TITLE
Assessment of aquifer vulnerability status and groundwater management studies using integrated geophysical techniques in Ewekoro South-West Nigeria
AUTHOR(S)
SA; Makinde, V; Alatise, OO; Edunjobi, HO and Ogunkoya
ABSTRACT
Twenty-five vertical electrical soundings and ten 2D electrical resistivity tomography profiles were undertaken at Ewekoro District in Ogun-State, Nigeria. The work encompassed the utilization of Schlumberger and Wenner Array. Subsurface profiles were obtained using Direct Current Resistivity (DCRE) of Vertical Electrical Sounding using AGI Super-sting Earth Resistivity meter with schlumberger configuration; current electrode spacing (AB/2) ranging from 1.0 to maximum of 200m and the potential electrodes (MN/2) were consequently changed from 0.25 m to 5.0 m respectively which was further complemented by application of 2D electrical resistivity tomography (ERT) adopting Wenner array of electrode spacing of 10 m for the profile length of 200 m was maintained to attain a reading and imaging within the depth range of aquifer in the area for the effective characterization of the subsurface structures and delineation of the underlying aquifer. The interpretations of acquired resistivity data were carried out with manual procedures coupled with Resist, RES2DINV and Surfer software programs for VES, 2D-ERT and contouring respectively. The results of the hydraulic conductivity (K) cum hydraulic resistance (C) for the protective layers were estimated from the geoelectrical parameters estimated have values ranging from 0.00815 cms^ (-1) (VESEWE24) to 5.484 cms^(-1) (VESEWE1) and 0.0075day^(-1) (VESEWE21) to 15445.98 day^(-1) (VESEWE25) respectively. AVI rating implications revealed that the study area is dominantly characterized by Extremely High Vulnerability (EHV); most of the locations were extremely high (88%) while VESEWE23 and VESEWE24 (8%) exhibited high vulnerability status and only VESEWE25 depicted low vulnerability status (4%).
DOI
https://doi.org/10.62252/NSS.2025.1033
PAGES: 549-573
How to cite this article:
Ishola, SA; Makinde, V; Alatise, OO; Edunjobi, HO and Ogunkoya, CO. 2025. Assessment of aquifer vulnerability status and groundwater management studies using integrated geophysical techniques in Ewekoro South-West Nigeria. Naturalis Scientias, 2 (2): 549-573. DOI: https://doi.org/10.62252/NSS.2025.1033. www.naturalisscientias.com.