CHARACTERISTICS OF SEA CURRENT UNDER TYPHOONS DUE TO LONG-TERM FIXED OBSERVATIONS IN AMITORI BAY, IRIOMOTE ISLAND
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- ISHIKAWA Ayano
- 岩手大学 総合科学研究科地域創生専攻
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- OGASAWARA Toshinori
- 岩手大学 理工学部システム創成工学科
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- MURAKAMI Tomokazu
- （国研）防災科学技術研究所 水・土砂防災研究部門
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- KOHNO Hiroyoshi
- 東海大学 沖縄地域研究センター
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- MIZUTANI Akira
- 東海大学 沖縄地域研究センター
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- SIMOKAWA Shinya
- （国研）防災科学技術研究所 水・土砂防災研究部門
Bibliographic Information
- Other Title
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- 西表島網取湾における長期定点観測による台風時の海水流動特性
- イリオモテジマモウシュワン ニ オケル チョウキ テイテン カンソク ニ ヨル タイフウジ ノ ウミ ミズリュウドウ トクセイ
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Abstract
<p> In the global warming scenario A1B, a powerful intensity typhoon causes not only strong wind but also high tide in coastal areas. To improve the accuracy of the storm surge forecast simulation, it is necessary to correctly evaluate the wind drag coefficient, which represents the shear stress acting on the sea surface from the wind. However, it is uncertain whether the bulk formula of the wind drag coefficient based on the past typhoons is suitable for the storm surge caused by a strong typhoon. From this situation, we require the observation data of many typhoons generated by global warming.</p><p> In this study, we study the characteristics of currents under a typhoon, which is comparable to a strong typhoon during warming, based on data obtained from long-term observations over four years at Amitori Bay, Iriomote Island, Okinawa Prefecture. The fixed observation of velocity and waves used a WavesADCP. As a result, it was clarified that the flow velocity and the momentum transport depends on the typhoon path even if the typhoon has a wind speed exceeding 25 m/s.</p>
Journal
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- Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)
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Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering) 76 (2), I_127-I_132, 2020
Japan Society of Civil Engineers