Spectral induced polarization measurements on variable saturated sand-clay mixtures

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Title:Main Title: Spectral induced polarization measurements on variable saturated sand-clay mixtures
Description:Abstract: Electrical spectral induced polarization (SIP) measurements are increasingly being used in environmental studies of the saturated zone. To better understand the mechanisms causing polarization and to extend the range of SIP applications to the vadose zone, it is important to investigate how the SIP response is affected by water saturation. Therefore, sand and sand-clay mixtures were drained in several steps using a novel measurement set-up allowing SIP measurements with a high accuracy. The measured SIP spectra were interpreted by Debye decomposition, which provided a relaxation time distribution and a chargeability distribution that was converted to a normalized total chargeability. The results showed that the normalized total chargeability of the fully saturated samples increased with increasing clay content due to the larger specific surface area of the clay minerals. Furthermore, normalized total chargeability first increased and then decreased with decreasing saturation for the pure sand and the 5% sand-clay mixture. The normalized total chargeability values for the 10% and 20% sand-clay mixtures only decreased with saturation. The peak relaxation time of the sand-clay mixtures clearly decreased with decreasing saturation. Existing grain-size based mechanistic models for SIP are not able to explain the observed behaviour and the observed relationship between relaxation time and saturation suggests that model concepts relying on polarization processes in the pore space are warranted to explain the measurements on variably saturated porous media presented here.
Identifier:10.3997/1873-0604.2012048 (DOI)
Responsible Party
Creators:Katrin Breede (Author), Andreas Kemna (Author), Odilia Esser (Author), Egon Zimmermann (Author), Harry Vereecken (Author), Johan A. Huisman (Author)
Publisher:European Association of Geoscientists & Engineers
Publication Year:2013
Topic
TR32 Topic:Soil
Related Subproject:A3
Subjects:Keywords: SIP, Soil
File Details
Filename:2012_Breede_NSG.pdf
Data Type:Text - Article
Size:11 Pages
File Size:5.6 MB
Date:Issued: 01.12.2012
Mime Type:application/pdf
Language:English
Status:Completed
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Download Permission:Only Project Members
General Access and Use Conditions:For internal use only
Access Limitations:For internal use only
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:Near Surface Geophysics
Source Website:www.nsg.eage.org
Issue:6
Volume:10
Number of Pages:311 (479 - 789)
Metadata Details
Metadata Creator:Katrin Breede
Metadata Created:09.12.2013
Metadata Last Updated:09.12.2013
Subproject:A3
Funding Phase:2
Metadata Language:English
Metadata Version:V50
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