RESEARCHES OF THE SHOCK PRESSURES OF BREAKING WAVES ON BREAKWATERS

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  • Nagai Shoshichiro
    社團法人土木學會 工学博士, 大阪市立大学, 工学部土木工学教室

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  • 防波堤に働く砕波の圧力に関する研究
  • ボウハテイ ニ ハタラク サイハ ノ アツリョク ニ カンスル ケンキュウ

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Abstract

The present paper describes the results of the studies of the shock pressures caused by breaking waves on composite-type breakwaters conducted from April 1956 to March 1959. Such hitherto unknown problems as relationships between wave profiles and pressures from instant to instant in plunging of breaking waves to the breakwaters, the velocities of water particles in the breakers, and the behaviours of air bubbles entrained in them, were clarified by the synchronised use of a 16 millimeter high speed movie camera taken at a rate of 3000 frames per second and an electro-magnetic oscillograph.<br>Formulas for the prediction of the maximum shock pressure and the vertical distribution of the maximum simultaneous shock pressures were derived for the vertical walls of composite-type breakwaters.

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