Estimation of soil hydraulic parameters in the field by integrated hydrogeophysical inversion of time-lapse ground-penetrating radar data

Handle URI:
http://hdl.handle.net/10754/562031
Title:
Estimation of soil hydraulic parameters in the field by integrated hydrogeophysical inversion of time-lapse ground-penetrating radar data
Authors:
Jadoon, Khan; Weihermüller, Lutz; Scharnagl, Benedikt; Kowalsky, Michael B.; Bechtold, Michel; Hubbard, Susan S.; Vereecken, Harry; Lambot, Sébastien
Abstract:
An integrated hydrogeophysical inversion approach was used to remotely infer the unsaturated soil hydraulic parameters from time-lapse ground-penetrating radar (GPR) data collected at a fixed location over a bare agricultural field. The GPR model combines a full-waveform solution of Maxwell's equations for three-dimensional wave propaga- tion in planar layered media together with global reflection and transmission functions to account for the antenna and its interactions with the medium. The hydrological simu- lator HYDRUS-1D was used with a two layer single- and dual-porosity model. The radar model was coupled to the hydrodynamic model, such that the soil electrical properties (permitivity and conductivity) that serve as input to the GPR model become a function of the hydrodynamic model output (water content), thereby permiting estimation of the soil hydraulic parameters from the GPR data in an inversion loop. To monitor the soil water con- tent dynamics, time-lapse GPR and time domain reflectometry (TDR) measurements were performed, whereby only GPR data was used in the inversion. Significant effects of water dynamics were observed in the time-lapse GPR data and in particular precipitation and evaporation events were clearly visible. The dual porosity model provided betier results compared to the single porosity model for describing the soil water dynamics, which is sup- ported by field observations of macropores. Furthermore, the GPR-derived water content profiles reconstructed from the integrated hydrogeophysical inversion were in good agree- ment with TDR observations. These results suggest that the proposed method is promising for non-invasive characterization of the shallow subsurface hydraulic properties and moni- toring water dynamics at the field scale. © Soil Science Society of America.
KAUST Department:
Water Desalination and Reuse Research Center (WDRC); Water Desalination and Reuse Research Center
Publisher:
Soil Science Society of America
Journal:
Vadose Zone Journal
Issue Date:
2012
DOI:
10.2136/vzj2011.0177
Type:
Article
ISSN:
15391663
Sponsors:
This work was supported by the Forschungszentrum Julich GmbH (Germany), the Universite catholique de Louvain and Fonds National de la Recherche Scientifique (UCL and FNRS, Belgium). Khan Zaib Jadoon was funded by the CROPSENSe project funded by Bundesministerium fur Bildung und Forschung (BMBF Germany). Support for Susan Hubbard and Michael Kowalsky was provided by DOE Contract DE-AC0205CH11231 to LBNL. The authors are grateful to Marc Grasmueck, two anonymous reviewers, and the associate editor for their efforts in improving the manuscript.
Appears in Collections:
Articles; Water Desalination and Reuse Research Center (WDRC)

Full metadata record

DC FieldValue Language
dc.contributor.authorJadoon, Khanen
dc.contributor.authorWeihermüller, Lutzen
dc.contributor.authorScharnagl, Benedikten
dc.contributor.authorKowalsky, Michael B.en
dc.contributor.authorBechtold, Michelen
dc.contributor.authorHubbard, Susan S.en
dc.contributor.authorVereecken, Harryen
dc.contributor.authorLambot, Sébastienen
dc.date.accessioned2015-08-03T09:43:13Zen
dc.date.available2015-08-03T09:43:13Zen
dc.date.issued2012en
dc.identifier.issn15391663en
dc.identifier.doi10.2136/vzj2011.0177en
dc.identifier.urihttp://hdl.handle.net/10754/562031en
dc.description.abstractAn integrated hydrogeophysical inversion approach was used to remotely infer the unsaturated soil hydraulic parameters from time-lapse ground-penetrating radar (GPR) data collected at a fixed location over a bare agricultural field. The GPR model combines a full-waveform solution of Maxwell's equations for three-dimensional wave propaga- tion in planar layered media together with global reflection and transmission functions to account for the antenna and its interactions with the medium. The hydrological simu- lator HYDRUS-1D was used with a two layer single- and dual-porosity model. The radar model was coupled to the hydrodynamic model, such that the soil electrical properties (permitivity and conductivity) that serve as input to the GPR model become a function of the hydrodynamic model output (water content), thereby permiting estimation of the soil hydraulic parameters from the GPR data in an inversion loop. To monitor the soil water con- tent dynamics, time-lapse GPR and time domain reflectometry (TDR) measurements were performed, whereby only GPR data was used in the inversion. Significant effects of water dynamics were observed in the time-lapse GPR data and in particular precipitation and evaporation events were clearly visible. The dual porosity model provided betier results compared to the single porosity model for describing the soil water dynamics, which is sup- ported by field observations of macropores. Furthermore, the GPR-derived water content profiles reconstructed from the integrated hydrogeophysical inversion were in good agree- ment with TDR observations. These results suggest that the proposed method is promising for non-invasive characterization of the shallow subsurface hydraulic properties and moni- toring water dynamics at the field scale. © Soil Science Society of America.en
dc.description.sponsorshipThis work was supported by the Forschungszentrum Julich GmbH (Germany), the Universite catholique de Louvain and Fonds National de la Recherche Scientifique (UCL and FNRS, Belgium). Khan Zaib Jadoon was funded by the CROPSENSe project funded by Bundesministerium fur Bildung und Forschung (BMBF Germany). Support for Susan Hubbard and Michael Kowalsky was provided by DOE Contract DE-AC0205CH11231 to LBNL. The authors are grateful to Marc Grasmueck, two anonymous reviewers, and the associate editor for their efforts in improving the manuscript.en
dc.publisherSoil Science Society of Americaen
dc.titleEstimation of soil hydraulic parameters in the field by integrated hydrogeophysical inversion of time-lapse ground-penetrating radar dataen
dc.typeArticleen
dc.contributor.departmentWater Desalination and Reuse Research Center (WDRC)en
dc.contributor.departmentWater Desalination and Reuse Research Centeren
dc.identifier.journalVadose Zone Journalen
dc.contributor.institutionAgros-phere (IBG-3), Institute of Bio- and Geosciences, Forschungszentrum Jülich, GmbH, 52425 Jülich, Germanyen
dc.contributor.institutionTechnische Universität Braunschweig, 38106 Braunschweig, Germanyen
dc.contributor.institutionEarth Sciences Division, Lawrence Berkeley Nati onal Lab., Ber-keley, CA 94720, United Statesen
dc.contributor.institutionAgricultural Climate Research, Johann Heinrich von Thünen-Insti tut (vTI), 38116 Braunschweig, Germanyen
dc.contributor.institutionEarth and Life Institute, Université catholique de Louvain, Croix du Sud, 2 box L7.05.02, Louvain-la-Neuve B-1348, Belgiumen
kaust.authorJadoon, Khanen
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