A Flare Shaped Seawall (FSS), the shape of which is an overhanging circular arc, can drastically reduce the crest elevation and wave overtopping amount in comparison with a conventional vertical one. However, it is thought that impulsive wave pressures are more likely to act on the surface of the FSS in rough seas. In this paper, a wave dissipating structure which reduces wave pressures and maintains the ability to prevent wave overtopping is investigated experimentally using a water channel. It is found that a combination of slit type columns in the FSS and wave dissipating blocks, located a little away from the FSS and the height of which coincides with the water surface, is suitable.
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