Experimental Study on Critical Stress for Sediment Incipient Motionin Deep Channel of North Passage of Yangtze River Estuary

Abstract:

The average particle sizes of the sediment deposited in deep channel of North Passage of Yangtze River estuary are different at different channel segments in the flooding and dry seasons. As a response, the critical stress for sediment incipient motion might be different, which needs to be studied systematically especially after the channel reaches a new grade with depth of 12.5m. Therefore, a series of tests on the sediment were conducted to determine the critical parameters for the sediment incipient motion with different particle sizes between 0.01mm and 0.04mmcollected from deep channel of Yangtze River. The experimental data indicate that the critical shear stresses increase exponentially with density, and the stresses are 0.2-0.7Pa for the mud with density of 1200-1600kg/m³.And the relational expression between the critical shear stress and the depth was built, which might be applied in the mathematical model to simulate the process of incipient motion for sediment in deep channel of Yangtze River and others.

• Periodical: Applied Mechanics and Materials (Volume 751)
• Pages: 170-175
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.751.170
• Online since: April 2015
• Authors: Qi Xiu Pang*, Chun Peng Wen, Rui Bo Zhang
• Keywords: Critical Stress, Deep Channel, Flume Experiments, Incipient Motion, Sediment, Yangtze River Estuary

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