Journal of the Korean earth science society (한국지구과학회지)

The Korean Earth Science Society (한국지구과학회)
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Evaluation of Surface Wind Forecast over the Gangwon Province using the Mesoscale WRF Model

중규모 수치모델 WRF를 이용한 강원 지방 하층 풍속 예측 평가

  • Seo, Beom-Keun (Applied Meteorological Research Division, National Institute of Meteorological Research) ;
  • Byon, Jae-Young (Global Environment System Research Division, National Institute of Meteorological Research) ;
  • Lim, Yoon-Jin (Applied Meteorological Research Division, National Institute of Meteorological Research) ;
  • Choi, Byoung-Choel (Forecast Research Division, National Institute of Meteorological Research)
  • 서범근 (국립기상과학원 응용기상연구과) ;
  • 변재영 (국립기상과학원 지구환경시스템연구과) ;
  • 임윤진 (국립기상과학원 응용기상연구과) ;
  • 최병철 (국립기상과학원 관측예보연구과)
  • Received : 2014.11.20
  • Accepted : 2015.02.18
  • Published : 2015.04.30
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Abstract

This study evaluates the wind speed forecast near the surface layer using the Weather Research Forecasting with Large Eddy Simulation (WRF-LES) model in order to compare the planetary boundary layer (PBL) parameterization with the LES model in terms of different spatial resolution. A numerical simulation is conducted with 1-km and 333-m horizontal resolution over the Gangwon Province including complex mountains and coastal region. The numerical experiments with 1-km and 333-m horizontal resolution employ PBL parameterization and LES, respectively. The wind speed forecast in mountainous region shows a better forecast performance in 333-m experiment than in 1-km, while wind speed in coastal region is similar to the observation in 1-km spatial resolution experiment. Therefore, LES experiment, which directly simulates the turbulence process near the surface layer, contributes to more accurate forecast of surface wind speed in mountainous regions.

큰 에디 모의과정을 포함한 WRF 모델 (WRF-LES)을 이용하여 수치모델의 수평공간 규모에 따른 대기경계층 모수화 실험과 LES 모의 결과를 지표층 근처의 풍속 예측에 대하여 비교하였다. 수치실험은 복잡한 산악지형과 해안지역을 포함하는 강원도 지역에서 수평해상도 1 km와 333 m 실험을 수행하였다. 수평해상도 1 km 실험은 대기경계층 모수화 방안을 채택하였으며, 333 m 실험에서는 LES를 이용하였다. 복잡한 산악지역에서의 풍속 예측의 정확성은 수평해상도 1 km 실험 보다 333 m 실험에서 향상되었으며 해안지역에서는 1 km 실험에서 관측과 더 일치하였다. 지표층 근처의 큰 난류를 직접 계산하는 LES 실험은 산악지역의 풍속예측 개선에 기여하였다.

Keywords

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