Abstract
Wave transformation by an array of offshore breakwaters is examined in multi-directional irregular waves. Especially, concerning the ratio of an array pitch length to a representative wave length, plane wave interactions with the arrayed breakwaters are examined extensively. It is pointed out that the wave height variation behind the breakwater array changes from a long-crested pattern to a shortcrested one with increasing a pitch length of periodically arrayed breakwaters as compared to a wave length.
