Abstract
The Vertical Electrical Resistivity surveys in the Sunshine Garden Estate have contributed to a better understanding of the basement complex of Southwestern Nigeria. Nine (9) vertical electrical sounding (VES) using the Schlumberger electrode array were interpreted and the results shows three (3) subsurface geoelectric layers within the study area. These are the weathered layer, topsoil, fresh/fractured basement. Groundwater pockets such as fractured zones, valley fills/basement depressions, and weathered zones were delineated in the study area. Weathered/partially weathered layer and weathered basement/fractured basement were the two major aquifer mapped out and these aquifers are characterized by thick overburden, found within basement depressions. The groundwater potential of the study area was zoned into low, medium and high potentials. Zones where the overburden thickness (which constitutes the main aquifer unit) is greater than 13m and of low clay composition (average resistivity value between 200 - 400Ωm) are considered zones of high groundwater potential. Area where the thickness of the aquifer ranges from 11-13m with less clay composition are considered to have medium groundwater potential and the areas where the thickness of the aquifer is less than 11m are considered to have a low groundwater. The VES station underlained by high and medium groundwater potential zones are envisaged to be viable for groundwater development within the area. Â
Highlights
IntroductionThe changes in electrical properties, thickness and lithological features of weathered bedrock materials usually make VES (vertical electrical sounding) data from basement complex terrain very difficult especially during interpretation
The changes in electrical properties, thickness and lithological features of weathered bedrock materials usually make vertical electrical sounding (VES) data from basement complex terrain very difficult especially during interpretation
The result of the geophysical investigation which involves very low frequency electromagnetic method(VLF-EM) were presented as profiles and vertical electrical sounding (VES) results were presented as depth sounding curves and Geoelectric sections
Summary
The changes in electrical properties, thickness and lithological features of weathered bedrock materials usually make VES (vertical electrical sounding) data from basement complex terrain very difficult especially during interpretation. The application of geophysics for both mapping of groundwater resource and for evaluation of water quality has increased dramatically. The vertical Electrical Sounding (VES) has proved very effective in groundwater investigation studies because it delineates subsurface structures identifying potential aquiferous zone for groundwater accumulation [2][3]. There is a need for adequate geophysical investigation of the area with the aim of evaluating groundwater potential zones of the study area. In cases where geological structure are not complicated, electrical resistivity methods can be used effectively and apparent resistivity can be estimated.Vertical Electrical Sounding(VES) is a non-invasive geophysical survey configuration that has become successful in the prospect for groundwater potential in the basement complex of Nigeria[4][5]
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