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. The 3D inverse resistivity models indicate that the contaminated zone at the site has relatively high resistivity values. The inversion of the datasets generated resistivity models and isosurfaces showing the distribution of electrical resistivity values. The ERI datasets were inverted using the Res3Dinv and in ERTLab TM 3D inversion and modeling software packages. 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 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. This study was aimed at evaluating the utility of electrical resistivity imaging (ERI) method in investigating and monitoring sites contaminated by spillage of oils.
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