We compare solute transport experiments to simulations in a partially‐saturated, variable‐aperture fracture in measured fracture aperture and entrapped‐air geometry fields. The computational model tracks particles through a quasi‐three‐dimensional velocity field that is based on the two‐dimensional solution to the Reynolds equation. The model predicts 84% of the relative increase in dispersion caused by the entrapped phase, and reproduces the experimentally observed nonlinear velocity‐dependence of solute dispersion.
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Detwiler et al. (2002) studied this question.
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