2-D Electrical Resistivity Tomography for Groundwater Exploration in Hard Rock Terrain

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Author(s) Ayodeji Jayeoba | Michael Adeyinka Oladunjoye
Pages 156-163
Volume 4
Issue 4
Date April, 2015
Keywords Hydrogeological Potential, Alabata, 2-D Resistivity Imaging, Inversion, Partially Weathered/Fractured Layer, Groundwater

In an attempt to examine the hydrogeological potential of the recently acquired land for University of Ibadan Cooperative Housing Estate located at Alabata near Ibadan, south-western Nigeria, 2D electrical resistivity tomography (ERT) was utilized. The 2-D resistivity imaging technique involves the Wenner electrode array configuration. Field data were obtained at six electrical resistivity tomography lines with lengths varying from 140 m to 220 m. The field data were subjected to inversion in order to remove geometrical effects from the pseudo-section and produce an image of true depth and true formation resistivity using Res2DINv software. Three layers were revealed, which are top layer, weathered layer, and fractured/fresh basement rock. The overburden thickness is relatively shallow ranging from 3 m to 13.4 m. The resistivity of the fractured/fresh basement rock varies from 146-Ohm-m to 850-Ohm-m. In general, the results show that groundwater exploration and development is feasible in the study area.

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