Review of Electrical and Gravity Methods of Near Surface Exploration for Groundwater.
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Date
2014
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Publisher
Nigerian Journal of Technological Development
Abstract
ABSTRACT: The theory and practice of electrical and gravity methods of geophysics for groundwater exploration was reviewed with illustrations and data examples. With the goal of reducing cases of borehole/water-well failure attributed to the lack of the knowledge of the methods of geophysics for groundwater exploration and development, the paper reviews the basic concepts, field procedures for data acquisition, data processing, and interpretation as applied to the subject matter. Given a case study of
groundwater exploration in University of Ilorin Campus, the three important techniques of electrical method of groundwater
exploration are explained and illustrated using field data obtained in a previous study. Interpretation of resistivity data shows that an area measuring low resistivity (high conductivity), having thick pile of unconsolidated rock, and underlain by fracture crystalline is a ‘bright spot’ for citing borehole for groundwater abstraction in a basement complex area. Further to this, gravity method of groundwater exploration was discussed with field data from Wokbedilo community in Ethopia. Bouguer and reduced
gravity anomaly results were presented as maps and contours to demonstrate how gravity data can be inverted to map groundwater aquifers and subsurface geological structures during groundwater exploration.
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Keywords
Groundwater, gravity method, Electrical method, Aquifers, Crystalline rocks
Citation
Raji, W. O. (2014): Review of Electrical and Gravity Methods of Near Surface Exploration for Groundwater. Nigerian Journal of Technological Developemnt, Vol. 11(2), 31-38,