Hydraulic experiments are carried out to clarify fundamental characteristics of fluid force on a large structure due to an inundated flow caused by a tsunami. Impulsive force at an early stage, and drag force, buoyancy and uplift pressure at a quasi-steady stage after the early stage are taken up as the fluid force. Dependency of drag coefficient on hydraulic quantities and opening ratio of structures is also examined.
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MATSUTOMI et al. (2004) studied this question.