Comparisons of 2D- and 3D-inverted Resistivity Data As Well As of Resistivity- and IP-surveys on a Landfill

This extended abstract will focus on a CVES-investigation on an old abandoned landfill in Ekeboda, in the south of Sweden. The purpose of the investigation was to compare 2D and 3D inversions of resistivity data from a 2D-survey and to compare resistivity- and IP-surveys as methods for mapping landfills. To fulfil the purposes, CVES-measurements with following numeric inverse modelling of resistivity and induced polarization were conducted. The measurements were made using a modified version of the ABEM Lund Imaging System. The investigation found that the 3D inversion generally gave better resolution and detail in the models than in the 2D models. Further more, the 3D inversion seem to handle disturbances in the subsurface better than the 2D inversion does. The comparison of resistivity and IP surveys shows that, in general, the latter is better at delimiting the horisontal limits and the top of the landfill masses. The IP-survey is also able to define the covering layer in a better way. The resistivity survey, how ever, is better at distinguishing different materials.