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000021748 084__ $$2WoS$$aGeosciences, Multidisciplinary
000021748 084__ $$2WoS$$aMining & Mineral Processing
000021748 1001_ $$0P:(DE-Juel1)129561$$avan der Kruk, J.$$b0$$uFZJ
000021748 245__ $$aInversion of dispersive GPR pulse propagation in waveguides with heterogeneities and rough and dipping interfaces
000021748 260__ $$aAmsterdam [u.a.]$$bElsevier Science$$c2012
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000021748 440_0 $$014681$$aJournal of Applied Geophysics$$v81$$x0926-9851
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000021748 520__ $$aWe investigate the influence of interface roughness, heterogeneous media, and dipping layers on the inversion of dispersive GPR pulse propagation in a surface waveguide, using 3D FDTD modelling. For both broadside and endfire source-receiver configurations, we calculated responses for different interface roughnesses, heterogeneities in dielectric properties, and dipping interfaces. For increasing roughness and heterogeneity, increased backscatter energy is visible in the data. The use of multiple source-receiver offsets to calculate the phase-velocity spectrum produced a relatively good signal-to-noise ratio. For low interface roughness the medium properties could be reasonably well reconstructed. For the largest interface roughness, significant diffracted energy was present and the medium properties could not be reliably reconstructed. For models having stochastic relative permittivity variations with a Std up to 15% and correlation lengths between 0.1 and 0.5 m, the model parameters could still be relatively well reconstructed. For models with a dipping interface, the shot and countershot configuration clearly indicate lateral changes. Single-mode inversions return a wide range of medium property values, whereas combined TE-TM inversion return permittivity values that are remarkable close to the epsilon(1) and epsilon(2) values for both the shot and countershot configuration. In general, the interface roughness and heterogeneous media have a relative small influence on the inversion results. This is probably due to the use of multi-offset data for calculating the phase-velocity spectrum which is reducing the random noise. (C) 2011 Elsevier B.V. All rights reserved.
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000021748 65320 $$2Author$$aGPR
000021748 65320 $$2Author$$aWaveguide
000021748 65320 $$2Author$$aFDTD numerical modelling
000021748 65320 $$2Author$$aInterface roughness
000021748 65320 $$2Author$$aHeterogeneous media
000021748 65320 $$2Author$$aDispersion inversion
000021748 7001_ $$0P:(DE-HGF)0$$aDiamanti, N.$$b1
000021748 7001_ $$0P:(DE-HGF)0$$aGiannopoulos, A.$$b2
000021748 7001_ $$0P:(DE-Juel1)129549$$aVereecken, H.$$b3$$uFZJ
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000021748 8567_ $$uhttp://dx.doi.org/10.1016/j.jappgeo.2011.09.013
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