Assessment of the Water Quality of Jungnang Stream by Flow Conditions Using Load Duration Curve

부하지속곡선을 이용한 중랑천의 유량 조건별 수질특성 평가

Choi, Kyung-Wan;Shin, Kyung-Yong;Lee, Hyung-Jin;Jun, Sang-Ho

  • Received : 2012.09.03
  • Accepted : 2012.10.15
  • Published : 2012.10.31


Objective: The objective of this study was to suggest a method through which load duration curve was used to assess the achievement of water quality targets in accordance with the criteria for pollutant load depending on flow rate variation. Methods: The stage-discharge curve and flow duration curve of Jungnang Stream were deduced. Using water quality targets and measurement of the stream, the flow duration curve was also drawn. Based on these, the feasibility of achievement of water quality targets in respect to flow rate was assessed. Results: In terms of the load duration curve of the stream, it was observed that excess of criteria for concentrations of $BOD_5$, $COD_{Mn}$ and SS frequently occurred. On the other hand, when the flow rate was low, the concentrations of T-N and T-P exceeded the criteria. Conclusions: Through the load duration curve, the overall water quality of Jungnang Stream was understood. When the flow rate is high, management of point source of $BOD_5$, $COD_{Mn}$ and SS is needed to achieve water quality targets for Jungnang Stream. On the other hand, when the flow rate is low, the management of non-point source T-N and T-P is necessary to attain the water quality goal.


jungnang stream;load duration curve;pollutant load;water quality


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