Accuracy of wave overtopping rate under irregular wave conditions computed with a two-dimensional numerical wave flume 'CADMAS-SURF' was verified by comparing with hydraulic model experimental results. Furthermore, numerical examinations to determine the most efficient countermeasure against wave overtopping around road revetment were carried out using the CADMAS-SURF changing the shape and crest height of revetments under irregular waves. As a result, it was revealed that the CADMAS-SURF can reproduce not only wave deformation but also wave overtopping rate around revetments with complicated configurations. A numerical wave flume such as the CADMAS-SURF was, moreover, found to be useful in comprehensively discussing the prevention of wave overtopping disaster.

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 A sediment transport model considering unresolved scales of turbulence in large-eddy simulation(LES) and resistance force due to infiltration/exfiltration across the surface of the sediment substrate is proposed and incorporated into a three-dimensional coupled fluid-structure-sediment interaction model (FSSM). For validation, the FSSM combined with the proposed sediment transport model is applied to local scouring around an inland structure due to a run-up tsunami. Numerical results show that the evolution of a scour hole around the seaward corner of the structure is affected by the turbulence and the infiltration/exfiltration, and demonstrate that it is essential to take into account both of them in dealing with tsunami-induced sediment transport. As a result, the FSSM combined with the proposed sediment transport model is found to be useful to accurately predict and assess local scouring due to run-up tsunamis.

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