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Evaluation of Applicability for Nonpoint Discharge Coefficient using Watershed Model

유역모형을 이용한 비점배출계수 적용성 평가

  • Lee, Eun Jeong (Department of Environmental Engineering, Cheongju University) ;
  • Kim, Tae Geun (Department of Environmental Engineering, Cheongju University)
  • 이은정 (청주대학교 환경공학과) ;
  • 김태근 (청주대학교 환경공학과)
  • Received : 2012.02.16
  • Accepted : 2012.04.06
  • Published : 2012.06.30

Abstract

Total maximum daily load have been implemented and indicated that nonpoint discharge coeffients in flow duration curve were 0.50 of Normal flow duration ($Q_{185}$) and 0.15 of low flow duration($Q_{275}$). By using SWAT, nonpoint discharge coefficients are studied with the conditions of the instream flow and the rainfall in two study areas. The nonpoint discharge coefficient average of BOD and TP for normal flows duration in 3 years are 0.32~0.36 and 0.28~0.31. For the low flow duration, the nonpoint discharge coefficient avergae of BOD and TP were 0.10~0.12 and 0.10~0.11. These are lower than the coefficients of total maximum load regulation. There are big differences between one of regulation and one of SWAT for the normal flow duration. With the consideration of rainfall condition, the nonpoint discharge coefficient of flood flow duration are influenced on the amount of rainfalls. However, the nonpoint discharge coefficients of normal flow duration and low flow duration are not effected by the rainfall condition. Since the spatial distribution and geomorphological characteristics could be considered with SWAT, the estimation of nonpoint discharge coefficient in watershed model is better method than the use of the recommended number in the regulation.

Keywords

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