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Evaluation of BMPs impacts on surface and groundwater using a modeling approach
Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.org
Citation: 2018 ASABE Annual International Meeting 1800130.(doi:10.13031/aim.201800130)
Authors: Xiaojing Ni, Prem B. Parajuli
Keywords: Best Management Practice, Tail water recovery system, crop management, SWAT, Satellite imagery classification
Abstract. Best management practice (BMP) is a conservational way to prevent non-point source pollution, soil, and water loss from agricultural watersheds. In this study, three BMPs including tail water recovery system were evaluated. Satellite imagery analysis was used to detect potential tail water recovery ponds within the watershed. Soil and water assessment tool (SWAT) was used to simulate the watershed processes. The model was calibrated with R2 of 0.59 and NSE of 0.59 using 15 years of monthly stream flow observations and validated with R2 of up to 0.63 and NSE of 0.62. Model simulated results indicated total nitrogen (TN) and total phosphorus (TP) loading decrease by 46% and 21% using conservational tillage as compare to conventional tillage. Sediment and flow results were not sensitive to crop rotation management. The TP loads were higher, and TN loads were lower under corn-soybean rotation scenario compared to continuous corn scenario by 45% and 67% respectively, while continuous soybean scenario predicted the lowest TN and TP loads comparing with corn-soybean rotation scenario and continuous corn scenario. Tail water recovery ponds reduced sediment loads by 7% in average and recovered groundwater storage by averagely 3.9% based on the simulation results throughout the simulated time period.
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