Abstract
Breakwater caissons with armor blocks are builted at so many places. It is very simple structure that it has armor blocks in front of caisson. It needs a lot of blocks where it built deep sea, because armor blocks setted by gentle slope.Then it needs high-cost.
Setback parapet breakwater caisson with cylindical piler is one of this type caisson, but top of armor block is lower and parapet was setted back from caisson face. The parapet is pressed by impuct breaking wave pressure becouse it is not covered by armor blocks. Then cylindical pilers gain wave force for parapet.
This paper reports typical wave pressure distribution of this type caisson in case of instability.
