上甑島浦内湾における「あびき」の現地観測 Field Observation of Secondary Undulation "Abiki" in Urauchi Bay, Kami-Koshiki Island

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Abstract

A long term field observation was conducted on the secondary undulations locally called "Abiki" occurred in Urauchi-bay, Kami-Koshiki Island. A comprehensive observation deployment for the sea level, current and barometric pressure was taken covering not only inside and nearby Urauchi-bay but also offshore field in the East China Sea. Vigorous secondary undulations greater than 150cm were happened over 5 days during 82 days' observation period. Just before the Abiki events, the atmospheric disturbances were found to travel eastward or north-eastward at a speed around 140km/h, which was resonantly coupled with the ocean wave in the offshore site. The observed Abiki heights can roughly be explained by the forced resonance in the offshore and the amplification after entering the bay.

Journal

  • Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering) 67(2), I_176-I_180, 2011

    Japan Society of Civil Engineers

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