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Journal of Environmental Quality 31:487-493 (2002)
© 2002 American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America

Article
SYMPOSIUM PAPERS

Imaging of Water Flow in Porous Media by Magnetic Resonance Imaging Microscopy

Markus Deurera, Iris Vogeler*,a, Alexander Khrapitchevb and Dave Scottera

a Environment and Risk Management Group, Hort Research Institute, Private Bag 11-030, Palmerston North, New Zealand
b Institute of Fundamental Sciences, Massey University, Private Bag 11-222, Palmerston North, New Zealand

* Corresponding author (ivogeler{at}hort.cri.nz)

Received for publication June 6, 2001. Magnetic resonance imaging (MRI) was used to study the flow of water in a column 14 mm in diameter packed with glass beads. 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.

Abbreviations: CDE, convection–dispersion equation • CLT, convective–lognormal transfer • MRI, magnetic resonance imaging • NMR, nuclear magnetic resonance






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Copyright © 2002 by the American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America.