Three-dimensional inversion of induced polarization data from simulated waste |
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| Institution: | 1. 360;2. School of Environmental Sciences, University of Guelph, 50 Stone Road E, Guelph, ON N1G 2W1, Canada;1. Computational Mechanics and Numerical Mathematics, University of Groningen, Nijenborgh 9, Groningen 9747AG, the Netherlands;2. Mechanical Engineering, Eindhoven University of Technology, P.O. Box 513, Eindhoven 5600MB, the Netherlands;3. Multiscale Modeling and Simulation, Faculty EEMCS, University of Twente, P.O. Box 217, Enschede 7500AE, the Netherlands;4. Multiscale Physics of Energy Systems, Faculty of Applied Physics, Center for Computational Energy Research, the Netherlands |
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| Abstract: | The Idaho National Laboratory (INEL) Cold Test Pit (CTP) has been carefully constructed to simulate buried hazardous waste sites. An induced polarization (IP) survey of the CTP shows a very strong polarization and a modest resistivity response associated with the simulated waste. A three-dimensional (3-D) inversion algorithm based on the simultaneous iterative reconstruction technique (SIRT) and finite difference forward modelling has been applied to generate a subsurface model of complex resistivity. The lateral extents of the waste zone are well resolved. Limited depth extent is recognized, but the bottom of the waste appears too deep. With a modelling experiment, the intrinsic polarizability of the waste material is determined. Since IP is a technique for detection of diffuse occurrences of metallic material, this method holds promise as a method to distinguish buried waste from conductive soil material. |
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