Emergence of anomalous transport in stressed rough fractures

Peter K. Kang, Stephen Brown, Ruben Juanes

Research output: Contribution to journalArticle

47 Scopus citations

Abstract

We report the emergence of anomalous (non-Fickian) transport through a rough-walled fracture as a result of increasing normal stress on the fracture. We show that the origin of this anomalous transport behavior can be traced to the emergence of a heterogeneous flow field dominated by preferential channels and stagnation zones, as a result of the larger number of contacts in a highly stressed fracture. We show that the velocity distribution determines the late-time scaling of particle spreading, and velocity correlation determines the magnitude of spreading and the transition time from the initial ballistic regime to the asymptotic anomalous behavior. We also propose a spatial Markov model that reproduces the transport behavior at the scale of the entire fracture with only three physical parameters. Our results point to a heretofore unrecognized link between geomechanics and particle transport in fractured media.

Original languageEnglish (US)
Pages (from-to)46-54
Number of pages9
JournalEarth and Planetary Science Letters
Volume454
DOIs
StatePublished - Nov 15 2016
Externally publishedYes

Keywords

  • anomalous transport
  • fracture
  • groundwater flow
  • roughness
  • spatial Markov model

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