Abstract:

In this study, the effect of the physical parameters directly affecting the performance of the ground radar (GPR) method on the field was investigated by using a three-dimensional numerical model. While the medium was designed as saturated sand, the properties of dense non-aqueous phase liquids (DNAPL) were used as buried mass. Trichloroethylene (TCE), Tetrachlorethylene (PCE), Trichloroethane, and Dichloroethane were selected as DNAPL types. 1.5GHz center frequency GSSI brand GPR antenna was used as a source. In the first stage, while the physical parameters of the medium were gradually increased, the physical parameters of the DNAPL mass were kept constant. In the second stage, the opposite process was applied. When the radargrams were examined, it was observed that the reflections of the DNAPL mass were delayed due to the increase of the relative dielectric permittivity of the medium. In addition, TCE was the most detectable DNAPL type that causes the most obvious reflections. When the electrical conductivity value was increased gradually, electromagnetic energy was absorbed and recorded as weak reflections. It was observed that the gradual increase of the relative magnetic permeability value caused strong multiple reflections.

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