capped by travertine are preserved in the Tirthapuri area. Four main fluvial terrace levels (labelled as T1 to T4 with increasing height above river) were identified and several meter-thick travertine platforms occur on the current river level as well as the T2 and T3 terraces. Sedimentological and petrographic observations suggest that the travertine platforms were deposited on active floodplains of the paleo- and modern Sutlej River, and preserved from fluvial erosion because travertine precipitation was immediately followed by vertical river-bed incision and thus terrace abandonment. Results of 230Th/U in combination with luminescence dating show that the deposition of travertine platform and river incision that led to the formation of T3 terrace (∼93 m above the Sutlej) took place at ca. 127.5 ka. The development of terrace T2 and overlying travertine platform (∼28 m above the Sutlej) occurred between ca. 10.0 and 8.8 ka. Fluvial incision has arrived at the modern level at least ca. 0.2 ka ago. Both the travertine deposition and major river incision are likely triggered by the intensified Indian summer monsoon and are linked to phases of maximum monsoon strength. During strong monsoon phases, a large quantity of moisture is transported into southwestern Tibet, activating hot springs and thus travertine precipitation, facilitating fluvial incision and stripping off sediments from the regional hill-slopes. At least over the last glacial cycle we suggest that the Tirthapuri travertine and associated fluvial

  14. Radiocarbon dating of the Early Natufian at el-Wad Terrace, Mount Carmel, Israel

    Science.gov (United States)

    Eckmeier, E.; Yeshurun, R.; Weinstein-Evron, M.; Mintz, E.; Boaretto, E.

    2012-04-01

    The Natufian culture (15-11.5 kyr BP) of the Levant played an integral role in the transition from nomadic hunter-gatherers to the establishment of sedentism and, finally, to food producing societies of the Neolithic. The Natufian sites in the Southern Levant are characterised by a lack of macrobotanical remains, including charcoal, and a poor preservation of bone collagen. A result of the scarcity of radiocarbon dateable material is that only about 30 reliable radiocarbon dates from the Natufian are available for constructing a chronology of this period, which would enable a better synchronisation of archaeological and environmental data. A key question of Natufian research is if and to what extent past climate changes influenced the lifestyle of the Natufian communities, but the prerequisite for the correlation of cultural and environmental events in time are accurate chronologies. Therefore, a chronological framework with dates from well-defined contexts and samples of good quality is essential for the investigation of the Natufian. We present new C-14 data from the site of el-Wad Terrace, one of the major Natufian hamlets of the 'core area' of this culture. The samples (12 charcoals and 34 bones, of which 6 charcoals and 5 bones were suitable for dating) were derived from Early Natufian (15-13 kyr BP) living surfaces, dwellings and burials. Using FTIR, we investigated the environmental factors that influenced the preservation of material for radiocarbon dating of the site, and we tested a modified pre-treatment method for poorly preserved charcoal samples. We found that the usual pre-treatment protocol for C-14 samples (W-ABA) removed more charcoal material than the method modified by Rebollo et al. (2008) which omits the first acid treatment (W-BA). This first acid step enhanced the extraction of humic substances during the subsequent base step. The modified W-BA method is a promising tool for dating poorly preserved charcoals which needs further testing with

  15. The Eco-Refurbishment of a 19th Century Terraced House: Energy and Cost Performance for Current and Future UK Climates

    National Research Council Canada - National Science Library

    Haniyeh Mohammadpourkarbasi; Steve Sharples

    2013-01-01

    ... met. This paper uses computer modeling to examine the annual operational energy performance, long term energy cost savings and internal thermal conditions for a 19th century terraced house that was eco...

  16. Digital data sets that describe aquifer characteristics of the alluvial and terrace deposits along the North Canadian River from Canton Lake to Lake Overholser in central Oklahoma

    Data.gov (United States)

    U.S. Geological Survey, Department of the Interior — This data set consists of digital water-level elevation contours for the alluvial and terrace deposits along the North Canadian River from Canton Lake to Lake...

  17. Digital data sets that describe aquifer characteristics of the alluvial and terrace deposits along the North Canadian River from Canton Lake to Lake Overholser in central Oklahoma

    Data.gov (United States)

    U.S. Geological Survey, Department of the Interior — This data set consists of digital polygons of a constant hydraulic conductivity value for the alluvial and terrace deposits along the North Canadian River from...

  18. Digital data sets that describe aquifer characteristics of the alluvial and terrace deposits along the Cimarron River from Freedom to Guthrie in northwestern Oklahoma

    Data.gov (United States)

    U.S. Geological Survey, Department of the Interior — This data set consists of digital aquifer boundaries for the alluvial and terrace deposits along the Cimarron River from Freedom to Guthrie in northwestern Oklahoma....

  19. Digital data sets that describe aquifer characteristics of the alluvial and terrace deposits along the North Canadian River from Canton Lake to Lake Overholser in central Oklahoma

    Data.gov (United States)

    U.S. Geological Survey, Department of the Interior — This data set consists of digital aquifer boundaries for the alluvial and terrace deposits along the North Canadian River from Canton Lake to Lake Overholser in...

  20. Digital data sets that describe aquifer characteristics of the alluvial and terrace deposits along the Cimarron River from Freedom to Guthrie in northwestern Oklahoma

    Data.gov (United States)

    U.S. Geological Survey, Department of the Interior — This data set consists of digital polygons of a constant recharge rate for the alluvial and terrace deposits along the Cimarron River from Freedom to Guthrie in...

  1. Digital data sets that describe aquifer characteristics of the alluvial and terrace deposits along the Cimarron River from Freedom to Guthrie in northwestern Oklahoma

    Data.gov (United States)

    U.S. Geological Survey, Department of the Interior — This data set consists of digital water-level elevation contours for the alluvial and terrace deposits along the Cimarron River in northwestern Oklahoma during...

  2. Digital data sets that describe aquifer characteristics of the alluvial and terrace deposits along the Cimarron River from Freedom to Guthrie in northwestern Oklahoma

    Data.gov (United States)

    U.S. Geological Survey, Department of the Interior — This data set consists of digital polygons of constant hydraulic conductivity values for the alluvial and terrace deposits along the Cimarron River from Freedom to...

  3. Digital data sets that describe aquifer characteristics of the alluvial and terrace deposits along the North Canadian River from Canton Lake to Lake Overholser in central Oklahoma

    Data.gov (United States)

    U.S. Geological Survey, Department of the Interior — This data set consists of digital polygons of a constant recharge value for the alluvial and terrace deposits along the North Canadian River from Canton Lake to Lake...

  4. The Age of the 20 Meter Solo River Terrace, Java, Indonesia and the Survival of Homo erectus in Asia

    Science.gov (United States)

    Indriati, Etty; Swisher, Carl C.; Lepre, Christopher; Quinn, Rhonda L.; Suriyanto, Rusyad A.; Hascaryo, Agus T.; Grün, Rainer; Feibel, Craig S.; Pobiner, Briana L.; Aubert, Maxime; Lees, Wendy; Antón, Susan C.

    2011-01-01

    Homo erectus was the first human lineage to disperse widely throughout the Old World, the only hominin in Asia through much of the Pleistocene, and was likely ancestral to H. sapiens. The demise of this taxon remains obscure because of uncertainties regarding the geological age of its youngest populations. In 1996, some of us co-published electron spin resonance (ESR) and uranium series (U-series) results indicating an age as young as 35–50 ka for the late H. erectus sites of Ngandong and Sambungmacan and the faunal site of Jigar (Indonesia). If correct, these ages favor an African origin for recent humans who would overlap with H. erectus in time and space. Here, we report 40Ar/39Ar incremental heating analyses and new ESR/U-series age estimates from the “20 m terrace" at Ngandong and Jigar. Both data sets are internally consistent and provide no evidence for reworking, yet they are inconsistent with one another. The 40Ar/39Ar analyses give an average age of 546±12 ka (sd±5 se) for both sites, the first reliable radiometric indications of a middle Pleistocene component for the terrace. Given the technical accuracy and consistency of the analyses, the argon ages represent either the actual age or the maximum age for the terrace and are significantly older than previous estimates. Most of the ESR/U-series results are older as well, but the oldest that meets all modeling criteria is 143 ka+20/−17. Most samples indicated leaching of uranium and likely represent either the actual or the minimum age of the terrace. Given known sources of error, the U-series results could be consistent with a middle Pleistocene age. However, the ESR and 40Ar/39Ar ages preclude one another. Regardless, the age of the sites and hominins is at least bracketed between these estimates and is older than currently accepted. PMID:21738710

  5. The effects of rainfall regimes and terracing on runoff and erosion in the Three Gorges area, China.

    Science.gov (United States)

    Xu, Qin-Xue; Wu, Pan; Dai, Jun-Feng; Wang, Tian-Wei; Li, Zhao-Xia; Cai, Chong-Fa; Shi, Zhi-Hua

    2018-01-20

    Changes in natural rainfall regimes have taken place and are expected to become more pronounced in future decades. These changes are also likely to be accompanied by changes in crop management practices. The main purpose of this study was to analyze runoff and soil loss in relation to rainfall regimes and terracing in the Three Gorges area, China. Based on 10 years of field observation and k-mean clusters, 101 rainfall events were grouped into three rainfall regimes. Rainfall regime I was the group of events with strong rainfall intensity, high frequency, and short duration. Rainfall regime III consisted of events with low intensity, long duration, and high rainfall amount. Rainfall regime II was the aggregation of events of high intensity and amount, and less frequent occurrence. The results showed that event runoff coefficients were not significantly different among rainfall regimes. However, the average soil erosion rates in rainfall regimes I and II were significantly higher than that in regime III. The average erosion rates under rainfall regimes I, II, and III were 21.6, 39.7, and 9.8 g m -2 , respectively. The effect of rainfall regime on soil erosion also was changed by terracing. On unterraced cropland, soil erosion rate in rainfall regime I is significantly higher than that in regime III. However, the situation did not exist in unterraced orchard. Terracing significantly reduced runoff and soil erosion, and compensated the effects of rainfall regime on soil erosion, which indicated that runoff and erosion in terraced system may be little influenced by climate change. Based on these results, it was suggested more attention should be paid to the timing of rainfall events in relation to crop development and the high erosion on unterraced citrus orchard to control soil erosion in this area.

  6. Faulted terrace risers place new constraints on the late Quaternary slip rate for the central Altyn Tagh fault, northwest Tibet

    Science.gov (United States)

    Gold, R.D.; Cowgill, E.; Arrowsmith, J.R.; Chen, X.; Sharp, W.D.; Cooper, K.M.; Wang, X.-F.

    2011-01-01

    The active, left-lateral Altyn Tagh fault defines the northwestern margin of the Tibetan Plateau in western China. To clarify late Quaternary temporal and spatial variations in slip rate along the central portion of this fault system (85??-90??E), we have more than doubled the number of dated offset markers along the central Altyn Tagh fault. In particular, we determined offset-age relations for seven left-laterally faulted terrace risers at three sites (Kelutelage, Yukuang, and Keke Qiapu) spanning a 140-km-long fault reach by integrating surficial geologic mapping, topographic surveys (total station and tripod-light detection and ranging [T-LiDAR]), and geochronology (radiocarbon dating of organic samples, 230Th/U dating of pedogenic carbonate coatings on buried clasts, and terrestrial cosmogenic radionuclide exposure age dating applied to quartz-rich gravels). At Kelutelage, which is the westernmost site (37.72??N, 86.67??E), two faulted terrace risers are offset 58 ?? 3 m and 48 ?? 4 m, and formed at 6.2-6.1 ka and 5.9-3.7 ka, respectively. At the Yukuang site (38.00??N, 87.87??E), four faulted terrace risers are offset 92 ?? 12 m, 68 ?? 6 m, 55 ?? 13 m, and 59 ?? 9 m and formed at 24.2-9.5 ka, 6.4-5.0 ka, 5.1-3.9 ka, and 24.2-6.4 ka, respectively. At the easternmost site, Keke Qiapu (38.08??N, 88.12??E), a faulted terrace riser is offset 33 ?? 6 m and has an age of 17.1-2.2 ka. The displacement-age relationships derived from these markers can be satisfied by an approximately uniform slip rate of 8-12 mm/yr. However, additional analysis is required to test how much temporal variability in slip rate is permitted by this data set. ?? 2011 Geological Society of America.

  7. Soil Formation and Taxonomy in Yeşilırmak River Terraces

    Directory of Open Access Journals (Sweden)

    Alper Durak

    2014-02-01

    Full Text Available In this study, the soils of which parent material is alluvial and formed Yeşilırmak river terraces were investigated. For this purposes four different profiles were excavated in the study area. Then twenty-seven soil samples were taken from horizons of four profiles and their physical and chemical analyses were done for soil taxonomy research. Profile of Kumocagi and Cakil were classified in subgroup as Typic Ustipsamments, Havaalanı and Mera profiles were classified Typic Haplustolls and Typic Argiustolls subgroups respectively. The pH values of soils varied between 7.38-8.41. These soils can be classified as low and highly basic. Most of the soil series had an irregular pH distribution in the profile. The range of carbonate content of the soils was 0.8-25.4%. Although carbonate content of soils showed a very wide range, majority of them can be classified as highly calcareous. In most of soils carbonate content was distributed irregulary in the profile. Organic matter content were between 0.14-6.11% in the soils. Although organic matter contents of the soils changed in a wide range most of them had low organic matter content. Organic matter content was over 4% in the surface horizon of only two profiles. Research result showed that, alluvial parent material, particle size, topograpy and time have different effect on investigation soils.

  8. Shape and Size of Cobalt Nanoislands Formed Spontaneously on Cobalt Terraces during Fischer-Tropsch Synthesis.

    Science.gov (United States)

    Banerjee, Arghya; Navarro, Violeta; Frenken, Joost W M; van Bavel, Alexander P; Kuipers, Herman P C E; Saeys, Mark

    2016-06-02

    Cobalt-based catalysts undergo a massive and spontaneous reconstruction to form uniform triangular nanoislands under Fischer-Tropsch (FT) conditions. This reconstruction is driven by the unusual and synergistic adsorption of square-planar carbon and CO at the 4-fold edge sites of the nanoislands, driving the formation of triangular islands. The size of the nanoislands is determined by the balance between energy gain from creating C/CO-covered edges and energy penalty to create C/CO-covered corners. For carbon chemical potentials corresponding to FT conditions, triangular Co islands with 45 Co atoms (about 2 nm) are the most stable surface structure. Decreasing the carbon chemical potential and hence the stability of square-planar carbon favors the formation of larger islands, until reconstruction becomes unfavorable and CO-covered terraces are thermodynamically the most stable. The predicted structure of the islands is consistent with in situ scanning tunneling microscopy images obtained for the first time under realistic FT reaction conditions on a Co(0001) surface.

  9. The Improvement of the Ventilation System in the Existing Terraced Houses in Malaysia

    Directory of Open Access Journals (Sweden)

    Arab Yasser

    2016-01-01

    Full Text Available This study aims to find a sustainable solution in order to reduce the indoor temperature in hot and humid climate such as Malaysia. The focus of this study is to create a new device (Air Tube which is considered to be a remedial device for the indoor spaces, and can be installed for the existed houses. The method of this study is to design the Air Tube device and install is in the rooms of second floor in semi-detached and terrace house in order to reduce the temperature few degrees. The study will depend on taking manual measurements in the site and making simulation using computer software Ecotect on 14th of February (which considered to be the hottest day in the year and trying to find the best solution to reduce the temperature in such hot and humid weather, the case study is a semi-detach house with post-modern architectural style, which is located in Sungai Petani, Kedah, Malaysia. The research finds that AirTubeis a good solution for the existed houses to decrease the temperature and reach the thermal comfortable atmosphere.

  10. Raman and SEM analysis of a biocolonised hot spring travertine terrace in Svalbard, Norway

    Directory of Open Access Journals (Sweden)

    Jorge-Villar Susana E

    2007-08-01

    Full Text Available Abstract Background A profile across 8 layers from a fossil travertine terrace from a low temperature geothermal spring located in Svalbard, Norway has been studied using both Raman spectroscopy and SEM (Scanning Electron Microscopy techniques to identify minerals and organic life signals. Results Calcite, anatase, quartz, haematite, magnetite and graphite as well as scytonemin, three different carotenoids, chlorophyll and a chlorophyll-like compound were identified as geo- and biosignatures respectively, using 785 and/or 514 nm Raman laser excitation wavelengths. No morphological biosignatures representing remnant microbial signals were detected by high-resolution imaging, although spectral analyses indicated the presence of organics. In contrast, in all layers, Raman spectra identified a series of different organic pigments indicating little to no degradation or change of the organic signatures and thus indicating the preservation of fossil biomarker compounds throughout the life time of the springs despite the lack of remnant morphological indicators. Conclusion With a view towards planetary exploration we discuss the implications of the differences in Raman band intensities observed when spectra were collected with the different laser excitations. We show that these differences, as well as the different detection capability of the 785 and 514 nm laser, could lead to ambiguous compound identification. We show that the identification of bio and geosignatures, as well as fossil organic pigments, using Raman spectroscopy is possible. These results are relevant since both lasers have been considered for miniaturized Raman spectrometers for planetary exploration.

  11. [Effect of ridge & terraced ecological rice farming on rice photosynthetic characteristics and yield].

    Science.gov (United States)

    Zheng, Hua-Bin; Liu, Jian-Xia; Yao, Lin; He, Hui; Huang, Huang

    2014-09-01

    Taking super hybrid rice Y-liangyou 1, and hybrid rice Xianyou 63 and conventional rice Huanghuazhan as test materials, a field experiment was conducted in Changsha City of Hunan Province in 2011 and 2012 to investigate the effects of ridge & terraced ecological rice farming (RT) and bed ecological rice farming (B) on rice grain yield and photosynthetic characteristics. Compared with conventional rice farming (CK) , yield of Y-liangyou 1 in the RT was increased significantly by 28.7%, the effective panicles per unit area and spikelets per panicle were increased by 16.1% and 6.8%, respectively. Yields of Xianyou 63 and Huanghuazhan in the RT and B were 24.3% and 19.7%, 12.0% and 16.2% higher than those of CK, respectively. Leaf area index, dry matter accumulation before and after full-heading, total dry matter accumulation of Y-liangyou 1 in the RT was higher than that of CK. Number of spikelets/leaf area, number of filled grains/leaf area, grain mass/leaf area of Y-liangyou 1 in the RT were 8.1%, 14.8% and 15.8% higher than those of CK, respectively, the photosynthetic potential was increased by 32.2% while the net assimilation rate was declined by 9.3%.

  12. The mass balance of soil evolution on late Quaternary marine terraces, northern California

    Science.gov (United States)

    Merritts, Dorothy J.; Chadwick, Oliver A.; Hendricks, David M.; Brimhall, George H.; Lewis, Christopher J.

    1992-01-01

    Mass-balance interpretation of a soil chronosequence provides a means of quantifying elemental addition, removal, and transformation that occur in soils from a flight of marine terraces in northern California. Six soil profiles that range in age from several to 240,000 yr are developed in unconsolidated, sandy-marine, and eolian parent material deposited on bedrock marine platforms. Soil evolution is dominated by (1) open-system depletion of Si, Ca, Mg, K, and Na; (2) open-system enrichment of P in surface soil horizons; (3) relative immobility of Fe and Al; and (4) transformation of Fe, Si, and Al in the parent material to secondary clay minerals and sesquioxides. Net mass losses of bases and Si are generally uniform with depth and substantial, in some cases approaching 100 percent; however, the rate of loss of each element differs markedly, causing the ranking of each by relative abundance to shift with time. Loss of Si from the sand fraction by dissolution and particle-size diminution, from about 100 percent to less than 35 percent over 240 ky, mirrors a similar gain in the silt and clay size fractions. The Fe originally present in the sand fraction decreases from greater than 80 percent to less than 10 percent, whereas the amount of Fe present in the clay and crystalline oxyhydroxide fractions increases to 25 percent and 70 percent, respectively.

  13. Developing a Luminescence Chronology for Fan-terrace Sediments, Los Cabos, Baja California, Mexico

    Science.gov (United States)

    Rhodes, E. J.; Brown, N. D.; Antinao, J.; Huenupi, E. C.; Baker, S. E.; McDonald, E.

    2012-12-01

    Extensive depositional units forming large terrace units within alluvial fans close to the southern tip of Baja California, Mexico, record sedimentation under a very different climatic regime from the present. Dating these sediments presents significant challenges; they contain very sparse organic material suitable for radiocarbon dating; their upper surfaces are heavily bioturbated, in some places eroded and in other locations show signs of continued deposition even after incision and base level fall, rendering them difficult to date using TCN (terrestrial cosmogenic nuclide) methods. Locations that have experienced significant regional tectonic influences associated with rapid erosion (e.g. Transverse Ranges, California, Southern Alps, New Zealand, Himalaya and Tibet) are typically not well-suited for quartz OSL (optically stimulated luminescence) application owing to low signal sensitivity. For this reason, our efforts to develop a chronology for the sandy sediments that characterize these contexts have focussed on IRSL dating of K-feldspar, using newly developed post-infrared IRSL (infra-red stimulated luminescence) approaches. We explore the relative advantages of different techniques, and methods to assess both the degree of incomplete zeroing and signal fading. In particular, we explore how novel single grain IRSL measurements of K-feldspar can be applied to these and similar high energy deposits on timescales ranging from the last 100,000 years to a few decades. Based on our chronology coupled with detailed sedimentological and soil stratigraphy investigations, we are able to exploit these deposits as valuable archives of past environmental and climatic change.

  14. The Effect of Roof Angles on Indoor Air Temperatures in Terrace Houses in Malaysia

    Directory of Open Access Journals (Sweden)

    A. B. Ramly

    2006-12-01

    Full Text Available The main aim of energy efficiency in building design is to create buildings that utilise minimum amount of energy while meeting the comfort standards as high as or higher than those provided by conventional buildings.To achieve these standards, it is necessary to study the local environment in order to assess its positive and negative features (impact on the building. The results will provide a basic understanding of heat transfer and human thermal comfort requirements. It also provides foundation for which an energy efficient design of buildings can be established. The design of residential buildings has a significant impact on everyday lives of people. It includes the types and forms of buildings that are commonly occupied by people. In Malaysia, the 'terrace house' constitutes the majority of the residential building stock on which this study is based. The study considers the effects of the different roof angles on reducing solar gain and indoor temperatures through eight directions within 24 hours. To analyse and explain that effect, five different angles of roof were chosen for the simulations. In general, all the angles were chosen due 10 their architectural design characteristics. These angles start from 0 degree as a horizontal flat roof to 60 degrees, i.e. increment of every 15 degrees. The research is seen as providing a tool in evaluating the dynamic indoor air temperature and the effect of roof angles. The evaluation is derived from a series of computer simulations using commercially available software called BLAST.

  15. Spatial Regularities of Placing the Halophytic Associations of Elton Lakeside Terrace

    Directory of Open Access Journals (Sweden)

    Kanishchev Sergey Nikolaevich

    2014-02-01

    Full Text Available The article shows the results of research carried out in 2012-2013 in the Eltonsky natural park. This area is located in the southeast of the European part of Russia and includes Elton Lake and its surrounding landscapes - one of the most valuable natural territorial complexes of southern Russia. The objective of the research is to reveal patterns of distribution of halophytic associations. The author applies the method of landscape profiling, conducts geobotanical descriptions and selects soil samples to determine soil moisture coefficient over the horizons. The results of this study characterize the patterns of distribution of halophytic plant associations of Elton lakeside terrace. The article presents the dependence of the distribution of plant associations basin lake Elton depending on soil moisture and relative elevation. The results indicate that the highest soil moisture is observed at the depths of 35-55 cm. Landscaped profiles showed that Halocnemum strobilaceum and Atriplex cana occupy micro lowlands. The land, located over the surrounding space is covered with Suaeda salsa and cereal associations. The communities of Salicornia perennans dominate in the vast fields of salt lakeside. Phragmites australis prevails along the edge of the Malaya Smorogda river.

  16. SOME DATA REGARDING THE LAKE DEPOSITS LOCATED ON THE DANUBE TERRACES

    Directory of Open Access Journals (Sweden)

    C. Grigoras

    2006-10-01

    Full Text Available The research made on the Danube left terraces, within the area where the river enters the Romanian Plain, brought to the identification of certain lake deposits with a high content of carbonate of calcium and magnesium. The genesis of these deposits has been mainly favoured by the temperate - continental climate, which, during the warm period of the year, disturbs the ionic equilibrium of the lake water, leading to the precipitation of the carbonates. Another favourable factor was the fact that the aquifer represented the main supplying source of the lakes. The bicarbonate - calcium - magnesium water continuously supported the precipitation of the carbonates. The evolution in time from the stage of a lake to that of a swamp brought to the replacement of the carbonates accumulation process with the process of organic matter accumulation. Thus, it appeared a bi-stratified deposit with a layer rich in organic matter at the surface, followed by another layer rich in carbonates of calcium and magnesium.

  17. The Tarawera eruption, Lake Rotomahana, and the origin of the Pink and White Terraces

    Science.gov (United States)

    Keam, Ronald F.

    2016-03-01

    This chapter introduces the historical and geographical background for the scientific studies at Tarawera and Lake Rotomahana in the Taupo Volcanic Zone of New Zealand as detailed in this Special Issue of the Journal of Volcanology and Geothermal Research. It also presents the results of some original investigations. These are based partly on the large body of historical information that exists about the 1886 Tarawera eruption and the geothermal system at Rotomahana, and partly on the results of dedicated geological studies by other researchers within the Okataina Volcanic Centre where the historical events took place. Specifically, the new material here presented includes a detailed analysis of a previously almost neglected narrative by the only observer to witness the 1886 eruption from the southeast of the erupting craters and leave an account of his observations. The importance of a co-operative interplay between pre-existing tectonic deformation and its responses to strong seismic activity induced by magmatic intrusion is emphasised as being a major determinant in the course of the eruption, and as the main trigger of the eruption explosions that were audible throughout half of the land area of New Zealand. The chapter then concentrates on showing how the recent geological studies, in conjunction with ideas on the architecture of geysers, permit an explanation to be given as to how the unique Pink and White Terraces came to be formed.

  18. Touhuanping Fault, an active wrench fault within fold-and-thrust belt in northwestern Taiwan, documented by spatial analysis of fluvial terraces

    Science.gov (United States)

    Ota, Yoko; Lin, Yu-Nung Nina; Chen, Yue-Gau; Matsuta, Nobuhisa; Watanuki, Takuya; Chen, Ya-Wen

    2009-09-01

    This study aims at the recent activity and development of an active wrench fault, the Touhuanping Fault in northwestern Taiwan. Northwestern Taiwan has been proposed in a current situation between the mature to waning collision in terms of tectonic evolution. The main drainage in this area, the Chungkang River, flows close to the trace of the fault mentioned above. We examined various types of deformation of fluvial terraces along the Chungkang River as a key to understanding the nature and rate of the late Quaternary tectonics. The E-W trending Touhuanping Fault has long been mapped as a geological boundary fault, but its recent activity was suspected. Field survey revealed that its late Quaternary activity is recorded in the offset fluvial terraces. Our result shows dextral slip and vertical offset with upthrown side on the south, and activated at least twice since the emergence of terrace 4 (older terrace 3 with OSL date of ca. 80 ka). Total amount of offset recorded in the Touhuanping terrace sequence is 15 m for dextral and 10 m for vertical offset. Estimated recurrence time of earthquake rupture may be a few tens of thousand years. Uplift on the upthrown side of the Touhuanping Fault also resulted in the formation of drowned valleys which were graded to terrace 4. Other deformation features, such as back-tilting, westward warping, and a range-facing straight scarp, were also identified. A second-order anticline roughly parallel to the Touhuanping Fault is suggested to be the origin of the northward tilting on terrace 3; it could have resulted from a flower structure on the Touhuanping Fault at shallow depth. This may demonstrate that the buried segment of the Touhuanping Fault has also been active since 80 ka. In the northern study area, the westward warping at terrace 2 probably represents late Quaternary activity of another NE-SW trending Hsincheng Fault.

  19. Assessment of Differential Uplift Along South Java, Indonesia from Terrace Elevations Mapped with Structure from Motion Photogrammetry

    Science.gov (United States)

    Andreini, J.; Bunds, M. P.; Harris, R. A.; Yulianto, E.; Horns, D. M.; Prasetyadi, C.; Putra, P. S.

    2016-12-01

    Assessment of Differential Uplift Along South Java, Indonesia from Terrace Elevations Mapped with Structure from Motion Photogrammetry Jeremy Andreini, Michael Bunds, Ronald Harris, Eko Yulianto, Carolus Prasetyadi, Daniel Horns, Purna Putra Is differential uplift occurring on the south coast of Java? Java is on the southern edge of the Sunda plate, above the subducting Indo-Australian plate. Its south coast is 300 km north of the Java Trench and south of the volcanic arc that runs the length of Java. We are investigating relations between marine terraces and convergence, normal faulting associated with tectonically induced basin subsidence, eustatic sea level change, and variations in sediment supply from volcanic activity. Exposed bedrock along the coast includes upper Miocene basinal limestone, and localized exposure of underlying Miocene reef deposits and Oligo-miocene volcanic basement. Differential uplift in the past is implied by north-south trending horst-like ridges of Miocene reef sediment and volcanic basement that have been exhumed from greater depth than adjacent upper Miocene strata. We utilized Quaternary terrace elevations at four locations (Pangamalang, Pangandaran, Karanghawu, and Pacitan). Elevations were measured using traverses with handheld GPS units, profiles made with RTK GPS, and digital surface models (DSMs).The DSMs have 5 cm pixels and were constructed using structure-from-motion (SfM) software to process photos collected with quadcopters equipped with a 24 Mpixel Sony A5100 camera; their vertical RMS error relative to checkpoints measured on bare ground is 6 cm. SfM processing was done in the field with a specially built portable workstation. Four sets of terraces (T) with the following elevations were identified: T1 0-.5 m, T2 2 m, T3 17 m, T4 22 m. We interpret T1 to be the modern wave-cut platform, T2 to represent Holocene uplift of a Holocene terrace or possibly modern deposition, T3 to result from Marine Isotope Stage 5e. T4 occurs

  20. 100-kyr fluvial fill terrace cycles since the Middle Pleistocene in the southern Central Andes, Toro Basin, NW Argentina

    Science.gov (United States)

    Tofelde, Stefanie; Schildgen, Taylor F.; Bookhagen, Bodo; Savi, Sara; Pingel, Heiko; Wickert, Andrew D.; Wittmann, Hella; Alonso, Ricardo N.; Strecker, Manfred R.

    2017-04-01

    Fluvial fill terraces in intermontane basins are valuable sedimentary and geomorphic archives that record tectonic and/or climate- driven changes of river networks and their adjacent hillslopes. However, the rarely complete preservation of such geomorphic features, often combined with large distances from sediment source areas, complicates the identification of causal links between tectonic/climatic forcing mechanisms and landscape response, especially over timescales of 105 to 106 years. The intermontane Quebrada del Toro Basin in the Eastern Cordillera of NW Argentina contains at least five fluvial terrace-surface remnants that have been sculpted into a succession of several-hundred-meter-thick Quaternary gravel conglomerate. These terraces can be followed over several tens of kilometers and are located in the higher part of the basin, close to the sediment source areas. In this study, we determined the onset of multiple river incision phases by dating the abandonment of the three most extensive and best preserved terrace surfaces with nine cosmogenic 10Be-depth profiles. The timing of terrace-gravel deposition is based on four cosmogenic 26Al/10Be burial ages and U-Pb zircon age estimates of three intercalated volcanic ashes in the conglomeratic fill. The 10Be depth profile ages suggest a successive abandonment of these terrace surfaces with a 100-kyr-cyclicity between 487 ± 34 ka and 75 ± 7 ka. Depositional ages of the conglomerates, determined by 26Al/10Be burial samples and U-Pb zircon ages, range from 936 ± 170 ka to 18 ± 141ka. They show a clear overlap with the terrace-surface abandonment ages and thus indicate the existence of multiple cut-and-fill cycles. Although the initial onset of aggradation of the Quaternary gravel conglomerate at ˜1 Ma and the overall net fluvial incision since ˜0.5 Ma can be linked to tectonic processes affecting the narrow basin outlet, the superimposed 100-kyr-cycles of aggradation and incision are best explained by

  1. Housing Space Quality towards Quality Of Life: A Case Study of Double Storey Terrace Houses

    Directory of Open Access Journals (Sweden)

    Bakar Aniza Abu

    2016-01-01

    Full Text Available The success of every housing area is determined by its user satisfaction level, living there. The quality of the house, its spaces within the unit, housing neighbourhood and green open space can directly influence the quality of life. Limitation of space following high land cost in an urban area, evaluation of the housing environment as a whole including the green open space needs to be studied as it affects the residents’ satisfaction level. This study concentrates on spaces within a housing area to evaluate the residents’ level of satisfaction of the Taman Melati Mastika (TMM, Kuala Lumpur and to understand how they perceived their quality of life through the housing environment and the availability of green open space. Thus, this research was carried out through site observation and analysis, and self-administered questionnaire survey. 247 questionnaire surveys were distributed to the residents of TMM and (n=62 responded. When focused on the housing unit, this study provides insight on the types of outdoor spaces (front yard-front lane and backyard-back lane and their elements and utilization, and quality of housing spaces toward users’ quality of life in TMM, Kuala Lumpur. On the green open space, the assessment of the quality of life is based on three factors that are the safety level of the neighbourhood and park, health issues related to housing environment and park as well as the satisfaction on the housing amenities and park facilities. The result of this study suggests that the residents are satisfied with the existing spaces within their compound and adjacent to it and this lead towards the overall satisfaction living in the area. The quality of space and good utilisation of housing areas can lead towards a better quality of life in the Terrace housing area is confirmed.

  2. A watershed-scale assessment of cost-effectiveness of sediment abatement with flow diversion terraces.

    Science.gov (United States)

    Yang, Qi; Zhao, Zhengyong; Benoy, Glenn; Chow, Thien Lien; Rees, Herb W; Bourque, Charles P-A; Meng, Fan-Rui

    2010-01-01

    Soil conservation beneficial management practices (BMPs) are effective at controlling soil loss from farmlands and minimizing water pollution in agricultural watersheds. However, costs associated with implementing and maintaining these practices are high and often deter farmers from using them. Consequently, it is necessary to conduct cost-benefit analysis of BMP implementation to assist decision-makers with planning to provide the greatest level of environmental protection with limited resources and funding. The Soil and Water Assessment Tool (SWAT) was used to evaluate the efficacy of flow diversion terraces (FDT) in abating sediment yield at the outlet of Black Brook Watershed (BBW), northwestern New Brunswick. Different FDT-implementation scenarios were expressed as the ratio of land area protected by FDT to the total cultivated area. From this analysis, we found that average annual sediment yield decreased exponentially with increased FDT protection. When the proportion of FDT-protected areas was low, sediment reductions caused by FDT increased sharply with increasing use of FDT. Similarly, marginal sediment yield abatement costs (dollar per tonne of sediment reduction) increased exponentially with increasing proportion of FDT-protected area. The results indicated that increasing land protection with FDT from 6 to 50% would result in a reduction of about 2.1 tonne ha(-1) yr(-1) and costs of sediment reduction increased from $7 to $12 per tonne. Increasing FDT-protected cropland from 50 to 100%, a reduction of about 0.9 tonne of sediment ha(-1) yr(-1) would occur and the costs would increase from $12 to $53 per tonne of sediment yield reduction.

  3. Agricultural terraces montoring and modeling: a field survey in Chianti region, Firenze, Italy – Second part

    Science.gov (United States)

    Preti, Federico; Caruso, Marco; Dani, Andrea; Cassiani, Giorgio; Romano, Nunzio; Tarolli, Paolo

    2015-04-01

    The two abstracts present the design and set-up of an experimental campaign which aims at sup-porting the modeling (conceptual and numerical) of water circulation in a terraced slope, and its in-fluence on stability of retaining dry stone walls. The case study is located at "Fattoria di Lamole" (Greve in Chianti, Firenze, Italy). At Lamole site both ancient and recently restored or rebuilt (with different techniques) dry stone walls are present. Furthermore the intense vineyards cultivation makes it very representative in terms of range of external stresses that affect both hillslopes and wall. The survey is developed within the bigger framework of landscape preservation as a way to prevent hydrogeological instabilities and landslide risks. Second Part A second effort is devoted to couple hydrological, hydraulic and geotechnical modeling: - Flow directions and the drainage area have been derived from DTM (high-resolution digital terrain model obtained by a terrestrial laser scanner.), and served for the RPII index calcula-tion (Tarolli et al., 2013), that is coherent with the critical spots observed in situ and marked with GPS. - Direct shear test on undisturbed and reconstituted soil samples will offer an estimation of the Mohr-Coulomb failure envelope parameters (friction angle and cohesion). - Retention curves related with different depths have been derived. - Geoelectric analysis in order to locate the bedrock and to determine the subterranean water flows originated from controlled infitration tests (1 l/s discharge). - A simple dry-wall stability model has been carried out; this model analyses the wall stability with finite elements method, evaluating pressures derived from uphill water infiltration, stone friction and buoyancy in retaining wall layers: simulated deformation are suitable with the observed ones. Acknowledgements Italian Research Project of Relevant Interest (PRIN2010-2011), prot. 20104ALME4, National network for monitoring, modeling, and

  4. Post-tectonic landscape evolution in NE Iberia using staircase terraces: Combined effects of uplift and climate

    Science.gov (United States)

    Lewis, Claudia J.; Sancho, Carlos; McDonald, Eric V.; Peña-Monné, José Luis; Pueyo, Emilio L.; Rhodes, Edward; Calle, Mikel; Soto, Ruth

    2017-09-01

    River incision into bedrock resulting from the combined effects of tectonic uplift and climate governs long-term regional landscape evolution. We determined spatial and temporal patterns of post-orogenic stream incision from a sequence of well-preserved staircase terraces developed over the last 1 Ma in the Central Pyrenees and its southern foreland Ebro basin (NE Spain). Extensive remnants of ten vertically separated terraces (Qt1 to Qt10, from oldest to youngest) were mapped along 170 km of the Cinca River valley, transverse to the Pyrenean mountain belt. Multiple outcrops appear in the upper reach of the valley (Ainsa sector, 50 km from headwaters) as well as in the lower reach (Albalate sector, 125 km from headwaters). Fluvial incision into bedrock was calculated using (i) differentially corrected GPS measurements of the altitude of straths and (ii) numerical dating of alluvial sediments from the lower terraces (Qt5 to Qt9) by Optically Stimulated Luminescence, previously reported by Lewis et al. (2009), and supplemented with new dates for the upper terraces (Qt1, Qt2 and Qt3) based on paleomagnetism and supported by soil development. Considering altitude differences and the elapsed time between successive well preserved terrace couples (Qt3-Qt7, Qt7-Qt9 and Qt9-Active channel), mean bedrock incision rates ranged from 0.76 to 0.38 m ka- 1, at the upper reach of the valley (Ainsa section), and from 0.61 to 0.20 m ka- 1, at the lower reach (Albalate section). River incision along the valley produced vertically separated, near-parallel longitudinal terrace profiles evidencing a rapid near-uniform regional uplift as response to (i) the tectonic lithospheric thickening in NE Iberia and (ii) the erosional download rebound related to the Ebro basin exorheism. Moreover, a subtle upstream divergence of strath profiles may have been a consequence of an increase in uplift rate toward the head of the valley. Additionally, incision rates changed over time as indicate

  5. Redesigning Terraced Social Housing in the UK for Flexibility Using Building Energy Simulation with Consideration of Passive Design

    Directory of Open Access Journals (Sweden)

    Hasim Altan

    2015-05-01

    Full Text Available A chosen case study house forms the basis of this paper, which is a pilot energy-efficient social housing project, completed by one of the largest housing developers in the UK. The main aim of this study is to inform the redesign of flexible energy-efficient housing units. The housing, designed for social tenants, was built by the Accent Group in 2005, using modern construction methods and sustainable materials, based on extensive research from the adaptable and “Grow Home” principles of Avi Friedman as well as open building implementation. The first pilot scheme was designed in collaboration with the Building Energy Analysis Unit at the University of Sheffield, together with the Goddard Wybor Practise, and was a successful housing development with respect to being environmentally friendly and a low-energy design scheme for the UK climate. This paper presents redesigning of flexible terraced housing units, and their performance evaluation, using a building simulation method as well as the passive-house planning package. The aim was to plan a row of terraced houses that can not only utilize a flexible design concept in floor planning layout, but also to reduce energy consumption with a passive design with particular attention paid to material selection. In addition, building simulation work has been carried out with the use of DesignBuilder software for both thermal and energy performance evaluation. The study examines the annual energy performance and comfort conditions in the designed house to be situated in the Northeast of England, UK. A terraced house unit design is considered a flexible home that can adjust to the needs of different tenants for the purpose of achieving a sustainable building under different aspects, such as low energy, low carbon, use of renewables, and low impact materials, with flexibility by design.

  6. Digital data sets that describe aquifer characteristics of the Tillman terrace and alluvial aquifer in southwestern Oklahoma

    Science.gov (United States)

    Becker, C.J.; Runkle, D.L.; Rea, Alan

    1997-01-01

    ARC/INFO export and nonproprietary format files This diskette contains digitized aquifer boundaries and maps of hydraulic conductivity, recharge, and ground-water level elevation contours for the Tillman terrace and alluvial aquifer in southwestern Oklahoma. The Tillman terrace aquifer encompasses the unconsolidated terrace deposits and alluvium associated with the North Fork of the Red River and the Red River in the western half of Tillman County. These sediments consist of discontinuous layers of clay, sandy clay, sand, and gravel. The aquifer extends over an area of 285 square miles and is used for irrigation and domestic purposes. Granite and the Hennessey Formation outcrop in northern parts of the aquifer where alluvial deposits are absent. These outcrops were included as part of the aquifer in a thesis that modeled the ground-water flow in the aquifer. Most of the aquifer boundaries and some of the lines in the hydraulic conductivity and recharge data sets were extracted from a published digital surficial geology data set based on a scale of 1:250,000. Most of the lines in the hydraulic conductivity, recharge, and 1969 water-level elevation contour data sets, and one line in the aquifer boundary data set were digitized from a paper map published at a scale of 1:249,695 in a thesis in which the ground-water flow in the aquifer was modeled. Ground-water flow models are numerical representations that simplify and aggregate natural systems. Models are not unique; different combinations of aquifer characteristics may produce similar results. Therefore, values of hydraulic conductivity and recharge used in the model and presented in this data set are not precise, but are within a reasonable range when compared to independently collected data.

  7. The strategies of local farmers' water management and the eco-hydrological effects of irrigation-drainage engineering systems in world heritage of Honghe Hani Rice Terraces

    Science.gov (United States)

    Gao, Xuan

    2017-04-01

    Terraces are built in mountainous regions to provide larger area for cultivation,in which the hydrological and geomorphological processes are impacted by local farmers' water management strategies and are modified by manmade irrigation-drainage engineering systems.The Honghe Hani Rice Terraces is a 1300a history of traditional agricultural landscape that was inscribed in the 2013 World Heritage List.The local farmers had developed systematic water management strategies and built perfect irrigation-drainage engineering systems to adapt the local rainfall pattern and rice farming activities.Through field investigation,interviews,combined with Geographic Information Systems,Remote Sensing images and Global Positioning Systems technology,the water management strategies as well as the irrigation-drainage systems and their impacts on eco-hydrological process were studied,the results indicate:Firstly,the local people created and maintained an unique woodcarving allocating management system of irrigating water over hundreds years,which aids distributing water and natural nutrition to each terrace field evenly,and regularly according to cultivation schedule.Secondly,the management of local people play an essential role in effective irrigation-drainage engineering system.A ditch leader takes charge of managing the ditch of their village,keeping ample amount of irrigation water,repairing broken parts of ditches,dealing with unfair water using issues,and so on.Meanwhile,some traditional leaders of minority also take part in.Thus, this traditional way of irrigation-drainage engineering has bringed Hani people around 1300 years of rice harvest for its eco-hydrological effects.Lastly we discuss the future of Honghe Hani Rice Terraces,the traditional cultivation pattern has been influenced by the rapid development of modern civilization,in which some related changes such as the new equipment of county roads and plastic channels and the water overusing by tourism are not totally

  8. 100 kyr fluvial cut-and-fill terrace cycles since the Middle Pleistocene in the southern Central Andes, NW Argentina

    Science.gov (United States)

    Tofelde, Stefanie; Schildgen, Taylor F.; Savi, Sara; Pingel, Heiko; Wickert, Andrew D.; Bookhagen, Bodo; Wittmann, Hella; Alonso, Ricardo N.; Cottle, John; Strecker, Manfred R.

    2017-09-01

    Fluvial fill terraces in intermontane basins are valuable geomorphic archives that can record tectonically and/or climatically driven changes of the Earth-surface process system. However, often the preservation of fill terrace sequences is incomplete and/or they may form far away from their source areas, complicating the identification of causal links between forcing mechanisms and landscape response, especially over multi-millennial timescales. The intermontane Toro Basin in the southern Central Andes exhibits at least five generations of fluvial terraces that have been sculpted into several-hundred-meter-thick Quaternary valley-fill conglomerates. New surface-exposure dating using nine cosmogenic 10Be depth profiles reveals the successive abandonment of these terraces with a 100 kyr cyclicity between 75 ± 7 and 487 ± 34 ka. Depositional ages of the conglomerates, determined by four 26Al/10Be burial samples and U-Pb zircon ages of three intercalated volcanic ash beds, range from 18 ± 141 to 936 ± 170 ka, indicating that there were multiple cut-and-fill episodes. Although the initial onset of aggradation at ∼1 Ma and the overall net incision since ca. 500 ka can be linked to tectonic processes at the narrow basin outlet, the superimposed 100 kyr cycles of aggradation and incision are best explained by eccentricity-driven climate change. Within these cycles, the onset of river incision can be correlated with global cold periods and enhanced humid phases recorded in paleoclimate archives on the adjacent Bolivian Altiplano, whereas deposition occurred mainly during more arid phases on the Altiplano and global interglacial periods. We suggest that enhanced runoff during global cold phases - due to increased regional precipitation rates, reduced evapotranspiration, or both - resulted in an increased sediment-transport capacity in the Toro Basin, which outweighed any possible increases in upstream sediment supply and thus triggered incision. Compared with two

  9. Active folding of fluvial terraces across a `blind' Himalayan deformation front in the Kashmir Himalaya, northwest India.

    Science.gov (United States)

    Gavillot, Y. G.; Meigs, A.; Rittenour, T. M.; Malik, M. O. A.

    2016-12-01

    In Kashmir, the Himalayan Frontal thrust (HFT) is blind, characterized by a broad fold, the Suruin-Mastargh anticline, and displays no emergent faults cutting either limb. A lack of knowledge of the rate of shortening and structural framework of the Suruin-Mastargh anticline hampers quantifying the earthquake potential for the deformation front. Our study utilized the geomorphic expression of dated deformed terraces on the Ujh River in Kashmir. Six terraces are recognized, and four yield multiple optically stimulated luminescence (OSL) and depth profiles terrigenous cosmogenic nuclides (TCN) ages between 53 ka and 0.4 ka. Vector fold restoration of long terrace profiles indicates a deformation pattern characterized by regional uplift across the anticlinal axis and back-limb, and by fold limb rotation on the forelimb. Differential uplift across the fold trace suggests localized deformation. Dip data and stratigraphic thicknesses suggest that a duplex structure is emplaced at depth along the basal décollement, folding the overlying roof thrust and Siwalik-Murree strata into a detachment-like fold. Localized faulting at the fold axis explains the asymmetrical fold geometry. Folding of the oldest dated terrace, suggests rock uplift rates across the Suruin-Mastargh anticline range between 1.8-2.5 mm/yr. Assuming a 25° dipping ramp for the blind structure on the basis of dip data constraints, the shortening rates across the Suruin-Mastargh anticline range between 3.8-5.4 mm/yr since 53 ka. Geodetic data indicate that an 11-12 mm/yr arc-normal shortening rate characterizes the interseismic strain accumulation across the plate boundary due to India-Tibet convergence. These data combined with rates of other active internal faults in the Kashmir Himalaya indicate that the Riasi fault accounts for the remainder 60% of the convergence not taken up by the Suruin-Mastargh anticline. We attribute a non-emergent thrust at the deformation front to reflect deformation controlled

  10. Terraced copper growth deposited onto Teflon AF1600 by the excimer laser irradiation of Cu(hfac)TMVS

    Energy Technology Data Exchange (ETDEWEB)

    Popovici, D.; Piyakis, K.; Sacher, E.; Meunier, M. [Ecole Polytechnique, Montreal, Quebec (Canada)

    1996-12-31

    The authors are studying the feasibility of constructing Cu/fluoropolymer multilayer devices, in an effort to reduce both metal R and insulator C, a necessary condition in VLSI and GSI microelectronic applications. The laser chemical vapor deposition (LCVD) of the organometallic precursor Cu(hfac)TMVS (hexafluoroacetylacetonate)(trimethylvinylsilane) is used to grow copper films on a Teflon AF1600 substrate. Exposure to excimer laser radiation at 248 nm results in a terraced copper growth. A simple model, based on interference effects in the Teflon and copper layers, is presented to account for this structure.

  11. Evaluation of soil carbon pools after the addition of prunings in subtropical orchards placed in terraces

    Science.gov (United States)

    Márquez San Emeterio, Layla; Martín Reyes, Marino Pedro; Ortiz Bernad, Irene; Fernández Ondoño, Emilia; Sierra Aragón, Manuel

    2017-04-01

    The amount of carbon that can be stored in a soil depends on many factors, such as the type of soil, the chemical composition of plant rests and the climate, and is also highly affected by land use and soil management. Agricultural ecosystems are proved to absorb a large amount of CO2 from the atmosphere through several sustainable management practices. In addition, organic materials such as leaves, grass, prunings, etc., comprise a significant type of agricultural practices as a result of waste recycling. The aim of this research was to evaluate the effects of the addition of different organic prunings on the potential for carbon sequestration in agricultural soils placed in terraces. Three subtropical orchards were sampled in Almuñécar (Granada, S Spain): mango (Mangifera indica L.), avocado (Persea americana Mill.) and cherimoya (Annonacherimola Mill.). The predominant climate is Subtropical Mediterranean and the soil is an Eutric Anthrosol. The experimental design consisted in the application of prunings from avocado, cherimoya and mango trees, placed on the surface soil underneath their correspondent trees, as well as garden prunings from the green areas surrounding the town center on the surface soils under the three orchard trees. Control experiences without the addition of prunings were also evaluated. These experiences were followed for three years. Soil samples were taken at4 cm depth. They were dried for 3-4 days and then sieved (avocado prunings and their control soil, and between soils under garden prunings with cherimoya and their control soil. Regarding the water-soluble soil organic carbon, low differences were shown. Differences in mineral-associated and non-oxidable organic carbon fractions were also statistically significant between soils under avocado prunings and their control soil, and between soils under garden prunings with cherimoya and their control soil. No significant differences in any organic carbon pool were founded for the soils

  12. Late Holocene marine terraces of the Cartagena region, southern Caribbean: The product of neotectonism or a former high stand in sea-level?

    Science.gov (United States)

    Ignacio Martínez, J.; Yokoyama, Yusuke; Gomez, Andres; Delgado, Adriana; Matsuzaki, Hiroyuki; Rendon, Esteban

    2010-03-01

    The detailed stratigraphic survey and paleontological study (mollusks, corals, foraminifera and ostracods) of four low-level, ˜3 m, marine terrace sections: Punta Canoas, Manzanillo del Mar, Playa de Oro, and Tierra Bomba Island, from the Cartagena region, southern Caribbean, supplemented with 22 radiocarbon dates, reveals that the northern terraces were deposited as parasequences in a clastic depositional system compared to the Tierra Bomba Island succession that was deposited in a carbonate depositional system between ˜3600 and ˜1700 cal yrs BP. Drier conditions and the southern location of the ITCZ at about 3 ka triggered stronger easterly Trades and more dynamic southwestward sediment drift fed by the Magdalena River mouth, thus promoting the formation of sand spits that ultimately isolated the Cienaga de Tesca coastal lagoon from the Caribbean Sea. Our estimates support the hypothesis that the present position of the terraces is the product of neotectonism rather than a higher 3 ka, sea-level. Upheaval of the terraces varies between ˜3.8 mmyr -1 at Punta Canoas and ˜2.2 mmyr -1 at Tierra Bomba to ˜1.5 mmyr -1 at Manzanillo del Mar and Playa de Oro terraces. Our study corroborates previous contentions on the role of mud diapirism and the dynamics of the Dique Fault as late Holocene upheaval mechanisms.

  13. Hillslope terracing effects on the spatial variability of plant development as assessed by NDVI in vineyards of the Priorat region (NE Spain).

    Science.gov (United States)

    Martínez-Casasnovas, José A; Ramos, María Concepción; Espinal-Utgés, Sílvia

    2010-04-01

    The availability of heavy machinery and the vineyard restructuring and conversion plans of the European Union Common Agricultural Policy (Commission Regulation EC no. 1227/2000 of 31 May 2000) have encouraged the restructuring of many vineyards on hillslopes of Mediterranean Europe, through the creation of terraces to favor the mechanization of agricultural work. Terrace construction requires cutting and filling operations that create soil spatial variability, which affects soil properties and plant development. In the present paper, we study the effects of hillslope terracing on the spatial variability of the normalized difference vegetation index (NDVI) in fields of the Priorat region (NE Spain) during 2004, 2005, and 2006. This index was computed from high-resolution remote sensing data (Quickbird-2). Detailed digital terrain models before and after terrace construction were used to assess the earth movements. The results indicate that terracing by heavy machinery induced high variability on the NDVI values over the years, showing significant differences as effect of the cut and fill operations.

  14. Surface Texture and Crystallinity Variation of ZnTe Epilayers Grown on the Step-Terrace Structure of the Sapphire Substrate

    Science.gov (United States)

    Nakasu, Taizo; Kizu, Takeru; Yamashita, Sotaro; Aiba, Takayuki; Hattori, Shota; Sun, Wei-Che; Taguri, Kosuke; Kazami, Fukino; Hashimoto, Yuki; Ozaki, Shun; Kobayashi, Masakazu; Asahi, Toshiaki

    2016-04-01

    ZnTe/sapphire heterostructures were focused, and ZnTe thin films were prepared on highly mismatched sapphire substrates by molecular beam epitaxy. A sapphire substrate possessing an atomically-smooth step-terrace structure was used to improve the crystallinity and morphology of the produced ZnTe film. The growth mode of the ZnTe thin film on a sapphire substrate with an atomically-smooth step-terrace structure was found to shift to a two-dimensional growth mode, and a ZnTe thin film possessing a flat surface was obtained. The crystallographic properties of the ZnTe film suggested that the resulting layer consisted of a single (111)-oriented domain. The photoluminescence property was also improved, and the interface lattice alignment between the ZnTe and sapphire was also affected by the atomically-smooth step-terrace structure.

  15. Comparison between Urea and Goat Manure as Sources of Nitrogen for Napier Grass Grown on Terraced Hill

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    Rahman, M.M.

    2016-12-01

    Full Text Available Effects of two nitrogen (N sources on dry matter (DM yield and nutritive value of Napier grass were evaluated. The nitrogen (N fertiliser (at rate of 300 kg N ha?1 year?1 was applied by dividing the terraces of a hill under two treatments: T1 (urea and T2 (goat manure. There were three replicates of each treatment arranged within three blocks in a completely randomised design. Grass was cut at about 60?day interval. In the first to fourth harvests, grass receiving manure had higher plant height than those with urea application. Grass receiving manure had higher DM yield than urea in almost all of the cuttings. In the fourth harvest, grass receiving urea contained higher DM and organic matter (OM than manure. Similar result was found for fifth harvest where urea gave higher crude protein (CP than manure. Irrespective of harvesting frequencies, average DM, OM, CP and neutral detergent fibre contents were not significantly different between grasses fertilised with manure and urea. In conclusion, manure is recommended for economical cultivation of Napier grass on terrace of hill.

  16. Nitrogen and Phosphorous Movement Characteristic in Terrace Paddy Field Using Cascade Irrigation System in West Sumatra, Indonesia

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    Darmawan

    2011-05-01

    Full Text Available West Sumatra is one of Indonesian rice bowl. The landscape of this province dominated by mountainous area with beautiful terrace paddy field lied from the middle slope to the lowland. The most common rice cultivation management in this area is application of cascade irrigation system with blanked amount of chemical fertilizer application. This study intends to figure out, whether this kind of paddy field management sustains and friendly to the environment or not. The results showed that cascade irrigation system created some discrepancies in suspended solid (SS, dissolve organic matter (DOM and the nutrient movement characteristic a long the slope. The SS and DOM load and discharge strongly influenced by land preparation activities, while total and available nitrogen (N and phosphorous (P affected by chemical fertilizer application. In the upper part, the amount of chemical fertilizer seemed sufficient, indicated by negative amount of nutrient balance, while lower terrace show some indication of excess nutrient input. To avoid some demerit of cascade irrigation system, chemical fertilizer application should be base on site specific characteristic and taking into account of natural source contribution.

  17. Large eddy simulation of natural ventilation for idealized terrace houses due to the effect of setback distance

    Science.gov (United States)

    Tuan, L.; Abd Razak, A.; Zaki, S. A.; Mohammad, A. F.; Hassan, M. K.

    2015-09-01

    Similar to most tropical countries, Malaysia have low wind speed and airflow characteristics to provide an effective natural ventilation system for comfortable living especially in terrace houses. Even so, by designing them with suitable threshold height/width, H/W, ratio may help reduce heat sink, or even the accumulation of contaminants within the setback distance. Through this study, the downstream building of these terrace houses will be investigated due to the effects from an upstream building. With the use of Large-Eddy Simulation (LES) method, the formation of the vortex within the threshold H/W ratio will be clearly simulated and allow the observation of flow regimes developed by each model. With increasing threshold H/W ratios the models will exhibit some wake interference flow and skimming flow which will determine the negative or positive effect of ventilation from the upstream building towards the downstream building. The airflow characteristics of the downstream house will also be analysed and the most effective layout in providing a better air circulation may be determined. Improving the natural ventilation of such houses could significantly reduce these negative effects such as the accumulation of dust, smoke or bacteria. In turn, with the alarming rate of depletion in natural resources and its effects to the environment, this study can significantly reduce energy usage for ventilation and space cooling.

  18. Why most agricultural terraces in steep slopes in semiarid SE Spain remain well preserved since their abandonment 50 years go?

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    Cantón, F.

    2010-12-01

    Full Text Available A large part of the agricultural terraces in mountain environments are abandoned, like those from the Filabres range in Almería, SE Spain. While many of such terraces show signs of soil erosion (wall disruptions, surface crusts, pipes and gullies, others in steep slopes remain well preserved after 50 years since their abandonment and still seem to play an active role against soil erosion. In order to know both magnitude of soil erosion and controlling factors in different types of abandoned terraces, a rainfall simulation campaign with a portable sprinkler was carried out in 45 representative microsites. Runoff, derived-infiltration and sediment production were measured and their relationships to basic soil parameters (particle size distribution, pH, EC, organic matter content, aggregate stability, geomorphic position, and ground cover, were examined. Under the average applied rainfall intensity (48 mm/h, which represents a precipitation with a return period of 5 years in the area, narrow bench terraces from steep hillslopes, have larger infiltration values and deliver less sediments than large bank terraces in alluvial plains. The presence of stony pavement sieving crusts on narrow-bench terraces and also on un-terraced alluvial fans, play an essential armouring effect against soil erosion while favouring water infiltration. Considerations are made about the evolution of the different types of traditional terraces in the area under both past agricultural and present abandoned status, and also about possible uses under a sustainable land management policy.

    Una gran parte de las terrazas agrícolas en zonas de montaña están abandonadas, como las de la Sierra de los Filabres en Almería, SE de España. Si bien muchas de dichas terrazas muestran señales de erosión hídrica (destrucción de muros, encostramiento superficial, piping y cárcavas, otras en laderas con pendientes acusadas siguen bien conservadas tras 50 años de abandono y

  19. Occupants’ Utilization of Natural Ventilation: A Study of Selected Terrace House Designs in Hot-humid Climate

    Directory of Open Access Journals (Sweden)

    Ibiyeye AI

    2015-05-01

    Full Text Available With increased time spent indoors and demand for enhanced comfort levels, energy consumption in homes is rising mostly for cooling, particularly in hot-humid regions. Natural ventilation is seen as an alternative to mechanical cooling as it is totally independent on energy and has been reported to be of high potential. However, little information is available on the utilization of natural ventilation in individual living spaces in different house designs. Therefore, this paper aims to investigate occupants’ utilization of natural ventilation in living spaces under different terrace house designs in hot-humid climate and also the relationship between the openings and occupants’ satisfaction with natural ventilation. Five (5 different terrace house types in Putrajaya, Malaysia with different opening design characteristics were selected for the study. A total of 298 households from these house types were surveyed and results show that occupants mostly open their windows during the daytime to capture breeze from outside despite the fact that they owned air-conditioners. In terms of occupants’ level of satisfaction with indoor ventilation when utilizing natural ventilation, majority rated neither satisfied nor unsatisfied. Further regression analysis reveals that this level of satisfaction is significantly related to opening sizes that are in accordance with the law, duration of opening windows and AC ownership. Findings from this study will shed more light on behavioural pattern of occupants of residential buildings towards natural ventilation provisions and highlight the importance of conforming to the law governing them.

  20. Controls on dryland mountain landscape development along the NW Saharan desert margin: Insights from Quaternary river terrace sequences (Dadès River, south-central High Atlas, Morocco)

    Science.gov (United States)

    Stokes, M.; Mather, A. E.; Belfoul, M.; Faik, F.; Bouzid, S.; Geach, M. R.; Cunha, P. P.; Boulton, S. J.; Thiel, C.

    2017-06-01

    This study documents river terraces from upstream reaches of the Dadès River, a major fluvial system draining the south-central High Atlas Mountains. Terraces occur as straths with bedrock bases positioned at 10 m altitudinal intervals up to 40 m (T1-T5) above the valley floor, becoming less common between 50 and 140 m. The rock strength, stratigraphy and structure of the mountain belt influences terrace distribution. Terraces are absent in river gorges of structurally thickened limestone; whilst well-developed, laterally continuous terraces (T1-T4) form along wide valleys occupying syncline structures dominated by weaker interbedded limestone-mudstone. Terrace staircases develop in confined canyons associated with weaker lithologies and influence from structural dip and stratigraphic configuration. Terraces comprise a bedrock erosion surface overlain by fluvial conglomerates, rare overbank sands and colluvium. This sequence with some OSL/IRSL age control, suggests terrace formation over a 100 ka climate cycle with valley floor aggradation during full glacials and incision during glacial-interglacial transitions. This integrates with other archives (e.g. lakes, glaciers, dunes), appearing typical of landscape development along the NW Saharan margin south of the High Atlas, and similar to patterns in the western-southern Mediterranean. The 100 ka climate cycle relationship suggests that the terrace sequence documents Late-Middle Pleistocene landscape development. Consistent altitudinal spacing of terraces and their distribution throughout the orogen suggests sustained base-level lowering linked to uplift-exhumation of the High Atlas. Low incision rates (<0.2 mm a-1) and general absence of terrace deformation suggests dominance of isostatically driven base-level lowering with relief generation being Early Pleistocene or older.

  1. Automatic identification of agricultural terraces through object-oriented analysis of very high resolution DSMs and multispectral imagery obtained from an unmanned aerial vehicle.

    Science.gov (United States)

    Diaz-Varela, R A; Zarco-Tejada, P J; Angileri, V; Loudjani, P

    2014-02-15

    Agricultural terraces are features that provide a number of ecosystem services. As a result, their maintenance is supported by measures established by the European Common Agricultural Policy (CAP). In the framework of CAP implementation and monitoring, there is a current and future need for the development of robust, repeatable and cost-effective methodologies for the automatic identification and monitoring of these features at farm scale. This is a complex task, particularly when terraces are associated to complex vegetation cover patterns, as happens with permanent crops (e.g. olive trees). In this study we present a novel methodology for automatic and cost-efficient identification of terraces using only imagery from commercial off-the-shelf (COTS) cameras on board unmanned aerial vehicles (UAVs). Using state-of-the-art computer vision techniques, we generated orthoimagery and digital surface models (DSMs) at 11 cm spatial resolution with low user intervention. In a second stage, these data were used to identify terraces using a multi-scale object-oriented classification method. Results show the potential of this method even in highly complex agricultural areas, both regarding DSM reconstruction and image classification. The UAV-derived DSM had a root mean square error (RMSE) lower than 0.5 m when the height of the terraces was assessed against field GPS data. The subsequent automated terrace classification yielded an overall accuracy of 90% based exclusively on spectral and elevation data derived from the UAV imagery. Copyright © 2014 Elsevier Ltd. All rights reserved.

  2. Uplift rates of marine terraces as a constraint on fault-propagation fold kinematics: Examples from the Hawkswood and Kate anticlines, North Canterbury, New Zealand

    Science.gov (United States)

    Oakley, David O. S.; Fisher, Donald M.; Gardner, Thomas W.; Stewart, Mary Kate

    2018-01-01

    Marine terraces on growing fault-propagation folds provide valuable insight into the relationship between fold kinematics and uplift rates, providing a means to distinguish among otherwise non-unique kinematic model solutions. Here, we investigate this relationship at two locations in North Canterbury, New Zealand: the Kate anticline and Haumuri Bluff, at the northern end of the Hawkswood anticline. At both locations, we calculate uplift rates of previously dated marine terraces, using DGPS surveys to estimate terrace inner edge elevations. We then use Markov chain Monte Carlo methods to fit fault-propagation fold kinematic models to structural geologic data, and we incorporate marine terrace uplift into the models as an additional constraint. At Haumuri Bluff, we find that marine terraces, when restored to originally horizontal surfaces, can help to eliminate certain trishear models that would fit the geologic data alone. At Kate anticline, we compare uplift rates at different structural positions and find that the spatial pattern of uplift rates is more consistent with trishear than with a parallel-fault propagation fold kink-band model. Finally, we use our model results to compute new estimates for fault slip rates ( 1-2 m/ka at Kate anticline and 1-4 m/ka at Haumuri Bluff) and ages of the folds ( 1 Ma), which are consistent with previous estimates for the onset of folding in this region. These results are consistent with previous work on the age of onset of folding in this region, provide revised estimates of fault slip rates necessary to understand the seismic hazard posed by these faults, and demonstrate the value of incorporating marine terraces in inverse fold kinematic models as a means to distinguish among non-unique solutions.

  3. Late Holocene evolution of playa lakes in the central Ebro depression based on geophysical surveys and morpho-stratigraphic analysis of lacustrine terraces

    Science.gov (United States)

    Gutiérrez, F.; Valero-Garcés, B.; Desir, G.; González-Sampériz, P.; Gutiérrez, M.; Linares, R.; Zarroca, M.; Moreno, A.; Guerrero, J.; Roqué, C.; Arnold, L. J.; Demuro, M.

    2013-08-01

    The origin and morpho-stratigraphic evolution of the largest playa-lake system (La Playa-El Pueyo) in the Bujaraloz-Sástago endorheic area, located in the semiarid central sector of the Ebro Depression, are analysed. The enclosed depressions are developed on gypsiferous Tertiary bedrock and show a prevalent WNW-ESE orientation parallel to the direction of the prevalent strong local wind (Cierzo). Yardangs have been carved in bedrock and unconsolidated terrace deposits in the leeward sector of the largest lake basins. A sequence of three lacustrine terrace levels has been identified by detailed geomorphological mapping. The treads of the upper, middle and lower terrace levels are situated at + 9 m, + 6 m and + 0.5 m above the playa-lake floors, respectively. Seismic refraction and electrical resistivity profiles acquired in La Playa reveal a thin basin fill (~ 2 m) with a planar base. These data allow ruling out the genetic hypothesis for the depressions involving the collapse of large bedrock cavities and support a mixed genesis of combined widespread dissolution and subsidence by groundwater discharge and eolian deflation during dry periods. The 5 m thick deposit of the middle terrace was investigated in hand-dug and backhoe trenches. Six AMS radiocarbon ages from this terrace indicate an aggradation phase between 3.9 ka and ca. 2 ka. These numerical ages yield a maximum average aggradation rate of 2.6 mm/yr and a minimum excavation rate by wind deflation of 3 mm/yr subsequent to the accumulation of the middle terrace. The latter figure compares well with those calculated in several arid regions of the world using yardangs carved in palaeolake deposits. The aggradation phase between 4 and 2 ka is coherent with other Iberian and Mediterranean records showing relatively more humid conditions after 4 ka, including the Iron Ages and the Iberian-Roman Period.

  4. Post-fire suspended sediment dynamics in a Mediterranean terraced catchment using a nested approach

    Science.gov (United States)

    Garcia-Comendador, Julián; Fortesa, Josep; Calsamiglia, Aleix; Calvo-Cases, Adolfo; Estrany, Joan

    2017-04-01

    Wildfires promote serious disturbances in the hydrological and sediment dynamics at catchment scale modifying the runoff generation response and the sediment delivery. The hysteretic loops analyses can help to clarify some landscape changes induced by fire. Accordingly, these spatio-temporal relationships between discharge and sediment transport at event scale enable the location of sediment sources, the availability or depletion of sediment and the precipitation threshold necessary to generate functional hillslope-channel connectivity. In addition, a nested catchment approach allows the characterization of the hydro-sedimentological dynamics in different landscape compartments, observing the incidence of the changes generated in the landscape and its evolution to control soil erosion and to implement useful mitigation practices after fire. In July 2013 a large wildfire (2,450 ha) severely affected the western part of Mallorca (Balearic Islands, Spain). The hydrological and sediment delivery processes were assessed in the first three post-fire hydrological years in a representative catchment when the window of disturbance is typically more open. A nested approach was applied in which two gauging stations (i.e., US 1.2 km2 and DS 4.8 km2) were established in September 2013 with continuous measurement of rainfall, water and sediment yield. At DS, a minimal runoff (i.e., 11 mm with 2% of coefficient) and low sediment yield (i.e., 6.3 t km2 yr-1) were generated on average in the study period in which rainfall averaged amount (i.e., 468 mm ± 141) and intensities were representative of long-term records. The hysteretic analysis allowed a better understanding of the effects of wildfires and terraces in sediment yields. For the whole study period, the percentage distribution was 43% (US; two monitored years) and 40% (DS; three monitored years) for clockwise loops in front of 57% (US) and 60% (DS) for counter clockwise loops. This percentage of counter clockwise loops was

  5. Mapping the environmental risk potential on surface water of pesticide contamination in the Prosecco's vineyard terraced landscape

    Science.gov (United States)

    Pizarro, Patricia; Ferrarese, Francesco; Loddo, Donato; Eugenio Pappalardo, Salvatore; Varotto, Mauro

    2016-04-01

    Intensive cropping systems today represent a paramount issue in terms of environmental impacts, since agricultural pollutants can constitute a potential threat to surface water, non-target organisms and aquatic ecosystems. Levels of pesticide concentrations in surface waters are indeed unquestionably correlated to crop and soil management practices at field-scale. Due to the numerous applications of pesticides required, orchards and vineyards can represent relevant non-point sources for pesticide contamination of water bodies, mainly prompted by soil erosion, surface runoff and spray drift. To reduce risks of pesticide contamination of surface water, the Directive 2009/128/CET imposed the local implementation of agricultural good practices and mitigation actions such as the use of vegetative buffer filter strips and hedgerows along river and pond banks. However, implementation of mitigation actions is often difficult, especially in extremely fragmented agricultural landscapes characterized by a complex territorial matrix set up on urban sprawling, frequent surface water bodies, important geomorphological processes and protected natural areas. Typically, such landscape matrix is well represented by the, Prosecco-DOCG vineyards area (NE of Italy, Province of Treviso) which lays on hogback hills of conglomerate, marls and sandstone that ranges between 50 and 500 m asl. Moreover such vineyards landscape is characterized by traditional and non-traditional agricultural terraces The general aim of this paper is to identify areas of surface water bodies with high potential risk of pesticide contamination from surrounding vineyards in the 735 ha of Lierza river basin (Refrontolo, TV), one of the most representative terraced landscape of the Prosecco-DOCG area. Specific aims are i) mapping terraced Prosecco-DOCG vineyards, ii) classifying potential risk from pesticide of the different areas. Remote sensing technologies such as four bands aerial photos (RGB+NIR) and Light

  6. Temporal dynamics of plant succession in abandoned field in Mediterranean mountain areas: farming terraces and sloping fields (Iberian System, Spain)

    Science.gov (United States)

    Nadal-Romero, Estela; Errea, Paz; Lasanta, Teodoro

    2017-04-01

    Cropland abandonment is an important problem in mountain areas worldwide. This process represents the change from an agricultural management to an abandoned land in which a complex plant succession process occurs, with important hydromorphological effects, and consequences in water resources availability and soil erosion. Literature indicates that plant succession depends on multiple natural factors (soil properties, topography, climate, lithology, and distance to natural covers…) and anthropogenic factors (age of abandonment, management of each field during the cultivation period and after the abandonment…). Despite the advances, much is unknown about the vegetation succession, due to the complexity of ecological and social conditions in which land abandonment occurs. Recently, it is shown that only local factors can explain the heterogeneity of the process (Burel and Baudry, 2002; Jouba and Alados, 2012). In this work, we analyze the diversity of vegetation cover in abandonment fields in Cameros Viejo (Iberian System, Spain), related to the different field patterns (terraces and sloping fields) and the age of abandonment. Agricultural lands were delimited using aerial photographs from 1956 and 1978. The current land cover was obtained from SIOSE (Information System of Land Occupation in Spain). According to our cartography, cultivated land occupied as much as 15,491 ha (39% of the area), remaining abandoned 14,505 ha by 1978. Farming terraces occupied 55.9% of the abandoned area, and 44.1% as sloping fields. On the other hand, our cartography highlights the complexity of current land cover of abandoned fields in a landscape matrix of scrubland. Our results suggest that ecological succession is faster in farming terraces than in sloping fields, mostly until scrubland phase is attained. They also suggest that current land cover is better explained by the physical conditions of each field than by the abandonment age. Acknowledgement This research was supported

  7. Impact of land-use change on soil degradation by establishment of terraces with subtropical orchards in sloping areas (Granada, SE Spain)

    Energy Technology Data Exchange (ETDEWEB)

    Rodriguez Pleguezuelo, C. R.; Duran Zuzo, V. H.; Martin Peinado, F. J.; Franco Tarifa, D.

    2009-07-01

    In the coast of Granada, an intensive irrigated agriculture based on subtropical crops has been established. These trees have been planted in highly sloped areas, by the construction of terraces. In this fragile Mediterranean agroecosystem, the removal of native spontaneous vegetation cover and substitution by orchards, increase the susceptibility to soil degradation and eventually brings up the destruction of these structures by rainfall events. To study this net change, we monitored the soil loss and runoff over a two-year period in the taluses of terraces with a mature mango (Mangifera indica L.) orchard. The studied treatments were bare soil (BS) and spontaneous vegetation (NSV), each twice replicated. The erosion plots were 4 m x 4 m in area and were located in the taluses of orchard in the taluses of orchard terraces (65 degree centigrade slope). The average annual soil loss by erosion for BS and NSV was 2.5 and 0.3 Mg ha{sup -}1 yr{sup -}1, and for runoff 34.1 and 6.8 mm yr{sup -}1, respectively. Therefore, soil erosion and runoff from BS plot were 8- and 5-times higher than in NSV, showing the importance of plant covers in the taluses of terraces in reducing this impact. Thus, the removal of plant cover from the taluses under these conditions, represent a high risk of slump and collapse, causing serious environmental and economic problems for farmers of subtropical crops. (Author) 11 refs.

  8. Late Quaternary chronostratigraphic framework of terraces and alluvium along the lower Ohio River, southwestern Indiana and western Kentucky, USA

    Science.gov (United States)

    Counts, Ronald C.; Murari, Madhav K.; Owen, Lewis A.; Mahan, Shannon; Greenan, Michele

    2015-01-01

    The lower Ohio River valley is a terraced fluvial landscape that has been profoundly influenced by Quaternary climate change and glaciation. A modern Quaternary chronostratigraphic framework was developed for the lower Ohio River valley using optically stimulated luminescence (OSL) dating and allostratigraphic mapping to gain insights into the nature of fluvial responses to glacial–interglacial/stadial–interstadial transitions and Holocene climate change. River deposits, T0 (youngest) to T7 (oldest), were mapped along a 75 km reach of the lower Ohio River and were dated using 46 OSL and 5 radiocarbon samples. The examination of cores combined with OSL and radiocarbon dating shows that fluvial sediments older than marine oxygen isotope stage (MIS) 2 are present only in the subsurface. Aggradation during MIS 6 (Illinoian glaciation) filled the valley to within ∼7 m of the modern floodplain, and by ∼114 ka (MIS 5e/Sangamon interglacial) the Ohio River had scoured the MIS 6 sediments to ∼22 m below the modern floodplain surface. There were no fluvial sediments in the valley with ages between MIS 5e and the middle of MIS 3. The MIS 3 ages (∼39 ka) and stratigraphic position of T5 deposits suggest the Ohio River aggraded 8–14 m during MIS 4 or MIS 3. Near the end of MIS 3, the Ohio River incised the mid Last Glacial (mid-Wisconsinan) deposits ∼10 m and began aggrading again by ∼30 ka. Aggradation continued into MIS 2, with maximum MIS 2 aggradation occurring before ∼21 ka, which is coincident with the global Last Glacial Maximum (LGM). As the Ohio River adjusted to changing fluxes in sediment load and discharge following the LGM, it formed a sequence of fill-cut terraces in the MIS 2 outwash that get progressively younger with decreasing elevation, ranging in age from ∼21 ka to ∼13 ka. From ∼14 ka to ∼13 ka the Ohio River rapidly incised ∼3 m to form a new terrace, and by ∼12 ka at the onset of the Holocene, the Ohio River

  9. Recognition of Pleistocene marine terraces in the southwest of Portugal (Iberian Peninsula: evidences of regional Quaternary uplift

    Directory of Open Access Journals (Sweden)

    Paula M. Figueiredo

    2014-02-01

    Full Text Available Southwest mainland Portugal is located close to the Eurasia-Nubia plate boundary and is characterized by moderate seismicity, although strong events have occurred as in 1755 (Mw≥8, 1969, (Mw 7.9, and more recently in 2007 (Mw 5.9 and 2009 (Mw 5.5, all located in the offshore. No historical earthquakes with onshore rupture are known for this region. At the coastline, high sea cliffs, incised drainages, emergent marine abrasion platforms and paleo sea cliffs indicate that this region is undergoing uplift, although no morphological features were found that could be unequivocally associated with the 1755 mega earthquake. To better understand the recent tectonic activity in this sector of Iberia, it is necessary not only to analyze active structures on land, but also to search for evidence for deformation that may relate to inferred offshore active structures. We thus conducted a study of marine terraces along the coastline to identify regional vertical crustal motions. Several poorly preserved surfaces with thin sedimentary deposits, comprising old beach sediments, were recognized at elevations starting at 2 m elevation and rising inland up to a regional abrasion platform situated at about 120 m a.s.l.. We identified distinct paleo sea level references at several locations at consistent elevations. This terrace sequence is likely Late Pleistocene in age, with individual platforms correlative to MIS 5 high stands and is coherent with a long-term slow uplift of the littoral zone for the southwest of Portugal. Although dating of discrete platforms is an ongoing and difficult task, preliminary correlations of paleo-shoreline elevations suggest that the uplift rate is in the range of 0.1-0.2 mm/yr.

  10. Nano-structure and optical properties (plasmonic) of graded helical square tower-like (terraced) Mn sculptured thin films

    Energy Technology Data Exchange (ETDEWEB)

    Savaloni, Hadi, E-mail: savaloni@khayam.ut.ac.ir [Department of Physics, University of Tehran, North-Kargar Street, Tehran (Iran, Islamic Republic of); Fakharpour, Mahsa [Department of Physics, Islamic Azad University, Science and Research Branch, Tehran (Iran, Islamic Republic of); Siabi-Garjan, Araz [Department of Advanced Technologies, University of Mohaghegh Ardabili, Namin, Ardabil (Iran, Islamic Republic of); Department of Materials Engineering and Nanotechnology, Sabalan University of Advanced Technologies (SUAT), Namin (Iran, Islamic Republic of); Placido, Frank [SUPA and Institute of Thin Films, Sensors and Imaging, University of The West of Scotland, High Street, Paisley (United Kingdom); Babaei, Ferydon [Department of Physics, University of Qom, Qom (Iran, Islamic Republic of)

    2017-01-30

    Highlights: • Graded helical square tower-like terraced sculptured Mn thin films are produced with different number of arms. • XRD, AFM, FESEM and optical analyses as well as theoretical calculations are carried out. • Intensity of Plasmon peaks depend on the polarization, the incident angle, and the distance from the shadowing block. • The presence of defects in these sculptured structures can be predicted by theoretical investigation. • Experimental and theoretical investigations show consistent results. - Abstract: Graded helical square tower-like terraced sculptured Mn thin films (GHSTTS) are produced in three stages with different number of arms using oblique angle deposition together with rotation of substrate holder about its surface normal, plus a shadowing block fixed at the centre of the substrate holder. The structural characterization of the produced samples was obtained using field emission scanning electron microscope (FESEM) and atomic force microscope (AFM). Results showed a structural gradient with distance from the edge of the shadowing block, which in turn is responsible for the decrease in the volume of void fraction and increase of grain size. Plasmon absorption peaks observed in the optical analysis of these nano-structures showed that their wavelength region and intensity depend on the polarization and the incident angle of light, as well as the distance from the edge of the shadowing block. According to our model and discrete dipole approximation (DDA) calculations, when the number of parallel nano-rods of different lengths and radii are increased the peak in the spectrum shifts to shorter wavelengths (blue shift). Also when the diameters of the nano-rods increases (a situation that occurs with increasing film thickness) the results is again a blue shift in the spectrum. The presence of defects in these sculptured structures caused by the shadowing effect is predicted by the theoretical DDA investigation of their optical spectra

  11. Late Pleistocene-Holocene uplift driven terrace formation and climate-tectonic interplay from a seismically active intraplate setting: An example from Kachchh, Western India

    Science.gov (United States)

    Prizomwala, S. P.; Das, Archana; Chauhan, G.; Solanki, T.; Basavaiah, N.; Bhatt, Nilesh; Thakkar, M. G.; Rastogi, B. K.

    2016-07-01

    Fluvial terrace formation is often regulated by external forcings like climate, tectonic and eustatic changes. These terraces, particularly in a dryland environment, preserves the discrete signatures of these external forcings, thus enabling us to reconstruct the fluvial response to the late Quaternary palaeoenvironmental changes and factors governing them. The present study focuses on reconstructing the aggradation/incision phases in the Lotia River which is located in the eastern segment of the Northern Hill Range (NHR) of the Kachchh Peninsula. The Lotia river drains through Mesozoic rocks before cutting across the Kachchh Mainland Fault (KMF) and finally debouch in the Banni Plains. Reconstruction based on tectonic geomorphology, sedimentology, sediment geochemistry, mineral magnetic, and OSL chronology suggests the fluvial response to monsoon variability archived during the last 15 ka. The time frame was also marked by incision enhanced by uplift along the KMF, which led to strath terrace formation. The accommodation space thus created was filled by an aggradational event between 14.8 ka and 10.6 ka. Sedimentological and geochemical parameters have also suggested that the time period between 12.5 ka and 11.5 ka showed a decline in the monsoon strength, which coincides with 'Younger Dryas'. It has been observed that the sediments spanning between 10.6 ka and 7.8 ka are absent from the archive, which is most likely the manifestation of the early Holocene optimum that led to severe erosional processes. The period between 7.8 ka and 3.3 ka is marked as another aggradational phase with fluctuating climatic conditions. At 3.3 ka, the region has experienced an incision of 4 m, which led to the formation of Holocene terrace T1, most likely due to tectonic uplift. During the last 3.3 ka, another pulsative uplift has occurred, which led to the formation of unpaired Holocene terrace T2, along with tilting of the Lotia basin. Based on the OSL chronology of bedrock strath

  12. Sea-level history and tectonic uplift during the last-interglacial period (LIG): Inferred from the Bab al-Mandab coral reef terraces, southern Red Sea

    Science.gov (United States)

    Al-Mikhlafi, Ahmed Saif; Edwards, Lawrence R.; Cheng, Hai

    2018-02-01

    Results of U-series dating of late Pleistocene raised coral reef terraces from the Bab al-Mandab area, define two distinct groups: (1) well-preserved aragonitic fossil corals recorded from the Al-Hajaja terrace (Tr3) yield ages for last-interglacial period (LIG); and (2) calcitic fossil corals recovered from Perim Island terrace (Tr1) show varying degrees of U-series open system behavior and yield coral assemblage ages of LIG and older ages. Fossil corals from Tr1 are recrystallized corals, have anomalously high initial δ234U ranged from (152 ± 2‰ to 287 ± 7‰), corresponding to ages of ∼120 ka and ∼406 ka, respectively. Applying age reliability criteria on the current data suggest majority of the ages cannot be considered reliable and all are suspected for open system behavior associated with U loss/addition that significantly affects the 230Th/U ages. The diagenesis shown by these corals occurred probably due to extensive interaction of fossil corals with freshwater during the wet periods prevailed in southern Arabia coeval with the African monsoon, which led to U loss. Post-depositional U loss suggest (230Th/238U) increase, which shift the U-Th ages to unexpectedly higher levels as it is shown here. Measured elevation at the Al-Hajaja terrace (Tr3) is ∼4 ± 2 m above present sea level (apsl) consistent with eustatic sea level changes and indicates that the Bab al-Mandab area is stable at least since the LIG period. The Perim Island terrace (Tr1) is at elevation of 7 ± 2 m apsl; its reef yields diageneticaly-altered corals of multiple ages and cannot be used for sea level reconstructions.

  13. The role of neotectonics and glaciation on terrace formation along the Nysa Kłodzka River in the Sudeten Mountains (southwestern Poland)

    Science.gov (United States)

    Krzyszkowski, Dariusz; Przybylski, Bogusław; Badura, Janusz

    2000-06-01

    The Nysa Kłodzka river drainage basin in the Sudeten Mts., SW Poland, preserves a complex late Cainozoic succession that includes eight fluvial series or terraces and deposits from two glacial episodes as well as local volcanic rocks, slope deposits and loess. Fluvial sedimentation took place during the Late Pliocene and from the early Middle Pleistocene (Cromerian), with a long erosion phase (gap) during the Early Pleistocene. Fluvial series are dated to the Late Pliocene, Cromerian, Holsteinian, late Saalian/Eemian, Weichselian, and the Holocene. Glacial deposits represent the early Elsterian and early Saalian stages. Almost all these stratigraphic units have been observed in all geomorphic zones of the river: the mountainous Kłodzko Basin, the Bardo Mts. (Bardo gorge) and in the mountain foreland. The main phase of tectonic uplift and strong erosion was during the Early Pleistocene. Minor uplift is documented also during the post-early Saalian and probably the post-Elsterian. The post-early Saalian and post-Elstrian uplift phases are probably due to glacio-isostatic rebound. The Quaternary terrace sequence was formed due to base-level changes, epigenetic erosion after glaciations and neotectonic movements. The Cromerian fluvial deposits/terraces do not indicate tectonic influence at all. All other Quaternary terraces indicate clear divergence, and the post-early Saalian terraces also show fault scarps. The fluvial pattern remained stable, once formed during the Pliocene, with only minor changes along the uplifted block along the Bardo gorge, inferring an antecedent origin for the Bardo gorge. Only during the post-glacial times, have epigenetic incisions slightly modified the valley.

  14. Monitoring tectonic uplift and paleoenvironmental reconstruction for marine terraces near Maǧaracik and Samandaǧ, Hatay Province, Turkey.

    Science.gov (United States)

    Florentin, Jonathan A; Blackwell, Bonnie A B; Tüysüz, Okan; Tarı, Ufuk; Can Genç, Ş; İmren, Caner; Mo, Shirley; Huang, Yiwen E W; Blickstein, Joel I B; Skinner, Anne R; Kim, Maria

    2014-06-01

    Near Hatay, the Antakya-Samandağ-Cyprus Fault (ASCF), East Anatolian and Dead Sea Fault Zones, the large faults that form the edges of the African, Anatolian, Cyprus and Arabian Plates, all produce large earthquakes, which have decimated Hatay repeatedly. Near Samandağ, Hatay, differential vertical displacement on the ASCF has uplifted the southeastern side relative to northwestern side, producing large fault scarps that parallel the Asi (Orontes) River. Tectonic uplift coupled with Quaternary sealevel fluctuations has produced several stacked marine terraces stranded above current sealevel. This study dated 24 mollusc samples from 10 outcrops on six marine terraces near Samandağ electron spin resonance (ESR). Ages were calculated using time-averaged and volumetrically averaged external dose rates, modelled by assuming typical water depths for the individual species and sediment thicknesses estimated from geological criteria. Uplift rates were then calculated for each fault block. At all the Mağaracık terraces, the dates suggest that many shells were likely reworked. On the 30 m terrace at Mağaracık IV (UTM 766588-3999880), Lithophagus burrows with in situ shells cross the unconformity. One such shell dated to 62 ± 6 ka, setting the minimum possible age for the terrace. For all the Mağaracık terraces at ∼30 m above mean sealevel (amsl), the youngest ages for the reworked shells, which averaged 60 ± 3 ka for six separate analyses, sets the maximum possible age for this unit. Thus, the terrace must date to 60-62 ± 3 ka, at the MIS 3/4 boundary when temperatures and sealevels were fluctuating rapidly. Older units dating to MIS 7, 6, and 5 likely were being eroded to supply some fossils found in this terrace. At Mağaracık Dump (UTM 765391-4001048), ∼103 m amsl, Ostrea and other shells were found cemented in growth position to the limestone boulders outcropping there <2.0 m above a wave-eroded notch. If the oysters grew at the same time as the wave

  15. Assessment of the predisposing factors for shallow landslides activation in terraced areas: the case of the Rupinaro catchment, Liguria (northwestern Italy).

    Science.gov (United States)

    Cignetti, Martina; Godone, Danilo; Giordan, Daniele

    2017-04-01

    The shallow landslides occurrence is strongly correlated with climatic conditions and environmental settings. In the Liguria region (northwestern Italy), the landscape presents an ancient human intervention represented by terraces and, in the last century, by a general overbuilding, both in the few flat areas and in the steep slope hinterland. From the twentieth century, the progressive abandonment of agriculture generated a lack of maintenance of terraced areas, which associated to the urban and the road net development, supported the slope susceptibility to instability. This makes the assessment of the predisposing factors for shallow landslides a multidisciplinary task, combining natural and man-made issues. In this work, we try to define all the main predisposing factors of the Rupinaro catchment (southeast Liguria). We operate starting from a high-resolution Digital Terrain Model (DTM) supplied by an airborne LiDAR survey carried out after the autumn 2014 rainfall events. From this DTM, we mapped a total amount of 96 landslides in the study area. Then, we implemented a classification methodology based on a simple parametric score. In GIS environment we overlaid several layers: i) lithological and hydrogeological map, ii) slope iii) aspect, iv) the land use information, available by the CORINE land cover, and iv) the presence of terraces. Each spatial data was than reclassified according a numerical code. The sum, by raster math, of these factors provided an overall score raster for the entire basin. This method allows the characterization of the entire watershed, gathering all the predisposing factors for the shallow landslides activation. A categorization of the landslides area mapped from the DTM and stored in a vector layer has been made. In particular, we estimated the most frequent code within each landslide polygon, obtaining a representative data of the most influential factors that triggered shallow landslides. The results showed the prevalent

  16. Constraints on Paleotsunami Runup Derived from Sand Deposits Mantling Three Holocene Marine Terraces at Puatai Beach, Northern Hikurangi Subduction Margin, New Zealand

    Science.gov (United States)

    Clark, K.; Litchfield, N. J.; Cochran, U. A.; Berryman, K. R.; Power, W. L.; Steele, R.

    2016-12-01

    At Puatai Beach, Gisborne, New Zealand, a 90-m-long continuous trench was excavated across a sequence of three marine terraces. The trench exposed the stratigraphy of deposits mantling the stepped shore platforms. The sequence of shelly sand and gravel beach deposits and silty colluvium allowed us to reconstruct the timing of earthquakes that uplifted the terraces, and place constraints on the age, runup and inundation distances of tsunamis that impacted the coastline in the late Holocene. Radiocarbon ages from shelly beach deposits lying on the platforms were used to date the terrace uplift ages at 1920-1650 (upper), 1270-1030 (middle), and 520-320 (lower) cal. yr BP respectively; we interpret these ages as the timing of large (M7+) paleoearthquakes on the nearshore Gable End Fault. With the inner edge of the highest shore platform reaching 9 m elevation, this flight of terraces has an average uplift rate of 5.6 ± 1 mm/yr, the highest uplift rate along the Hikurangi margin. The silty colluvium layers overlying the beach deposits contain thin semi-continuous sand layers. Based on chronological, geomorphological, sedimentological and biological considerations we suggest that at least some of these sand layers are tsunami deposits. Three sand layers were dated at 1190-930, 400-100, and 450-150 cal. yr BP, and the chronological overlap of the latter two suggests they could be the same event. Estimates of tsunami run-up were obtained from the surveyed maximum heights, and allowing for terrace uplift, they were 9.3 ± 0.5 m, 12.6 ± 0.5 m and 4.2-1.2 ± 0.5 m amsl, for the two dated and one un-dated paleotsunamis respectively; inundation distances were 58 m, 61 m, and 23 m. The inferred tsunami ages are slightly younger than the time of uplift of the marine terraces, and this, as well as their stratigraphic position within colluvium, suggests they were not necessarily triggered by rupture of the Gable End Fault. The younger ages potentially overlap tsunami deposits

  17. Exposure to secondhand smoke in terraces and other outdoor areas of hospitality venues in eight European countries.

    Science.gov (United States)

    López, Maria J; Fernández, Esteve; Gorini, Giuseppe; Moshammer, Hanns; Polanska, Kinga; Clancy, Luke; Dautzenberg, Bertrand; Delrieu, Agnes; Invernizzi, Giovanni; Muñoz, Glòria; Precioso, Jose; Ruprecht, Ario; Stansty, Peter; Hanke, Wojciech; Nebot, Manel

    2012-01-01

    Outdoor secondhand smoke (SHS) concentrations are usually lower than indoor concentrations, yet some studies have shown that outdoor SHS levels could be comparable to indoor levels under specific conditions. The main objectives of this study were to assess levels of SHS exposure in terraces and other outdoor areas of hospitality venues and to evaluate their potential displacement to adjacent indoor areas. Nicotine and respirable particles (PM2.5) were measured in outdoor and indoor areas of hospitality venues of 8 European countries. Hospitality venues of the study included night bars, restaurants and bars. The fieldwork was carried out between March 2009 and March 2011. We gathered 170 nicotine and 142 PM2.5 measurements during the study. The median indoor SHS concentration was significantly higher in venues where smoking was allowed (nicotine 3.69 µg/m3, PM2.5: 120.51 µg/m3) than in those where smoking was banned (nicotine: 0.48 µg/m3, PM2.5: 36.90 µg/m3). The median outdoor nicotine concentration was higher in places where indoor smoking was banned (1.56 µg/m3) than in venues where smoking was allowed (0.31 µg/m3). Among the different types of outdoor areas, the highest median outdoor SHS levels (nicotine: 4.23 µg/m3, PM2.5: 43.64 µg/m3) were found in the semi-closed outdoor areas of venues where indoor smoking was banned. Banning indoor smoking seems to displace SHS exposure to adjacent outdoor areas. Furthermore, indoor settings where smoking is banned but which have a semi-closed outdoor area have higher levels of SHS than those with open outdoor areas, possibly indicating that SHS also drifts from outdoors to indoors. Current legislation restricting indoor SHS levels seems to be insufficient to protect hospitality workers--and patrons--from SHS exposure. Tobacco-free legislation should take these results into account and consider restrictions in the terraces of some hospitality venues to ensure effective protection.

  18. Dynamics of organic carbon pools and microbial diversity over time in anthropogenic terraced soils of Southern Peru

    Science.gov (United States)

    Camilli, Benedetta; Dell'Abate, Maria Teresa; Mocali, Stefano; Fabiani, Arturo; Dazzi, Carmelo

    2014-05-01

    At worldwide level the relevance of anthropized soilscapes has progressively become of prominent importance. Such soilscapes are much diversified according to the multitude of human activities, such as agriculture and forestry (i.e. leveling and terracing, prolonged application of organic amendments, flooding, irrigation and drainage, land use change), which are able to affect the soil genesis and properties, determining a broad range of soil conditions. Although many processes related to long-term agricultural use have deeply influenced the soil properties over a few thousand years, the anthropogenic processes are relatively fast-acting as compared to the natural processes of soil formation, and over the last few years have marked out many areas of the world, also in developing countries. The main objective of this study was to investigate the dynamics of organic carbon pools and the microbial diversity over time in anthropogenic terraced soils in a desert area of Southern Peru (Arequipa). Five sites were selected considering soils cultivated since 5 (P5), 15 (P15), 20 (P20), 35 (P35) and 65 (P65) years and sampled along the profile depth (0-20 cm; 20-40 cm layer). Soil and microbial parameters comprised by organic carbon pools, microbial respiration, microbial community physiological profile (CLPP) and genetic diversity (PCR-DGGE) were determined. The results showed that the highest C concentrations were reached after a long cultivation time (P65), at both depths. In this site Corg was mainly composed by chemically not extractable C, considered the most stabilized or recalcitrant fraction. The remaining extractable C fraction decreased with the depth and was mainly made up of highly mineralizable compounds. However, for the biological pools, soil respiration activity was very low in all samples and the microbial physiological profile suggested that the microbial metabolism is likely related to the amount and the quality of available Corg. The effects of

  19. Exposure to Secondhand Smoke in Terraces and Other Outdoor Areas of Hospitality Venues in Eight European Countries

    Science.gov (United States)

    López, Maria J.; Fernández, Esteve; Gorini, Giuseppe; Moshammer, Hanns; Polanska, Kinga; Clancy, Luke; Dautzenberg, Bertrand; Delrieu, Agnes; Invernizzi, Giovanni; Muñoz, Glòria; Precioso, Jose; Ruprecht, Ario; Stansty, Peter; Hanke, Wojciech; Nebot, Manel

    2012-01-01

    Background Outdoor secondhand smoke (SHS) concentrations are usually lower than indoor concentrations, yet some studies have shown that outdoor SHS levels could be comparable to indoor levels under specific conditions. The main objectives of this study were to assess levels of SHS exposure in terraces and other outdoor areas of hospitality venues and to evaluate their potential displacement to adjacent indoor areas. Methods Nicotine and respirable particles (PM2.5) were measured in outdoor and indoor areas of hospitality venues of 8 European countries. Hospitality venues of the study included night bars, restaurants and bars. The fieldwork was carried out between March 2009 and March 2011. Results We gathered 170 nicotine and 142 PM2.5 measurements during the study. The median indoor SHS concentration was significantly higher in venues where smoking was allowed (nicotine 3.69 µg/m3, PM2.5: 120.51 µg/m3) than in those where smoking was banned (nicotine: 0.48 µg/m3, PM2.5: 36.90 µg/m3). The median outdoor nicotine concentration was higher in places where indoor smoking was banned (1.56 µg/m3) than in venues where smoking was allowed (0.31 µg/m3). Among the different types of outdoor areas, the highest median outdoor SHS levels (nicotine: 4.23 µg/m3, PM2.5: 43.64 µg/m3) were found in the semi-closed outdoor areas of venues where indoor smoking was banned. Conclusions Banning indoor smoking seems to displace SHS exposure to adjacent outdoor areas. Furthermore, indoor settings where smoking is banned but which have a semi-closed outdoor area have higher levels of SHS than those with open outdoor areas, possibly indicating that SHS also drifts from outdoors to indoors. Current legislation restricting indoor SHS levels seems to be insufficient to protect hospitality workers – and patrons – from SHS exposure. Tobacco-free legislation should take these results into account and consider restrictions in the terraces of some hospitality venues to ensure effective

  20. Digital data sets that describe aquifer characteristics of the alluvial and terrace deposits along the North Canadian River from Oklahoma City to Eufaula Lake in east-central Oklahoma

    Data.gov (United States)

    U.S. Geological Survey, Department of the Interior — This data set consists of digital water-level elevation contours for the alluvial and terrace deposits along the North Canadian River from Oklahoma City to Eufaula...

  1. Digital data sets that describe aquifer characteristics of the alluvial and terrace deposits along the Beaver-North Canadian River from the panhandle to Canton Lake in northwestern Oklahoma

    Data.gov (United States)

    U.S. Geological Survey, Department of the Interior — This data set consists of digital hydraulic conductivity values for the alluvial and terrace deposits along the Beaver-North Canadian River from the panhandle to...

  2. Digital data sets that describe aquifer characteristics of the alluvial and terrace deposits along the Beaver-North Canadian River from the panhandle to Canton Lake in northwestern Oklahoma

    Data.gov (United States)

    U.S. Geological Survey, Department of the Interior — This data set consists of digital water-level elevation contours for the Quaternary alluvial and terrace deposits along the Beaver-North Canadian River from the...

  3. Digital data sets that describe aquifer characteristics of the alluvial and terrace deposits along the Beaver-North Canadian River from the panhandle to Canton Lake in northwestern Oklahoma

    Data.gov (United States)

    U.S. Geological Survey, Department of the Interior — This data set consists of digital aquifer boundaries for the alluvial and terrace deposits along the Beaver-North Canadian River from the panhandle to Canton Lake in...

  4. Digital data sets that describe aquifer characteristics of the alluvial and terrace deposits along the Beaver-North Canadian River from the panhandle to Canton Lake in northwestern Oklahoma

    Data.gov (United States)

    U.S. Geological Survey, Department of the Interior — This data set consists of digital polygons of a constant recharge value for the alluvial and terrace deposits along the Beaver-North Canadian River from the...

  5. The effect of lithology on valley width, terrace distribution, and coarse sediment provenance in a tectonically stable catchment with flat-lying stratigraphy

    Science.gov (United States)

    Amanda Keen-Zebert,; Hudson, Mark R.; Stephanie L. Shepherd,; Evan A. Thaler,

    2017-01-01

    How rock resistance or erodibility affects fluvial landforms and processes is an outstanding question in geomorphology that has recently garnered attention owing to the recognition that the erosion rates of bedrock channels largely set the pace of landscape evolution. In this work, we evaluate valley width, terrace distribution, and sediment provenance in terms of reach scale variation in lithology in the study reach and discuss the implications for landscape evolution in a catchment with relatively flat2

  6. Landscape Change in Mediterranean Farmlands: Impacts of Land Abandonment on Cultivation Terraces in Portofino (Italy and Lesvos (Greece

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    Sluis Theo Van Der

    2014-01-01

    Full Text Available The Mediterranean landscape has been rapidly changing over the past decades. Many regions saw a population decline, which resulted in changing land use, abandonment of marginal lands and colonisation by shrubs and tree species. Typical features like farming terraces, olive yards, and upland grasslands have been decreasing over the past 50 years. This results in a declining biodiversity and loss of traditional Mediterranean landscapes. In this paper we assess the landscape changes that took place in two areas, in Portofino, on the Italian Riviera, and Lesvos, a Greek island near the Turkish coast. We compared land use maps and aerial photographs over the past decades to quantify the land use changes in these two areas. Additional information was acquired from farmers’ interviews and literature. We found that changes are related to societal changes in the appraisal of agricultural land uses, and to the urban expansion, tourism and recreation. These diffuse processes are a result of policy measures and autonomous societal transformations. This is confirmed by the results of two interview surveys: between 1999 and 2012 agricultural land use in Portofino regional Park and buffer zone further marginalised, and the associated landscape changes are perceived as a substantial loss of character and identity. This problem is emblematic for large parts of the Mediterranean. Comparing different landscapes reveal similar processes of landscape change, which can be related to similar driving forces. Based on such comparisons, we learn about possible trajectories of change, and ask for a comprehensive approach to land use management.

  7. Land Use Alters the Plant-Derived Carbon and Nitrogen Pools in Terraced Rice Paddies in a Mountain Village

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    Seiji Shimoda

    2017-10-01

    Full Text Available In Japan, terraced paddies in mountain villages are symbolic of the traditional landscape, but they are gradually being abandoned. To compare plant-derived C and N among land uses, we compared adjacent forest floor (FF, agricultural paddy (AP, and post-agricultural paddy (PP sites. Long-term litter accumulation could explain the significantly higher litter C and belowground biomass C in FF than in AP and PP. The low-density-fraction (LF soil C was significantly higher in FF than in PP and better reflected land use than the whole-soil C. The AP soil held more N than FF and PP at 20–30 cm, associated with higher LF soil N. Periodic tillage in AP maintains the LF soil N, but N supplied to the surface soil reduced with depth following abandonment. Differences in recycling of organic matter and nutrients among land uses are crucial to plant-derived C and N contents of soil.

  8. Elevation and Land Use Types Have Significant Impacts on Spatial Variability of Soil Organic Matter Content in Hani Terraced Field of Yuanyang County, China

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    LI Feng-bo

    2015-01-01

    Full Text Available Soil organic matter (SOM content is one of the most important indicators of the sustainability of soil. To maintain sustainable soil utilization and management in fragile Hani terraced field, it is meaningful to investigate the effects of topography and land use type on SOM content. Descriptive statistics and geostatistics were used to analyze the data and the kriging method was applied to map the spatial patterns of SOM content. The results showed that the mean SOM content was 32.76 g/kg, with a variation coefficient of 40%. The SOM content was affected by elevation and land use type. As the increase of elevation, the SOM content in Hani terraced field also increased obviously. The SOM content in tea garden, which is almost at high elevation, was the highest in all six land use types, and the SOM content decreased in a following sequence: tea garden > paddy field > corn field > banana garden > cassava field > sugarcane field. In addition, at the same elevation, the paddy field had the highest SOM content compared with other land use types. All these results demonstrate that paddy field is the most efficient and suitable land use type for SOM conservation at high, middle or low elevations in the fragile Hani terraced field. In order to protect soil quality and maintain the sustainable agricultural development, it is necessary to maintain or even to enlarge the area of paddy field in Yuanyang county, Yunnan Province, China.

  9. Resilience and adaptability of rice terrace social-ecological systems: a case study of a local community's perception in Banaue, Philippines

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    Adam C. Castonguay

    2016-06-01

    Full Text Available The social-ecological systems of rice terraces across Southeast Asia are the result of centuries of long-term interactions between human communities and their surrounding ecosystems. Processes and structures in these systems have evolved to provide a diversity of ecosystem services and benefits to human societies. However, as Southeast Asian countries experience rapid economic growth and related land-use changes, the remaining extensive rice cultivation systems are increasingly under pressure. We investigated the long-term development of ecosystem services and the adaptive capacity of the social-ecological system of rice terrace landscapes using a case study of Banaue (Ifugao Province, Northern-Luzon, Philippines. A set of indicators was used to describe and assess changes in the social-ecological state of the study system. The resilience of the rice terraces and the human communities that maintain them was examined by comparing the current state of the system with results from the literature. Our findings indicate that, although the social-ecological system has not yet shifted to an alternative state, pressures are increasing and some cultural ecosystem services have already been lost.

  10. Disentangling Values in the Interrelations between Cultural Ecosystem Services and Landscape Conservation—A Case Study of the Ifugao Rice Terraces in the Philippines

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    Bianca Tilliger

    2015-09-01

    Full Text Available In the past few years, there has been a growing amount of research on economic quantifications and valuations of ecosystem services (ES in agricultural systems. However, little attention has been given to cultural ESs (CES in general and their link to the landscape in particular. This paper tries to tackle this gap with a case study on the Ifugao Rice Terraces of the Philippines. The study aims to understand the interrelations between the different CESs and their relationships with the landscape. Besides contributing to knowledge about the degradation of the rice terraces, this study was conducted in order to discuss at a theoretical level how CESs and their relationship with the landscape must be addressed in ES management and policy decisions. The methodological approach includes a combination of semi-structured interviews (n = 60 and a perception survey (n = 66. The results reveal that CESs, apart from being interrelated, are also responsible for and affected by the degradation of the rice terraces, which is why they are important factors to consider in ecosystem conservation. This paper finally provides policy recommendations for the empirical case and demonstrates the importance of connecting CES analysis with landscape studies looking at agricultural systems.

  11. Correlations of cave levels, stream terraces and planation surfaces along the River Mur-Timing of landscape evolution along the eastern margin of the Alps.

    Science.gov (United States)

    Wagner, Thomas; Fritz, Harald; Stüwe, Kurt; Nestroy, Othmar; Rodnight, Helena; Hellstrom, John; Benischke, Ralf

    2011-11-01

    The transition zone of the Eastern Alps to the Pannonian Basin provides one of the best sources of information on landscape evolution of the Eastern Alpine mountain range. The region was non-glaciated during the entire Pleistocene. Thus, direct influence of glacial carving as a landscape forming process can be excluded and relics of landforms are preserved that date back to at least the Late Neogene. In this study, we provide a correlation between various planation surfaces across the orogen-basin transition. In particular, we use stream terraces, planation surfaces and cave levels that cover a vertical spread of some 700 m. Our correlation is used to show that both sides of the transition zone uplifted together starting at least about 5 Ma ago. For our correlation we use recently published terrestrial cosmogenic nuclide (TCN) burial ages from cave sediments, new optically stimulated luminescence (OSL) ages of a stream terrace and U-Th ages from speleothems. Minimum age constraints of cave levels from burial ages of cave sediments covering the last ~ 4 Ma are used to place age constraints on surface features by parallelizing cave levels with planation surfaces. The OSL results for the top section of the type locality of the Helfbrunn terrace suggest an Early Würm development (80.5 ± 3.7 to 68.7 ± 4.0 ka). The terrace origin as a penultimate gravel deposit (in classical Alpine terminology Riss) is therefore questioned. U-series speleothem ages from caves nearby indicate formation during Marine Isotope Stages (MIS) 5c and 5a which are both interstadial warm periods. As OSL ages from the terrace also show a time of deposition during MIS 5a ending at the MIS 5/4 transition, this supports the idea of temperate climatic conditions at the time of deposition. In general, tectonic activity is interpreted to be the main driving force for the formation and evolution of these landforms, whilst climate change is suggested to be of minor importance. Obvious hiatuses

  12. Isochron burial dating of the Haslau terrace of the Danube (Vienna Basin) and interlaboratory comparison of sample preparation in Vienna and Budapest

    Science.gov (United States)

    Ruszkiczay-Rüdiger, Zsófia; Neuhuber, Stephanie; Decker, Kurt; Braucher, Régis; Fiebig, Marcus; Braun, Mihály; Lachner, Johannes; Aster Team

    2017-04-01

    In the Vienna Basin, terraces to the South of the Danube form a staircase with altitudes ranging between 25 and 130 m above current water level. The terrace system has been strongly dissected by faults related to the sinistral movement of the Vienna Basin Transform Fault System [1, 2]. Although each fault block displays a slightly different succession of terraces, fault-related vertical displacements south of the Danube have not yet been quantified. To better understand the Quaternary terrace sequence and its displacement along a fault segment south of the Danube, the isochron burial dating method [3] based on the 26Al and 10Be cosmogenic nuclide pair has been used on a terrace at Haslau an der Donau (˜40 m above river level). This terrace is locally the lowest of a staircase of a total of 6 different levels. Based on geomorphological mapping, its age was considered to be Middle Pleistocene [4]. The sample set consisted of several quartzite cobbles taken from two sedimentary units (5.5 m and 11.8 m depth) separated by an erosional hiatus of unknown duration. Six cobbles were selected for inter-laboratory comparison and processed at both the Cosmogenic Nuclide Sample Preparation Laboratory at Vienna and at Budapest [5]. AMS measurements were performed at the French national facility ASTER (CEREGE, Aix-en-Provence) and at the Vienna Environmental Research Accelerator (VERA). Initially, the obtained results show that the 10Be and 26Al concentrations calculated from the subsamples processed independently using different extraction schemes at both laboratories overlap within error for all subsamples but one, whose 26Al concentrations were significantly different. The low 26Al concentration measured in one Budapest sample probably resulted from Al having been trapped within the insoluble residues observed after evaporation to dryness. A modification of the sample processing allows overcoming this difficulty while treating for the following sample set. The results

  13. ZONASI POTENSI PENCEMARAN AIR TANAH PADA TERAS SUNGAI CODE YOGYAKARTA (Zoning The Potential Groundwater Pollution at Code River Terrace, Yogyakarta

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    Frista Yorhanita

    2001-08-01

    Full Text Available ABSTRAK Tujuan penelitian ini ialah untuk membuktikan bahwa biomassa Fusarium sp dapat mereduksi Cr(VI, dan biomassa Aspergillus niger dapat digunakan untuk mengambil ion krom dari larutan. Fusarium.sp ditumbuhkan pada media cair kentang dekftosa cair, ditambah K2Cr2O7 atau sludge limbah penyamakan kulit. Selanjutnya diamati perubahan warnanya, bila terjadi perubahan warna dan oranye ke ungu atau tak berwarna maka telah terjadi reduksi krom valensi VI menjadi krom valensi Ill. Aspergillus niger ditumbuhkan pada media Potato dectrose agar (PDA padat, dipindahkan ke media cair yang bensi bakto pepton, bakto dektrose dan srukronutrien. Produksi biomassa dilakukan pada labu erlenmeyer; setelah 5 hari dipanen dan dibuat bubuk. Bubuk ini digunakan untuk mengambil krom dari larutan. Hasil penelitian menunjukkan bahwa biomassa Fusarium sp dapat digunakan untuk mengambil krom dan larutan yang.mengandung KrCrrO, atau sludge limbah penyamakan kulit. Waktu inkubasi yang lebih lama meningkatkan absorbsi krom oleh biomassa Fascrium sp. Fusarium sp mampu mereduksi Cr(VI menjadi Cr(Iii. Biomassa Aspergillus niger dapat digunakan untuk mengambil krom dari larutan. Hasil terbaik diperoleh pada konsentrasi awal 100 mg/I, pada pH 2,0, berat biomassa 0,1 g, dan waktu kontak 12 jam, yaitu 96,23% untuk Cr(II| dan96,3 % untuk Cr(VI. Fusarium sp. dan A. niger dapat digunakan sebagai bioremediator dalam penanganan limbah penyamakan kulit secara biologi.   ABSTRACT The study area of this research was parts of the code river terraces, Yogyakarta. The aims of this research were as follows: (1 to determine the part of the code river terrace which has potential groundwater pollution; (2 to assess the natural physical factors (aquifer materials, depth of groundwater table, and the groundwater flow distance and the non-natural physical factors of environmental sanitation (houses density, population density, horizontal distance between pollution source and well, and the number

  14. Geological characterization of agricultural terraces as a tool for the territorial safeguard and for the valorization of "Terroir"

    Science.gov (United States)

    Brancucci, Gerardo; Brancucci, Michele; Marescotti, Pietro; Poggi, Eugenio; Solimano, Monica; Vegnuti, Roberto; Giostrella, Paola; Tarolli, Paolo

    2017-04-01

    The progressive abandonment of the terraced areas of Liguria (NW Italy) is determining an inexorable land degradation, which causes, among other things, the erosive processes and the slope failure. Several studies highlighted the need of strategies for the recovery of abandoned agricultural lands by encouraging the productive reuse. Nevertheless, it is well known that agricultural activities in rural areas with steep slopes are strongly penalized by the high production costs determined by the adverse geomorphological conditions. For these reasons, one of the possible solutions is to encourage the production of high-quality agricultural crops, and to promote the uniqueness of the products. The uniqueness of the local products can be promoted not only by means of marketing strategy, mostly based on historical and traditional aspects of the productions, but also by correlating the product with the geological features (e.g., lithology, mineralogy and geochemistry) of the agricultural soils and parental rocks. These features are typically peculiar of a geographic area and thus strictly correlated with the site of production. This approach, together with the biological characterization of the crop, can link the cultivar to the geographical area of production thus evidencing peculiarities that are inimitable elsewhere. With this work we present the experimental results of investigations performed on several types of agricultural products (grapes and wines, olives and olive oils, apples) as well as on wild mushroom of the Boletus family. The analyses have been carried out either in laboratory and by means of field portable instruments (FP-EDXRF and FP-FTIR) which permitted a large number of in situ analyses, in a cost efficient and timely manner, thus allowing the realization of high spatial resolution compositional maps. This analytical approach also resulted particularly effective to improve the information obtained by traditional pedological and agronomical

  15. Evaluation of Integration Degree of the ASG-EUPOS Polish Reference Networks With Ukrainian GeoTerrace Network Stations in the Border Area

    Science.gov (United States)

    Siejka, Zbigniew

    2017-09-01

    GNSS systems are currently the basic tools for determination of the highest precision station coordinates (e.g. basic control network stations or stations used in the networks for geodynamic studies) as well as for land, maritime and air navigation. All of these tasks are carried out using active, large scale, satellite geodetic networks which are complex, intelligent teleinformatic systems offering post processing services along with corrections delivered in real-time for kinematic measurements. Many countries in the world, also in Europe, have built their own multifunctional networks and enhance them with their own GNSS augmentation systems. Nowadays however, in the era of international integration, there is a necessity to consider collective actions in order to build a unified system, covering e.g. the whole Europe or at least some of its regions. Such actions have already been undertaken in many regions of the world. In Europe such an example is the development for EUPOS which consists of active national networks built in central eastern European countries. So far experience and research show, that the critical areas for connecting these networks are border areas, in which the positioning accuracy decreases (Krzeszowski and Bosy, 2011). This study attempts to evaluate the border area compatibility of Polish ASG-EUPOS (European Position Determination System) reference stations and Ukrainian GeoTerrace system reference stations in the context of their future incorporation into the EUPOS. The two networks analyzed in work feature similar hardware parameters. In the ASG-EUPOS reference stations network, during the analyzed period, 2 stations (WLDW and CHEL) used only one system (GPS), while, in the GeoTerrace network, all the stations were equipped with both GPS and GLONASS receivers. The ASG EUPOS reference station network (95.6%) has its average completeness greater by about 6% when compared to the GeoTerrace network (89.8%).

  16. Geomorphic evidence for Quaternary tectonics on the southern flank of the Yellowstone hotspots from terraces and stream profiles along the Hoback and Snake River

    Science.gov (United States)

    Bufe, Aaron; Pederson, Joel; Tuzlak, Daphnee

    2017-04-01

    The greater Yellowstone region offers a type example of Earth surface response to a mantle anomaly. Motion of the North American plate across the Yellowstone plume over the past 17 Ma is predicted to have produced a wave of transient uplift and extension of the upper crust. In the wake of the plume, the Snake River Plain (SRP) has been subsiding 4-8 km due to a combination of crustal loading by basaltic magmatism and cooling. Studying patterns and rates of Quaternary incision of rivers flowing off the Yellowstone plateau can test models about the distribution and timing of active uplift, subsidence, and faulting, improving our understanding of the geodynamics and the hazards in the region. We present results from surveying and optically stimulated luminescence (OSL) dating of river terraces along the Hoback and upper Snake rivers (western Wyoming and southeastern Idaho), which provide a study transect from the modern Yellowstone hotspot center, across zones of changing fault activity, into the subsiding SRP. Downstream of Palisades Reservoir, dated fill terraces reveal that the Snake River has seen no apparent net incision since 50-60 ky. Moreover, a paleo-channel bed preserved by a 2 My-old basalt flow and exposed <10 m above the modern river suggests that net incision rates averaged over 2 My were <5 m/My. In contrast, upstream of Alpine, we find that three levels of 10-90 ky-old strath terraces record recent incision at rates of 0.1-0.3 mm/y along the deeply incised Alpine Canyon and the Hoback River. Here, the pattern of incision rates appear to be controlled by local baselevel fall along normal faults and we hypothesize that rates of subsidence of the SRP in the Quaternary have been relatively slow (< 0.1 mm/y).

  17. Chemical weathering of a marine terrace chronosequence, Santa Cruz, California I: Interpreting rates and controls based on soil concentration-depth profiles

    Science.gov (United States)

    White, A.F.; Schulz, M.S.; Vivit, D.V.; Blum, A.E.; Stonestrom, D.A.; Anderson, S.P.

    2008-01-01

    The spatial and temporal changes in element and mineral concentrations in regolith profiles in a chronosequence developed on marine terraces along coastal California are interpreted in terms of chemical weathering rates and processes. In regoliths up to 15 m deep and 226 kyrs old, quartz-normalized mass transfer coefficients indicate non-stoichiometric preferential release of Sr > Ca > Na from plagioclase along with lesser amounts of K, Rb and Ba derived from K-feldspar. Smectite weathering results in the loss of Mg and concurrent incorporation of Al and Fe into secondary kaolinite and Fe-oxides in shallow argillic horizons. Elemental losses from weathering of the Santa Cruz terraces fall within the range of those for other marine terraces along the Pacific Coast of North America. Residual amounts of plagioclase and K-feldspar decrease with terrace depth and increasing age. The gradient of the weathering profile bs is defined by the ratio of the weathering rate, R to the velocity at which the profile penetrates into the protolith. A spreadsheet calculator further refines profile geometries, demonstrating that the non-linear regions at low residual feldspar concentrations at shallow depth are dominated by exponential changes in mineral surface-to-volume ratios and at high residual feldspar concentrations, at greater depth, by the approach to thermodynamic saturation. These parameters are of secondary importance to the fluid flux qh, which in thermodynamically saturated pore water, controls the weathering velocity and mineral losses from the profiles. Long-term fluid fluxes required to reproduce the feldspar weathering profiles are in agreement with contemporary values based on solute Cl balances (qh = 0.025-0.17 m yr-1). During saturation-controlled and solute-limited weathering, the greater loss of plagioclase relative to K-feldspar is dependent on the large difference in their respective solubilities instead of the small difference between their respective

  18. Records of human occupation from Pleistocene river terrace and aeolian sediments in the Arneiro depression (Lower Tejo River, central eastern Portugal)

    DEFF Research Database (Denmark)

    Cunha, Pedro P.; Almeida, Nelson A.C.; Aubry, Thierry

    2012-01-01

    in a geomorphological, sedimentary and chronological framework, contribute new information on the understanding of human occupation in western Iberia during cold-climate episodes of the last 62 to 12 ka; and especially during the cooler and driest conditions that occurred between 32 and 12 ka, when the climate favoured...... aeolian sediment transport. In the Lower Tejo River, the integration of absolute age datasets with archaeological, geomorphological and sedimentary data indicate that in westernmost Iberia the first appearance of artefacts in river terrace sediments suggests that the earliest marker for human occupation...

  19. How to analyse the typological features of stone terrace walls. A methodology applied to the rural landscape of the Tuscan Region (Central Italy)

    Science.gov (United States)

    Agnoletti, Mauro; Conti, Leonardo; Frezza, Lorenza; Santoro, Antonio

    2015-04-01

    Terraced systems currently represent an indubitable added value for Tuscany, as for other regions. This value goes beyond their original function of hosting new areas for cultivation. Indeed, the hydrological functions performed by such systems within the historic and modern agricultural matrix, including control of erosion, stabilisation of the slopes, prolongation of run-off times and the possible reduction of the volumes of surface runoff, are well-known. In addition they also play a strategic role in the conservation of biodiversity and in maintaining local identity value. These systems are evidence of the laborious knowledge built up by many generations of farmers in making the most of the territorial resources in terms of quality production through agronomic operations for the management of the crops. Within the framework of policies for the conservation and valorisation of the rural landscape, this recognised economic, environmental and historic-cultural value has engendered a growing awareness and sensitivity towards the safeguarding of such structural characteristics. Indeed, at national level the terraced agricultural systems come within the scope of actions scheduled in the National Strategic Plan for Rural Development 2007-2013, and the Cross-Compliance Decree envisages that they be maintained through the granting of economic aid as laid down in the Regional Development Plans, to be pursued through appropriate agronomic and environmental conditions in adherence to the obligatory management criteria for the protection of the soil. 18 sample areas, previously selected on the basis of the terracing intensity index (> 400 m/ha), were subjected to on-site surveys to determine the geo-typological features through the identification and measurement of the main technical-construction parameters of the dry stone walls. In view of the complexity of carrying out a census of the entire regional territory, it was essential to restrict the analysis to a limited

  20. Simulation of the fate of Boscalid and its transformation product 4-Chlorobenzoic acid in a vineyard-terraces catchment

    Science.gov (United States)

    Vollert, Dieter; Gassmann, Matthias; Olsson, Oliver; Kümmerer, Klaus

    2017-04-01

    In the viniculture fungicides are commonly applied foliar on the plant surface, resulting in high concentrations in runoff water. The fungicide Boscalid occurred frequently and in high concentrations in runoff water in the Loechernbach catchment, a 180 ha vineyard catchment in south-west Germany, during rainfall-runoff events in 2016. The catchment is characterized by a typical terraces structure and the connection of a dense road network. The washing off from drift-depositions on the streets is expected to be a major pathway for pesticides. The main objective of this study was the provision of a catchment model to simulate the transport and transformation processes of Boscalid. Based on this model, source areas of Boscalid residue pollution and its export pathways will be identified and provide urgently needed information for the development of water pollution control strategies. The distributed, process-based, reactive transport catchment model ZIN-AgriTra was used for the evaluation of the pesticide mobilization and the export processes. The hydrological model was successfully calibrated for a 6-month high-resolution time series of discharge data. Pesticide modelling was calibrated for single rainfall events after Boscalid application. Additionally, the transformation product 4-Chlorobenzoic acid has been simulated using literature substance parameters, in order to gain information about anticipated environmental concentrations. The pathways for the discharge of Boscalid were characterized and the streets were confirmed as major pathway for the pesticide discharge in the catchment. The main Boscalid loss occured during the first flush after a storm event containing concentrations up to 10 µg/l. The results show that storage on surfaces without sorption contributes significantly to the export of pesticides through the first flush. Therefore, the mobilization process affects a combination of both sorptive (e.g. at the soil) and non-sorptive (e.g. on the surface

  1. A Possible Source Mechanism of the 1946 Unimak Alaska Far-Field Tsunami: Uplift of the Mid-Slope Terrace Above a Splay Fault Zone

    Science.gov (United States)

    von Huene, Roland; Miller, John J.; Klaeschen, Dirk; Dartnell, Peter

    2016-12-01

    In 1946, megathrust seismicity along the Unimak segment of the Alaska subduction zone generated the largest ever recorded Alaska/Aleutian tsunami. The tsunami severely damaged Pacific islands and coastal areas from Alaska to Antarctica. It is the charter member of "tsunami" earthquakes that produce outsized far-field tsunamis for the recorded magnitude. Its source mechanisms were unconstrained by observations because geophysical data for the Unimak segment were sparse and of low resolution. Reprocessing of legacy geophysical data reveals a deep water, high-angle reverse or splay thrust fault zone that leads megathrust slip upward to the mid-slope terrace seafloor rather than along the plate boundary toward the trench axis. Splay fault uplift elevates the outer mid-slope terrace and its inner area subsides. Multibeam bathymetry along the splay fault zone shows recent but undated seafloor disruption. The structural configuration of the nearby Semidi segment is similar to that of the Unimak segment, portending generation of a future large tsunami directed toward the US West coast.

  2. A possible source mechanism of the 1946 Unimak Alaska far-field tsunami, uplift of the mid-slope terrace above a splay fault zone

    Science.gov (United States)

    von Huene, Roland E.; Miller, John J.; Klaeschen, Dirk; Dartnell, Peter

    2016-01-01

    In 1946, megathrust seismicity along the Unimak segment of the Alaska subduction zone generated the largest ever recorded Alaska/Aleutian tsunami. The tsunami severely damaged Pacific islands and coastal areas from Alaska to Antarctica. It is the charter member of “tsunami” earthquakes that produce outsized far-field tsunamis for the recorded magnitude. Its source mechanisms were unconstrained by observations because geophysical data for the Unimak segment were sparse and of low resolution. Reprocessing of legacy geophysical data reveals a deep water, high-angle reverse or splay thrust fault zone that leads megathrust slip upward to the mid-slope terrace seafloor rather than along the plate boundary toward the trench axis. Splay fault uplift elevates the outer mid-slope terrace and its inner area subsides. Multibeam bathymetry along the splay fault zone shows recent but undated seafloor disruption. The structural configuration of the nearby Semidi segment is similar to that of the Unimak segment, portending generation of a future large tsunami directed toward the US West coast.

  3. N Doping to ZnO Nanorods for Photoelectrochemical Water Splitting under Visible Light: Engineered Impurity Distribution and Terraced Band Structure

    Science.gov (United States)

    Wang, Meng; Ren, Feng; Zhou, Jigang; Cai, Guangxu; Cai, Li; Hu, Yongfeng; Wang, Dongniu; Liu, Yichao; Guo, Liejin; Shen, Shaohua

    2015-01-01

    Solution-based ZnO nanorod arrays (NRAs) were modified with controlled N doping by an advanced ion implantation method, and were subsequently utilized as photoanodes for photoelectrochemical (PEC) water splitting under visible light irradiation. A gradient distribution of N dopants along the vertical direction of ZnO nanorods was realized. N doped ZnO NRAs displayed a markedly enhanced visible-light-driven PEC photocurrent density of ~160 μA/cm2 at 1.1 V vs. saturated calomel electrode (SCE), which was about 2 orders of magnitude higher than pristine ZnO NRAs. The gradiently distributed N dopants not only extended the optical absorption edges to visible light region, but also introduced terraced band structure. As a consequence, N gradient-doped ZnO NRAs can not only utilize the visible light irradiation but also efficiently drive photo-induced electron and hole transfer via the terraced band structure. The superior potential of ion implantation technique for creating gradient dopants distribution in host semiconductors will provide novel insights into doped photoelectrode materials for solar water splitting. PMID:26262752

  4. A multiple dating approach (luminescence and electron spin resonance) to assess rates of crustal deformation using Quaternary fluvial terraces of the lower Moulouya River (NE Morocco)

    Science.gov (United States)

    Bartz, Melanie; Rixhon, Gilles; Duval, Mathieu; King, Georgina; Brückner, Helmut

    2017-04-01

    The Moulouya River, the largest catchment in Morocco, drains an area characterized by active crustal deformation during the Late Cenozoic due to the convergence between the African and Eurasian plates. Our study focuses on the lowermost reach of the river in NE Morocco, where a thrust zone associated with N-S compressive shortening in this region was identified (Barcos et al., 2014; Rixhon et al., 2017). New geomorphological results demonstrate contrasting fluvial environments on each side of the thrust: long-lasting fluvial aggradation, materialized by >37 m-thick stacked fill terraces, and the development of a well-preserved terrace staircase, with three Pleistocene terrace levels, occurred in the footwall and the hanging wall, respectively (Rixhon et al., 2017). Here, we present a preliminary geochronological background for these contrasting terrace systems based on a multiple dating approach. Samples for (i) luminescence (pIRIR225 and pIRIR290 dating of coarse-grained K-feldspars) and (ii) electron spin resonance (ESR dating of coarse-grained quartz) from four different profiles were collected. (i) Due to the application of the athermal detrapping model by Huntley (2006) (modified after Kars et al., 2008), it appears that the feldspar signals are in sample specific field saturation. Our results yielded minimum ages of 0.9 Ma and 0.7 Ma for the footwall and hanging wall, respectively. (ii) Using the multiple centre approach with ESR dating (Duval et al., 2015), we measured both the aluminium (Al) and the titanium (Ti) centres in order to evaluate whether they would provide consistent results. Results indicate that De values of the Al centre are either slightly higher compared to those of the Ti centre or they agree within a 1σ-error range, which may simply be due to the slower bleaching kinetics of the Al centre. Thus, the ESR ages were inferred from the Ti centre. Ages between 1.35±0.10 and 1.17±0.10 Ma in the footwall show sediment aggradation between MIS

  5. New data on the chronology of the Vale do Forno sedimentary sequence (Lower Tejo River terrace staircase) and its relevance as a fluvial archive of the Middle Pleistocene in western Iberia

    Science.gov (United States)

    Cunha, Pedro P.; Martins, António A.; Buylaert, Jan-Pieter; Murray, Andrew S.; Raposo, Luis; Mozzi, Paolo; Stokes, Martin

    2017-06-01

    The Vale do Forno archaeological sites (Alpiarça, central Portugal) document the earliest human occupation in the Lower Tejo River, well established in geomorphological and environmental terms, within the Middle Pleistocene. In a staircase of six fluvial terraces, the Palaeolithic sites were found on the T4 terrace (+24 m, above river bed) which is made of a basal Lower Gravels unit (LG) and an overlying Upper Sands unit (US). Geomorphological mapping, coupled with lithostratigraphy, sedimentology and luminescence dating (quartz-OSL and K-feldspar post-IRIR290) were used in this study. The oldest artefacts found in the LG unit show crude bifacial forms that can be attributed to the Acheulian. In contrast, the US unit has archaeological sites stratigraphically documenting successive phases of an evolved Acheulian. Luminescence dating and correlation with the Marine Isotopic Stages suggest that the LG unit has a probable age of ca. 335 to 325 ka and the US unit an age of ca. 325 to 155 ka. This is in contrast to previous interpretations ascribing this terrace (and lithic industries) to the Last Interglacial and early phases of the Last Glacial. The VF3 site (Milharós), containing Micoquian (Final Acheulian) industries (with fine and elaborated bifaces), found in a stratigraphic level located between the T4 terrace deposits and a colluvium associated with Late Pleistocene aeolian sands, is younger than 155 ka but much older than 32 ka.

  6. New data on the chronology of the Vale do Forno sedimentary sequence (Lower Tejo River terrace staircase) and its relevance as a fluvial archive of the Middle Pleistocene in western Iberia

    DEFF Research Database (Denmark)

    Cunha, Pedro; Martins, Antonio; Buylaert, Jan-Pieter

    2017-01-01

    The Vale do Forno archaeological sites (Alpiarça, central Portugal) document the earliest human occupation in the Lower Tejo River, well established in geomorphological and environmental terms, within the Middle Pleistocene. In a staircase of six fluvial terraces, the Palaeolithic sites were foun...

  7. Forest gardening on abandoned terraces links local biomass carbon accumulation to international carbon markets, reverses land degradation, improves food diversity, and increases farmer income

    Science.gov (United States)

    Schmidt, Hans-Peter; Pandit, Bishnu Hari; Kammann, Claudia

    2017-04-01

    Despite chronic underproduction of food in Nepal, more and more agricultural land is abandoned especially in the remote middle hills and mountains. Male and young workers leave the villages for higher wages in the bigger cities or abroad. By now, most villages are mainly populated by women, children and elderly persons maintaining the gardens and fields close to the houses and leave the centenarian terraces fallow. Erosion, vanishing water resources, losses of soil organic carbon and the weakening of the local agro-economy become increasingly problematic. During the rainy season of 2015/16, 86 farmer families from four villages replanted their abandoned terraces with 25,000 mixed trees, mostly Cinnamon, Moringa, Mulberry, Lemon, Michelia, Paulownia, and various nuts. All trees were planted with a blend of organic biochar-based fertilizer and compost, since it was convincingly demonstrated by more than 20 field trials in this region that this was the most plant-growth promoting method. Mulching of the trees with rice straw or thatch grass was generalized. To let the young tries pass the critical seven months of dry season, water retention ponds with pipe irrigation were installed. Farmers were organized in groups of three families to mutually help and control the tree maintenance which led to an average tree survival rate of more than 80% after the first year compared to less than 50% in many country-wide forestation projects since the 1980s. Between the lower and upper lines of trees on the terraces, ginger, turmeric, black beans, onions, lentils and other secondary crops were cultivated using the same organic biochar based fertilizer and mulching techniques. What may seem a reasonable approach for many places, is in many of the poorest countries simply not possible to realize because village families do often not have the necessary initial investment for saplings and irrigation facilities at their disposal. Therefore, the Ithaka Institute linked the forest garden

  8. The late-glacial fluvial terrace t7 at Raunheim (lower River Main), Germany. Constraining the chronological placement by optical stimulated luminescence dating.

    Science.gov (United States)

    Thiemeyer, Heinrich; Kadereit, Annette; Zipf, Lars; Flettner, Stephan

    2017-04-01

    The lower River Main valley exhibits up to seven fluvial terrace levels (t1 - t7, according to the stratigraphy of Semmel 1969). The lowermost terrace (t7) represents the most recently formed level which due to stratigraphical considerations is assumed to be of Late Pleistocene age (Semmel 1969). However, the chronological placement of the terrace has not been determined by numerical dating so far. The area was apparently roamed by Late Palaeolithic people as evidenced by artefacts which were discovered on a former sandy river bank between 87 m and 91 m above sea level on top of the t7 east of the town of Raunheim. We took this opportunity to open four trenches in order to localize additional in situ Palaeolithic artefacts and to investigate the stratigraphy of the sediments and soils and, for the first time, to provide numerical ages in order to narrow down the period of the t7 activity. Eight samples from three profiles in three of the trenches were collected for optical stimulated (OSL) dating. OSL dating occurred applying a blue light stimulated luminescence (BLSL) single aliquot regeneration (SAR) protocol (Murray & Wintle 2000) to small aliquots (few 102 grains) of quartz coarse grain separates (125 - 212 µm). The trenches showed that the t7 sediments consist of fluvial sand over gravel. They are overlain by calcareous loamy and sandy overbank deposits. At the investigated site the Holocene Cambisol at the surface passes into a Gleysol that has developed in a palaeochannel which is incised into the t7. The trenches revealed further that only parts of the Late Palaeolithic site are in situ and therefore contemporaneous with the fluvial sediments beneath the Cambisol. The upper part of the sections consists of colluvial deposits lying on truncated Cambisols. The OSL dating places the section into the period spanning the last glacial maximum (LGM) / late glacial to the late Holocene. The oldest investigated fluvial t7 sediments date around 24.7 ka. Slightly

  9. Preliminary Data about Vertical Deformation of the eastern part of the Anatolian Scholle: Insight from Pülümür River Terraces

    Science.gov (United States)

    Sançar, Taylan; Sunal, Gürsel; Korhan Erturaç, M.

    2017-04-01

    The northward motion of the African and Arabian plates relative to Eurasia and westward motion of the Anatolian scholle (An) have a key role in understanding of the eastern Mediterranean tectonics setting. The North and East Anatolian Shear Zones (NASZ and EASZ) present the main deformation zones of westward extrusion of the Anatolia whereas the NW-striking dextral and the NE-striking sinistral faults represent the remarkable intra-plate deformation within the An. In contrast to the earlier hypothesis, recent geologic and geodetic studies and micro seismic activity strongly suggests that internal deformation of the An is a continuous process. Some of these strike-slip faults, such as Tuzgölü Fault, Ecemiş Fault and Malatya-Ovacık Fault Zone (MOFZ), have long been documented in terms of the kinematic evolution, slip-rate and paleoseismic activity but there is no or very limited knowledge on the uplift characteristics of the An. In this study, we focused on more complex region of the An, which is delimited by the NASZ at north, the EASZ at southeast, the MOFZ at west and the Nazmiye Fault Zone (NFZ) at south. We present data on the distribution of geologic and morphologic structures by using satellite images, aerial stereo pairs, digital elevation models (DEM) with 10 m ground pixel resolution and extensive field observations in this region, particularly along the NFZ that has two sub-parallel segments. The horizontal deformation along the NFZ, within the eastern part of the An, represented by 20 m to 10 km horizontal displacements.The spatial distribution of terraces of the Pülümür River that is one of the biggest drainage systems of the region is a clear morphologic indicator of the vertical deformation of the eastern An. The Pülümür River incised into Paleozoic metamorphic basement at the north and Eocene volcanoclastic at the south. We mapped three terrace levels (T1-T3) in the V-shaped Pülümür River valley that has about 5 km offset along the both

  10. Effect of Rhizobium sp. BARIRGm901 inoculation on nodulation, nitrogen fixation and yield of soybean (Glycine max) genotypes in gray terrace soil.

    Science.gov (United States)

    Alam, Faridul; Bhuiyan, M A H; Alam, Sadia Sabrina; Waghmode, Tatoba R; Kim, Pil Joo; Lee, Yong Bok

    2015-01-01

    Soybean plants require high amounts of nitrogen, which are mainly obtained from biological nitrogen fixation. A field experiment was conducted by soybean (Glycine max) genotypes, growing two varieties (Shohag and BARI Soybean6) and two advanced lines (MTD10 and BGM02026) of soybean with or without Rhizobium sp. BARIRGm901 inoculation. Soybean plants of all genotypes inoculated with Rhizobium sp. BARIRGm901 produced greater nodule numbers, nodule weight, shoot and root biomass, and plant height than non-inoculated plants. Similarly, inoculated plants showed enhanced activity of nitrogenase (NA) enzyme, contributing to higher nitrogen fixation and assimilation, compared to non-inoculated soybean plants in both years. Plants inoculated with Rhizobium sp. BARIRGm901 also showed higher pod, stover, and seed yield than non-inoculated plants. Therefore, Rhizobium sp. BARIRGm901 established an effective symbiotic relationship with a range of soybean genotypes and thus increased the nodulation, growth, and yield of soybean grown in gray terrace soils in Bangladesh.

  11. Chemical weathering of a marine terrace chronosequence, Santa Cruz, California. Part II: Solute profiles, gradients and the comparisons of contemporary and long-term weathering rates

    Science.gov (United States)

    White, A.F.; Schulz, M.S.; Stonestrom, David A.; Vivit, D.V.; Fitzpatrick, J.; Bullen, T.D.; Maher, K.; Blum, A.E.

    2009-01-01

    The spatial and temporal changes in hydrology and pore water elemental and 87Sr/86Sr compositions are used to determine contemporary weathering rates in a 65- to 226-kyr-old soil chronosequence formed from granitic sediments deposited on marine terraces along coastal California. Soil moisture, tension and saturation exhibit large seasonal variations in shallow soils in response to a Mediterranean climate. These climate effects are dampened in underlying argillic horizons that progressively developed in older soils, and reached steady-state conditions in unsaturated horizons extending to depths in excess of 15 m. Hydraulic fluxes (qh), based on Cl mass balances, vary from 0.06 to 0.22 m yr-1, resulting in fluid residence times in the terraces of 10-24 yrs. As expected for a coastal environment, the order of cation abundances in soil pore waters is comparable to sea water, i.e., Na > Mg > Ca > K > Sr, while the anion sequence Cl > NO3 > HCO3 > SO4 reflects modifying effects of nutrient cycling in the grassland vegetation. Net Cl-corrected solute Na, K and Si increase with depth, denoting inputs from feldspar weathering. Solute 87Sr/86Sr ratios exhibit progressive mixing of sea water-dominated precipitation with inputs from less radiogenic plagioclase. While net Sr and Ca concentrations are anomalously high in shallow soils due to biological cycling, they decline with depth to low and/or negative net concentrations. Ca/Mg, Sr/Mg and 87Sr/86Sr solute and exchange ratios are similar in all the terraces, denoting active exchange equilibration with selectivities close to unity for both detrital smectite and secondary kaolinite. Large differences in the magnitudes of the pore waters and exchange reservoirs result in short-term buffering of the solute Ca, Sr, and Mg. Such buffering over geologic time scales can not be sustained due to declining inputs from residual plagioclase and smectite, implying periodic resetting of the exchange reservoir such as by past vegetational

  12. The effect of digging activity of little souslik on soils of the first terrace of Khaki Sor in the Botkul'sk-Khaki depression

    Science.gov (United States)

    Shabanova, N. P.; Lebedeva Verba, M. P.; Bykov, A. V.

    2014-03-01

    The effect of digging activity of little souslik ( Spermophilus pygmaeus Pall.) on the microtopography and soils was studied in the areas with shallow saline groundwater developing under continental conditions for 10.5-12.7 ka. The portion of microtopographic features related to the digging activity was quantified. It was found that the micromounds formed by sousliks appear on recently dried surfaces with shallow saline groundwater. However, their portion in this case is less than 3% because of the poor vegetation and shallow groundwater. Then, with the lowering of the base of erosion and aging of the territory, the zoogenic effect becomes more pronounced. On the first terrace of Khaki Sor (salt lake), the digging activity of sousliks creates the initial heterogeneity of soils and vegetation. The soil cover is composed of the virgin quasigleyed solonchakous solonetzes under the Atriplex-Artemisia santonica association (Gypsic Salic Solonetz (Albic, Ruptic, Oxiaquic, Siltic)) and of the zooturbated solonetzes under the Artemisia santonica-A. lerchiana association (Endosalic Hypogypsic Gypsisol (Sodic, Siltic, Novic)). A comparative analysis of morphology and some chemical properties of virgin and zooturbated soils is given. The soils of souslik-made mounds are strongly mixed, and the structure of their horizons is completely disturbed. They are characterized by an increased total content of salts mainly due to gypsum accumulation. At the same time, the content of toxic salts in the soil profile remains rather high because of their ascending migration from the strongly saline groundwater. On the first terrace, the process of zoogenic amelioration of solonetzes by sousliks is limited and does not affect deep soil layers.

  13. Storm-related sedimentation influenced by coastal configuration in the stratigraphic record of a tectonically active shelf (Upper Pleistocene Le Castella terrace, Italy)

    Science.gov (United States)

    Nalin, Ronald; Massari, Francesco

    2018-03-01

    Analysis of patterns of coastal circulation and sediment dispersal is an essential step for the study of controlling factors influencing the long-term dynamics of coastal systems. Modern settings offer the possibility to monitor relevant parameters over relatively short time spans. However, geological examples complement this perspective by providing a time-averaged record where longer trends and stratigraphically significant processes can be evaluated. This study investigates the shallow marine deposits of Le Castella terrace (Upper Pleistocene, southern Italy) to document how patterns of circulation influenced by coastline configuration can affect the preserved millennial-scale depositional record of a progradational shoreline system. The regressive portion of the Le Castella terrace deposits, developed during a relative sea-level highstand and falling stage, consists of a progradational wedge mainly composed of redistributed skeletal particles of a coeval shallow water carbonate factory. Preservation of the morphology of the paleocoastline and abundant current-related sedimentary structures allow reconstruction of the predominant sediment dispersal dynamics responsible for the formation of this sedimentary wedge. Facies and paleocurrent analysis indicate offshore and alongshore sediment transport modes, consistent with coastal circulation driven by storms normally incident to the shoreline and a sharp change in coastline orientation. This coastal inflection influenced circulation patterns causing flow separation and eddy formation in the lee of the curved coastline. Syndepositional tectonic deformation also affected the architecture of the preserved deposits, controlling the nucleation and development of a clinostratified body and determining localized lateral stratigraphic variability. This study illustrates how transient but recurrent circulation patterns associated with changes in coastal orientation and related to high-energy storm events can leave a

  14. 10Be dating of the Main Terrace level in the Amblève valley (Ardennes, Belgium): new age constraint on the archaeological and palaeontological filling of the Belle-Roche palaeokarst

    Science.gov (United States)

    Rixhon, Gilles; Bourlès, Didier L.; Braucher, Régis; Siame, Lionel; Cordy, Jean-Marie; Demoulin, Alain

    2014-05-01

    It is still disputed whether very old archaeological and palaeontological remains found in the Belle-Roche palaeocave (eastern Belgium) pertain to the Early (˜1 Ma) or Middle (˜0.5 Ma) Pleistocene. Here, in situ-produced cosmogenic 10Be concentrations from a depth profile in nearby sediments of the Belle-Roche terrace (Amblève Main Terrace level) are used as an indirect solution of this chronological issue. The distribution of 10Be concentrations in the upper 3 m of this profile displays the theoretically expected exponential decrease with depth. Assuming a single exposure episode, we obtain a best fit age of 222.5±31 ka for the time of terrace abandonment. However, below 3 m, the 10Be concentrations show a marked progressive increase with depth. This distinctive cosmogenic signal is interpreted as the result of slow aggradation of the fluvial deposits over a lengthy interval. Modelling of the whole profile thus suggests that the onset of the terrace formation occurred at around 550 ka, with a sediment accumulation rate of ˜20 mm/ka. Based on two slightly different reconstructions of the geomorphic evolution of the area and a discussion of the temporal link between the cave and Main Terrace levels, we conclude that the fossil-bearing layers in the palaeokarst pertain most probably to MIS 14-13 (or possibly MIS 12-11) and the artifact-bearing layer to MIS 13 (or possibly MIS 11). This age estimate for the large mammal association identified in the Belle-Roche palaeokarst and the attribution to MIS 14-13 of a similar fauna found in the lowermost fossiliferous layers of the Caune de l'Arago (Tautavel) are in mutual support. Our results therefore confirm the status of the Belle-Roche site as a reference site for the Cromerian mammal association and the Early Palaeolithic industry in NW Europe.

  15. Coastal uplift west of Algiers (Algeria): pre- and post-Messinian sequences of marine terraces and rasas and their associated drainage pattern

    Science.gov (United States)

    Authemayou, Christine; Pedoja, Kevin; Heddar, Aicha; Molliex, Stéphane; Boudiaf, Azzedine; Ghaleb, Bassam; Van Vliet Lanoe, Brigitte; Delcaillau, Bernard; Djellit, Hamou; Yelles, Karim; Nexer, Maelle

    2017-01-01

    The North Africa passive margin is affected by the ongoing convergence between the African and Eurasian plates. This convergence is responsible for coastal uplift, folding, and reverse faulting on new and reactivated faults on the margin. The active deformation is diffuse and thus rather difficult to locate precisely. We aim to determine how a coastal landscape evolve in this geodynamic setting and gain insights into active tectonics. More particularly, we evidence and quantify coastal uplift pattern of the Chenoua, Sahel, and Algiers reliefs (Algeria), using sequences of marine terraces and rasas and computing several morphometric indices from the drainage pattern. Upper and Middle Pleistocene uplift rates are obtained by fossil shoreline mapping and preliminary U/Th dating of associated coastal deposits. Extrapolation of these rates combined to analyses of sea-level referential data and spatial relationships between marine terraces/rasas and other geological markers lead us to tentatively propose an age for the highest coastal indicators (purported the oldest). Values of morphometric indices showing correlations with uplift rate allow us to analyze uplift variation on area devoid of coastal sequence. Geological and geomorphological data suggest that coastal uplift probably occurred since the Middle Miocene. It resulted in the emergence of the Algiers massif, followed by the Sahel ridge massif. The Sahel ridge has asymmetrically grown by folding from west to east and was affected by temporal variation of uplift. Compared to previous study, the location of the Sahel fold axis has been shifted offshore, near the coast. The Chenoua fault vertical motion does not offset significantly the coastal sequence. Mean apparent uplift rates and corrected uplift rates since 120 ka are globally steady all along the coast with a mean value of 0.055 ± 0.015 mm/year (apparent) and of 0.005 ± 0.045 mm/year (corrected for eustasy). Mean apparent coastal uplift rates between 120 and

  16. The interaction between surface processes and tectonics during the late Quaternary in the Middle Volturno River valley (southern Italy): new morpho-stratigraphic constraints from fluvial terraces

    Science.gov (United States)

    Amato, Vincenzo; Patrizio Ciro Aucelli, Pietro; Cesarano, Massimo; Filocamo, Francesca; Giralt, Santiago; Leone, Natalia; Rosskopf, Carmen Maria; Scorpio, Vittoria

    2017-04-01

    The Middle Volturno River valley is located in the inner part of the Southern Apennines of Italy, between the SW slope of the Matese Massif and the NE slopes of the Caserta mountains and is underlain by Meso-Cenozoic carbonate rocks and Miocene Flysch deposits. The study sector includes the lower Calore River valley and, below the Calore-Volturno confluence, the valley portion that extends until the Triflisco gorge, from Telese village to the Volturno dam. It is generally E-W, NW-SE and NE-SW elongated and characterized by rectilinear and meandering fluvial patterns. The main infilling of the two valley portions is locally preserved as remnants of fluvial terraces hanging over the local base level up to ca. 30-40 m. It is generally interfingered with and covered by several generations of alluvial fan and travertine deposits. New Ar/Ar datings on tephra layers interbedded in the oldest generations of the alluvial fan deposits and new U/Th datings on travertine deposits, allowed to constrain the main infilling to the late Middle and the early Upper Pleistocene. Both deposits are locally covered by the Campanian Ignimbrite Formation (CI, 39 ky BP) and are interested by high-angle faults generated during extensional tectonic phases that affected this sector of the Apennine chain since the Middle Pleistocene. Furthermore, the geomorphological analyses of aerial photos and topographic maps (1:5000 in scale) highlight the presence of a flight of fluvial terraces younger than the CI deposits that can be grouped into four orders. The stratigraphical data, based on field surveys and boreholes analyses, supported by new tephrostratigraphical constraints and literature data, allow to refer the older orders (I and II) to the late Upper Pleistocene. The III and IV orders, instead, can be referred to the early Holocene and historical times, respectively. These chronological constraints allow to hypothesize that the genesis of the I and II orders seem to be driven by late

  17. The Eco-Refurbishment of a 19th Century Terraced House: Energy and Cost Performance for Current and Future UK Climates

    Directory of Open Access Journals (Sweden)

    Haniyeh Mohammadpourkarbasi

    2013-02-01

    Full Text Available The UK government, responding to concerns over climate change impacts, has undertaken to reduce CO2 emissions to 80% of 1990 levels by 2050. This scale of reduction will require major improvements in the energy efficiency of the existing UK building stock, which is the dominant consumer of fossil fuel-generated energy. Housing is a key sector, and since 70% of all current homes in the UK will still exist in 2050 then low carbon refurbishment is critical if CO2 reduction goals are to be met. This paper uses computer modeling to examine the annual operational energy performance, long term energy cost savings and internal thermal conditions for a 19th century terraced house that was eco-refurbished to near a Passivhaus standard. The dwelling was modeled for three locations (Edinburgh, Manchester and London using current and future climate scenarios (2020s and 2050s under high carbon emission scenarios. Simulation results suggest that there would be very little diminution in heating demand in the future for the house with no refurbishment, whilst the eco-refurbishment produced a significant reduction in energy demand and CO2 emissions. Analysis of the payback period and net present value indicate that the economic optimum varies according to energy prices and that the high construction costs incurred for an eco-refurbishment to a near Passivhaus standard could not be justified in terms of a cost/benefit analysis.

  18. Habitat analysis of Luciola lateralis especially around Yatoda, terraced paddy field in the narrow valley; Yatoda wo chushin to suru heikebotaru no seisoku kankyo no kaiseki

    Energy Technology Data Exchange (ETDEWEB)

    Shibue, K. [Chiba University, Chiba (Japan); Oba, N. [Yokosuka City Museum, Kanagawa (Japan); Fujii, E. [Chiba University, Chiba (Japan). Faculty of Horticulture

    1996-04-10

    In order to learn the relationship between diversity in organisms living in wet lands and the environmental factors that support the organisms, an analysis was made on living environment for Luciola lateralis around Yatoda (terraced paddy field in the narrow valley, the Yato). The environment is composed of two types of geography: type I, a steep topography on the whole, in which trees grow thickly, widths of the valleys embracing swamplands (Yato) are narrow, soils are dry, and height of water level above paths between rice fields is high; and type II, a topography open on the whole, in which Yatos have greater width, soils are moister, and height of water level above the paths is lower. The firefly population has decreased as the Yato rice fields have been abandoned. This signifies that artificial disturbance of the environment at an adequate degree, such as continuation of rice field cultivation, offers a stable living environment for fireflies. Preservation of farming village environment as a whole including land utilization for rice fields, existence of woods on the mountain slopes and water channels has close relation with maintenance of firefly population density. Fireflies have been verified hitherto of their living in various environments, which has been regarded impossible to be determined impartially. The present study has elucidated two types of living environments acceptable for fireflies, and analysis was made on the qualitative phenomena that have been observed so far. 24 refs., 4 figs., 2 tabs.

  19. A contribution to the characterisation of Iron Age agrarian spaces: documentation and pollen analysis of a possible cultivation terrace in the castro of Follente (Caldas de Reis, Pontevedra

    Directory of Open Access Journals (Sweden)

    López Sáez, José Antonio

    2009-12-01

    Full Text Available A series of samples extracted from the stratigraphic profile of a possible cultivation terrace located in the surroundings of an Iron Age hillfort in Galicia were used for pollen analysis. The combined results of both the stratigraphic information and the pollen analysis allow the proposal of a sequence of landscape transformation where, rather unexpectedly, the greater intensification in the use of the area, corresponding to the occupation of the hillfort and the construction of cultivation structures, coincides with an increase in the forested areas in the environment. However, the results of the analysis also document the construction of a landscape in which the effects of human action are progressively more visible.

    Se presentan los resultados de una caracterización palinológica realizada en un perfil en el cual se ha identificado una probable estructura de cultivo artificial (terraza de finales de la Edad del Hierro, asociada a un castro en Galicia. El análisis combinado de las evidencias estratigráficas y palinológicas permite proponer una secuencia de transformación del paisaje en la que, de forma poco esperable, la mayor intensificación en el uso de la zona, correspondiente a la ocupación del castro y el desarrollo de estructuras agrarias, coincide con un episodio de incremento de los espacios forestales en el entorno. Sin embargo, el análisis realizado permite documentar la progresiva construcción de un paisaje cada vez más antropizado y donde los efectos de la acción humana se van haciendo más visibles.

  20. ANALYSIS OF CLIMATIC AND SOCIAL PERFORMANCES OF LOW COST TERRACE HOUSING (LCTH: INTRODUCING THE AFFORDABLE QUALITY HOUSING (AQH CONCEPT IN MALAYSIA

    Directory of Open Access Journals (Sweden)

    Noor Hanita Abdul Majid

    2009-03-01

    Full Text Available Low cost terrace housing (LCTH is the most common form and popular typology of public housing in Malaysia. The provision of the houses is deemed to be the most suitable to fulfil the needs to house low income families, and also as an alternative to high rise low cost housing. Since the implementation of these housing types, development on the layout and sizes of the house has taken place to provide for better living conditions. Literature review on the current LCTH suggested that there are deficiencies in fulfilling the requirements to provide quality and affordable housing for the low income families. This paper presents the scenario of the LCTH design based on secondary findings by researchers on housing in Malaysia. The secondary data provided the grounds for the proposal of affordable and quality housing (AQH to handle the problems that occurred at the LCTH. Both social and climatic considerations are included in the AQH, addressing issues on privacy, segregation of genders and community interaction; along with thermal comfort and natural ventilation. Decisions on the AQH are carefully extracted from a comparison analysis in the view to improve the current conditions. In order to verify some of the decisions on climatic design strategies, simulation results are presented. The results indicated that the design decisions have managed to improve on the natural ventilation conditions at the low cost houses. With reservations on the social conditions that are yet to be tested at the actual houses, the AQH has proven to be a step forward towards the provision of a better living environment.

  1. The impact of agriculture terraces on soil organic matter, aggregate stability, water repellency and bulk density. A study in abandoned and active farms in the Sierra de Enguera, Eastern Spain.

    Science.gov (United States)

    Cerdà, Artemi; Burguet, Maria; Keesstra, Saskia; Prosdocimi, Massimo; Di Prima, Simone; Brevik, Erik; Novara, Agata; Jordan, Antonio; Tarolli, Paolo

    2016-04-01

    Soil erosion, land degradation, lack of organic matter, erodible soils, rock outcrops… are a consequence of the human abuse and misuse of the soil resources. And this is a worldwide environmental issue (Novara et al., 2011; Vanlauwe et al., 2015; Musinguzi et al., 2015; Pereira et al., 2015; Mwagno et al., 2016). Agriculture terraces are a strategy to reduce the soil erosion, improve the soil fertility and allow the ploughing (Cerdà et al., 2010; Li et al., 2014). Although this idea is well accepted there are few scientific evidences that demonstrate that soils in the terraced areas are more stable, fertile and sustainable that the soil in non terraced areas. In fact, the ploughing in comparison to the abandoned or not ploughed land results in the soil degradation (Lieskovský and Kenderessy, 2014; Gao et al., 2015; Parras-Alcántara et al., 2014). This is mainly due to the lack of vegetation that increase the surface runoff (Cerdà et al., 1998; Keesstra et al., 2007). And why is necessary to develop also in terraced landscapes soil erosion control strategies (Mekonnen et al., 2015a; Mekonnen et al., 2015b; Prosdocimi et al., 2016). Our objective was to assess the soil organic matter content (Walkley and Black, 1934), the soil bulk density (ring method), the aggregate stabilility (drop impact) and the water repellency (Water Drop Penetration Time test) in four study sites in the Sierra de Enguera. Two sites were terraced: one abandoned 40 years before the measurements and the other still active with olive crops. And two control sites non-terraced. We used the paired plot strategy to compare the impact of terracing and abandonment. At each site we collected randomly 50 soil samples at 0-2 cm, 4-6 and 8-10 cm depth. At each sampling point 100 WDPT measurements where carried out, and one sample for the bulk density, and one for the organic matter, and one for the soil aggregate stability were collected. The soil surface samples shown the largest differences. The

  2. 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.

  3. Effects of soil moisture retention on ice distribution and active layer thickness subject to seasonal ground temperature variations in a dry loess terrace in Adventdalen, Svalbard.

    Science.gov (United States)

    Schuh, Carina; Frampton, Andrew; Christiansen, Hanne

    2017-04-01

    The active layer constitutes an important part of permafrost environments. Thermal and hydrological processes in the active layer determine local phenomena such as erosion and hydrological and ecosystem changes, and can have important implications for the global carbon-climate feedback. Permafrost degradation usually starts with a deepening of the active layer, followed by the formation of a talik and the subsequent thawing of permafrost. An increasing active layer thickness is therefore regarded as an indicator of permafrost degradation. The importance of hydrology for active layer processes is generally well acknowledged on a conceptual level, however the in general non-linear physical interdependencies between soil moisture, subsurface water and heat fluxes and active layer thaw progression are not fully understood. In this study, high resolution field data for the period 2000-2014 consisting of active layer and permafrost temperature, active layer soil moisture, and thaw depth progression from the UNISCALM research site in Adventdalen, Svalbard, is combined with a physically-based coupled cryotic and hydrogeological model to investigate active layer dynamics. The site is a loess-covered river terrace characterized by dry conditions with little to no summer infiltration and an unsaturated active layer. A range of soil moisture characteristic curves consistent with loess sediments is considered and their effects on ice and moisture redistribution, heat flux, energy storage through latent heat transfer, and active layer thickness is investigated and quantified based on hydro-climatic site conditions. Results show that soil moisture retention characteristics exhibit notable control on ice distribution and circulation within the active layer through cryosuction and are subject to seasonal variability and site-specific surface temperature variations. The retention characteristics also impact unfrozen water and ice content in the permafrost. Although these effects

  4. Constraints on timing and rates of strath terrace formation on actively uplifting anticlines in the foreland of the Chinese Tien Shan.

    Science.gov (United States)

    Bufe, A.; Burbank, D. W.; Chen, J.; Liu, L.; Li, T.; Thompson, J. A.

    2014-12-01

    The formation of strath surfaces (fluvially created, sub-horizontal erosion surfaces) requires that the rate of lateral erosion outpaces the rate of incision of a river. The change from incision to strath cutting has commonly been linked to a decrease of incision rates due to shielding of the river bed by a thick sediment cover1. Straths are abandoned when the bed cover is reduced and incision resumes. A more recent study suggests that strath terrace formation might be linked to a change between a braided and a single-thread river2. Finally, several models have explored strath formation due to inherent dynamics of meandering systems3,4. In the foreland of the Tian Shan in northwest China, weakly consolidated Pliocene sand and siltstones are being actively uplifted at rates of 1 - 3 mm/y by a series of detachment anticlines. A number of elevated, several-kilometer-wide planation surfaces bear witness to a history of multiple strath cutting events by braided streams. In contrast, modern rivers incise into the uplifting folds creating 10 - 200 m deep canyons while the up- and downstream alluvial fans remain unincised. We use GIS analysis, field mapping, and OSL dating to describe incision and beveling of the folds. Our chronologic data reveal at least 2 - 3 beveling events over the last 40 ky on the Mutule fold. We find that lateral erosion of the bedrock during beveling events occurs at rates that are more than an order of magnitude higher than average incision rates. During times of incision (which can be tens of thousands of years long), lateral erosion rates need to be considerably lower in order to explain the formation of narrow canyons. Thus, our observations of scale, rate, and intermittency of strath cutting, seem difficult to reconcile with models that explain strath formation by variations of the incision rate1 or intrinsic meandering dynamics under steady forcing3,4. The critical requirement to explain our observations appears to be repeated changes in the

  5. Radiogenic 3He/4He Estimates and Their Effect on Calculating Plio-Pleistocene Cosmogenic 3He Ages of Alluvial-Fan Terraces in the Lower Colorado River Basin, USA

    Science.gov (United States)

    Fenton, C.; Pelletier, J.

    2005-12-01

    Several alluvial-fan terraces near Topock, AZ were created by successive entrenchment of Pliocene and Pleistocene alluvial-fan gravels shed from the adjacent Black Mountains along the lower Colorado River corridor below Hoover Dam. These fans interfinger with and overlie main-stem Colorado River sands and gravels and grade to terrace levels that correspond with pre-existing elevations of the Colorado River. Absolute dates for the ages of Quaternary deposits on the lower Colorado River are rare and cosmogenic 3He age estimates of these surfaces would help constrain the timing of aggradation and incision in the lower Colorado River corridor. We analyzed individual basalt boulders from several terrace surfaces for total 3He/4He concentrations to calculate cosmogenic 3He ages of each fan terrace; 3He/4He values, expressed as R/Ra where Ra is the 3He/4He of air, range from 0.29 to 590. Black Mountain volcanic rocks have reported K-Ar ages between 15 and 30 Ma and basalt samples from adjacent alluvial fans contain 0.42 to 47× 1012 at/g of 4He, which has likely accumulated due to nuclear processes. The amount of radiogenic 3He/4He can be significant in old rocks with young exposure ages and can complicate determination of cosmogenic 3 He content. Alpha-decay of U, Th, and their daughter isotopes produces large amounts of 4He, whereas significant amounts of radiogenic 3He are only produced through the neutron bombardment of Li and subsequent beta-decay of tritium. We measured Li, U, Th, major and rare-earth element concentrations in whole-rock basalts and mineral separates. These concentrations are used to estimate the ratio of radiogenic helium contributed to the total helium system in our samples. Li concentrations typically range from 6 to 17 ppm, with one outlier of 62 ppm. U contents range from <0.1 to 2.7 ppm and Th contents range from 0.4 to 15.3 ppm. Based on these values, our calculations predict that the average radiogenic helium (R/Ra) contributed to the total

  6. Dimensionamento de terraços de infiltração pelo método do balanço volumétrico Infiltration terrace design by volumetric balance method

    Directory of Open Access Journals (Sweden)

    Jarbas H. de Miranda

    2004-12-01

    Full Text Available As práticas de conservação de solo permitem o controle de perdas de solo e água em áreas agriculturáveis, objetivando assim a maximização do lucro sem provocar a redução da capacidade produtiva. Ante essa importância, há necessidade de se adotar procedimentos técnicos para o dimensionamento de estruturas conservacionistas. Assim, objetivou-se, com o presente trabalho, o desenvolvimento de um modelo computacional em linguagem Visual Basic 6.0, para dimensionamento de terraços em nível. O modelo foi aplicado para 3 localidades do Estado de São Paulo (Araçatuba, Piracicaba e Natividade da Serra. Pelos resultados obtidos, os valores da largura da seção parabólica de canais de terraço em nível de 0,5 m de profundidade para as 3 localidades, com período de retorno de 5 anos, foram de 3,30, 3,34 e 3,80 m, respectivamente.Soil conservation practices allow soil and water loss control in agricultural areas, aiming the maximization of profit without provoking reduction of yield potential. There is need to use technical procedures to design soil conservation structures. Therefore, the aim of the present work was the development of a computational model, in Visual Basic 6.0 language, for design of contour terrace. The model was applied for three municipalities of São Paulo State (Araçatuba, Piracicaba and Natividade da Serra. From the results obtained, it may be concluded that the width of a parabolic section contour terrace channel for these localities, with a return period of 5 years, was 3.30, 3.34 and 3.80 m, respectively, with 0,5 m of depth.

  7. Reconhecimento de unidades deposicionais de média e baixa encosta no município de Lapa (PR por meio da construção de topossequências / The recognition of deposit units in the low and medium terraces in Lapa (PR, Brazil through the construction of toposequences

    Directory of Open Access Journals (Sweden)

    Melina Mara de Souza

    2009-08-01

    Full Text Available ResumoA construção de topossequências para reconhecimento de unidades deposicionais de média e baixa encosta no município de Lapa (PR foi usada para identificar as propriedades morfológicas, texturais e de estrutura interna dos depósitos de média e baixa encosta com vistas ao reconhecimento e seu significado paleoidrológico. A metodologia consistiu em levantamento topográfico de encosta, sondagens com trado holandês, descrição em campo dos materiais sedimentares, pedológico e paleopedológico que recobrem a encosta, análise do teor de matéria orgânica e construção de topossequências para reconhecimento da distribuição espacial destes materiais sobre a encosta. Foram construídas dez topossequências que resultaram na identificação das unidades sedimentares e pedológicas que formam a encosta e na identificação da sua distribuição tridimensional. Nas porções de média e baixa encosta da área foram identificados, além dos diferentes tipos de rocha, três horizontes-organo-minerais soterrados, três unidades alúvio-coluviais e duas aluviais. Os três horizontes organo-minerais auxiliaram na definição da estratigrafia local. A análise das propriedades dos depósitos que recobrem a média e baixa encosta colocou em evidência processos aluviais como dominantes na deposição das unidades sedimentares.AbstractThe construction of topo-sequences for the identification of deposit units at low and medium terraces in Lapa (PR was used to verify the morphology, texture and internal structure properties of the low and medium terraces in order to establish their paleo-hydrological meaning. The methodology consisted in a topographic survey of the terraces, sampling with a Dutch auger, field description of the sedimentary, pedological and paleopedological materials which occur in the terraces, analysis of the organic content, and construction of the topo-sequences for identification of the spatial distribution of these

  8. Structural concept and detailing of a 3-litre-terraced houses on the occasion of modernization measures.; Bauliche Konzeptentwicklung fuer eine 3-Liter-Reihenhauszeile im Rahmen von Modernisierungsmassnahmen in Mannheim-Gartenstadt

    Energy Technology Data Exchange (ETDEWEB)

    Reiss, Johann; Erhorn, Hans [Fraunhofer-Institut fuer Bauphysik (IBP), Abteilung Waermetechnik, Nobelstrasse 12, 70569 Stuttgart (Germany)

    2004-12-01

    Between 2001 and 2008, extensive refurbishment measures including partial renovation, complete modernisation, demolition works and subsequent new building development are scheduled for the residential area of Mannheim-Gartenstadt. A total of 10 two-storey residential houses built in the 1930s and the 1950s (comprising about 230 flats) are going to be refurbished. The flats are in a poor condition, not meeting nowadays standards regarding construction and technical installations. By conducting these structural measures, the GBG Mannheim housing society also follows the aim of improving the residential quarter's attractiveness. Three buildings, including 68 flats, were to be modernised by the end of 2003. So far, refurbishment measures merely complied with the statutory requirements stipulated in the German regulations on energy conservation (EnEV), but future retrofitting measures for a terrace with 6 dwelling houses are to achieve a level of energy which will exceed these requirements by far. The energy performance of these buildings is to be substantially improved, with the aim of turning them into '3-litre houses'. Though this concept has been successfully implemented in new residential buildings, it is still a challenge for construction in existing buildings. Low-energy buildings with an annual primary energy demand for heating of less than 34 kWh/m{sup 2}a (inclusive of auxiliary energy) are referred to as '3-litre houses'. This corresponds to the primary energy content of 3 litres of heating oil. (Abstract Copyright [2004], Wiley Periodicals, Inc.) [German] Im Wohngebiet Mannheim-Gartenstadt erfolgen in den Jahren 2001 bis 2008 umfangreiche Teilmodernisierungs-, Vollmodernisierungs- und Abbruchmassnahmen sowie anschliessende Neubebauung. Insgesamt werden 10 zweigeschossige Wohnbauten mit rund 230 Wohnungen aus den 1930er und 1950er Jahren modernisiert. Die Wohnungen sind sanierungsbeduerftig, da sie sowohl baulich als auch

  9. Basal terraces on melting ice shelves

    National Research Council Canada - National Science Library

    Dutrieux, Pierre; Stewart, Craig; Jenkins, Adrian; Nicholls, Keith W; Corr, Hugh F. J; Rignot, Eric; Steffen, Konrad

    2014-01-01

    Ocean waters melt the margins of Antarctic and Greenland glaciers, and individual glaciers' responses and the integrity of their ice shelves are expected to depend on the spatial distribution of melt...

  10. Traditional landscape and rural development: comparative study in three terraced areas in northern, central and southern Italy to evaluate the efficacy of GAEC standard 4.4 of cross compliance

    Directory of Open Access Journals (Sweden)

    Mauro Agnoletti

    2011-08-01

    Full Text Available The recent National Strategic Plan 2007-2013 has introduced landscape as a strategic objective of the rural sector. This represents a minor revolution in the way of visualizing the role of the landscape, together with that of agriculture and the rural territory as a whole, and demonstrates the importance of treating the landscape with a systematic point of view. As part of the Efficond project, three sample areas have been identified, each of about 800-1000 hectares, in zones with important historical - cultural landscapes that are included in the National Catalogue of Historical Rural Landscapes. For each sample area a methodology has been applied, defined Historical Cultural Evaluation Approach, developed as part of a project for the monitoring of the Tuscan landscape that we have simplified and adapted. This methodology is based on the consideration that the landscape is the result of the centuries-old interaction between man and the environment, and so to define an element of the landscape as characteristic it is necessary to evaluate the land use dynamics and landscape changes that took place in the past, identifying those that have persisted for a long time, are slowly evolving or stabilized. The study of the historical landscape, which in the proposed methodology refers to the 50’s, has been done through the interpretation and analysis of aerial photographs taken on the GAI flight in 1954, and has allowed the characteristic, traditional and historical elements of that landscape to be identified and an insight to be gained into the cultural identity of the area. Through the creation of specific indices of density and intensity of the terracing obtained by photo-interpretation, field surveys and GIS elaborations, it was possible to classify the sample areas for this specific and important landscape element, compare the results in two periods and evaluate their frequency in the territory. Multi-temporal comparative analysis is being used

  11. Diversidade da vegetação pós-incêndio em terraços abandonados e ladeiras não cultivadas em Valença, Espanha Diversity of post-fire vegetation on abandoned terraces and outcrop slopes in Valencia, Spain

    Directory of Open Access Journals (Sweden)

    Maria Fátima Vieira Santos

    2003-06-01

    Full Text Available A história de uso do solo exerce influência na composição de espécies e, portanto, deve se refletir na diversidade da vegetação em regeneração depois do fogo. Para testar essa hipótese foram comparadas comunidades vegetais em terraços, áreas utilizadas agricolamente, com comunidades em ladeiras livres do uso agrícola, em Valença, Espanha. A regeneração da vegetação de matorral com Ulex parviflorus foi amostrada aos 3, 9, 15 e 21 meses depois do incêndio. Foram estimados o número de espécies, o recobrimento vegetal e a diversidade e analisadas as curvas dominância-diversidade e espécies-área. Nas comparações entre os dois habitats (terraço e ladeira, não houve diferença no número de espécies nem na diversidade. Entretanto, o recobrimento vegetal foi maior nos terraços (62,6% que nas ladeiras (39,9%. As curvas de dominância-diversidade dos dois habitats caracterizaram-se por pendentes acentuadas na parte superior e concentração de mais da metade das espécies com recobrimento inferior a 1% na parte inferior, explicável pelo fenômeno biológico da dominância. O modelo que relacionou o ganho de espécies com o aumento da área da amostra evidenciou que aos três meses depois do fogo o número de espécies nas ladeiras foi mais elevado que nos terraços.History of soil use influences the association of plant species thus it must be reflected in the diversity of the vegetation under post-fire regeneration. Plant communities were compared to verify this hypothesis on abandoned terraces and outcrop slopes in Valencia, Spain. Regeneration of the vegetation of "matorral" with Ulex parviflorus was sampled after 3, 9,15 and 21 months post-fire, based on the number of species found, plant cover and diversity, dominance/diversity and species/area curves. Comparisons between the two habitats (terraces and slopes showed no difference in the number and diversity of species. Plant cover was greater on terraces (62.5% than on

  12. Comportamento físico-hídrico de um podzólico vermelho-amarelo câmbico fase terraço sob diferentes sistemas de manejo Physico-hydric behavior of a red yellow cambic podzolic soil terrace phase under different management systems

    Directory of Open Access Journals (Sweden)

    Eduardo Jorge Maklouf Carvalho

    1999-02-01

    Full Text Available O estudo foi desenvolvido no município de Viçosa, MG, na fazenda Fundão, pertencente ao câmpus da Universidade Federal de Viçosa (UFV, com o fim de verificar o comportamento físico- hídrico de um Podzólico Vermelho-Amarelo câmbico fase terraço, sob diferentes sistemas de manejo. Foi utilizado delineamento experimental em blocos ao acaso, com cinco tratamentos e quatro repetições. Os tratamentos foram: 1 - arado de aiveca; 2 - arado de discos; 3 - grade pesada; 4 - plantio direto; 5 - testemunha, com as parcelas mantidas em pousio. Os parâmetros avaliados foram: teores de matéria orgânica; granulometria; densidade do solo; densidade de partículas; porosidade total, macroporosidade, microporosidade, agregados e curva de retenção da água no solo. Pode-se concluir que: o uso da grade pesada reduz os teores de matéria orgânica na camada de 0-15 cm; a utilização da grade pesada acarreta adensamento da camada superficial; o revolvimento do solo ocasiona maior macroporosidade; o sistema plantio direto proporciona menor desagregação do solo; o sistema plantio direto garante maior retenção de água.The study was carried out in the county of Viçosa, MG, Brazil, in the campus of Universidade Federal de Viçosa (UFV. The objective was to study the physico-hydric behavior of a Red Yellow Cambic Podzolic soil terrace phase under different management systems. The experimental design was a completely randomized block design, with five treatments and four replications. Treatments were: 1- moldboard plow; 2- disk plow; 3- heavy disk harrow; 4- no tillage; 5- control (fallow. Organic matter, texture, bulk density, particle density, total porosity, macro-porosity and micro-porosity, agregates and soil moisture tension curves were measured. Results indicate that: soil organic matter is slightly greater in no-tillage and control plots, and reduces in heavy disk plots in the surface 15 cm of the profile; cultivation with heavy machinery

  13. a sedimentologic analysis of terrace sediments from the pawmpawm

    African Journals Online (AJOL)

    PUBLICATIONS1

    chanics of particle entrainment, particle trans- port and deposition need to include the descrip- tion and comparison of particle shapes. (Hayakawa and Oguchi, 2005). Studies by. Tucker and Slingerland (1996) indicate that an increase in fine sediment in the channel reduces geometric mean particle size and gravel perme-.

  14. Oleophobic properties of the step-and-terrace sapphire surface

    Science.gov (United States)

    Muslimov, A. E.; Butashin, A. V.; Kanevsky, V. M.

    2017-03-01

    Sapphire is widely used in production of optical windows for various devices due to its mechanical and optical properties. However, during operation the surface can be affected by fats, oils, and other organic contaminations. Therefore, it is important to improve the oleophobic properties of sapphire windows. In this study, we investigate the interaction of a supersmooth sapphire surface with oleic acid droplets, which imitate human finger printing. It is established that chemical-mechanical polishing with additional annealing in air, which leads to the formation of an atomically smooth sapphire surface, makes it possible to significantly improve the oleophobic properties of the surface. The results are analyzed using the Ventsel-Deryagin homogeneous wetting model.

  15. Abbot Close Nursing Home, St. Marys Terrace, Askeaton, Limerick.

    LENUS (Irish Health Repository)

    Hegerl, Ulrich

    2009-11-23

    Abstract Background Suicide and non-fatal suicidal behaviour are significant public health issues in Europe requiring effective preventive interventions. However, the evidence for effective preventive strategies is scarce. The protocol of a European research project to develop an optimized evidence based program for suicide prevention is presented. Method The groundwork for this research has been established by a regional community based intervention for suicide prevention that focuses on improving awareness and care for depression performed within the European Alliance Against Depression (EAAD). The EAAD intervention consists of (1) training sessions and practice support for primary care physicians,(2) public relations activities and mass media campaigns, (3) training sessions for community facilitators who serve as gatekeepers for depressed and suicidal persons in the community and treatment and (4) outreach and support for high risk and self-help groups (e.g. helplines). The intervention has been shown to be effective in reducing suicidal behaviour in an earlier study, the Nuremberg Alliance Against Depression. In the context of the current research project described in this paper (OSPI-Europe) the EAAD model is enhanced by other evidence based interventions and implemented simultaneously and in standardised way in four regions in Ireland, Portugal, Hungary and Germany. The enhanced intervention will be evaluated using a prospective controlled design with the primary outcomes being composite suicidal acts (fatal and non-fatal), and with intermediate outcomes being the effect of training programs, changes in public attitudes, guideline-consistent media reporting. In addition an analysis of the economic costs and consequences will be undertaken, while a process evaluation will monitor implementation of the interventions within the different regions with varying organisational and healthcare contexts. Discussion This multi-centre research seeks to overcome major challenges of field research in suicide prevention. It pools data from four European regions, considerably increasing the study sample, which will be close to one million. In addition, the study will gather important information concerning the potential to transfer this multilevel program to other health care systems. The results of this research will provide a basis for developing an evidence-based, efficient concept for suicide prevention for EU-member states.

  16. Oleophobic properties of the step-and-terrace sapphire surface

    Energy Technology Data Exchange (ETDEWEB)

    Muslimov, A. E., E-mail: amuslimov@mail.ru; Butashin, A. V.; Kanevsky, V. M. [Russian Academy of Sciences, Shubnikov Institute of Crystallography, Federal Research Center “Crystallography and Photonics” (Russian Federation)

    2017-03-15

    Sapphire is widely used in production of optical windows for various devices due to its mechanical and optical properties. However, during operation the surface can be affected by fats, oils, and other organic contaminations. Therefore, it is important to improve the oleophobic properties of sapphire windows. In this study, we investigate the interaction of a supersmooth sapphire surface with oleic acid droplets, which imitate human finger printing. It is established that chemical–mechanical polishing with additional annealing in air, which leads to the formation of an atomically smooth sapphire surface, makes it possible to significantly improve the oleophobic properties of the surface. The results are analyzed using the Ventsel–Deryagin homogeneous wetting model.

  17. Restoration of degraded agricultural terraces: rebuilding landscape structure and process.

    Science.gov (United States)

    LaFevor, M C

    2014-06-01

    The restoration of severely degraded cropland to productive agricultural capacity increases food supply, improves soil and water conservation, and enhances environmental and ecological services. This article examines the key roles that long-term maintenance plays in the processes of repairing degraded agricultural land. Field measurements from Tlaxcala, Mexico stress that restoring agricultural structures (the arrangements of landforms and vegetation) is alone insufficient. Instead, an effective monitoring and maintenance regime of agricultural structures is also crucial if the efforts are to be successful. Consequently, methods of wildland restoration and agricultural restoration may differ in the degree to which the latter must plan for and facilitate a sustained human involvement. An improved understanding of these distinctions is critical for environmental management as restoration programs that employ the technologies of intensive agriculture continue to grow in number and scope. Copyright © 2013 Elsevier Ltd. All rights reserved.

  18. The simple agricultural kit improving life for Nepal's terrace farmers ...

    International Development Research Centre (IDRC) Digital Library (Canada)

    2017-08-16

    Aug 16, 2017 ... Nanotech extends shelf life of fresh fruit. An international research team is developing nanotechnology-based applications of hexanal, a natural plant extract that extends the storage lif. View moreNanotech extends shelf life of fresh fruit ...

  19. 76 FR 53975 - In the Matter of Professional Service Industries, Inc., Oakbrook Terrace, IL; Confirmatory Order...

    Science.gov (United States)

    2011-08-30

    ... of its Radiation Protection Program content and implementation; (5) provide annual reports of the... restricted area perimeter; (7) prevent unauthorized personnel from being within the restricted area... the statement will be provided to the employee, the employee's immediate supervisor, and the local...

  20. Organic matter source and degradation as revealed by molecular biomarkers in agricultural soils of Yuanyang terrace

    OpenAIRE

    Li, Fangfang; Pan, Bo; Zhang, Di; Yang, Xiaolei; Li, Hao; Liao, Shaohua; Ghaffar, Abdul; Peng, Hongbo; Xing, Baoshan

    2015-01-01

    Three soils with different tillage activities were collected and compared for their organic matter sources and degradation. Two soils (TD and TP) with human activities showed more diverse of chemicals in both free lipids and CuO oxidation products than the one (NS) without human activities. Branched alkanoic acids only accounted for less than 5% of lipids, indicating limited microbial inputs in all three investigated soils. The degradation of lignin in NS and TD was relatively higher than TP,...

  1. Aclare House Nursing Home, 4 - 5 Tivoli Terrace South, Dun Laoghaire, Co. Dublin.

    LENUS (Irish Health Repository)

    Richiardi, Lorenzo

    2012-05-15

    We investigated the association between occupational history and upper aerodigestive tract (UADT) cancer risk in the ARCAGE European case-control study. The study included 1,851 patients with incident cancer of the oral cavity, oropharynx, hypopharynx, larynx or esophagus and 1,949 controls. We estimated odds ratios (OR) and 95% confidence intervals (CI) for ever employment in 283 occupations and 172 industries, adjusting for smoking and alcohol. Men (1,457 cases) and women (394 cases) were analyzed separately and we incorporated a semi-Bayes adjustment approach for multiple comparisons. Among men, we found increased risks for occupational categories previously reported to be associated with at least one type of UADT cancer, including painters (OR = 1.74, 95% CI: 1.01-3.00), bricklayers (1.58, 1.05-2.37), workers employed in the erection of roofs and frames (2.62, 1.08-6.36), reinforced concreters (3.46, 1.11-10.8), dockers (2.91, 1.05-8.05) and workers employed in the construction of roads (3.03, 1.23-7.46), general construction of buildings (1.44, 1.12-1.85) and cargo handling (2.60, 1.17-5.75). With the exception of the first three categories, risks both increased when restricting to long duration of employment and remained elevated after semi-Bayes adjustment. Increased risks were also found for loggers (3.56, 1.20-10.5) and cattle and dairy farming (3.60, 1.15-11.2). Among women, there was no clear evidence of increased risks of UADT cancer in association with occupations or industrial activities. This study provides evidence of an association between some occupational categories and UADT cancer risk among men. The most consistent findings, also supported by previous studies, were obtained for specific workers employed in the construction industry.

  2. Fine sediment sources in coastal watersheds with uplifted marine terraces in northwest Humboldt County, California

    Science.gov (United States)

    Stephen Sungnome Madrone; Andrew P. Stubblefield

    2012-01-01

    Erosion in the Mill and Luffenholtz Creek watersheds in Humboldt County, California, with their extensive clay soils, can lead to high turbidity levels in receiving bodies of water, increasing the costs of treating water for domestic water supplies. Detailed road and erosion surveys and monitoring of suspended sediment, discharge, and turbidity levels in Mill Creek (3....

  3. Organic matter source and degradation as revealed by molecular biomarkers in agricultural soils of Yuanyang terrace.

    Science.gov (United States)

    Li, Fangfang; Pan, Bo; Zhang, Di; Yang, Xiaolei; Li, Hao; Liao, Shaohua; Ghaffar, Abdul; Peng, Hongbo; Xing, Baoshan

    2015-06-05

    Three soils with different tillage activities were collected and compared for their organic matter sources and degradation. Two soils (TD and TP) with human activities showed more diverse of chemicals in both free lipids and CuO oxidation products than the one (NS) without human activities. Branched alkanoic acids only accounted for less than 5% of lipids, indicating limited microbial inputs in all three investigated soils. The degradation of lignin in NS and TD was relatively higher than TP, probably because of the chemical degradation, most likely UV light-involved photodegradation. Lignin parameters obtained from CuO oxidation products confirmed that woody gymnosperm tissue (such as pine trees) may be the main source for NS, while angiosperm tissues from vascular plant may be the predominant source for the lignins in TD and TP. Analysis of BPCAs illustrated that BC in NS may be mainly originated from soot or other fossil carbon sources, whereas BC in TD and TP may be produced during corn stalk and straw burning. BC was involved in mineral interactions for TD and TP. The dynamics of organic matter needs to be extensively examined for their nonideal interactions with contaminants.

  4. Preliminary report on diatoms from the deep lake terraces, Vestfold Hills, Antarctica

    Digital Repository Service at National Institute of Oceanography (India)

    Setty, M.G.A.P.; Kellogg, D.E.; Kellogg, T.B.

    Deep lake (latitudes 68~'22' and 68~'40'S longitudes 77~'49' and 78~'33'E) is one of the two most saline lakes in the Vestfold Hills, Antarctica. During December 1974, the Antarctic Division of the Australian Department of Science and Technology...

  5. Ground temperatures in ice-cemented ground at Linnaeus Terrace, Dry Valleys, Antarctica, Version 1

    Data.gov (United States)

    National Aeronautics and Space Administration — Soil temperatures were measured with Campbell 107 soil thermistors. Thermistors were placed at 0, 17, 23 (just above the ice-cemented permafrost) and 40 cm depth. To...

  6. Organic matter source and degradation as revealed by molecular biomarkers in agricultural soils of Yuanyang terrace

    Science.gov (United States)

    Li, Fangfang; Pan, Bo; Zhang, Di; Yang, Xiaolei; Li, Hao; Liao, Shaohua; Ghaffar, Abdul; Peng, Hongbo; Xing, Baoshan

    2015-06-01

    Three soils with different tillage activities were collected and compared for their organic matter sources and degradation. Two soils (TD and TP) with human activities showed more diverse of chemicals in both free lipids and CuO oxidation products than the one (NS) without human activities. Branched alkanoic acids only accounted for less than 5% of lipids, indicating limited microbial inputs in all three investigated soils. The degradation of lignin in NS and TD was relatively higher than TP, probably because of the chemical degradation, most likely UV light-involved photodegradation. Lignin parameters obtained from CuO oxidation products confirmed that woody gymnosperm tissue (such as pine trees) may be the main source for NS, while angiosperm tissues from vascular plant may be the predominant source for the lignins in TD and TP. Analysis of BPCAs illustrated that BC in NS may be mainly originated from soot or other fossil carbon sources, whereas BC in TD and TP may be produced during corn stalk and straw burning. BC was involved in mineral interactions for TD and TP. The dynamics of organic matter needs to be extensively examined for their nonideal interactions with contaminants.

  7. 75 FR 67389 - Notice of Availability of the Draft Environmental Impact Statement for the Yesler Terrace...

    Science.gov (United States)

    2010-11-02

    ... Development, HUD. ACTION: Notice. SUMMARY: The Department of Housing and Urban Development (HUD) gives notice to the public, agencies, and Indian tribes that the Seattle Housing Authority and the City of Seattle Human Services Department (Community Development Block Grant (CDBG) Administration Unit) have prepared a...

  8. 76 FR 27083 - Notice of Availability of the Final Environmental Impact Statement for the Yesler Terrace...

    Science.gov (United States)

    2011-05-10

    ... Development, HUD. ACTION: Notice. SUMMARY: The Department of Housing and Urban Development (HUD) gives notice to the public, agencies, and Indian Tribes that the Seattle Housing Authority and the City of Seattle Human Services Department (Community Development Block Grant Administration Unit) have prepared a Final...

  9. Shannagh Bay Nursing Home, 2-3 Fitzwilliam Terrace, Strand Road, Bray, Wicklow.

    LENUS (Irish Health Repository)

    Murphu, JFA

    2011-03-01

    on the issue. This is understandable. Most individuals are healthy during their childhood and have less need of and less interaction with medical services when compared with adults. However, Paediatric litigation does happen and furthermore it is likely to increase in parallel with other specialties. Carroll and Buddenbaum1 have described the pattern of Paediatric litigation in the US. The annual incidence of malpractice claims has been quoted to be as high as 6.6 claims per 100 Paediatricians per year. Almost 30% of Paediatricians have been sued with many being sued on more than one occasion. Of these cases 36% were settled out of court, 33% were dropped by the plaintiff with the remainder going before the judiciary. The authors point out that in the US medical malpractice is a hotly debated issue. Litigation has a questionable impact on health care quality, cost, and access to services. The AMA believes that rising premiums are resulting in the curtailment of medical care particularly in states with high medico-legal rates. The Physician Insurers Association of America (PIAA) is a trade organisation which insures 60% of all private practicing physicians and surgeons has been a useful source of data. In the 20 year period 1985-2005 among a total of 214,226 claims there were 6363 (2.9%) Paediatric claims which ranked it 10th among the 28 specialties covered. The claims arose in equal numbers from the hospital and Paediatrician’s office settings. Common reasons for Paediatric litigation were errors in diagnosis (32%), incorrect performance of a medical or surgical procedure (13%), failure to monitor or manage a case effectively (10%) and medication error (5%). The top five medico-legal conditions were meningitis, routine infant or child checks, newborn respiratory problems, appendicitis and brain-damaged infants as a co-defendant with Obstetrics. Good quality information about litigation is important because the discussion among doctors is frequently confused by anecdotes and inaccuracies.

  10. Erosion and terrace failure due to agricultural land abandonment in a semi-arid environment

    NARCIS (Netherlands)

    Lesschen, J.P.; Cammeraat, L.H.; Nieman, T.

    2008-01-01

    Agricultural land abandonment is currently widely spread in Mediterranean countries and a further increase is expected. Previous research has shown that abandoned fields in semi-arid areas are more vulnerable to gully erosion. The absence of ploughing and slow vegetation recovery cause the formation

  11. Shallow seismic and geomorphic expression of buried wave-cut terrace and erosional valleys off Redi, west coast of India

    Digital Repository Service at National Institute of Oceanography (India)

    Subbaraju, L.V.; Wagle, B.G.

    stream_size 6 stream_content_type text/plain stream_name J_Coast_Res_12_205.pdf.txt stream_source_info J_Coast_Res_12_205.pdf.txt Content-Encoding ISO-8859-1 Content-Type text/plain; charset=ISO-8859-1 ...

  12. Morphotectonic architecture of an India–Madagascar breakup related anomalous submarine terrace complex on the southwest continental margin of India

    Digital Repository Service at National Institute of Oceanography (India)

    Yatheesh, V.; Kurian, P.J.; Bhattacharya, G.C.; Rajan, S.

    or its postulated conjugate region are meagre and ambiguous. In this context, the present study, based on recently acquired as well existing bathymetry, gravity, magnetic and multi-channel seismic reflection data, was carried out to understand...

  13. Lipidic biosignatures in diagenetically stabilized ironstones terraces of Rio Tinto, an acidic environment with analogies to Mars

    Science.gov (United States)

    Sánchez-García, L.; Carrizo, D.; Fernández-Remolar, D.; Parro, V.

    2017-09-01

    The characterization of extreme environments with analogies to Mars is important for understanding if/how life may have thrived in the Red Planet. Río Tinto in SW Spain is an extreme environment with constant acidic waters (mean pH of 2.3) and high concentration of heavy metals, which are direct consequence of the active metabolism of chemolithotrophic microorganisms thriving in the rich polymetallic sulfides present in the massive Iberian Pyritic Belt. Abundant minerals rich in ferric iron and sulfates, which result from the pyrite metabolism (e.g. jarosite, goethite, hematites, etc.) are of special interest for their potential for organics preservation [1]. Here, we investigate the occurrence and preservation of biological signatures in diagenetically stabilized ironstone deposits in Río Tinto, by using geolipidic markers.

  14. Quaternary river terrace formation in the Allier basin, France : a reconstruction based on sand bulk geochemistry and 3-D modelling

    NARCIS (Netherlands)

    Veldkamp, A.

    1991-01-01

    The research presented in this thesis is focussed on a quantitative reconstruction of the effects of past environmental dynamics within a fluvial system. The study area is part of the Allier basin (Limagne) in the Auvergne, Massif Central, France.

    The

  15. Platforms and terraces : bridging participation and GIS in joint-learning for watershed management with the Ifugaos of the Philippines

    NARCIS (Netherlands)

    Gonzalez, R.M.

    2000-01-01

    Complex multi-actor problem situations in natural resource management (NRM) need the convergence of different knowledge processes, first of all, in understanding and agreeing what the problem is before aspiring for joint-action. This is a joint-learning approach in NRM. Geographic

  16. Acute Effects of Exposure to a Traditional Rural Environment on Urban Dwellers: A Crossover Field Study in Terraced Farmland

    Directory of Open Access Journals (Sweden)

    Juyoung Lee

    2015-02-01

    Full Text Available Despite an increasing attention and public preference for rural amenities, little evidence is available on the health benefits of a rural environment. In this study, we identified physiological and psychological benefits of exposure to a rural environment using multiparametric methods. Twelve young male adults participated in a 3-day field experiment (mean ± standard deviation age, 22.3 ± 1.3 years. Sleeping environment, diet program, physical activities, and other factors possibly affecting physiological responses were controlled during experiment period. For all participants, salivary cortisol concentration, heart rate variability, and blood pressure were measured at rural and urban field sites. Self-evaluation questionnaires were administered to analyze the psychological states in two different environments. Volatile compounds in the air were also analyzed to investigate air quality. The data were compared between rural and urban environments. The data showed that exposure to a rural environment reduced stress hormone secretion and sympathetic nervous activity and increased parasympathetic nervous activity. Short-term exposure to a rural environment also improved mood states. Our findings indicate that exposure to a rural environment effectively reduced physiological stress and enhanced psychological well-being.

  17. Incision history of the Colorado River system over the last several Ma from cosmogenic burial dating of high terrace gravels

    Science.gov (United States)

    Darling, A. L.; Karlstrom, K. E.; Kirby, E.; Ouimet, W. B.; Aslan, A.; Granger, D. E.

    2009-12-01

    The incision history of fluvial systems is sensitive to changes in climate, lithologic contrasts, drainage reorganization events, and tectonism. The Colorado River (CR) carries precipitation from the Rocky Mountains to the Gulf of California along a complex longitudinal profile, with a regional knick-zone at Lees Ferry. Features of the upper CR basin profile include a systematically steeper gradient on the Colorado than the Green River, and sub-regional knick-zones. Lithologic contrasts, plotted on the longitudinal profile, weakly correlate with knick-zones and hence appear to be a secondary control on channel steepness. Published incision rate data on the Colorado can be summarized as follows. Grand Canyon incision began 6 Ma with semi-steady incision for the last 4 Ma. Further upstream, incision rates of the Upper Colorado average ca. 150 m/Ma over 10Ma, with a marked increase in incision rates between 10 and 5 Ma near Rifle, CO. Over shorter timescales, lower incision rates (ca. 60 m/Ma) are observed in reaches above knick-zones and much higher rates (~500 m/Ma) are seen within knick-zones. Emerging chronologic constraints are provided by new 40Ar/39Ar dating of basalts associated with fluvial gravels and 26Al /10Be isochron burial dating of gravel deposits. These data will provide new details on the spatio-temporal patterns of incision. Several specific hypotheses can be tested with the evolving datasets: 1) Incision rates along the Colorado watershed increased at ca. 2 - 4 Ma as a consequence of changing climate 2) Differences in incision rate across the knick-zone at Lee’s Ferry are indicative of a transient feature 3) Abandonment of Unaweep Canyon, now known to be 810 +/- 240 ka, instigated knick-zones in Black Canyon and Glenwood Canyon. 4) Spatial variations in incision across the flank of low-velocity mantle in central Colorado are linked to long-wavelength deformation above a dynamic mantle.

  18. Arctic soil development on a series of marine terraces on central Spitsbergen, Svalbard: a combined geochronology, fieldwork and modelling approach

    NARCIS (Netherlands)

    Meij, van der W.M.; Temme, A.J.A.M.; Kleijn, de Christian; Reimann, T.; Heuvelink, G.B.M.; Zwoliński, Zbigniew; Rachlewicz, Grzegorz; Rymer, Krzysztof; Sommer, Michael

    2016-01-01

    Soils in Arctic regions currently enjoy attention because of their sensitivity to climate change. It is therefore important to understand the natural processes and rates of development of these soils. Specifically, there is a need to quantify the rates and interactions between various landscape- and

  19. KARYOTYPE ANALYSIS OF AGAVE MARMORATA AND AGAVE PEACOCKII (AGAVACEAE FROM ALLUVIAL TERRACES OF THE ZAPOTITLÁN RIVER, PUEBLA, MEXICO

    Directory of Open Access Journals (Sweden)

    Saúl Flores-Maya

    2015-11-01

    Full Text Available El objetivo de este estudio fue determinar la distribución espacial, el número cromosómico y el cariotipo deAgave marmorataRoezl yAgave peacockiiCroucher dentro del Valle de Zapotitlán Salinas, Puebla. Este estudio reporta por primera vez el número cromosómico deA. marmoratayA. peacockii, cuyos niveles de ploidía en ambas especies es de 2n=2x=60. Por otra parte, la distribución deA. marmorataen el área estudiada es más amplia respeto deA. peacockiique únicamente se la encuentra al suroeste. La distribución espacial deA. peacockiiestá limitada por la variación en las condiciones del suelo, los tipos de vegetación de la zona, por su condición de diploide (2x y su posible carácter híbrido, por lo tanto, su presencia en la zona depende de la sincronización de la floración de sus progenitores y su capacidad de reproducción sexual y asexual.

  20. Reconstructing Early Pleistocene (1.3 Ma) terrestrial environmental change in western Anatolia: Did it drive fluvial terrace formation?

    NARCIS (Netherlands)

    Veldkamp, A.; Candy, I.; Jongmans, A.G.; Maddy, D.; Demir, T.; Schoorl, J.M.; Schreve, D.; Stemerdink, C.; Schriek, van der T.

    2015-01-01

    A terrestrial environmental reconstruction of an Early Pleistocene landscape from western Anatolia is presented. The basis of this reconstruction is a sedimentary stack comprising fluvial and colluvial slope deposits. Contained within this stack is a sequence comprising two massive laminar calcretes

  1. Archaeological Investigations on the San Antonio Terrace, Vandenberg Air Force Base, California, in Connection with MX Facilities Construction.

    Science.gov (United States)

    1984-01-01

    177 .................................... 3-62 TABLE OF CONTENTS (CONT’D) Chapter Page Gatehouse Project.............................. 3-64 SBa-1036...facilities on Vandenberg were both quite short, with virtually no lag-time between them, there was not the opportunity to divide the archaeological...horizontal shelter, the MAB, and a new gatehouse at the El Rancho Lateral entrance to the base. Major mitigation excavations were completed at the MAB

  2. Tombs, tunnels, and terraces a cultural resources survey of a former ammunition supply point in Okinawa, Japan

    Energy Technology Data Exchange (ETDEWEB)

    Verhaaren, B. T.; Levenson, J. B.; Komine, G.

    2000-02-09

    U.S. forces serving at military bases on foreign soil are obligated to act as good stewards of the cultural and natural resources under their control. However, cultural resources management presents special challenges at U.S. bases in other countries where cultural properties laws differ in emphasis and detail from those in the United States and issues of land ownership and occupancy are not always clear. Where status of forces agreements (SOFAs) exist, environmental governing standards bridge the gap between U.S. and host nation cultural priorities. In Japan, the Department of Defense Japan Environmental Governing Standards (JEGS) fill this function. Under Criteria 12-4.2 and 12-4.3 of the JEGS, U.S. Forces Japan commit themselves to inventory and protect cultural properties found on the lands they control or use. Cultural properties include archaeological sites, tombs, historic buildings, and shrines. Natural monuments, such as landscape features or plant and animal species, may also be designated as cultural properties. As part of this commitment, in February 1999 a cultural resources inventory was conducted in Area 1, part of Kadena Air Base (AB), Okinawa, Japan. Area 1, the former U.S. army Ammunition Supply Point 1, is currently used primarily for training exercises and recreational paint ball.

  3. STRUKTUR PUNDEN BERUNDAK GUNUNG PADANG DAN ADAPTASI LINGKUNGAN Structure of Gunung Padang Stone Terrace and Enviromental Adaptation

    Directory of Open Access Journals (Sweden)

    Lutfi Yondri

    2016-06-01

    Abstrak Situs Gunung Padang merupakan hasil temuan kembali pada tahun 1979. Sebelumnya temuan ini pernah dicatat oleh N.J. Krom pada tahun 1914. Sejak penemuan kembali pada tahun 1979, berturut-turut telah dilakukan penelitian oleh tim baik dari Direktorat Purbakala, PUSPAN (saat sekarang bernama Pusat Penelitian dan Pengembangan Arkeologi Nasional, Balai Arkeologi Bandung, Pemerintah Daerah, serta berbagai kelompok masyarakat yang mencoba menggali nilai-nilai lain yang terkandung dalam tinggalan tersebut. Dalam tulisan ini dibahas tentang fisik dan pola susun balok-balok batu penyusun struktur punden berundak dengan menerapkan metode deskriptif. Melalui penerapan metode ini diharapkan dapat diuraikan tentang refleksi adaptasi terhadap kondisi lingkungan dari masyarakat pendukung tradisi budaya pengagungan arwah nenek moyang (megalitik yang terjadi pada masa lalu.   Kata kunci: Gunung Padang, budaya megalitik, konstruksi, pola susun, adaptasi

  4. Huon Terrace VIIa2, Papua New Guinea Fossil and Living Coral Isotope (delta 18O) Data for 130,000 years BP to Present

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — Results of analysis of cores collected from 'fossil' massive Porites corals exposed in the raised reefs of the Huon Peninsula, Papua New Guinea (see below for age...

  5. Huon Terrace IIa1, Papua New Guinea Fossil and Living Coral Isotope (delta 18O) Data for 130,000 years BP to Present

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — Results of analysis of cores collected from 'fossil' massive Porites corals exposed in the raised reefs of the Huon Peninsula, Papua New Guinea (see below for age...

  6. Huon Terrace VIIa3, Papua New Guinea Fossil and Living Coral Isotope (delta 18O) Data for 130,000 years BP to Present

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — Results of analysis of cores collected from 'fossil' massive Porites corals exposed in the raised reefs of the Huon Peninsula, Papua New Guinea (see below for age...

  7. Huon Terrace VII1, Papua New Guinea Fossil and Living Coral Isotope (delta 18O) Data for 130,000 years BP to Present

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — Results of analysis of cores collected from 'fossil' massive Porites corals exposed in the raised reefs of the Huon Peninsula, Papua New Guinea (see below for age...

  8. Madang Terrace, Papua New Guinea Fossil and Living Coral Isotope (delta 18O) Data for 130,000 years BP to Present

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — Results of analysis of cores collected from 'fossil' massive Porites corals exposed in the raised reefs of the Huon Peninsula, Papua New Guinea (see below for age...

  9. Huon Terrace V, Papua New Guinea Fossil and Living Coral Isotope (delta 18O) Data for 130,000 years BP to Present

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — Results of analysis of cores collected from 'fossil' massive Porites corals exposed in the raised reefs of the Huon Peninsula, Papua New Guinea (see below for age...

  10. Huon Terrace IIa3, Papua New Guinea Fossil and Living Coral Isotope (delta 18O) Data for 130,000 years BP to Present

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — Results of analysis of cores collected from 'fossil' massive Porites corals exposed in the raised reefs of the Huon Peninsula, Papua New Guinea (see below for age...

  11. Laing Terrace, Papua New Guinea Fossil and Living Coral Isotope (delta 18O) Data for 130,000 years BP to Present

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — Results of analysis of cores collected from 'fossil' massive Porites corals exposed in the raised reefs of the Huon Peninsula, Papua New Guinea (see below for age...

  12. Huon Terrace VII3, Papua New Guinea Fossil and Living Coral Isotope (delta 18O) Data for 130,000 years BP to Present

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — Results of analysis of cores collected from 'fossil' massive Porites corals exposed in the raised reefs of the Huon Peninsula, Papua New Guinea (see below for age...

  13. Huon Terrace VIIa1, Papua New Guinea Fossil and Living Coral Isotope (delta 18O) Data for 130,000 years BP to Present

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — Results of analysis of cores collected from 'fossil' massive Porites corals exposed in the raised reefs of the Huon Peninsula, Papua New Guinea (see below for age...

  14. Huon Terrace IIa2, Papua New Guinea Fossil and Living Coral Isotope (delta 18O) Data for 130,000 years BP to Present

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — Results of analysis of cores collected from 'fossil' massive Porites corals exposed in the raised reefs of the Huon Peninsula, Papua New Guinea (see below for age...

  15. Huon Terrace IIIb, Papua New Guinea Fossil and Living Coral Isotope (delta 18O) Data for 130,000 years BP to Present

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — Results of analysis of cores collected from 'fossil' massive Porites corals exposed in the raised reefs of the Huon Peninsula, Papua New Guinea (see below for age...

  16. Huon Terrace I, Papua New Guinea Fossil and Living Coral Isotope (delta 18O) Data for 130,000 years BP to Present

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — Results of analysis of cores collected from 'fossil' massive Porites corals exposed in the raised reefs of the Huon Peninsula, Papua New Guinea (see below for age...

  17. Assessment of recent tectonic activity on the NW Iberian Atlantic Margin by means of geomorphic indices and field studies of the Lower Miño River terraces

    NARCIS (Netherlands)

    Viveen, W.; van Balen, R.T.; Schoorl, J.M.; Veldkamp, A.; Temme, A.J.A.M.; Vidal-Romani, J.R.

    2012-01-01

    Until recently, NW Iberia was assumed to be tectonically quiescent (stable). However, a combination of tectono-morphological analyses demonstrates that neotectonic movements do occur, which are in agreement with recent findings by other workers. We use a DEM-based tectono-geomorphic approach in

  18. Simple energy conservation. Mid-terrace houses. Modernisation recommendations for homeowners and house buyers; Einfach Energie sparen. Reihenmittelhaeuser. Modernisierungsempfehlungen fuer Hauseigentuemer und Hauskaeufer

    Energy Technology Data Exchange (ETDEWEB)

    Meyer, Ronny

    2012-07-01

    The book under consideration provides a type-specific and construction year-specific orientation to building substances, insulation thicknesses and building services. It is addressed to persons planning an energetic retrofitting of houses. The book contains information on special features and weaknesses of each building as well as appropriate proposals for energy efficiency. It also presents energy assessments and recommendations as a basis for assessing the results of the energy consulting.

  19. Huon Terrace VII2, Papua New Guinea Fossil and Living Coral Isotope (delta 18O) Data for 130,000 years BP to Present

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — Results of analysis of cores collected from 'fossil' massive Porites corals exposed in the raised reefs of the Huon Peninsula, Papua New Guinea (see below for age...

  20. Archaeological Investigations of the San Antonio Terrace, Vandenberg Air Force Base, California, in Connection with MX Facilities Construction. Appendix I. Ethnohistoric Background.

    Science.gov (United States)

    1984-01-01

    Volume 1: Food Procurement and Transportation. Ballena Press Anthropology Papers No. 25, Los Altos. Hudson, D. Travis, Thomas Blackburn, Curletti and...of California by Pedro Fages, 1775. Ballena Press. Ramona. Ruth, Clarence 1936 Research Among the Ancient Chumash Village Sites of Northwestern Santa

  1. Geochemical evidence for African dust and volcanic ash inputs to terra rossa soils on carbonate reef terraces, northern Jamaica, West Indies

    Science.gov (United States)

    Muhs, D.R.; Budahn, J.R.

    2009-01-01

    The origin of red or reddish-brown, clay-rich, "terra rossa" soils on limestone has been debated for decades. A traditional qualitative explanation for their formation has been the accumulation of insoluble residues as the limestone is progressively dissolved over time. However, this mode of formation often requires unrealistic or impossible amounts of carbonate dissolution. Therefore, where this mechanism is not viable and where local fluvial or colluvial inputs can be ruled out, an external source or sources must be involved in soil formation. On the north coast of the Caribbean island of Jamaica, we studied a sequence of terra rossa soils developed on emergent limestones thought to be of Quaternary age. The soils become progressively thicker, redder, more Fe- and Al-rich and Si-poor with elevation. Furthermore, although kaolinite is found in all the soils, the highest and oldest soils also contain boehmite. Major and trace element geochemistry shows that the host limestones and local igneous rocks are not likely source materials for the soils. Other trace elements, including the rare earth elements (REE), show that tephra from Central American volcanoes is not a likely source either. However, trace element geochemistry shows that airborne dust from Africa plus tephra from the Lesser Antilles island arc are possible source materials for the clay-rich soils. A third, as yet unidentified, source may also contribute to the soils. We hypothesize that older, more chemically mature Jamaican bauxites may have had a similar origin. The results add to the growing body of evidence of the importance of multiple parent materials, including far-traveled dust, to soil genesis.

  2. Archaeological Investigations on the San Antonio Terrace, Vandenberg Air Force Base, California, in Connection with MX Facilities Construction. Appendix II. Historical Overview of the Study Area.

    Science.gov (United States)

    1984-01-01

    biography frequently appeared In the county histories and "mug books" whereas neither a biography of Lewis T. nor Benjamin Burton would be found. Ben...Huyck Local Historian Marshall, E.J., II Resident of Jesus Maria Martens, Ray Union Oil Area Land Manager (telephonic) Myrick, David Southern Pacific...the Board of Supervisors of the Coun.ty of SArIa Barbara, State of California. this 2ist day ot November. 195, by tne tocw.o-4g V ayes. C. W. Bradbury

  3. Research on the Relationship between Landslide of Farming Terraces and the Intensity of Rainfall and Slope Angle Based on the Indoor Rainfall Slide Slope Model

    Directory of Open Access Journals (Sweden)

    Dongqin Chen

    2016-03-01

    Full Text Available Due to the increase of geographical disaster in China, it is necessary to study the formation mechanism to make a preparation for the future prevention of geological disasters and effectively reduce the unnecessary financial loss and casualties. We found there is a powerful connection between heavy rainfall and landslide slope. Thus, this article takes the accumulation of gravel soil as the research material to set up indoor rainfall and landslide model test. By comparing the rules of pore water pressure and soil pressure responding to different rainfall intensity and slope angle, we discussed over the effects of rainfall intensity and slope angle on the sliding of accumulation gravelly soil.

  4. The terrace like feature in the mid-continental slope region off Trivandrum and a plausible model for India-Madagascar juxtaposition in immediate pre-drift scenario

    Digital Repository Service at National Institute of Oceanography (India)

    Yatheesh, V.; Bhattacharya, G.C.; Mahender, K.

    & Ocean Research, Headland Sada, Vasco-da-Gama, Goa ? 403 804. 2Geological Oceanography Division, National Institute of Oceanography, Dona Paula, Goa ? 403 004. 3Department of Earth Science, Goa University, Taleigao Plateau, Goa ? 403 206. Abstract... Trivandrum and a plausible model for India?Madagascar juxtaposition in immediate pre-drift scenario, Gondwana Research, Volume 10, Issues 1-2, Pages179-185. 2 1. Introduction The continental shelf of west coast of India (Fig. 1), limited by the 200...

  5. Assessment of undiscovered oil and gas resources of the southern Siberian craton (Baykit High, Nepa--Botuoba High, Angara--Lena Terrace, and Cis--Patom Foredeep Provinces), Russia, 2011

    Science.gov (United States)

    Klett, T.R.; Schenk, Christopher J.; Wandrey, Craig J.; Charpentier, Ronald R.; Brownfield, Michael E.; Pitman, Janet K.; Pollastro, Richard M.; Cook, Troy A.; Tennyson, Marilyn E.

    2012-01-01

    Using a geology-based assessment methodology, the U.S. Geological Survey estimated volumes of undiscovered, technically recoverable, conventional petroleum resources for the southern Siberian craton provinces of Russia. The mean volumes were estimated at 3.0 billion barrels of crude oil, 63.3 trillion cubic feet of natural gas, and 1.2 billion barrels of natural gas liquids.

  6. GEO-ARKEOLOGI TERAS PURBA BENGAWAN SOLO DI SEKITAR KABUPATEN BOJONEGORO, JAWA TIMUR The Geo-archaeology of Ancient Terrace of Bengawan Solo in Bojonegoro Surrounding Regency, East Java

    Directory of Open Access Journals (Sweden)

    Johan Arif

    2016-07-01

    Abstrak Pemetaan teras purba Bengawan Solo merupakan kajian geo-arkeologi tahap awal yang dilakukan di beberapa lokasi di wilayah kabupaten Bojonegoro, Jawa Timur. Permasalahannya adalah ditemukannya indikasi keberadaan peralatan batu paleolitik dan fosil-fosil vertebrata di beberapa teras purba di wilayah ini. Oleh karena itu, tujuan dari kegiatan ini adalah mendapatkan gambaran sebaran teras purba Bengawan Solo berumur Kuarter serta memberikan usulan kepada para ahli arkeologi dalam merancang kegiatan pencarian sisa-sisa budaya manusia antara lain peralatan batu paleolitik maupun sisa-sisa fosil rangka manusia dan hewan pada suatu teras purba. Metode yang dipakai di dalam penelitian ini adalah metode pemetaan geologi, deskripsi profil sedimen, pengambilan contoh-contoh sedimen (termasuk fosil hewan untuk keperluan analisa sedimentologi dan analisa kimia. Di daerah penelitian yang terletak di kabupaten Bojonegoro dijumpai tiga teras yaitu Teras Menden (berumur sub-Resen, Jipangulu (berumur Holosen Awal dan Ngandong (berumur Plestosen Atas. Teras Menden dijumpai di Payaman, Teras Jipangulu di Prangi dan Wotangare dan Teras Ngandong dijumpai di Prangi dan di desa Kedung. Berdasarkan bukti stratigrafinya ketiga teras tersebut disusun oleh lapisan pasir ukuran kasar hingga kerikilan di bagian bawah dan berubah menjadi pasir lempungan dan lempung pasiran di bagian atas. Fenomena ini menunjukkan bahwa ketiga teras tersebut dibentuk oleh sungai yang berkelok-kelok yaitu Bengawan Solo purba. Kedudukan masing-masing teras purba di daerah penelitian yang diukur dari Bengawan Solo adalah 2-3 m (Teras Menden, 5-7 m (Teras Jipangulu dan >8 m (Teras Ngandong. Berdasarkan hasil kajian teras purba ini diusulkan agar para ahli arkeologi lebih memfokuskan kepada perlapisan sedimen yang berukuran kasar dalam sistem endapan sungai purba berumur Kuarter untuk mencari sisa-sisa budaya manusia paleolitikum seperti peralatan batu maupun sisa-sisa fosil rangka manusia dan hewan.   Kata Kunci: teras purba, bengawan solo, bojonegoro

  7. Work on the extension of Restaurant No. 1

    CERN Multimedia

    GS Department

    2010-01-01

    The work on the extension of Restaurant No. 1 will start on 12 April 2010. The section of the terrace currently available will be closed from this date onwards and the south terrace (see drawing) will gradually be made available in its place. Worksite for the extension of Restaurant No. 1.  Closure of current terrace on 2 April. Opening of south terrace on 12 April. Opening of second area of terrace at the end of April. Opening of third area of terrace in May.

  8. Sabine National Wildlife Refuge 1999

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — Terracing uses existing bottom sediments to form terraces or ridges at marsh elevation and the intertidal zone is planted with marsh vegetation. This study examined...

  9. Long-term indigenous soil conservation technology in the Chencha area, southern Ethiopia: origin, characteristics, and sustainability.

    Science.gov (United States)

    Engdawork, Assefa; Bork, Hans-Rudolf

    2014-11-01

    The purpose of this study is to examine the origin, development, and characteristics of terraces (kella), plus their potentials and determinants for sustainable use in the Chencha-Dorze Belle area of southern Ethiopia. Field surveys were conducted to determine the various parameters of the indigenous terraces and in order to collect samples for radiocarbon dating. To identify farmers' views of the terrace systems, semi-structured interviews and group discussions were also carried out. Terraces were built and used-as radiocarbon dating proves-at least over the last 800 years. The long-term continued usage of the indigenous terraces is the result of social commitments, the structural features of the terraces, and the farmers' responses to the dynamics of social and cultural circumstances. We dubbed that the terraces are a success story of fruitful environmental management over generations. Thus, a strong need is to preserve and develop this important cultural heritage and example of sustainable land use.

  10. Paleosol charcoal : Reconstructing vegetation history in relation to agro−pastoral activities since the Neolithic. A case study in the Eastern French Pyrenees.

    OpenAIRE

    Bal, Marie; Rendu, Christine; Ruas, Marie-Pierre; Campmajo, Pierre

    2010-01-01

    International audience; This article uses a method that combines pedoanthracological and pedo-archaeological approaches to terraces, complemented with archaeological pastoral data, in order to reconstruct the history of ancient agricultural terraces on a slope of the Enveitg Mountain in the French Pyrenees. Four excavations revealed two stages of terrace construction that have been linked with vegetation dynamics, which had been established by analyses of charcoal from the paleosols and soils...

  11. Ant diversity and its relationship with vegetation and soil factors in an alluvial fan of the Tehuacán Valley, Mexico

    Science.gov (United States)

    Ríos-Casanova, Leticia; Valiente-Banuet, Alfonso; Rico-Gray, Víctor

    2006-05-01

    In this study, we analyze the ant community found along an alluvial fan located in the Tehuacán Valley, central Mexico. Considering that this fan is composed of four terraces with different soils and vegetation structures, our main goal was to determine whether there are significant differences in ant diversity among terraces. To accomplish this goal, we determine species richness and abundance in order to calculate diversity and evenness indices. In addition, we classify species in different feeding guilds to evaluate whether differences among terraces exist. We expected higher ant diversity and variety of food guilds in terraces with sandy soils and complex vegetation structures than in terraces with argillic and calcic horizons. Correlations between several diversity parameters, and soil percent-sand and vegetation structure were also conducted. A total of 26 ant species were recorded along the fan. Species richness was not different among terraces whereas abundance was higher in sandy soils and on terraces with complex vegetation structure. Particularly, the abundance of the harvester ant Pogonomyrmex barbatus was higher in these terraces decreasing total ant diversity and evenness. Species richness within feeding guilds was similar among terraces with the generalized foragers as the most common. Our work suggests that percentage of sand in the soil and complexity of vegetation structure of the alluvial fan studied might be influencing ant distribution and favoring the abundance of numerically dominant species which could be affecting the diversity patterns of the whole community.

  12. Effects of soil and water conservation on crop productivity: Evidences from Anjenie watershed, Ethiopia

    Science.gov (United States)

    Adgo, Enyew; Teshome, Akalu

    2014-05-01

    Widespread soil and water conservation activities have been implemented in many parts of eastern Africa to control soil erosion by water and improve land productivity for the last few decades. Following the 1974 severe drought, soil and water conservation became more important to Ethiopia and the approach shifted to watershed based land management initiatives since the 1980s. To capture long-term impacts of these initiatives, a study was conducted in Anjenie Watershed of Ethiopia, assessing fanya juu terraces and grass strips constructed in a pilot project in 1984, and which are still functional nearly 30 years later. Data were collected from government records, field observations and questionnaire surveys administered to 60 farmers. Half of the respondents had terraced farms in the watershed former project area (with terrace technology) and the rest were outside the terraced area. The crops assessed were teff, barley and maize. Cost-benefit analyses were used to determine the economic benefits with and without terraces, including gross and net profit values, returns on labour, water productivity and impacts on poverty. The results indicated that soil and water conservation had improved crop productivity. The average yield on terraced fields was 0.95 t ha-1 for teff (control 0.49), 1.86 t ha-1 for barley (control 0.61), and 1.73 t ha-1 for maize (control 0.77). The net benefit was significantly higher on terraced fields, recording US 20.9 (US -112 control) for teff, US 185 (US -41 control) for barley and US -34.5 (US - 101 control) ha-1 yr-1 for maize. The returns on family labour were 2.33 for barley, 1.01 for teff, and 0.739 US per person-day for maize grown on terraced plots, compared to US 0.44, 0.27 and 0.16 per person-day for plots without terraces, respectively. Using a discount rate of 10%, the average net present value (NPV) of barley production with terrace was found to be about US 1542 over a period of 50 years. In addition, the average financial

  13. Geocronología de los yacimientos achelenses de Pinedo y Cien Fanegas (Valle del Tajo) e implicaciones en la evolución fluvial en el entorno de Toledo (España)

    DEFF Research Database (Denmark)

    López-Recio, M.; Silva, P. G.; Roquero, E.

    2015-01-01

    This study presents the first geochronological data from several research projects focused on the chronostratigraphy of the Tagus fluvial terraces in the environs of Toledo city (Central Spain). The research is centered on Middle to Late Pleistocene fluvial terraces with palaeontological and Ache...

  14. Developing innovative sustainable agricultural kits for Nepalese ...

    International Development Research Centre (IDRC) Digital Library (Canada)

    This project will test terrace farming innovations and offer strategies for NGOs to help 100,000 Nepalese entrepreneurs by establishing a start-up company to support product sales. The results may contribute to economic growth in areas of South and Southeast Asia where terrace farmers are prevalent. Partnering to support ...

  15. Tectonic Geomorphology.

    Science.gov (United States)

    Bull, William B.

    1984-01-01

    Summarizes representative quantitative tectonic-geomorphology studies made during the last century, focusing on fault-bounded mountain-front escarpments, marine terraces, and alluvial geomorphic surfaces (considering stream terraces, piedmont fault scarps, and soils chronosequences). Also suggests where tectonic-geomorphology courses may best fit…

  16. Spectral reflectance and soil morphology characteristics of Santa Rita Experimental Range soils

    Science.gov (United States)

    A. Karim Batchily; Donald F. Post; R. B. Bryant; Donald J. Breckenfeld

    2003-01-01

    The Santa Rita Experimental Range (SRER) soils are mostly transported alluvial sediments that occur on the piedmont slope flanking the Santa Rita Mountains in Arizona. The major geomorphic land forms are alluvial fans or fan terraces, but there are also areas of residual soils formed on granite and limestone bedrock, basin floor, stream terraces, and flood plains. The...

  17. 77 FR 53236 - Notice of Permit Applications Received Under the Antarctic Conservation Act of 1978 (Pub. L. 95-541)

    Science.gov (United States)

    2012-08-31

    ... 137-Northwest White Island, ASPA 138-Linnaeus Terrace, and, ASPA 154-Botany Bay to conduct a review of... review, general management and maintenance concerns such as ensuring that all signs and boundary markers... White Island, ASPA 138-Linnaeus Terrace, and, ASPA 154-Botany Bay. Dates August 15, 2012 to August 31...

  18. Profitability of soil erosion control technologies in eastern Uganda ...

    African Journals Online (AJOL)

    For example, for every US$ invested per hectare in terracing and tree planting, there is a return of over US$ 15. However, these returns are likely to be much less if inflation is not regulated. For example, the profits expected from the use of terraces and trees would reduce by about 3 percent if inflation rose to 30 percent.

  19. De geologie, de bodemvorming en de waterstaatkundige ontwikkeling van het Land van Maas en Waal en een gedeelte van het Rijk van Nijmegen

    NARCIS (Netherlands)

    Pons, L.J.

    1957-01-01

    Geology, soil science and the history of water management were surveyed between the rivers Meuse and Waal. Two terrace-shaped sand plains, covered by loamy aeolian sands border the Nymegen ice-pushed ridge. Further west were well formed soils with manganese banks developed in unpushed High Terrace

  20. Landscape controls and vertical variability of soil organic carbon storage in permafrost-affected soils of the Lena River Delta

    DEFF Research Database (Denmark)

    Siewert, Matthias Benjamin; Hugelius, Gustaf; Heim, Birgit

    2016-01-01

    results show that the geomorphological setting explains more soil variability than soil taxonomy classes or vegetation cover. The soils from the oldest, Pleistocene aged, unit of the delta store the highest amount of SOC per m2 followed by the Holocene river terrace. The Pleistocene terrace affected...

  1. Pioneering reconstruction with solar price. The romantic hotel Muottas Muragl; Wegweisender Umbau mit Solarpreis. Das Romantik Hotel Muottas Muragl

    Energy Technology Data Exchange (ETDEWEB)

    Lauster, Marcus

    2012-07-01

    One of the most famous visitor terraces in Switzerland is Muottas Muragl at a height of 2456 m above sea. The Mounting Dining romantic hotel Muottas Muragl was opened in 2010. This hotel is more than just a typical first class extraordinary visitor terrace in the Engadine: It is the first plus energy-hotel in the Alps.

  2. Quantification of surface uplift by using paleo beach deposits (Oman, Northern Indian Ocean)

    Science.gov (United States)

    Hoffmann, Gösta; Schneider, Bastian; Monschau, Martin; Mechernich, Silke

    2017-04-01

    The study focusses on a coastal area along the Arabian Sea in Oman. Here, a staircase of marine terraces is seen as geomorphological evidence suggesting sub-recent uplift of a crustal block in the northeast of the Arabian Peninsula. The erosional terraces are cut into Paleocene to Early Eocene limestone formations. These limestone formations are underlain by allochtonous ophiolites. We mapped the terraces over a distance of 60 km and identified at least 8 terrace levels in elevations up to 350 m above present sea level. The uppermost terraces are erosional, whereas the lower ones are depositional in style. Mollusc and coral remains as well as beach-rock are encountered on the terrace surfaces. The formations are dissected by NW-SE trending faults. Some of the terraces are very pronounced features in the landscape and easy to trace, others are partly eroded and preserved as remnants only. The deposit along the shoreline angle act as a datum making use of the fact that the rocks formed in a defined horizontal level which is the paleo-sea level. Hence, any offset from the primary depositional level is evidence for neotectonic movements. We utilise differential GPS to map the elevation of beachrock deposits. Age constraints on terrace formation is derived by sampling the beachrock deposits and dating using cosmogenic nuclii. The results indicate ongoing uplift in the range of less than a millimetre per year. The uplift is differential as the terraces are tilted. We mapped oblique normal and strike-slip faults in the younger terraces. We hypothesise that the mechanism responsible for the uplift is not tectonics but driven by the serpentinisation of the ophiolite that underlie the limestone formations. One process during the serpentinisation is the hydration of the mantle rocks which is responsible for a decrease in density. The resulting buoyancy and significant solid volume increase lead to the observed deformation including uplift.

  3. Two Late Pleistocene climate-driven incision/aggradation rhythms in the middle Dnieper River basin, west-central Russian Plain

    DEFF Research Database (Denmark)

    Panin, Andrei; Adamiec, Grzegorz; Buylaert, Jan-Pieter

    2017-01-01

    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...

  4. Polyphenols, fungal enzymes, and the fate of organic nitrogen in a Californian pygmy forest

    Science.gov (United States)

    Slessarev, E.

    2011-12-01

    Polyphenols are a diverse family of plant secondary compounds which may influence litter decay and soil nutrient turnover. The "short circuit" hypothesis for polyphenol function proposes that polyphenolic compounds provision plants with nitrogen in nutrient-poor soils by facilitating the accumulation of organic nitrogen in soil humus. By binding peptides, polyphenols may sequester nitrogen in a bank of recalcitrant organic matter, granting competitive advantage to plants with the mycorrhizal fungi most capable of recapturing the tightly bound organic nitrogen. Specifically, fungi may retrieve nitrogen from polyphenol-peptide complexes with an extracellular enzyme, polyphenol oxidase (PPO). In order to evaluate the "short circuit" hypothesis, I measured soil PPO activity during four seasons in the Mendocino "ecological staircase," a soil age-gradient consisting of a series of wave-cut terraces along stretches of the northern California coast. Stunted, pygmy-forest plants growing in the nutrient-poor soils of the older marine terraces produce more polyphenols than their con-specifics on nutrient-rich younger terraces, potentially influencing PPO facilitated nitrogen cycling. I found that PPO activity reached its maximum in the younger terrace forest during the spring, achieving levels nearly twice as high as those observed on the younger terrace in other seasons and in the older terrace forest year-round. In both terraces, PPO activity was greatest in the organic humus at the soil surface, decreasing dramatically in the lower mineral horizon. When PPO activity reached its maximum in the younger terrace, I found that soil polyphenol content positively correlated (Rsq=0.63) with enzyme activity, suggesting that polyphenols might induce enzyme production. However, in the tannin-rich soil of the pygmy forest on the older terrace, enzyme activity remained low, and was most strongly correlated with soil moisture. The results do not support the hypothesis that nutrient

  5. Directory of Open Access Journals (Sweden)

    Rehmat Ullah, Shahid Mahmood Mian,

    2012-05-01

    Full Text Available Soil biological health is one of the best indicators for soil fertility thus plays a significant role in sustainability of cropping systems. This study was designed to investigate the impact of different seasonal variations and cropping systems on soil microbial biomass and enzymatic activities in sloppy arid soils. Soil samples were collected from the sloppy soils (high, medium and low height terraces of Khairimurat areas under wheat (Triticum aestivum–millet (Pennisetum glaucum and wheat (Triticum aestivum–mung bean (Vigna radiate cropping systems. The results revealed that the soil microbial biomass Carbon (Cmic, Nitrogen (Nmic, Phosphorous (Pmic, soil enzymes such as Dehydrogenase (DH and Alkaline Phosphatase (AP activity entirely depends on the soil water availability under both cropping systems at all height terraces. The wheat-mung bean cropping systems stored relatively more Nmic, Pmic, AP (activity and less Cmic, DH (activity as compared to wheat-millet cropping systems. Regarding the slope gradient under both cropping patterns, high height terraces had retained more Cmic contents, medium height terraces had shown more DH activity and low height terraces had maintained more Pmic contents. In addition to this, Nmic contents and AP activity remained almost similar in all types of terraces under both cropping patterns. Pertaining to seasonal variations under both cropping patterns, the summer season had shown more Cmic, Nmic, Pmic, DH and AP activity as compared to spring, winter and autumn season in all types of terraces. The soil water contents increased down to depth in all types of terraces under both cropping patterns. However, soil water contents remained heterogeneous in all types of terraces under both cropping patterns. In conclusion, it is suggested that in arid environments, cover crops be included in cropping system in order to enhance soil biological health.

  6. L'enregistrement géomorphologique de la tectonique quaternaire par les nappes alluviales : l'exemple du bassin de la Têt (Roussillon, France)

    Science.gov (United States)

    Carozza, Jean-Michel; Delcaillau, Bernard

    1999-11-01

    In a low sismo-tectonic activity zone, the geometry of a Quaternary alluvial body can be used as a neotectonic tracer tool. Geometry characteristics of individualized terrace levels are extracted from a Digital Elevation Model by superposing elevation and geological data. The longitudinal profile of each terrace is compared to the best fitting exponential theoretical profile, deduced from hydrodynamic parameters. This analysis, applied to the Têt river terraces (Mediterranean southern France) shows the splitting of a sedimentary body, corresponding to hydrodynamic break interpreted as morphostructural segmentation of the Roussillon basin.

  7. An investigation into the heat consumption in a low-energy building

    Energy Technology Data Exchange (ETDEWEB)

    Wojdyga, K. [The Warsaw University of Technology, 20 Nowowiejska St., 02668 Warsaw (Poland)

    2009-12-15

    The results of five-year study of the heat consumption in a single-storey terraced low-energy residence are presented. The house is part of a forty building Warsaw housing estate Wilanow-Zawady. (author)

  8. Topographic features over the continental shelf off Visakhapatnam

    Digital Repository Service at National Institute of Oceanography (India)

    Rao, T.C.S.; Machado, T.; Murthy, K.S.R.

    water depth and the continental shelfedge several interesting topographic features such as Terraces, Karstic structures associated with pinnacles and troughs and smooth dome shaped reef structures are recorded. The nature of these features...

  9. Tracking Geomorphic Signatures of Watershed Suburbanization with Multi-Temporal LiDAR

    Science.gov (United States)

    Urban development practices redistribute surface materials through filling, grading and terracing, causing drastic changes to the geomorphic organization of the landscape. Many studies document the hydrologic, biologic, or geomorphic consequences of urbanization using space-for-t...

  10. 75 FR 57051 - Notice of Intent To Prepare a Draft Environmental Impact Statement for the Sunset Area Community...

    Science.gov (United States)

    2010-09-17

    .../or green infrastructure. As a result of the Sunset Terrace redevelopment, it is expected that private...) and other local streets, stormwater drainage systems, parks and recreation facilities, ] education... parcels creating significant opportunities for partnership and integration of civil infrastructure...

  11. Upward mass transport and alloying during the growth of Co on Cu(111)

    Science.gov (United States)

    Vu, Quang Huy; Morgenstern, Karina

    2017-03-01

    Co growth on Cu(111) was investigated at several temperatures between 120 K and 300 K by variable-temperature fast-scanning tunneling microscopy at submonolayer coverage. Islands nucleate heterogeneously at step edges and homogeneously on terraces. The height and area distribution difference between these two types of differently nucleated islands is attributed to a step edge alloy. Furthermore, the transformation from one-monolayer high islands to two-monolayer high islands is followed in time-lapsed sequences between 145 and 165 K. A surprising low-energy barrier for upward mass transport of Eupward≈(0.15 ±0.04 ) eV is determined for islands on terraces. At 120 and 150 K, the terrace islands are pure Cu; in contrast, at room temperature, terrace islands larger than ≈120 nm2 alloy at their border.

  12. African Crop Science Journal - Vol 14, No 1 (2006)

    African Journals Online (AJOL)

    Water infiltration, conductivity and runoff under fallow agroforestry on sloping terraces · EMAIL FREE FULL TEXT EMAIL FREE FULL TEXT DOWNLOAD FULL TEXT DOWNLOAD FULL TEXT. D Siriri, MM Tenywa, CK Ong, CR Black, MA Bekunda, 59-71 ...

  13. Evaluation of nekton use and habitat characteristics of restored Louisiana marsh

    Science.gov (United States)

    Thom, C.S.B.; Peyre, M.K.G.L.; Nyman, J.A.

    2004-01-01

    Marsh terracing and coconut fiber mats are two wetland restoration techniques implemented at Sabine National Wildlife Refuge, Louisiana, USA. Using nekton as an indicator of habitat quality, nekton community assemblages were compared between terraced, coconut-matted, unmanaged marsh (restoration goal), and open water (pre-restoration) habitats. Using a throw trap and a 3 m ?? 2 m straight seine, 192 nekton samples were collected over four dates in 2001 and 2002 at all habitats. Nekton abundance was similar at unmanaged marsh (restoration goal), coconut mat, and terrace edge, and significantly higher than at open water (pre-restoration) sites (P nekton use as compared to pre-restoration conditions (open water samples) by providing marsh edge habitat, but failed to support a nekton community similar to unmanaged marsh (restoration goals) or coconut-matted sites. Future restoration projects may evaluate the combined use of coconut mats with terracing projects in order to enhance habitat for benthic dependent nekton.

  14. Baota landslide in the Three Gorges area and its OSL dating

    Science.gov (United States)

    Chen, Jian; Li, Xiao; Yang, Zhifa

    2008-03-01

    Large old landslides are common in the Three Gorges area. Baota landslide, a large rockslide, is one of the largest landslides in the Three Gorges area. In the landslide body there are two terraces to be recognized. The two terrace deposits is not a two-grade terrace, but mainly remnants left by an occurrence of Baota landslide. Optically stimulated luminescence (OSL) dating suggests that the age of the terrace deposits is 38 32 kyr BP. The OSL ages along with other Thermoluminescence (TL) and Radiocarbon (14C) ages support the conclusion that the Baota landslide was originally triggered by strong precipitation occurred in a warm climate period of 30,000 40,000 years BP.

  15. Classification of Inheritance Shop Houses in George Town, Penang - UNESCO World Heritage Site

    National Research Council Canada - National Science Library

    Rozliani Mansor; Md Azree Othuman Mydin; Norazmawati Md Sani @ Abd Rahim; Ruhizal Roosli; Hasnanywati Hassan

    2012-01-01

    Shop house is an urban terrace house attribute of Asian towns from the 18 th century which usually integrates a shop or business premise on the ground floor whilst the family dwells on the upper level...

  16. 76 FR 18573 - Notice of Availability of a Final Environmental Impact Statement for the Sunset Area Community...

    Science.gov (United States)

    2011-04-04

    ... such as a community center, senior center, and/or public library space; a new park/open space; retail shopping and commercial space; and green infrastructure. Sunset Terrace's redevelopment provides the...

  17. Diagenesis of Holocene reef and associated beachrock of certain ...

    Indian Academy of Sciences (India)

    Rameswaram, Kurusadai, Shingle and Appa Island) were studied to assess the diagenetic evidences. Sixty samples were collected from marine terraces and reef platforms. The samples comprised of coral rubbles, shell fragments and lithic fractions.

  18. Alluvial Aquifer

    Data.gov (United States)

    Kansas Data Access and Support Center — This coverage shows the extents of the alluvial aquifers in Kansas. The alluvial aquifers consist of unconsolidated Quaternary alluvium and contiguous terrace...

  19. The impact of informal irrigation practices on soil drainage condition, soil pollution and land suitability for agriculture in El Saf area of El Giza Governorate

    Directory of Open Access Journals (Sweden)

    Hanan E.M. El Azab

    2015-12-01

    Full Text Available The study area was selected in El Saf District of El Giza Governorate in Egypt, covering 21461.4 ha of Nile sediments and their outskirts of alluvial higher and lower terraces. The aim of this study was to assess the impact of informal irrigation practices on drainage deterioration, soil pollution and land suitability for agricultural use using the satellite LDCM data 2013. From the lower alluvial terraces (partly cultivated using wastewater, the drainage flows westward via descending slopes resulting in land deterioration in both the alluvial lower terraces and alluvial plain of River Nile. The drainage conditions are excessively drained soils in the alluvial upper terraces within soils of Typic Haplocalcids, sandy skeletal, but in the lower terraces it partly occurred within soils of Typic Torriorthents, sandy skeletal. Moderately well drained soils occurred in soils of Typic Torriorthents, sandy in the alluvial lower terraces, while in the alluvial plain of Nile sediments are Sodic Haplotorrerts, fine. Poorly drained soils in the lower alluvial terraces have soils of Typic Epiaquents, sandy associated with Sodic Psammaquents and Aquic Haplocalcids, coarse loamy, while in the alluvial plain of River Nile the soils are Halic Epiaquerts, fine. Very poorly drained soils (submerged areas are scattered spots in both the lower alluvial terraces and the alluvial plain. In the alluvial plain of River Nile, 1967.1 ha become not suitable for the traditional cultivated crops, while in the alluvial terraces 3251.0 ha are not suitable for the proposed cultivation of Jojoba plants. Heavy metals of Cadmium (Cd, Cobalt (Co, Lead (Pb and Nickel (Ni were added to the soil surface and sub-surface in the irrigated areas by wastewater in the lower alluvial terraces (moderately well drained soils, but Cd and Co exceeded the standards of permissible total concentrations in these soils. The same metals were added to soil sub-surface layers in the alluvial plain

  20. Beaches and Bluffs of Puget Sound and the Northern Straits

    Science.gov (United States)

    2007-04-01

    all of which shape the health of salmon populations. Puget Sound and the Northern Straits encompass the cen- tral feature in the Puget Lowland...low-tide terrace (Figure 1). Lag deposits derived from bluff recession are often found in the low-tide terrace. Lag deposits are the largest clasts ...Strait of Juan de Fuca, Puget Sound area beaches are shaped by wind-generated waves. Wave energy is controlled by fetch: the open water distance

  1. Installation Restoration Program. Preliminary Assessment for the 188th Tactical Fighter Group, Arkansas Air National Guard, Fort Smith Municipal Airport, Fort Smith, Arkansas.

    Science.gov (United States)

    1988-02-01

    in order from oldest to I youngest (Hendricks and Parks, 1950). These formations are of the Paleozoic Era, Carboniferous System, Pennsylvanian...of the Carboniferous System is the Quaternary System, which consists of stream terraces and alluvium. The stream terraces consist of gravel, sand, silt... CARBONIFEROUS - The Mississippian and Pennsylvanian periods combined, ranging * , from about 345 to 280 millions years ago. , CLAY [soil] - A rock or

  2. Implications for landscape evolution

    Indian Academy of Sciences (India)

    (a) Morphotectonic map of Khari gorge site showing bedrock terraces T1 to T5 and the palaeochannel. T6 is the lowest terrace within the gorge having negligible aerial dimension. Ponds bounded by faults at both ends of the gorge are marked by circles. A–B and C–D are section lines of figure 4. (b) A panoramic view of ...

  3. Insights into Modularity: 753rd Tank Battalion in World War II

    Science.gov (United States)

    2008-03-17

    terraces, covered with olive trees and scrub. The stone retaining walls of these terraces varied in height from three to seven feet. The steps of the...unable to scale the stone retaining wall. At the commander’s direction, a platoon leader further back in the column made several vain attempts to...ancient, fortress-like monastery . For reasons unclear in the records, however, the battalion detached from the 36th ID on January 16, prior to what would

  4. Detailed hydrogeomorphic analysis in the Gerecse Mountains, Hungary

    Directory of Open Access Journals (Sweden)

    Józsa Edina

    2016-12-01

    Full Text Available The northern foreland of the Central Gerecse Mountains is a complex landscape with a moderate relief and the presence of terrace remnants. To explore the hydrogeomorphic settings, the characteristics of the drainage network, several basin metrics, and geomorphometric maps were interpreted, which are the outputs of a semi-automated algorithm. Based on the results, the small catchments of the area were divided into two groups with diverse topographic characteristics and the presence of 7 terrace levels was revealed.

  5. Scanning Tunneling Spectroscopy of Proximity Superconductivity in Epitaxial Multilayer Graphene

    OpenAIRE

    Natterer, Fabian D.; Ha, Jeonghoon; Baek, Hongwoo; Zhang, Duming; Cullen, William; Zhitenev, Nikolai B.; Kuk, Young; Stroscio, Joseph A.

    2016-01-01

    We report on spatial measurements of the superconducting proximity effect in epitaxial graphene induced by a graphene-superconductor interface. Superconducting aluminum films were grown on epitaxial multilayer graphene on SiC. The aluminum films were discontinuous with networks of trenches in the film morphology reaching down to exposed graphene terraces. Scanning tunneling spectra measured on the graphene terraces show a clear decay of the superconducting energy gap with increasing separatio...

  6. An Anvilian (early pleistocene) marine fauna from western Seward Peninsula, Alaska

    Science.gov (United States)

    Hopkins, D.M.; Rowland, R.W.; Echols, R.E.; Valentine, P.C.

    1974-01-01

    Cover sediments of the York Terrace exposed near the California River, western Seward Peninsula, Alaska, yield mollusks, ostracodes, and foraminifera that lived during the Anvilian transgression of early Pleistocene age. The fossiliferous sediments lie at the inner edge of the York Terrace, a deformed wave-cut platform that extends eastward from Bering Strait along much of the southern coast of Seward Peninsula. The seaward margin is truncated by the little-deformed Lost River Terrace, carved during the Pelukian (Sangamonian) transgression. The early Pleistocene sediments seem to have been deposited between the first and second of four glaciations for which evidence can be found in the California River area. The California River fauna includes several extinct species and several species now confined to areas as remote as the northwestern Pacific and north Atlantic. The fauna probably lived in water temperatures much like those of the present time but deeper water on the Bering Shelf is suggested. The presence of an early Pleistocene fauna at the inner edge of the York Terrace at California River shows that the terrace was largely carved before and during early Pleistocene time. However, a marine fauna apparently of middle Pleistocene age is found on the York Terrace near Cassiterite Peak, and this seems to indicate that the terrace remained low until middle Pleistocene time. Uplift of the York Terrace probably was accompanied by uplift of Bering Strait. The strait may have been deeper, and there may have been no land bridge between the Seward Peninsula of Alaksa and the Chukotka Peninsula of Siberia during most of early and middle Pleistocene time. ?? 1974.

  7. Life cycle environmental impacts of different construction wood waste and wood packaging waste processing methods

    OpenAIRE

    Manninen, Kaisa; Judl, Jáchym; Myllymaa, Tuuli

    2016-01-01

    This study compared the life cycle environmental impacts of different wood waste processing methods in three impact categories: climate impact, acidification impacts and eutrophication impacts. The wood waste recovery methods examined were the use of wood waste in terrace boards made out of wood composite which replace impregnated terrace boards, incineration of wood waste in a multi-fuel boiler instead of peat and the use of wood waste in the production of particleboard in either Finland or ...

  8. New 40Ar/39Ar eruption ages for the western Aeolian Arc, Southern Italy

    Science.gov (United States)

    Creamer, J. B.; Calvert, A. T.; Spera, F. J.

    2011-12-01

    New 40Ar/39Ar ages are presented for the western Aeolian Arc, southern Italy which help constrain eruption frequency and revise the local uplift history through bracketing the timing of marine terrace formation. The islands of Alicudi, Filicudi, and Salina are late-Quaternary composite stratovolcanoes which feature basaltic to dacitic calc-alkaline and high-K series lavas and pyroclastics. These islands have been the focus of several geochronologic studies in the past but many open questions remain due to recently revised mapping, conflicting ages, and incomplete coverage of eruptive sequences. On Salina, a single new age constrains the previously undated Corvo volcano to 128.8 +/- 5.3 ka. On Filicudi, three new dates constrain the oldest exposed episodes of volcanism to ~200-205 ka, in good agreement with previous K/Ar ages. The age of an intervening marine terrace is constrained by these oldest units to c. 200 ka. Additionally there is one new date of 80.4 ± 9.4 ka on the youngest effusive eruption on Filicudi, a dacite dome that overlies the youngest marine terrace on the island. On Alicudi, five new dates constrain the oldest exposed units (Paleo Alicudi Synthem) to 167.4 ± 26.1 ka, the Scoglio Galera to Spano synthems between 64.1 ± 4.1 ka and 59.3 ± 1.3 ka, and confirm the youngest eruptions (Fillo dell'Arpa Fm) at 30.0 ± 0.7 ka. Importantly, an undated formation that overlies the 59.3 ka unit is cut by a marine terrace that was previously interpreted to be ~80 ka (MIS 5a highstand). This result calls into question the archipelago-wide age correlation of marine terraces attempted by Lucchi et al. 2008 since the youngest terrace on Alicudi is younger than eruptive units that overly all terraces on Filicudi. Previous work suggesting that marine terraces on Filicudi were formed during Marine Isotope Stages (MIS) 5a,c, and e is permitted by our new ages, but the oldest terrace ('Paleoshoreline B') on Filicudi was possibly formed during MIS 7 rather than MIS

  9. Morphosedimentary and hydrographic features of the northern Argentine margin: The interplay between erosive, depositional and gravitational processes and its conceptual implications

    Science.gov (United States)

    Preu, Benedict; Hernández-Molina, F. Javier; Violante, Roberto; Piola, Alberto R.; Paterlini, C. Marcelo; Schwenk, Tilmann; Voigt, Ines; Krastel, Sebastian; Spiess, Volkhard

    2013-05-01

    Bottom currents and their margin-shaping character became a central aspect in the research field of sediment dynamics and paleoceanography during the last decades due to their potential to form large contourite depositional systems (CDS), consisting of both erosive and depositional features. A major CDS at the northern Argentine continental margin was studied off the Rio de la Plata River by means of seismo- and hydro-acoustic methods including conventional and high-resolution seismic, parametric echosounder and single and swath bathymetry. Additionally, hydrographic data were considered allowing jointly interpretation of morphosedimentary features and the oceanographic framework, which is dominated by the presence of the dynamic and highly variable Brazil-Malvinas Confluence. We focus on three regional contouritic terraces identified on the slope in the vicinity of the Mar del Plata Canyon. The shallowest one, the La Plata Terrace (˜500 m), is located at the Brazil Current/Antarctic Intermediate Water interface characterized by its deep and distinct thermocline. In ˜1200 m water depth the Ewing Terrace correlates with the Antarctic Intermediate Water/Upper Circumpolar Deep Water interface. At the foot of the slope in ˜3500 m the Necochea Terrace marks the transition between Lower Circumpolar Deep Water and Antarctic Bottom Water during glacial times. Based on these correlations, a comprehensive conceptual model is proposed, in which the onset and evolution of contourite terraces is controlled by short- and long-term variations of water mass interfaces. We suggest that the terrace genesis is strongly connected to the turbulent current pattern typical for water mass interfaces. Furthermore, the erosive processes necessary for terrace formation are probably enhanced due to internal waves, which are generated along strong density gradients typical for water mass interfaces. The terraces widen through time due to locally focused, partly helical currents along the

  10. Lithofacies analysis of the valley fill deposits along the Teesta river in Lesser Himalaya of Sikkim and Darjeeling: a climatic response

    Science.gov (United States)

    Lukram, I. M.

    2008-12-01

    Lithofacies analysis of the terraces, fan lobes, floodplain and channel bar deposits along the Teesta river in a stretch of the Sikkim-Darjeeling Himalaya was carried out. Four major types of deposits- Debris flow, Hyperconcentrated flow, Normal channel flow and Sheet flow deposits - were identified. Debris flows are represented by mostly poorly sorted, weakly imbricated to disorganized matrix supported pebble to boulder gravels with silty sand. Hyperconcentrated flow deposits consist of clast-supported, poorly sorted polymodal gravel facies with poorly developed imbricated fabric, and generally occupy the lower parts of the terrace and fan sequences. The channel flow deposits constitute relatively well sorted, well imbricated and clast- supported gravels with coarse to medium sand matrix. Sheet flow deposits are characterized by clast supported well imbricated and horizontally bedded deposits, which were formed by high-velocity shallow flows as gravel bars without avalanche faces. Sub-facies units are classified into clast supported gravels, matrix supported gravels, granule facies, sandy facies, and palaeosol. Hyperconcentrated flow deposits and debris flow deposits are mainly present in the terrace T2 and fanlobe F2. Normal channel flow deposits belong to braided channel facies and are mainly present in the terrace T3 and T1. Terrace T1 also shows presence of sheet flow and hyperconcentrated flow units in its upper part. Granule facies deposited from the hyperconcentrated flow are present in the terrace T3 at Rangpo, Tumlang Khola and Kalijhora. In the middle part of fanlobe F1, both normal channel flow and hyperconcentrated flow deposits are present. The paleaosols are present at the upper units of the terrace T2 and fanlobe F2 in few places having a thickness of about 1 m. The colour of these palaeosol units vary from blackish to dark grayish and these are rich in humus as indicated by their high (2.3 to 6.1 %) carbon content. The C14 dates of the four

  11. Large cutting tools in the Danjiangkou Reservoir Region, central China.

    Science.gov (United States)

    Kuman, Kathleen; Li, Chaorong; Li, Hao

    2014-11-01

    Handaxe-bearing sites in China are currently known to occur in a number of alluvial basins, the best known being Dingcun, Bose and Luonan. Bose in the south and Luonan in central China on the northern margin of the Qinling Mountains are most familiar to English-speaking researchers. Here we document the Danjiangkou Reservoir Region (DRR) as another major area for large cutting tools (LCTs), located in central China on the southeastern edge of the Qinling Mountains. Large cutting tools are preserved in three terraces of the Han and Dan Rivers in Hubei and Henan Provinces, with dates from ca. 0.8 Ma (millions of years ago) (Terrace 4) to the first half of the Middle Pleistocene (Terrace 3), and possibly to the Late Pleistocene (Terrace 2). This paper reports on LCTs discovered in Terraces 3 and 2, with a majority from the older terrace (and one specimen from Terrace 4). Regional environments during the Middle Pleistocene were relatively warm, humid and stable. Despite the poor quality of raw materials (predominantly quartz phyllite and trachyte for the LCTs), good examples of both handaxes and cleavers are present, plus two types of picks. The LCT technology is compared and contrasted with other Asian industries and with the Acheulean. Overall the DRR LCTs show both technological and morphological similarities with Acheulean LCTs, with some differences that are mainly attributed to raw material properties, subsistence ecology, and 'cultural drift.' The DRR LCTs expand the range of morphological variability of the East Asian material and highlight the need for greater reliance on technological analysis and raw material evaluation for best comparison of Chinese assemblages with the Acheulean tradition. Copyright © 2014 Elsevier Ltd. All rights reserved.

  12. Morphotectonic records of neotectonic activity in the vicinity of North Almora Thrust Zone, Central Kumaun Himalaya

    Science.gov (United States)

    Kothyari, Girish Ch; Kandregula, Raj Sunil; Luirei, Khayingshing

    2017-05-01

    The landform development and valley floor morphology of active regions is significantly controlled by tectonic processes. In the present study the upper catchments of Kosi and Gagas river valleys have been investigated with special emphasis on aggradational landforms to explain the spatial and temporal variability of aggradation/incision in response to tectonic activity during the late Quaternary and Holocene in Central Kumaun Himalaya. Major tectonic elements such as the North Almora thrust (NAT), Rasiyari fault (RF), and Gagas fault (GF) are considered to be controlling the development of landforms in the region. The valleys have preserved debris flow terraces, bedrock strath terraces, and fluviolacustrine terraces that provide signatures of tectonic activity. Morphostratigraphy of the terraces reveals that the oldest landforms are preserved in the hanging wall block of the NAT, RF, and along the GF. Reconstructions based on morphostratigraphy through the application of optical chronology suggests multiple phases of fluvial aggradation in the upper catchment of the Kosi and Gagas rivers that were initiated around 34 ka. The youngest phase of aggradation is dated to be around early to mid-Holocene (7-1 ka). Based on terrace morphology, four major phases of enhanced uplift have been estimated during 34, 15.8, 7, and 3 ka. The older uplift event dated to be around 34 ka is represented uplift along GF, which accommodated onset of valley-fill aggradation in Gagas valley. The 15.8 ka event represents uplift along RF, which led to the generation of debris flow from adjacent hillslopes. The 7 ka event represents uplift of a hanging wall block of the NAT and deposition of debris flow terraces. However, the youngest 3 ka event represents enhanced uplift, which is responsible for the incision of the older valley fill sediments and bedrock. Following this, a phase of accelerated incision/erosion owing to an increase in uplift rate occurred, as evident from the strath

  13. Volcano Flank Structures on Earth and Mars

    Science.gov (United States)

    van Wyk de Vries, B.; Byrne, P. K.; Mathieu, L.; Murray, J. B.; Troll, V. R.

    2007-12-01

    Shield volcanoes on Earth and Mars share common features, including calderas and pit crater chains. A set of structures present on the sides of several of the large shields on Mars are not regarded as having Earth analogues, however. Flank terraces are topographically subtle structures, characterised by a gentle convex profile and a distinctive "fish scale" imbricate distribution pattern. Magma chamber inflation, lithospheric flexure, flank relaxation, or gravitational slumping have been suggested as terrace formation mechanisms. Terraces on both Mars and Earth are clearly visible only in slope maps, and may thus escape visual detection in the field. We show that both Mauna Loa (Hawaii) and Etna (Sicily) display the same characteristic "fish scale" terrace pattern. This pattern delineates structures that we contend are terrestrial flank terraces. Heterogeneities in volcano geometry, due to buttressing or extension, result in terrace distributions that are not as evenly circumferential as those on Mars. Plan and cross-sectional profiles, however, parallel those of the Martian structures. These structures may also be present on Alayta (Ethiopia), Santa Cruz (Galapagos), and Tendürek Dagi (Turkey). Another type of structure, larger and steeper than flank terraces but sharing a similar plan-view morphology, is also present on Mauna Lau and Etna. These "flank bulges" appear to correlate with structures on Piton de la Fournaise (La Réunion), Cosiguina (Nicaragua), and Karthala (Comoros) on Earth, and Apollinaris Patera and Tharsis Tholus on Mars. Elsewhere (Paul K. Byrne et al., this volume) we argue that lithospheric flexure is a likely formation mechanism for Martian terraces. Flexure is active beneath Mauna Loa, and possibly under Etna, and so may also be responsible for terrestrial flank terraces. Scaled analogue models suggest that the larger flank bulges are due to magma intrusions derived from large chambers within these edifices. There is thus a strong

  14. A Conservation Approach of Globally Important Agricultural Heritage Systems (GIAHS: Improving Traditional Agricultural Patterns and Promoting Scale-Production

    Directory of Open Access Journals (Sweden)

    Yongxun Zhang

    2017-02-01

    Full Text Available Heritage conservation is an important recurring research theme on agricultural heritage systems. Improving the income of farmers from agriculture is regarded as an effective conservation approach. This study examined how the improved rice-fish-duck coculture (IRFDC promotes the protection of the Honghe Hani Rice Terraced System (HHRTS by keeping farmers farming in their hometowns. A semi-structural interview and a questionnaire survey were used to collect data on agricultural input–outputs and household employment in HHRTS. As a result, a fairly large proportion of HHRTS rice terraces were used for the hybrid rice monoculture (HRM with chemical inputs, and most of these rice terraces were wasted for half a year on account of being left unused; the IRFDC requires considerable time input for farming and breeding, but barely needs any chemical inputs. IRFDC entails a higher cost than HRM, but also has a higher return than HRM. Driving a family to do full-time farming requires extra more than 0.71 ha rice terraces for IRFDC. In conclusion, Globally Important Agricultural Heritage Systems (GIAHSs can be used for protecting terraces from abandonment and destruction by improving agricultural economic benefits for farmers. At present, a shortage of laborers in HHRTS sites is false. Agricultural heritage sites do not actual need so many people if peasant households can do large-scale farming.

  15. The mystery of Bunge Land (New Siberian Archipelago): implications for its formation based on palaeoenvironmental records, geomorphology, and remote sensing

    Science.gov (United States)

    Schirrmeister, Lutz; Grosse, Guido; Kunitsky, Viktor V.; Fuchs, Margret C.; Krbetschek, Matthias; Andreev, Andrei A.; Herzschuh, Ulrike; Babyi, Olga; Siegert, Christine; Meyer, Hanno; Derevyagin, Alexander Y.; Wetterich, Sebastian

    2010-12-01

    Multiproxy datasets (geocryology, geochronology, sedimentology, palaeo-ecology) from permafrost exposures were used together with land surface information based on satellite imagery and thematic maps in order to reconstruct the Lateglacial to Holocene landscape and environmental dynamics of Bunge Land (Zemlya Bunge). This area of little relief, situated in the New Siberian Archipelago, connects the geomorphologically well-structured islands of Kotel'ny and Fadeevsky. A buried thermokarst landscape was found in the northwest region of the Bunge Land low terrace sand plain, whereas the Bunge Land high terrace seems to be an exposed residue of a similar late Quaternary thermokarst landscape. That is confirmed especially by radiocarbon accelerator mass spectrometry and optically stimulated luminescence age determinations, and by pollen analyses. Palaeogeographically, the late Pleistocene periglacial landscape and sedimentation of Bunge Land was closely connected to Kotel'ny and Fadeevsky; only later on seismotectonical block movements resulted in reshaping parts of Bunge Land. The Bunge Land low terrace area first subsided and the original landscape there was destroyed by marine inundation, followed by marine sedimentation. Subsequent block heave of the low terrace region exposed a vast sheet of marine sands which is continuously surficially reworked by aeolian processes, while the original alluvial plain landscape in the high terrace area was preserved and started degrading only by early Holocene thermokarst development. The studied exposures contain one of the northernmost (74.88°N) environmental records for the late Pleistocene-Holocene transition in the Eurasian Arctic.

  16. Effort to Increase Oil Palm Production through Application Technique of Soil and Water Conservation

    Directory of Open Access Journals (Sweden)

    Kukuh Murtilaksono

    2009-05-01

    Full Text Available The study was carried out at block 375, 415, and 414 (block 1, 2, and 3 Afdeling III, Mangement Unit of Rejosari, PT Perkebunan Nusantara VII, Lampung from June 2005 until December 2007. Objective of the study is to examine the effect of soil and water conservation measurement, namely bund terrace and silt pit that are combined with retarded-water hole on production of oil palm. Sampled trees of each block were randomly selected as much as 36 trees. Parameters of vegetative growth (additional new frond, total of frond, number of new bunch, production (number of bunch, fresh fruit bunch (TBS, and average of bunch weigh (RBT were observed and recorded every two weeks. Production of palm oil of each block was also recorded every harvesting schedule of Afdeling. Tabular data were analyzed descriptively by logical comparison among the blocks as result of application of bund terrace and silt pit. Although the data of sampled trees were erratic, bund terrace and silt pit generally increasing number of frond, number of bunch, average of bunch weight, and fresh fruit bunch. Bund terrace gived the highest production of TBS (25.2 t ha-1 compared to silt pit application (23.6 t ha-1, and it has better effect on TBS than block control (20.8 t ha-1. Aside from that, RBT is the highest (21 kg at bund terrace block compared to silt pit block (20 kg and control block (19 kg.

  17. Measurement of the Vertical Distribution of Reflected Solar Radiation

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    Tetsu Aoki

    2015-05-01

    Full Text Available The purpose of this study was to develop a devicefor measuring the vertical distribution of the reflected radiation to the inside of a room from terrace to building.The proposed device is attached to aluminum plates that are painted matte black at intervals of 20 cm on polystyrene insulation. The surface temperature of the aluminum plate, called the SAT (sol-air temperature, is used as an indicator of the quantity of solar radiation. In order to compare terrace materials, two of the measuring devices were located facing south.Concrete tile, artificial turf, and wood chips were selected as materials to be comparedfor the surface of the terrace and were laid in front of the measuring devices. The results indicate that the SAT reflected onto a vertical plane was higher closer to the ground for all materials. Hourly fluctuations of the vertical distribution of the reflected solar radiation differed, depending on the terrace surface material. When concrete tiles of different thicknesses were compared, the temporal heating patterns varied due to differences in heat capacity. These results lead us to the conclusion that using the developed measuringdevice enables grasping the effect of vertical distribution of reflected solar radiation from a terrace.

  18. Geo morphological setting and main technological features of new Middle and Upper Pleistocene sites in the Lower Manzanares River Valley (Madrid, Spain); Contexto geomorfologico y principales rasgos tecnologicos de nuevos yacimientos del Pleistoceno Medio y Superior en el Valle Inferior del Manzanares (Madrid, Espana)

    Energy Technology Data Exchange (ETDEWEB)

    Silva, P. G.; Lopez Recio, M.; Cuartero, F.; Baena, J.; Tapias, F.; Manzano, I.; Martin, D.; Morin, J.; Roquero, E.

    2012-11-01

    The archaeological works developed during the years 1996 in the site of Tafesa, 2005 in the 12 de Octubre Metro Station site and 2006 in the confluence of the Butarque Stream (Villaverde-Barrio de Butarque site) located south of the Madrid City (Spain), have provided new lithic assemblages. These assemblages have been stratigraphic ally contextualized in the Pleistocene deposits of the Lower Manzanares river valley within the so-called Manzanares Complex Terrace (TCMZ). This fluvial terrace constitutes an anomalous thickened (20-15m) deposit at {+-}22-16m above the present river thalweg mainly developed along the right (southern) valley margin. This fluvial level has been traditionally considered of middle Pleistocene age on the basis of the acheulian lithics and faunal assemblages typically located within its lower stratigraphic layers. Certainly, the Tafesa is a fluvial terrace site at {+-}22 m with acheulian industry and middle Pleistocene faunal remains at its lower sedimentary sequence. However, the upper sedimentary levels of this same terrace in the 12 de Octubre y Villaverde-Butarque sites throw lithic assemblages of the lower and upper Paleolithic belonging to upper Pleistocene, as suggested by the available set of TL and OSL dates for the zone. The analyses developed in this study indicate that the development of this thickened fluvial terrace started during the end of the middle Pleistocene, but also comprise the whole Oxygen Isotopic Stage OIS 5 during the upper Pleistocene. (Author) 95 refs.

  19. Raised marine sequences of Lanzarote and Fuerteventura revisited—a reappraisal of relative sea-level changes and vertical movements in the eastern Canary Islands during the Quaternary

    Science.gov (United States)

    Zazo, Cari; Goy, José Luis; Hillaire-Marcel, Claude; Gillot, Pierre-Yves; Soler, Vicente; González, José Ángel; Dabrio, Cristino J.; Ghaleb, Bassam

    2002-10-01

    Systematic mapping and morphosedimentary analysis of Fuerteventura and Lanzarote Islands supported by laboratory techniques (U-series mostly by TIMS, 14C analysis and allo-isoleucine measurements on biogenic carbonates from raised marine deposits, paleomagnetic and a few K/Ar measurements on volcanic formations related to marine deposits) provide a basis for constraining the age of Late Cainozoic marine units. The most complete sequences of raised marine terraces are found at similar elevations in both islands. They include up to 12 marine terraces (Episodes) at elevations between 0 m and 70 m above mean sea level (asl). At least six terraces should be of Quaternary age, and more recent than 1.2 Myr. Throughout the whole marine sequence with the exception of the Holocene terrace, the warm fauna assemblage is characterized by the presence of Ostrea virleti, Nerita emiliana, and Strombus ( S. cf. coronatus-S. cf. bubonius). However, there is a major change, highlighted by the disappearance of the first two species, below the 8-10 m terrace, that could possibly correspond to MIS 11. K-Ar measurements allow an estimate for mean uplift rate of 1.7 cm/ka during the last million years. The present elevation of the Last Interglacial deposits (about 1 and 2 m asl) shows discontinuous vertical movements with possibly a reverse trend since MIS 9 in eastern Canary Islands.

  20. Survey of Barley and Wheat Diseases in the Central Highlands of Eritrea

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    A.H. Yahyaoui

    2004-04-01

    Full Text Available Annual surveys of barley and wheat diseases were conducted in Eritrea from 2000 to 2002. The surveys covered six zones of the central highlands where barley and wheat are grown. The main diseases of barley were netform net blotch, spot-form net blotch, leaf rust and scald. Other, less important diseases were loose smut, covered smut, barley stripe and septoria leaf blotch. Wheat was mainly affected by yellow rust and leaf rust. Loose smut, septoria leaf spot and tan spot diseases were less prevalent. The average incidence of these diseases varied according to the zone. Among barley diseases, net blotch incidence was high in four of the six zones surveyed. Leaf rust occurred at medium incidence in five zones. Loose smut was more severe in the southern highland plains, while covered smut was more common in the south-eastern highland terraces. For wheat, yellow rust incidence was high in two zones. Areas with a high incidence of yellow rust were not necessarily those with a high incidence of leaf rust. Leaf rust was important in the south-eastern and western highland terraces and in the western highland plains. The number of diseases found in the same field varied from 2 to 5. The south eastern highland terraces, the western highland terraces and the northern highland terraces had the highest proportions of individual barley fields with three or more diseases.

  1. Impact of land use change on soil carbon loss of the Sikkim Himalayan piedmont

    Science.gov (United States)

    Prokop, Pawel; Ploskonka, Dominik

    2014-05-01

    Natural and human causes of change in land use on soil carbon were studied at the outlet of the Tista River from the Sikkim Himalayas over the last 150 years. Analysis of topographic maps and satellite images indicates that the land reforms related to location of tea gardens in the piedmont caused rapid deforestation of terraces in the late 19th century. Continuous population growth after 1930 initiated the replacement of floodplain forest by rice cultivation. Both processes changed soil carbon content and intensified fluvial activity expressed through terrace erosion. The replacement of natural forest by tea cultivation reduced the soil carbon content within terraces from 1.95 kg to 1.77 kg (in 1 m of topsoil) respectively. The replacement of natural forest by rice reduced the soil carbon content within floodplains from 0.42 kg to 0.23 kg (in 1 m topsoil) respectively. Much more dangerous, was terrace erosion leading to permanent removal of sediment including soil. The total loss of soil carbon in a 1 m thick soil layer due to conversion of 5 km2 forest to tea cultivation was about 900 t between 1930 and 2010. While the total soil carbon removed due to 1.8 km2 terrace erosion reached 3510 t in the same period. Result is the outcome of research project 2012/05/B/ST10/00309 of the National Science Centre (Poland).

  2. Preliminary Results of Tectonic Geomorphology Investigation of the Northern Cyprus coasts

    Science.gov (United States)

    Yildirim, Cengiz; Tüysüz, Okan; Melnick, Daniel; Damla Altınbaş, Cevza; Zeynel Öztürk, Muhammed; Oruç Baykara, Mehmet; Shen, Chuan-Chou

    2016-04-01

    Cyprus, an island located in the Eastern Mediterranean region, is a part of subduction zone that defines the plate boundary at the southern margin of the Central Anatolian Plateau. The presence of uplifted marine terraces, wave-cut notches, surface ruptures and tsunami deposits are pieces of evidence of subduction related active deformation in the northern part of the island. To understand timing, mode and rate of deformation, we conducted high-resolution geomorphic mapping of marine terraces and levelling of wave-cut notches by using drone and DGPS. Tsunami boulders and boulder trains reaching up to 5-6 meters were discovered and surface rupture of an earthquake strechting from offshore to onshore was mapped for the first time with this study. Coral fossils were collected from marine terraces and tsunami boulders for age determinations by U-Th and 14C dating techniques, respectively. U-Th dating results indicate 144±12 (2s) ka for the MIS5e terrace at 40 m above sea level and 14C ages show the late Holocene (<4.5 ka) coseismic deformation. Here we will present tectonic implicatios from temporal and spatial distribution of marine terraces and wave-cut notches along the northern Cyprus. This study is supported by the Istanbul Technical University Research Found (Project no: 37548).

  3. Survey of nine surface mines in North America. [Nine different mines in USA and Canada

    Energy Technology Data Exchange (ETDEWEB)

    Hayes, L.G.; Brackett, R.D.; Floyd, F.D.

    1981-01-01

    This report presents the information gathered by three mining engineers in a 1980 survey of nine surface mines in the United States and Canada. The mines visited included seven coal mines, one copper mine, and one tar sands mine selected as representative of present state of the art in open pit, strip, and terrace pit mining. The purpose of the survey was to investigate mining methods, equipment requirements, operating costs, reclamation procedures and costs, and other aspects of current surface mining practices in order to acquire basic data for a study comparing conventional and terrace pit mining methods, particularly in deeper overburdens. The survey was conducted as part of a project under DOE Contract No. DE-AC01-79ET10023 titled The Development of Optimal Terrace Pit Coal Mining Systems.

  4. An Igneous Origin for Features of a Candidate Crater-Lake System in Western Memnonia, Mars

    Science.gov (United States)

    Leverington, D. W.; Maxwell, T. A.

    2004-01-01

    The association of channels, inner terraces, and delta-like features with Martian impact craters has previously been interpreted as evidence in favor of the past existence of crater lakes on Mars. However, examination of a candidate crater-lake system in western Memnonia suggests instead that its features may have formed through igneous processes involving the flow and ponding of lava. Accumulations of material in craters and other topographic lows throughout much of the study region have characteristics consistent with those of volcanic deposits, and terraces found along the inner flanks of some of these craters are interpreted as having formed through drainage or subsidence of volcanic materials. Channels previously identified as inlets and outlets of the crater-lake system are interpreted instead as volcanic rilles. These results challenge previous interpretations of terrace and channel features in the study region and suggest that candidate crater lakes located elsewhere should be reexamined.

  5. Subsidence and volcanism of the Haleakala Ridge, Hawaii

    Science.gov (United States)

    Moore, J.G.; Clague, D.A.; Ludwig, K. R.; Mark, R.K.

    1990-01-01

    Side-looking sonar (GLORIA) mapping has revealed a series of four arcuate bands of high sonic backscatter on the crest of the Haleakala Ridge, a major rift-zone ridge extending 135 km east of the island of Maui. Dredge recovery indicates that the shallowest of these bands is a drowned coral reef, and the deeper bands are also inferred to be coral reefs. The reefs occur above a prominent submarine bench 1500-2500 m deep on the ridge (H-terrace) that marks the shoreline at the end of vigorous shield building of Haleakala volcano when lava flows ceased crossing and reworking the shoreline. Since their growth these reefs have subsided as much as 2200 m and have tilted systematically about 20 m/km southward as a result of post-reef volcanic loading on the island of Hawaii, whose center of mass is about directly south of the Haleakala Ridge. The 234U/238U age of the dredged coral is 750 ?? 13 ka, in reasonable agreement with an age of 850 ka for the underlying H terrace previously estimated from its relationship to other dated reefs to the southwest. Basalt glass fragments dredged from the Haleakala Ridge below the H terrace are tholeiitic and contain high sulfur indicative of eruption in water deeper than 200 m. Basalt glass fragments associated with the reefs above the H terrace are dominantly tholeiitic and contain intermediate sulfur contents, indicative of subaqueous eruption in shallow, near-shore conditions. One alkalic glass fragment was recovered above the H terrace. These relations indicate that the morphologic end of shield building as recorded by construction of the H terrace was not accompanyed by a change from tholeiitic to alkalic basalt; instead tholeiite eruptions continued for some time before the erupted lava became alkalic. ?? 1990.

  6. Reconstructing the magnitude and timing of late Pleistocene and Holocene strike-slip events within the Marlborough Fault Zone, New Zealand

    Science.gov (United States)

    Rhodes, Ed; Dolan, James; Van Dissen, Russ; Langridge, Rob; Zinke, Rob; Hatem, Alex; McGuire, Chris; Brown, Nathan

    2017-04-01

    In most instances, information about the timing of pre-historic earthquake events comes from palaeoseismic trenches located within sediments that were deposited gradually and are close to the fault. Earthquake events are recognised by disturbed stratigraphy, and the timing provided by radiocarbon dating of organic materials that constrain the youngest disturbances for each event. In contrast, fault slip rates are typically derived from the dating of geomorphic features that are offset by one or more slip events. In this latter case, it is often hard to locate suitable organic material for dating these features which often comprise fluvial terraces or channels, and a variety of alternative chronological approaches has been taken including the use of terrestrial cosmogenic nuclides (TCNs; 10Be, 36Cl), U-series dating of carbonate overgrowths on pebbles, and/or luminescence dating of sediments. Using luminescence dating based on single grains of K-feldspar and a post-IR IRSL (Infra-Red Stimulated Luminescence) measurement protocol, we have been able to control the age of several offset terrace units from a number of major strike slip faults of the Marlborough Fault Zone, New Zealand. In the past, arguments concerning the selection of which geomorphic terrace feature to date have been presented, and typically a single age estimate, or small number of dates were used to constrain the derived slip rate. In the Marlborough region, we have sampled several locations characterised by multiple fluvial terraces dating from the late Glacial period (c. 16,000 years ago) through the Holocene. By using a high sampling density involving multiple age estimates within each terrace, dating each one of the terraces, and applying a Bayesian statistical approach to constrain the age of deposition and incision events, we are able to approach a situation where we can derive slip-per-event data and event timing from the same dataset. This can overcome problems of relating observed slip

  7. Quantifying Ancient Maya Land Use Legacy Effects on Contemporary Rainforest Canopy Structure

    Directory of Open Access Journals (Sweden)

    Jessica N. Hightower

    2014-11-01

    Full Text Available Human land use legacies have significant and long-lasting ecological impacts across landscapes. Investigating ancient (>400 years legacy effects can be problematic due to the difficulty in detecting specific, historic land uses, especially those hidden beneath dense canopies. Caracol, the largest (~200 km2 Maya archaeological site in Belize, was abandoned ca. A.D. 900, leaving behind myriad structures, causeways, and an extensive network of agricultural terraces that persist beneath the architecturally complex tropical forest canopy. Airborne LiDAR enables the detection of these below-canopy archaeological features while simultaneously providing a detailed record of the aboveground 3-dimensional canopy organization, which is indicative of a forest’s ecological function. Here, this remote sensing technology is used to determine the effects of ancient land use legacies on contemporary forest structure. Canopy morphology was assessed by extracting LiDAR point clouds (0.25 ha plots from LiDAR-identified terraced (n = 150 and non-terraced (n = 150 areas on low (0°–10°, medium (10°–20°, and high (>20° slopes. We calculated the average canopy height, canopy openness, and vertical diversity from the LiDAR returns, with topographic features (i.e., slope, elevation, and aspect as covariates. Using a PerMANOVA procedure, we determined that forests growing on agricultural terraces exhibited significantly different canopy structure from those growing on non-terraced land. Terraces appear to mediate the effect of slope, resulting in less structural variation between slope and non-sloped land and yielding taller, more closed, more vertically diverse forests. These human land uses abandoned >1000 years ago continue to impact contemporary tropical rainforests having implications related to arboreal habitat and carbon storage.

  8. London forces in highly oriented pyrolytic graphite

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    L.V. Poperenko

    2017-07-01

    Full Text Available Surface of highly oriented pyrolytic graphite with terrace steps was studied using scanning tunneling microscopy with high spatial resolution. Spots with positive and negative charges were found in the vicinity of the steps. Values of the charges depended both on the microscope needle scan velocity and on its motion direction. The observed effect was theoretically explained with account of London forces that arise between the needle tip and the graphite surface. In this scheme, a terrace step works as a nanoscale diode for surface electric currents.

  9. Space-based solar power generation: staged scenario

    Energy Technology Data Exchange (ETDEWEB)

    Glaser, P.E. [Arthur D. Little, Inc., Cambridge, MA (United States); Davidson, F.P. [Massachusetts Inst. of Technology, Macro-Engineering Research Group, Cambridge, MA (United States); Csigi, K.I. [ERIC International, Cambridge, MA (United States)

    1998-06-01

    Despite forecasts of increased global energy demand and warnings of environmental degradation associated with fossil fuel use, the idea of solar power satellites (SPS) generating power for microwave transmission to the Earth`s surface, has met widespread opposition or simply apathy. The authors urge a staged approach to the ultimate goal of developing SPS technology and infrastructure to meet global energy forecasts. The ``terracing`` idea means that technologies applicable to SPS will be developed to meet existing or planned projects to known scientific and economic value. A forty year growth plan for the ``terraced`` evolution of the solar power satellite is set out to illustrate this idea. (UK)

  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. Relative Path Impact Index (RPII): a morphometric approach to quantify the effect of anthropogenic features on surface flow processes in agricultural landscapes

    Science.gov (United States)

    Tarolli, P.; Prosdocimi, M.; Sofia, G.; Preti, F.; Dalla Fontana, G.

    2014-12-01

    Soil erosion in cultivated land is one of the main critical issue because of its significant economic consequences, especially whether it occurs in hilly and mountainous environments. Among the cultivated lands, vineyards deserve a particular attention. In fact, they not only represent one of the most important crop in terms of income and employment, but they also constitute the form of agricultural land use that causes the highest soil loss. In these cultivated lands, the construction of terraces is one of the most widely used system for soil and water conservation measures. However, while favoring agricultural activities, terraces may cause local instabilities as well, if they are not properly maintained. Terraced fields are also served by agricultural roads and the construction of these anthropogenic features can have deep effects on water flows and instabilities. In fact, the plane surface of roads can intercept the overland and the subsurface flow and can modify the natural flow directions expanding the drainage network. The main objective of this work is to use high-resolution topography derived from lidar technology for a hydro-geomorphological analysis of terraced vineyards. We considered few case studies located in Italy. At first, the Relative Path Impact Index (RPII) is used to identify likely sections of terraces and agricultural roads subject to potential landsliding or erosion. Statistical thresholds of RPII are then defined to label the most critical areas. Afterwards, using the index and the defined thresholds, different scenarios of soil conservation measures are simulated, to establish the optimal solution for erosion reduction. The results prove the effectiveness of high-resolution topography in the analysis of surface erosion in terraced vineyards, when the surface water flow is the main factor triggering the instabilities. This preliminary analysis can help in scheduling a suitable planning to mitigate the consequences of the anthropogenic

  12. The Gediz River fluvial archive: A benchmark for Quaternary research in Western Anatolia

    Science.gov (United States)

    Maddy, D.; Veldkamp, A.; Demir, T.; van Gorp, W.; Wijbrans, J. R.; van Hinsbergen, D. J. J.; Dekkers, M. J.; Schreve, D.; Schoorl, J. M.; Scaife, R.; Stemerdink, C.; van der Schriek, T.; Bridgland, D. R.; Aytaç, A. S.

    2017-06-01

    The Gediz River, one of the principal rivers of Western Anatolia, has an extensive Pleistocene fluvial archive that potentially offers a unique window into fluvial system behaviour on the western margins of Asia during the Quaternary. In this paper we review our work on the Quaternary Gediz River Project (2001-2010) and present new data which leads to a revised stratigraphical model for the Early Pleistocene development of this fluvial system. In previous work we confirmed the preservation of eleven buried Early Pleistocene fluvial terraces of the Gediz River (designated GT11, the oldest and highest, to GT1, the youngest and lowest) which lie beneath the basalt-covered plateaux of the Kula Volcanic Province. Deciphering the information locked in this fluvial archive requires the construction of a robust geochronology. Fortunately, the Gediz archive provides ample opportunity for age-constraint based upon age estimates derived from basaltic lava flows that repeatedly entered the palaeo-Gediz valley floors. In this paper we present, for the first time, our complete dataset of 40Ar/39Ar age estimates and associated palaeomagnetic measurements. These data, which can be directly related to the underlying fluvial deposits, provide age constraints critical to our understanding of this sequence. The new chronology establishes the onset of Quaternary volcanism at ∼1320ka (MIS42). This volcanism, which is associated with GT6, confirms a pre-MIS42 age for terraces GT11-GT7. Evidence from the colluvial sequences directly overlying these early terraces suggests that they formed in response to hydrological and sediment budget changes forced by climate-driven vegetation change. The cyclic formation of terraces and their timing suggests they represent the obliquity-driven climate changes of the Early Pleistocene. By way of contrast the GT5-GT1 terrace sequence, constrained by a lava flow with an age estimate of ∼1247ka, span the time-interval MIS42 - MIS38 and therefore do not

  13. Holocene aggradation of the Dry Tortugas coral reef ecosystem

    Science.gov (United States)

    Brock, J. C.; Palaseanu-Lovejoy, M.; Poore, R. Z.; Nayegandhi, A.; Wright, C. W.

    2010-12-01

    Radiometric age dating of reef cores acquired at the Dry Tortugas coral reef ecosystem (DTCRE) was merged with lidar topographic mapping to examine Holocene reef development linked to spatial variation in growth and erosion under the control of sea level. Analysis of variance of lidar topography confirmed the presence of three distinct terraces on all three major DTCRE banks (Loggerhead Bank, Garden Bank, and Pulaski Bank). Reef building on the middle terrace (T2) began atop Pleistocene edifices on Loggerhead Bank by 8.0 ka (thousands of years ago) and on Garden Bank by 7.2 ka at elevations of about -16.0 m and -11.9 m, respectively, relative to present mean sea level. Following this initiation at different elevations, T2 aggraded vertically on both banks at different rates during the early Holocene under foundering conditions until a highstand at 5.2 ka, resulting in a 2.21 m offset in present mean T2 elevation between these banks. Initiation of an upper terrace (T1) occurred on both Loggerhead Bank and Garden Bank in association with sea-level fall to a lowstand at near 4.8 ka. This upper terrace initiated on Garden Bank at about 5.0 ka and then grew upward at rate of 2.5 mm year-1 until approximately 3.8 ka. On Loggerhead Bank, the upper T1 terrace formed after 4.5 ka at a higher vertical aggradation rate of 4.1 mm year-1, but at a lower elevation than on Garden Bank. Terrace T1 aggraded on Loggerhead Bank below the elevation of lowstands during late Holocene sea-level oscillation, and consequently erosion on Loggerhead Bank was minimal and likely limited to the crest of the upper terrace. In contrast, after 3.8 ka terrace T1 on Garden Bank likely tracked sea level and consequently underwent erosion when sea level fell to second, third and fourth lowstands at 3.3, 1.1, and 0.3 ka.

  14. Work on the extension of Restaurant No. 1

    CERN Document Server

    GS Department

    2010-01-01

    The work on the extension of Restaurant No. 1 began on 12 April and is expected to take 6 months to complete. For safety reasons, a worksite perimeter fence has been erected on the terrace, and a watertight shielding wall has been put up inside the restaurant. Restaurant customers are requested to comply with the signs in place. Various activities associated with the work are likely to generate noise and dust. As the terrace is used by diners in the summer, such activities will be kept to a minimum during mealtimes. We should like to thank the customers of the restaurant for their understanding. GS/SEM Group

  15. The period from the Last Interglacial to the Last Glacial Maximum (MIS 5 - 2) in different archives of southern Italy

    Science.gov (United States)

    Sauer, Daniela; Wagner, Stephen; Al-Sharif, Riyad; Brückner, Helmut; Scarciglia, Fabio; Mastronuzzi, Giuseppe; Stahr, Karl

    2010-05-01

    Sediment cores from S Italy provide excellent archives of Late Pleistocene climate and vegetation changes, particularly from the Lago Grande di Monticchio (Allen et al., 2000; Brauer et al., 2007), the crater lakes of the central West coast of Italy, Valle di Castiglione, Lagaccione, Lago di Vico, Stracciacappa (Follieri et al., 1998) and the marine core GNS84-C106 in the Gulf of Salerno (Di Donato et al., 2008). These records show that woody Mediterranean vegetation covered the region during most of the Last Interglacial (from 129-127 ka BP until 115-116 ka BP). In the last phase of the interglacial (from 115-116 ka BP until about 110 ka BP), the forest composition changed, showing an increase in Abies and Alnus and a decrease in Mediterranean taxa. The interglacial was terminated by the Melisey I Stadial, during which grasses and Betula predominated. Forests spread again during St. Germain I, but they consisted mainly of Fagus, Abies and various deciduous trees. A steppe phase (Melisey II) followed, in which Chenopodiaceae prevailed, before St. Germain II set in, with forests dominated by Abies, Ulmus and Carpinus. From the end of St. Germain II until the Lateglacial, steppe, composed of Artemisia, Gramineae and Chenopodiaceae, predominated, with week expansions of trees (mainly Pinus and Juniperus) during several periods. What information can be obtained from terrestrial geo-archives for the same region and time? Sea level highstands, corresponding to interglacial and interstadial periods, created marine terraces along the coasts of S Italy. We are currently carrying out a geomorphological, sedimentological and pedological study on a flight of 11 uplifted marine terraces in the central Gulf of Taranto, the lowermost of them falling into the time span of interest. The terraces generally comprise a gravel body, deposited in a littoral environment, covered by a layer of fine sediments of varying thickness. The latter were deposited when the terrace was still close

  16. The geomorphology of Southeast Kenya

    OpenAIRE

    Oosterom, A.P.

    1988-01-01

    A geomorphological map of an area of 66 500 km 2 in the southeastern part of Kenya has been prepared. In the littoral zone eight major terrace levels occurring between the present shore and approximately 160 m +MSL have been described. Analysis of radiometric datings and uplift rates of the coastal succession suggested that the formation of the terraces extends over the last 1.4 my of the Pleistocene. Soil development indicate a climatic change from humid to savannah co...

  17. The Nature of Surface States on Vicinal Cu (775): An STM and Photoemission Study

    OpenAIRE

    Zaki, Nader; Knox, Kevin; Osgood, Richard M.; Johnson, Peter D.; Fujii, Jun; Vobornik, Ivana; Panaccione, Giancarlo

    2014-01-01

    We report ARPES and a set of in situ STM measurements on a narrow-terrace-width vicinal Cu(111) crystal surface, Cu(775), whose vicinal cut lies close to the transition between terrace and step modulation. These measurements show sharp zone-folding (or Umklapp) features with a periodicity in k||, indicating that the predominant reference plane is that of Cu(775), i.e. that the surface is predominately step-modulated. Our measurements also show variation in Umklapp intensity with photon energy...

  18. 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

  19. Post-glacial landform evolution in the middle Satluj River valley, India

    Indian Academy of Sciences (India)

    Late Quaternary landform evolution in monsoon-dominated middle Satluj valley is reconstructed using the fragmentary records of fluvial terraces, alluvial fans, debris flows, paleo-flood deposits, and epigenetic gorges. Based on detailed field mapping, alluvial stratigraphy, sedimentology and optical chronology, two phases ...

  20. Characterisation of anisotropic etching in KOH using network etch rate function model: influence of an applied potential in terms of microscopic properties

    NARCIS (Netherlands)

    Nguyen, Q.D.; Elwenspoek, Michael Curt

    2006-01-01

    Using the network etch rate function model, the anisotropic etch rate of p-type single crystal silicon was characterised in terms of microscopic properties including step velocity, step and terrace roughening. The anisotropic etch rate data needed have been obtained using a combination of 2 wagon

  1. Prêt-à-Loger : Zero-energy home with maximum living quality increase

    NARCIS (Netherlands)

    Van den Dobbelsteen, A.A.J.F.

    2015-01-01

    At the Solar Decathlon Europe 2014 (SDE2014) competition (Versailles, France), the team from the Delft University of Technology (TU Delft) took a stance by not constructing a new-built house but demonstrating the energy renovation of a typical Dutch terraced house. Around a quarter of Dutch housing

  2. Inside and outside views of Restaurant 1

    CERN Multimedia

    Maximilien Brice

    2006-01-01

    These images are taken in Restaurant 1 at CERN. The restaurant is a place where many people meet for dinner or just a chat. Accents from all over the world can be heard discussing everything from particle physics to the weekend's activities. The restaurant opens up onto a large terrace area which is usually filled during the summer months.

  3. Diffusion and incorporation of a surfactant : In on (vicinal) Cu(001)

    NARCIS (Netherlands)

    van Gastel, R; Rosu, M. F.; Rost, MJ; Niesen, L; Frenken, JWM

    2004-01-01

    We investigate the behaviour of submonolayer amounts of indium at steps and in terraces on Cu(0 0 1) and Cu(1 1 17) surfaces at temperatures between 120 and 300 K by means of variable temperature scanning tunneling microscopy (STM). We find that after deposition all indium atoms attach to steps and

  4. The effect of size on the oxygen electroreduction activity of mass-selected platinum nanoparticles

    DEFF Research Database (Denmark)

    Pérez Alonso, Francisco; McCarthy, David N; Nierhoff, Anders

    2012-01-01

    A matter of size: The particle size effect on the activity of the oxygen reduction reaction of size-selected platinum clusters was studied. The ORR activity decreased with decreasing Pt nanoparticle size, corresponding to a decrease in the fraction of terraces on the surfaces of the Pt nanopartic...

  5. The Effect of Size on the Oxygen Electroreduction Activity of Mass‐Selected Platinum Nanoparticles

    DEFF Research Database (Denmark)

    Pérez Alonso, Francisco; McCarthy, David Norman; Nierhoff, Anders Ulrik Fregerslev

    2012-01-01

    A matter of size: The particle size effect on the activity of the oxygen reduction reaction of size-selected platinum clusters was studied. The ORR activity decreased with decreasing Pt nanoparticle size, corresponding to a decrease in the fraction of terraces on the surfaces of the Pt nanopartic...

  6. Swath bathymetric investigation of the seamounts located in the Laxmi Basin, eastern Arabian Sea

    Digital Repository Service at National Institute of Oceanography (India)

    Bhattacharya, G.C.; Murty, G.P.S.; Srinivas, K.; Chaubey, A.K.; Sudhakar, T.; Nair, R.R.

    consists of three major edifices. These seamounts are elongated in plan and have heights and basal areas varying between 1068-2240 m and 300-1210 sq km, respectively. Steep lower flanks, flat plateaus, terraces, secondary peaks, and an extensive dendritic...

  7. Tedmical Note on Local Adaptations to Soil Erosion and Low Soil ...

    African Journals Online (AJOL)

    digenous soil and water conservation practices in response to soil erosion and low soil moisture. The main indigenous methods used were intercropping, trash lines, stone bunds, minimum tillage, grass strips, ''janyajuu t t terraces and their combinations. The farmers' decision to adapt a particular tech- nique was influenced ...

  8. Radon in Rented Accommodation and Variables Determining Its Level

    DEFF Research Database (Denmark)

    Rasmussen, Torben Valdbjørn

    2017-01-01

    Bq/m3 in 5.9% of the homes. Of the investigated variables, only homes in single-family terraced houses, were statistically significant. Approx. 75% of homes exceeding 100 Bq/m3 indoor radon level had levels between 100 and 200 Bq/m3 and 25% had indoor radon levels exceeding 200 Bq/m3. Significant...

  9. A Cultural Resource Inventory of Portions of Lake Oahe, Corson County, South Dakota. Volume 1.

    Science.gov (United States)

    1987-07-01

    Physalis heterophylla) and giant hyssop ( Agastache foeniculaceum) are some typicaT plants of these open forests. The higher alluvial floodplain terrace...Potential Plant Resources. Uses: C ~ommnityzoccurrence: ~!l Ace-r negundo X c GAHR1Sox elder Achilles miIlefoli - X X GR.MG.ft.V 1 111Yarrow Agastache

  10. The Geomorphology of Puget Sound Beaches

    Science.gov (United States)

    2006-10-01

    University of Washington. This document may be freely copied and dis- tributed without charge. Cover: Storm event at Cama Beach, Camano Island. Photo...seepage face, Cama Beach, Camano Island and seep-induced rilling of the low-tide terrace, Kitsap Memorial State Park, Hood Canal...38 5.17. Transverse bars off the west coast of Camano Island

  11. Geomorphology and soil survey

    Science.gov (United States)

    Laura A. Murray; Bob Eppinette; John H. Thorp

    2000-01-01

    The Coosawhatchie River, through erosion and downcutting, carved a fluvial valley through the Wicomico and Pamlico marine terraces during the late Pleistocene-Holocene period. The floodplain is relatively small and immature compared to the major river systems of the South Carolina Lower Coastal Plain. Consequently, the classic geomorphic features of a larger fluvial...

  12. Graphene formation mechanisms on 4H-SiC(0001)

    Science.gov (United States)

    Bolen, Michael L.; Harrison, Sara E.; Biedermann, Laura B.; Capano, Michael A.

    2009-09-01

    Graphene is created through thermal decomposition of the Si face of 4H-SiC in high-vacuum. Growth temperature and time are varied independently to gain a better understanding of how surface features and morphology affect graphene formation. Growth mechanisms of graphene are studied by ex situ atomic force microscopy (AFM) and scanning tunneling microscopy (STM). On the route toward a continuous graphene film, various growth features, such as macroscale step bunching, terrace pits, and fingers, are found and analyzed. Topographic and phase AFM analysis demonstrates how surface morphology changes with experimental conditions. Step-bunched terraces and terrace pits show a strong preference for eroding along the {112¯0} planes. Data from AFM are corroborated with STM to determine the surface structure of the growth features. It is shown that elevated finger structures are SiC while the depressed interdigitated areas between the fingers are comprised of at least a monolayer of graphene. Graphene formation at the bottom of terrace pits shows a dependence on pit depth. These features lend support for a stoichiometric view of graphene formation based on the number of decomposing SiC bilayers.

  13. What we do | Page 36 | IDRC - International Development Research ...

    International Development Research Centre (IDRC) Digital Library (Canada)

    Democratic Republic Of The Congo, Somalia, China, Kenya, Sierra Leone, Turkey, Zambia, Republic Of Congo, South Africa ... This project will test terrace farming innovations and offer strategies for NGOs to help 100,000 Nepalese entrepreneurs by establishing a start-up company to support product sales. Nepal, Canada.

  14. What we do | Page 42 | IDRC - International Development Research ...

    International Development Research Centre (IDRC) Digital Library (Canada)

    Democratic Republic Of The Congo, Somalia, China, Kenya, Sierra Leone, Turkey, Zambia, Republic Of Congo, South Africa ... This project will test terrace farming innovations and offer strategies for NGOs to help 100,000 Nepalese entrepreneurs by establishing a start-up company to support product sales. Nepal, Canada.

  15. All projects related to | Page 111 | IDRC - International Development ...

    International Development Research Centre (IDRC) Digital Library (Canada)

    Region: Democratic Republic of the Congo, Somalia, China, Kenya, Sierra Leone, Turkey, Zambia, Republic of Congo, South Africa ... Project. This project will test terrace farming innovations and offer strategies for NGOs to help 100,000 Nepalese entrepreneurs by establishing a start-up company to support product sales.

  16. Climate Change Vulnerability and the Use of Indigenous ...

    African Journals Online (AJOL)

    Climate Change Vulnerability and the Use of Indigenous Technologies for Adaptation among Smallholder Farming Communities in sub Saharan Africa. ... planting; mulching to retain soil moisture, texture and fertility; terrace building to prevent soil erosion; use of fertilizers; and prayers for God's intervention among others.

  17. Very large cryoturbation structures of Last Permafrost Maximum age at the foot of the Qilian Mountains (NE Tibet Plateau, China)

    NARCIS (Netherlands)

    Vandenberghe, J.F.; Wang, X.; Vandenberghe, D.

    2016-01-01

    Unusually large cryoturbation structures (4-4.5 m amplitude), developed in channel gravels and overbank fine-grained deposits of a river terrace on the NE Tibet Plateau, China, were formed by loadcasting as late Pleistocene-age permafrost degraded. It is suggested that the oversaturation and

  18. Ethiopian Journal of Development Research

    African Journals Online (AJOL)

    Socio-economic and environmental effects of tourism in Konso Terrace and cultural landscape, Ethiopia: perception of local communities · EMAIL FULL TEXT EMAIL FULL TEXT · DOWNLOAD FULL TEXT DOWNLOAD FULL TEXT. Abdibeshir Said, Engdawork Assefa, 139-198 ...

  19. Tsunami and coseismic deformations along the coast of Avachinsky Bay (Kamchatka, Russia): new evidences for the past 4300 years.

    Science.gov (United States)

    Pinegina, Tatiana

    2017-04-01

    Avachinsky Bay is one of the three biggest Bays on the Eastern side of Kamchatka peninsula. The distance between the Avachinsky Bay shoreline and Kurile- Kamchatsky trench vary from 170 up to 210 km. It is why the coseismic subsidence with amplitude more then 0.5 m could occur here only during the strongest (M≥8) subduction-type earthquakes with wide sources. We did the paleoseismological study at the wave-build Holocene marine terrace along 70 km of Avachinsky Bay shoreline: investigated the geological history of terrace development; the positions of the coastlines for the different periods of the middle and late Holocene; we studied the tsunami deposits and had restored paleotsunami intensity. We found that most ancient part of marine terrace was formed 4300 years BP. Since that time, tsunami with runup ≥4 m affected the Avachinsky Bay coast more then 30 times. And only 3 earthquakes for the past 4300 years were accompanied by coseismic subsidence with amplitude 1±0.5 m. The buried erosional scarps along the marine terrace are geological imprint of coseismic subsidence. We tracked the buried scarps 70 km along the shoreline. The age of the uncovered buried erosional scarps are 1200 ±50, 2450 ±50 and 3400 ±100 14-C BP. It means that average frequency of "wide-sources" great earthquakes for the south Kamchatka are about 1000-1200 years. This work supported by Russian Foundation for Basic Research, grant # 15-05-02651-a to Pinegina.

  20. Biochar-amended filter socks reduce herbicide losses via tile line surface inlets

    Science.gov (United States)

    Standing water in depressions and behind terraces in fields with subsurface drainage systems can result in reduced crop yields. This concern can be partially alleviated by installing surface inlets that reduce the duration of ponding. Unfortunately, these inlets provide an open conduit for surface w...

  1. Post-glacial landform evolution in the middle Satluj River valley ...

    Indian Academy of Sciences (India)

    The terrain witnessed high magnitude floods during transitional climate (∼6.5–7 ka). The fluvial sedimentation was punctuated by short-lived debris flows and alluvial fans during the LGM (weak ISM), early to mid-Holocene transition climate and mid- to late-Holocene decliningISM. Based on the terrace morphology, ...

  2. Radon Infiltration in Rented Accommodation

    DEFF Research Database (Denmark)

    Rasmussen, Torben Valdbjørn

    2017-01-01

    Indoor radon levels were measured in 221 homes located in 53 buildings, including 28 multi-occupant houses and 25 single-family terraced houses. The homes consisted of rented accommodation located in buildings recorded as being constructed before 2010 and after the year 1850. The radon level...

  3. Soil properties in 35 y old pine and hardwood plantations after conversion from mixed pine-hardwood forest

    Science.gov (United States)

    D. Andrew Scott; Michael G. Messina

    2009-01-01

    Past management practices have changed much of the native mixed pine-hardwood forests on upland alluvial terraces of the western Gulf Coastal Plain to either pine monocultures or hardwood (angiosperm) stands. Changes in dominant tree species can alter soil chemical, biological, and physical properties and processes, thereby changing soil attributes, and ultimately,...

  4. 75 FR 78729 - Notice of Availability of a Draft Environmental Impact Statement for the Sunset Area Community...

    Science.gov (United States)

    2010-12-16

    ... neighborhood as a whole and determine what future land use redevelopment is possible and what public service... Sunset Terrace area redevelopment as well as evaluate secondary proposals such as neighborhood... recreation; plants and animals; public services, including public education, safety, health, and social...

  5. Engineering geological mapping of Dar es Salaam city, Tanzania ...

    African Journals Online (AJOL)

    The terraces comprised sandstones fringed by coral reefs and were backed on their west by uplifted weathered clayey sandstones. Three synoptic construction maps were also prepared:- hazard, resources and land use maps. The hazard map classifies the terrain according to slope steepness, delineates areas susceptible ...

  6. Proceedings, sixth international symposium : moisture and creep effects on paper, board and containers: Madison, Wisconsin, USA, 14-15 July 2009

    Science.gov (United States)

    John M. Considine; Sally A. Ralph

    2011-01-01

    The USDA Forest Products Laboratory sponsored the 6th International Symposium: Moisture and Creep Effects on Paper, Board and Containers at the Monona Terrace Convention Center, Madison, WI, USA on 14-15 July 2009. Attendees heard 20 technical presentations; presenters were from seven different countries and three continents. Session topics included Corrugated...

  7. Pulsaciones glaciares y terrazas marinas escalonadas en los alrededores de la Base Antártica Española. Isla Livingston. Shetland del Sur

    OpenAIRE

    López Martínez, Jerónimo; Martínez de Pisón, E.; Arche, Alfredo

    1991-01-01

    The recent fluctuations of the glaciers can be modellised near the Antartic Spanish Base (BAE), where six morainic arches are exposed, as well as eight marine terraces up to + 18. 6 m. Some conclusions about the recent evolution of the island can be drawn from the geomorphological maps and profiles elaborated.

  8. Geomorphic expression of late Quaternary sea level changes along ...

    Indian Academy of Sciences (India)

    Geomorphic expression of land-sea interaction is preserved in the form of abandoned cliffs, marine terraces,shore platforms and marine notches along the southern Saurashtra coast. These features have been used to ascertain the magnitude of sea level changes during late Quaternary.Notch morphology and associated ...

  9. Corrigendum | Schramm | African Journal of Aquatic Science

    African Journals Online (AJOL)

    LV Mukhwana, Q Luke, E Delmas, K Otoi, O Hamerlynck, L Vandepitte and B Adkins. 2016. Carbon stocks of the terraces of the Lower Tana River floodplain and delta, Kenya, prior to conversion for biofuel production. African Journal of Aquatic Science 41(1): 119–125. doi: 10.2989/16085914.2016.1151401. Addendum.

  10. kriging method of study of the groundwater quality used for irrigation

    African Journals Online (AJOL)

    Boufekane A, Saighi O

    2016-05-01

    May 1, 2016 ... the depressions and valleys are filled with quaternary alluvial deposits which are interesting terraces aquifers. The groundwater recharge is mainly controlled by infiltration of rainfall and the low water situation by the wadi Djendjen (Fig. 2). The aquifer permits the socioeconomic development of the region ...

  11. Productivity and soil properties 45 years after timber harvest and mechanical site preparation in western Montana

    Science.gov (United States)

    Luke M. Cerise; Deborah S. Page-Dumroese; Paul McDaniel; Cole Mayn; Robert. Heinse

    2013-01-01

    Site preparation following timber harvests is widely used to increase seedling establishment postharvest. Historically, dozer piling and ripping were the most common forms of site preparation in the Intermountain West. Less commonly, terracing of hill slopes was another form of site preparation on the Bitterroot National Forest in western Montana from 1961-1970 on...

  12. Focus Area Science Technology Summer Fellowship (FAST-SF)

    Indian Academy of Sciences (India)

    Elected: 1959 Section: Physics. Thosar, Prof. Baji Vinayak Ph.D. (Bombay), D.Sc. (Oxon), FNA. Date of birth: 3 April 1913. Date of death: 4 July 1998. Specialization: Nuclear Physics Address: 13, Terrace View Co-op. Housing, Society, C-2, Jeevan Bima Nagar, Borivalli West, Bombay 400 103. YouTube; Twitter; Facebook ...

  13. Benthic Monitoring pre- and post- Removal of Longliner Vessel at Palmyra Atoll National Wildlife Refuge

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — In the late fall of 2013, the U.S. Fish and Wildlife Service (Service) will remove a 121 ft. long-line fishing vessel grounded on the western terrace reef of the...

  14. Mobility Performance Algorithms for Small Unmanned Ground Vehicles

    Science.gov (United States)

    2009-05-01

    establishing a methodology to define the autonomy for all unmanned 1 Autonomous...assembling the obstacle crossing data tables (selection of the obstacle size matrix and methodology ) than may be required for full- sized tactical military...slopes, on terraces, upland flats, or bottom lands. 3 SATURATED Saturated Less than 1 ft To water table Sites waterlogged or flooded at least

  15. Environmental Assessment for Vigilant Warrior Training Site

    Science.gov (United States)

    2008-07-01

    climate (see Section 3.10). In general, pine-oak forests dominate the dry upland terraces. Beech ( Fagus americanus) and other hardwoods are found on...moist, shaded slopes and ravines. Bottomlands and creek areas favor sweetbay (Magnolia virginiana), blackgum (Nyssa sylvatica ), sycamore (Platanaus

  16. Enhancing hydrologic mapping using LIDAR and high resolution aerial photos on the Frances Marion National Forest in coastal South Carolina

    Science.gov (United States)

    Andy Maceyka; William F. Hansen

    2016-01-01

    Evaluating hydrology within coastal marine terrace features has always been problematic as watershed boundaries and stream detail are difficult to determine in low gradient terrain with dense bottomland forests. Various studies have improved hydrologic detail using USGS Topographic Contour Maps (Hansen 2001, Eidson and others 2005) or Light Detection and Ranging (LIDAR...

  17. Prehistory and History of the Upper Gila River, Arizona and New Mexico: An Archaeological Overview.

    Science.gov (United States)

    1984-02-01

    October 15. There they stayed for a month and built a canoe . On November 15 they floated on down the Gila and out of the study area. On reaching the...DESIGNATIONS: G-24; Maldonado No. 1 139 DESCRIPTION: Site Type/Function: masonry pueblo, pithouse(s). Topographic Setting: terrace. Biotic Setting

  18. Submarine physiography off Lakshadweep Islands, Arabian Sea

    Digital Repository Service at National Institute of Oceanography (India)

    Chauhan, O.S.; Chaubey, A.K.

    at 82 m (about 150 m wide) is correlatable with similar features reported from the continental shelf of the West Coast of India having an age of about 8900 radio carbon years. These terraces seem to be the manifestations of glacio-eustatic sea...

  19. Idaho Batholith Study Area Density Grid

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — A 2 kilometer terrace-density grid for the Idaho batholith study area. Number of columns is 331 and number of rows is 285. The order of the data is from the lower...

  20. Combining Land Capability Evaluation, Geographic Information ...

    African Journals Online (AJOL)

    Where terraces are recommended, acceptance by farmers is ensured not only by developing the structures from indigenous technologies (i.e., 'Weber' and 'Kab' or 'Kirit'), but also by adopting various strategies to increase their economic advantages and profitability. (Eastern Africa Social Science Research Review: 2003 ...

  1. Visualization of steps and surface reconstructions in Helium Ion Microscopy with atomic precision

    NARCIS (Netherlands)

    Hlawacek, G.; Jankowski, Maciej; Wormeester, Herbert; van Gastel, Raoul; Zandvliet, Henricus J.W.; Poelsema, Bene

    2016-01-01

    Helium Ion Microscopy is known for its surface sensitivity and high lateral resolution. Here, we present results of a Helium Ion Microscopy based investigation of a surface confined alloy of Ag on Pt(111). Based on a change of the work function of 25 meV across the atomically flat terraces we can

  2. Regulating Services as Measures of Ecological Resilience on DoD Lands

    Science.gov (United States)

    2015-11-23

    along Neuse River, Slocum Creek, and Hancock Creek to 25-33 feet on the terraces between stream systems. MCAS Cherry Point is located entirely within...water fed and flow intermittently throughout the year. Neuse River, Slocum Creek, Hancock Creek are subject to tidal fluctuations, largely wind driven

  3. Microchannel Emulsification: From Computational Fluid Dynamics to Predictive Analytical Model

    NARCIS (Netherlands)

    Dijke, van K.C.; Schroën, C.G.P.H.; Boom, R.M.

    2008-01-01

    Emulsion droplet formation was investigated in terrace-based microchannel systems that generate droplets through spontaneous Laplace pressure driven snap-off. The droplet formation mechanism was investigated through high-speed imaging and computational fluid dynamics (CFD) simulation, and we found

  4. Agroforestry trends in Punjab, Pakistan

    African Journals Online (AJOL)

    user

    2Department of Microbiology and Molecular Genetics, Faculty of Life Sciences, University of Punjab, Pakistan. Accepted 24 ..... landscape and environment. Extensive Old River terraces, recent and sub recent river plains, piedmont plains and sandy deserts with sand dunes of different heights and ... design of agroforestry.

  5. Latest Quaternary rapid river incision across an inactive fold in the northern Chinese Tian Shan foreland

    Science.gov (United States)

    Lu, Honghua; Cheng, Lu; Wang, Zhen; Zhang, Tianqi; Lü, Yanwu; Zhao, Junxiang; Li, Youli; Zheng, Xiangmin

    2018-01-01

    This work focuses on the incision process over the Tuostai anticline, a fold of the proximal structure Belt I in the northern Chinese Tian Shan foreland, where the Sikeshu River has incised deeply into the alluvial gravels and the fold's underlying bedrock strata. Field investigation and geomorphic mapping define five terraces of the Sikeshu River (designated as T1 to T5 from oldest to youngest) preserved within the Tuostai anticline. 10Be surface exposure dating and optically stimulated luminescence dating constrain stabilization of the highest three terrace surfaces at about 80 ka (T1), 16 ka (T2), and 15 ka (T3), respectively. Around 16 ka, the calculated river incision rates significantly increase from 6 mm/yr. Undeformed longitudinal profiles of terraces T2, T3 and T4 over the Tuostai anticline suggest that this structure may have been tectonically inactive since stabilization of these three terraces. We thus think that the observed rapid river incision over the Tuostai anticline has not been largely forced by tectonic uplift. Instead, the progressively warmer and wetter palaeoclimatic condition within the Tian Shan range and its surrounding area during the period of ∼20-10 ka may have enhanced river incision across the Tuostai anticline. A reduced sediment/water ratio might have lowered the gradient of the Sikeshu River.

  6. Profile distribution of total and available Sulphur and boron in sandy ...

    African Journals Online (AJOL)

    The total and available sulphur and boron forms were determined in sandy soils formed from sand dunes, sandy alluvial terrace and sandstone formation in northwestern Nigeria. Hot water and Morgan's solution (sodium acetate/acetic acid solution buffered at pH 4.8) were used as extractants for available boron while ...

  7. Fossilization potential of iron-bearing minerals in acidic environments of Rio Tinto, Spain: Implications for Mars exploration

    Science.gov (United States)

    Fernández-Remolar, David C.; Knoll, Andrew H.

    2008-03-01

    Acidic waters of the Rio Tinto, southwestern Spain, evaporate seasonally, precipitating a variety of iron sulfide and oxide minerals. Schwertmannite and nanophase goethite form thin laminae on biological and detrital grain surfaces, replicating, among other things, the morphologies of insect cuticle, plant tissues, fungi, algae, and bacteria. Intergrain cements also incorporate bacterial cells and filaments. Other sulfate minerals precipitated in Rio Tinto environments are transient and contribute little to short-term preservation. Because the Rio Tinto has been cutting its current valley for several million years, terrace deposits provide a window on longer term fossil preservation. Early and later diagenesis are recorded in terrace deposits formed about one thousand and two million years ago, respectively. The sedimentary structures and mineralogies of these deposits suggest that they formed under physical and chemical conditions comparable to those of modern Rio Tinto sediments. The terrace deposits show quantitative loss of sulfate minerals, increasing crystallinity of goethite and, in the older terrace, replacement of goethite by hematite. Fossils formed originally by schwertmannite and nanophase goethite replication persist through diagenesis, preserving a long term record of local biological diversity. Fossil preservation by iron oxides in the acidic environment of Rio Tinto suggests that if life was present when sedimentary rocks formed at Meridiani Planum, Mars, precipitated minerals could record their presence.

  8. Rare Moss-Built Microterraces in a High-Altitude, Acid Mine Drainage-Polluted Stream (Cordillera Negra, Peru)

    NARCIS (Netherlands)

    Sevink, J.; Verstraten, J.M.; Kooijman, A.M.; Loayza-Muro, R.A.; Hoitinga, L.; Palomino, E.J.; Jansen, B.

    2015-01-01

    The Rio Santiago in the Cordillera Negra of Peru is severely contaminated by acid mine drainage in its headwaters. In a strongly acid stream, at about 3800 m above sea level (masl), microterraces were found with terrace walls built up of dead moss, with encrustations and interstitial fine, creamy

  9. A comparison of TT-OSL and post-IR IRSL dating of coastal deposits on Cap Bon peninsula, north-eastern Tunisia

    DEFF Research Database (Denmark)

    Thiel, Christine; Buylaert, Jan-Pieter; Murray, Andrew S.

    2012-01-01

    In this study thermally transferred (TT) OSL and post-IR elevated temperature IRSL (290 °C) (pIRIR290) dating are applied to deposits covering coastal terraces on the Cap Bon peninsula, Tunisia. Both methods perform well under standard performance tests; dose recovery tests using a modern analogue...

  10. The Early Pleistocene development of the Gediz River, Western Turkey: An uplift-driven, climate-controlled system?

    NARCIS (Netherlands)

    Maddy, D.; Demir, T.; Bridgland, D.R.; Veldkamp, A.; Stemerdink, C.; Schriek, van der T.; Westaway, R.

    2008-01-01

    This paper reports the latest details from an on-going investigation of the Early Pleistocene buried river terrace sequence of the Gediz River 40 km upstream of the Ala¿ehir graben in the Kula volcanic province, Western Turkey. Using clast lithology to characterise sediment provenance, we

  11. Calculation of heating systems for houses. [Gas heating]. Beregning af varmeanlaeg til parcelhuse

    Energy Technology Data Exchange (ETDEWEB)

    Savstrup Kristensen, L.

    1994-02-01

    Guidelines for calculations and dimensioning related to gas-fired heating systems for detached or terrace houses. Determination of heat losses, the size of boilers, hot water containers and radiators, pipe systems and the calculations of pressure loss are dealt with. (AB)

  12. Establishment and growth of white spruce on a boreal forest floodplain: interactions between microclimate and mammalian herbivory

    Science.gov (United States)

    Amy C. Angell; Knut. Kielland

    2009-01-01

    White spruce (Picea glauca (Moench) Voss) is a dominant species in late-successional ecosystems along the Tanana River, interior Alaska, and the most important commercial timber species in these boreal floodplain forests. Whereas white spruce commonly seed in on young terraces in early primary succession, the species does not become a conspicuous...

  13. El espacio de bancales en el tramo inferior de la cuenca del Guiniguada: características ecoantrópicas y estado actual

    Directory of Open Access Journals (Sweden)

    Lidia Esther Romero Martín

    2013-11-01

    Full Text Available El tramo inferior de la cuenca del Guiniguada se caracteriza por la extensión y singularidad de los espacios de cultivo en terrazas. En este trabajo se describen las principales características geoecológicas y antrópicas de estas terrazas, con especial referencia al grado de deterioro de sus muros. El 40% de las unidades de terrazas tiene un grado de deterioro medio y alto. Se concluye que las pendiente, las forma de la ladera y litología, entre los parámetros ecológicos, y los uso y la edad transcurrida desde el abandono, entre los de carácter socio-económico, son los factores que condicionan, en distinta medida, el grado de conservación de las terrazas agrícolas.The low section of the Guiniguada basin is characterized by the extension and singularity of the spaces of culture in terraces. In this paper the principal geologic and anthropic characteristics of the above mentioned terraces are described, with special reference to the degree of deterioration of their walls. 40 % of the units of terraces has a degree of middle and high deterioration. The paper concludes that the slopes, the forms of the hillside and litology, among the ecological parameters, and the use and the age passed from the abandon, among the socio-economic parameters, are the factors that determine, in different degrees, the status of conservation of the agricultural terraces.

  14. Early soil knowledge and the birth and development of soil science

    NARCIS (Netherlands)

    Brevik, E.C.; Hartemink, A.E.

    2010-01-01

    Soils knowledge dates to the earliest known practice of agriculture about 11,000 BP Civilizations all around the world showed various levels of soil knowledge by the 4th century AD, including irrigation, the use of terraces to control erosion, various ways of improving soil fertility, and ways to

  15. Doing Math Together to Build Community

    Science.gov (United States)

    Rawding, Molly Rothermel; Call, Susan

    2016-01-01

    Last year, Annandale Terrace Elementary School (Annandale, Virginia) began exploring professional learning communities (PLC). In this article, two of Annandale's math coaches share the school's journey. On the basis of their own reflections, the coaches conclude with some recommendations for those considering embarking on a similar journey…

  16. Download this PDF file

    African Journals Online (AJOL)

    ETIWISTIC

    2013-04-29

    Apr 29, 2013 ... University of Science and Technology, P. M. B. 5080, Port. Harcourt. E-mail: ... society, environment and nature have helped to add value to African societies and the world at large. This paper ... architecture cannot be complete without his name. the stepped pyramid and the terraced pyramid of Sankara and ...

  17. Distributions of soil phosphorus in China's densely populated village landscapes

    Science.gov (United States)

    Jiaguo Jiao; Erle C. Ellis; Ian Yesilonis; Junxi Wu; Hongqing Wang; Huixin Li; Linzhang. Yang

    2010-01-01

    Purpose Village landscapes, which integrate small-scale agriculture with housing, forestry and a host of other land use practices, cover more than 2x106 km2 across China. Village lands tend to be managed at very fine spatial scales (≤30 m), with managers altering soil fertility and even terrain by terracing,...

  18. Survey, Settlement, and Population History at the Ancient Maya Site of Pacbitun, Belize

    DEFF Research Database (Denmark)

    Healy, Paul F.; Helmke, Christophe G.B.; Awe, Jaime J.

    2007-01-01

    -900), when density reached 550 persons (Periphery Zone). The impact on settlement size and distribution of topography, soils, water resources, and intensive agriculture (hillside terracing) is addressed and found to be significant. At the time of florescence, the population of the 9 sq km site is estimated...

  19. Bedrock gorges in the central mainland Kachchh: Implications for ...

    Indian Academy of Sciences (India)

    Though coseismic neotectonic activity is believed to be the major factor in the evolution of the landscape,detailed documentation and analysis of vital landscape features like drainage characteristics,bedrock gorges and terraces are lacking.The present study is a site-speci fic documentation of gorges developed in the ...

  20. Socio-economic and environmental effects of tourism in Konso ...

    African Journals Online (AJOL)

    Socio-economic and environmental effects of tourism in Konso Terrace and cultural landscape, Ethiopia: perception of local communities. ... strengthening cultural heritage preservation, publicising the local Konso culture to the rest of the world, and building the positive images of Konso as a magnificent tourist attraction.

  1. Disordered eating attitudes: demographic and clinico ...

    African Journals Online (AJOL)

    Discipline of Psychiatry, School of Medicine, University of Adelaide, Adelaide Health and Medical. Sciences Building, North Terrace ... Future research is needed. Keywords: Anthropometric, correlates, disordered eating attitudes, Nigeria, students. ...... Burnout among doctors in residency training in a tertiary hospital. Asian J ...

  2. Agriculture development and food security policy in Eritrea - An ...

    African Journals Online (AJOL)

    Therefore, the primary goal of Eritrea is to guarantee food security by introducing modern technology, irrigation, terracing, soil and water conservation, with less dependence on rainwater. Thus the Government has articulated its food policy, which stresses national ownership of grant food assistance and to achieve food ...

  3. Soil Resources Degradation and Conservation Techniques Adopted ...

    African Journals Online (AJOL)

    terracing and strip cropping are being practiced by the farmers as soil and water conservation techniques for improved crop production. Keywords: Soil erosion, small holder farmers, Gusau area, soil properties, anti-erosion measures. INTRODUCTION. Soil degradation is increasingly regarded as a major constraint to food ...

  4. socio-eceonomic determinations of farmland management practice ...

    African Journals Online (AJOL)

    Jannifer

    Environmental Education, Legislation, Strict Enforcement of Agro-Land Laws, and .... Organic manuring. 40. 26.7. Plant residue/green manuring 87. 58.0. Terracing. 38. 25.3. Source: Field data multiple responses provided. Table 2 shows that all the farmers (100%) engage in bush fallowing, multiple-cropping and minimum ...

  5. Rational versus anti-rational interpretations of science: an ape-language case-study.

    Science.gov (United States)

    Farrell, Robert P

    2006-03-01

    Robert Nola (2003) has argued that anti-rationalist interpretations of science fail to adequately explain the process of science, since objective reasons can be causal factors in belief formation. While I agree with Nola that objective reasons can be a cause of belief, in this paper I present a version of the strong programme in the sociology of knowledge, the Interests Thesis, and argue that the Interests Thesis provides a plausible explanation of an episode in the history of ape-language research. Specifically, I examine Terrace, Petitto, Sandess, & Bever (1979, 1980) illegitimate comparison of the signing of their chimpanzee, Nim, with data from human early childhood language development, and argue that Terrace et al.'s interests played a causal role in determining their sceptical beliefs concerning ape linguistic abilities. However, I go on to argue that Terrace et al.'s interests are not the only causal factors in determining their beliefs: objective reasons, associated with the institution of new methodologies, were also causally determinative of Terrace et al.'s sceptical beliefs. Consequently, I argue that belief formation in science is a multi-factorial affair wherein both interests and objective reasons have causal roles. I finish the paper with two conjectures concerning the proper locus of scientific rationality.

  6. Volume 10 No. 6 June 2010 2695 STRATEGIC NUTRIENT ...

    African Journals Online (AJOL)

    user

    2010-06-06

    Jun 6, 2010 ... The objective of this study, therefore, was to identify the most limiting nutrient to production of the crop as the strategic entry point to effective management and subsequent formulation of rationalized packages. MATERIALS AND METHODS. An on-farm experiment was conducted on bench terraces of SW ...

  7. Knickzone propagation in the Black Hills and northern High Plains: A different perspective on the late Cenozoic exhumation of the Laramide Rocky Mountains

    Science.gov (United States)

    Zaprowski, Brent J.; Evenson, Edward B.; Pazzaglia, Frank J.; Epstein, Jack B.

    2001-06-01

    Geomorphic research in the Black Hills and northern High Plains poses an intriguing hypothesis for the Cenozoic evolution of this salient of the Laramide Rockies. Most recently, geologists have appealed to late Cenozoic epeirogenic uplift or climate change to explain the post-Laramide unroofing of the Rockies. On the basis of field mapping and the interpretation of long-valley profiles, we conclude that the propagation of knickzones is the primary mechanism for exhumation in the Black Hills. Long profiles of major drainages show discrete breaks in the slope of the channel gradient that are not coincident with changes in rock type. We use the term knickzones to describe these features because their profiles are broadly convex over tens of kilometers. At and below the knickzone, the channel is incising into bedrock, abandoning a flood plain, and forming a terrace. Above the knickzone, the channel is much less incised, resulting in a broad valley bottom. Numerous examples of stream piracy are documented, and in each case, the capture is recorded in the same terrace level. These observations are consistent with migrating knickzones that have swept through Black Hills streams, rearranging drainages in their wake. We demonstrate there are two knickzone fronts associated with mapped terraces. Preliminary field evidence of soil development shows that these terraces are time transgressive in nature. Our data strongly suggest that knickzone propagation must be considered a viable mechanism driving late Cenozoic fluvial incision and exhumation of the northern High Plains and adjacent northern Rocky Mountains.

  8. Phase behavior of solvent vapor annealed thin films of PS-b-P4VP(PDP) supramolecules

    NARCIS (Netherlands)

    van Zoelen, Wendy; Asumaa, Terhi; Ruokolainen, Janne; Ikkala, OlliI; ten Brinke, Gerrit

    2008-01-01

    The phase behavior and terrace formation of solvent (chloroform) vapor annealed thin films of asymmetric comb-shaped supramolecules consisting of a polystyrene (PS) block and a supramolecular block of poly(4-vinylpyridine) (P4VP) hydrogen bonded with pentadecylphenol (PDP) on silicon oxide (SiO2)

  9. High-resolution, short-range, in-mine geophysical techniques for the delineation of South African orebodies

    CSIR Research Space (South Africa)

    Van Schoor, Abraham M

    2006-07-01

    Full Text Available of the respective planar orebodies is relatively easy to predict ahead of mining. On a local, in-mine scale, however, the geometry of these orebodies is far less predictable because of the presence of disruptive geological features such as faults, rolls, terraces...

  10. Vegetation in the Flood Plain Adjacent to the Mississippi River between Cairo, Illinois, and St. Paul, Minnesota, and in the Flood Plain of the Illinois River between Grafton, Illinois, and Chicago, and the Possible Impacts That Will Result from the Construction of L & D 26 and the Associated Increase in Barge Traffic,

    Science.gov (United States)

    1975-01-20

    peltatum), violets ( Viola spp.), and yellow corydalis (Corydalis flavula). Because the location of the Terrace Oak-Hickory Community in the Pleistocene river...Bidens spp.). In areas of the marshes and sloughs where water stands for most of the year, lotus (Nelumbo lutea ) may occur in dense colonies. Most of the

  11. Asia Beyond the Border: Physical Geography - Central and Northeastern Asia -

    Science.gov (United States)

    1961-03-21

    Lai Shan and Baita Shan ranges, the latter one at its westernmost extension is calledTaSüeh Shah: farther west lies the Zeus range, known by several...forests • that hare sunrived here» Tomrist hotels» colorful toeddist temples aM ttisgstes raises are s&m. on the’terrace platforms» The highest

  12. Holocene development of Fredheim, Svalbard: post-glacial emergence and paleoclimatic control on geohazards

    Science.gov (United States)

    Sessford, E. G.; Etzelmüller, B.; Hormes, A.

    2012-12-01

    Fredheim is a cultural heritage site located in central Spitsbergen at 78° N, approximately 50 km northeast of the main settlement, Longyearbyen. The landscape surrounding Fredheim is dominated by Holocene depositional landforms and periglacial processes. However, geohazards are threatening the livelihood of Norwegian culture through coastal erosion and active layer detachment sliding. Therefore it is of interest to conduct a spatial and chronological terrestrial assessment to understand the paleoclimate associated with past geohazard movement in order to make assumptions for future probability of occurrence. We present a detailed Quaternary geological map illustrating the spatial development of five uplifted marine terraces highlighting a marine limit of approximately 74 m a.s.l. Lateral changes in terrace morphology illustrate the effects of steep versus low gradient shorelines and their impact on periglacial activity. Radiocarbon dates on Mya Truncata bivalve fragments are presented for chronological validation of marine terraces three and four (MT3, MT4). Fluvial erosion and depositional fans provide vital insight into uplift standstills. Cartographic work has been conducted through a combination of differential GPS measurements, and aerial image analysis. Gradient and height measurements of the detachment slide backwalls from varying terraces are used in combination with age restrictions as an analogue for past active layer thicknesses and relative time of displacement. This study results in a timeline of events and a shoreline displacement curve for Fredheim that is presented and compared with the published curve for Inner Isfjorden by Salvigsen, (1984).

  13. Gimme gimme gimme : the recent signing behaviour of chimpanzees (Pan troglodytes) in interactions with longtime human companions

    NARCIS (Netherlands)

    Rivas, E.C.M.

    2003-01-01

    This dissertation starts with a critical analysis of the scientific projects with signing chimpanzees, which were set up to see if chimpanzees could learn a human language. These projects consist of the research by the Gardners, the Fouts and the Terrace group. After the results of these projects

  14. When every drop of rain counts: Managing climate risks in the ...

    International Development Research Centre (IDRC) Digital Library (Canada)

    Each season, they set up demonstration plots: one set served as an experimental control, and was cultivated using traditional farming methods; in another, water and soil fertility management techniques — such as terracing fields, using fertilizers, and customizing the selection of crop and seed varieties — were chosen in ...

  15. The geomorphology of Southeast Kenya

    NARCIS (Netherlands)

    Oosterom, A.P.

    1988-01-01

    A geomorphological map of an area of 66 500 km 2 in the southeastern part of Kenya has been prepared. In the littoral zone eight major terrace levels occurring between the present shore and approximately 160 m +MSL have been described. Analysis of radiometric datings and

  16. Knickzone propagation in the Black Hills and northern High Plains: a different perspective on the late Cenozoic exhumation of the Laramide Rocky Mountains

    Science.gov (United States)

    Zaprowski, Brent J.; Evenson, Edward B.; Pazzaglia, Frank J.; Epstein, Jack B.

    2001-01-01

    Geomorphic research in the Black Hills and northern High Plains poses an intriguing hypothesis for the Cenozoic evolution of this salient of the Laramide Rockies. Most recently, geologists have appealed to late Cenozoic epeirogenic uplift or climate change to explain the post-Laramide unroofing of the Rockies. On the basis of field mapping and the interpretation of long-valley profiles, we conclude that the propagation of knickzones is the primary mechanism for exhumation in the Black Hills. Long profiles of major drainages show discrete breaks in the slope of the channel gradient that are not coincident with changes in rock type. We use the term knickzones to describe these features because their profiles are broadly convex over tens of kilometers. At and below the knickzone, the channel is incising into bedrock, abandoning a flood plain, and forming a terrace. Above the knickzone, the channel is much less incised, resulting in a broad valley bottom. Numerous examples of stream piracy are documented, and in each case, the capture is recorded in the same terrace level. These observations are consistent with migrating knickzones that have swept through Black Hills streams, rearranging drainages in their wake. We demonstrate there are two knickzone fronts associated with mapped terraces. Preliminary field evidence of soil development shows that these terraces are time transgressive in nature. Our data strongly suggest that knickzone propagation must be considered a viable mechanism driving late Cenozoic fluvial incision and exhumation of the northern High Plains and adjacent northern Rocky Mountains.

  17. Plant biomass and species composition along an environmental gradient in montane riparian meadows

    Science.gov (United States)

    Kathleen A. Dwire; J. Boone Kauffman; E. N. Jack Brookshire; John E. Baham

    2004-01-01

    In riparian meadows, narrow zonation of the dominant vegetation frequently occurs along the elevational gradient from the stream edge to the floodplain terrace. We measured plant species composition and above- and belowground biomass in three riparian plant communities - a priori defined as wet, moist, and dry meadow - along short streamside topographic gradients in...

  18. Active fault traces along Bhuj Fault and Katrol Hill Fault, and ...

    Indian Academy of Sciences (India)

    observed on the left bank of a stream cutting the terrace. Faulting is well revealed by 10–30 cm thick gouge. Lack of any corroborating evidence show- ing displacement of Quaternary deposits makes it difficult to decipher the active nature of the fault. However, the probability cannot be ruled- out. In the outlet of the small ...

  19. Is the methanation reaction over Ru single crystals structure dependent?

    DEFF Research Database (Denmark)

    Vendelbo, Søren Bastholm; Johansson, Martin; Nielsen, Jane Hvolbæk

    2011-01-01

    The influence of monoatomic steps and defects on the methanation reaction over ruthenium has been investigated. The experiments are performed on a Ru(0 1 54) ruthenium single crystal, which contains one monoatomic step atom for each 27 terrace atoms. The methanation activity is measured at one bar...

  20. Intrinsic activity and poisoning rate for HCOOH oxidation at Pt(100) and vicinal surfaces containing monoatomic (111) steps.

    Science.gov (United States)

    Grozovski, Vitali; Climent, Víctor; Herrero, Enrique; Feliu, Juan M

    2009-08-03

    Pulsed voltammetry is used to study formic acid oxidation on Pt(2n-1,1,1) surfaces and determine the effects of the size of the (100) terrace and the (111) step density on the reaction mechanism. The intrinsic activity of the electrode through the active intermediate reaction path (j(theta=) (0)), as well as the rate constant for the CO formation (k(ads)), are calculated from the current transients obtained at different potentials. For surfaces with wide terraces, j(theta=) (0) and k(ads) are almost insensitive to the step density, which suggests that step and terrace sites have a similar activity for this reaction. For narrow terraces (n<6), the intrinsic activity diminishes. The dependence of the reaction rates on the electrode potential is also elucidated. The CO formation only takes place in a narrow potential window, very close to the potential of zero total charge, while the direct oxidation takes place even when the surface is covered by anions. The different behavior for both reactions suggests that the adsorption mode of formic acid is different for each path.