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Pure Appl. Geophys. 173 (2016), 12891303 2015 Springer Basel
DOI 10.1007/s00024-015-1173-z Pure and Applied Geophysics
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Web End = Electrical Resistivity Tomography (ERT) Applied to Karst Carbonate Aquifers: Case Study from Amdoun, Northwestern Tunisia
BELGACEM REDHAOUNIA,1 BATOBO OUNTSCHE ILONDO,2 HAKIM GABTNI,1 KHOMSI SAMI,1,3 and MOURAD BDIR1
AbstractThe Amdoun region is characterized by a high degree of karstication due to the climate impact (1500 mm year-1) and the development of fracture network.Survey using electrical resistivity tomography (ERT) is deployed to provide a cost-effective characterization of the subsurface karst environments. A total of seven ERT proles with lengths of 315 m were evaluated at the Bja governorate (NW Tunisia). The area represents a small syncline of Boudabbous limestone rocks (Lower Eocene), which is covered by a thin layer of clay. In this study, an ERT survey was conducted to examine the spatial distribution and shape of underground cavities in the karst area in Jebel Sabah anticline and An Sallem-Zahret Medien syncline. In this study, geological, hydro-geological and electrical resistivity tomography (ERT) methods were applied to determine the geometry of the perched aquifer in the Amdoun region (NW Tunisia). The area is characterized by fractured and karstic limestone aquifer of Late Cretaceous (Abiod Fm.) and Lower Eocene (Boudabbous Fm.).The aquifers have a karstic functioning and drain aquifers of economical interest, despite some wells exploiting them. Seven resistivity proles were conducted along the survey area at three sites. The orientation, extension and the degree of inclination of those proles are shown in the location map. The correct resistivity data were interpreted using Earth Imager 2D software. The results of the interpreted geo-electrical sections showed that the resistivity of the carbonate aquifer varied between 2.5 to over 5794 Xm. The thickness of the perched aquifer ranged from 15 to 50 m, while its depth from the surface lies between 10 and 60 m. The ERT not only provided precise near surface information, but was also very useful for establishing the 3D geometry and the position of several potential cavities and karts. The results show...