Journal of The Korean Society of Agricultural Engineers (한국농공학회논문집)

The Korean Society of Agricultural Engineers (한국농공학회)
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Hourly SWAT Watershed Modeling for Analyzing Reduction Effect of Nonpoint Source Pollution Discharge Loads

비점원오염 저감효과 분석을 위한 시단위 SWAT 유역 모델링

  • Jang, Sun Sook (Dept. of Civil & Environmental System Engineering, Konkuk University) ;
  • Ahn, So Ra (Dept. of Civil & Environmental System Engineering, Konkuk University) ;
  • Choi, Joong Dae (Dept. of Regional Infrastructures Engineering, Kangwon National University) ;
  • Kim, Seong Joon (Dept. of Civil & Environmental System Engineering, Konkuk University)
  • Received : 2014.09.25
  • Accepted : 2014.12.30
  • Published : 2015.01.30
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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 using SWAT (Soil and Water Assessment Tool) watershed modeling. For Byulmi-cheon small rural catchment ($1.17km^2$) located in upstream of Gyeongan-cheon watershed, the rainfall, discharge and stream water quality have been monitored in the catchment outlet since 2011. The SWAT model was calibrated and validated in hourly basis using 19 rainfall events during 2011-2013. The average Nash-Sutcliffe model efficiency and $R^2$ (determination coefficient) for streamflow were 0.67 and 0.79 respectively. Using the 10 % surface runoff reduction from experiment results for no-tillage condition in field plots of 3 % and 8 % slopes under sesami cultivation, the soil saturated hydraulic conductivity for upland crop areas was adjusted from 0.001 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.

Keywords

References

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