Capture and release zones of permeable reactive barriers under the influence of advective-dispersive transport in the aquifer

Harald Klammler, Kirk Hatfield, Mohamed M. Mohamed, Irina V. Perminova, Mike Perlmutter

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

The problem of permeable reactive barrier (PRB) capture and release behavior is investigated by means of an approximate analytical approach exploring the invariance of steady-state solutions of the advection-dispersion equation to conformal mapping. PRB configurations considered are doubly-symmetric funnel-and-gate as well as less frequent drain-and-gate systems. The effect of aquifer heterogeneity on contaminant plume spreading is hereby incorporated through an effective transverse macro-dispersion coefficient, which has to be known. Results are normalized and graphically represented in terms of a relative capture efficiency M of contaminant mass or groundwater passing a control plane (transect) at a sufficient distance up-stream of a PRB as to comply with underlying assumptions. Factors of safety FS are given as the ratios of required capture width under advective-dispersive and purely advective transport for achieving equal capture efficiency M. It is found that M also applies to the release behavior down-stream of a PRB, i.e., it describes the spreading and dilution of PRB treated groundwater possibly containing incompletely remediated contamination and/or remediation reaction products. Hypothetical examples are given to demonstrate results.

Original languageEnglish
Pages (from-to)79-94
Number of pages16
JournalAdvances in Water Resources
Volume69
DOIs
Publication statusPublished - Jul 2014

Keywords

  • Capture efficiency
  • Conformal mapping
  • Contaminant
  • Factor of safety
  • PRB
  • Plume remediation

ASJC Scopus subject areas

  • Water Science and Technology

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