The origin of groundwater salinity in the Matanza-Riachuelo aquifer system, Argentina
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This work has been funded by the Groundwater Project in the Matanza-Riachuelo River Basin, supported by the Autoridad de Cuenca Matanza Riachuelo (ACUMAR, Argentina) through the Instituto de Hidrología de Llanuras “Dr. Eduardo J. Usunoff” (IHLLA). Part of the analysis was funded by the project CGL2009-2910-CO3, "Aquifer recharge and discharge processes, REDESAC," of the Ministry of Economy and Competitiveness of Spain. The first author thanks 'Argentina's National Council of Scientific and Technical Research (CONICET) for her doctoral fellowship. The authors are grateful for the laboratory assistance given by Romina Sanci from the Instituto de Geocronología y Geología Isotópica of the Buenos Aires University (INGEIS) with the isotopic analyses of organic matter. Finally, the authors would also like to extend thanks to the field and laboratory technicians of the IHLLA.Fecha de publicación
2023-02Editorial
ElsevierCita bibliográfica
Armengol, S.; Manzano, M.; Ayora, C.; Martínez, S. 2023. The origin of groundwater salinity in the Matanza-Riachuelo aquifer system. Argentina. Groundwater for Sustainable Development 20 (2023) 100879. https://doi.org/10.1016/j.gsd.2022.100879Revisión por pares
siPalabras clave
groundwater salinityold saline sources
modeling mixing
Matanza-Riachuelo aquifer system
Resumen
Groundwater salinization is a severe worldwide issue affecting many coastal aquifers by threatening their freshwater resources (Werner et al., 2013; Michael et al., 2017). The Matanza-Riachuelo River Basin (MRRB) is a coastal-continental basin that supplies fresh water to the Greater Buenos Aires conurbation, encompassing approximately 10% of Argentina's population. Among other environmental degradation issues, salinization is one of the most important processes affecting the MRRB. In this study, salinization across the MRRB was unraveled using major (Cl, HCO3, SO4, Na, Ca, Mg) and tracer (Br) solutes, together with stable (18O, 2H, 13C) and radioactive isotopes (3H, 14C). Three different saline end-members were identified: Upper Basin Slightly Saline (UBSS), Lower Basin Highly Saline (LBHS), and Lower Basin Hyper Saline (LBHPS). The salinity of the UBSS and the LBHPS end-members was associated with the Miocene Paraná Formation connate marine water, while the salinity of the LBHS end-member ...
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