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Evaluation of a GIS-based watershed modeling approach for sediment transport

International Journal of Agricultural and Biological Engineering 2010年第3期3卷 43-53页

作者： Vinay Nangia paul wymar James Klang Agriculture and Agri-Food Canada 960 Carling AvenueOttawaOntarioCanada Chippewa River Watershed Project 629 North 11th StreetMontevideoMinnesotaUSA Kieser&Associates 536 East Michigan AvenueSuite 300KalamazooMichiganUSA

In order to improve water quality and restore impaired watersheds,managers need to make decisions using data that are able to *** collection can be expensive,tedious and time *** all watershed managers have sufficient budgets to undertake such *** such situations using modeling approach makes *** Sediment Nutrient Assessment Program(SNAP)is a functionally distributed *** uses Geographic Information System(GIS)-based methodology employing commonly used Revised Universal Soil Loss Equation(RUSLE)to estimate the amount of erosion that can occur in the study area and Flux model for estimating the sediment *** adopting this methodology a modeler can estimate fractions of sediment contributions from the three landforms(upland,surface tiled,riparian).An intermediate result is mapping of areas producing erosion at rates above,below and equal to tolerable rates for each soil *** model works best on smaller watersheds(<4,000 hectare)where staff have time and resources to inventory water quality.A good understanding of the watershed is needed to validate the model *** model implementation is relatively cheap,cost effective and *** data and freely available information in the public domain are used for *** takes a multifaceted and holistic approach by integrating current,localized research literature,field surveys,water quality data,and GIS into one tool for refining watershed management *** SNAP model serves as a first stage of analyzing as to how bad the sedimentation problem is with limited resources.

关键词： sediment transport watershed GIS soil erosion RUSLE modeling

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