Detection of spatially limited high-porosity layers using crosshole GPR signal analysis and full-waveform inversion

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*Title:*	Main Title: Detection of spatially limited high-porosity layers using crosshole GPR signal analysis and full-waveform inversion
*Description:*	Abstract: High-permittivity layers, related to high-porosity layers or impermeable clay lenses, can act as low-velocity electromagnetic waveguides. Electromagnetic wave phenomena associated with these features are complicated, not well known and not easy to interpret in borehole GPR data. Recently, a novel amplitude analysis approach was developed that is able to detect continuous low-velocity waveguides and their boundaries between boreholes by using maximum and minimum positions of the trace energy profiles in measured GPR data. By analyzing waveguide models of different thickness, dip, extent, permittivity, and conductivity parameters, we extend the amplitude analysis to detect spatially limited or terminated waveguides. Waveguides that show high-amplitude elongated wave trains are most probably caused by a change in porosity rather than a change in clay content. In a crosshole GPR data set from the Boise Hydrogeophysical Research Site, two terminated wave-guiding structures were detected using the extended amplitude analysis. Information gained from the amplitude analysis improved the starting model for fullwaveform inversion which imaged the lateral extent and thickness of terminated waveguides with high resolution. Synthetic data calculated using the inverted permittivity and conductivity models show similar amplitudes and phases, as observed in the measured data, which indicates the reliability of the obtained models. Neutron-Neutron logging data from three boreholes confirm the changes in porosity and indicate that these layers were high-porosity sand units within low-porosity, poorly sorted sand, and gravel units.
*Identifier:*	10.1002/2013WR015177 (DOI)
*Citation Advice:*	Klotzsche, A., J. van der Kruk, J. Bradford, and H. Vereecken (2014), Detection of spatially limited highporosity layers using crosshole GPR signal analysis and full-waveform inversion, Water Resour. Res., 50, doi:10.1002/2013WR015177.

Responsible Party

*Creators:*	Anja Klotzsche (Author), Jan van der Kruk (Author), John Bradford (Author), Harry Vereecken (Author)
*Contributor:*	Jan van der Kruk (Supervisor)
*Publisher:*	AGU Publications
*Publication Year:*	2014

Topic

*TR32 Topic:*	Soil
*Related Subproject:*	B6
*Subject:*	Keyword: Soil Texture

File Details

*Filename:*	Klotzsche-etal.2014.pdf
*Data Type:*	Text - Article
*File Size:*	5.2 MB
*Date:*	Available: 15.07.2014
*Mime Type:*	application/pdf
*Language:*	English
*Status:*	Completed

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*Download Permission:*	Only Project Members
*General Access and Use Conditions:*	According to the TR32DB data policy agreement.
*Access Limitations:*	According to the TR32DB data policy agreement.
*Licence:*	[TR32DB] Data policy agreement

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Specific Information - Publication

*Publication Status:*	Published
*Review Status:*	Peer reviewed
*Publication Type:*	Article
*Article Type:*	Journal
*Source:*	Water Resources Research
*Volume:*	50
*Number of Pages:*	10 (11 - 20)

Metadata Details

*Metadata Creator:*	Christian von Hebel
*Metadata Created:*	18.09.2014
*Metadata Last Updated:*	18.09.2014
*Subproject:*	B6
*Funding Phase:*	2
*Metadata Language:*	English
*Metadata Version:*	V50

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