TY - JOUR
T1 - The controlling of paleo-riverbed migration on Arsenic mobilization in groundwater in the Red River Delta, Vietnam
AU - Trung, Dang Tran
AU - Nhan, Nguyen Thi
AU - Van Don, Than
AU - Hung, Nguyen Kim
AU - Kazmierczak, Jolanta
AU - Nhan, Pham Quy
N1 - Funding Information:
The database in this paper is collected and conducted with the support of the project PREAS: "Predicting the content of groundwater of the floodplains in SE Asian", signed among Geological Survey of Denmark and Greenland (GEUS), Hanoi University of Sciences, Vietnam (HUS) and Hanoi University of Mining and Geology, Vietnam (HUMG), the project was implemented from January 1, 2014, to December 31,2017.
Publisher Copyright:
© 2020 Vietnam Academy of Science and Technology.
PY - 2020
Y1 - 2020
N2 - 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-KJ.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.
AB - 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-KJ.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.
KW - Dan Phuong - Thach That area
KW - Groundwater arsenic pollution
KW - MODFLOW
KW - Paleo-riverbeds
KW - Red River Delta
KW - Solute transport model
UR - http://www.scopus.com/inward/record.url?scp=85101971484&partnerID=8YFLogxK
U2 - 10.15625/0866-7187/42/2/14998
DO - 10.15625/0866-7187/42/2/14998
M3 - Article
AN - SCOPUS:85101971484
SN - 2615-9783
VL - 42
SP - 161
EP - 175
JO - Vietnam Journal of Earth Sciences
JF - Vietnam Journal of Earth Sciences
IS - 2
ER -