title: Use of electrical tomography methods to determinate the extension and main migration routes of uncontrolled landfill leachates in fractured areas.
abstract: This study focuses on the uses of the electrical tomography and its relationship with hydrochemical data in order to characterize contaminated groundwater flows in fractured aquifers. The studied area is contaminated with different hazardous substances like lyndanes, organochlorinated compounds and benzenes coming from the old non-controlled Sardas landfill. The enormous volumes of wastes filling the landfill have generated a convoluted mixture of leachates. Due to the lack of a landfill liner, the leachates have migrated through the fractured Eocene marls towards the Gallego River. The striking correlation between high concentrations of polluted groundwater and low electrical resistivity of the subsurface (<8Ω·m) allows defining the principal contaminant migration route thanks to the distribution of these conductive anomalies. This mapping verifies that there is intense tectonical-structural control of the leachate migration, because the deep migration presents the same direction as the geological axis fold.
authors.affiliation: Department of Petrology, Geochemistry and Geological Prospectio, Universitat de Barcelona, Martí i Franquès s/n, 08030 Barcelona, Spain; Department of Geology and Environmental Earth Science, Miami University, 501 East High Street, 45056 Oxford, OH, USA. Electronic address: iscaferr@gmail.com.
authors.forename: Ismael
authors.initials: I
authors.lastname: Casado
authors.affiliation: Department of Petrology, Geochemistry and Geological Prospectio, Universitat de Barcelona, Martí i Franquès s/n, 08030 Barcelona, Spain; Ecole Nationale des Sciences Appliquées d'Al Hoceima (ENSAH), University Mohammed Premier, Ajdir, Al Hoceima, Morocco.
authors.forename: Himi
authors.initials: H
authors.lastname: Mahjoub
authors.affiliation: Department of Petrology, Geochemistry and Geological Prospectio, Universitat de Barcelona, Martí i Franquès s/n, 08030 Barcelona, Spain.
authors.forename: Raul
authors.initials: R
authors.lastname: Lovera
authors.affiliation: Department of Agriculture, Ranching and Environment, Diputación General de Aragon (DGA), Plaza de San Pedro Nolasco, 7, 50071 Zaragoza, Spain. Electronic address: jfernandezc@aragon.es.
authors.forename: Jesús
authors.initials: J
authors.lastname: Fernández
authors.affiliation: Department of Petrology, Geochemistry and Geological Prospectio, Universitat de Barcelona, Martí i Franquès s/n, 08030 Barcelona, Spain.
authors.forename: Albert
authors.initials: A
authors.lastname: Casas
mesh_terms: D004784:Environmental Monitoring / Q000379:methods*; D060587:Groundwater / Q000737:chemistry*; D012037:Refuse Disposal / Q000379:methods; D014057:Tomography, X-Ray Computed; D014872:Water Movements; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D014874:Water Pollutants, Chemical
keywords: Fractured aquifer; Landfill; Polluted site (max 6); Resistivity tomography