Journal Article

PreJuSER-22332

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Electromagnetic induction antenna modelling using a linear system of complex antenna transfer functions

Moghadas, D.FZJ* ; Andre, F.FZJ* ; Bradford, J. H. ; van der Kruk, J.FZJ* ; Vereecken, H.FZJ* ; Lambot, S.FZJ*

2012
EAGE Houten

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Please use a persistent id in citations: doi:10.3997/1873-0604.2012002

Abstract: The quantitative retrieval of soil apparent electrical conductivity using electromagnetic induction (EMI) has remained limited due to strong simplifications regarding EMI antenna modelling. In this paper, a new technique for EMI antenna modelling is applied for the common-offset EMI systems. The EMI system is efficiently described using global transmission and reflection coefficients and Green's functions are used to describe wave diffusion for horizontal and vertical dipole modes. We performed EMI measurements along a 180-metre-long transect with two different instrument heights above the soil surface, as well as with different orientations and frequencies. To ensure proper retrieval of the soil apparent electrical conductivity, the reference values were obtained from electrical conductivity data measured from 11 undisturbed soil cores taken along the EMI transect. The apparent electrical conductivity values calculated by applying the proposed model have a good agreement with reference values, however some discrepancies can be observed that are mainly attributed to the presence of local heterogeneities and also errors due to the variations in the height of the EMI instruments above the ground. The proposed method appears to be promising for quantitative retrieval of soil apparent electrical conductivity and resolving calibration issues that are typically encountered using EMI. In addition, the model calibration (antenna transfer functions determination) was successfully accomplished using conductivity values measured from the soil cores.

Keyword(s): J

Note: This research was supported by the Forschungszentrum Julich (FZJ, Germany), Universite catholique de Louvain (UCL, Belgium), Fonds National de la Recherche Scientifique (FNRS, Belgium) and Boise State University (BSU, USA) in the framework of the DIGISOIL project, financed by the European Commission under the 7th Framework Programme for Research and Technological Development, Area "Environment", Activity 6.3 "Environmental Technologies". Davood Moghadas is currently supported by the MUSIS project funded by Deutsche Forschungsgemeinschaft (DFG, Germany).

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Contributing Institute(s):

1. Agrosphäre (IBG-3)

Research Program(s):

1. Terrestrische Umwelt (P24)

Appears in the scientific report 2012

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Database coverage:
Current Contents - Social and Behavioral Sciences ; JCR ; SCOPUS ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection

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