Abstract
Wave pressures acting on a caisson covered with armor units are investigated under wave attacks of which wave heights are greater than a design wave height for the armor units. Damage levels of the armor layer were measured to discuss change of the wave pressure profile due to the development of the armor layer. No significant increase of the wave pressure is found when the damage level is less than 10 (damage rate based on Hudson formula is less than 34%). When the damage level is greater than 10, the wave pressure over the still water level acting on the. caisson drastically increases.
