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SA Ugwu
HO Nwankwoala
SN Worlu

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SA Ugwu
HO Nwankwoala
SN Worlu

Issues in Scientific Research
Vol.1 (3),pp. 37-44,April 2016
ISSN 2408-7513
Available online at https://www.journalissues.org/ISR/
DOI:http://dx.doi.org/10.15739/ISR.16.004
Article 16/ID/SRJ09/ 08 pages
Author(s) agree that this article remain permanently open access under the terms of the Creative Commons Attribution License 4.0 International License.



Original Research Article

2-D Resistivity Imaging and Modeling of a dumpsite in Eneka, Rivers State, Nigeria

S.A Ugwu, H.O Nwankwoala* and  S. N Worlu

Department of Geology, University of Port Harcourt, Nigeria.

*Corresponding Author Email:nwankwoala_ho@yahoo.com



date Received: February 12, 2016     date Accepted: March 14, 2016     date Published: April 21, 2016


 Abstract

In this study, two distinctive pollutants were identified and mapped around the dumpsites in Eneka Town, Obio/Akpo Local Government Area of Rivers State, Nigeria. These are zones of anomalously high resistivity, probably gases containing methane (CH4) since they rarely dissociate in water and may have come from the biodegradation of organic wastes or petroleum wastes and leachate plumes of low resistivity containing organic substances and dissolved solids. The study areas were delineated in both the 2-D and vertical electrical sounding sections respectively as anomalously high resistive zones. These were identified and mapped in the inverse model sections as reddish to purple zones of high resistivity between 618Ωm to 1713 Ωm between the depths 1.25m to 17.3m in the entire sections. The pollutants were continuous and displaced to various degrees on each of the inverse models. The concentration levels decrease as they were displaced eastward of the dumpsite. This is confirmed by the increase in the resistivity of these compounds; 1713 Ωm in profile line1 to 1915 Ωm in profile line 3. This may be probably due to dilution effect of the gases in other fluids as it moves away from the dumpsite. A contaminant leachate plume was delineated in both the 2-D resistivity imaging and the vertical electrical sounding sections as low resistivity zones. These were identified and mapped as low resistivity between 1.25m and 17.3m in the entire inverse model sections. The least resistivity zone occurred along profile line 1, while the highest occurred in profile line 3. This suggests that the concentration levels of ions in the leachate decreases away from the waste dumpsites.


Key words: 2D Resistivity imaging, vertical electrical sounding, pollutants, contaminants, dumpsite, Eneka


Ugwu et al