Figure 2 - uploaded by Mohamed Haythem Msaddek
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L’atlas central Tunisien est caractérisé par des plis de direction NE-SW et des failles de direction NW-SE voir E-W formants des fossés d’effondrement. La faille de Sidi Ali Ben Aoun s’individualise avec une direction subméridienne avec un jeu décrochant senestre.
Cette région est caractérisée par des ressources en eaux limitées. Et vu l’exploitati...
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... The geological map shows that the region is characterized by Pleistocene lithology (slope scree, silt and coarse gralets) (Fig. 2). More than 1000 fractures have been lifted carbonate outcrops of the age Zebbag formation Albian to Cenomanian (lower and upper limbs) in the massifs of Zitoun, Lahfey and Ben Aoun which constitute the North West limit of the Horchane aquifer (Msaddek et al. 2013). The openings of the majority of fractures of different stations are small and do not exceed 2 cm in most of them, but which can reach 4 cm in rare cases. ...
... The dominant directions of the different fractures are those of families N130-160 and N50-80. According to the correlations of the water table Drilling of Horchane W-E, Msaddek et al. (2013) were found that transmissivity and permeability was quite high in the western part near the Ben Aoun fault, and they diminish towards the East while moving away from the big accident (Fig. 3). ...
... A similar behavior is noted for the water content curve (W %). A high (Msaddek et al. 2013) surface values reaching the 48% at 0.6 m, decreasing in depth to reach the 7% at 1.8 m. ...
Mediterranean countries are known worldwide by their significant contribution in the olive oil production. This generates large quantities of olive mill wastewater (OMW) which degrade land and aquatic environments near to the OMW storage sites. It contains the organic substances with high phenolic compounds concentrations as well as inorganic particles. In Tunisia, uncontrolled OMW disposal sites cause enormous problems that harm the environment in general and human health. Due to its production of olive oil in Tunisia, its OMW production and in particular its underground resources, the Sidi Bouzid region was chosen to carry out this multidisciplinary research. The aim of this study focuses on environmental characterization and the evaluation of these waste zones which are faced with significant environmental pollution. Using geophysical mapping (electrical resistivity tomography—ERT method), the OMW subsurface infiltration can be monitored. The spatial distribution of these wastes is defined and localized through the resistivity signature (ERT method), who’s lower resistivity values correspond to the OMW zones infiltration. Several ERT lines were located inside and outside the OMW pond of Ben Aoun, Sidi Bouzid region, Tunisia. Multiple ERT surface lines are measured to build the subsurface resistivity models. Published results of lithologic and IP geophysic are complementary with our ERT results which the flow of the wastes within the porous layers was manifested with conductive target surrounded by resistive levels. The movement of these contaminants was released based on numerous geochemical (pH, electrical conductivity—EC, organic matter—OM and the water content—W) and geotechnical analyzes (X-ray diffraction—XRD and Atterberg limits) to characterize any potential infiltration in the basement or the neighboring terrain. The results show that ERT can be provided us an efficient and a powerful method to control and monitor the movement of contaminants in OMW disposal sites.
