Record setting during dispersive transport in porous media

Yaniv Edery, Alex Kostinski, Brian Berkowitz

Research output: Contribution to journalArticlepeer-review

Abstract

How often does a contaminant particle migrating in a porous medium set a distance record, i.e., advance farther from the origin than at all previous time steps? This question is of fundamental importance in characterizing the nature of the leading edge of a contaminant plume as it is transported through an aquifer. It was proven theoretically by Majumdar and Ziff (2008) that, in the 1d case for pure diffusion, record setting of a random walker scales with n 1/2, where n is the number of steps, regardless of the length and time distribution of steps. Here, we use numerical simulations, benchmarked against the 1d analytical solution, to extend this result also for pure diffusion in 2d and 3d domains. We then consider transport in the presence of a drift (i.e., advective-dispersive transport), and show that the record-setting pace of random walkers changes abruptly from ∞ n1/2 to ∞ n1. We explore the dependence of the prefactor on the distribution of step length and number of spatial dimensions. The key implication is that when, after a brief transitional period, the scaling regime commences, the maximum distance reached by the leading edge of a migrating contaminant plume scales linearly with n, regardless of the drift magnitude.

Original languageEnglish
Article numberL16403
Number of pages5
JournalGeophysical Research Letters
Volume38
Issue number16
DOIs
StatePublished - 1 Aug 2011

All Science Journal Classification (ASJC) codes

  • Geophysics
  • General Earth and Planetary Sciences

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