東シナ海上の気象擾乱に起因する浦内湾における副振動の発生特性に関する数値解析

書誌事項

タイトル別名
  • Numerical Analysis on Characteristics of Secondary Undulation in Urauchi Bay caused by Meteorological Disturbances over the East China Sea
  • 人工海藻による海浜変形制御
  • ヒガシシナ カイジョウ ノ キショウ ジョウラン ニ キイン スル ウラ ナイワン ニ オケル フクシンドウ ノ ハッセイ トクセイ ニ カンスル スウチ カイセキ

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抄録

Secondary undulations locally called "Abiki" are frequently observed in Urauch Bay in Koshiki Islands. A meteorological disturbance over the East China Sea has been pointed out as the cause of the secondary undulations. In this study, response characteristics of the East China Sea to propagating pressure waves and the oscillation property of Urauch Bay were evaluated by numerical analyses. As the result, it is clarified that pressure waves with phase velocity of 80-140 km/h and spatial scales of 10-40km lead to large fluctuations of water level which have the periods close to the natural period of Urauch Bay. The waves close to the natural period not only set up resonance in the bay but also produce oscillations with a half period of incident waves in Urauch Bay.

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