Abstract
Assessment of groundwater potential and aquifer protection capacity is essential in proffering solution to groundwater exploration challenges and contaminants invasion into the aquifers. In this study, 3D resistivity model of one hundred and forty-three (143) VES data acquired along a grid layout was generated. The VES data were processed and interpreted quantitatively to obtain geo-electric parameters and longitudinal conductance. The geo-electric parameters, longitudinal conductance values and georeferenced geographic coordinates were gridded using 3D gridding algorithm to generate resistivity and longitudinal conductance distribution model for the study area. The 3D resistivity models were presented as resistivity distribution models, slices, and depth maps. The result reveals variable resistivity ranges from 50 to 2800 Ωm, and an observable low resistivity values (30–160 Ωm) occupying larger part of the study area. The northeastern portion of the distribution model shows an anomalous high resistivity range between 1000 and 2000 Ωm. The variation in resistivity distribution could be ascribed to the heterogeneity of basement complex rocks. The resistivity model further reveals low fracturing intensity across the area, and a low to moderate groundwater prospect. The longitudinal conductance distribution model classified the area into poorly protected zone (43%), moderately protected zone (50%) and excellent protective zones (7%). Thus, 3D subsurface resistivity model of 1D sounding data has proven to be suitable for groundwater potentiality mapping and overburden protective capacity assessment in basement terrain.
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Arowoogun, K.I., Osinowo, O.O. 3D resistivity model of 1D vertical electrical sounding (VES) data for groundwater potential and aquifer protective capacity assessment: a case study. Model. Earth Syst. Environ. 8, 2615–2626 (2022). https://doi.org/10.1007/s40808-021-01254-w
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DOI: https://doi.org/10.1007/s40808-021-01254-w