Forces exerted on seaside perforated semicircular breakwaters due to regular and random waves

The concept of semicircular breakwater (SBW) is one of the recently emerging special types of composite breakwater. The SBW function as a barrier dissipating the incident wave energy and to create tranquility condition on its leeside. The horizontal and vertical forces due to regular and random waves exerted on seaside of SBW with 7 and 11% of its exposed area with perforations were measured. The effect of perforations, water depth and rubble mound height on variation of dimensionless forces were studied. In addition, the reflection characteristics of the perforated SBWs as a function of relative water depth, h(w)/L is reported and discussed in this paper.