Abstract
The Motril-Salobreña coastal aquifer (SE Spain) is under high anthropogenic pressure due to the changes in river infiltration, irrigation and pumping. There are several uncertainties regarding how groundwater flows from the recharge areas to the discharge areas, and how long groundwater circulates in the aquifer due to the presence of layers with different hydraulic conductivity. This study constrains the age distribution in the aquifer by dating water samples taken at three different locations (recharge sector, intermediate sector and discharge sector) and at variable depths. The environmental tracers used were δ18O/δ2H, 4He, 3H/3He, 85Kr, and 39Ar. The groundwater dating allows to define the flow distribution and preferential flowpaths, to determine the mean groundwater residence times in the system and to establish the connection between age distribution and saltwater intrusion processes. Mean groundwater residence times range from recent to ~170 years, with the presence of young water in almost all the areas of the aquifer at a shallow depth and an age gradient at deeper locations in the discharge zone. The presence of the salt wedge increases the age mixing processes. The groundwater flow in the shallow part of the aquifer (0–50 m depth) turns out to be fast, with a residence time lower than 5 years, while the flow in the deeper parts (50–150 m depth) is slower and groundwater has at least 170 years.
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Acknowledgements
This study was supported by project CGL2016-77503-R, which was funded by the Ministerio de Economía y Competitividad (Government of Spain), by the research group RNM-369 of the Junta de Andalucía and by the Marie Curie International Outgoing Fellowship (624496).
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Sánchez-Úbeda, J.P. et al. (2018). Groundwater Age Dating in Motril-Salobreña Coastal Aquifer with Environmental Tracers (δ18O/δ2H, 3H/3He, 4He, 85Kr, and 39Ar). In: Calvache, M., Duque, C., Pulido-Velazquez, D. (eds) Groundwater and Global Change in the Western Mediterranean Area. Environmental Earth Sciences. Springer, Cham. https://doi.org/10.1007/978-3-319-69356-9_33
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DOI: https://doi.org/10.1007/978-3-319-69356-9_33
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