On the Application of Coefficient of Anisotropy as an Index of Groundwater Potential in a Typical Basement Complex of Ado Ekiti, Southwest, Nigeria

Main Article Content

A. I. Olayinka
E. A. A. Oyedele

Abstract

This paper examines the application of the Dar Zarrouk parameter, the Coefficient of Anisotropy to Groundwater Potential Evaluation in a typical Basement Complex Terrain of Ado-Ekiti Southwest, Nigeria. A regional Geoelectric Depth sounding was carried out across the metropolis using the Schlumberger electrode array. Resistivity-depth image in terms of layer thickness and resistivity was used to compute the Coefficients of Anisotropy for the VES locations occupied. Thematic maps of the geoelectric parameters were generated using the Concept of Geographical Information System (GIS). Comparative Map Analysis revealed that a range of 1.3 to 1.6 Anisotropy values was observed across the zones characterized by thick overburden, Weathered Basement Thickness in excess of 25m, low weathered basement resistivity, fractured bedrock and basement depressions in the study area. Anisotropy values ranging from 1.8 to 2.8 were observed across the basement ridges and zones characterized by thin overburden, Weathered Basement Thickness of generally less than 15m and Weathered Basement resistivity greater than 1500 Ω-m with least groundwater potential. The regions of Anisotropy values ranging from 1.3 to 1.6 are demarcated as high groundwater potential zones. Areas characterized by higher Anisotropy values can be associated with low porosity and permeability with less hydro geological appeal.

Keywords:
Anisotropy, basement, groundwater potential, index, overburden

Article Details

How to Cite
Olayinka, A. I., & Oyedele, E. A. A. (2019). On the Application of Coefficient of Anisotropy as an Index of Groundwater Potential in a Typical Basement Complex of Ado Ekiti, Southwest, Nigeria. Physical Science International Journal, 22(1), 1-10. https://doi.org/10.9734/psij/2019/v22i130119
Section
Original Research Article

References

Wright CP. The hydrogeology of crystalline basement aquifers in Africa. In: Wright CP, Burgess WC (eds). Hydrogeology of crystalline basement aquifer in Africa. Geological Society of London Special Publication. 1992;66:1–27.

Olayinka AI, Akpan EJ, Magbagbeola OA. Geoelectric sounding for estimating aquifer potential in the crystalline basement area around Shaki, Southwest Nigeria, Water Resources. 1997;8(1-2):71–81.

Mogaji K, Oladapo I. Hydrogeological evaluation of federal college of agriculture, Akure Campus, Ondo State. Online Journal of Earth Sciences. 2008;2(2):78-85.

Olorunfemi MO, Olorunniwo MA. Geoelectric parameters and aquifer characteristics of some parts of Southern Nigeria. Geologia Applicata, E. Idrogeologia. 1985;20:99–109.

Rao PJ, Rao BS, Rao MJ, Harikrishna P. Geo-electrical analysis to demarcate groundwater pockets and recharge zones in Champavathi River Basin, Vizianagaram District, Andhra Pradesh. J. Ind. Geophys. Union. 2003;7(2):105-113.

Rahaman MA. Recent advances in the study of the basement complex of Nigeria, In Precambrian Geology of Nigeria, Geological Survey of Nigeria, Kaduna South, 1988;11–43.

Ebisemiju FS. Ado-Ekiti Region- A geographical analysis and master plan. Alpha Prints. 1993;15-30.

Vander Velpen BPA. Resist version 1.0. M.Sc research project. ITC, Delft, Netherlands; 1988.

Olorunfemi MO, Ojo JS, Akintunde OM. Hydrogeophysical evaluation of the groundwater potential of Akure Metropolis, South-Western Nigeria. Journal of Mining and Geology. 1999;35(2):207–228.

Oladapo MI, Mohammed MZ, Adeoye OO, Adetola BA. Geoelectrical investigation of the Ondo state housing corporation estate, Ijapo Akure, Southwestern Nigeria. Journal of Mining and Geology. 2004;40(1):41- 48.

Olorunfemi MO, Okhue EJ. Hyrogeologic and geologic significance of a geoelectric survey at Ile – Ife, Nigeria. Journal of Mining and Geology. 1992;28:242-350.

Mallam A, Emenike EA. Preliminary findings of subsurface characteristics from direct current resistivity survey of the federal capital territory (FCT), Nigeria. Int. Jor. P. App. Scs. 2008;2(2):68-76.

Shemang EN-Jnr. Groundwater potentials of Kubanni river basin, Zaria, Nigeria from D C Resistivity Study. Water Resources. 1993;4(1&2):36-42.

Mallam A. Fresh basement: Revealed from resistivity method. Zuma Journal of Pure and Applied Science. 2004;6(1):6-9.

Omosuyi GO, Ojo JS, Enikanselu PA. Geophysical investigation for groundwater around Obanla – Obakekere in Akure Area within the Basement complex of South-Western Nigeria. Journal of Mining and Geology. 2003;39(2):109–116.

Adiat KAN, Olayanju GM, Omosuyi GO, Ako BD. Electromagnetic Profiling and electrical resistivity soundings in groundwater investigation of a typical basement complex – A case study of Oda Town Southwestern Nigeria. Ozean J. Appl. Scs. 2009;2(4):333-359.

Keller GV, Frischnecht FC. Electrical methods in geophysical prospecting. Pergamon Press: Oxford, UK. 1966; 523.