A multi-tracer approach for understanding the functioning of heterogeneous phreatic coastal aquifers in humid tropical zones
2021
Campillo, Ana | Taupin, J.D. | Betancur, T. | Patris, Nicolas | Vergnaud, Virginie | Paredes, V. | Villegas, P. | Universidad de Antioquia = University of Antioquia [Medellín, Colombia] | Hydrosciences Montpellier (HSM) ; Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS) | Observatoire des Sciences de l'Univers de Rennes (OSUR) ; Université de Rennes (UR)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Rennes 2 (UR2)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE) | This study was supported by the collaboration of the University of Antioquia, University of Montpellier, CORPOURABA, University of Rennes 1 – Plateforme Condate eau, Evidence4Policy project (Unesco-IHE), project 22326 between the University of Antioquia and the International Atomic Energy Agency, and the fellowship Doctorado Nacional 727 by COLCIENCAS.
International audience
Mostrar más [+] Menos [-]Inglés. In many areas around the world, phreatic coastal aquifers are vulnerable to contamination and saltwater intrusion. This study aims to explore the hydrodynamic functioning of the coastal phreatic aquifer of the Uraba region, Colombia, based on the identification of hydrogeochemical processes and groundwater residence and transit times. Hydrodynamic data showed a fast response of the piezometric levels to precipitation with a maximum time lag of 48 h. Mean annual recharge was estimated at 19% with respect to precipitation. Another recharge mode is linked to infiltration from surface water, according to the hydrodynamic results. The main geochemical process identified is hydrolysis due to dissolved carbon dioxide, inducing silicate weathering and resulting in predominant HCO3-Ca-Mg facies. Monitoring of delta O-18 and delta H-2 compositions combined with H-3, C-14, chlorofluorocarbons (CFCs) and SF6 contents showed a fast recharge in the aquifer. Groundwater dating indicates recent waters mixed with older (>40 years) waters.
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