Application of three dimensional (3d) electrical resistivity imaging (eri) technique in a study conducted on oil contaminated experimental site in biust, palapye, botswana.

Bokani Nthaba, Elisha M. Shemang, Oathusa Gareutlwane, Loago Molwalefhe

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

This study was aimed at evaluating the utility of electrical resistivity imaging (ERI) method in investigating and monitoring sites contaminated by spillage of oils. The geophysical investigation involved acquiring electrical resistivity data along eight (8) parallel profiles of 7.99 m length, using a dipole-dipole electrode configuration with a separation of 0.5 m between profiles and 0.17 m between electrodes. The initial ERI measurements were acquired before the oil contamination and the subsequent four datasets were acquired after the site was contaminated with engine oil, on a two weeks interval basis. The ERI datasets were inverted using the Res3Dinv and in ERTLabTM 3D inversion and modeling software packages. The inversion of the datasets generated resistivity models and isosurfaces showing the distribution of electrical resistivity values. The 3D inverse resistivity models indicate that the contaminated zone at the site has relatively high resistivity values. The isosurface images indicate that the oil contamination is restricted to a depth range of 0.1 m to 0.8 m for the second dataset and to a depth range of 0.1 m to 0.4 m at the end of the experiment. This pattern was also evident in the horizontal sections from layer 2 (depth: 0.06-0.13 m) to layer 9 (depth: 0.82-1.00 m) in the second dataset models and from layer 3 (depth: 0.13-0.21 m) to layer 6 (depth: 0.40-0.52 m) at the end of the experiment. Both images reveal low resistivity clay dominated soils at the surface, in regions flanking the oil contaminated zone, and beneath the oil contaminated soil material.

Original languageEnglish
Title of host publication32nd Symposium on the Application of Geophysics to Engineering and Environmental Problems, SAGEEP 2019
PublisherJ and N Group, Ltd.
Pages11-15
Number of pages5
ISBN (Electronic)9781510883949
DOIs
Publication statusPublished - 2019
Event32nd Symposium on the Application of Geophysics to Engineering and Environmental Problems, SAGEEP 2019 - Portland, United States
Duration: Mar 17 2019Mar 21 2019

Publication series

NameProceedings of the Symposium on the Application of Geophyics to Engineering and Environmental Problems, SAGEEP
Volume2019-March
ISSN (Electronic)1554-8015

Conference

Conference32nd Symposium on the Application of Geophysics to Engineering and Environmental Problems, SAGEEP 2019
CountryUnited States
CityPortland
Period3/17/193/21/19

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Geotechnical Engineering and Engineering Geology
  • Environmental Engineering

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  • Cite this

    Nthaba, B., Shemang, E. M., Gareutlwane, O., & Molwalefhe, L. (2019). Application of three dimensional (3d) electrical resistivity imaging (eri) technique in a study conducted on oil contaminated experimental site in biust, palapye, botswana. In 32nd Symposium on the Application of Geophysics to Engineering and Environmental Problems, SAGEEP 2019 (pp. 11-15). (Proceedings of the Symposium on the Application of Geophyics to Engineering and Environmental Problems, SAGEEP; Vol. 2019-March). J and N Group, Ltd.. https://doi.org/10.4133/sageep.32-006