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Residence time, mineralization processes and groundwater origin within a carbonate coastal aquifer with a thick unsaturated zone

Abstract : This study aims at establishing groundwater residence times, identifying mineralization processes and determining groundwater origins within a carbonate coastal aquifer with thick unsaturated zone and lying on a granitic depression. A multi-tracer approach (major ions, SiO2, Br-, Ba+, Sr2+, 18O, 2H, 13C, 3H, Ne, Ar) combined with a groundwater residence time determination using CFCs and SF6 allows defining the global setting of the study site. A typical mineralization conditioned by the sea sprays and the carbonate matrix helped to validate the groundwater weighted residence times from using a binary mixing model. Terrigenic SF6 excesses have been detected and quantified, which permits to identify a groundwater flow from the surrounding fractured granites towards the lower aquifer principally. The use of CFCs and SF6 as a first hydrogeological investigation tool is possible and very relevant despite the thick unsaturated zone and the hydraulic connexion with a granitic environment.
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Submitted on : Wednesday, June 8, 2016 - 11:31:56 AM
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Sébastien Santoni, Frédéric Huneau, Emilie Garel, Virginie Vergnaud-Ayraud, Thierry Labasque, et al.. Residence time, mineralization processes and groundwater origin within a carbonate coastal aquifer with a thick unsaturated zone. Journal of Hydrology, Elsevier, 2016, 540, pp.50-63. ⟨10.1016/j.jhydrol.2016.06.001⟩. ⟨insu-01328624⟩

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