Abstract
The breakwater and revetment constructed in the wave breaking zone are normally covered with wave-dissipating concrete blocks in front of the upright structure to decrease wave overtopping, transmitted wave and to reduce wave pressure acting on the wall. There is the upright structure with detached wave-dissipating concrete blocks, which is a kind of structure described above. In general, the detached type may be more effective measures to decrease overtopping and/or transmitted wave than the covered type. The problem is that the both of overtopping rate and transmission coefficient of the detached type cannot be estimated quantitatively. Moreover the wave pressure acting on the wall is unknown for steep bottom slope. In this study, we examine the performance of the two detached type models for bottom slope of 1/10 by physical model test and numerical simulation. The volume of fluid method is employed in numerical simulation. As a result, we can obtain the rate of overtopping, transmission coefficient and water elevation in wave chamber. It is also found out that the wave pressure acting on the wall is impulsive.
