title: Contribution of 3-D time-lapse ERT to the study of leachate recirculation in a landfill.
abstract: Leachate recirculation is a key process in the operation of municipal waste landfills as bioreactors. It aims at increasing the moisture content to optimise the biodegradation. Because waste is a very heterogeneous and anisotropic porous media, the geometry of the leachate plume recirculation is difficult to delineate from the surface at the scale of the bioreactor site. In this study, 3-D time-lapse electrical resistivity tomography (ERT) was used to obtain useful information for understanding leachate recirculation hydrodynamics. The ERT inversion methodology and the electrode arrays were optimised using numerical modelling simulating a 3-D leachate injection scenario. Time-lapse ERT was subsequently applied at the field scale during an experimental injection. We compared ERT images with injected volumes to evaluate the sensitivity of time-lapse ERT to delineate the plume migration. The results show that time-lapse ERT can accomplish the following: (i) accurately locate the injection plume, delineating its depth and lateral extension; (ii) be used to estimate some hydraulic properties of waste.
authors.affiliation: Laboratoire d'Etude des Transferts en Hydrologie et Environnement (LTHE, UMR 5564, CNRS, INPG, IRD, UJF), B.P. 53, 38041 Grenoble Cedex 9, France. remi.clement@hmg.inpg.fr
authors.forename: R
authors.initials: R
authors.lastname: Clément
authors.forename: L
authors.initials: L
authors.lastname: Oxarango
authors.forename: M
authors.initials: M
authors.lastname: Descloitres
mesh_terms: D003198:Computer Simulation; D005602:France; D057446:Hydrodynamics; D021621:Imaging, Three-Dimensional / Q000379:methods*; D008962:Models, Theoretical; D059008:Time-Lapse Imaging / Q000379:methods*; D014054:Tomography / Q000379:methods*; D014874:Water Pollutants, Chemical
chemical_list: D014874:Water Pollutants, Chemical