scholarly journals Paleo-hydrogeological reconstruction of the fresh-saline groundwater distribution in the Vietnamese Mekong Delta since the late Pleistocene

2019 ◽  
Vol 23 ◽  
pp. 100594 ◽  
Author(s):  
Hung Van Pham ◽  
Frans C. Van Geer ◽  
Vuong Bui Tran ◽  
Wim Dubelaar ◽  
Gualbert H.P. Oude Essink
Keyword(s):  
Late Pleistocene ◽  
Mekong Delta ◽  
Saline Groundwater ◽  
Groundwater Distribution

scholarly journals Late Pleistocene - Holocene Sedimentary Evolution of Nam Bo Plain and Correlation from the Ca Mau Peninsula to the Mekong River Delta in Midle-Late Holocene

2019 ◽  
Vol 35 (4) ◽  
Author(s):  
Nguyen Thi Huyen Trang ◽  
Tran Nghi ◽  
Dinh Xuan Thanh ◽  
Nguyen Dinh Thai ◽  
Tran Thi Thanh Nhan
Keyword(s):  
Sea Level ◽  
Late Pleistocene ◽  
Late Holocene ◽  
Mekong Delta ◽  
Delta Plain ◽  
Sedimentary Evolution ◽  
Marine Lagoon ◽  
Absolute Age ◽  
Seismic Sections ◽  
Southern Plain

Located in southern Vietnam, the Southern plain is one of the largest in Asia. Within the coastal area, this study has indicated that there are two plains forming by different hydrodynamic mechanisms: the river dominated Mekong Delta plain and the tidal dominated plain of the Ca Mau peninsula. Studying lithofacies based on: (i) sedimentary parameters indicating environment of 29 boreholes in tidal flat and coastal plains, hundreds of surveyed surface sediment stations; (ii) stratigraphy seismic characteristics of the 21 seismic sections; and (iii) absolute age data, evolutionary history of late Pleistocene - Holocene sediments in the Southern plain and the relationship between the Mekong Delta and the tidal plain of the Ca Mau peninsula in the middle Holocene - late be clarified. Both plains are characterized by 3 lithofacies complexes corresponding to 3 phases of sea-level change: (i) lowstand alluvial facies complex (arLST Q13b); (ii) coastal facies complex (amtTST Q21-2) and shallow marine-lagoon greenish-gray clay facies (mtTST Q21-2); (iii) the phase of the middle-late Holocene (Q22-3 HST) has a differentiation between the two plains. The Me Kong delta is characterized by three deltaic facies complexes: (1) the late middle-late Holocene buried submarine deltaic facies complex (amh1Q22-3); (2) late Holocene deltaic plain facies complex (amh2Q23) and modern submarine deltaic facies complex (amh3Q23). The tidal plain of Ca Mau peninsula is characterized by a complex of sandy bars, tidal plains and tidal channels. In the regressive process, four periods of relative sea-level stopped, creating three ancient shoreline (5ka BP, 2.5ka BP; and 1 ka BP). The delta plain is marked by deltaic lobes turning to the southeast sea, while the Ca Mau plain characterized by the sand bars that tend to change direction from the east (2.5 ka BP) to the southeast (0.5ka BP and 0.2ka BP).    

scholarly journals Characteristics of consolidation settlements and sedimentary environments of the late Pleistocene–Holocene deposits in the Mekong Delta and Ho Chi Minh City, Vietnam

2020 ◽  
Vol 382 ◽  
pp. 367-374
Author(s):  
Minh Hoang Truong ◽  
Dinh Thanh Nguyen
Keyword(s):  
Land Use ◽  
Sea Level ◽  
Late Pleistocene ◽  
Land Subsidence ◽  
Mekong Delta ◽  
Ho Chi Minh City ◽  
Management Planning ◽  
Sedimentary Environments ◽  
Planning And Construction ◽  
Standard Strategy

Abstract. The report displays the characteristics of sedimentary environments, consolidation and consolidation settlements of the late Pleistocene–Holocene deposits in the Mekong Delta (MD) and Ho Chi Minh City (HCMC), Vietnam. The report furthermore discusses the influences of sedimentary environments on the consolidation properties and the resulting complex and large consolidation settlements. They cause land subsidence and uneven settlements of foundations in HCMC and the MD. They have especially combined with the unsuitable plans, land use like land fill in the lower land, rivers and ponds in the delta and increase in sea level by the global climatic change. As a result, it is very difficult to improve waterlogged areas in HCMC and the MD by the rain and tide waters. It is also not easy to propose a standard strategy for the management, planning and construction of these areas.

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