title: Constructive Inversion of Vadose Zone GPR Observations
creator: Buchner, Jens Stefan
subject: ddc-500
subject: 500 Natural sciences and mathematics
subject: ddc-530
subject: 530 Physics
subject: ddc-550
subject: 550 Earth sciences
description: To predict the of Earth system dynamics, observations of the vadose zone structure and water content are of vital interest. A suited measurement technique is ground penetrating radar (GPR). In this dissertation, the constructive inversion of surface GPR data is introduced. It relies on a parameterized model of the subsurface structure and distribution of dielectric permittivity. With it, GPR measurements are simulated by numerically solving Maxwell’s equations. After detecting signals in the measured and simulated data, the residuals of the signals’ traveltime and amplitude is iteratively minimized to estimate the subsurface parameters. Then, water content is computed from dielectric permittivity. The method was applied to measurements obtained on a testbed, providing ground-truth data. A comparison with the estimation results showed an agreement for the structure within ±5 cm and for the water content, a difference less than 2 % vol. A further evaluation of field data demonstrated the method’s applicability, when representing structure and permittivity by spline functions. Additionally a time-series was evaluated with assuming a constant structure, which enabled to interpret water dynamics. Besides providing accurate information on water content distribution and subsurface structure, the method allows the future attempt to estimate hydraulic properties.
date: 2012-11-30
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/14171/4/Buchner_JS_Dissertation_2012.pdf
format: video/mp4
identifier: https://archiv.ub.uni-heidelberg.de/volltextserverhttps://archiv.ub.uni-heidelberg.de/volltextserver/14171/2/boundary_radiation.mp4
format: video/mp4
identifier: https://archiv.ub.uni-heidelberg.de/volltextserverhttps://archiv.ub.uni-heidelberg.de/volltextserver/14171/3/ASSESS_Geometry_3D.mp4
format: video/mp4
identifier: https://archiv.ub.uni-heidelberg.de/volltextserverhttps://archiv.ub.uni-heidelberg.de/volltextserver/14171/1/ASSESS_Geometry_Comparison.mp4
identifier: DOI:10.11588/heidok.00014171
identifier: urn:nbn:de:bsz:16-heidok-141714
identifier:   Buchner, Jens Stefan  (2012) Constructive Inversion of Vadose Zone GPR Observations.  [Dissertation]     
relation: https://archiv.ub.uni-heidelberg.de/volltextserver/14171/
rights: info:eu-repo/semantics/openAccess
rights: Please see front page of the work (Sorry, Dublin Core plugin does not recognise license id)
language: eng