Journal
HYDROLOGICAL SCIENCES JOURNAL
Volume 66, Issue 4, Pages 600-621Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/02626667.2021.1882679
Keywords
aquifer; hydrodynamic; hydrogeochemistry; isotopes; chlorofluorocarbons (CFCs); sulphur hexafluoride (SF6); Colombia
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Funding
- University of Antioquia
- University of Montpellier
- CORPOURABA
- University of Rennes 1 - Plateforme Condate eau
- Evidence4Policy project (Unesco-IHE)
- COLCIENCAS [727]
- University of Antioquia [22326]
- International Atomic Energy Agency [22326]
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This study investigates the hydrodynamic functioning of the coastal phreatic aquifer in the Uraba region of Colombia, identifying fast response to precipitation, multiple recharge modes and dominant geochemical processes. Monitoring of various isotopes and dating techniques revealed recent recharge mixed with older waters (>40 years) in the aquifer system.
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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