Abstract
The author proposes a design method of a detached submerged breakwater system to improve the habitat environment of Spisula sachalinensis (Japanese surf clam), which is one of the most expensive bivalves in Japan. According to the recent investigations, a general description of the ecological condition of the bivalve is given, in which a hydrodynamic explanation on the phenomena of the winter casting-up of Spisula sachalinensis due to waves is also given. Then a general design method of a detached submerged breakwater system, which is suited to the propagation of thekind of bivalves, is shown. Wave force on cover stones through sea weeds, such as Eisenia bicyclis and Ecklonia cava, is made clear as well on the basis of wave flume experiments.
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