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<p>This study employs an integrated approach involving geoelectrical, borehole logging, and geospatial methods to investigate groundwater potential and aquifer vulnerability in five local government areas of Rivers State, Nigeria: Ogba-Egbema-Ndoni, Obio Akpor, Port Harcourt, Akuku-Toru, and Bonny. Vertical electrical sounding, borehole lithologic data, and spatial modeling techniques were used to assess aquifer characteristics and map groundwater distribution. Within the context of a geographic information system, thematic layers comprising soil type, slope, rainfall, land use/land cover, lineament density, drainage density, and geology were created and weighted using a multi-criteria decision analysis. Bulk resistivity values ranged from 16 to 6469 Ω-meters, with low values indicating saturated sandy layers favourable for groundwater storage. Aquifer parameters exhibited notable spatial variability: porosity ranged from 0.17 to 0.69, hydraulic conductivity from 0.0001 to 0.6886&#xa0;m per day, and permeability from 1130 to 12,976 millidarcies. The resistivity of the unsaturated zone varied between 6.21 and 6557 Ω-meters. Formation factor values ranged from 1.1 to 16.71, tortuosity from 0.87 to 1.72, and the coefficient of anisotropy from 9.41 to 633,161.59. Transverse resistance ranged from 111 to 729,000 Ω-square meters, while longitudinal conductance ranged from 0.010 to 0.886 S. Aquifers were encountered at depths ranging from 9 to 33&#xa0;m, with thicknesses up to 15&#xa0;m. Geospatial analysis identified rainfall, geology, slope, and drainage density as the most influential factors controlling groundwater occurrence. This study provides a reliable framework for sustainable groundwater exploration and resource management.</p>

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Assessment of groundwater potential and vulnerability in rivers state, Nigeria using integrated geophysical, geological and geospatial techniques

  • 期刊论文

  • 发表日期：

    2025年7月21日

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  • N. B. Osuamkpe,
  • I. Tamunobereton-ari,
  • A. R. C. Amakiri,
  • J. Amonieah

摘要

This study employs an integrated approach involving geoelectrical, borehole logging, and geospatial methods to investigate groundwater potential and aquifer vulnerability in five local government areas of Rivers State, Nigeria: Ogba-Egbema-Ndoni, Obio Akpor, Port Harcourt, Akuku-Toru, and Bonny. Vertical electrical sounding, borehole lithologic data, and spatial modeling techniques were used to assess aquifer characteristics and map groundwater distribution. Within the context of a geographic information system, thematic layers comprising soil type, slope, rainfall, land use/land cover, lineament density, drainage density, and geology were created and weighted using a multi-criteria decision analysis. Bulk resistivity values ranged from 16 to 6469 Ω-meters, with low values indicating saturated sandy layers favourable for groundwater storage. Aquifer parameters exhibited notable spatial variability: porosity ranged from 0.17 to 0.69, hydraulic conductivity from 0.0001 to 0.6886 m per day, and permeability from 1130 to 12,976 millidarcies. The resistivity of the unsaturated zone varied between 6.21 and 6557 Ω-meters. Formation factor values ranged from 1.1 to 16.71, tortuosity from 0.87 to 1.72, and the coefficient of anisotropy from 9.41 to 633,161.59. Transverse resistance ranged from 111 to 729,000 Ω-square meters, while longitudinal conductance ranged from 0.010 to 0.886 S. Aquifers were encountered at depths ranging from 9 to 33 m, with thicknesses up to 15 m. Geospatial analysis identified rainfall, geology, slope, and drainage density as the most influential factors controlling groundwater occurrence. This study provides a reliable framework for sustainable groundwater exploration and resource management.