This title appears in the Scientific Report :
2010
Please use the identifier:
http://dx.doi.org/10.1029/2009WR008686 in citations.
Please use the identifier: http://hdl.handle.net/2128/20630 in citations.
Determination of pore size distribution and hydraulic properties using nuclear magnetic resonance (NMR) relaxometry: a comparative study of laboratory methods (nur online)
Determination of pore size distribution and hydraulic properties using nuclear magnetic resonance (NMR) relaxometry: a comparative study of laboratory methods (nur online)
[ 1] In this study, we evaluate the feasibility of using nuclear magnetic resonance (NMR) relaxometry measurements to characterize pore size distribution and hydraulic properties in four porous samples with different texture and composition. We compare NMR with two classical techniques based on wate...
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Personal Name(s): | Stingaciu, L.-R. |
---|---|
Weihermüller, L. / Haber-Pohlmeier, S. / Stapf, S. / Vereecken, H. / Pohlmeier, A. | |
Contributing Institute: |
Agrosphäre; ICG-4 JARA - HPC; JARA-HPC JARA-ENERGY; JARA-ENERGY |
Published in: | Water resources research, 46 (2010) |
Imprint: |
Washington, DC
AGU
2010
|
DOI: |
10.1029/2009WR008686 |
Document Type: |
Journal Article |
Research Program: |
Terrestrische Umwelt |
Series Title: |
Water Resources Research
46 |
Subject (ZB): | |
Link: |
Get full text OpenAccess OpenAccess |
Publikationsportal JuSER |
Please use the identifier: http://hdl.handle.net/2128/20630 in citations.
[ 1] In this study, we evaluate the feasibility of using nuclear magnetic resonance (NMR) relaxometry measurements to characterize pore size distribution and hydraulic properties in four porous samples with different texture and composition. We compare NMR with two classical techniques based on water retention and mercury intrusion measurements. Both T-2 and T-1 NMR relaxation measurements at 6.47 MHz were carried out for three saturated model samples (medium sand, fine sand, and a homogenous sand/kaolin clay mixture) and one saturated natural silt loam soil. Cumulative pore size distribution functions and mean pore diameters were calculated assuming average surface relaxivity parameters and a cylindrical capillary model of the pores. The mean pore diameters derived from T-2 and T-1 distributions as well as the cumulative pore size distribution functions agree satisfactorily with those derived from mercury intrusion and retention curves. The observed deviations are due to limitations of each method, sample preparation, and sample composition. To evaluate the influence of the variations observed in the hydraulic properties of the samples, the pore size distribution functions were scaled back to water retention functions, and the van Genuchten hydraulic parameters were estimated by inversion using the RETC software. The comparison shows that both T-2 and T-1 NMR relaxation measurements can be used to estimate pore size distribution and mean pore diameter, as well as the retention function and corresponding hydraulic properties. |