Modelling transverse solute mixing across a vegetation generated shear layer

Patrick West, Stephen Wallis, Fred Sonnenwald, James Hart, Virginia Stovin, Ian Guymer

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Transverse solute mixing across a vegetation generated horizontal shear layer was quantified using laser induced fluorometry techniques for artificial and real vegetation. A two-dimensional finite difference model (FDM) was developed to describe transverse concentration profiles for flows containing transverse variations in velocity and transverse dispersion, from a steady solute input. The FDM was employed inversely, to optimize the parameters describing the transverse distribution of the transverse dispersion coefficient for vegetation generated shear layers. When laboratory data are available, continuous function descriptions produce slightly improved FDM modelled solute concentration profiles compared with simplified step discontinuity velocity and dispersion inputs. When laboratory data are not available, estimates of step or continuous transverse distributions from other work enable concentration profiles to be predicted with a similar goodness of fit. This paper presents a validated, simple, robust finite difference model to describe the mixing of solutes in a channel containing marginal vegetation.
Original languageEnglish
Number of pages17
JournalJournal of Hydraulic Research
Early online date7 Dec 2020
Publication statusE-pub ahead of print - 7 Dec 2020

Bibliographical note

© 2020 The Author(s). Published by Informa UK Limited, trading as Taylor & Francis Group
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


  • Dispersion
  • finite difference model
  • mixing
  • shear effects
  • vegetation

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Water Science and Technology

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