Journal of the Korean Society of Marine Environment & Safety (해양환경안전학회지)

The Korean Society of Marine Environment and safety (해양환경안전학회)
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Assessment of Permissible Inflow Load for Water Quality Management in Yeoja Bay, Korea

여자만의 수질관리를 위한 허용유입부하량 산정

  • Received : 2011.10.19
  • Accepted : 2011.12.26
  • Published : 2011.12.31
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Abstract

Based on the consideration of land based pollutant discharges from the basin and seawater quality related carrying capacity and the seawater quality improvement in receiving water bodies of Yeoja Bay where eutrophication and organic pollution are in progress, were evaluated. The permissible inflow loads of BOD, TN and TP by using the geographical features and box modelling method were estimated. As results, it is shown that the reduction rate of discharged BOD and TP loads were 39.3% and 30.8 %, respectively, however, 6.9% was estimated for TN. According to the pollutant loading in each tributary and generated load of the basin, it is given much weight on the land use group, and also was shown in discharged load estimation. This suggests that it is important to control nonpoint source pollutant such as livestock and land use groups as well as point source to contribute the proposition of the water quality improvement plan according to the characteristics of the bay.

여자만은 유기물 오염이 점차 진행되어 가고 있으며, 해역의 수질관리를 위하여 유역으로부터 유입하는 육상기인 오염물질을 GIS 기법을 이용하여 발생부하량과 배출부하량을 산정하였다. 목표수질을 달성하기 위해 해역의 환경용량을 초과하여 유입하는 육상오염물질의 양을 박스모델로 계산하여 삭감부하량과 허용유입부하량을 평가하였다. 여자만의 수질을 해역생활환경기준 I등급으로 회복하기 위한 허용부하량을 산정한 결과, 생물화학적산소요구량은 배출부하의 39.3%, 총인은 30.8%를 삭감해야 하고, 총질소의 경우 6.9%의 낮은 배출부하 삭감률을 나타내었다. 유역의 오염원 현황과 발생부하량 현황을 볼 때 토지계가 차지하는 오염부하 비중이 높고, 배출부하량에서도 가장 큰 비중을 차지하였다. 여자만의 해양환경 보호와 개선을 위해서는 육상기원 오염물질 중 점오염원 뿐만 아니라 축산계 및 토지계 부하 등 비점원 오염원에 대한 관리가 필요하다는 것을 시사한다.

Keywords

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