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

Korean Society of Coastal and Ocean Engineers (한국해안·해양공학회)
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A Study on the behavior of bottom water in water area by using modified POM

개량형 POM을 이용한 수역에서의 저층수의 거동에 관한 연구

  • Yoon Jong-Sung (Department of Civil Engineering, Inje University) ;
  • Lee Dong-Ken (Department of Civil Engineering, Inje University) ;
  • Kim In-Cheol (Department of Civil Engineering, Dongseo University)
  • Published : 2006.09.01
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Abstract

POM(Princeton Ocean Model) was utilized in this study because it took ${\sigma}-coordinate$ system which could predict the behavior of bottom water. The model has been increasingly applied to costal area although it was initially developed as the ocean flow model. The original POM did not correct computational errors in transformation of ${\sigma}-coordinate$ system. The trying to reduce conversional errors might improve accuracy of flow velocity in vicinities of bottom layer. Therefore, in this study it was proposed to modify the original POM by using error correction method suggested by $Sl{\Phi}rdal$(1997). The modified POM was applied to Young-rang Lake, one of the typical brackish lakes in Korea. It was found that the behavior of bottom water could be well predicted. Thus, it seems that the modified POM can be used as a useful tool to clarify the mechanism of formation and behavior of bottom water including oxygen-deficient water mass.

본 연구에서 이용한 3차원 유동모델인 POM(Princeton Ocean Model)은 저층수의 거동예측에 유리한 ${\sigma}$ 좌표계를 채용하고 있는 모델로서 범용성이 높고, 해양유동모델로서 개발되었지만 최근에는 연안역에서의 적용 예(박경 등, 1998)도 증가하고 있다. 기존의 POM은 ${\sigma}$좌표계 모델의 좌표변환에 기인한 수치오차에 대한 보정을 실시하지 않은 모델로서, 이러한 수치오차를 축소시키는 것은 저층부근의 유속의 정도향상에 매우 중요하지만 오차의 축소를 시도하지 않고 그대로 적용하고 있는 실정이다. 따라서, 본 연구에서는 $Sl{\Phi}rdal$(1997)이 제안한 방법을 이용하여 오차보정을 통한 3차원 유동모델인 POM의 정도향상을 실시하였다. 구축된 모델을 이용하여 우리나라의 대표적인 기수호중 하나인 영랑호에 적용하여 저층수의 거동을 파악하고 빈산소수괴를 포함한 저층수의 거동 및 형성기구를 명확히 할 수 있는 자료로서 활용하고자 하였다. 적용결과, 기존 POM모델과 비교하여 개량형 POM모델을 이용하였을 경우 수역에서의 저층수의 거동재현에 있어서 더욱 효과가 있음을 볼 수 있었다.

Keywords

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