[779] - Spectral induced polarization measurements on variable saturated sand-clay mixtures

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Breede, K., Kemna, A., Esser, O., Zimmermann, E., Vereecken, H., Huisman, J. A., 2012. Spectral induced polarization measurements on variable saturated sand-clay mixtures. Near Surface Geophysics, 10 (6), 479 - 789. DOI: 10.3997/1873-0604.2012048.
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Title(s):Main Title: Spectral induced polarization measurements on variable saturated sand-clay mixtures
Description(s):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(s):DOI: 10.3997/1873-0604.2012048
Responsible Party
Creator(s):Author: Katrin Breede
Author: Andreas Kemna
Author: Odilia Esser
Author: Egon Zimmermann
Author: Harry Vereecken
Author: Johan A. Huisman
Publisher:European Association of Geoscientists & Engineers
TR32 Topic:Soil
Subject(s):CRC/TR32 Keywords: SIP, Soil
File Details
File Name:2012_Breede_NSG.pdf
Data Type:Text
Size(s):11 Pages
File Size:5691 kB (5.558 MB)
Date(s):Issued: 2012-12-01
Mime Type:application/pdf
Download Permission:OnlyTR32
General Access and Use Conditions:For internal use only
Access Limitations:For internal use only
Licence:TR32DB Data policy agreement
North:-no map data
Measurement Region:None
Measurement Location:--None--
Specific Informations - Publication
Article Type:Journal
Source:Near Surface Geophysics
Number Of Pages:11
Page Range:479 - 789
Metadata Details
Metadata Creator:Katrin Breede
Metadata Created:2013-12-09
Metadata Last Updated:2013-12-09
Funding Phase:2
Metadata Language:English
Metadata Version:V40
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