title: Ground Penetrating Radar as a Quantitative Tool with Applications in Soil Hydrology
creator: Gerhards, Holger
subject: ddc-530
subject: 530 Physics
description: This work concentrates on the investigation of ground penetrating radar (GPR) with respect to applications in soil hydrology. The motivation is to expand the boundaries of processability and evaluability of GPR measurements. Therefore, a detailed review of the fundamentals for electromagnetic wave propagation is given. First, theoretical and experimental descriptions of the dielectric material models are introduced. This is followed by an overview of different modeling approaches in electrodynamics which differ in their physical complexity. The ray approach, a plane wave description and a Green’s function approach are presented, where the last simulates a vertical dipole in a horizontally layered medium. With the help of these modeling approaches, some specific electromagnetic wave phenomena are studied. For instance the reflection and the refraction at continuously varying dielectric properties are analyzed, which can stem for example from the water distribution in soils. Furthermore, the ground wave is studied regarding its evanescent wave behavior. This can be observed, when the wave couples into the air. As an outcome of the theoretical considerations, two novel measurement techniques and their evaluation approaches are presented. One technique is the lift measurement, which enables the detection of evanescent waves. The other technique is the multi-channel method, which allows a simultaneous access to reflector depth and average water content up to several hundred meters.
date: 2008
type: Dissertation
type: info:eu-repo/semantics/doctoralThesis
type: NonPeerReviewed
format: application/pdf
identifier: https://archiv.ub.uni-heidelberg.de/volltextserverhttps://archiv.ub.uni-heidelberg.de/volltextserver/8777/1/thesis.pdf
identifier: DOI:10.11588/heidok.00008777
identifier: urn:nbn:de:bsz:16-opus-87775
identifier:   Gerhards, Holger  (2008) Ground Penetrating Radar as a Quantitative Tool with Applications in Soil Hydrology.  [Dissertation]     
relation: https://archiv.ub.uni-heidelberg.de/volltextserver/8777/
rights: info:eu-repo/semantics/openAccess
rights: http://archiv.ub.uni-heidelberg.de/volltextserver/help/license_urhg.html
language: eng