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

JOURNAL OF HYDROLOGY

卷:540

Article

Santoni, S.^1,2  Huneau, F.^1,2  Garel, E.^1,2  Vergnaud-Ayraud, V.³  Labasque, T.³  Aquilina, L.³  Jaunat, J.⁴  Celle-Jeanton, H.⁵ 

[1] Univ Corse Pascal Paoli, Fac Sci & Tech, Lab Hydrogeol, Campus Grimaldi,BP 52, F-20250 Corte, France

[2] CNRS, UMR 6134, SPE, F-20250 Corte, France

[3] Univ Rennes 1, CNRS, OSUR, Geosci Rennes,UMR 6118, F-35042 Rennes, France

[4] Univ Reims, EA 3795, GEGENAA, 2 Esplanade Roland Garros, F-51100 Reims, France

[5] Univ Bourgogne Franche Comte, UFR Sci & Tech, CNRS UMR Chronoenvironm 6249, 16 Route Gray, F-25030 Besancon, France

关键词: Residence time;    CFCs;    SF6;    Coastal aquifer;    Flow pattern;    Corsica;   

DOI  :  10.1016/j.jhydrol.2016.06.001

来源: Elsevier

【 摘 要 】

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-, Be+, Sr2+, O-18, H-2, C-13, H-3, 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. (C) 2016 Elsevier B.V. All rights reserved.

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