Journal of Korean Society on Water Environment (한국물환경학회지)

Korean Society on Water Environment (한국물환경학회)
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Optimal Volume Estimation for Non-point Source Control Retention Considering Spatio-Temporal Variation of Land Surface

지표면의 시공간적 변화를 고려한 비점오염원 저감 저류지 최적용량산정

  • Choi, Daegyu (Department of Environmental System Engineering, Pukyong National University) ;
  • Kim, Jin Kwan (Department of Civil and Environmental Engineering, Korea University) ;
  • Lee, Jae Kwan (Nakdong River Water Environmental Research Center, National Institute of Environmental Research) ;
  • Kim, Sangdan (Department of Environmental System Engineering, Pukyong National University)
  • 최대규 (부경대학교 환경시스템공학부) ;
  • 김진관 (고려대학교 건축사회환경시스템공학과) ;
  • 이재관 (국립환경과학원 낙동강물환경연구소) ;
  • 김상단 (부경대학교 환경시스템공학부)
  • Received : 2010.06.28
  • Accepted : 2010.12.09
  • Published : 2011.01.30
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Abstract

In this study the optimal volume for non-point source control retention is estimated considering spatio-temporal variation of land surface. The 3-parameter mixed exponential probability density function is used to represent the statistical properties of rainfall events, and NRCS-CN method is applied as rainfall-runoff transformation. The catchment drainage area is divided into individual $30m{\times}30m$ cells, and runoff curve number is estimated at each cell. Using the derived probability density function theory, the stormwater probability density function at each cell is derived from the rainfall probability density function and NRCS-CN rainfall-runoff transformation. Considering the antecedent soil moisture condition at each cell and the spatial variation of CN value at the whole catchment drainage area, the ensemble stormwater capture curve is established to estimate the optimal volume for an non-point source control retention. The comparison between spatio-temporally varied land surface and constant land surface is presented as a case study for a urban drainage area.

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References

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