IAHR, founded in 1935, is a worldwide independent member-based organisation of engineers and water specialists working in fields related to the hydro-environmental sciences and their practical application. Activities range from river and maritime hydraulics to water resources development and eco-hydraulics, through to ice engineering, hydroinformatics, and hydraulic machinery.
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You are here : eLibrary : IAHR World Congress Proceedings : 35th IAHR Congress - Chengdu (2013) : THEME 6 - MARITIME HYDRAULICS AND COASTAL ENGINEERING : Modeling Processes Controlling Sediment Transport at the Mouth Bar of the Yangtze Estuary
Modeling Processes Controlling Sediment Transport at the Mouth Bar of the Yangtze Estuary
Author : Ao Chu, Z. B. Wang, H.J. de Vriend and Jiaai Tai
A hydrodynamic and sediment transport model for the Yangtze Estuary was set up by using the Delft3D modeling system in order to examine and isolate the physical processes responsible for sediment transport and morphological changes around the mouth bar of the estuary. Various combinations of physical processes\mechanisms are turned on in simulations for the sediment transport around the mouth bar area. The influences of river discharge, tidal asymmetry, gravitational circulation and flocculation of fine cohesive sediment on sediment transport are studied. Results show that the spatially and temporally varying balance of physical processes governs the sediment transport at the mouth bar area. In the absence of salinity gradients, runoff induces a large sediment export from the river to the sea. Including gravitational circulation, 3D salinity structure, reduces the net sediment export and results in sediment trapped around the mouth bar. If the flocculation mechanism is included, the deposition of sediment in the mouth bar area will be enhanced. The conclusion is that the gravitational circulation is the prerequisite for mouth bar formation in the Yangtze Estuary.
File Size : 482,139 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 35th IAHR Congress - Chengdu (2013)
Date Published : 18/07/2016
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