Abstract
The present study uses an integrate geoelectrical and hydrochemical approach to assess the processes of groundwater mineralization in the Plio-Quaternary shallow aquifer of the Garâat Douza-Tebeddit basin, Southwestern Tunisia. The interpretation of major ion analyses demonstrates that the mineralization is controlled by natural and anthropogenic processes. Natural processes include the dissolution of evaporate minerals namely halite, gypsum/anhydrite and epsomite, the cation exchange process and the encroachment of salt-water from the Sebkha of Garâat Douza discharge area. These processes are confirmed through the Kelley and expanded Durov diagrams, which indicate that the shallow aquifer groundwaters are likely, mixed with different types and have undergone sulphate and sodium chloride mixing with old stagnant sodium chloride dominated salt-water. The anthropogenic mineralization process corresponds to the contamination by the leached of nitrogen fertilizers through the return flow of irrigation waters. The geoelectrical survey demonstrated the predominance of relatively low resistivity values of the shallow aquifer near the discharge zone, which gradually increase as one moves away towards the recharge zones, indicating the encroachment of Sebkha salt water in the surficial water table.
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Mhamdi, A., Moussaoui, I., khalfi, C. et al. Assessment of groundwater mineralization processes in the Garâat Douza-Tebeddit shallow aquifer, Southwestern Tunisia: an integrated geoelectrical and hydrochemical approach. Carbonates Evaporites 37, 33 (2022). https://doi.org/10.1007/s13146-022-00781-6
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DOI: https://doi.org/10.1007/s13146-022-00781-6