Waterflow monitored by tracer transport in natural porous media using MRI
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| Title: | Main Title: Waterflow monitored by tracer transport in natural porous media using MRI |
| Description: | 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: | 10.2136/vzj2009.0177 (DOI) |
Responsible Party
| Creators: | Sabina Haber-Pohlmeier (Author), Michel Bechtold (Author), Siegfried Stapf (Author), Andreas Pohlmeier (Author) |
| Publisher: | Soil Science Society of America |
| Publication Year: | 2013 |
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File Details
| Filename: | 2010_Haber-Pohlmeier_VZJ.pdf |
| Data Type: | Text - Article |
| Size: | 11 Pages |
| File Size: | 2.3 MB |
| Date: | Issued: 22.10.2010 |
| Mime Type: | application/pdf |
| Data Format: | |
| Language: | English |
| Status: | Completed |
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| Download Permission: | Only Project Members |
| General Access and Use Conditions: | For internal use only |
| Access Limitations: | For internal use only |
| Licence: | [TR32DB] Data policy agreement |
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Specific Information - Publication
| Publication Status: | Published |
| Review Status: | Peer reviewed |
| Publication Type: | Article |
| Article Type: | Journal |
| Source: | Vadose Zone Journal |
| Source Website: | www.soils.org |
| Issue: | 4 |
| Volume: | 9 |
| Number of Pages: | 11 (835 - 845) |
Metadata Details
| Metadata Creator: | Markus Küppers |
| Metadata Created: | 02.12.2013 |
| Metadata Last Updated: | 02.12.2013 |
| Subproject: | A1 |
| Funding Phase: | 1 |
| Metadata Language: | English |
| Metadata Version: | V50 |
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| Page Visits: | 855 |
| Metadata Downloads: | 0 |
| Dataset Downloads: | 1 |
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