비점원오염 저감효과 분석을 위한 시단위 SWAT 유역 모델링
Hourly SWAT Watershed Modeling for Analyzing Reduction Effect of Nonpoint Source Pollution Discharge Loads
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초록
This study is to assess the effect of non-point source pollution discharge loads between tillage and no-tillage applications for upland crop areas usingSWAT (Soil and Water Assessment Tool) watershed modeling. For Byulmi-cheon small rural catchment (1.17 km2) located in upstream ofGyeongan-cheon watershed, the rainfall, discharge and stream water quality have been monitored in the catchment outlet since 2011. The SWAT modelwas calibrated and validated in hourly basis using 19 rainfall events during 2011-2013. The average Nash-Sutcliffe model efficiency and R2(determination coefficient) for streamflow were 0.67 and 0.79 respectively. Using the 10 % surface runoff reduction from experiment results for no-tillagecondition in field plots of 3 % and 8 % slopes under sesami cultivation, the soil saturated hydraulic conductivity for upland crop areas was adjusted from0.001 mm/hr to 0.0025 mm/hr in average. Under the condition, the catchment sediment, T-N (total nitrogen, TN), and T-P (total phosphorus, TP)discharge loads were reduced by 6.9 %, 7.4 %, and 7.7 % respectively.
Abstract
This study is to assess the effect of non-point source pollution discharge loads between tillage and no-tillage applications for upland crop areas usingSWAT (Soil and Water Assessment Tool) watershed modeling. For Byulmi-cheon small rural catchment (1.17 km2) located in upstream ofGyeongan-cheon watershed, the rainfall, discharge and stream water quality have been monitored in the catchment outlet since 2011. The SWAT modelwas calibrated and validated in hourly basis using 19 rainfall events during 2011-2013. The average Nash-Sutcliffe model efficiency and R2(determination coefficient) for streamflow were 0.67 and 0.79 respectively. Using the 10 % surface runoff reduction from experiment results for no-tillagecondition in field plots of 3 % and 8 % slopes under sesami cultivation, the soil saturated hydraulic conductivity for upland crop areas was adjusted from0.001 mm/hr to 0.0025 mm/hr in average. Under the condition, the catchment sediment, T-N (total nitrogen, TN), and T-P (total phosphorus, TP)discharge loads were reduced by 6.9 %, 7.4 %, and 7.7 % respectively.
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