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000019605 0247_ $$2DOI$$a10.2136/vzj2010.0004
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000019605 041__ $$aeng
000019605 082__ $$a550
000019605 084__ $$2WoS$$aEnvironmental Sciences
000019605 084__ $$2WoS$$aSoil Science
000019605 084__ $$2WoS$$aWater Resources
000019605 1001_ $$0P:(DE-HGF)0$$aMinet, J.$$b0
000019605 245__ $$aA Generalized Frequency Domain Reflectometry Modeling Technique for Soil Electrical Properties Determination
000019605 260__ $$aMadison, Wis.$$bSSSA$$c2010
000019605 300__ $$a1063 - 1072
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000019605 440_0 $$010301$$aVadose Zone Journal$$v9$$x1539-1663$$y4
000019605 500__ $$aThis work was supported by the Belgian Science Policy Office in the frame of the Stereo II program-project SR/00/100 (HYDRASENS), the DIGISOIL project financed by the European Commission under the 7th Framework Program for Research and Technological Development, Area "Environment", Activity 6.3 "Environmental Technologies", and the Fonds de la Recherche Scientifique (FNRS, Belgium). The authors are grateful to David Robinson and two anonymous reviewers for their constructive comments.
000019605 520__ $$aWe have developed a generalized frequency domain reflectometry (FDR) technique for soil characterization that is based on an electromagnetic model decoupling the cable and probe head from the ground using frequency-dependent reflection and transmission transfer functions. The FDR model represents an exact solution of Maxwell's equations for wave propagation in one-dimensional multilayered media. The benefit of the decoupling is that the FDR probe can be fully described by its characteristic transfer functions, which are determined using only a few measurements. The soil properties are retrieved after removing the probe effects from the raw FDR data by iteratively inverting a global reflection coefficient. The proposed method was validated under laboratory conditions for measurements in water with different salt concentrations and sand with different water contents. For the salt water, inversions of the data led to dielectric permittivity and electrical conductivity values very close to the expected theoretical or measured values. In the frequency range for which the probe is efficient, a good agreement was obtained between measured, inverted and theoretically predicted signals. For the sand, results were consistent with the different water contents and also in close agreement with traditional time domain reflectometry measurements. The proposed method offers great promise for accurate soil electrical characterization because it inherently permits maximization of the information that can be retrieved from the FDR data and shows a high practicability.
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000019605 7001_ $$0P:(DE-Juel1)VDB54976$$aLambot, S.$$b1$$uFZJ
000019605 7001_ $$0P:(DE-HGF)0$$aDelaide, G.$$b2
000019605 7001_ $$0P:(DE-Juel1)129472$$aHuisman, J.A.$$b3$$uFZJ
000019605 7001_ $$0P:(DE-Juel1)129549$$aVereecken, H.$$b4$$uFZJ
000019605 7001_ $$0P:(DE-HGF)0$$aVanclooster, M.$$b5
000019605 773__ $$0PERI:(DE-600)2088189-7$$a10.2136/vzj2010.0004$$gVol. 9, p. 1063 - 1072$$p1063 - 1072$$q9<1063 - 1072$$tVadose zone journal$$v9$$x1539-1663$$y2010
000019605 8567_ $$uhttp://dx.doi.org/10.2136/vzj2010.0004
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