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Improvement of the Water Erosion Prediction Project (WEPP) model for quantifying field scale subsurface drainage discharge
Agricultural Water Management ( IF 6.7 ) Pub Date : 2021-02-01 , DOI: 10.1016/j.agwat.2020.106597
J.D. Revuelta-Acosta , D.C. Flanagan , B.A. Engel , K.W. King

Abstract In the poorly drained regions of the world, subsurface drainage systems are required to remove excess water for crop growth. Plastic drains alter a field’s hydrology by lowering the water table, reducing surface ponding, and reducing surface runoff. One significant concern with the use of subsurface drainage systems is adverse environmental effects because of the modification of the soil water dynamics. Some effects include the reduction of ecological services since wetlands change to croplands, water quality concerns, particularly sediment, nitrogen, and phosphorus losses in agricultural subsurface discharge water, as well as changes in the volume and timing of off-site discharges. Hydrological simulation models predict surface and artificial subsurface flow at different scales. Often in these models, Hooghoudt-based expressions are adapted in their internal algorithms. In this study, the Water Erosion Prediction Project (WEPP) model, developed by the United States Department of Agriculture - Agricultural Research Service (USDA-ARS) for soil and water conservation planning activities, was tested and improved to simulate surface and subsurface discharges. The modified WEPP model was tested and validated on an extensive dataset collected at four experimental sites managed by USDA-ARS within the Lake Erie Watershed. Predicted drainage discharges show Nash-Sutcliffe Efficiency (NSE) values ranging from 0.50 to 0.70, and Percent Bias ranging from −30% to +15% at daily and monthly resolutions. Evidence suggests that the WEPP model can be used to produce reliable estimates of subsurface flow with minimum calibration. Future work includes the extension of the model for quantifying subsurface drainage under controlled water table and watershed-scale simulations.

中文翻译:

改进水蚀预测项目 (WEPP) 模型,用于量化野外规模的地下排水排放

摘要 在世界上排水不良的地区,需要地下排水系统来去除多余的水以促进作物生长。塑料排水管通过降低地下水位、减少地表积水和减少地表径流来改变油田的水文。使用地下排水系统的一个重要问题是由于土壤水动力学的改变而对环境产生不利影响。一些影响包括由于湿地变成农田导致生态服务减少、水质问题,特别是农业地下排放水中的沉积物、氮和磷损失,以及异地排放量和时间的变化。水文模拟模型可预测不同尺度的地表和人工地下流。通常在这些模型中,基于 Hooghoudt 的表达式在其内部算法中进行了调整。在这项研究中,美国农业部 - 农业研究局 (USDA-ARS) 为水土保持规划活动开发的水蚀预测项目 (WEPP) 模型经过测试和改进,以模拟地表和地下排放。修改后的 WEPP 模型在伊利湖流域内由 USDA-ARS 管理的四个实验站点收集的广泛数据集上进行了测试和验证。预测的排水排放显示纳什-萨特克利夫效率 (NSE) 值范围为 0.50 至 0.70,并且百分比偏差在每日和每月分辨率范围为 -30% 至 +15%。有证据表明,WEPP 模型可用于以最少的校准对地下流进行可靠的估计。
更新日期:2021-02-01
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