Journal
ADVANCES IN WATER RESOURCES
Volume 49, Issue -, Pages 13-22Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.advwatres.2012.07.015
Keywords
Diffusion in random media; Continuous time random walks; Time-domain random walks; Multirate mass transfer; Stochastic modeling
Categories
Funding
- European Union [UE-7thFP-ENERGY 227286]
- French National Research Agency [ANR-08-PCO2-004-01]
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We study diffusion in a heterogeneous medium that is characterized by spatially varying diffusion properties from a random walk point of view. We show that an inhomogeneous continuous time random walk (CTRW) with a spatially variable exponential transition time distribution solves the spatially discretized heterogeneous diffusion equation. This demonstrates the equivalence of the widely used time-domain random walk (TDRW) scheme and spatially inhomogeneous CTRW and at the same time provides a demonstration of the formal equivalence of the TDRW particle formulation and the heterogeneous diffusion equation. Based on this equivalence, we develop a TDRW method for heterogeneous diffusion under spatially variable multirate mass transfer properties. We discuss the implementation of these schemes and study the diffusion behavior in the presence of traps that are characterized by a truncated power-law trapping time distribution. (C) 2012 Elsevier Ltd. All rights reserved.
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