Expected Total Repair Cost of Detached Breakwaters Including Influences of Wave Group Characteristics of Incident Waves

Susumu ARAKI, Gou URAI, Hirotoshi MAKINO, Mamoru ARITA and Ichiro DEGUCHI Expected total repair cost of detached breakwaters is estimated in this study. The criterion for repair is based on the reduction of hydraulic performance of the detached breakwaters. The relationship between incident wave height, deformation of the detached breakwater body and transmitted wave height is measured in experiments. The influences of wave group characteristic of incident waves on the transmitted wave height behind the detached breakwater are taken into account. Wave group characteristics have a great influence on the expected total repair cost because the deformation of the detached breakwater and the transmitted wave height are dependent on the wave group characteristics in a certain range of incident wave height.