Modelling the impacts of subsurface drainage on surface runoff and sediment yield in the Le Sueur Watershed, Minnesota, USA

摘要: Abstract Tile drainage influences infiltration and surface runoff is thus an important factor in the erosion process. reduces runoff, but questions abound on its influence sediment transport through dense network into stream network. The impact of subsurface tiling upland rates Le Sueur River watershed, USA, was assessed using Water Erosion Prediction Project (WEPP) model. Six different scenarios tile with varying coefficient management type (no till autumn mulch-till) were evaluated. mean annual depth, soil loss rate delivery ratio (SDR) for croplands, based a 30-year simulation watershed untiled mulch-till (Scenario 1), estimated to be 83.5 mm, 0.27 kg/m2 86.7%, respectively; no-till systems 4), respective results 72.3 0.06 88.2%. drains reduced SDR estimates Scenar...