Combined Geoelectrical and Statistical Approach in Subsurface Structural Mapping for Groundwater Prospect at Oke-Odo, Iwo, Southwestern Nigeria

Adeniji, A. A. and Adagunodo, T. A. and Ajani, O. O. and Samson, T. K. and Usikalu, M.R. and Onumejor, C. A. (2020) Combined Geoelectrical and Statistical Approach in Subsurface Structural Mapping for Groundwater Prospect at Oke-Odo, Iwo, Southwestern Nigeria. Technology Reports of Kansai University, 62 (07). pp. 3411-3425. ISSN 0453-2198

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Abstract

This research is aimed at mapping the subsurface structures such as fracture, weathered basement and fresh basement for groundwater investigation at Oke-Odo, Iwo, Osun State, Nigeria using combined geoelectric and statistical approach. Six (6) vertical electrical resistivity sounding data are collected based on schlumberger electrode arrangement configuration and maximum current electrode spacing of AB/2 along 100 m within the study area. The vertical electrical sounding (VES) results presented as resist graph revealed the range of values for all the VES stations respectively. The depth ranges from (0.9 – 37.5 m), thickness ranges from (0.9 – 35.1 m) and resistivity ranges from (27.3 – 3353.4 ohms). These results were later used to generate 2-D geoelectrical maps of the subsurface study area, which revealed that the fractured-weathered basement varied, leading to diversity in groundwater prospects. A descriptive statistic was computed for resistivity, thickness and depths values respectively from the resist graph. The normality of the data was examined using the Shapiro-Wilk’s test while test of homogeneity of variance was carried out using the Levene’s test. Resistivity between layers were compared using the ANOVA followed by Duncan’s test for Post Hoc comparison while thickness and depth between layers were compared using the independent t-test. The modeled geoelectric and statistical approach on the groundwater potential revealed that groundwater yield was recorded in areas with large concentrations of fracture and weathering with the bedrock.

Item Type:	Article
Uncontrolled Keywords:	Groundwater exploration, Vertical electrical sounding, Statistical approach, Analysis of Variance (ANOVA), Precambrian Basement
Subjects:	Q Science > QA Mathematics Q Science > QC Physics
Divisions:	Faculty of Engineering, Science and Mathematics > School of Physics
Depositing User:	Mrs Patricia Nwokealisi
Date Deposited:	18 May 2022 15:15
Last Modified:	18 May 2022 15:15
URI:	http://eprints.covenantuniversity.edu.ng/id/eprint/15851

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