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Hydrogeophysical delineation of aquifer vulnerability in parts of Nkalagu area of Abakaliki, se. Nigeria

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Abstract

In this study, Vertical Electrical Sounding (VES) method was employed in evaluating aquifer protective capacity/vulnerability of the study area. For the study, 20 VES survey was conducted using the Schlumberger configuration with maximum electrode spacing of 200 m. The evaluation of aquifer protective capacity was based on the following Dar- Zarrouk parameters: longitudinal conductance (S), transverse resistance (T), longitudinal resistance (ρL), and average transverse resistance (ρt). Results obtained from VES data suggested that the layer model ranges from 3 to 6 layers, it was observed that curve HK was the dominant curve type with 37% when compared to other curve types. Findings from S revealed that aquifer protective capacity ranges from poor to very good category and the middle part of the study area with high S value showed the area with high aquifer protective capacity when compared to other parts of the study area, high Tr value was observed in northwest part of the study area, such area could be referred to an area with high groundwater potential, map of ρL showed contour interval of 500 Ω-m that demarcates the study into saline, brackish and freshwater aquifer and high ρt value was observed in northwest and southwest part of the study. Plots from aquifer geometric properties; aquifer thickness, aquifer resistivity and aquifer conductivity range from 12.3 to 116.5 m, 150.6 to 498.6 Ωm and 0.0810–3 to 5.510–3 respectively. Contour maps of iso-resistivity revealed that as AB/2 increase with depth from 6 to 150 m the area becomes shaly.

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Authors and Affiliations

  1. Department of Geology, Faculty of Science, Ebonyi State University, Abakaliki, Nigeria

    Moses Oghenenyoreme Eyankware

  2. Geomoses Consultancy Limited, Warri, Delta State, Nigeria

    Moses Oghenenyoreme Eyankware

  3. Department of Geology, Federal University of Technology Owerri, Owerri, Nigeria

    Obinna Chigoziem Akakuru

  4. Department of Petroleum and Gas Engineering, University of Port Harcourt, Port Harcourt, Nigeria

    Oghenegare Emmanuel Eyankware

  5. TegaFej Consulting Services, Port Harcourt, Rivers State, Nigeria

    Oghenegare Emmanuel Eyankware

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  1. Moses Oghenenyoreme Eyankware
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  2. Obinna Chigoziem Akakuru
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  3. Oghenegare Emmanuel Eyankware
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Contributions

Conceptualization: [MOE]; methodology: [MOE, OCA]; formal analysis and investigation: [MOE, OCA]; writing—original draft preparation: [MOE]; writing—review and editing: [MOE, OEE Resources: [MOE]; supervision: [MOE].

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Correspondence to Moses Oghenenyoreme Eyankware.

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Eyankware, M.O., Akakuru, O.C. & Eyankware, O.E. Hydrogeophysical delineation of aquifer vulnerability in parts of Nkalagu area of Abakaliki, se. Nigeria. Sustain. Water Resour. Manag. 8, 39 (2022). https://doi.org/10.1007/s40899-022-00603-6

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