title: Continuous-time random-walk model of transport in variably saturated heterogeneous porous media.
abstract: We propose a unified physical framework for transport in variably saturated porous media. This approach allows fluid flow and solute migration to be treated as ensemble averages of fluid and solute particles, respectively. We consider the cases of homogeneous and heterogeneous porous materials. Within a fractal mobile-immobile continuous time random-walk framework, the heterogeneity will be characterized by algebraically decaying particle retention times. We derive the corresponding (nonlinear) continuum-limit partial differential equations and we compare their solutions to Monte Carlo simulation results. The proposed methodology is fairly general and can be used to track fluid and solutes particles trajectories for a variety of initial and boundary conditions.
authors.affiliation: DEN/DM2S/SFME/LSET, CEA Saclay, Bât 454, 91191 Gif-sur-Yvette Cedex, France. andrea.zoia@cea.fr
authors.forename: Andrea
authors.initials: A
authors.lastname: Zoia
authors.forename: Marie-Christine
authors.initials: MC
authors.lastname: Néel
authors.forename: Andrea
authors.initials: A
authors.lastname: Cortis
mesh_terms: D003198:Computer Simulation; D004058:Diffusion; D008956:Models, Chemical; D015233:Models, Statistical; D016062:Porosity; D012996:Solutions / Q000737:chemistry*
chemical_list: D012996:Solutions