Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 22 for “"Soil map"”.
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Developing and evaluating a method to disaggregate legacy SSURGO soil maps
For soil mapping, legacy (survey) data has its greatest potential in the disaggregation of complex soil mapping units. Disaggregation in this context is possible by relating different soils within a single map unit to other known characteristics of the landscape such as slope and curvature. For the …
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Spatial variability of soil and relationship with satellite digital data in eastcentral Illinois
… imagery is of little use in large scale soil mapping, because they found few relationships between satellite-derived maps and field soil maps. Rather than evaluate imagery-derived maps by their degree of spatial correspondence with a field soil map, it seems preferable to judge the field …
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A computer-assisted method for deriving soil maps of Virginia counties
… computer-based geographic information system to map the probable soils of a county in southwestern Virginia having no soil map. To facilitate the association of known soil characteristics and interpretations with derived soil units, the procedures were based on a soil map available for a similar, …
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Development of a Hydrologic Model for an Urban Headwater Stream: The Influence of Pervious Surface Properties on Runoff Dynamics
… area, slope, etc.), infiltration potential of soil map units, LULC, and percent ISA. These datasets were analyzed to provide input parameters and develop a Storm Water Management Model (SWMM) for the MC catchment. To more accurately characterize the infiltration potential of the pervious areas …
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Análise espacial das perdas de solo no Estado da Paraíba
This study aimed to analyze the soil losses in the state of Paraiba. To study soil loss equation was used to Universal Soil Loss - USLE coupled to an Information System GIS geographically. By multiplying factors K, R, LS, C and P, were necessary data such as time series of rainfall, soil map, …
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Multi-temporal remote sensing for estimation of plant available water-holding capacity of soil
Soil maps are fundamental for agricultural management. However, mapping soils is a difficult task because of their high spatial variability and the challenge of choosing representative field sites for soil analysis. Globally, soil information is becoming a prioritized agenda, due to the increasing …
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Using Digital Methods to Reconstruct Original Topography and Landscape Wetness in the Judicial Ditch 66 Watershed, Polk County, Minnesota
… for the restored landscape was compared to a soil map of the study area to determine if the areas of wetness correspond with hydric soils. </p><p>GIS software provides helpful tools, which can produce models that can simultaneously show multiple layers of information for an area. By estimating …
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Characterising South Africa’s major dust sources
… (MSG) satellite imagery, land use and land cover maps were used to achieve the first and the second objectives of the study. Primary data involved sampling 30 soil samples in the field in order to achieve the third objective of the study. The crust, soil moisture, soil texture and grain size are …
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Assessment of SWAT to Enable Development of Watershed Management Plans for Agricultural Dominated Systems under Data-Poor Conditions
… outputs due to input parameters, specifically soils and high resolution digital elevation models, which are likely to be lacking in data-poor environments, was quantified using Monte Carlo simulation. Two sources of soil parameter values (SSURGO and STATSGO) were investigated, as well as three …
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Evaluation of Sulfidic Materials in Virginia Highway Corridors
… i) to develop a state-wide sulfide hazard rating map based on characterization of the geologic formations associated with acid roadcuts, ii) to estimate depth to sulfidic sediments in the Coastal Plain based on landscape relationships, and iii) to evaluate potential acidity testing procedures on …
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Methods for Evaluating Agricultural Enterprises in the Framework of Uncertainty Facing Tobacco Producing Regions of Virginia
… a case study example. A GIS database including soils and climatic conditions of the study area was created. Soils belonging to land capability classes 1 to 4 were considered for agricultural purposes. Agronomic requirements for specific yield levels of the enterprises considered were tabulated. …
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Improved Environmental Characterization to Support Natural Resource Decision Making: (1) Distributed Soil Characterization, and (2) Treatment of Legacy Nutrients
… address two environmental concerns: (1) accurate soil mapping and (2) treatment of nitrogen to affect water quality change.The current method of soil mapping, SSURGO (USDA‐NRCS Soil survey), is often erroneous and misleading. Two studies in this dissertation are conducted to evaluate the potential …
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The development of a methodology for the identification of potential wet grassland restoration sites in south west England
… landscape topography, catchment hydrology and soil physical characteristics, with the use of Geographical Information Systems. Landscape topography was expressed as the ln(a/tan^) topographic index, in which 'a' is the upslope area draining through the point for which the index is calculated …
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Simulating the Soil Erosion from Land Removed from CRP
… model and use it to estimate increased soil erosion due to this land use change. The Water Erosion Prediction Project (WEPP), a process based erosion prediction model developed by USDA, was utilized in this study for this purpose. Runoff and sediment yield data from a continuous com …
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Geospatial analysis of specific degradation in South Korea
… Administration (KMA); (2) a detailed soil map from the National Institute of Agriculture Sciences; (3) a 5m by 5m resolution Digital Elevation Model (DEM); and (4) land cover raster data at a 10 m resolution from the Ministry of Environment (ME). Seven regression models based on these …
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Water flow paths in soils of an undisturbed and landslide affected mature montane rainforest in South Ecuador
… and modelling of water flow paths in soils of an undisturbed and landslide affected natural Andean forest ecosystem in the south of Ecuador whose deforestation rate is one of the highest in South America. In an investigation area situated in the Andes of South Ecuador, in gentler …
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Saturated hydraulic conductivity in the humid tropics : sources of variability, implications for monitoring and effects on near-surface hydrological flow paths
… water demand and by influencing key soil properties which determine hydrological flow paths. One of these key properties sensitive to land-use change is the saturated hydraulic conductivity (Ks) as it governs vertical percolation of water within the soil profile. Low values of Ks in a …
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A model of nitrate leaching from agricultural systems in the northern neck of Virginia
… Bay. VTCROPS simulates N fate and transport in a soil-plant-atmosphere continuum in a vertical slice between two crop rows, enabling consideration of nonuniform fertilizer placement and root growth patterns. VTCROPS models atmospheric, soil and crop subsystems. Atmospheric conditions (rainfall, …
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