EXPERIMENTAL STUDY ON FAILURE CHARACTERISTICS OF TOE PROTECTION WORKS FOR COASTAL DIKES DUE TO TSUNAMI OVERFLOW IN EARLY IMPULSIVE STAGE

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  • 津波越流による海岸堤防裏法尻保護工の衝撃時の被災特性に関する実験的研究
  • ツナミエツリュウ ニ ヨル カイガン テイボウリホウジリ ホゴコウ ノ ショウゲキジ ノ ヒサイ トクセイ ニ カンスル ジッケンテキ ケンキュウ

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Abstract

 Tenacious structures for mitigating devastating disaster of tsunami overflows have been recently required for coastal dikes in Japan. As one of the hard countermeasures, it is suggested to install landward toe protection works. However, hydrodynamic characteristics of impulsive forces acting on the works in tsunami overflows have not been clarified thoroughly in previous studies.<br> In this study, we experimentally investigated the impulsive forces affecting on failures of the works, which occur at an early stage of tsunami overflows. In the experiments, four types of concrete blocks were used for the landward slope and toe protection works, and we systematically changed the tsunami height and the block type used for the works. For each experimental case, we took videos of the corresponding failure. We also measured drag, lift forces, and moments acting on the blocks.<br> Results showed that the upward force observed during a very short time after tsunami flow lands on the blocks is the key factor triggering the washout of the toe protection works. The results also showed that the location of the block flowing out firstly from the works is approximately determined by the tsunami height and the block type.

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