Abstract
Groundwater vulnerability mapping provides useful but limited information for developing protection plans of the resource. Classical vulnerability ranking methods often do not take into account complex hydrostratigraphy and never consider groundwater flow dynamics. The objective of this work was to test the potential of major ion chemistry to assess regional-scale intrinsic groundwater vulnerability. Because it reflects water–sediment and water–rock interactions, the new vulnerability index reflects both infiltration processes and groundwater hydrodynamics. The method was applied on a regional fractured bedrock aquifer located in the Becancour region of southern Quebec (Canada). In this region, hydrogeochemistry shows that freshly recharged groundwater evolves from (Ca, Mg)–HCO3 and Ca–SO4 to Na–HCO3 type with gradually increasing confinement conditions in the fractured aquifer and tends to Na–Cl type locally by mixing with trapped marine pore-water. The new method identified recharge areas as those of the highest vulnerability and gradually decreasing vulnerability as confinement of the aquifer increased. It also highlights local discontinuities in confinement that differ from the regional pattern. Results showed a good correlation between groundwater vulnerability estimated with the new method and nitrate occurrence in groundwater. Eighty-two per cent of all samples presenting detectable nitrate concentrations were characterized by a Hydrogeochemical Vulnerability Index greater than 9 (maximum is 10). The ability of the new vulnerability method to identify areas vulnerable to detectable nitrate concentrations was much higher than that deriving from the DRASTIC method. This work confirms that major ions chemistry contains significant information about groundwater vulnerability and could be used to improve groundwater resource management.
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We wish to thank an anonymous reviewer for his careful review and suggestions that greatly improved the manuscript. The authors thank the Quebec Ministry of Environment (Ministère du Développement durable, de l’Environnement et de la Lutte contre les changements climatiques), the Becancour River Watershed organization (organisme de bassin versant GROBEC) and the municipalities that have participated in financing and supporting this research.
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Meyzonnat, G., Larocque, M., Barbecot, F. et al. The potential of major ion chemistry to assess groundwater vulnerability of a regional aquifer in southern Quebec (Canada). Environ Earth Sci 75, 68 (2016). https://doi.org/10.1007/s12665-015-4793-9
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DOI: https://doi.org/10.1007/s12665-015-4793-9