Geo-spatial Classification of Vulnerability Zones using Lithological, Elevation and Geoelectric Parameters in a typical Basement Complex Environment

O. R. Olajide; I. A. Adeyemo and S. O. Olaogun

doi:10.4314/njbas.v29i1.2

E-ISSN 2756-4843 | ISSN 0794-5698

2022, Vol: 30, Issue: 2

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Original Research

Nig. J. Basic Appl. Sci.. 2021; 29(1): 13-22

doi: 10.4314/njbas.v29i1.2

Geo-spatial Classification of Vulnerability Zones using Lithological, Elevation and Geoelectric Parameters in a typical Basement Complex Environment

O. R. Olajide, I. A. Adeyemo and S. O. Olaogun.

Abstract
Lithology, elevation and four (4) geoelectric parameters were utilized in assessing the groundwater vulnerability at northwestern part of Akure, southwestern Nigeria. Vertical electrical sounding (VES) technique of electrical resistivity method was adopted for this work. A total of 224 VES data was acquired and interpreted both qualitatively and quantitatively. Three to five geo-electric layers were delineated across the area which corresponds to four geologic layers. The resistivity of the layers vary respectively from 6.9 - 550 Ohm-m, 60 - 2500 Ohm-m, 20 - 650 Ohm-m and 220 - 7900 Ohm-m in the topsoil, weathered layer, partially weathered basement/partially fractured basement and presumed fresh basement. Likewise the layer thicknesses also vary respectively from 0.4 - 4.0 m, 0.7 - 19.0 m and 4.0 - 60 m in the topsoil, weathered layer and partially weathered basement/partially fractured basement. The results were presented as topsoil (resistivity and thickness) and weathered layer (resistivity and thickness) maps. The six parameters consisting of lithology , elevation, topsoil (resistivity and thickness) and weathered layer (resistivity and thickness) were synthesized using an additive model in order to used to generate the aquifer vulnerability model map. The aquifer vulnerability model map shows that the area is of very low to moderate vulnerability. 5% of the area has very low vulnerability, 30% low vulnerability and 65% moderate vulnerability. This implies that the groundwater resources in the area are moderately safe.

Key words: Vertical electrical sounding (VES), groundwater, aquifer layer, vulnerability, vulnerability model map, lithology, elevation and geoelectric parameters.

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Pubmed Style

Olajide OR, . Geo-spatial Classification of Vulnerability Zones using Lithological, Elevation and Geoelectric Parameters in a typical Basement Complex Environment. Nig. J. Basic Appl. Sci.. 2021; 29(1): 13-22. doi:10.4314/njbas.v29i1.2

Web Style

Olajide OR, . Geo-spatial Classification of Vulnerability Zones using Lithological, Elevation and Geoelectric Parameters in a typical Basement Complex Environment. https://www.njbas-udus.com/?mno=21868 [Access: February 03, 2023]. doi:10.4314/njbas.v29i1.2

AMA (American Medical Association) Style

Olajide OR, . Geo-spatial Classification of Vulnerability Zones using Lithological, Elevation and Geoelectric Parameters in a typical Basement Complex Environment. Nig. J. Basic Appl. Sci.. 2021; 29(1): 13-22. doi:10.4314/njbas.v29i1.2

Vancouver/ICMJE Style

Olajide OR, . Geo-spatial Classification of Vulnerability Zones using Lithological, Elevation and Geoelectric Parameters in a typical Basement Complex Environment. Nig. J. Basic Appl. Sci.. (2021), [cited February 03, 2023]; 29(1): 13-22. doi:10.4314/njbas.v29i1.2

Harvard Style

Olajide, O. R. & (2021) Geo-spatial Classification of Vulnerability Zones using Lithological, Elevation and Geoelectric Parameters in a typical Basement Complex Environment. Nig. J. Basic Appl. Sci., 29 (1), 13-22. doi:10.4314/njbas.v29i1.2

Turabian Style

Olajide, O. R., and I. A. Adeyemo and S. O. Olaogun. 2021. Geo-spatial Classification of Vulnerability Zones using Lithological, Elevation and Geoelectric Parameters in a typical Basement Complex Environment. Nigerian Journal of Basic and Applied Sciences, 29 (1), 13-22. doi:10.4314/njbas.v29i1.2

Chicago Style

Olajide, O. R., and I. A. Adeyemo and S. O. Olaogun. "Geo-spatial Classification of Vulnerability Zones using Lithological, Elevation and Geoelectric Parameters in a typical Basement Complex Environment." Nigerian Journal of Basic and Applied Sciences 29 (2021), 13-22. doi:10.4314/njbas.v29i1.2

MLA (The Modern Language Association) Style

APA (American Psychological Association) Style

Olajide, O. R. & (2021) Geo-spatial Classification of Vulnerability Zones using Lithological, Elevation and Geoelectric Parameters in a typical Basement Complex Environment. Nigerian Journal of Basic and Applied Sciences, 29 (1), 13-22. doi:10.4314/njbas.v29i1.2

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