Risk of groundwater contamination widely underestimated because of fast flow into aquifers


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Output type: Journal article

UM6P affiliated Publication?: Yes

Author list: Hartmann, Andreas; Jasechko, Scott; Gleeson, Tom; Wada, Yoshihide; Andreo, Bartolome; Barbera, Juan Antonio; Brielmann, Heike; Bouchaou, Lhoussaine; Charlier, Jean-Baptiste; Darling, W. George; Filippini, Maria; Garvelmann, Jakob; Goldscheider, Nico; Kralik, Martin; Kunstmann, Harald; Ladouche, Bernard; Lange, Jens; Lucianetti, Giorgia; Martin, Jose Francisco; Mudarra, Matias; Sanchez, Damian; Stumpp, Christine; Zagana, Eleni; Wagener, Thorsten

Publisher: National Academy of Sciences

Publication year: 2021

Journal: PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA (0027-8424)

Volume number: 118

Issue number: 20

ISSN: 0027-8424

Languages: English (EN-GB)


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Abstract

Groundwater pollution threatens human and ecosystem health in many regions around the globe. Fast flow to the groundwater through focused recharge is known to transmit short-lived pollutants into carbonate aquifers, endangering the quality of groundwaters where one quarter of the world's population lives. However, the large-scale impact of such focused recharge on groundwater quality remains poorly understood. Here, we apply a continental-scale model to quantify the risk of groundwater contamination by degradable pollutants through focused recharge in the carbonate rock regions of Europe, North Africa, and the Middle East. We show that focused recharge is the primary reason for widespread rapid transport of contaminants to the groundwater. Where it occurs, the concentration of pollutants in groundwater recharge that have not yet degraded increases from <1% to around 20 to 50% of their concentrations during infiltration. Assuming realistic application rates, our simulations show that degradable pollutants like glyphosate can exceed their permissible concentrations by 3 to 19 times when reaching the groundwater. Our results are supported by independent estimates of young water fractions at 78 carbonate rock springs over Europe and a dataset of observed glyphosate concentrations in the groundwater. They imply that in times of continuing and increasing industrial and agricultural productivity, focused recharge may result in an underestimated and widespread risk to usable groundwater volumes.


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Last updated on 2021-21-09 at 23:21