ASSESSMENT OF OIL/DIESEL POLLUTION USING 2D/3D ELECTRICAL RESISTIVITY AND GROUND PENETRATING RADAR AT GENERATOR HOUSE, MFM PRAYER CITY
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TextPublisher: Ibafo Geophysics 2021Edition: PROFESSOR E. A AYOLABI and MR ROTIMI AKINWALEDescription: xiii,; 100pSubject(s): GeophysicsSummary: A geophysical investigation involving the 2D/3D Electrical Resistivity Tomography andGroundPenetrating Radar methods was carried out at the generator Plant Shed house, MFMPrayer City, Lagos - Ibadan Express way, Ibafo, Ogun State, Nigeria with the aim of assessing diesel/oil
waste polluted region and to delineate the diesel/oil waste contaminant. Eight survey lines were established with the 2D electrical resistivity using Dipole-Dipolearrayand minimum electrode spacing of 0.3m to ensure high near surface resolution. Two3Delectrical resistivity cubes of 3.5 m by 6.5 m were obtained with 0.5 mminimumelectrodespacing. Similarly, 20 GPR lines with 450MHz antenna were occupied along and perpendicularto the 2D ERT traverses. From the inverted 2D Electrical Resistivity Tomography, possible oil/diesel wastearecharacterised by relatively high electrical resistivity range of 51 to 1222 Ωmand withinthedepth range of 0.2 to 2.5 m. Similarly, high resistivity anomalies (62 to 160 Ωm) are suggestiveof the polluted regions on the 3D resistivity tomograms. Meanwhile, on the Ground PenetratingRadar, the suspected oil and diesel polluted regions are characterised by amplitude suppressionpartly due to its low electrical conductivity and dielectric contrast. The mapped anomalousregions correlate with regions that are visibly polluted by oil/diesel waste. These mappedanomalies have been used to generate a depth map showing the spatial variation in depthofsuspected polluted region across the investigated area. The result of this study has shown that the diesel/oil pollution is limited to the near surfacewithin the depth of 0.2 to 2.5m. Mitigation measures can be guided by the generated depthmapof oil/diesel pollution.
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A geophysical investigation involving the 2D/3D Electrical Resistivity Tomography andGroundPenetrating Radar methods was carried out at the generator Plant Shed house, MFMPrayer City, Lagos - Ibadan Express way, Ibafo, Ogun State, Nigeria with the aim of assessing diesel/oil
waste polluted region and to delineate the diesel/oil waste contaminant. Eight survey lines were established with the 2D electrical resistivity using Dipole-Dipolearrayand minimum electrode spacing of 0.3m to ensure high near surface resolution. Two3Delectrical resistivity cubes of 3.5 m by 6.5 m were obtained with 0.5 mminimumelectrodespacing. Similarly, 20 GPR lines with 450MHz antenna were occupied along and perpendicularto the 2D ERT traverses. From the inverted 2D Electrical Resistivity Tomography, possible oil/diesel wastearecharacterised by relatively high electrical resistivity range of 51 to 1222 Ωmand withinthedepth range of 0.2 to 2.5 m. Similarly, high resistivity anomalies (62 to 160 Ωm) are suggestiveof the polluted regions on the 3D resistivity tomograms. Meanwhile, on the Ground PenetratingRadar, the suspected oil and diesel polluted regions are characterised by amplitude suppressionpartly due to its low electrical conductivity and dielectric contrast. The mapped anomalousregions correlate with regions that are visibly polluted by oil/diesel waste. These mappedanomalies have been used to generate a depth map showing the spatial variation in depthofsuspected polluted region across the investigated area. The result of this study has shown that the diesel/oil pollution is limited to the near surfacewithin the depth of 0.2 to 2.5m. Mitigation measures can be guided by the generated depthmapof oil/diesel pollution.
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