Estimation of the near surface soil water content during evaporation using air-launched ground-penetrating radar

Handle URI:
http://hdl.handle.net/10754/563256
Title:
Estimation of the near surface soil water content during evaporation using air-launched ground-penetrating radar
Authors:
Moghadas, Davood; Jadoon, Khan; Vanderborght, Jan P.; Lambot, Sébastien; Vereecken, Harry
Abstract:
Evaporation is an important process in the global water cycle and its variation affects the near sur-face soil water content, which is crucial for surface hydrology and climate modelling. Soil evaporation rate is often characterized by two distinct phases, namely, the energy limited phase (stage-I) and the soil hydraulic limited period (stage-II). In this paper, a laboratory experiment was conducted using a sand box filled with fine sand, which was subject to evaporation for a period of twenty three days. The setup was equipped with a weighting system to record automatically the weight of the sand box with a constant time-step. Furthermore, time-lapse air-launched ground penetrating radar (GPR) measurements were performed to monitor the evaporation process. The GPR model involves a full-waveform frequency-domain solution of Maxwell's equations for wave propagation in three-dimensional multilayered media. The accuracy of the full-waveform GPR forward modelling with respect to three different petrophysical models was investigated. Moreover, full-waveform inversion of the GPR data was used to estimate the quantitative information, such as near surface soil water content. The two stages of evaporation can be clearly observed in the radargram, which indicates qualitatively that enough information is contained in the GPR data. The full-waveform GPR inversion allows for accurate estimation of the near surface soil water content during extended evaporation phases, when a wide frequency range of GPR (0.8-5.0 GHz) is taken into account. In addition, the results indicate that the CRIM model may constitute a relevant alternative in solving the frequency-dependency issue for full waveform GPR modelling.
KAUST Department:
Water Desalination and Reuse Research Center (WDRC); Water Desalination and Reuse Research Center
Publisher:
EAGE Publications
Journal:
Near Surface Geophysics
Issue Date:
2014
DOI:
10.3997/1873-0604.2014017
Type:
Article
ISSN:
15694445
Sponsors:
This project was funded by the research unit: Multi-scale Interfaces in Unsaturated Soil (MUSIS) of the DFG (Deutsche Forschungsgemeinschaft). Two anonymous reviewers helped to improve the manuscript which is acknowledged.
Appears in Collections:
Articles; Water Desalination and Reuse Research Center (WDRC)

Full metadata record

DC FieldValue Language
dc.contributor.authorMoghadas, Davooden
dc.contributor.authorJadoon, Khanen
dc.contributor.authorVanderborght, Jan P.en
dc.contributor.authorLambot, Sébastienen
dc.contributor.authorVereecken, Harryen
dc.date.accessioned2015-08-03T11:44:14Zen
dc.date.available2015-08-03T11:44:14Zen
dc.date.issued2014en
dc.identifier.issn15694445en
dc.identifier.doi10.3997/1873-0604.2014017en
dc.identifier.urihttp://hdl.handle.net/10754/563256en
dc.description.abstractEvaporation is an important process in the global water cycle and its variation affects the near sur-face soil water content, which is crucial for surface hydrology and climate modelling. Soil evaporation rate is often characterized by two distinct phases, namely, the energy limited phase (stage-I) and the soil hydraulic limited period (stage-II). In this paper, a laboratory experiment was conducted using a sand box filled with fine sand, which was subject to evaporation for a period of twenty three days. The setup was equipped with a weighting system to record automatically the weight of the sand box with a constant time-step. Furthermore, time-lapse air-launched ground penetrating radar (GPR) measurements were performed to monitor the evaporation process. The GPR model involves a full-waveform frequency-domain solution of Maxwell's equations for wave propagation in three-dimensional multilayered media. The accuracy of the full-waveform GPR forward modelling with respect to three different petrophysical models was investigated. Moreover, full-waveform inversion of the GPR data was used to estimate the quantitative information, such as near surface soil water content. The two stages of evaporation can be clearly observed in the radargram, which indicates qualitatively that enough information is contained in the GPR data. The full-waveform GPR inversion allows for accurate estimation of the near surface soil water content during extended evaporation phases, when a wide frequency range of GPR (0.8-5.0 GHz) is taken into account. In addition, the results indicate that the CRIM model may constitute a relevant alternative in solving the frequency-dependency issue for full waveform GPR modelling.en
dc.description.sponsorshipThis project was funded by the research unit: Multi-scale Interfaces in Unsaturated Soil (MUSIS) of the DFG (Deutsche Forschungsgemeinschaft). Two anonymous reviewers helped to improve the manuscript which is acknowledged.en
dc.publisherEAGE Publicationsen
dc.titleEstimation of the near surface soil water content during evaporation using air-launched ground-penetrating radaren
dc.typeArticleen
dc.contributor.departmentWater Desalination and Reuse Research Center (WDRC)en
dc.contributor.departmentWater Desalination and Reuse Research Centeren
dc.identifier.journalNear Surface Geophysicsen
dc.contributor.institutionForschungszentrum Jülich GmbH, Institute of Bio- and Geosciences, Agrosphere (IBG-3)Jülich, Germanyen
dc.contributor.institutionEarth and Life Institute, Université Catholique de Louvain, Croix du Sud 2 Box, L7.05.02B-1348 Louvain-la-Neuve, Belgiumen
dc.contributor.institutionFederal Institute for Geosciences and Natural Resources (BGR), Stilleweg 2Hannover, Germanyen
kaust.authorJadoon, Khanen
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