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As the length of a caisson becomes long, the wave force per unit length becomes smaller because of the wave phase difference. In this study, we performed hydraulic model test on a long caisson placed on the complicated submarine topography model under various wave conditions in order to investigate the characteristics of wave reduction.It is found that the wave force on a long caisson placed on the complicated submarine topography is reduced significantly in the case of oblique waves. The reduction ratio for multi-directional random waves is smaller than that for uni-directional random waves due to directional spreading. In the case of head-on waves, wave force per unit length on the long caisson becomes smaller because of the dispersion of the wave height and the phase due to wave refraction.

REDUCUTION OF WAVE FORCE ON A LONG CAISSON OF VERTICAL PLACED ON THE COMPLICATED SUBMARINE TOPOGRAPHY