Recent flow regime and sedimentological evolution of a fluvial system as the main factors controlling spatial distribution of arsenic in groundwater (Red River, Vietnam)

TY - GEN

T1 - Recent flow regime and sedimentological evolution of a fluvial system as the main factors controlling spatial distribution of arsenic in groundwater (Red River, Vietnam)

AU - Kazmierczak, J.

AU - Larsen, F.

AU - Jakobsen, R.

AU - Postma, D.

AU - Sø, H. U.

AU - Hoan, H. V.

AU - Trung, D. T.

AU - Nhan, P. Q.

AU - Hass, Andreas Elmelund

AU - Hoffmann, Andreas Hvam

AU - Trang, P. T. K.

AU - Lan, V. M.

AU - Viet, P. H.

PY - 2016

Y1 - 2016

N2 - We investigate a relationship between geological history, groundwater flow paths and the spatial distribution of arsenic in aquifers of the upper part of the Red River delta in Vietnam. Hydrogeological conditions in the research area are complex. The fining upward sequence of Pleistocene alluvial sediments was partially eroded during the Holocene and covered by sand and clay deposited in fluvial environments. Sedimentary processes lead to the development of two flow systems. Shallow groundwater discharges either to the local surface water bodies or, in the areas where low permeable sediments isolating Pleistocene and Holocene aquifers were eroded, to the deep groundwater flow system discharging to Red River. Previously reported pattern of arsenic groundwater concentrations decreasing with an increasing sediment age is modified by the observed flow regime. Connection of the younger and older river channels resulted in a transport of high arsenic concentrations towards the Pleistocene aquifer, where low arsenic concentrations were expected.

AB - We investigate a relationship between geological history, groundwater flow paths and the spatial distribution of arsenic in aquifers of the upper part of the Red River delta in Vietnam. Hydrogeological conditions in the research area are complex. The fining upward sequence of Pleistocene alluvial sediments was partially eroded during the Holocene and covered by sand and clay deposited in fluvial environments. Sedimentary processes lead to the development of two flow systems. Shallow groundwater discharges either to the local surface water bodies or, in the areas where low permeable sediments isolating Pleistocene and Holocene aquifers were eroded, to the deep groundwater flow system discharging to Red River. Previously reported pattern of arsenic groundwater concentrations decreasing with an increasing sediment age is modified by the observed flow regime. Connection of the younger and older river channels resulted in a transport of high arsenic concentrations towards the Pleistocene aquifer, where low arsenic concentrations were expected.

UR - http://www.scopus.com/inward/record.url?scp=85017026799&partnerID=8YFLogxK

U2 - 10.1201/b20466-35

DO - 10.1201/b20466-35

M3 - Article in proceedings

AN - SCOPUS:85017026799

SN - 978-1-138-02941-5

SP - 72

EP - 73

BT - Arsenic Research and Global Sustainability - Proceedings of the 6th International Congress on Arsenic in the Environment, AS 2016

A2 - Bhattacharya, Prosun

A2 - Vahter, Marie

A2 - Jarsjö, Jerker

A2 - Kumpiene, Jurate

A2 - Ahmad, Asrlan

A2 - Sparrenbom, Charlotte

A2 - Jacks, Gunnar

A2 - Donselaar, Marinus Eric

A2 - Bundschuh, Jochen

A2 - Naidu, Ravi

PB - CRC Press

T2 - 6th International Congress on Arsenic in the Environment, AS 2016

Y2 - 19 June 2016 through 23 June 2016

ER -