| Imaging of water flow in porous media by magnetic resonance imaging microscopy. | |
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MedLine Citation:
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PMID: 11931438 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Magnetic resonance imaging (MRI) was used to study the flow of water in a column 14 mm in diameter packed with glass heads. The sample was fully saturated and water was pumped through the column using a peristaltic pump, at flow rates of 125 and 250 mL h(-1). This corresponds to mean velocities of 0.5 and 1 mm s(-1), given a porosity of 0.46 m3 m(-3). Nuclear magnetic resonance (NMR) images of the proton density and velocities within a 2-mm slice were taken at a spatial resolution of 0.15 x 0.15 x 2 mm3. At a mean pore water velocity of 1 mm s(-1) we approximated hydrodynamic dispersion using NMR-measured velocity distributions in a 2-mm slice through the sample. Additionally, we conducted a step pulse tracer experiment with chloride through the same column and at identical initial and boundary conditions. We fitted the convection-dispersion equation to the breakthrough curve and compared the column scale dispersion of the tracer experiment with the respective NMR estimate derived at the slice scale. |
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Authors:
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Markus Deurer; Iris Vogeler; Alexander Khrapitchev; Dave Scotter |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Journal of environmental quality Volume: 31 ISSN: 0047-2425 ISO Abbreviation: J. Environ. Qual. Publication Date: 2002 Mar-Apr |
Date Detail:
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Created Date: 2002-04-04 Completed Date: 2002-09-10 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 0330666 Medline TA: J Environ Qual Country: United States |
Other Details:
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Languages: eng Pagination: 487-93 Citation Subset: IM |
Affiliation:
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Environment and Risk Management Group, Hort Research Institute, Palmerston North, New Zealand. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Environmental Monitoring Glass Magnetic Resonance Spectroscopy / methods* Models, Theoretical Porosity Soil* Water Movements* |
| Chemical | |
Reg. No./Substance:
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0/Soil |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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