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Tsunami waves generated by the 2011 off the Pacific Coast of Tohoku Earthquake caused catastrophic damage to waterfront structures, such as breakwaters and sea walls. Countermeasures of compound disaster by future mega earthquake such us, Nankai megathrust earthquake and subsequent tsunami, are issues that should be resolved urgently. Therefore, the authors developed reinforcing technique of breakwater foundation using steel sheet piles and gabions that can minimize damage subjected to the tsunami higher than the design tsunami level. In this research, hydraulic model tests were performed to evaluate tsunami resistant characteristic of proposed reinforcing technique. Results of this research revealed that the settlement and the inclination of the caissons during tsunami could be significantly reduced by the proposed reinforced reinforcing technique.

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