The controlling of paleo-riverbed migration on Arsenic mobilization in groundwater in the Red River Delta, Vietnam

In the Red River Delta, the concentrations of Arsenic in groundwater of alluvial dominated systems are very high, exceeding the WHO’s permissible. The correlation between the Arsenic concentrations in groundwater and the age of Holocene sediment as a key controlling groundwater Arsenic concentration in the Red River delta has been investigated. The evolution of sediments in the Holocene is closely related to paleo-riverbed migration in the past. A combination of methods is implemented including remote sensing, multi-electrode profiling (MEP), gamma-logging, drilling, soil sample and groundwater modeling. The resul has identified the shape, sediment compositions and location of the six paleo-riverbed periods. The age of the paleo-riverbed is determined by drilling, soil sampling and optically stimulated luminescence (OSL) in the laboratory. The oldest sediments is 5.9±0.4 ka BP in Phung Thuong near the mountain, the youngest one is from 0.4÷0.6 ka BP in H-transect near the Red River and the rest of the other is around 3.5 ka BP. The modeling results by using MODFLOW and MT3D show that the dynamics of paleo-riverbeds controlling Arsenic mobilization in groundwater in the Red River Delta. When the river moved to another position, the current river position at that time was filled with younger sediments and became paleo-riverbed formation with reducing conditions, Arsenic content which was adsorbed in the previous stage then released into groundwater. Therefore, Arsenic concentration in groundwater of young Holocene sediments is higher than in older ones which elucidates that paleo-riverbed migration controls on Arsenic mobilization in groundwater in the study area.

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The controlling of paleo-riverbed migration on Arsenic mobilization in groundwater in the Red River Delta, Vietnam

Vietnam Journal of Earth Sciences ◽

10.15625/0866-7187/42/2/14998 ◽

2020 ◽

Vol 42 (2) ◽

pp. 161-175

Author(s):

Dang Tran Trung ◽

Nguyen Thi Nhan ◽

Than Van Don ◽

Nguyen Kim Hung ◽

Jolanta Kazmierczak ◽

...

Keyword(s):

Groundwater Modeling ◽

Arsenic Concentration ◽

River Delta ◽

Red River ◽

Arsenic Content ◽

Red River Delta ◽

Arsenic Mobilization ◽

Reducing Conditions ◽

Arsenic In Groundwater ◽

Combination Of Methods

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Spatial distribution of arsenic in groundwater in the northwestern Hanoi

Ministry of Science and Technology, Vietnam ◽

10.31276/vjst.63(11db).19-23 ◽

2021 ◽

Vol 63 (11) ◽

pp. 19-23

Author(s):

Thi Duyen Vu ◽

◽

Thi Mai Tran ◽

Thi Kim Trang Pham ◽

Mai Lan Vi ◽

...

Keyword(s):

Spatial Distribution ◽

Arsenic Concentration ◽

Red River ◽

Arsenic Content ◽

Red River Delta ◽

Arsenic Distribution ◽

Arsenic In Groundwater ◽

Guideline Value ◽

Wide Range ◽

Major River

Arsenic contamination in groundwater is commonly found in alluvial plains of major river basins, in which the Red river delta has also been reported to be contaminated with high levels of arsenic. In this study, groundwater from 50 household wells was collected to study the spatial distribution of arsenic in northwestern Hanoi. The results showed that arsenic concentration in groundwater varied in a wide range of less than 5 to 334 μg/l, of which up 62% of the wells exceeded the WHO guideline value of 10 μg/l for arsenic content in drinking water. Arsenic groundwater in this area is unevenly distributed throughout the area, high arsenic concentrations are found in a narrow band between Red river and Day river. This pattern of arsenic distribution is strongly related to the sediment age, sedimentary processes, and it is also modified by local groundwater flow parts and the occurrence of hydraulic connection between aquifers, which are observed in the study area. Arsenic is released into the groundwater during the reductive dissolution of arsenic-bearing minerals under the presence of organic matter.

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Groundwater arsenic content related to the sedimentology and stratigraphy of the Red River delta, Vietnam

The Science of The Total Environment ◽

10.1016/j.scitotenv.2021.152641 ◽

2021 ◽

pp. 152641

Author(s):

Jolanta Kazmierczak ◽

Dieke Postma ◽

Trung Dang ◽

Hoan Van Hoang ◽

Flemming Larsen ◽

...

Keyword(s):

River Delta ◽

Red River ◽

Arsenic Content ◽

Red River Delta ◽

Groundwater Arsenic

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Climate Change and Land Use Change of Rural Households in The Red River Delta, Vietnam

Journal of Economics and Development ◽

10.33301/2013.15.02.05 ◽

2013 ◽

pp. 79-94

Author(s):

Ngoc Luu Bich

Keyword(s):

Climate Change ◽

Land Use ◽

Agricultural Land ◽

Rural Households ◽

River Delta ◽

Red River ◽

Red River Delta ◽

Sea Levels ◽

Main Production ◽

Farming Households

Climate change (CC) and its impacts on the socio-economy and the development of communities has become an issue causing very special concern. The rise in global temperatures, in sea levels, extreme weather phenomena, and salinization have occurred more and more and have directly influenced the livelihoods of rural households in the Red River Delta – one of the two regions projected to suffer strongly from climate change in Vietnam. For farming households in this region, the major and traditional livelihoods are based on main production materials as agricultural land, or aquacultural water surface Changes in the land use of rural households in the Red River Delta during recent times was influenced strongly by the Renovation policy in agriculture as well as the process of industrialization and modernization in the country. Climate change over the past 5 years (2005-2011) has started influencing household land use with the concrete manifestations being the reduction of the area cultivated and the changing of the purpose of land use.

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