볏짚 피복에 의한 밭 비점오염원 유출저감효과 분석을 위한 HSPF와 SWAT 모델링
HSPF and SWAT Modelling for Identifying Runoff Reduction Effect of Nonpoint Source Pollution by Rice Straw Mulching on Upland Crops
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참고문헌
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초록
This study is to assess the reduction of non-point source pollution loads for rice straw mulching of upland crop cultivation at awatershed scale. For Byulmi-cheon watershed (1.21 km2) located in the upstream of Gyeongan-cheon, the HSPF (HydrologicalSimulation Program-Fortran) and SWAT (Soil and Water Assesment Tool), physically based distributed hydrological models wereapplied. Before evaluation, the model was calibrated and validated using 9 rainfall events. The Nash-Sutcliffe model efficiency (NSE)for streamflow using the HSPF was 0.62～0.76 and the determination coefficient (R2) for water quality (sediment, total nitrogen T-N,and total phosphorus T-P) were 0.72, 0.62, and 0.63 respectively. The NSE for streamflow using the SWAT were 0.43～0.81 andthe R2 for water quality (sediment, T-N, and T-P) were 0.54, 0.87, and 0.64 respectively. From the field experiment of 16 rainfallevents, the rice straw cover condition reduced surface runoff average 10.0 % compared to normal surface condition. By handlinginfiltration capacity (INFILT) in HSPF model, the value of 16.0 mm/hr was found to reduce about 10.0 % reduction of surfacerunoff. For this condition, the reduction effect of sediment, T-N, and T-P loads were 87.2, 28.5, and 85.1 % respectively. By handlingsoil hydraulic conductivity (SOL_K) in SWAT model, the value of 111.2 mm/hr was found to reduce about 10.0 point reduction ofsurface runoff. For this condition, the reduction effect of sediment, T-N, and T-P loads were 80.0, 83.2, and 78.7 % respectively. The rice straw surface covering was effective for removing surface runoff dependent loads such as sediment and T-P.
Abstract
This study is to assess the reduction of non-point source pollution loads for rice straw mulching of upland crop cultivation at awatershed scale. For Byulmi-cheon watershed (1.21 km2) located in the upstream of Gyeongan-cheon, the HSPF (HydrologicalSimulation Program-Fortran) and SWAT (Soil and Water Assesment Tool), physically based distributed hydrological models wereapplied. Before evaluation, the model was calibrated and validated using 9 rainfall events. The Nash-Sutcliffe model efficiency (NSE)for streamflow using the HSPF was 0.62～0.76 and the determination coefficient (R2) for water quality (sediment, total nitrogen T-N,and total phosphorus T-P) were 0.72, 0.62, and 0.63 respectively. The NSE for streamflow using the SWAT were 0.43～0.81 andthe R2 for water quality (sediment, T-N, and T-P) were 0.54, 0.87, and 0.64 respectively. From the field experiment of 16 rainfallevents, the rice straw cover condition reduced surface runoff average 10.0 % compared to normal surface condition. By handlinginfiltration capacity (INFILT) in HSPF model, the value of 16.0 mm/hr was found to reduce about 10.0 % reduction of surfacerunoff. For this condition, the reduction effect of sediment, T-N, and T-P loads were 87.2, 28.5, and 85.1 % respectively. By handlingsoil hydraulic conductivity (SOL_K) in SWAT model, the value of 111.2 mm/hr was found to reduce about 10.0 point reduction ofsurface runoff. For this condition, the reduction effect of sediment, T-N, and T-P loads were 80.0, 83.2, and 78.7 % respectively. The rice straw surface covering was effective for removing surface runoff dependent loads such as sediment and T-P.
참고문헌 (16)
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