Sedimentary process and strength of cohesive sediment in an estuarine channel

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The river bathymetry and distribution of the riverbed material were frequently analyzed during 2002-2009 in the estuarine channel of the Chikugogawa River. The bed material was mainly composed of silt and clay during low flow periods; however, it was eroded and flushed away, and after the storm runoff, it changed to sand. Furthermore, over a period of several months, the sand bed was gradually covered with fine sediment, and the thickness of the muddy layer became 1-2 m after half a year. The acquired cohesiveness could be observed within a few days after the particles were deposited on the bed, and it increased linearly with time. It accounted for approximately 67% of the natural sediment cohesiveness.