Integrated geoelectrical survey for groundwater and shallow subsurface evaluation: case study at Siliyin spring, El-Fayoum, Egypt

Siliyin spring is one of the many natural fresh water springs in the Western Desert of Egypt. It is located at the central part of El-Fayoum Delta, which is a potential place for urban developments and touristic activities. Integrated geoelectrical survey was conducted to facilitate mapping the groundwater resources and the shallow subsurface structures in the area. Twenty-eight transient electromagnetic (TEM) soundings, three vertical electrical soundings (VES) and three electrical resistivity tomography (ERT) profiles were carried out around the Siliyin spring location. The dense cultivation, the rugged topography and the existence of infra structure in the area hindered acquiring more data. The TEM data were inverted jointly with the VES and ERT, and constrained by available geological information. Based on the inversion results, a set of geoelectrical cross-sections have been constructed. The shallow sand to sandy clay layer that forms the shallow aquifer has been completely mapped underneath and around the spring area. Flowing of water from the Siliyin spring is interconnected with the lateral lithological changes from clay to sand soil. Exploration of the extension of Siliyin spring zone is recommended. The interpretation emphasizes the importance of integrating the geoelectrical survey with the available geological information to obtain useful, cheap and fast lithological and structural subsurface information.

[1]  T. Alkhalifah,et al.  Residual dip moveout in VTI media , 2005 .

[2]  Max A. Meju,et al.  Simple relative space–time scaling of electrical and electromagnetic depth sounding arrays: implications for electrical static shift removal and joint DC‐TEM data inversion with the most‐squares criterion , 2005 .

[3]  Giuseppe Rossi,et al.  Methods and tools for drought analysis and management , 2007 .

[4]  M. Pavan,et al.  Geoelectrical resistivity survey of the central part of Azraq basin (Jordan) for identifying saltwater/freshwater interface , 1992 .

[5]  Abelardo Ramirez,et al.  Electrical imaging at the large block test—Yucca Mountain, Nevada , 2001 .

[6]  J. D. Mcneill.  Use of Electromagnetic Methods for Groundwater Studies , 1990 .

[7]  H. Vereecken,et al.  Imaging and characterisation of subsurface solute transport using electrical resistivity tomography (ERT) and equivalent transport models , 2002 .

[8]  Lars Nielsen,et al.  Mapping of the freshwater lens in a coastal aquifer on the Keta Barrier (Ghana) by transient electromagnetic soundings , 2007 .

[9]  James Macnae,et al.  6. Time Domain Electromagnetic Prospecting Methods , 1991 .

[10]  P. Henderson,et al.  Saltwater intrusion into the freshwater aquifer in the eastern shore of Virginia: a reconnaissance electrical resistivity survey , 1999 .

[11]  R. A. Overmeeren,et al.  Aquifer boundaries explored by geoelectrical measurements in the coastal plain of Yemen; a case of equivalence , 1989 .

[12]  P. Capizzi,et al.  Study And Monitoring Of Salt Water Intrusion In The Coastal Area Between Mazara Del Vallo And Marsala (South-Western Sicily) , 2007 .

[13]  J. Adams,et al.  The Gravity-Geologic Technique of Mapping Buried Bedrock Topography , 1990 .

[14]  Chieh‐Hou Yang,et al.  Combined application of dc and TEM to sea‐water intrusion mapping , 1999 .

[15]  Evaluation of Electromagnetic Methods for Rapid Mapping of Salt‐Water Interfaces in Coastal Aquifers , 1982 .

[16]  R. Baker,et al.  The application of time-lapse electrical tomography in groundwater studies , 1998 .

[17]  Esben Auken,et al.  The application of the transient electromagnetic method in hydrogeophysical surveys , 2003 .

[18]  Newbold.  On the Geology of Egypt , 1848 .

[19]  Andrew Binley,et al.  Electrical resistance tomography. , 2000 .