气候变化领域集成服务门户(CCPortal): The river–groundwater interface as a hotspot for arsenic release

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DOI	10.1038/s41561-020-0557-6
	The river–groundwater interface as a hotspot for arsenic release
	Wallis I.; Prommer H.; Berg M.; Siade A.J.; Sun J.; Kipfer R.
发表日期	2020
ISSN	17520894
起始页码	288
结束页码	295
卷号	13 期号:4
英文摘要	Geogenic groundwater arsenic (As) contamination is pervasive in many aquifers in south and southeast Asia. It is feared that recent increases in groundwater abstractions could induce the migration of high-As groundwaters into previously As-safe aquifers. Here we study an As-contaminated aquifer in Van Phuc, Vietnam, located ~10 km southeast of Hanoi on the banks of the Red River, which is affected by large-scale groundwater abstraction. We used numerical model simulations to integrate the groundwater flow and biogeochemical reaction processes at the aquifer scale, constrained by detailed hydraulic, environmental tracer, hydrochemical and mineralogical data. Our simulations provide a mechanistic reconstruction of the anthropogenically induced spatiotemporal variations in groundwater flow and biogeochemical dynamics and determine the evolution of the migration rate and mass balance of As over several decades. We found that the riverbed–aquifer interface constitutes a biogeochemical reaction hotspot that acts as the main source of elevated As concentrations. We show that a sustained As release relies on regular replenishment of river muds rich in labile organic matter and reactive iron oxides and that pumping-induced groundwater flow may facilitate As migration over distances of several kilometres into adjacent aquifers. © 2020, The Author(s), under exclusive licence to Springer Nature Limited.
英文关键词	anthropogenic source; aquifer pollution; arsenic; biogeochemistry; concentration (composition); environmental factor; groundwater abstraction; groundwater flow; groundwater-surface water interaction; hydraulic conductivity; numerical model; oxide group; pollutant transport; pumping; river bed; spatiotemporal analysis
语种	英语
来源期刊	Nature Geoscience
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/206840
作者单位	College of Science and Engineering, Flinders University, Adelaide, SA, Australia; National Centre for Groundwater Research and Training, Flinders University, Adelaide, SA, Australia; School of Earth Sciences, The University of Western Australia, Crawley, WA, Australia; CSIRO Land and Water, Wembley, WA, Australia; Eawag, Swiss Federal Institute of Aquatic Science and Technology, Dübendorf, Switzerland; Institute of Biogeochemistry and Pollutant Dynamics, ETH Zurich, Zurich, Switzerland; Institute of Geochemistry and Petrology, ETH Zurich, Zurich, Switzerland; State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, China
推荐引用方式 GB/T 7714	Wallis I.,Prommer H.,Berg M.,等. The river–groundwater interface as a hotspot for arsenic release[J],2020,13(4).
APA	Wallis I.,Prommer H.,Berg M.,Siade A.J.,Sun J.,&Kipfer R..(2020).The river–groundwater interface as a hotspot for arsenic release.Nature Geoscience,13(4).
MLA	Wallis I.,et al."The river–groundwater interface as a hotspot for arsenic release".Nature Geoscience 13.4(2020).