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.

本研究采用综合地电和水化学方法来评估突尼斯西南部 Garâat Douza-Tebeddit 盆地 Plio-第四纪浅层含水层的地下水矿化过程。主要离子分析的解释表明，矿化受自然和人为过程控制。自然过程包括蒸发矿物（即石盐、石膏/硬石膏和泻石）的溶解、阳离子交换过程以及来自 Garâat Douza 排放区的 Sebkha 盐水的侵蚀。这些过程通过凯利图和扩展杜罗夫图得到证实，这表明浅层含水层地下水很可能，与不同类型混合，并经历了硫酸盐和氯化钠与旧停滞的氯化钠为主的盐水混合。人为矿化过程对应于通过灌溉水的回流浸出的氮肥的污染。地电调查表明，靠近排放区的浅层含水层的电阻率值相对较低，随着向补给区移动，电阻率值逐渐增加，表明 Sebkha 盐水侵入地表地下水位。