tailieunhanh - Surface sediment grain-size distribution and sediment transport in the subaqueous Mekong Delta, Vietnam

This paper presents characteristics of grain-size parameters of the surface sediments in order to interpret the sediment-transport pattern and the linkage to coastal erosion and deposition off the Mekong River delta. Surface sediments collected in the coastal water of Mekong River delta (as far south as Ca Mau Peninsula) were analyzed to determine the grain-size distribution and sediment transports in subaqueous Mekong delta. | Vietnam Journal of Earth Sciences, 39(3), 193-209, DOI: Vietnam Academy of Science and Technology (VAST) Vietnam Journal of Earth Sciences Surface sediment grain-size distribution and sediment transport in the subaqueous Mekong Delta, Vietnam Nguyen Trung Thanh*1, Karl Stattegger2, Daniel Unverricht2, Charles Nittrouer3, Phung Van Phach1, Paul Liu4, David DeMaster4, Bui Viet Dung5, Le Duc Anh1, Mai Duc Dong1 1 Institute of Marine Geology and Geophysics, VAST, Vietnam 2 University of Kiel, Germany 3 School of Oceanography, University of Washington, Seattle, WA, USA 4 North Carolina State University, USA 5 Institute of Petroleum, Vietnam Received 14 February 2017. Accepted 25 May 2017 ABSTRACT The sediment transport around the Mekong delta was clarified by using geochemical data and modeling indicating the southwestward transport of re-suspended sediments under the influence of NE monsoon. However, the detail pattern of grain-size distribution of the surface sediments in the subaqueous Mekong River delta has not been well understood. This paper presents characteristics of grain-size parameters of the surface sediments in order to interpret the sediment-transport pattern and the linkage to coastal erosion and deposition off the Mekong River delta. Surface sediments collected in the coastal water of Mekong River delta (as far south as Ca Mau Peninsula) were analyzed to determine the grain-size distribution and sediment transports in subaqueous Mekong delta. Results indicated that the net sediment transport was southwestward to the Ca Mau peninsula and the sediments were finer from the delta topset downward the delta foreset. In contrast, the sediment particles on the adjacent inner shelf were coarser and are more poorly sorted due to the increase in carbonate shell fragments and the Early Holocene sediments. The sediment grainsize parameters were variable in different sedimentary .

• Địa Lý
• Vietnam Journal of Earth Sciences
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