Evaluation of Aquifer Protective Capacity and Groundwater Potential in Part of Iju, Akure-North, Ondo State, Nigeria
Keywords:Vertical Electrical Sounding, Very Low Frquency Electromagnetic, Groundwater Potential, Aquifer Protective Capacity
Groundwater potential and aquifer protective capacity of the overburden unit was evaluated in part of Iju, Akure North, Ondo State using integrated geophysical methods involving Very Low Frequency Electromagnetic (VLF-EM) profiling and Vertical Electrical Sounding (VES). Four major traverses were established of varying length extents. The VLF-EM measurements were taken along the four major profiles of 10 m station interval.
Forty two (42) Vertical Electrical Soundings were also conducted with half electrode spacing varying between 1 and 100 m and interpretation was done using the partial curve matching techniques and computer aided iteration. Five subsurface geological units were identified from geoelectric sections, consisting of the top soil, lateritic, weathered, partly weathered and fresh basement layers consecutively. For the first layer, resistivity
ranges between 23 and 323 ?m with values of thickness ranging between 0.5 and 2.2 m. The resistivity and thickness of the second (lateritic) layer range from 132 to 430 ?m and 1.6 to 4 m respectively. The resistivity of the weathered layer ranges from 4 to 94 ?m and variable thickness between 10 and 24.4 m. The fourth layer has a resistivity value range of 65 to 120 ?m and thicknesses between 20 and 30 m. The basement bedrock (fifth layer) has resistivity values between 770 and 820 ?m. The depth to bedrock ranges from 1.8 to 31 m. The geophysical data and the basement aquifer delineated were then used to evaluate the hydrogeological setting and aquifer protective capacity of the study area. The observation from the results shows that close to 70 % of the study area falls within the zones of low groundwater potential, 25 % falls within medium potential zones while only 5 % make up the high potential zones. 75 % of the study area constituted the weak to poor protective capacity zones.
C. A. Sullivan, J. R. Meigh & A. M. Giacomello, “The water poverty index: development and application at the community scale” In Natural resources forum 27 (2003) 189.
M. I. Oladapo, O. J. Akintorinwa, “Hydro Geophysical Study of Ogbese Southwestern, Nigeria” Global J Pure and Applied Sci. 13 (2007) 55.
J. F. Olorunfemi & C. O. Odita, “Land use and solid waste generation in Ilorin, Kwara State, Nigeria” Environmentalist 18 (1998) 67.
Henrient, “Direct Application of Dar Zarrok Parameter In Groundwater Survey”, Geophysical Prospect 24 (1976). DOI: https://doi.org/10.1111/j.1365-2478.1976.tb00931.x
M. I. Oladapo, M. Z. Mohammed, O. O. Adeoye, B. A. Adetola, “Geo-electrical Investigation of the Housing Corporation Estate Ijapo Akure, Southwestern Nigeria” Journ. Min Geol 40 (2004) 41.
G. O. Omosuyi, “Geoelectric Assessment of Groundwater Prospect and Vulnerability of Overburden Aquifer at Idanre South Western Part of Nigeria” Ozean Journ. Appl. Sci. 3 (2010) 19.
M. F. Walter, A. C. Braga, J. C. Dourado, “Resistivity (DC) Method Applied to Aquifer Protection studies” Rbgf 24 (2006) 573.
M. A. Rahaman & O. Ocan, “On relationship in the Precambrian migmatite-gneiss of Nigeria” Journal of Mining and Geology 15 (1978) 23.
A. N. Dempster, “Geological Map of Akure on 1: 250000, Sheet 61”, Geological Survey of Nigeria (1966).
V. O. Olarewanju, “Geochemistry of charnockitic and granitic rocks of the basement around Ado-Ekiti – Akure, Southwestern Nigeria” PhD Thesis, University of London (1981).
Y. A. Asiwaju-Bello, F. O. Olabode, O. A. Duvbiama, O. I. Iyamu, A. A. Adeyemo, & M. T. Onigbinde, “Hydrochemical evaluation of groundwater in Akure Area, South-western Nigeria, for irrigation purpose” Eur. Int. Journ. Sci. Technol. 2 (2013) 235.
A. Y. B. Anifowose, “Stabilization of lateritic soils as a raw material for building blocks” Bull. Eng. Geol. Environ. 58 (2000) 151.
O. O. Aladejana, A. Y. B. Anifowose, & B. J. Fagbohun, “Testing the ability of an empirical hydrological model to verify a knowledge based groundwater potential zone mapping methodology” Model Earth Syst Environ 2 (2016) 1.
O. F. Olabode, “Potential groundwater recharge sites mapping in a typical basement terrain: a GIS methodology approach” Journ Geovis Spat Anal 3 (2019) 5. DOI: https://doi.org/10.1007/s41651-019-0028-z
Y. A. Asiwaju-Bello, O. F. Olabode & M. T. Ogunsuyi, “Pollution potential and causative hydrogeochemical processes in unconfined aquifer systems in a typical urban setting: emphasis on recharge and discharge
areas” Applied Water Science 10 (2020) 52.
J. O. Owoseni, E. H. Tamarautobou & Y. A. Asiwaju-Bello, “Application of sequential analysis and geographic information systems for hydrochemical evolution survey, Shagari Environ, Southwestern Nigeria” Am Int Journ Contem Res 5 (2013) 38.
A. T. Adediji & M. O. Ajewole, “Vertical Profile of Radio Refractivity Gradient in Akure South-West Nigeria” Progress in electromagnetics research 4 (2008) 157.
S. Benson, C. R. Jones, “The combined EMT/VES Geophysical method of siting borehole” (1998) 54.
G. O. Omosuyi, A. Adeyemo & A. O. Adegoke, “Investigation of groundwater prospect using electromagnetic and geoelectric sounding at Afunbiowo, near Akure, Southwestern Nigeria” Pacific Journ Sci Technol 8 (2007) 172.
K. A. N. Adiat, G. M. Olayanju, G. O. Omosuyi & B. D. Ako, “Electromagnetic profiling and electrical resistivity soundings in groundwater investigation of a typical Basement Complex-a case study of Oda Town Southwestern Nigeria” Ozean Journal of Applied Sciences 2 (2009) 333.
E. T. Okhue, & M. O. Olorunfemi, “Electrical resistivity investigation of a Typical Basement Complex area-the Obafemi Awolowo University Campus case study” Journ Min Geol 27 (1991) 66.
C. I. Adenika, E. A. Ariyibi, M. O. Awoyemi, A. S. Adebayo, O. A. Dasho, & E. O. Olagunju, “Application of geophysical approach to highway pavement failure: a case study from basement complex terrain south-western Nigeria” Geo-Engineering 9 (2018) 1.
A. A. R. Zohdy, G. P. Eaton, & D. R. Mabey, “Application of surface geophysics to groundwater investigations” United State Geophysical Survey, Washington (1974).
M. O. Olorunfemi & E. T. Okhue, “Hydrogeological and Geologic significance of a geoelectric survey at Ile-Ife” Nigeria Journal of Mining and Geosciences Society 28 (1992) 221.
M. I. Oladapo & F. I. Afuda, “Hydrogeophysical Study of Parts of Charnockiteterrain of Akure Southwestern Nigeria” Global Journal of Pure and Applied Sciences, 23 (2017) 107.
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