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<p>This study investigates the groundwater potential and evaluates the aquifer properties of the proposed construction site within the University of Ilorin using the combination of ground magnetic and vertical electrical sounding (VES) techniques. Ground Magnetic data were primarily acquired in profile lines across the study area, revealing geological boundaries between granite-gneiss and biotite-schist due to sharp differences in magnetic anomalies. The vertical electrical sounding (VES) of 40 points delineate three to four subsurface geo-electric layers that include Topsoil/Laterite, Clayey-Sand, Weathered Basement (sandy-clay), Fracture Basement and Fresh Basement. Dar Zarrouk Parameters were used to characterize each aquifer unit based on its transmissivity, hydraulic conductivity, longitudinal protective overburden capacity and the evaluation of the groundwater potential of the aquifer. The results of this study show that the second and third geo-electric layers served as primary groundwater-bearing units, where higher aquifer thickness and depths were observed at VES 5, 9, 11, 16 and 18 locations making them the most viable locations for groundwater exploration. Moreover, the Dar Zarrouk parameters measured that high transmissivity values were observed in VES 5, 10, 11, 14 and 19, while the longitudinal protective capacity indicated weak to poor aquifer protection across the study area except at VES 9, 11 and 14, in which the evaluation of groundwater classified VES 5 and 11 location as high yield zones. The findings of this study highlight the importance of geophysical investigation for groundwater exploration prior to construction and emphasise the need for structural and hydrogeological controls.</p>

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Geophysical investigation of groundwater potential and aquifer properties using ground magnetic and vertical electrical sounding at the University of Ilorin, Nigeria

  • 期刊论文

  • 发表日期：

    2025年4月8日

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  • Gabriel Efomeh Omolaiye,
  • Sodiq Bamidele Adam,
  • Taofeeq Ayinde Issa,
  • Yusuf Magaji,
  • Kayode Abdulhameed Oniyangi,
  • Jimoh Ajadi,
  • Saminu Olatunji,
  • Oluwafemi Abdulmujeeb Oluyemoh,
  • Ojulari Bashiru Alaba

摘要

This study investigates the groundwater potential and evaluates the aquifer properties of the proposed construction site within the University of Ilorin using the combination of ground magnetic and vertical electrical sounding (VES) techniques. Ground Magnetic data were primarily acquired in profile lines across the study area, revealing geological boundaries between granite-gneiss and biotite-schist due to sharp differences in magnetic anomalies. The vertical electrical sounding (VES) of 40 points delineate three to four subsurface geo-electric layers that include Topsoil/Laterite, Clayey-Sand, Weathered Basement (sandy-clay), Fracture Basement and Fresh Basement. Dar Zarrouk Parameters were used to characterize each aquifer unit based on its transmissivity, hydraulic conductivity, longitudinal protective overburden capacity and the evaluation of the groundwater potential of the aquifer. The results of this study show that the second and third geo-electric layers served as primary groundwater-bearing units, where higher aquifer thickness and depths were observed at VES 5, 9, 11, 16 and 18 locations making them the most viable locations for groundwater exploration. Moreover, the Dar Zarrouk parameters measured that high transmissivity values were observed in VES 5, 10, 11, 14 and 19, while the longitudinal protective capacity indicated weak to poor aquifer protection across the study area except at VES 9, 11 and 14, in which the evaluation of groundwater classified VES 5 and 11 location as high yield zones. The findings of this study highlight the importance of geophysical investigation for groundwater exploration prior to construction and emphasise the need for structural and hydrogeological controls.