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Effect of Clay Content on the Sediment Suspension Over Liquefied Sand-Clay Mixed Bed Under Waves
1 , * 1 , 1 , 2
1  Hohai University
2  Nanjing Normal University
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In this study, a series of laboratory experiments on the response of sand-clay seabed under progressive waves were carried out to investigate the process of sediment suspension over a liquefied seabed. The sand-clay beds with various clay content (CC) ranging from 0 to 15% were tested for a specific wave condition. The excess pore water pressure (EPP), suspended sediment concentration (SSC) and elevation of mixed beds were recorded for each test. The experimental results indicated that seabed with a certain amount CC was easier to liquefy compared with pure sandy bed. The SSC of liquefied sand-clay bed is bigger than that of non-liquefied mixed bed. The SSC above sand-clay bed is smaller than that of sandy bed, but the erosion depth of mixed bed is bigger than that of sandy bed.

Keywords: sediment suspension; clay content; erosion; pore water pressure; cohesion; waves