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Utilization of the ocean energy to meet the electricity need is important to realization. The increasing need for electricity and environmental issues are the reasons. In last several decades a number of studies on wave energy device have been carried to find the effective one. In this paper, the double-water-chamber type seawall is basically adopted that has a similar structure to the OWC was examine to extract wave power. In the experiment various arrangement of wave power device inside the double water-chamber was tested to obtain optimum of wave extraction rate. Another function of the double water-chamber as wave dissipation is also clarified in the experiment. Based on experimental result the maximum wave energy conversion efficiency is about 30% and the reflection coefficient of the double-water-chamber seawall is about 0.3 on average.

Effect of Wave Power Device Arrangement in Double-Water-Chamber Type Seawall towards Wave Power Extraction Rate and Wave Dissipation