globalchange  > 气候变化与战略
DOI: 10.1038/s41561-020-0557-6
论文题名:
The river–groundwater interface as a hotspot for arsenic release
作者: Wallis I.; Prommer H.; Berg M.; Siade A.J.; Sun J.; Kipfer R.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2020
卷: 13, 期:4
起始页码: 288
结束页码: 295
语种: 英语
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
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.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/169693
Appears in Collections:气候变化与战略

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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

Recommended Citation:
Wallis I.,Prommer H.,Berg M.,et al. The river–groundwater interface as a hotspot for arsenic release[J]. Nature Geoscience,2020-01-01,13(4)
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