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Wave transformation in shallow water can be underestimated in generation for a representative incident wave spectrum (Hirayama et.al, 2010). The damage wave called Yorimawari-nami which causes many caissons of the offshore breakwater slide widely in Fushiki-Toyama port in 2008, however, are usually estimated with the representative single wave spectrum in shallow water. In this paper, the characteristics of wave height distribution in front of the damaged breakwater are investigated by reproducing wave transformation on complex bathymetry in generation for several incident wave spectra in Boussinesq model. In addition, the same numerical simulation is carried out for the shorter period wave appeared in the storm due to 23th typhoon in 2004, in order to make comparison with them. The wave height distributions at the wave observation station and along the damaged breakwater become gentle around the peak for Yorimawari-nami in generation for several wave spectra at incident boundary, though they still correspond to the Rayleigh distribution at the foot.

CHARACTERISTICS OF WAVE HEIGHT DISTRIBUTION IN RANDOM WAVE GENERATED BY SEVERAL WAVE SPECTRA IN SHALLOW WATER