P010 MODELLING THE EFFECTS OF SUBSURFACE HETEROGENEITY ON GROUND PENETRATING RADAR SIGNALS Introduction 1 In most GPR modelling studies stratigraphical units are modelled as homogeneous layers. However heterogeneity in the Earth’s subsurface can be a major source of variability in the observed GPR signals. GPR images are expected to vary significantly with the state for example of water or more generally of liquid saturation (Kitterød and Finsterle 2002). This was suggested in modelling studies where the occurrence of reflections in a GPR image was dependent on a heterogeneous distribution of pore water (Nguyen 1999; Kowalsky et al. 2001). It can


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