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Geohydraulic Investigation of Aquifer Parameters in Abak, Southern Nigeria

Journal of Geoscience and Environment Protection 2024年第5期12卷 289-301页

作者： Promise James Akpan Akaninyene Okon Akankpo Joseph Gordian Atat johnson cletus ibout Emmanuel Bassey Umoren Department of Physics University of Uyo Akwa Ibom Nigeria Department of Physics University of Nigeria Nsukka Nigeria

A geophysical investigation was carried out to characterize aquifer parameters and assess the groundwater condition in Abak, southern Nigeria. Vertical electrical sounding (VES) was carried out using Schlumberger configuration in 10 locations within the area. Both manual and computer interpretation of the resistivity data reveals three to four geoelectric units (laterite topsoil, medium-grained sand, coarse-grained sand, and sandy clay sand) which agrees with the lithologic log from existing boreholes. The aquifer layer was identified along the third formation with resistivity values ranging from 1239 - 5719 Ωm and aquifer depth ranging from 30.2 - 54.8 m. The aquifer thickness ranged from 24.2 - 43.7 m. Hydraulic conductivity ranged from 0.1206 m/day - 0.5026 m/day with an average value of 0.29403 m/day. Formation factor ranged from 14.55 - 16.64. Porosity ranged from 15.98% - 22.40%, with an average value of 19.64%. The aquiferous zone falls within the medium/coarse-grained sand. The aquifer is shallow, unconfined, and prolific with a little overburden formation of 13.5 m. The area shows good prospects for groundwater development.

关键词： Electrical Resistivity Porosity Formation Factor Hydraulic Conductivity

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Electrical geophysical evaluation of susceptibility to flooding in University of Nigeria, Nsukka main campus and its environs, Southeastern Nigeria

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Journal of Groundwater Science and Engineering 2023年第4期11卷 422-434页

作者： Daniel Nnaemeka Obiora johnson cletus Ibuot Department of Physics and Astronomy University of NigeriaNsukkaEnugu State

Flooding occurs when rainfall exceeds the absorption capacity of soil and causes significant environmental *** this study,electrical resistivity techniques were employed to assess the flood susceptibility of the study area by examining variations in electrical *** to flooding,Vertical Electrical Sounding(VES)and Electrical Resistivity Tomography(ERT)profiles were conducted to determine the variations in resistivity within subsurface lithologies exposed to the injected *** injected current penetrated the subsurface units characterised by resistivity ranging from 190.5Ω·m to 6,775.7Ω·m,42.3Ω·m to 7,297.4Ω·m,and 320.2Ω·m to 24,433.3Ω·m in the first,second and third layers,*** layers were identified as lateritic topsoil,medium-coarse brownish grained sand,and coarse pebbly blackish sand,*** calculated reflection coefficients between layers 1,2,and 3 reveal alternation in layers with values ranging from−0.04 to 0.66 and 0.36 to 0.95 for and,*** transverse resistivity,longitudinal resistivity and anisotropy ranged from 243.59Ω·m to 24,115.42Ω·m,199.61Ω·m to 14,950.76Ω·m,and 1.02 to *** derived from the ERT profiles reveal variations in resistivity,pinpointing areas of low resistivity which correspond to waterlogged and impermeable *** result of this study underscores the importance of integrated resistivity techniques in the study of floods,as it provides valuable insights into flood behaviour,and subsurface dynamics.

关键词： Anisotropy Vertical electrical sounding Electrical resistivity tomography Geoelectric layer Permeability

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