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 17 of 17 for “"flow accumulation"”.
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Using Accumulation Based Network Identification Methods to Identify Hill Slope Scale Drainage Networks in a Raster GIS
The simple accumulation-based network identification method (ANIM) in a raster Geographic Information System (GIS) posed by O'Callaghan and Mark (1984) has been criticized for producing a spatially uniform drainage density (Tarboton 2002) at the watershed scale. This criticism casts doubt on the …
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Comparison of Two Algorithms for Removing Depressions and Delineating Flow Networks From Grid Digital Elevation Models
… (DEMs) and their derivatives such as slope, flow direction and flow accumulation maps, are used frequently as inputs to hydrologic and nonpoint source modeling. The depressions which are frequently present in DEMs may represent the actual topography, but are often the result of errors. …
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Plant Successional Patterns at Sperry Glacier Foreland, Glacier National Park, MT, USA
… (e.g., surface fragmentation, concavity, flow accumulation, and solar irradiance). Sixty-one plots (each 8 square meters) were placed throughout the glacier foreland using a random sample stratified by terrain date. Percent cover, species richness, Shannon's diversity, and species evenness …
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Vegetative filter strip assessment in the state of Iowa
… enters a water-body. The project analyzes the flow accumulation of runoff with the help of Geographic Information Systems (GIS). The objectives for this project include (1) To determine the effectiveness of VFS by visual field observation and validation by flow mapping procedures in ArcGIS 9, …
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Machine Learning Based Flood Risk Modeling Using Features from Satellite, Socioeconomic, Geographic, and Building Data
… segmentation methods, elevation, slope, and flow accumulation. In addition to these flood hazard features, we also integrate flood vulnerability features from socioeconomic data and building information for each census tract.
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Identifying Locations Of Highly Eroded Agricultural Land In The Devils Lake Basin, ND Using GIS Terrain Analysis Modeling
… fairly flat landscape. The analysis used slope, flow accumulation, and stream power index (SPI) within a GIS to identify highly eroded areas. The study found that 1.5% of the 262.8 km2 study area exhibited channelized erosion. It was determined that the terrain analysis accurately identified 92 …
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Spatio-Temporal Vegetation Change as related to terrain factors at two Glacier Forefronts, Glacier National Park, Montana
… (elevation, slope, aspect, solar radiation, flow accumulation, TWI, and geology) on vegetation change at the deglaciated areas. Landsat imagery of the study locations in 1991, 2003, and 2015 were classified and validated using ground truth points and visual interpretation for accuracy. …
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Analysis of gully erosion as a hydro-geomorphological hazard in Thulamela Municipality, Limpopo Province, South Africa
… based on elevation, terrain characteristics, flow accumulation and flow direction to determine areas that are more prone to gully development. Rainfall was assessed based on its intensity and distribution over the period of the study to determine how it contributes to gully erosion. Soil …
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Natural Barrier Assessment and Modeling for Fish Communities in Delaware Water Gap National Recreation Area
… of natural barrier occurrence hot spots. Slope, flow accumulation number (watershed area) and soil type were found to be important for predicting natural barrier occurrence within our study area. Higher slopes increased the likelihood of natural barrier occurrence while lower drainage area had a …
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Creating A Stormwater Runoff Model For The City Of Oxford, Mississippi: When It Rains, Where Does That Water Go?
… threshold value or 3) hand editing. The flow direction and a weighted raster, one that incorporates the values of rainfall, evapotranspiration, impervious cover, and soil infiltration rate, is used within the flow accumulation model to achieve a stormwater runoff model. Nine pour points …
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Modeling Blister Rust Incidence in Whitebark Pine at Northern Rocky Mountain Alpine Treelines: A Geospatial Approach
… wind speed, northwest facing slopes, high flow accumulation rates, and close proximity to perennial streams have a higher likelihood of blister rust intensity, specifically total canker density. Results of this research may contribute to the understanding of the dynamics of this disease, …
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Hexagonal Discrete Global Grid Systems in Topographical and Hydrological Modeling
… functions, including slope and aspect, flow direction, flow accumulation, etc., were developed and experimented with various terrain types at different resolutions. Finally, external machine learning algorithms were incorporated into the DGGS and used to predict future flood risks under …
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Soil erosion and conservation potential of row crop farming in mountainous landscapes of South Korea
… Our first two studies analyze the subsurface flow processes, the runoff patterns, and the associated erosion rates of the widely applied plastic covered ridge-furrow system (plastic mulch), and our third study investigates the impact of herbicide applications on erosion associated with …
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Analysis and visualisation of digital elevation data for catchment management
… techniques for determining an appropriate flow accumulation threshold to delineate channel networks in the study catchment. These results were then used to quantitatively compare the positional accuracy of drainage networks derived from different DEMs. The final part of the thesis conducted …
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Desarrollo de un modelo de geoprocesamiento para la valoración productiva y tributaria de tierras agrícolas en Venezuela
… Water Balance and the geomorphometric variables Flow Accumulation and Topographic Wetness Index. Finally a geoprocess was developed for Tax Appraisal of the State lands. This model requires as input the definition of Land Use Vocation of the properties that are subject to tax, as well as the …
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Flow and transport processes as affected by tillage management under monsoonal conditions in South Korea
… under monsoonal conditions and its impact on flow processes and nitrate transport was investigated. On hillslopes, we monitored surface and subsurface flow processes in four plastic mulched potato fields using a network of tensiometers, FDR sensors, runoff collectors and flow dividers as well …
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Unsteady separation control on wind turbine blades
… wind turbine operating environments, such as inflow turbulence, wind gusts and sustained yaw misalignment. The unsteady separation due to dynamic stall can lead to excessive loads, much larger than the design loads for the turbine, and vibrations in the blade, leading to fatigue damage. …