Abstract
In recent years, when constructing structures in harbor, various measures are demanded with consideration for the surrounding ecosystem. We expect a shell substrate is an improvement material since this is good base as habitats for a variety of invertebrate and seaweed. In this report, we tried to visualize the currents around the substrate and measure velocity profiles by the hydraulic model experiment to prove the mechanism. As a result, particles in the drift were taken into aperture of the substrate with the current broken. It is presumed that those processes get boost a variety of invertebrate and seaweed settling down to the shell passing through complicated interior space more efficiently.
