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イベント開催のご案内
- [日 時]
- ２０１４年８月１８日（月） １３時３０分 ～
- [場 所]
- 応用力学研究所西棟 W501セミナー室
- [題 目]
- Semidiurnal perturbations to the surge of hurricanes affecting the eastern United States
- [講演者]
- Prof. Anatoli Borovoi（Institute of Atmospheric Optics, Russian Academy of Sciences）
- [Abstract]
- The main message of this talk is that "storm surges can get the 'wiggles'." Hurricane Sandy drove storm surges throughout the eastern seaboard of the United States, from Miami to Maine, at the end of October 2012. The surge was particularly high (> 3 m) in coastal New York. In the southeastern United States, the surge was < 1 m but had striking semidiurnal perturbations that reached a range of ~0.5 m in northern Florida and southern Georgia. These oscillations are typically not considered in surge forecasts and their origin needs to be understood for future forecasts. Analytical and numerical approaches indicated that semidiurnal perturbations arose from an interaction between astronomical tide and wind forcing. This combination of forcing caused phase shifts between incident and reflected tidal waves that customarily produce quasi-standing tidal conditions in the area. Atmospheric forcing of sufficient strength, which threshold remains to be established, disrupted such quasi-standing tidal behavior through Coriolis accelerations and triggered the semidiurnal perturbations.
- [世話人]
- 地球環境力学部門 海洋動態解析分野
松野 健
[ セミナー ]
各 位
現在、東アジア研究センターの訪問教授として、滞在中の Arnoldo Valle-Levinson 教授 (University of Florida ) のセミナーを下記のように行いますので、ご案内いたします。米国東海岸における、潮汐と連動したハリケーンによる高潮の話です。特に高潮予報で予測できなかった半日周期の振動などに 注目した話かと思います。興味のある方の参加をお待ちします。
