Review on the Specific Characteristics of the Sediment Movement in Estuary Sandbar Area: With the Yangtze Estuary as an Example

Abstract:

Sandbar is the main geomorphic unit in estuary, and due to the effects of runoff, tide and fresh-salt water mixing, the sediment movement there differs from others. Taking the Yangtze Estuary as an example, firstly, its sediment transport forms many circles both in longitudinal sections and transverse sections. Secondly, its sediment trapping is controlled by two different mechanisms, tidal current and salt water. The former contains the delay effect of sediment deposition and incipient motion, the asymmetry of flood and ebb, and the separation of flood and ebb, whereas the latter includes the influence of the saltwater wedge density current, the aggregation of the saltwater intrusion fronts, and the trapping of flocculation. Finally, its sediment re-suspension occurs three or four times ,not noly at the moment of flood or ebb maximumbut also at the transferring period from flood to ebb or from ebb to flood.

• Periodical: Applied Mechanics and Materials (Volumes 405-408)
• Pages: 1476-1480
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.405-408.1476
• Online since: September 2013
• Authors: Jie Gu*, Xiao Li Wang, Xin Qin, Dan Qing Ma, Ji Zhong Yang, Tian Hu, Yuan Wang
• Keywords: Sandbar, Sediment Movement, Specific Characteristics

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