[639] - Waterflow monitored by tracer transport in natural porous media using MRI

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Haber-Pohlmeier, S., Bechtold, M., Stapf, S., Pohlmeier, A., 2010. Waterflow monitored by tracer transport in natural porous media using MRI. Vadose Zone Journal, 9 (4), 835 - 845. DOI: 10.2136/vzj2009.0177.
Title(s):Main Title: Waterflow monitored by tracer transport in natural porous media using MRI
Description(s):Abstract: Magnetic resonance imaging (MRI) is applied to the study of flow processes in a model and a natural soil core. Flow velocities in soils are mostly too slow to be monitored directly by MRI flow velocity imaging. Therefore, we used for the first time Gd-DTPA2- as a tracer in spin echo multi slice imaging protocols with strong T1-weighting for probing slow flow velocities in soils. Apart from its chemical stability, the main advantage Gd-DTPA2 is the anionic net charge in neutral aqueous solution. Here, we show that this property hinders adsorption at soil mineral surfaces and therefore retardation. Gd-DTPA was found to be a very convenient conservative tracer for the investigation of flow processes in model and natural soil cores. With respect to the flow processes in the coaxial model soil column and the natural soil column, we found totally different flow patterns. In the first case, the tracer plume moved quite homogeneously in the inner highly conductive core only and the migration into the outer fine material was very limited. A numerical simulation demonstrated that the principal features of the observed tracer motion are consistent with flow and transport theory. The natural soil core, in contrast, showed a flow pattern characterized by preferential paths avoiding dense regions and preferring loose structures. In the case of the simpler model column, the local flow velocities were also calculated by applying a peak tracking algorithm.
Identifier(s):DOI: 10.2136/vzj2009.0177
Responsible Party
Creator(s):Author: Sabina Haber-Pohlmeier
Author: Michel Bechtold
Author: Siegfried Stapf
Author: Andreas Pohlmeier
Publisher:Soil Science Society of America
TR32 Topic:Soil
Subject(s):CRC/TR32 Keywords: MRI, NMR, Numerical Simulation, Soil
File Details
File Name:2010_Haber-Pohlmeier_VZJ.pdf
Data Type:Text
Size(s):11 Pages
File Size:2353 kB (2.298 MB)
Date(s):Issued: 2010-10-22
Mime Type:application/pdf
Data Format:PDF
Download Permission:OnlyTR32
General Access and Use Conditions:For internal use only
Access Limitations:For internal use only
Licence:TR32DB Data policy agreement
North:-no map data
Measurement Region:Other
Measurement Location:--Other--
Specific Informations - Publication
Article Type:Journal
Source:Vadose Zone Journal
Number Of Pages:11
Page Range:835 - 845
Metadata Details
Metadata Creator:Markus Küppers
Metadata Created:2013-12-02
Metadata Last Updated:2013-12-02
Funding Phase:1
Metadata Language:English
Metadata Version:V40
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