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

Korean Society of Coastal and Ocean Engineers (한국해안·해양공학회)
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Numerical Simulation for Behavior of Tidal Elevation and Tidal Currents in the South Sea

남해안의 조위 및 조류거동 수치모의

  • 권석재 (해양수산부 국립해양조사원) ;
  • 강태순 ((주)지오시스템리서치)
  • Published : 2007.06.30
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Abstract

This study applied the previous results of the NAO model, a tidal correction model, to the open boundary condition for the behavior of tidal elevation and tidal currents in the South Sea. This study used the EFDC model considering the wetting and drying problem and using the $\sigma-coordinate$ as a vertical coordinate and generated two mesh cases of the constant grid size of 2.0 km and the variable grid size of $0.5\sim2.0km$. The numerical results for the tides showed that the predicted results were in quite good agreements with the observational data acquired from the tidal stations of the NORI. The predicted tides were observed to propagate from the east area to the west area in the South Sea. The verification results reveal that the numerical results are more correlated with the measured tidal data as the grid size decreases. The grid size of 2 km results in proper simulation of tidal currents in wide waterway and offshore area whereas the numerical results from the grid size of 0.5 km tend to somewhat underestimate the tidal currents affected by narrow waterway and topography in inner-bay.

본 연구의 대상영역인 남해안의 조위 및 조류 수치모의를 위해 조석 보정용 모델인 NAO.99의 기존결과를 외해 개방경계 조건에 적용하였다. 조간대를 고려할 수 있고 $\sigma$-좌표계를 사용하는 EFDC 모형을 이용하여 2 km의 직교 정격자와 $0.5\sim2.0km$의 가변직교격자를 사용한 두 개의 격자망을 구축하였다. 조위수치모의 결과에서 예측값과 국립해양조사원 조위검조소의 관측값이 잘 일치하였으며 남해안 동측에서 서측으로의 조석의 전파를 보여주었다. 검증 결과 격자크기가 감소할수록 조위관측 자료와 더 높은 상관관계를 보였으며 0.5 km의 격자크기로 인한 수치모의 결과가 내만의 협수로 및 지형의 영향을 크게 받는 조류를 다소 과소 산정하는 경향을 가지는 반면에 넓은 수로 및 외해역 자료의 경우에는 2 km 격자로 조류의 적절한 재현이 가능하였다.

Keywords

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