A validation of WEPP water quality routines in uniform and nonuniform agricultural hillslopes

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外文摘要：Current watershed-scale,nonpoint source pollution models do not represent the processes and impacts of agricultural best management practices on water quality with sufficient detail.A Water Erosion Pre-diction Project-Water Quality(WEPP-WQ)model was recently developed which is capable of simulating nonpoint source pollutant transport in nonuniform hillslope conditions such as those with BMPs.However,WEPP-WQ has not been validated for these conditions,and prior validation work only eval-uated calibrated performance rather than uncalibrated performance,with the latter being most relevant to model applications.This study evaluated uncalibrated and calibrated model performance in two plot-scale,artificial rainfall studies.179 observations were compared to corresponding WEPP-WQ simulations of runoff,sediment yield,and soluble and particulate nutrient forms for both nitrogen and phosphorus.Uncalibrated validation results were mixed for the different field conditions,model configurations,and prediction variables.Nash-Sutcliffe Efficiencies for uncalibrated simulations of uniform conditions were generally greater than 0.6 except for soluble nitrogen predictions which were poor.Simulations of nonuniform conditions were generally'unsatisfactory'except for runoff predictions which were quite good(NSE=0.78).Performance was improved substantially for almost all endpoints with calibration.Some exceptions to this occurred because the objective function for calibration was based on log-space differences so as to more equally-weight calibration of unsaturated conditions that tend to produce lesser runoff volumes and sediment yields.Calibrated results for both uniform and nonuniform condi-tions were generally'satisfactory'or'good'according to widely accepted model performance criteria.

外文关键词：

Water qualityNonpointValidationVegetative filter stripBest management practiceWEPP

作者：

Ryan P.McGehee、Dennis C.Flanagan、Bernard A.Engel、John E.Gilley

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作者单位：

Department of Agricultural and Biosystems Engineering,Iowa State University,4352 Elings Hall,605 Bissel Road,Ames,IA,50011,USA

USDA-Agricultural Research Service,National Soil Erosion Research Laboratory,275 South Russell Street,West Lafayette,IN,47907,USA

Department of Agricultural and Biological Engineering,Purdue University,225 South University Street,West Lafayette,IN,47907,USA

USDA-Agricultural Research Service,Agroecosystem Management Research Unit,Room 238,Chase Hall,University of Nebraska,Lincoln,NE,68583,USA

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出版年：

2024

DOI：

10.1016/j.iswcr.2023.11.005

国际水土保持研究(英文)

ISSN：2095-6339

年,卷(期)：2024.(3)