SEEPAGE FLOW IN A BREAKER ZONE

Proceedings of the International Conference on Coastal Engineering

Shizuka Ohishi¹  Taro Kakinuma²  Kazuo Nakamura² 

[1] Heisei Construction Co., Ltd.;Kagoshima University

关键词: seepage flow;    pore water pressure;    bar;    permeable beach;    breaker zone;   

DOI  :  10.9753/icce.v32.currents.54

学科分类：建筑学

来源: Coastal Engineering Research Council

【 摘 要 】

Seepage velocities in several breaker zones were measured with dye for visualization. Pressure gauges were also installed to obtain pore water pressure. Three cases of different incident-wave periods were treated in laboratory experiments. The time-averaged pore water pressure was higher near the shoreline, resulting in the seepage flow, the maximum velocity of which was larger as the incident-wave period was longer, generally moving from onshore to offshore. The penetrated water flowed out from the permeable seabed at a bar top or on the rather offshore side of the bar top if a bar was developed remarkably. The pore water pressure in the breaker zone showed time variation depending on the wave phases including wave breaking and bore propagation. There was a phase when the pore water pressure was locally low below the bar.

【 授权许可】

Unknown