We simulate two levels of the water table (at 72 and 48 cm depth) by injecting water in a sand box that contains also some buried objects. The GPR profiles acquired with a 1200 MHz antenna on the sand box do not show any clear reflections from the top of the phreatic surface. This is because of the existence of a transition zone in which the velocity is a continuous function of depth. Examples of real and synthetic radar reflection data will be shown in order to illustrate the methodology presented here.


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