Wave Force Characteristics on a Barrier-Type Reflection Dissipater and Super-Structure Effect on Wave Reflections

Abstract

It has become known that a vertical-barrier-type reflection dissipater is more effective thanthe conventional perforated-wall-type dissipater to reduce reflected waves from the sea walls, especially forcomparatively long waves. The dissipation mechanism of reflected waves is to enhance vortex flows around a verticalbarrier excited by the piston-mode wave resonance in the water chamber. In this study, wave force characteristics onthe barrier-type dissipater were examined extensively. Based on both the physical model tests and thetheoretical computations by use of the damping wave theory, the estimation method of peak wave forces on each wall and totalresultant forces was precisely discussed. For the practical design, effect of the vertical position of cappingplates above the water chamber on the wave reflection and uplift force was also examined experimentally.