Mamoru Ishigaki

THE POWER GENERATION FROM TIDAL CURRENTS USING PIER AT SETO INLAND SEA

Japan is the maritime state surrounded by the sea, effective use of the ocean energy which exists abundantly is an important issue, and the realization is desired. Tidal current is the periodic energy which can be predicted, therefore it can expect to supply energy stably. In Seto Inland Sea, many straits and Seto regions exist, and it is known that tidal current energy will be amplified because a tidal current becomes quick. Therefore, the power generation technology which utilized current energy attracts attention. This study estimated the possibility of the tidal current power generation in Seto Inland Sea by performing local observation. At first time, the amount of maximum energies was calculated by observing the tidal current of Seto Inland Sea. Next, the amount of maximum energies obtained when a dynamo is built was calculated.

The Possibility of Tidal Current Control as Water Quality Remediation in Semi-Enclosed Area Osaka Bay

The objective of this study is to verify the possibility of restraining the formation of low dissolved oxygen water condition in the bottom layer of semi-enclosed bay by tidal current control. Firstly, Omaehama area in Osaka Bay was selected for case study area and detailed environmental investigation was conducted in order to clarify how limited tidal current affected the water quality in the region. Secondly, the feasibility of tidal current control as water quality remediation measures was studied by hydraulic simulation. As a result of this study, it was confirmed that anoxic water condition in semi-enclosed bay could be reduced by tidal current control by enhancing water exchange between the semi-closed area and outer sea and reducing the amount of organic suspended solids.