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An impedance-computed tomography (ICT) algorithm and system, known as the Electroscan system, for impedance imaging with surface measurements is described. The algorithm determines the current flow paths iteratively and employs sparse-matrix techniques. The measurement system uses a grid of electrodes over the ground surface and introduces controlled currents into a subset of electrodes in a prescribed sequence. Voltage measurements (using high-impedance equipment) are taken at passive electrodes only. Tests are reported for controlled saline plumes injected into a porous media flow field in a laboratory plume, and an uncontrolled leachate plume coming from a sanitary landfill located in floodplain alluvium.
tomography, geophysics, impedance, imaging, graphics, ground water, pollution
Head, E. J. Faraci and Associates Ltd., Winnipeg, Manitoba
Hydrogeologist, Saskatchewan Water Corp., Regina, Saskatchewan
Professor of electrical engineering, University of Manitoba, Winnipeg, Manitoba