Variation of semidiurnal internal tides along the southeastern coast of korea induced by typhoons

Jeong Yeob Chae, Chanhyung Jeon, Pyeongjoong Kim, Naoki Hirose, Ahyoung Ku, Jae Hun Park

研究成果: Contribution to journalArticle査読

抄録

Typhoon-induced strong winds can dramatically change the oceanic environment, occa-sionally resulting in sudden stratification changes. In July 2015, two consecutive typhoons, Chanhom and Nangka, passed over the Yellow and East/Japan Seas within a week. Remarkable temperature variations were observed near the southeastern coast of Korea, caused by typhoon-induced upwelling and downwelling events, which altered the energy of semidiurnal internal tides. During the typhoon-induced downwelling event, the energy of semidiurnal internal tides near the southeastern coast of Korea varied independently from the barotropic tidal forcing. Data-assimi-lated numerical simulation results reveal that the pycnocline, which is typically tilted toward the coast, enables the semidiurnal internal tidal energy to propagate toward shallow regions after being generated off the coast. Meanwhile, the downwelling event deepens the pycnocline near the coast and reflects and concentrates the semidiurnal internal tide energy near the bottom off the coast. A simple mechanism using the ratio between the wave characteristic slope and the bottom slope is proposed to explain the observed variations of semidiurnal internal tide energy near the coast. This paper demonstrates a case study showing that typhoon passage can modify the energetics of internal tides, which has the potential to cause unusual short-term coastal environmental changes.

本文言語英語
論文番号328
ジャーナルJournal of Marine Science and Engineering
9
3
DOI
出版ステータス出版済み - 3 2021

All Science Journal Classification (ASJC) codes

  • 土木構造工学
  • 水の科学と技術
  • 海洋工学

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