Author(s): Hideo Kondo; Isao Yamauchi; Senji Osanai
Linked Author(s):
Keywords: Beach erosion; Detached breakwater; Wave power utilization; Pendulor system; Cost effectiveness
Abstract: A system had been proposed by the senior author which has capability of wave power extraction and coastal protection at erosive coasts in 1997. It consists of a high efficiency power extractor of pendulum type named Pendulor installed in a pile supporting structure and a solid back wall which will act like a detached breakwater. The structural system is planned so as to distribute the incident wave power to the reflected, absorbed and transmitted powers, respectively, 20,40 and 10%. The back wall has low crest elevation to decrease wave force at storm waves, and a clearance between its bottom and the seabed to allow on-off shore movement of sediment. In order to verify the above requirements and to get the other related data, a series of two dimensional hydraulic experiments was performed for wave deformation, power absorbing efficiency, wave force and seabed scouring. The three dimensional basin experiment was carried out subsequently to investigate wave deformation and power absorption of the system in a detached breakwater group. A cost analyses has been performed to estimate the production cost of electricity together with the total cost which includes an environmental cost and a social cost. It is confirmed the present system has a high feasibility for erosive coasts.
Year: 2001