Desbarats  used a particle-tracking scheme to investigate the physics of three-dimensional solute transport in aquifers composed of two porous media of different hydraulic conductivities. The spatially heterogeneous fluid velocity was assumed to be the only mechanism of solute movement; local or pore scale dispersion and molecular diffusion were assumed to be negligible. The particle-tracking scheme used by Desbarats consisted of routing particles from node to node in a finite difference grid. In this scheme, the direction of an individual particle is randomly selected and the prob- ability associated with the particle movement in a given direction is proportional to the fluid flux in that direction. The same method was used by Moreno et al.  to investigate advective transport in a variable-aperture planar fracture.
|Title||Comment on “Macrodispersion in sand-shale sequences” by A. J. Desbarats|
|Authors||Daniel J. Goode, Allen M. Shapiro|
|Publication Subtype||Journal Article|
|Series Title||Water Resources Research|
|Record Source||USGS Publications Warehouse|
|USGS Organization||Pennsylvania Water Science Center|