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Home  >  Volume 24 (2013)

Geoelectrical Subsurface Imaging for the Mapping of Leachate and Contaminant Plume around a Dumpsite near Capitol, University of Benin, South-South, Nigeria. by Alile O.M., Aigbogun C.O, Airen O.J., Okunzuwa I.S.Ikponmwen O.M. and Aidaghese N.B. (July, 2
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Abstract

A PASI earth meter was use to carry out a direct current electrical resistivity survey using the Vertical Electrical Sounding (VES) and Werner profiling techniques was used to investigate structurally, the presence of plume around waste site dump in university of Benin, Benin city Edo state, south-south Nigeria. From the analysis of field data and result of computer iteration, a maximum of six geoelectric layers were obtain. The geoelectrical interpretation of the one dimensional schlumberger array was done using ipi2win software,while the two dimentional resistivity data was interpreted using the Diprowin software. The clayey sand and sand zones constitute the major aquifer units in the study area. For the first transverse, the first layer have  resistivity and thickness value ranges from 21 –285ohm-m and  0m– 0.8 m respectively, The second layer resistivity values vary from 2960 – 3740 ohm-m while its thickness ranges from 2.0 m– 3.0m. The resistivity values of the third layer range from 3740– 4580 ohm-m and the thickness vary from 3.0m -5.0m. For the second transverse, the first layer has resistivity and thickness ranges from 6 - 620 ohm-m and 0-1.0m respectively. The second layer has resistivity and thickness ranges from 62 – 594 ohm-m and 1.0 - 2.0m respectively. The third layer has resistivity and thickness ranges from 1043 – 1834 ohm-m and 1.0 - 1.5m respectively. The fourth layer has resistivity and thickness ranges from 5668 – 17514 ohm-m and 1.0 - 3.0m respectively. The fifth layer has resistivity and thickness ranges from 167224 ohm-m and 2.0 - 5.0m respectively. The thickness of the overburden is 5.0 m. The 2-D resistivity structures show that zones with low resistivity values of (< 35 ohm-m) which indicate leachate saturation are not present in the study area. This study reveals that due to several factors, leachates do not exist outside the dumpsite and therefore do not pose a threat to groundwater in the study location.

Keywords: geoelectric interpretation, vertical electrical sounding, leachate, wenner profiling.

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