영상강 하구언에서 저 산소 층의 제거를 위한 해양방류구의 효과
Effects of Ocean Outfall for Elimination fo the Anoxic Layer in Youngsan River Estuary
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여름에기본적으로방조제내부로부터담수의유입으로발생된저산소수괴가저서생물의감소를야기시키기때문에영산강하구언에서저산소층의제거에대한관심이증폭되어왔다. 처리된하폐수를해양에 방류하는해양방류시스템이이러한저산소층을제거하는효율적이고경제적인방법으로이용되어질수있다. 본 연구에서는근역에서방류된부력제트의거동을예측하고자적절한방류구의설계가제안되었다. 신뢰할수있는 부력제트의거동에대한계산을수행하기위하여측정된 CTD 와해류자료등을포함한인자들이고려되어졌다. 조석의주기에따라계산된부력제트의경계내에염분도와용존산소의횡분포의변화를예측하고자여러수치 모형중의하나로 EPA 에의해승인된 CORMIX 1 모형을사용하였다. 수치실험의결과를기준으로볼때단공방류구가저산소층을제거하는데유용한시스템임을알수있었다. 원활한주변수의조건을만족시키기위하여 적절한전략이또한제안되어졌다.
Abstract
because the anoxic water mass caused mainly by the inflow of fresh water from the sea wall might cause themass reduction of benthos during summer. An ocean outfall system to discharge treated wastewater into seawater may be used as one of the effective and economical ways to eliminate the anoxic layer. The suitable oceanoutfall design is generally proposed for the prediction of the buoyant jet behavior in the near field. Theparameters including CTD and current data are taken into account for more reliable buoyant jet behaviortrajectorial variation of the cross-sectional salinity and DO concentration distribution the calculated buoyantjet boundary according to the tidal periods. On the basis of the results, it is sugested that the single port outfallis a useful system to eliminate the anoxic layer. Proper strategies are also proposed for achieving desirableambient conditions.
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