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Evolution of the chemical and isotopic composition of groundwater under a semi-arid climate; the case of the Cenomano-Turonian aquifer within the Essaouira basin (Morocco)

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Abstract

This study evaluated how the chemical and isotopic composition of the groundwater in the Cenomano-Turonian aquifer of the Essaouira basin from Morocco has changed in response to low annual rainfall associated with climate change during the period 1995–2018. The study of the chemical composition of groundwater shows a Cl–Ca–Mg type facies which was maintained during the observation period (1995–2018). The electrical conductivity (EC) and the Cl− content of groundwater increased during the study period in response to low rainfall with a mean values range from 1214 (1995) to 2482 µs/cm (2018) for EC and from 11.36 (1995) to 14 meq/L (2018) for Cl−. Stable isotope measurements indicate that the Cenomano-Turonian aquifer is recharged by rainfall of Atlantic origin. Levels of 18O during the period 2007 and 2016 were generally stable with slight fluctuations (≈ 1‰) that may be due to analytical errors, suggesting that climate change has no effect on the isotopic signature of groundwater in the study area. Tritium levels in groundwater decreased between 2007 and 2016, possibly due to low recharge rates associated with low annual rainfall during this period.

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Acknowledgements

The authors are grateful to Editor-in-Chief, the associate editor who handled this manuscript and the anonymous reviewers who greatly improved an early version of the manuscript.

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Authors and Affiliations

  1. Département de Géologie, Ecole Normale Supérieure, LGE-ENS, Hay Hassani, Route d’Essaouira, BP 2400, Marrakech, Morocco

    Mohammed Bahir, Abdelmalek Goumih & Salah Ouhamdouch

  2. Mohammed VI Polytechnic University, Hay My Rachid, 43150, Ben Guerir, Morocco

    Driss Ouazar

Authors
  1. Mohammed Bahir
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  2. Driss Ouazar
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  3. Abdelmalek Goumih
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  4. Salah Ouhamdouch
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Correspondence to Mohammed Bahir.

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Bahir, M., Ouazar, D., Goumih, A. et al. Evolution of the chemical and isotopic composition of groundwater under a semi-arid climate; the case of the Cenomano-Turonian aquifer within the Essaouira basin (Morocco). Environ Earth Sci 78, 353 (2019). https://doi.org/10.1007/s12665-019-8349-2

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