TR32-Database: Database of Transregio 32

[661] - Electromagnetic induction calibration using apparent electrical conductivity modelling based on electrical resistivity tomography

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Citation
Lavoue, F., van der Kruk, J., Rings, J., Andre, F., Moghadas, D., Huisman, J. A., Lambot, S., Weihermüller, L., 2010. Electromagnetic induction calibration using apparent electrical conductivity modelling based on electrical resistivity tomography. Near Surface Geophysics, 2010 (8), 553 - 561. DOI: 10.3997/1873-0604.2010037.
Identification
Title(s):Main Title: Electromagnetic induction calibration using apparent electrical conductivity modelling based on electrical resistivity tomography
Description(s):Abstract: Electromagnetic parameters of the subsurface such as electrical conductivity are of great interest for non-destructive determination of soil properties (e.g., clay content) or hydrologic state variables (e.g., soil water content). In the past decade, several non-invasive geophysical methods have been developed to measure subsurface parameters in situ. Among these methods, electromagnetic (EM) induction appears to be the most efficient one that is able to cover large areas in a short time. However, this method currently does not provide absolute values of electrical conductivity due to calibration problems, which hinders a quantitative analysis of the measurement. In this study, we propose to calibrate EM induction measurements with electrical conductivity values measured with electrical resistivity tomography (ERT). EM induction measures an apparent electrical conductivity at the surface, which represents a weighted average of the electrical conductivity distribution over a certain depth range, whereas ERT inversion can provide absolute values for local conductivities as a function of depth. EM induction and ERT measurements were collected along a 120-metre-long transect. To reconstruct the apparent electrical conductivity measured with EM induction, the inverted ERT data were used as input in an electromagnetic forward modelling tool for magnetic dipoles over a horizontally layered medium considering the frequencies and offsets used by the EM induction instruments. Comparison of the calculated and measured apparent electrical conductivi­ties shows very similar trends but a shift in absolute values, which is attributed to system calibration problems. The observed shift can be corrected for by linear regression. This new calibration strat­egy for EM induction measurements now enables the quantitative mapping of electrical conductiv­ity values over large areas.
Identifier(s):DOI: 10.3997/1873-0604.2010037
Responsible Party
Creator(s):Author: F. Lavoue
Author: Jan van der Kruk
Author: Jörg Rings
Author: Frederic Andre
Author: Davood Moghadas
Author: Johan A. Huisman
Author: Sebastien Lambot
Author: Lutz Weihermüller
Publisher:European Association of Geoscientists & Engineers
Topic
TR32 Topic:Other
Subject(s):CRC/TR32 Keywords: EMI, ERT, GPR
File Details
File Name:2010_Lavoue_NSG.pdf
Data Type:Text
File Size:2582 kB (2.521 MB)
Date(s):Date Accepted: 2010-07-01
Mime Type:application/pdf
Data Format:PDF
Language:English
Status:Completed
Constraints
Download Permission:OnlyTR32
General Access and Use Conditions:For internal use only
Access Limitations:For internal use only
Licence:TR32DB Data policy agreement
Geographic
North:50.8811272
East:6.4676506
South:50.8594609
West:6.4333183
Measurement Region:Ellebach
Measurement Location:Selhausen
Specific Informations - Publication
Status:Published
Review:PeerReview
Year:2010
Type:Article
Article Type:Journal
Source:Near Surface Geophysics
Issue:8
Volume:2010
Number Of Pages:9
Page Range:553 - 561
Metadata Details
Metadata Creator:Jan van der Kruk
Metadata Created:2013-12-02
Metadata Last Updated:2013-12-02
Subproject:B6
Funding Phase:1
Metadata Language:English
Metadata Version:V40
Dataset Metrics
Page Visits:227
Metadata Downloads:0
Dataset Downloads:0
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