EFFECT OF BARRIER HEIGT ON WAVE OVERTOPPING AND WAVE FORCE AT THE PERFORATED WAVE BARRIER MOUNTED ON A VERTICAL SEAWALL COVERED WITH WAVE-DISSIPATING BLOCKS

The present study examined the effect of barrier height on the mitigation effect of perforated barriers on wave overtopping and wave forces. Hydraulic model experiment was carried out for the extremely high wave condition where the wave overpass the top of the wave barrier mounted on a vertical seawall covered with wave-dissipating blocks. The experimental results showed that the wave force acting on the perforated barrier was reduced to about the shield rate compared to the force on the unperforated wall. However, if waves frequently overpass the top of the barrier, the rate of reduction in wave force on the perforated barrier has increased by up to 20% from the shield rate. The ratio of the wave overtopping discharge of the perforated barrier to the discharge of the unperforated wall depended on the relative wave height or the relative runup height and the shield ratio.