IMPACT BREAKING WAVE PRESSURES ON VERTICAL WALLS

Masataro Hattori, Atsusi Arami

Abstract


Impact wave pressures acting on a vertical wall were discussed by simultaneous measurements of the pressure and wave shapes at impact. Experiments confirmed the principal role of adiabatic processes of trapped air bubbles to the generation of impact pressures. The most severe impulsive pressure was observed when breaking waves hit the wall with trapping small air bubbles or a very thin lensshaped air pocket. The larger the amount of the entrapped air, the lower the magnitude of the impact pressures. Due to the pulsation of the air pocket, damped pressure oscillations were observed immediately after the impact pressure. A predictive model, taking account of the adiabatic compression processes of the trapped air pocket, predicts fairly well the maximum impact pressure and the frequency of the damped pressure oscillation, in the case when plunging breakers collide against the wal1.

Keywords


vertical wall; impact breaking; wave pressure; breaking waves

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