• 제목/요약/키워드: Total maximun daily load

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Assessment of Pollution Levels in the Jangsungcheon Watershed Using Load Duration Curves and Analysis of the Causes

  • Cho, Sohyun;Bak, Jonghun;Lee, Yeong Jae;Kim, Kyunghyun;Jung, Kang Young
    • 한국환경과학회지
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    • 제28권10호
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    • pp.873-885
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    • 2019
  • In this study, a load duration curve was applied to the Jangseongcheon, one of the tributaries of the Yeongsan River, to assess whether the target water quality was achieved. In addition, pollution of the water body was investigated to develop and suggest the optimal management time with respect to polluted flow sections and monthly conditions. The average flow rates of sections JS1 and JS2 were $0.25m^3/s$ and $1.08m^3/s$, respectively. The BOD and T-P for water-quality standards at JS1 were rated at II, whereas the COD and TOC were rated at III, thus indicating a fair level of water quality. By contrast, the BOD at JS2 was rated at III, the T-P at IV, and the TOC at V, indicating poor water quality in this section. The load duration curve was plotted using the actual flow data measured in eight-day intervals for eight years from 2011 to 2018 at locations JS1 and JS2 in the Jangsungcheon Basin. In an assessment using the load duration curve on whether the target water quality was met at location JS1, all of the water quality parameters (BOD, COD, TOC, T-N, T-P, and SS) satisfied the target water quality. By contrast, at location JS2, parameters COD, TOC, T-N, and T-P exceeded target values by more than 50%, indicating the target water quality was not met. The discharge loads of locations JS1 and JS2 were analyzed to identify the reasons the target water quality was exceeded. Results revealed that the land system contributed considerably. Furthermore, the discharge load of JS2 accounted for more than 80% of the load on the entire basin, excluding that of JS1. Therefore, the best method for restraining the inflow of pollutants into the stream near location JS2 must be applied to manage the water quality of the Jangsungcheon.

오염원 공간분석 및 오염부하지속곡선을 통한 맞춤형 수질오염총량제 추진방안 연구 (Study on the Application of Spatial-analysis of Pollutants and Load Duration Curve for Efficient Implementation of TMDLs system)

  • 박배경;류지철;나은혜;서지연;김용석
    • 대한환경공학회지
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    • 제39권12호
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    • pp.655-663
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    • 2017
  • 현재 수질오염총량제(이하 총량제)에서는 단위유역 말단의 목표수질만 만족할 수 있는 조건에서의 유역 관리를 진행해 왔으며 이로 인해 우선관리가 필요한 지류에 대한 집중적 관리와 오염원 공간분포 특성을 고려한 삭감대책을 마련하는데 제한점이 있다. 본 연구에서는 이러한 문제를 해결하기 위하여 장기적으로 조사된 유량 및 수질자료를 이용한 오염부하지속곡선 기법과 오염원 및 오염부하량 공간분포 특성 분석 방법을 현행 총량제 이행평가 방법으로 적용하였다. 적용유역은 기존 총량제가 시행되고 있는 진위천 수계를 대상으로 하였다. 본 연구방법 적용 결과, 진위천 수계에서는 황구지천 지류가 집중 관리 되어야 하며 진위천 지류는 우선관리에서 제외되는 것으로 나타났다. 또한 황구지천 중류 구간에서 추가적으로 비점삭감계획이 필요하며, 하류 구간에서는 축산에 대한 저감대책이 필요할 것으로 분석됐다. 본 연구에서 제안한 새로운 방법은 향후 총량제에서 유역 전체의 건강성을 높이는데 매우 효과적으로 사용될 수 있을 것으로 판단된다.