In this study, about the characteristics scour of the pile-supported wave absorbing breakwater with a low crown height with different pile spacing and effects of the countermeasure against local scour, we intended to grasp by moving bed tests with plane water tank. As a result, we found that the scour depth is reduced by widening the spacing pile. Also we confirmed the effect of the countermeasure against local scour by model tests and field observation. In addition, by organizing the pile diameter including the countermeasure against local scour, there is a possibility that can be evaluated as a single pile. In addition, detailed studies are needed in the future as the effects of pile group.
