LNAPL Detection using ground penetrating radar

Here are reported the results obtained from the application of the georadar method for the detection ofLNAPL (Light Non-Aqueous Phase Liquids) when they are floating on the water table. In order to do this study it was necessary to fust consider the georadar response on a theoretical model, which would respond in the closest possible manner to the actual case, and then move on to the field data. The studies on the theoretical model and on the field data have shown that it is not possible to individuate the presence of light hydrocarbons floating on the water table without resorting to the evaluation of attributes. Among the numerous attributes, in this work, only the instantaneous amplitude, phase and frequency were taken into consideration. Among these attributes, the instantaneous amplitude and frequency allow detection of hydrocarbons, while the instantaneous phase gives only a better lateral continuity of reflectors.