http://repository.fuoye.edu.ng:80/handle/123456789/45 Thu, 16 Apr 2026 09:14:25 GMT 2026-04-16T09:14:25Z 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 http://repository.fuoye.edu.ng:80/handle/123456789/1111 Title: Integrated Geophysical Approach to Aquifer Delineation in Crystalline Basement Environment Authors: AKINRINADE Opeyemi Joshua, OLABODE Oladunjoye Peter Abstract: Aquifer delineation and characterization could be somewhat challenging in Crystalline Basement Complex environment, where they are associated with either saturated weathered Basement or fractured Basement. Increasing demand for water occasioned by domestic and industrial purposes resulted in delineation and characterization of aquifer properties at a site within the crystalline basement environment, where two boreholes have been drilled (BH1 and BH2). Very Low Frequency Electromagnetic (VLF-EM) and Electrical resistivity methods were used. Twelve (12) VLF-EM profiles of length 120 – 160 m, with 10 m station separation oriented in east-west direction and twenty-five (25) VES stations were occupied. Three peak positive raw/filtered real VLF-EM anomalies identified are presumed to be water-filled fractures or faults; thus implying possible locations suitable for groundwater development. Four geoelectric layers were delineated namely: top soil, clayey sand/sandy clay, weathered layer and basement rock. The weathered layer is characterized by resistivity values which range from 28 to 1309 Ωm, and thickness values of 2.9 to 15.1 m. Longitudinal unit conductance (S), Transverse unit resistance (T), and coefficient of Anisotropy (λ) have values ranging from 0.03 – 0.16 mhos, 382 – 8517 Ωm2, and 1.05 – 2.24 respectively. These results are indicative of the aquifer protective capacity, hydraulic conductivity, aquifer productivity and hydrogeologic significance. BH1 failed because it was drilled into the weathered basement at a location characterized by fairly low transverse resistance, while BH2 was drilled into a localized fractured basement with fairly high recharge attributed to extent of fracture network, high transverse resistance and coefficient of anisotropy. Thus, fracture network and its depth extent are of great importance in selecting fractured basement aquifer as groundwater development site. Integration of electromagnetic profiling with electrical resistivity methods has shown to be complimentary tools in determination of groundwater potential and reduces uncertainties in predicting drillable positions. Robust assessment of the weathered basement and fractured basement aquifer parameters has assisted in locating productive borehole position in basement complex environment. This creates opportunities for efficient resources management, and reduces the risk of sinking unproductive boreholes. Sat, 28 Nov 2015 00:00:00 GMT http://repository.fuoye.edu.ng:80/handle/123456789/1111 2015-11-28T00:00:00Z http://repository.fuoye.edu.ng:80/handle/123456789/978 Title: Geospatial modeling of electricity distribution network Authors: Dare-Alao, Damilola Mon, 22 Apr 2013 00:00:00 GMT http://repository.fuoye.edu.ng:80/handle/123456789/978 2013-04-22T00:00:00Z http://repository.fuoye.edu.ng:80/handle/123456789/975 Title: Hydrogeophysical investigation in selected parts of Irepodun/Ifelodun Local Government Area of Ekiti State, Southwestern Nigeria Authors: OLADAPO, MICHAEL ILESANMI; AYENI, OLAYIWOLA GRACE Abstract: Hydrogeophysical studies have been undertaken at Irepodun/Ifelodun local government area of Ekiti State, Nigeria. The area is underlain by the Basement Complex rocks. The study involved very low frequency electromagnetic (VLF-EM) and electrical resistivity methods. The results are presented as profiles, sections, curves, charts and maps. VLF-EM anomalies were evaluated using geoelectric soundings. Geoelectric sounding results enabled the determination of overburden thickness, transverse unit resistance, longitudinal unit conductance and coefficient of anisotropy (). Overburden thickness zones of 45 to 55 m were classified as high, 15 to 45 m as moderate and values less than 15 m as low. Afao, Obo, Iyin, Araromi, Iketun and Igede are of moderate to high groundwater potential, while other towns are of low groundwater potential. Longitudinal unit conductance showed that the area is characterized by sequence of good, moderate and weak groundwater protective capacities. Computed λ values revealed that the northern flank (Esure and Iropora) are underlain by charnockite of low λ (1.0 - 1.1) with other areas of high λ (1.1 - 2.1) underlain by granite and migmatite gneiss. Groundwater development is feasible in Araromi, Afao, Iyin, Obo, Iketun and Igede but marginally feasible in the other towns. Thus, groundwater potential of Irepodun/Ifelodun local government area is generally low Tue, 16 Jul 2013 00:00:00 GMT http://repository.fuoye.edu.ng:80/handle/123456789/975 2013-07-16T00:00:00Z http://repository.fuoye.edu.ng:80/handle/123456789/974 Title: Geoelectric Investigation of Aquifer Vulnerability within Afe Babalola University, Ado –Ekiti, Southwestern Nigeria. Authors: OGUNGBEMI, OLUWASEUN SAMUEL; BADMUS, O. G; AYENI, OLAYIWOLA GRACE; OLOGE, OLUWATOYIN Abstract: Many investigation techniques are commonly employed with the aim of estimating the spatial distribution of transmissivity and protective capacity of groundwater resources. Unfortunately, the conventional methods for the determination of hydraulic parameters such as pumping tests, permeameter measurements and grain size analysis are intrusive and relatively expensive. A non-intrusive and less-expensive geoelectric investigation involving vertical electrical sounding was carried out in some parts of the campus of Afe Babalola University, Ado Ekiti, Ekiti State, Nigeria. A total of fifty-nine (59) vertical electrical sounding (VES) data were acquired using R 50 D.C. resistivity meter within the campus which is underlain by the Precambrian basement rock of southwestern Nigeria. Following the interpretation of the VES data, maps and 2D-sections were generated. The geoelectric sections enabled the subsurface to be characterized into five geoelectric layers namely: Topsoil, clayey/sandy-clay, weathered layer, fractured basement and fresh basement. The assessment and analysis of the materials above the aquifers showed that longitudinal conductance (S) values ranged from 0.08438 to 0.73449 mhos; thus the area is classified into weak (0.1 – 0.19 mhos), moderate (0.2 – 0.69 mhos) and good protective capacity (0.7 mhos and above). The major aquifer delineated is the weathered/fractured basement aquifers. These aquifers are characterized by thick overburden, moderate/good protective capacity, moderate to relatively high value coefficients of anisotropy and low transverse unit resistance. This suggests that the materials above the aquifers act as seal, thus protecting the major aquiferous units. However, the aquifer matrix itself is relatively permeable. Areas with weak protective capacity are therefore vulnerable to infiltration of polluting fluid. Fri, 01 Nov 2013 00:00:00 GMT http://repository.fuoye.edu.ng:80/handle/123456789/974 2013-11-01T00:00:00Z http://repository.fuoye.edu.ng:80/handle/123456789/962 Title: Analysis of Seismic Time-Depth Conversion Using Geostatistically- Derived Average Authors: Olabode O. P., Enikanselu P. A. Abstract: Geostatistical techniques were used for seismic time-depth conversion over “Labod” field offshore Western Niger Delta Basin with the aid of surface seismic and borehole data. Gamma ray and resistivity logs in four exploratory wells were utilized to delineate formation lithologies (facies) and formation fluid content. The target horizon B (top of sand 2) was selected for seismic structural mapping. Two major faults (F1, F2) and three minor faults (F3, F4 and F5) were identified and interpreted on the seismic sections. Average velocities were first calculated from sonic logs. Geostatistical techniques - Kriging with External Drift (KED) and Simple Kriging - were employed to generate average velocity models used to convert the target B seismic time surface to depth in and away from well locations and depth maps were generated. The results of maximum percentage deviation computed among field-observed and computed depths were lower than 5% suggesting that the average velocity values estimated away from wells were reliable and applicable especially in areas where there is scarcity of well information. The Kriging with External Drift (KED) technique is particularly recommended because of the higher accuracy and denser data coverage. Finally, the method is cost effective because only few wells are required to achieve the expected results. Tue, 01 Jan 2008 00:00:00 GMT http://repository.fuoye.edu.ng:80/handle/123456789/962 2008-01-01T00:00:00Z http://repository.fuoye.edu.ng:80/handle/123456789/953 Title: Development of Computer Software for Seismic Refraction Data Interpretation and Engineering Parameters Determination Authors: Bamidele, Odunayo E.; Akintorinwa, O. J. Abstract: Computer software was developed for seismic refraction data interpretation and computation of engineering parameters as a means to ease the problem of cumbersomeness of the manual interpretation of seismic refraction data and computation of engineering parameters by adopting seismic refraction method of investigation. Necessary equations for the program were compiled, and the program algorithms were developed, fed into a computer interpreter, debugged and run. The program algorithm was written with Visual Basic Programming Language and the software was designed using Visual Basic tools.The software accepts and interprete Single On Shot and On and Reverse Shot seismic refraction data for planar and dipping interface. The developed software plots T-X graph and compute the layer velocities and thicknesses. Engineering parameters such as Fracture Frequency (n), Rock Quality Designation (RQD), Bulk and Young modulus and Poisson ratio (σ) which are used in subsurface engineering evaluation can also be computed using the software.Seismic refraction data for both planar and dipping interface were obtained and used in testing the efficiency of the software and the results correlate with that of manual interpretation and computation. Wed, 01 Jan 2014 00:00:00 GMT http://repository.fuoye.edu.ng:80/handle/123456789/953 2014-01-01T00:00:00Z http://repository.fuoye.edu.ng:80/handle/123456789/845 Title: Environmental Geophysics Authors: FUOYE Thu, 01 Jan 2015 00:00:00 GMT http://repository.fuoye.edu.ng:80/handle/123456789/845 2015-01-01T00:00:00Z http://repository.fuoye.edu.ng:80/handle/123456789/838 Title: Borehole Geophysics Authors: FUOYE Thu, 01 Jan 2015 00:00:00 GMT http://repository.fuoye.edu.ng:80/handle/123456789/838 2015-01-01T00:00:00Z http://repository.fuoye.edu.ng:80/handle/123456789/837 Title: Geophysics and Geothermal Energy Authors: FUOYE Thu, 01 Jan 2015 00:00:00 GMT http://repository.fuoye.edu.ng:80/handle/123456789/837 2015-01-01T00:00:00Z http://repository.fuoye.edu.ng:80/handle/123456789/834 Title: Electromagnetic Prospecting Methods Authors: FUOYE Thu, 01 Jan 2015 00:00:00 GMT http://repository.fuoye.edu.ng:80/handle/123456789/834 2015-01-01T00:00:00Z http://repository.fuoye.edu.ng:80/handle/123456789/833 Title: Groundwater Geophysics Authors: FUOYE Thu, 01 Jan 2015 00:00:00 GMT http://repository.fuoye.edu.ng:80/handle/123456789/833 2015-01-01T00:00:00Z