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This article in JEQ

  1. Vol. 31 No. 2, p. 487-493
     
    Received: June 6, 2001


    * Corresponding author(s): ivogeler@hort.cri.nz
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doi:10.2134/jeq2002.4870

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

  1. Markus Deurera,
  2. Iris Vogeler *a,
  3. Alexander Khrapitchevb and
  4. Dave Scottera
  1. 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

Abstract

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 × 0.15 × 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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Copyright © 2002. American Society of Agronomy, Crop Science Society of America, Soil Science SocietyPublished in J. Environ. Qual.31:487–493.