title: Exact effective transport dynamics in a one-dimensional random environment.
abstract: We study effective transport under linear equilibrium adsorption characterized by a spatially random retardation factor. In a stochastic framework, we present a methodology to quantify explicitly the impact of spatial disorder on effective transport dynamics. We derive an exact effective transport equation, which is equivalent to transport under linear kinetic adsorption characterized by a spectrum of adsorption times. The distribution of adsorption times is given explicitly in terms of the spatial disorder distribution. Furthermore, we find that effective transport is formally equivalent to a decoupled continuous time random walk. This observation and the explicit nature of the presented results allow for a mapping of the static disorder distribution on the transition time distribution.
authors.affiliation: Department of Geotechnical Engineering and Geosciences, Technical University of Catalonia (UPC), Barcelona, Spain. marco.dentz@upc.es
authors.forename: Marco
authors.initials: M
authors.lastname: Dentz
authors.forename: Brian
authors.initials: B
authors.lastname: Berkowitz