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000017434 0247_ $$2DOI$$a10.1016/j.jhydrol.2011.05.045
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000017434 041__ $$aeng
000017434 082__ $$a690
000017434 084__ $$2WoS$$aEngineering, Civil
000017434 084__ $$2WoS$$aGeosciences, Multidisciplinary
000017434 084__ $$2WoS$$aWater Resources
000017434 1001_ $$0P:(DE-HGF)0$$aSucre, O.$$b0
000017434 245__ $$aLow-field NMR logging sensor for measuring hydraulic parameters of model soils
000017434 260__ $$aAmsterdam [u.a.]$$bElsevier$$c2011
000017434 3367_ $$0PUB:(DE-HGF)16$$2PUB:(DE-HGF)$$aJournal Article
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000017434 440_0 $$03413$$aJournal of Hydrology$$v406$$x0022-1694$$y1
000017434 500__ $$3POF3_Assignment on 2016-02-29
000017434 500__ $$aFunding from the German Research Council (DFG) framed within the interdisciplinary project TRANSREGIO 32 (Interdisciplinary Collaborative Research Center, 2010) is gratefully acknowledged. The insightful comments of the referees were also of great help. OS expresses his gratitude to the German Service of Academic Exchange (DAAD) for his Ph.D. Grant and to K. Kupferschlager and M. Adams for the provided technical support.
000017434 520__ $$aKnowing the exact hydraulic parameters of soils is very important for improving water management in agriculture and for the refinement of climate models. Up to now, however, the investigation of such parameters has required applying two techniques simultaneously which is time-consuming and invasive. Thus, the objective of this current study is to present only one technique, i.e., a new non-invasive method to measure hydraulic parameters of model soils by using low-field nuclear magnetic resonance (NMR). Hereby, two model clay or sandy soils were respectively filled in a 2 m-long acetate column having an integrated PVC tube. After the soils were completely saturated with water, a low-field NMR sensor was moved up and down in the PVC tube to quantitatively measure along the whole column the initial water content of each soil sample. Thereafter, both columns were allowed to drain. Meanwhile, the NMR sensor was set at a certain depth to measure the water content of that soil slice. Once the hydraulic equilibrium was reached in each of the two columns, a final moisture profile was taken along the whole column. Three curves were subsequently generated accordingly: (1) the initial moisture profile, (2) the evolution curve of the moisture depletion at that particular depth, and (3) the final moisture profile. All three curves were then inverse analyzed using a MATLAB code over numerical data produced with the van Genuchten-Mualem model. Hereby, a set of values (alpha, n, theta(r) and theta(s)) was found for the hydraulic parameters for the soils under research. Additionally, the complete decaying NMR signal could be analyzed through Inverse Laplace Transformation and averaged on the 1/T-2 space. Through measurement of the decay in pure water, the effect on the relaxation caused by the sample could be estimated from the obtained spectra. The migration of the sample-related average < 1/T-2,T-Sample > with decreasing saturation speaks for a enhancement of the surface relaxation as the soil dries, in concordance with results found by other authors. In conclusion, this low-field mobile NMR technique has proven itself to be a fast and a non-invasive mean to investigate the hydraulic behavior of soils and to explore microscopical aspect of the water retained in them. In the future, the sensor should allow easy soil moisture measurements on-field. (C) 2011 Elsevier B.V. All rights reserved.
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000017434 65320 $$2Author$$aNuclear magnetic resonance
000017434 65320 $$2Author$$aSoils
000017434 65320 $$2Author$$aHydraulic parameters
000017434 65320 $$2Author$$aRichards equation
000017434 65320 $$2Author$$aRelaxation analysis
000017434 65320 $$2Author$$aDiffusion
000017434 650_7 $$2WoSType$$aJ
000017434 7001_ $$0P:(DE-Juel1)VDB1270$$aPohlmeier, A.$$b1$$uFZJ
000017434 7001_ $$0P:(DE-HGF)0$$aMiniére, A.$$b2
000017434 7001_ $$0P:(DE-HGF)0$$aBlümich, B.$$b3
000017434 773__ $$0PERI:(DE-600)1473173-3$$a10.1016/j.jhydrol.2011.05.045$$gVol. 406$$q406$$tJournal of hydrology$$v406$$x0022-1694$$y2011
000017434 8567_ $$uhttp://dx.doi.org/10.1016/j.jhydrol.2011.05.045
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