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000017744 0247_ $$2DOI$$a10.2136/vzj2011.0035
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000017744 041__ $$aeng
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000017744 084__ $$2WoS$$aEnvironmental Sciences
000017744 084__ $$2WoS$$aSoil Science
000017744 084__ $$2WoS$$aWater Resources
000017744 1001_ $$0P:(DE-Juel1)140421$$aMester, A.$$b0$$uFZJ
000017744 245__ $$aQuantitative Two-Layer Conductivity Inversion of Multi-Configuration Electromagnetic Induction Measurements
000017744 260__ $$aMadison, Wis.$$bSSSA$$c2011
000017744 300__ $$a1319 - 1330
000017744 3367_ $$0PUB:(DE-HGF)16$$2PUB:(DE-HGF)$$aJournal Article
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000017744 440_0 $$010301$$aVadose Zone Journal$$v10$$x1539-1663$$y4
000017744 500__ $$aWe thank the reviewer F. A. Monteiro Santos and two unknown reviewers, the associate editor A. Revil, and co-editor S. Hubbard for their help in improving the manuscript. We acknowledge the support by the SFB/TR 32 'Pattern in Soil-Vegetation-Atmosphere Systems: Monitoring, Modelling and Data Assimilation' funded by the Deutsche Forschungsgemeinschaft (DFG) and 'TERrestrial ENvironmental Observatories' (TERENO).
000017744 520__ $$aElectromagnetic 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.
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000017744 7001_ $$0P:(DE-Juel1)129561$$avan der Kruk, J.$$b1$$uFZJ
000017744 7001_ $$0P:(DE-Juel1)133962$$aZimmermann, E.$$b2$$uFZJ
000017744 7001_ $$0P:(DE-Juel1)129549$$aVereecken, H.$$b3$$uFZJ
000017744 773__ $$0PERI:(DE-600)2088189-7$$a10.2136/vzj2011.0035$$gVol. 10, p. 1319 - 1330$$p1319 - 1330$$q10<1319 - 1330$$tVadose zone journal$$v10$$x1539-1663$$y2011
000017744 8567_ $$uhttp://dx.doi.org/10.2136/vzj2011.0035
000017744 909CO $$ooai:juser.fz-juelich.de:17744$$pVDB:Earth_Environment$$pVDB
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000017744 9141_ $$y2011
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000017744 9201_ $$0I:(DE-Juel1)ZEL-20090406$$gZEL$$kZEL$$lZentralinstitut für Elektronik$$x1
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