Quantitative Two-Layer Conductivity Inversion of Multi-Configuration Electromagnetic Induction Measurements
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| Title: | Main Title: Quantitative Two-Layer Conductivity Inversion of Multi-Configuration Electromagnetic Induction Measurements |
| Description: | Abstract: Electromagnetic induction (EMI) measurements return an apparent electrical conductivity that represents a weighted average of the electrical conductivity distribution over a certain depth range. Different sensing depths are obtained for different orientations, different coil off sets, and different frequencies, which, in principle, can be used for a multi -layer inversion. However, instrumental shifts, which often occur in EMI data, prevent the use of quantitative multi -layer inversion. Recently, a new calibration method was developed that uses electrical resistivity tomography (ERT) inversion results and returns quantitative apparent conductivity values. Here, we introduce an inversion scheme that uses calibrated EMI data and inverts for a two-layer earth. The inversion minimizes the misfit between the measured and modeled magnetic field by a combined global and local search and does not use any smoothing parameter. Application of this new scheme to synthetic data demonstrates its efficacy in providing the required physical property information. Inversion of calibrated experimental EMI data using horizontal coplanar (HCP) and vertical coplanar (VCP) loop configurations, coil off sets of 1 and 1.22 m, and frequencies of 8 and 15 kHz provides lateral and vertical conductivity variations very similar to those observed in an elaborate ERT experiment. The inversion is verified using synthetic EMI data calculated from ERT data. Inverting quantitative EMI data using this two-layer inversion enables the quantitative mapping of lateral and vertical electrical conductivity variations over large areas. |
| Identifier: | 10.2136/vzj2011.0035 (DOI) |
Responsible Party
| Creators: | Achim Mester (Author), Jan van der Kruk (Author), Egon Zimmermann (Author), Harry Vereecken (Author) |
| Publisher: | Soil Science Society of America |
| Publication Year: | 2013 |
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File Details
| Filename: | 2011_Mester_VZJ.pdf |
| Data Type: | Text - Article |
| Size: | 12 Pages |
| File Size: | 1.2 MB |
| Date: | Available: 04.11.2011 |
| Mime Type: | application/pdf |
| Data Format: | |
| 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: | Vadose Zone Journal |
| Source Website: | www.soils.org |
| Issue: | 4 |
| Volume: | 10 |
| Number of Pages: | 12 (1319 - 1330) |
Metadata Details
| Metadata Creator: | Jan van der Kruk |
| Metadata Created: | 02.12.2013 |
| Metadata Last Updated: | 02.12.2013 |
| Subproject: | B6 |
| Funding Phase: | 2 |
| Metadata Language: | English |
| Metadata Version: | V50 |
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| Page Visits: | 801 |
| Metadata Downloads: | 0 |
| Dataset Downloads: | 2 |
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