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• W4385880198 endingPage "166331" @default.
• W4385880198 startingPage "166331" @default.
• W4385880198 abstract "Subsurface drainage systems are effective management practices employed to remove excess soil water, thereby improving soil aeration and crop productivity. However, these systems can also contribute to water quality issues by enhancing nitrate leaching and loads from agricultural fields. The Soil and Water Assessment Tool (SWAT) is commonly used to assess nitrate loads and long-term water quality impacts from agricultural watersheds. However, the current SWAT model oversimplifies nitrate transport processes by assuming a linear relationship between nitrate concentrations in tile flow and soil nitrate content. It also neglects the time lag between nitrate loading and transport with the flow. This study aimed to enhance the accuracy of nitrate load prediction by revising the subsurface drainage routine in the SWAT model. The revised routine was tested using flow and nitrate load measurements from a typical tile-drained watershed in east-central Illinois, U.S. The results demonstrated that the revised SWAT nitrate routine outperformed the current one in simulating nitrate transport at field and watershed scales. The revised routine improved the nitrate load prediction from an unacceptable to a satisfactory or good rating on the field scale. A sensitivity analysis conducted using the revised nitrate module showed the parameters directly associated with transpiration, groundwater discharge to the reach, the lag time of tile flow, and channel flow hydraulics were the most sensitive in nitrate load simulation. In addition, different tile depth scenarios were modeled to evaluate variation in the amount of surface runoff, tile flow, and nitrate loads by the surface flow and tile flow. The results of tile configuration scenarios agreed with understanding the tile flow process. The test results demonstrated the potential of the revised SWAT nitrate module as a tool to accurately evaluate the effects of tile drainage systems on water quality." @default.
• W4385880198 created "2023-08-17" @default.
• W4385880198 creator A5038647558 @default.
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• W4385880198 date "2023-12-01" @default.
• W4385880198 modified "2023-10-12" @default.
• W4385880198 title "Improving nitrate load simulation of the SWAT model in an extensively tile-drained watershed" @default.
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• W4385880198 doi "https://doi.org/10.1016/j.scitotenv.2023.166331" @default.
• W4385880198 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/37595899" @default.
• W4385880198 hasPublicationYear "2023" @default.
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