Abstract
The climatic conditions of arid regions are characterized by high temperatures, low precipitation and high evapotranspiration rates that can explain the reduced recharge of aquifers. Thus, in these regions, there are some problems related to the groundwater quality and recharge that makes worse the problem of groundwater supply. A model, taking into account ternary mixtures, is presented and applied to a case study: the aquifer of San Luis Potosi valley located in the highlands of the central part of Mexico. In this valley, four hydrochemical facies were identified that correspond to the Ca–Na + K–HCO3, Na + K–Ca–HCO3, Ca–HCO3 and Ca–SO4 types. From this characterization, it was found out that the recharge area (known as Bledos Graben) is located at the SE of the valley; the deep water flow comes from there (Villa de Reyes and Alvarez Range) to the center of the valley. Mixture fractions were obtained by using chlorides and fluorides as conservative elements, from which it was possible to quantify the contribution of each member to the groundwater quality. According to these results, the contributions to the water extracted from this aquifer are as follows: shallow flows 50%, deep flows from Villa de Reyes 27%, and flows coming from the Alvarez Ranges about 15%.
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Acknowledgments
The authors would like to thank Professor Brent Handy, from the Faculty of Chemistry of the UASLP, for his comments on the orthography of this manuscript. Thanks are also expressed to anonymous referees and to J. Lucero Hernandez Martinez for her contribution.
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Ramos-Leal, J.A., Martínez-Ruiz, V.J., Rangel-Mendez, J.R. et al. Hydrogeological and mixing process of waters in aquifers in arid regions: a case study in San Luis Potosi Valley, Mexico. Environ Geol 53, 325–337 (2007). https://doi.org/10.1007/s00254-007-0648-3
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DOI: https://doi.org/10.1007/s00254-007-0648-3