Abstract
Installing porous wave barriers at the top of a composite breakwater can be expected as an economical and effective method to realize a resilient breakwater against tsunami by reducing scour due to tsunami overflow. This study clarified the reduction effect of scour and the characteristics of tsunami force acting on a caisson by installing porous barriers by a series of hydraulic model experiments. The test results show that the stability of the armor blocks against tsunami overflow improve according to the height and the porosity of the barriers. From the viewpoint of the scour reduction effect, the barriers should be installed avoiding the vicinity of the rear face of the caisson. On the other hand, from the viewpoint of the tsunami forces acting on the caisson, it is better to place the barriers avoiding the vicinity of the front face of the caisson.
