[1665] - Quantitative imaging of spectral electrical properties of variably saturated soil columns

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Kelter, M., Huisman, J. A., Zimmermann, E., Kemna, A., Vereecken, H., 2015. Quantitative imaging of spectral electrical properties of variably saturated soil columns. Journal of Applied Geophysics, 123, 333 - 344. DOI: 10.1016/j.jappgeo.2015.09.001.
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Title(s):Main Title: Quantitative imaging of spectral electrical properties of variably saturated soil columns
Description(s):Abstract: Measurements of the effective complex electrical conductivity in the mHz to kHz frequency range using Spectral Induced Polarization (SIP) have shown promise for the characterization of soil physical and biogeochemical properties and processes. In principle, the spatial distribution of the complex electrical conductivity can be determined using Electrical Impedance Tomography (EIT). However, little is known about the accuracy of EIT imaging results, which is known to be affected by the need for a consistent treatment of variable data quality for different frequencies in the inversion process. Therefore, we aim to evaluate the ability of EIT to accurately determine the distribution of spectral electrical conductivity in the mHz to kHz frequency range. For this, we used artificially packed lysimeter columns with known structure and spectral electrical properties. EIT imaging of these columns was performed during drainage in order to investigate data quality and the accuracy of soil spectral electrical property determination for different saturation and contact impedances of the electrodes. Spectral imaging results were analyzed using a Debye-decomposition approach and compared with effective SIP measurements on independent samples of the same material. Overall, there was a good correspondence between imaged and independently measured complex electrical conductivity. Furthermore, it was found that images of peak relaxation time distribution were much less affected by spatial smoothing than images of the normalized chargeability. It was concluded that state-of-the-art data processing and inversion procedures in combination with advanced EIT equipment can be used to accurately image the spatial distribution of spectral electrical properties.
Identifier(s):DOI: 10.1016/j.jappgeo.2015.09.001
Responsible Party
Creator(s):Author: Matthias Kelter
Author: Johan A. Huisman
Author: Egon Zimmermann
Author: Andreas Kemna
Author: Harry Vereecken
TR32 Topic:Soil
Related Sub-project(s):A3
Subject(s):CRC/TR32 Keywords: EIT
File Details
File Name:Kelter2015.pdf
Data Type:Text
File Size:1771 kB (1.729 MB)
Date(s):Created: 2017-05-29
Mime Type:application/pdf
Data Format:PDF
Download Permission:OnlyTR32
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
North:-no map data
Measurement Region:Laboratory
Measurement Location:--Laboratory--
Specific Informations - Publication
Article Type:Journal
Source:Journal of Applied Geophysics
Number Of Pages:12
Page Range:333 - 344
Metadata Details
Metadata Creator:Johann Alexander (Sander) Huisman
Metadata Created:2017-05-29
Metadata Last Updated:2017-06-01
Funding Phase:2
Metadata Language:English
Metadata Version:V41
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