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Résultats de la recherche (146 résultats)

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Par Collection Par Auteur Par Date Par Sujet Par Titre
  • Understanding watershed suspended sediment transport
  • Bibliography ; Forecast ; Methodology ; Model ; Statistics ; Suspended load ; Water quality ; Watershed ; Years 2000-2009
  • at the watershed scale. The paper ends with the discussion of future developments in suspended sediment studies at the watershed scale.
  • 2008
  • Tectonic implications of geomorphometric characterization of watersheds using spatial correlation : Mohand Ridge, NW Himalaya, India
  • Digital elevation model ; Geographical information system ; Geomorphometry ; Himalaya ; India ; Spatial analysis ; Statistical analysis ; Tectonics ; Watershed
  • is weak. From the geotectonic map, the area has been divided into 3 zones. The results reveal the utility of geomorphometric parameters related to watersheds in understanding lateral variation in geotectonic framework.
  • 2008
  • Influence of landuse on soil erosion risk in the Cuyaguateje watershed (Cuba)
  • Cuba ; Cultivated land ; Deforestation ; Erodibility ; Land use ; Soil ; Soil erosion ; Soil properties ; Watershed
  • The aim of this study was to identify erosion risk areas by applying the RUSLE model within the V Aniversario watershed, a subwatershed of the Cuyaguateje watershed. Data are provided for the RUSLE factors estimated for the study area. The AA
  • 2008
  • Basin-scale precipitation analysis for southeast U.S. watersheds using high-resolution radar precipitation estimates
  • Florida ; Precipitation ; Radar ; Remote sensing ; Seasonal variability ; Spatial distribution ; Tropical cyclone ; United States of America ; Water resources ; Watershed
  • The aim of this study is to quantify local-scale precipitation patterns in 3 major watersheds in the southeast United States : the Yazoo River watershed, the Savannah River watershed, and the Everglades/Lake Okeechobee drainage basin, each of which
  • is unique regarding land-use type, population distribution, and general meteorological conditions. Additionally, each watershed exhibits unique mesoscale forcing mechanisms. Radar-derived precipitation estimates from 1996-2006 are used for analysis. Results
  • 2008
  • Spatial and temporal variability of sediment and dissolved loads from two alpine watersheds of the Lesser Himalayas
  • Carrying capacity ; Chemical erosion ; Erosion rate ; Himalaya ; India ; Land use ; Monsoon ; Mountain ; Sediment transport ; Slope gradient ; Water quality ; Watershed
  • In this study, an assessment of physical and chemical load, sediment yield and erosion rate has been undertaken at 8 different locations in the Sainj and Tirthan watersheds. The analysis revealed that the maximum load was transferred during
  • the monsoon season. Moreover, the estimated average chemical erosion rate of the Sainj and Tirthan watersheds were higher than that of the Indian average representing all the rivers. Both watersheds were eroding physically and chemically at a faster rate than
  • that of the world global average erosion rate. The flattish nature of the channels in some segments of these watersheds showed a lower transport of sediments, where as the constricted segments having steep bed slopes increased the velocity of flow and the sediment
  • 2008
  • Carrying capacity ; Flood ; Impact ; Nigeria ; Stream ; Urbanization ; Watershed
  • The focus of this paper is to examine the response of the Ntamogba Stream, a very small stream in the heart of Port Harcourt to the increasing urbanization of its watershed and to use findings thereof as guide for similar watershed management
  • 2008
  • Optical remote mapping of rivers at sub-meter resolutions and watershed extents
  • Cartography ; Channel geometry ; Habitat ; Image processing ; Methodology ; Remote sensing ; Satellite imagery ; Stream ; Texas ; Turbidity ; United States of America ; Watershed
  • 2008
  • Channel adjustments to dams in the Connecticut River basin : implications for forested mesic watersheds
  • Channel ; Connecticut ; Dam ; Fluvial hydrology ; Riparian vegetation ; Stream flow ; United States of America ; Watershed
  • 2008
  • How do streamflow generation mechanism affect watershed hypsometry ?
  • Drainage network ; Fluvial erosion ; Groundwater ; Hypsometry ; Model ; Rill wash ; Sediment transport ; Slope gradient ; Stream flow ; United States of America ; Watershed
  • previously found was significantly different for surface-runoff and groundwater-discharge basins. The AA. examine the same 45 watersheds that Luo (2000) extracted from DEM data : 25 groundwater discharge basins in Utah and Florida and 20 surface-runoff basins
  • 2008
  • California ; Geographical information system ; Hydrology ; Impact ; Model ; San Diego ; Stream ; United States of America ; Urban environment ; Urbanization ; Water quality ; Watershed
  • The AA. use the Regional Hydro-Ecologic Simulation System to examine interactions between internal watershed processes that lead to runoff production. Through a case study watershed in San Diego, the AA. address the issue of limited streamflow data
  • for model calibration, a requirement that is often difficult to meet in smaller, ungauged watersheds. They illustrate how flow data from a similar watershed, combined with sensitivity analysis, can serve to compensate for this data limitation in the context
  • of understanding urban impacts on hydrologic behavior. They then use this modeling approach to demonstrate that the conclusions made about the effects of urbanization on stream flow are a complex function of interactions between the watershed drainage network
  • 2008
  • A coupled model approach to reduce nonpoint-source pollution resulting from predicted urban growth : a case study in the Ambos Nogales watershed
  • Arizona ; Environmental management ; Model ; Pollution ; Scenario ; United States of America ; Urban growth ; Watershed
  • 2008
  • China ; Duricrust ; Loess ; Northern China ; Plateau ; Rainfall simulation ; Rill wash ; Sediment budget ; Slope gradient ; Soil erosion ; Watershed
  • In this study 5 pairs of plots with different slope angles were established in Wangjiagou watershed to investigate soil crust effect and slope angle effect on runoff production and soil loss, and to reveal the relative importance of them.
  • 2008
  • This study examines the movement of trace elements through the Alamosa River basin, a watershed in southern Colorado with a long history of mining activity. The aims of this research are to : 1) document and explain the vertical and lateral trends
  • of heavy metals in floodplain soils and sediments along the Alamosa River, 2) examine the spatial distribution of metals with distance downstream from the mined area of the watershed, and 3) use the spatial pattern of heavy metals to reconstruct past flood
  • and geomorphic history in the watershed. Heavy metals found below the reservoir may have been released to the watershed and deposited before 1912 during a period of earlier mining activity, or during flooding in 1970 and 1971 when water overtopped the dam
  • 2008
  • Effect of vegetation cover on soil erosion in a mountainous watershed
  • China ; Geographical information system ; LANDSAT ; Model ; Mountain ; Plant cover ; Remote sensing ; Sichuan ; Soil erosion ; Watershed
  • The study area is located in the Upper Min River (UMR) watershed, in Sichuan province, Southwest China. The AA. applied the Revised Soil Loss Equation (RUSLE) to assess levels of soil loss in a Geographic Information System (GIS). They used the k-NN
  • 2008
  • Arable land ; Coal ; Impact ; Landscape ; Mine ; Plateau ; Poland ; Waste ; Watershed
  • The article presents the impact of intensive coal mining on the landscape of two small agricultural catchments. The subsiding of the ground has altered the course of watersheds and caused development of numerous non-drainage basins with large water
  • 2008
  • Soil properties related to land-use systems in oases of Sangong river watershed, Xinjiang
  • 2008
  • Bibliography ; Climatic change ; Cold area ; Hydrology ; Observation network ; Permafrost ; Stream ; Water balance ; Water resources ; Watershed ; Years 2000-2009
  • of study at the small watershed scale. The response of streamflow to climate receives continued if not increasing attention, from the occurrence of extreme hydrologic events to the changing regimes of river flow at a regional scale. The effect of climate
  • 2008
  • Burundi ; Digital elevation model ; Simulation ; Slope ; Slope gradient ; Topography ; Tropical zone ; Watershed
  • to the hilltop or watershed divide.
  • 2008
  • Gully erosion ; Network ; Soil erosion ; Theory ; Watershed
  • 2008
  • Field experiment ; Organic materials ; Sediment transport ; Sedimentary ; Soil erosion ; Topography ; Vegetation ; Watershed
  • 2008