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Abiki oscillations in Sakitsu Bay, west Kyushu, Japan

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Abstract

Sakitsu and Yokaku bays in Amakusa in west Kyushu, Japan, experienced inundation damage in the February 2009 meteotsunami (Abiki) event. The oscillation characteristics of both bays are investigated by taking field measurements and conducting numerical experiments with regard to flood mitigation with the aim to reduce the flood impact during Abiki events. A continuous wavelet transform and bandpass filtering both of the pressure and water level indicated that a sequence of pressure disturbances, as small as 1.0 hPa, caused the large amplified oscillation within Sakitsu Bay. When a sequence of ocean long waves entered the bay, a surf beat evolved in the early stages. Subsequently, the sea level began to undergo large amplitude oscillations, and there was a secondary peak of oscillation with a period of around 24 min, as seen in both field measurements and numerical experiments. A surf beat with the period of 12 min formed in Yokaku Bay owing to the continuous incidence of ocean waves with period of 12 min, but its wave period was almost half of that of the natural period of the bay. This surf beat may have entered Sakitsu Bay with natural period of 11.8 min and caused large water-level fluctuations.

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Acknowledgments

This work was supported financially by JSPS KAKENHI, under grant numbers 23360217 and 25278124. The Amakusa City Office, Kumamoto Prefectural Office, and the Fishery Cooperative Association of Sakitsu cooperated in obtaining the measurements.

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Authors and Affiliations

  1. Department of Global Environment Studies, Hiroshima Institute of Technology, Hiroshima, Japan

    Kenji Tanaka

  2. Department of Civil and Environmental Engineering, Graduate School of Science and Technology, Kumamoto University, Kumamoto, Japan

    Shinichiro Gohara, Takayuki Koga & Fumihiko Yamada

  3. Japan Port Consultants, Kyushu Branch, Fukuoka, Japan

    Ryuta Yamaguchi

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  1. Kenji Tanaka
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  2. Shinichiro Gohara
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  3. Takayuki Koga
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  4. Ryuta Yamaguchi
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  5. Fumihiko Yamada
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Correspondence to Kenji Tanaka.

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Tanaka, K., Gohara, S., Koga, T. et al. Abiki oscillations in Sakitsu Bay, west Kyushu, Japan. Nat Hazards 74, 233–250 (2014). https://doi.org/10.1007/s11069-013-0959-5

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  • DOI: https://doi.org/10.1007/s11069-013-0959-5

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