Joint Electromagnetic-Terrain Conductivity and DC-Resistivity Survey for Bedrock and Groundwater Characterization at the New Al-Obour City, Egypt

Authors

  • Esraa M. Azmy Department of Geophysics, Faculty of Science, Ain Shams University , Cairo, Egypt
  • Abdel-Kahlek El-Werr Department of Geophysics, Faculty of Science, Ain Shams University , Cairo, Egypt
  • Ahmed Helaly Department of Geophysics, Faculty of Science, Ain Shams University , Cairo, Egypt
  • Sultan A.S. Araffa Geomagnetic and Geoelectric Department, National Research Institutes of Astronomy and Geophysics (NRIAG), Helwan, Egypt
  • Karam S.I. Farag Department of Geophysics, Faculty of Science, Ain Shams University , Cairo, Egypt

DOI:

https://doi.org/10.46717/igj.56.1C.18ms-2023-3-29

Keywords:

Groundwater, Electromagnetic, Vertical Electrical Sounding resistivity, New Al-Obour City

Abstract

A multi-spacing electromagnetic-terrain conductivity survey profiles and vertical electrical resistivity soundings were carried out at New Al-Obour City, Northeastern Cairo. The chief purpose of this survey was to characterize the bedrock, and groundwater occurrence, and hence to image both the surface and subsurface structures. The water is used mainly to meet the demands of the agricultural sector in the area. Accordingly, a set of sixteen multi-spacing electromagnetic-terrain conductivity profiles and 11 vertical electrical soundings were done from September 2018 to March 2019. The data sets were transformed-inverted comprehensively with regard to stitched one-dimensional (1D) electrical resistivity smoothed-earth models. These sets were used efficiently in the interpretation of the geologic sequence of bedrock through successive conductive anomalies and electrically resistive. Remarkably, the obtained subsurface electrical resistivity structures are coincident with the mapped field geologic faults. The current study proved that a comprehensive multi-spacing electromagnetic-terrain conductivity and vertical electrical sounding resistivity survey could help optimize  geotechnical exploratory work. The results of the interpretation of geoelectrical data indicate that the elevation of the top of groundwater aquifer ranges from 60-70 m above sea level.

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Published

2023-03-24

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