Modelling transverse solute mixing across a vegetation generated shear layer

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

doi:10.1080/00221686.2020.1818307

Modelling transverse solute mixing across a vegetation generated shear layer

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

University of Sheffield
University of Warwick
Heriot-Watt University

Research output: Contribution to journal › Article › peer-review

4 Citations (Scopus)

91 Downloads (Pure)

Abstract

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 language	English
Pages (from-to)	621-636
Number of pages	16
Journal	Journal of Hydraulic Research
Volume	59
Issue number	4
Early online date	7 Dec 2020
DOIs	https://doi.org/10.1080/00221686.2020.1818307
Publication status	Published - 2021

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 (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Funder

EPSRC (Grant nos. EP/K025589/1, EP/K024442/1 and EP/P012027/1). P. West was supported by an EPSRC studentship at the University of Warwick, under EP/K503204/1.

Keywords

Dispersion
finite difference model
mixing
shear effects
vegetation

ASJC Scopus subject areas

Civil and Structural Engineering
Water Science and Technology

Access to Document

10.1080/00221686.2020.1818307Licence: CC BY

PublishedFinal published version, 2.2 MBLicence: CC BY

Cite this

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title = "Modelling transverse solute mixing across a vegetation generated shear layer",

abstract = "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.",

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AU - Hart, James

AU - Stovin, Virginia

AU - Guymer, Ian

N1 - © 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 (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

PY - 2021

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N2 - 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.

AB - 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.

KW - Dispersion

KW - finite difference model

KW - mixing

KW - shear effects

KW - vegetation

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DO - 10.1080/00221686.2020.1818307

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JF - Journal of Hydraulic Research

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ER -

Modelling transverse solute mixing across a vegetation generated shear layer

Abstract

Bibliographical note

Funder

Keywords

ASJC Scopus subject areas

Access to Document

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