New permeable type breakwater with low wave reflection performance is developed. This breakwater consists of a slit wall and reservoirs, in which L-type impermeable walls are set up, in front of a permeable vertical wall.
As the results of hydraulic model tests on the wave reflection, it is found that the breakwater has very low wave reflection performance for wide frequency range. Furthermore, the experiments on the water exchange performance are carried out, and it is found that the breakwater is effective in water quality improvement of an inner bay.
