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

J. Kazmierczak, F. Larsen, R. Jakobsen, D. Postma, H.U. Sø, H.V. Hoan, D.T. Trung, P.Q. Nhan, A.E. Hass, A.H. Hoffmann, P.T.K. Trang, V.M. Lan, P.H. Viet

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingspeer-review

3 Citations (Scopus)

Abstract

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.

Original languageEnglish
Title of host publicationArsenic Research and Global Sustainability - Proceedings of the 6th International Congress on Arsenic in the Environment, AS 2016
EditorsProsun Bhattacharya, Marie Vahter, Jerker Jarsjö, Jurate Kumpiene, Arslan Ahmad, Charlotte Sparrenbom, Gunnar Jacks, Marinus Eric Donselaar, Jochen Bundschuh, Ravi Naidu
Place of PublicationLeiden
PublisherCRC Press/Balkema
Pages72-73
Number of pages2
ISBN (Print)978-1-13802941-5
Publication statusPublished - 2016
Event6th International Congress on Arsenic in the Environment - Stockholm, Sweden
Duration: 19 Jun 201623 Jun 2016
Conference number: 6

Conference

Conference6th International Congress on Arsenic in the Environment
Abbreviated titleAS 2016
Country/TerritorySweden
CityStockholm
Period19/06/1623/06/16

Programme Area

  • Programme Area 2: Water Resources

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