Browsing by Author "Adewoye, AO"
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Item Appraisal of the groundwater potential in Iwo township a part of Southwestern Nigeria(Faculty of Life and Physical Sciences, Babcock University, llisan Remo, Ogun state, Nigeria, 2021) Adewoye, AO; Olasehinde, PI; Folorunso, IOGroundwater exploration was carried out through applicable electrical resistivity investigation with the aim of delineating probable zones of groundwater prospect within the near-surface geological formation in the study area. The dominant rocks in the study area are migmatite gneiss, biotite /biotite-muscovite granite and potassic syenite which falls within the Crystalline Basement Complex of southwestern Nigeria. Forty (40) Resistivity Sounding were explored using Schlumberger arrangement with the current spacing (AB/2) of a hundred metre at purpose by ABEM resistivity meter. The sphere knowledge obtained were analysed quantitatively by iteration package “WINRESIST” and qualitatively by partial curve matching. Bedrock resistivity, longitudinal conductance, reflection co-efficient and overburden thickness, longitudinal conductance parameters were calculated and their plots were prepared also and used for assessing the aquifer prospects. The results show that the subsurface lithology consists generally of three to five layers which are QH. A, KH. K, HKH. H and HA -types resistivity curves mainly. The geo-electric layers display 3–5 horizons viz: the topsoil (34.0-63277.4 Ωm), clayey sand (7.9 -8322.1 Ωm), fractured bedrock (19.9 - 10347Ωm) and the fresh bedrock (55.5 -5461.6 Ωm). The overburden thickness isopach plot showed an overburden thickness varies of 5.0 to 39.5m with values larger than thirty metres within the study space. About 75% of the studied groundwater samples revealed low to medium potential zone, while 15% and 10% revealed high and very high potential zones respectively. Subsequently, the groundwater potential rating of the study area is viewed as normally low. A large portion of Northern and Eastern portions of studied areas which showed moderate to good protective capacityItem Characterization of Aquifer Potential Using Dar-zarrouk parameters in a Crystalline Basement, Southwestern, Nigeria(Faculty of Pure and Applied Sciences, Ladoke Akintola University of Technology, Ogbomoso, 2021) Adewoye, AO; Bayewu, OO; Folorunso, IOPotable groundwater is a rare resource in some part of Okeiho southwestern Nigeria, assessing and delineating its feasible zones of high potential using non-invasive geoelectric investigation is really vital so as to monitor the successful exploration of the underground water. The study area is underlain predominantly with coarse porphyritic granite and syenite including pyrozene diorite. Thirty six (36) Vertical electrical soundings (VES) were surveyed around built up areas using ABEM SAS 1000 Terrameter with potential and current electrode spacing varied from 0.5 to 15mand 1 to 160 m respectively with VES curves interpreted qualitatively and quantitatively using curve matching techniques. Geoelectrical properties such as weathered resistivity layer, Overburden thickness, weathered thickness layer, bedrock relief, basement resistivity, reflection coefficient and the Dar-Zarrouk parameters were determined from each VES point and contoured so as to distinguish the groundwater prospects within the studied area. Typical curves corresponding to VES data include A’ ,‘H’, ‘HKH’ and ‘KH’. The most prevalent curve –type is H-type, comprising of 67% curves observed while the ‘A’, ‘KH’ and ‘HKH’ types establish 22%, 8.3% and 2.7% .The thickness of the overburden ranges between 2.8 – 16.8 m ;the weathered layer thickness range from 1.4 – 14.1 m ; the basement resistivity ranges from 357 – 14760 Ωm; the longitudinal conductance ranges from 0.022 – 0.39 Ω-1 ,;the transverse resistance has values ranges from 53 – 4760 Ωm2 , and the electrical anisotropy has values ranges from 1 to 1.8.The northern, eastern and central portion is described by decrease in overburden thickness , weathered resistivity layer , total longitudinal conductance, indicating low aquifer potential, transverse resistance unit, total longitudinal conductance unit , and electric anisotropy values increases towards the southwestern part , reflecting moderate aquifer prospects. In such manner, the southwestern part of the studied portions are categorized as moderate groundwater prospects; while the northern and eastern part are categorized as area with poor groundwater prospect