Browsing by Author "Osisanya, Wasiu O."

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    Application of second‑order geoelectric indices in determination of groundwater vulnerability in hard rock terrain in SW. Nigeria
    (Springer Nature, 2023-09-22) Olumuyiwa, Victor A.; Osisanya, Wasiu O.; Eyankware, Oghenenyoreme . M; Korode, Akinjide I.; Ibitoye, Taiwo A.
    The application of the VES geophysical technique to investigate groundwater potential and the aquifer vulnerability was carried out at Akure, southwestern part of Nigeria. Sixteen (16) VES points were selected using a Schlumberger array applied for the conduction of the VES. The ABEM Terrameter SAS 1000 was used and the maximum current electrode spacing (AB/2) was 100 m. A partial curve matching technique and computer iteration technique were applied in the interpretation of data using WINRESIST software, while Groundwater Modeling System (GMS) software was used to model the groundwater flow direction. The study revealed the presence of two to four layers of curve types, which include H (69%), HKH (19%), A (6%), and QH (6%) respectively. The second-order geoelectric parameters include longitudinal conductance (S), average transverse resistance (Tr), average longitudinal resistance (ρL), coefficient of anisotropy (λ), reflection coefficient (Rc), and resistivity contrast (Fc). The estimated aforementioned parameters range 0.004–1.03, 659.6–12,416.6 Ω/m2, 28.21–267.4 Ω-m, 58.82–303.26, 1–1.5, 0.33–0.97, and 2.01–57.33, respectively. The distributions of these parameters are revealed by the contour maps, which aid in the delineation of zones with different layer characteristics. The findings of this study can be used as a guide for making decisions on groundwater abstraction and management.