衝撃砕波圧の発達メカニズムの解明に向けた基礎的研究

抄録

In this study, the mechanism to produce impact pressure on a wall under fresh water and sea water jets is experimentally investigated through water drop tests. The effects of entrapped air, which is a model of an air pocket formed at coastal structure under breaking waves, are also discussed. Higher impact pressure is found to occur under sea water jets rather than fresh water jet for all cases. It is also found that the entrapped air has a role to reduce the pressure maximal and to change peak frequencies of the impacts. New model to estimate variations of the impact pressure with coefficients determined through the experiments is proposed. It is roughly applicable to estimate the maximum pressure and the duration of the impacts under the jets.