![]() ![]() ![]() The radar signal penetrated deep enough and enabled the identification of a second reflector at approximately 10-m deep, interpreted as the hard basement surface which causes the strong amplitude reflection in the GPR profile. From the interpretation of the GPR and ERT profile, it was possible to locate the top and bottom of the contamination plume of the waste disposal site. The 2D electric profiles show the presence of low-resistivity (4O to 37 Ω m) anomalies that refers to the presence of accumulated hydrocarbons. An electric resistivity tomography (ERT) survey was performed on four profiles within the site to investigate the vertical and horizontal extent of the contamination plume and to define the bottom of the landfill. Enhanced reflections are associated with free and residual products in the fractured saturated zone directly above the water table. Low reflectivity zone corresponds to hydrocarbon vapor phase in the vadose zone. The complex GPR signature of the plume was well characterized. The main objective of the GPR survey was to evaluate the lateral extension of contamination. The GPR has been performed using SIR3000 unit with the 100 and 400 MHz antennas. This work presents the application of the ground-penetrating radar (GPR) method and electric resistivity tomography (ERT) technique in outlining a zone of contamination due to the light non-aqueous phase liquid (LNAPL) plume underground in the area of an impacted fuel station, close to Abha City. ![]()
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