Journal of Korean Society on Water Environment (한국물환경학회지)

Korean Society on Water Environment (한국물환경학회)
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Comparative Study on Evaluating Standard Flow in Partially Gauged and Ungauged Watershed

부분계측 및 미계측 유역에서 기준유량 산정 방법 비교 연구

  • Kim, Gyeonghoon (Nakdong River Environment Research Center, National Institute of Environmental Research) ;
  • Kim, Jeongmin (Nakdong River Environment Research Center, National Institute of Environmental Research) ;
  • Jeong, Hyunki (Nakdong River Environment Research Center, National Institute of Environmental Research) ;
  • Im, Taehyo (Nakdong River Environment Research Center, National Institute of Environmental Research) ;
  • Kim, Seongmin (Nakdong River Environment Research Center, National Institute of Environmental Research) ;
  • Kim, Yongseok (Nakdong River Environment Research Center, National Institute of Environmental Research) ;
  • Seo, Mijin (Nakdong River Environment Research Center, National Institute of Environmental Research)
  • 김경훈 (국립환경과학원 낙동강물환경연구소) ;
  • 김정민 (국립환경과학원 낙동강물환경연구소) ;
  • 정현기 (국립환경과학원 낙동강물환경연구소) ;
  • 임태효 (국립환경과학원 낙동강물환경연구소) ;
  • 김성민 (국립환경과학원 낙동강물환경연구소) ;
  • 김용석 (국립환경과학원 낙동강물환경연구소) ;
  • 서미진 (국립환경과학원 낙동강물환경연구소)
  • Received : 2019.06.19
  • Accepted : 2019.10.15
  • Published : 2019.11.30
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Abstract

The Ministry of Environment has measured streamflow at eight-day intervals for the estimation of standard flow of the Total Maximum Daily Loads (TMDL) system. This study identified the availability of the partially measured the eight-day interval data for estimating standard flow and found the optimal extension techniques of standard flow. The study area was selected for the Nakbon-A watershed in the Nakdong River, and four streamflow record extension techniques of standard flow were considered: extension, percentile, drainagearea, and regional regression methods. The flow duration curve (FDC) using the eight-day interval streamflow data indicated very high Nash and Sutcliffe Efficiency (NSE) values above 90 % from FDC-II to FDC-VII compared to FDC-VIII, the standard FDC. This result demonstrates that FDC using daily data of three-six cumulative years could represent standard FDC fairly well. For the streamflow record extension techniques of standard flow, the percentile method was selected as the optimal alternative, showing the minimal difference from FDC-VIII. These results validate the availability of the eight-day interval streamflow data in the standard flow estimation and the application of extension techniques. It seems that these results could reduce the uncertainty of partially measured streamflow data for water quantity and quality management.

Keywords

References

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