Abstract
This study, which uses examples from inner Osaka Bay, will show the improvements in flow environment promoted by installation of a permeable breakwater. In addition, it demonstrates, improvements in the coastal environment as shown by an index of growth of the biotic community adhering to gentle slope-type seawall, which enable the evaluation of the technology considered in this report. Hydraulic model testing shows that improvements in flow environment can be realized, and laboratory experiments and onsite field research that changes in the flow environment should result in a diversification of the bioecology.