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Contaminated site downstream a landfill in Brazil was investigated using a 3D resistivity and induced polarization imaging technique. The choice of the investigated area was based on previous geophysical investigations and chemical analysis data from the monitoring wells that indicate the occurrence of incipient contamination. The purpose of this investigation was to detect and delineate the contamination plume produced by the wastes and to obtain detailed information about the affected area. The data set consisted of a series of parallel electrical profile data acquired with the dipole-dipole array, and was inverted as a 3D survey. This acquisition technique is less troublesome than a complete 3D survey, and still the resulting model should provide the major resistivity contrasts and enables a tridimensional picture of the main features. 2D synthetic models were constructed to evaluate the data quality and hence the 3D generated model quality. The results suggest the presence of a contamination plume and their preferential path, which is in good agreement with the underground water flow data. Chemical analysis data from the monitoring wells confirm the incipient contamination. Quasi 3D resistivity and chargeability models were constructed, with different spacing between the survey lines. These models identified the major contrasts observed in the 3D models; however they created artifacts that can mislead the interpretation. A 3D synthetic model was constructed and their inversion obtained simulating a cross-diagonal survey with pole-pole array and a parallel line survey with dipole-dipole array yielded very similar results. The 3D technique reveals to be efficient in waste disposal sites investigations, and should be taken into account when choosing the investigation technique in complex sites.

revista brasileira de geofísica

Utilização dos métodos eletroresistividade e polarização induzida com aquisição de dados 3D para caracterização geoambiental de uma área à jusante do aterro de resíduos sólidos urbanos de Bauru - SP