Journal of Environmental Science International (한국환경과학회지)

The Korean Environmental Sciences Society (한국환경과학회)
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A Study on the Meteorological Threshold of the Meteo-Tsunami Occurrence in the Yellow Sea, Korea

기상해일사례분석을 통한 기상해일발생 임계조건 도출

  • Choi, Yo-Hwan (Division of Earth Environmental System, Pusan National University) ;
  • Kim, Hyunsu (Division of Environmental and Sustainability, The Hong Kong University of Science and Technology) ;
  • Woo, Seung-Buhm (Department of Oceanography, Inha University) ;
  • Kim, Myung-Seok (Department of Oceanography, Inha University) ;
  • Kim, Yoo-Keun (Department of Atmospheric Environmental Science, Pusan National University)
  • 최요환 (부산대학교 지구환경시스템학부) ;
  • 김현수 (홍콩과학기술대학교 환경과학부) ;
  • 우승범 (인하대학교 해양과학과) ;
  • 김명석 (인하대학교 해양과학과) ;
  • 김유근 (부산대학교 대기환경과학과)
  • Received : 2017.10.23
  • Accepted : 2017.12.19
  • Published : 2018.01.31
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Abstract

Both the propagation velocity and the direction of atmospheric waves are important factors for analyzing and forecasting meteo-tsunami. In this study, a total of 14 events of meteo-tsunami over 11 years (2006-2016) are selected through analyzing sea-level data observed from tidal stations along the west coast of the Korean peninsula. The propagation velocity and direction are calculated by tracing the atmospheric disturbance of each meteo-tsunami event predicted by the WRF model. Then, the Froude number is calculated using the propagation velocity of atmospheric waves and oceanic long waves from bathymetry data. To derive the critical condition for the occurrence of meteo-tsunami, supervised learning using a logistic regression algorithm is conducted. It is concluded that the threshold distance of meteo-tsunami occurrence, from a propagation direction, can be calculated by the amplitude of air-pressure tendency and the resonance factor, which are found using the Froude number. According to the critical condition, the distance increases logarithmically with the ratio of the amplitude of air-pressure tendency and the square of the resonance factor, and meteo-tsunami do not occur when the ratio is less than 5.11 hPa/10 min.

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References

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