Inundation by meteotsunami in Nagasaki urban area on March 21, 2019

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  • TANAKA Kenji
    Department of Global Environment Studies. Hiroshima Institute of Technology

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  • 2019年 3 月21日に長崎市で発生した潮位副振動(あびき)による浸水被害について
  • 2019ネン 3ガツ 21ニチ ニ ナガサキシ デ ハッセイ シタ チョウイ フクシンドウ(アビキ)ニ ヨル シンスイ ヒガイ ニ ツイテ

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The large amplified secondary oscillation, locally called abiki, observed in Kyushu and San-in coastal area on 20 and 21 March 2019 as passed the extratropical cyclone. This paper reports on the inundation damages by abiki phenomenon over the urban area of Nagasaki. According to field survey, the water level as high as 2.3~2.6 m above Tokyo Peil (T.P.) in the downtown of Nagasaki, and 2.9 m T.P. in the downstream site of Urakami River. There seemed to be two-staged mechanisms of inundation in Nagasaki city: the backward flow through the culverts in the first stage, and the overflow from small rivers in the second stage.

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