Journal of Environmental Science International (한국환경과학회지)

The Korean Environmental Sciences Society (한국환경과학회)
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Development of Long Term Flow Duration Curves for the Management of Total Maximum Daily Loads - in the Nakdong River Basin -

수질오염총량관리 단위유역 장기유황곡선 구축 -낙동강수계를 대상으로-

  • Kim, Gyeong hoon (Nakdong River Environment Research Center, National Institute of Environmental Research) ;
  • Kwon, Heon gak (Nakdong River Environment Research Center, National Institute of Environmental Research) ;
  • Ahn, Jung min (Nakdong River Environment Research Center, National Institute of Environmental Research) ;
  • Kim, Sanghun (Nakdong River Environment Research Center, National Institute of Environmental Research) ;
  • Im, Tae hyo (Nakdong River Environment Research Center, National Institute of Environmental Research) ;
  • Shin, Dong seok (Nakdong River Environment Research Center, National Institute of Environmental Research) ;
  • Jung, Kang-Young (Nakdong River Environment Research Center, National Institute of Environmental Research)
  • 김경훈 (국립환경과학원 낙동강물환경연구소) ;
  • 권헌각 (국립환경과학원 낙동강물환경연구소) ;
  • 안정민 (국립환경과학원 낙동강물환경연구소) ;
  • 김상훈 (국립환경과학원 낙동강물환경연구소) ;
  • 임태효 (국립환경과학원 낙동강물환경연구소) ;
  • 신동석 (국립환경과학원 낙동강물환경연구소) ;
  • 정강영 (국립환경과학원 낙동강물환경연구소)
  • Received : 2017.06.03
  • Accepted : 2017.07.11
  • Published : 2017.08.31
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Abstract

For the development of flow duration curves for the management of 41 Total Maximum Daily Load (TMDL) units of the Nakdong River basin, first, an equation for estimating daily flow rates as well as the level of correlation (correlation and determination coefficients) was extrapolated through regression analysis of discrete (Ministry of Environment) and continuous (Ministry of Land, Infrastructure and Transportation) measurement data. The equation derived from the analysis was used to estimate daily flow rates in order to develop flow duration curves for each TMDL unit. By using the equation, the annual flow duration curves and flow curves, for the entire period and for each TMDL unit of the basin, were developed to be demonstrated in this research. Standard flow rates (abundant-, ordinary-, low- and drought flows) for major flow duration periods were calculated based on the annual flow duration curves. Then, the flow rates, based on percentile ranks of exceedance probabilities (5, 25, 50, 75, and 95%), were calculated according to the flow duration curves for the entire period and are suggested in this research. These results can be used for feasibility assessment of the set values of primary and secondary standard flow rates for each river system, which are derived from complicated models. In addition, they will also be useful for the process of implementing TMDL management, including evaluation of the target level of water purity based on load duration curves.

Keywords

References

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