Journal
CONTINENTAL SHELF RESEARCH
Volume 37, Issue -, Pages 66-78Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.csr.2012.02.010
Keywords
South China Sea; Mekong River delta; Coupled sediment transport modeling; Sediment budget
Categories
Funding
- U.S. Geological Survey
- International Office of the National Science Foundation
- Office of Naval Research
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A Coupled Wave-Ocean-Sediment Transport Model was used to hindcast coastal circulation and fine sediment transport on the Mekong shelf in southeastern Asian in 2005. Comparisons with limited observations showed that the model simulation captured the regional patterns and temporal variability of surface wave, sea level, and suspended sediment concentration reasonably well. Significant seasonality in sediment transport was revealed. In summer, a large amount of fluvial sediments was delivered and deposited near the Mekong River mouth. In the following winter, strong ocean mixing, and coastal current lead to resuspension and southwestward dispersal of a small fraction of previously deposited sediments. Model sensitivity experiments (with reduced physics) were performed to investigate the impact of tides, waves, and remotely forced ambient currents on the transport and dispersal of the fluvial sediment. Strong wave mixing and downwelling-favorable coastal current associated with the more energetic northeast monsoon in the winter season are the main factors controlling the southwestward along-shelf transport. (C) 2012 Elsevier Ltd. All rights reserved.
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