Integration of electrical resistivity and time-domain electromagnetic to investigate the subsurface stratigraphic conditions at Assiut Power Plant, Assiut, Egypt

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Abstract

The present work was proposed to prospect the subsurface stratigraphy and hydrogeological conditions for estimating the most suitable lithology and depth for hosting the power plant disposals without harming the underground water aquifers and soils. Two geophysical approaches were utilised to achieve the goal of this work, the Vertical Electric Sounding (VES) technique and Transient Time Domain Electromagnetic (TDEM). Seven VESes of AB/2 ranging between 300 and 900 metres were conducted reaching depths between 150 and 272 metres. On the other hand, “TDEM” was conducted on two localities in the site utilising laid 400 × 400 metres and 200 × 200 metres loop for transmitting EM field reaching about 1150 metres depth. The interpreted data show that the upper 200 metres represent 3 to 4 geoelectric layers whereas groundwater is found within the uppermost 100 metres and sometimes nearest to the ground’s surface. Moreover, at depths starting from 800 metres up to the maximum reached depth 1150 metres show a layer of almost similar resistivity which can be interpreted as a huge thickness of limestone, with particular moisture fractures. The similarity of the resistivity values guides to expect that the moisture represent some fluid seeps on the structural plains and does not rise to be an aquifer of open recharge sources. Therefore, the present study has conducted that it is safe for the power plant disposals to be buried from a depth beginning at least from 850 metres below the surface of the ground.

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NRIAG Journal of Astronomy and Geophysics
Volume 9, Issue 1
January 2020
Pages 471-482

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