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000186381 0247_ $$2ISSN$$a1879-2707
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000186381 1001_ $$0P:(DE-HGF)0$$aLaloy, Eric$$b0$$eCorresponding Author
000186381 245__ $$aHigh-resolution moisture profiles from full-waveform probabilistic inversion of TDR signals
000186381 260__ $$aAmsterdam [u.a.]$$bElsevier$$c2014
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000186381 520__ $$aThis study presents an novel Bayesian inversion scheme for high-dimensional undetermined TDR waveform inversion. The methodology quantifies uncertainty in the moisture content distribution, using a Gaussian Markov random field (GMRF) prior as regularization operator. A spatial resolution of 1 cm along a 70-cm long TDR probe is considered for the inferred moisture content. Numerical testing shows that the proposed inversion approach works very well in case of a perfect model and Gaussian measurement errors. Real-world application results are generally satisfying. For a series of TDR measurements made during imbibition and evaporation from a laboratory soil column, the average root-mean-square error (RMSE) between maximum a posteriori (MAP) moisture distribution and reference TDR measurements is 0.04 cm3 cm-3. This RMSE value reduces to less than 0.02 cm3 cm-3 for a field application in a podzol soil. The observed model-data discrepancies are primarily due to model inadequacy, such as our simplified modeling of the bulk soil electrical conductivity profile. Among the important issues that should be addressed in future work are the explicit inference of the soil electrical conductivity profile along with the other sampled variables, the modeling of the temperature-dependence of the coaxial cable properties and the definition of an appropriate statistical model of the residual errors.
000186381 536__ $$0G:(DE-HGF)POF2-246$$a246 - Modelling and Monitoring Terrestrial Systems: Methods and Technologies (POF2-246)$$cPOF2-246$$fPOF II$$x0
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000186381 7001_ $$0P:(DE-Juel1)129472$$aHuisman, Johan Alexander$$b1$$ufzj
000186381 7001_ $$0P:(DE-HGF)0$$aJacques, Diederik$$b2
000186381 773__ $$0PERI:(DE-600)1473173-3$$a10.1016/j.jhydrol.2014.10.005$$gVol. 519, p. 2121 - 2135$$nPart B$$p2121 - 2135$$tJournal of hydrology$$v519$$x0022-1694$$y2014
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