한국해양환경ㆍ에너지학회지 (Journal of the Korean Society for Marine Environment & Energy)

  • 제18권2호
  • /
  • Pages.81-93
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  • 2015
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  • 2288-0089(pISSN)
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  • 2288-081X(eISSN)
한국해양환경•에너지학회 (The Korean Society for Marine Environment and Energy)
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새만금호 내 밀도 성층 변화 고찰

Consideration on Changes of Density Stratification in Saemangeum Reservoir

  • 오찬성 (한국농어촌공사 농어촌연구원) ;
  • 최정훈 (한국농어촌공사 농어촌연구원)
  • Oh, Chan-Sung (Future Policy Research Group, Rural Research Institute, Korea Rural Community Corporation) ;
  • Choi, Jung-Hoon (Future Policy Research Group, Rural Research Institute, Korea Rural Community Corporation)
  • 투고 : 2014.10.13
  • 심사 : 2015.04.02
  • 발행 : 2015.05.25
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초록

2010년 11월부터 새만금 내부개발을 위한 단계적 관리수위 적용이 실시되었으며, 이에 따른 수온 및 염분 변화 등을 파악하고자 현장 수질 모니터링 보완에 대한 필요성이 대두되었다. 한국농어촌공사에서는 월 3~4회에 걸쳐 총 25개 지점에서 염분 및 수온 자료를 관측 분석하고 있다. 본 연구에서는 상기 자료를 활용하여 계절적 성층수괴 분포 특성을 연도별로 비교하였으며, 관측한 자료는 크리깅을 이용하여 그 분포 특성을 파악하였다. 이 때 수온 및 염분 자료를 통한 ${\sigma}_t$와 성층계수를 함께 계산하였으며, 여러 관측 지점 중 M4와 D4 지점을 선정하여 월별 수직적인 수온, 염분 및 ${\sigma}t$ 변화 양상을 분석하였다. 2011년 및 2012년의 수온-염분 모니터링 비교 결과, 수온은 두 기간 동안 수직적 성층 현상은 여름철에 일시적으로 발생하였으며, 수층 상 하 간의 온도차는 약 $2{\sim}3^{\circ}C$로 성층 강도는 크지 않은 것으로 판단된다. 염분 농도는 표층에서 저층으로 갈수록 염분 농도가 높아지며, 여름철 표층에서 낮은 염도를 보이는 동일한 경향을 갖는다. 하지만 전반적으로 2012년의 염분 농도가 2011년에 비해 높은 분포를 보이며, 수심 5 m 이내에서 농도가 급변하는 현상이 나타난다. 따라서 밀도 변화는 주로 풍수기 기간에 집중되는 현상이 나타나, 성층현상은 하구 지역의 여름철 상류유입량에 매우 민감하게 반응하는 것으로 나타난다.

The comprehensive master plan in November 2010 on Saemangeum internal development has been released, and there is a need for complementary measures related to in-situ monitoring methods in order to acquire water temperature (T) and salinity (S) data. Thus, these data are monitored and analyzed by Korea Rural Community Corporation continuously. The purposes of current study are to evaluate the distributions of seasonal T and S, sigma-t, and stratification parameter and to compare annual stratification system in 2011 and 2012. To achieve these objectives, monthly vertical changes of T, S, and sigma-t, which are reproduced by a kriging technique, have been analyzed. In summer, the temperature difference between surface and bottom layers varies from 2 to $3^{\circ}C$, and the stratification of T is considerably weak. The stratification of S occurs abruptly within depth of EL. (-)5 to EL. (-)10 m. Therefore, stratification is induced by sudden increasing of water inflow amount due to a localized downpour during the rainy season, and these stratification processes are strongly influenced by inflowing a fresh water from watersheds in estuary environment.

키워드

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