Parts | Days | Selection | Search | Downloads | Help

UP: Umweltphysik

UP 2: Transportprozesse im Boden

UP 2.1: Invited Talk

Tuesday, March 19, 2002, 10:15–10:45, HS 11

Non-invasive methods to quantify solute transport in soils and aquifers — •Harry Vereecken and Andreas Kemna — Forschungszentrum Juelich GmbH, 52425 Juelich

Non-invasive methods such as geophysical and tomographic techniques are increasingly used to study water flow and transport processes in soils and aquifers. The main objective here is to obtain space- and time-continuous information on parameters and variables determining the transport of solutes. We will present an overview of different imaging techniques presently used to study solute transport in porous media. Special attention will be given to the use of magnetic resonance imaging, MRI, and electrical resistivity tomography, ERT, to derive local-scale dispersivity from tracer experiments. Herrmann et al. applied MRI to estimate local-scale dispersivity in packed glass beads colomns. Recently, Kemna et al. used ERT to monitor solute concentration changes on a reference plane during a field tracer test. Both the longitudinal and lateral spreading of the solute plume was quantified in terms of equivalent dispersivities of a 3D equivalent convection-dispersion model. In addition, we will propose a new magneto-electrical resistivity imaging technique, MERIT, based on the joint measurement and inversion of electric potential and magnetic field data, to derive the spatial distribution of bulk electrical conductivity and solute concentration.