HR: 08:15h
AN: H41H-02    [Abstracts]
TI: Hydrogeophysical inversion of time-lapse proximal ground-penetrating radar data for shallow subsurface hydraulic characterization
AU: * Lambot, S
EM: sebastien.lambot@uclouvain.be
AF: Universite catholique de Louvain, Croix du Sud, 2 box 2, Louvain-la-Neuve, 1348, Belgium
AU: Jadoon, K Z
EM: k.z.jadoon@fz-juelich.de
AF: Forschungszentrum Juelich GmbH, Forschungszentrum Juelich GmbH, Juelich, D-52425, Germany
AU: Slob, E C
EM: E.C.Slob@tudelft.nl
AF: Delft University of Technology, Stevinweg 1, Delft, 2628 CN, Netherlands
AU: Vereecken, H
EM: h.vereecken@fz-juelich.de
AF: Forschungszentrum Juelich GmbH, Forschungszentrum Juelich GmbH, Juelich, D-52425, Germany
AB: Sustainable and optimal agricultural and environmental management of water and land resources particularly relies on the description and understanding of soil water distribution and dynamics at the field scale. We present a non-invasive method for estimating the unsaturated soil hydraulic properties and continuous vertical water content profiles from time-lapse proximal GPR based on integrated electromagnetic and hydrodynamic inversion. The radar system is based on international standard vector network analyzer technology and a full-wave model is used to describe wave propagation in the antenna-air-soil system, including antenna-soil interactions. Hydrodynamic modeling is based on a one-dimensional solution of Richard's equation with Mualem-van Genuchten parameterization. The uniqueness of the inverse solution is analyzed using numerical experiments for different textured soils and infiltration events. The stability of the inverse solution with respect to errors in fixed key hydraulic and petrophysical parameters is quantified. Finally, the approach is tested in controlled laboratory conditions for an variable infiltration event in a homogeneous sandy soil. The proposed approach appears to be promising for characterizing the shallow subsurface hydraulic properties at the field scale with a high spatial resolution.
DE: 0629 Inverse scattering
DE: 1835 Hydrogeophysics
DE: 1838 Infiltration
DE: 1894 Instruments and techniques: modeling
DE: 1895 Instruments and techniques: monitoring
SC: Hydrology [H]
MN: 2007 Fall Meeting