http://repository.fuoye.edu.ng:80/handle/123456789/78 Thu, 16 Apr 2026 07:55:32 GMT 2026-04-16T07:55:32Z http://repository.fuoye.edu.ng:80/handle/123456789/1299 Title: INTEGRATED CHARACTERIZATION OF ILOKUN DUMPSITE AROUND ILOKUN ADO-EKITI, SOUTH-WESTERN NIGERIA. Authors: FASHINA, TIMILEHIN GBENGA Abstract: Refuse disposal is a major environmental problem in most Nigeria cities and towns. The leachates from such sites may infiltrate or seep into the subsurface layers and pollute groundwater. Therefore, integrated geophysical methods such as electromagnetic, magnetics and electrical resistivity methods were applied to characterize the subsurface and assess the impact of the leachate on the groundwater quality around Ilokun dumpsite, Ado-Ekiti Southwestern Nigeria.Two wells were selected for analysis and water samples collected for detailed physicochemical analysis. A total of eighttraverses were established, trending in the NW-SE and W-E direction. Both the VLF-EM and the magnetics data were acquired along the traverses established at station intervals of 5m. Of these eight traverses, five traverses were investigated using dipole -dipole technique for data acquisition with an electrode spacing of 5m with the expansion factor (N) ranging from 1-5. Seventeen (17) VES stations were occupied within the study area using the Schlumberger electrode array with maximum spread length (AB) ranging from 100m to 130m. The VES data were processed and interpreted by the method of partial curve matching and computer iteration technique to generate the subsurface model. The VLF-EM results showed series of conductive zones varying from highly conductive zones to moderately conductive zones. The geoelectric section generally revealed a maximum of four geoelectric layers which could be classified into three major geologic layers: the topsoil; the weathered layer and the Fresh basement. Thin layers of laterite were found in the subsurface beneath some traverses. The top soil resistivity varies from 30 ohm-m to 210 ohm-m and thickness ranging from 0.5m to 1.6m. The weathered layer resistivity varies from 6 ohm-m to 52 ohm-m and thickness ranging from 1.5m to 16.5m. The resistivity values of the basement varies vii from 1500 ohm-m to 13500 ohm-m.The results of the dipole-dipole 2-D resistivity structure correlated with that of electromagnetic profiles, magnetics and geoelectric sections revealed that the subsurface in the dump area is polluted by the infiltrated leachates. The elevation map of the entire area corroborates the downward flow of leachates emanating from the dumpsite as shown in the isoresistivity maps. The results of the physico-chemical analysis showed that the electrical conductivity, temperature, chloride, COD, DO, TDS, TSS, pH fall within WHO and FEPA’s standard for portable water. It was therefore concluded that the leachate from the dumpsite is gradually migrating towards the western part of the study area; thereby polluting the near surface and underground water within the area while areas along the control points and the second well are free from pollution. Tue, 01 Sep 2015 00:00:00 GMT http://repository.fuoye.edu.ng:80/handle/123456789/1299 2015-09-01T00:00:00Z http://repository.fuoye.edu.ng:80/handle/123456789/1192 Title: EOELECTRIC EVALUATION OF GROUNDWATER POTENTIALS OF FACULTY OF SCIENCE AND ITS ENVIRONS, FEDERAL UNIVERSITY OYE- EKITI PHASE TWO, SOUTH WESTERN NIGERIA Authors: DARAMOLA, OLUWAYOMI DAMILOLA; ADELUSI, A.O Abstract: A Geophysical integrated research work involving the use of Electrical Resistivity Very Low Frequency Electromagnetic methods Description: A Geophysical integrated research work involving the use of Electrical Resistivity (ER) and the Very Low Frequency Electromagnetic methods Thu, 01 Oct 2015 00:00:00 GMT http://repository.fuoye.edu.ng:80/handle/123456789/1192 2015-10-01T00:00:00Z http://repository.fuoye.edu.ng:80/handle/123456789/1181 Title: GEO-ELECTRIC SOUNDINGS FOR GROUNDWATER EXPLORATION IN PART OF PORT HARCOURT, RIVERS STATE, SOUTH-EASTERN NIGERIA. Authors: ONAYEMI, AYOMIDE OLUWATOBI; FATOBA, J.O Abstract: Groundwater is the water that exists in pore spaces and fractures in rocks and sediments beneath the water table. The need for groundwater has increased tremendously due to the unavailability and the contamination of surface water bodies by the intrusion of saline water and human activities. The geo-electric soundings were carried out in Eleme Port Harcourt, capital of Rivers state in order to delineate the subsurface geo-electric layers and the depth to the aquifer unit for groundwater development. Ten the schlumberger electrode configuration. The Pasi Earth Resistivity Meter used. The sounding curves were classified into five and QQ curves. The quantitative interpretation of the geo-sounding curves by partial curve matching and computer iteration revealed 5 geo-electric layers based on characteristic resistivity ranges. The layers are; topsoil, lateritic sand, sand, coarse sand and clay. The major aquifer units in the area are the sand and the coarse sand formations. Virtually all the VES points are good for groundwater development, because of the dominant sand and coarse sand formations, which is the major aquifer unit in the study area Description: For the purpose of this research, ten within the study area. These stations were taken at different locations within the study area. The schlumberger array was employed. Current was passed into the ground through a pair of current electrode and the resultant resistance were obtained through pair of potential electrode and then recorded on the resistivity recording sheets. The study was carried out by usingPasi Earth Resistivity meter, measuring tapes, current and potential electrode, crocodile clips and hammers Thu, 01 Oct 2015 00:00:00 GMT http://repository.fuoye.edu.ng:80/handle/123456789/1181 2015-10-01T00:00:00Z