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<p>Groundwater exploration in locations underlain by Precambrian basement complex formation can be a bit challenging, therefore, delineation of potential zones and appraisal of ease of probable infiltration of contaminants are imperative. In this study, vertical electrical soundings (VES) and 2D electrical resistivity tomography (ERT)) were used in three colleges within Federal University of Agriculture Abeokuta, Nigeria for delineation of secured groundwater potential zones (GPZs). The geo-electric parameters gotten from VES were used to calculate Dar Zarrouk parameters for better understanding of aquifer’s characteristics. The ranges of resistivity and thickness values of the topsoil, clayey soil, clayey-sand, weathered basement, and fractured/fresh basement as inferred by VES are 77–1755 Ωm, 0.3–2.0 m; 11–846 Ωm, 0.4–19.1 m; 51–164 Ωm, 1.0–6.5 m; 10–852 Ωm, 4.6–40.2 m and 55–7919 Ωm, respectively. The weathered and fractured basements constitute the aquiferous units in the area with the overburden thickness (OT) and resistivity ranging from 10.5 to 38.9&#xa0;m and 10.0 to 615.0 Ωm, respectively. The reflection coefficient range is between −0.78 and 1.00 while the aquifer protective capacity range is between 0.10 and 1.15. Based on reflection coefficient and OT values used to infer groundwater yield status, 41.7% of the total VES points indicated high grading, 45.8% showed medium yield and 12.5% exhibited poor potential. Three aquifer protecting competency zones were identified namely: good (4.2%), moderate (75%), and weak (20.8%). Traverses 1, 2 and 3 at Colleges of Plant Science and Crop Production, Physical Sciences, and Engineering, respectively show moderate to good GPZs based on ID resistivity models and 2D ERT sections. The results from the 2D image sections indicated low resistivity zones as saturated regolith regions, indicating aquifer units at more than 16 m depth. The study identified drilling zones with moderate to high groundwater potential suitable for sustainable campus water supply.The outcomes provides a useful guide for sustainable management of groundwater resources in FUNAAB and its surrounding areas.</p>

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Assessing groundwater potential and susceptibility in parts of Federal University of Agriculture, Abeokuta, Nigeria using geo-electrical method

  • 期刊论文

  • 发表日期：

    2025年11月21日

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  • S. A. Ganiyu,
  • S. A. Adediji,
  • P. O. Raji,
  • O. T. Azeez

摘要

Groundwater exploration in locations underlain by Precambrian basement complex formation can be a bit challenging, therefore, delineation of potential zones and appraisal of ease of probable infiltration of contaminants are imperative. In this study, vertical electrical soundings (VES) and 2D electrical resistivity tomography (ERT)) were used in three colleges within Federal University of Agriculture Abeokuta, Nigeria for delineation of secured groundwater potential zones (GPZs). The geo-electric parameters gotten from VES were used to calculate Dar Zarrouk parameters for better understanding of aquifer’s characteristics. The ranges of resistivity and thickness values of the topsoil, clayey soil, clayey-sand, weathered basement, and fractured/fresh basement as inferred by VES are 77–1755 Ωm, 0.3–2.0 m; 11–846 Ωm, 0.4–19.1 m; 51–164 Ωm, 1.0–6.5 m; 10–852 Ωm, 4.6–40.2 m and 55–7919 Ωm, respectively. The weathered and fractured basements constitute the aquiferous units in the area with the overburden thickness (OT) and resistivity ranging from 10.5 to 38.9 m and 10.0 to 615.0 Ωm, respectively. The reflection coefficient range is between −0.78 and 1.00 while the aquifer protective capacity range is between 0.10 and 1.15. Based on reflection coefficient and OT values used to infer groundwater yield status, 41.7% of the total VES points indicated high grading, 45.8% showed medium yield and 12.5% exhibited poor potential. Three aquifer protecting competency zones were identified namely: good (4.2%), moderate (75%), and weak (20.8%). Traverses 1, 2 and 3 at Colleges of Plant Science and Crop Production, Physical Sciences, and Engineering, respectively show moderate to good GPZs based on ID resistivity models and 2D ERT sections. The results from the 2D image sections indicated low resistivity zones as saturated regolith regions, indicating aquifer units at more than 16 m depth. The study identified drilling zones with moderate to high groundwater potential suitable for sustainable campus water supply.The outcomes provides a useful guide for sustainable management of groundwater resources in FUNAAB and its surrounding areas.