Geophysical Evaluation for Evidence of Recharging the Pleistocene Aquifer at El-Nubariya Area, West Nile Delta, EgyptReportar como inadecuado




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With everincreasing demands on water resources, Egypt is facing increasing water needs,demanded by a rapidly growing population, by higher standards of living and byan agricultural policys. West Nile Delta represents a new agricultural areawhere the reclaimed lands are irrigated with groundwater in addition to surfacewater. The evaluation of groundwater aquifers in West Nile Delta area requiresinformation about the extension, depth and distribution and source ofrecharging these aquifers. In this work, an integrated study using geoelectric,geomagnetic, hydrogeologic and hydrochemistry investigations has been appliedto evaluate groundwater aquifers and to delineate subsurface structurespredominant in the basement rocks at El-Nubariya area, West Nile Delta, Egypt.Thirty-five Vertical Electrical Soundings VES have been applied to identifythe subsurface geoelctric layers predominant in the study area. As well as adetailed land magnetic survey has been carried out along the study area usingtwo automatic proton precession magnetometers with an accuracy of 1 nT. Thesesurveys allowed us to establish the subsurface structures and their relationwith the detected aquifers. The geoelectric results are illustrated along sevengeoelectric profiles and correlated with the lithologic and hydrogeologic dataof drilled wells. The third geoelectric layer represents the water saturatedzone aquifer with thickness varies from 14 m to 58 m, increasing to east andsoutheast directions. The hydrchemisty anlysis shows that the salinity of thewater aquifer ranges from 600 ppm in the southeast to 3900 ppm in the south.The major dominant dissolved salt is Nacl. In the east and southeast, the watertype becomes more NaSO4 which refers to dissolution of gypsum inaddition to fertilizers. The magnetic data have been analyzed using horizontalgradient and 3D magnetic modeling along the locations of geolectric profiles.The results indicate that the fault structures are trending in E-W, NW-SE andNE-SW directions. These faults confirm the results obtained from the wellgeolectric interpretation. These fault structures act as recharging paths fromlower brackish to upper fresh water aquifers.

KEYWORDS

Geoelectric; Geomagnetic; Aquifer; Groundwater; Hydrogeology

Cite this paper

Khalil, A. , Mansour, K. , Rabeh, T. , Basheer, A. , Zaher, M. and Ali, K. 2014 Geophysical Evaluation for Evidence of Recharging the Pleistocene Aquifer at El-Nubariya Area, West Nile Delta, Egypt. International Journal of Geosciences, 5, 324-340. doi: 10.4236-ijg.2014.53032.





Autor: Ahmed Khalil, Khamis Mansour, Taha Rabeh, Alhussein Basheer, Mohamed Abdel Zaher, Kamal Ali

Fuente: http://www.scirp.org/



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