Geoelectrical assessment of the impact of the Ilokun dumpsite, Ado-Ekiti Southwestern Nigeria, on surrounding groundwater aquifers

• Autorzy: Lateef T.A. , Eluwole A. B. , Adewa D. J.
• Języki publikacji: EN

Abstrakty

EN

The area around the Ilokun dumpsite, Ado-Ekiti was investigated with the aim of establishing the possible impact the contaminant plumes emanating from the dumpsite have on the subsurface aquifers. The Vertical Electrical Sounding (VES) field technique of the electrical resistivity method was adopted for the study, and the half-electrode spacing AB/2 varied from 1 to 65 m. A total of eight VES stations were occupied and a control VES point was located on the refuse dump. The VES data were interpreted quantitatively by partial curve matching and computer iteration, after which the geoelectric parameters were used to evolve a 2-Dimensional geoelectric section beneath the study area. The weathered layer beneath the control VES point was identified to be the aquifer unit, but the anomalously low resistivity of 18 ohm-m within the unit was interpreted as an evidence of pollution from conductive contaminant plume. The geoelectric section beneath VES 1 to 7 delineated four layers, these include the topsoil; the weathered layer; the fractured basement and the fresh basement. The resistivity and thickness range of the layers are 177 – 399 ohm-m and 0.7 – 1.2 m; 29 – 842 ohm-m and 1.0 – 3.4 m; 16 – 446 ohm-m and 4.5 – 45.5 m; and 289 – 2144 ohm-m respectively. The fractured layer constitutes the main aquifer unit beneath the seven VES points, but the anomalously low resistivity of 16 – 47 ohm-m within the fractured layer beneath VES 4, 5, 6 and 7 is suspected to be as a result of pollution from conductive contaminant plume emanating from the dumpsite. The fractured layer beneath VES 2 and 3 which does not show any evidence of pollution yet is at a risk of being contaminated, due to its interconnection with the polluted zone.

Słowa kluczowe

EN

Nigeria; aquifer; ground water; waste dump; dumping site; vertical electrical sounding; electrical resistivity; geophysics

• Wydawca: -
• Czasopismo: International Letters of Natural Sciences
• Rocznik: 2015
• Tom: 40
• Opis fizyczny: p.43-49,fig.,ref.

Twórcy

autor

Lateef T.A.

• Department of Physics, Ekiti State University, Ado-Ekiti, Nigeria

autor

Eluwole A. B.

• Department of Geology, Ekiti State University, Ado-Ekiti, Nigeria

autor

Adewa D. J.

• Department of Physics, Ekiti State University, Ado-Ekiti, Nigeria

Bibliografia

• [1] Ademilua, O.L. and Eluwole, A.B., 2013. Hydrogeophysical Evaluation of the Groundwater Potential of Afe Babalola University Ado-Ekiti, Southwestern Nigeria. Journal of Emerging Trends in Engineering and Applied Sciences. 4 (1): 77 - 83.
• [2] Badmus, B.S., Odewande, A.A., Ojelabi, E.A. and Oyedele, Y. (2001): Leachate Contamination Effects on Groundwater Exploration. African Journal of Environmental studies. 2: 38 - 44.
• [3] Bou-Zeid E. and El-Fadel M. (2004). Parametric Sensitivity Analysis of Leachate Transport Simulations at Landfills. Science Direct, Waste Management, 24: 681–689.
• [4] Eluwole A.B. and Ademilua O. L. (2014). Integrated Geophysical Investigations for the Development of a Sustainable Water Supply Scheme Within the Ekiti State University Campus, Ado-Ekiti, Southwestern Nigeria. International Journal of Scientific and Technology Research 3 (10): 294 – 304
• [5] Hussain, T., Hoda, A., and Khan, R. (1989): Impact of Sanitary Landfill on Groundwater Quality. Water, Air and Soil pollution 45: 191- 206.
• [6] Ugwu, S A and Nwosu, J I (2009). Effect of Waste Dumps on Groundwater in Choba using Geophysical Method. Journal of Applied Sciences and Environmental Management 13(1):85 – 89
• [7] Obasi, R.A., Ademilua O.L., and Eluwole A.B. (2013). Geoelectric Sounding for Groundwater Potential Appraisal Around the Northeastern - Southwestern Parts of the Federal Polytechnic Ado – Ekiti Campus, Southwestern Nigeria. Research Journal in Engineering and Applied Sciences. 2(3): 211-219.
• [8] Ogwueleka, T.C., (2003). Analysis of Urban Solid Waste in Nsukka, Nigeria. Journal of Solid Waste Technology and Management. 29(4): 239 – 246.
• [9] Olorunfemi, M.O., (2009). Groundwater Exploration, Borehole Site Selection and Optimum Drill Depth in Basement Complex Terrain. Water Resources, Special Publications Series 1, ISSN 0795-6495. 20p.
• [10] Rahaman, M.A., 1988. Recent Advances in the Study of the Basement Complex of Nigeria. (Edited by Nigeria Geological Survey), pp. 11-43.

Uwagi

Rekord w opracowaniu

Identyfikatory

DOI

10.18052/www.scipress.com/ILNS.40.43