Authors : M.I. Oladapo , K.A. Mogaji and O.O. Adeoye
Abstract: Integrated Very Low Frequency Electromagnetic (VLF-EM) and surface electrical resistivity surveys were conducted at the proposed sites for School of Earth and Mineral Sciences (SEMS) and Centre for Research and Development (CERAD) of the Federal University of Technology Akure Nigeria with a view of determining the feasibility of groundwater development in the sites. Thirteen (VLF) profiles were established on the West-East azimuth while station interval of 5 m was adopted for field data acquisition. Field values obtained from the VLF measurements have a maximum value of 9.7% thus indicating absence of major fractures. Linear features presumed to be minor fractures inferred from the filtered real map were further evaluated using electrical resistivity method. Thirteen Vertical Electrical Sounding (VES) locations were occupied at the locations delineated from the VLF results. Geoelectric sections generated from computer iterated sounding curves revealed 4 subsurface geoelectric/geologic layers consisting of topsoil, lateritic layer, weathered basement, fractured/fresh bedrock. The delineated weathered and fractured basement materials constitute shallow aquifer units in the study area. The depth to the bedrock across the study area varies between 2.8 and 15.3 m. The fractures delineated from the sounding curves are minor lineaments. The overburden thickness map shows thickness to be in excess of 10 m at the southwestern to central part of SEMS and at southeastern part of CERAD. The results of this research provide reliable background information that the groundwater potential of the area is generally low. VES 6 located within SEMS area and VES 1, 5 and 9 at the CERAD site are feasible points for groundwater development in the study area.
M.I. Oladapo , K.A. Mogaji and O.O. Adeoye , 2008. Hydrogeophysical Evaluation of Sites of the School of Earth and Mineral Sciences and Centre for Research and Development, Federal University of Technology, Akure, Nigeria. Online Journal of Earth Sciences, 2: 48-54.