Journal of Korean Society of Coastal and Ocean Engineers (한국해안해양공학회지)

Korean Society of Coastal and Ocean Engineers (한국해안·해양공학회)
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Effects of Ocean Outfall for Elimination of the Anoxic Layer in Youngsan River Estuary

영산강 하구언에서 저 산소 층의 제거를 위한 해양방류구의 효과

  • Kwon, Seok-Jae (Division of Civil, Urban & Geosystem Engineering, Seoul National University) ;
  • Cho, Yang-Ki (Faculty of Earth Systems and Environmental Science, Chonnam National University) ;
  • Seo, Uk-Won (Division of Civil, Urban & Geosystem Engineering, Seoul National University)
  • 권석재 (서울대학교 지구환경시스템공학부) ;
  • 조양기 (전남대학교 지구환경과학부) ;
  • 서일원 (서울대학교 지구환경시스템공학부)
  • Published : 2005.12.01
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Abstract

There has been a growing interest in the elimination of anoxic layer in the Youngsan River Estuarybecause the anoxic water mass caused mainly by the inflow of fresh water from the sea wall might cause the mass reduction of benthos during summer. An ocean outfall system to discharge treated wastewater into sea water may be used as one of the effective and economical ways to eliminate the anoxic layer. The suitable ocean outfall design is generally proposed for the prediction of the buoyant jet behavior in the near field. The parameters including CTD and current data are taken into account f3r more reliable buoyant jet behavior calculation. One of the numerical models, CORMIX 1, approved by EPA is used herein for the prediction of the trajectorial variation of the cross-sectional salinity and DO concentration distribution on the calculated buoyant jet boundary according to the tidal periods. On the basis of the results, it is suggested that the single port outfall is a useful system to eliminate the anoxic layer. Proper strategies are also proposed for achieving desirable ambient conditions.

여름에 기본적으로 방조제 내부로부터 담수의 유입으로 발생된 저 간소 수괴가 저서생물의 감소를 야기시키기 때문에 영산강 하구언에서 저 산소층의 제거에 대한 관심이 증폭되어왔다. 처리된 하$\cdot$ 폐수를 해양에 방류하는 해양방류시스템이 이러한 저 산소층을 제거하는 효율적이고 경제적인 방법으로 이용되어 질 수 있다. 본 연구에서는 근역에서 방류된 부력제트의 거동을 예측하고자 적절한 방류구의 설계가 제안되었다. 신뢰할 수 있는 부력제트의 거동에 대한 계산을 수행하기 위하여 측정된 CTD와 해류 자료 등을 포함한 인자들이 고려되어졌다. 조석의 주기에 따라 계산된 부력제트의 경계 내에 염분도와 용존산소의 횡분포의 변화를 예측하고자 여러 수치 모형중의 하나로 EPA에 의해 승인된 CORMIX 1 모형을 사용하였다. 수치실험의 결과를 기준으로 볼 때 단공방류구가 저 산소층을 제거하는데 유용한 시스템임을 알 수 있었다. 원활한 주변수의 조건을 만족시키기 위하여 적절한 전략이 또한 제안되어졌다.

Keywords

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