Abstract
The problem of one-dimensional transport of passive solute by a random steady velocity field is investigated. This problem is representative of solute movement in porous media, for example, in vertical flow through a horizontally stratified formation of variable porosity with a constant flux at the soil surface. Relating moments of particle travel time and displacement, exact expressions for the advection and dispersion coefficients in the Focker-Planck equation are compared with the perturbation results for large distances. The first- and second-order approximations for the dispersion coefficient are robust for a lognormal velocity field. The mean Lagrangian velocity is the harmonic mean of the Eulerian velocity for large distances. This is an artifact of one-dimensional flow where the continuity equation provides for a divergence free fluid flux, rather than a divergence free fluid velocity.
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Cvetkovic, V.D., Dagan, G. & Shapiro, A.M. An exact solution of solute transport by one-dimensional random velocity fields. Stochastic Hydrol Hydraul 5, 45–54 (1991). https://doi.org/10.1007/BF01544177
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DOI: https://doi.org/10.1007/BF01544177