1 正会員 修(工) 東京大学大学院学生(前) 社会基盤学専攻(〒113-8656 文京区本郷7-3-1) 2 正会員 Ph.D. 東京大学大学院准教授 社会基盤学専攻(同上) フェロー会員 工博 東京大学大学院教授 社会基盤学専攻(同上) This paper aims to investigate the possible function of a new system which prevents the blockage of the river mouth and reduces the amount of trapped longshore sediment transport rate across the river mouth. Instead of using fossil energy, the proposing system utilizes natural waves to increase the flow rate at the river mouth by controlling the wave-induced circulation

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... ts. Laboratory experiment on the fixed bed was first carried out to capture the hydrodynamic characteristics on the proposing system and also extract the optimum conditions such as allocations and sizes of the structures. Numerical experiments then followed the laboratory experiment to investigate the quantitative budgets and effectiveness of the water intake and circulation currents. Finally, the movable bed experiments were performed to examine the expecting functions of the proposing system..