A flap-gate breakwater is a coastal defense structure that ordinarilylies down on the seabed, and rises due to its buoyancy to form acontinuous seawall before a tsunami attack. Because the 2011 Tohokuearthquake tsunami seriously damaged many coastal defense structures,the resilience of these structures must be considered so they do notimmediately collapse against tsunamis exceeding design levels. In thisstudy, we examined resistance properties of the flap-gate breakwateragainst tsunamis through a series of hydraulic experiments using a flapgatemodel that could detect reaction forces from a rubble mound.In addition to this study, we conducted a field experiment to provethe flap-gate breakwater’s basic performance. The paper also describesthe results of this experiment.
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