Journal of the Korean earth science society (한국지구과학회지)

The Korean Earth Science Society (한국지구과학회)
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Model Optimization for Sea Surface Wind Simulation of Strong Wind Cases

강풍 사례의 해상풍 모의를 위한 모형의 최적화

  • Heo, Ki-Young (Division of Earth Environmental System, Pusan National University) ;
  • Lee, Jeong-Wook (Division of Earth Environmental System, Pusan National University) ;
  • Ha, Kyung-Ja (Division of Earth Environmental System, Pusan National University) ;
  • Jun, Ki-Cheon (Coastal Engineering Research Division, Korea Ocean Research and Development Institute) ;
  • Park, Kwang-Soon (Coastal Engineering Research Division, Korea Ocean Research and Development Institute)
  • 허기영 (부산대학교 지구환경시스템학부) ;
  • 이정욱 (부산대학교 지구환경시스템학부) ;
  • 하경자 (부산대학교 지구환경시스템학부) ;
  • 전기천 (한국해양연구원 연안방재연구사업단) ;
  • 박광순 (한국해양연구원 연안방재연구사업단)
  • Published : 2008.06.30
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Abstract

This study is concerned with the optimization of models using MM5 and WRF mesoscale numerical models to simulate strong sea surface winds, such as that of typhoon Shanshan on 17 September 2006, and the Siberian high event on 16 December 2006, which were selected for displaying the two highest mean wind speeds. The model optimizations for the lowest level altitude, physical parameters and horizontal resolution were all examined. The sea surface wind values obtained using a logarithmic function which takes into account low-level stability and surface roughness were more accurate than those obtained by adjusting the lowest-level of the model to 10 m linearly. To find the optimal parameters for simulating strong sea surface winds various physical parameters were combined and applied to the model. Model grid resolutions of 3-km produced better results than those of 9-km in terms of displaying accurately regions of strong wind, low pressure intensities and low pressure mesoscale structures.

이 연구에서는 2006년 9월 17일의 태풍 산산과 2006년 12월 16일의 시베리아 고기압 확장에 의한 강풍 사례에 대하여 MM5와 WRF 중규모 수치 모형을 이용한 실험을 통해 강한 해상풍을 모의하기 위한 모형의 최적화가 조사되었다. 모형의 최적화는 모형의 최하층 고도, 물리 모수화, 모형 해상도에 대해 조사되었으며, 결과를 요약하면 다음과 같다. 1) 두 사례 모두 최하층 연직 고도를 해상풍 관측 고도인 10m가지 선형적으로 내리는 것보다 대기 하층의 안정도와 해수면 거칠기를 고려하여 로가리듬의 함수로 변환하는 것이 더 정확한 모의를 하였다. 2) 강한 해상풍 모의를 위한 최적의 모수화 방안을 찾기 위해, 여러 물리 모수화 방안을 조합하여 모형에 적용하였다. 3) 3-km의 고분해능의 모형 결과가 9-km 분해능의 모형 결과에 비해 강풍 지역과 저기압의 강도와 같은 저기압의 중규모 구조를 잘 나타내었다.

Keywords

References

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