Abstract
The hydraulic characteristics of a block with perforations are studied experimentally and theoretically. The present paper is threefold: a field test to examinethe stability of block and the growth of seaweed; an experimental study to measure a reflection coefficient, a transmission coefficient and a rate of wave energy dissipation; and a numerical simulation to examine the flow field over the mound with blocks by employing the κ-ε turbulence model which has considered the perforations of blocks.
It was found through the field test that the stability of prototype models was extremely high and many kinds of seaweed have been adhering to blocks. The number of stability could be calculated with a ratioof submerged depth of crown and a wave height. Also wave energy dissipation could be promoted over blocks. The agreement between experimental data and the calculated values by the numerical simulation for the transmission coefficient and wave profiles over the blocks is found to be good.
