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3-D Resisitivity Survey Downstream A Landfill In Brazil – Preliminary Results
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 21st EEGS Symposium on the Application of Geophysics to Engineering and Environmental Problems, Apr 2008, cp-177-00084
Abstract
A contaminated site downstream a landfill in Brazil was investigated using a 3-D resistivity imaging technique. 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 complete 3-D survey. This acquisition technique is less troublesome than a complete 3-D survey, and despite of yielding a poorer resistivity model, the resulting model still provide the major resistivity contrasts and enables a tridimensional picture of the main features. In this work we present depth slices and individual 2-D profiles, from the models obtained by the 2-D and 3-D least-squares smoothness constrained inversion technique. The results suggest the presence of a contamination plume and their preferential path, which is in good agreement with chemical analysis and underground water flow data. The 3-D technique reveals to be efficient in waste disposal sites investigations, and should be taken into account when choosing the investigation technique to be used in complex and contaminated sites.