IIARD International Institute of Academic Research and Development

RESEARCH JOURNAL OF PURE SCIENCE AND TECHNOLOGY (RJPST )

E-ISSN 2579-0536
P-ISSN 2695-2696
VOL. 8 NO. 3 2025
DOI: 10.56201/rjpst.vol.8.no3.2025.pg20.42

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Geoelectric Investigation for the Subsurface Characterization of Groundwater in Some Parts of Onna Local Government Area of Akwa Ibom State, Nigeria

Udofot, S U, Amechi, B U

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Abstract

This study focused on the Geoelectric investigation of the subsurface characterization of groundwater in some parts of Onna Local Government Area of Akwa Ibom State. A total of Twenty (20) vertical electrical soundings were conducted using Schlumberger and Wenner configurations in some selected locations. Characterization of subsurface formations for groundwater using geoelectric methods. The probing was done using the ABEM Tarrameter SAS 300B, with maximum electrode spacing of 400m (for Schlumberger) and 140m (for Wenner array). The field data were analyzed using IP12 WIN software to obtain the subsurface resistivities and the overburden thicknesses of different VES points within the study area. In this study, the aquifer properties of transmissivity, storativity and hydraulic conductivity were calculated using the Dar Zarrouk parameters. The geoelectric section of the study area comprises the topsoil, clayed sand, gravels, coarse sand, igneous rock and other geological formations were obtained. The resistivity values of the geoelectric section of profile A varies from 2.25?m – 280,000?m and that of profile B varies from 2.25?m – 640,000?m. The thickness produced ranges from 0.512m - 45.1m and it shows that the area is endowed with productive aquifers for portable water production. The Isopach maps of two layers (2 and 3) were obtained by plotting the coordinates against the thicknesses of those layers across the 20 VES points using Surfer 28 software. The maps showed two major areas: the valley and hilly ground; some VES points shared similar characteristics and thicknesses. The iso-resistivity maps of the area were obtained at two different depths (30m and 100m). The coordinates across 15 VES points were plotted against apparent resistivity values at 30m and 100m across 15 VES points using Surfer 28 software. The iso-resistivity maps showed variation in resistivity with different colouration, indicating the apparent resist

keywords:

Geoelectric method, Characterization, Groundwater, Dar zarrouk parameters

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