Open AccessGEOPHYSICAL INVESTIGATION OF GROUNDWATER POTENTIAL OF A SITE IN OBALE AREA OF AKURE, NIGERIA.
Author(s) -
Eebo Festus Olusola,
Yusuf Gbenga Ayodele
Publication year - 2021
Publication title -
international journal of engineering applied science and technology
Language(s) - English
Resource type - Journals
ISSN - 2455-2143
DOI - 10.33564/ijeast.2021.v06i01.010
Subject(s) - geology , electrical resistivity and conductivity , basement , groundwater , horizon , precambrian , geomorphology , electrical resistivity tomography , geophysics , geotechnical engineering , geochemistry , geometry , archaeology , geography , mathematics , engineering , electrical engineering
Electrical Resistivity method usingVertical Electrical Soundings (VES) were carriedout at a site in Aba-Oyo area FUTA Southgate area,Akure, Nigeria, with the aim to access groundwaterpotential of the site. The study area is underlain bycrystalline rocks of the Precambrian basementcomplex of the Southwestern Nigeria. Twelve (12)VES were carried out using Schlumbergerelectrode array configuration with AB/2from 1 to65m. The VES data generated were processed andinterpreted using partial curve matching methodand computer iteration techniques. The interpreteddata revealed three to four geoelectric sections withvaried thicknesses and resistivity. The top soil layerranges from 44 to 181?m, lateritic clay layerranges from 20 to 174?m, the weathered horizonresistivity ranges from 20.0 to 424.0?m while thecompetent rock/fresh rock has resistivity valuesgreater than 424.0.3?m. The top soil layerresistivity and thickness ranges from 44 to 181?mand 0.4 to 2m, the lateritic clay layer resistivity andthickness range from 20 to 174?m and 1.7 to 6.0mrespectively, the weathered horizon resistivityranges from 20.0 to 424.0?m and 1.4 to 7.4mrespectively while the competent rock hasresistivity values greater than 424.0?m and ?mrespectively. The third geoelectric layer constitutesthe aquiferous zone in the 4-layer geoelectricsection while the second geoelectric layer is theaquiferous zone in all the 3- layer geoelectricsections. VES station 2, 7, 9 stations shows goodgroundwater potential as revealed by the thickoverburden and weathered layer with lowresistivity values. VES stations 1, 4, 5, 6, 8, 10 and12 shows moderate groundwater potentials whileVES stations 3 and 11 are non-aquifereous innature.