DOI: 10.1016/j.gloplacha.2012.12.009
论文题名: Modern sedimentation and morphology of the subaqueous Mekong Delta, Southern Vietnam
作者: Unverricht D. ; Szczuciński W. ; Stattegger K. ; Jagodziński R. ; Le X.T. ; Kwong L.L.W.
刊名: Global and Planetary Change
ISSN: 0921-8223
出版年: 2013
卷: 110 起始页码: 223
结束页码: 235
语种: 英语
英文关键词: Grain size distribution
; Mekong Delta
; Sediment accumulation rate
; Sedimentation
; Subaqueous delta morphology
Scopus关键词: Grain size distribution
; Mekong Delta
; Sediment accumulation
; Sediment distribution
; Sedimentary response
; Sedimentation process
; Subaqueous delta
; Transport direction
; Atmospheric thermodynamics
; Calcium
; Cluster analysis
; Grain size and shape
; Morphology
; Rivers
; Sediment transport
; Sedimentology
; Sedimentation
; delta
; foraminifera
; geoaccumulation
; geomorphology
; grain size
; river discharge
; seafloor
; sediment transport
; sedimentation
; surficial sediment
; tidal cycle
; Bassac River
; Mekong Delta
; Viet Nam
英文摘要: The Mekong River Delta is among the Asian mega-deltas and is influenced by various factors including tides (meso-tidal system), waves, coastal currents, monsoon-driven river discharge and human impact (agriculture, fishing, sand dredging, tourism). The present study aims to document the seafloor relief, sediment distribution and sediment accumulation rates to interpret modern sediment transport directions and main sedimentation processes in the subaqueous Mekong Delta. The major results of this investigation include the detection of two delta fronts 200. km apart, one at the mouth of the Bassac River (the biggest branch of the Mekong Delta) and the other around Cape Ca Mau (most south-western end of the Mekong Delta). Additionally, a large channel system runs in the subaqueous delta platform parallel to the shore and between the two fronts. The sediment accumulation rates vary greatly according to the location in the subaqueous delta and have reached up to 10. cm/yr for the last century. A cluster analysis of surface sediment samples revealed two different sediment types within the delta including a well-sorted sandy sediment and a poorly sorted, silty sediment. In addition, a third end member with medium to coarse sand characterised the distant parts of the delta at the transition to the open shelf. The increase of organic matter and carbonate content to the bottom set area and other sedimentary features such as shell fragments, foraminiferas and concretions of palaeo-soils that do not occur in delta sediments, supported grain size-based classification. Beginning in front of the Bassac River mouth, sedimentary pattern indicates clockwise sediment transport alongshore in the western direction to a broad topset area and the delta front around Cape Ca Mau. Our results clearly show the large lateral variability of the subaqueous Mekong Delta that is further complicated by strong monsoon-driven seasonality. River, tidal and wave forcing vary at local and seasonal scales with sedimentary response to localised short-term depositional patterns that are often not preserved in long-term geological records. © 2012 Elsevier B.V. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84888294509&doi=10.1016%2fj.gloplacha.2012.12.009&partnerID=40&md5=585168cc797f6c8fc657d500a4cfd160
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/11129
Appears in Collections: 全球变化的国际研究计划
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作者单位: Institute of Geosciences - Department of Sedimentology, Christian-Albrechts-University of Kiel, Germany
Recommended Citation:
Unverricht D.,Szczuciński W.,Stattegger K.,et al. Modern sedimentation and morphology of the subaqueous Mekong Delta, Southern Vietnam[J]. Global and Planetary Change,2013-01-01,110.