CHARACTERISTICS OF AMPLITUDES AND PERIODS OF SEICHES OBSERVED AROUND JAPAN

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  • SAMESHIMA Kazunori
    国土交通省 国土技術政策総合研究所 沿岸防災研究室
  • NAKAI Keiji
    株式会社エコー 事業管理部
  • NAITO Ryoji
    国土交通省 国土技術政策総合研究所 沿岸海洋・防災研究部
  • KAWAGUCHI Koji
    国立研究開発法人海上・港湾・航空技術研究所 港湾空港技術研究所 海象情報研究グループ
  • NUKADA Kyoshi
    株式会社エコー 海象解析部
  • HASHIMOTO Noriaki
    九州大学大学院 工学研究院 附属アジア防災研究センター

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Other Title
  • 全国沿岸における副振動の振幅と周期の出現特性
  • ゼンコク エンガン ニ オケル フクシンドウ ノ シンプク ト シュウキ ノ シュツゲン トクセイ

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 A survey has been carried out on characteristics of amplitudes and periods of seiches observed around Japan.<br> The larger is the mean period, the smaller is the standard deviation of normalized amplitudes. The averaged normalized amplitude asymptotically approaches 1.0 as the frequency of normalized periods increases not depending on stations or periods.<br> Nakai et al.(2017) classified 65 tidal stations of JMA(Japan Meteorological Agency) into three types with the sharpness of probability density functions of seiche amplitudes and the similarity coefficients of seasonal variations. In this paper, probability density functions of five stations of the Ports and Harbours Bureau have been calculated and they showed good agreement with Type A proposed by Nakai et al.(2017). It became clear by analyzing the data of the Ports and Harbours Bureau that as for stations whose amplitudes are small, the probability functions calculated with data more than 5 cm do not necessarily express the true values.

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