Marjoribanks_et_al-2017-Earth_Surface_Processes_and_Landforms.pdf (1.31 MB)
0/0

Patch-scale representation of vegetation within hydraulic models

Download (1.31 MB)
journal contribution
posted on 08.09.2016 by Tim Marjoribanks, Richard J. Hardy, Stuart N. Lane, Matthew J. Tancock
Submerged aquatic vegetation affects flow, sediment and ecological processes within rivers. Quantifying these effects is key to effective river management. Despite a wealth of research into vegetated flows, the detailed flow characteristics around real plants in natural channels are still poorly understood. Here we present a new methodology for representing vegetation patches within computational fluid dynamics (CFD) models of vegetated channels. Vegetation is represented using a Mass Flux Scaling Algorithm (MFSA) and drag term within the Reynolds-Averaged Navier-Stokes Equations, which account for the mass and momentum effects of the vegetation respectively. The model is applied using three different grid resolutions (0.2, 0.1 & 0.05 m) using time-averaged solution methods and compared to field data. The results show that the model reproduces the complex spatial flow heterogeneity within the channel and that increasing the resolution leads to enhanced model accuracy. Future applications of the model to the prediction of channel roughness, sedimentation and key eco-hydraulic variables are presented, likely to be valuable for informing effective river management.

Funding

The work was funded under a NERC PhD studentship and NERC grant NE/K003194/1.

History

School

  • Architecture, Building and Civil Engineering

Published in

Earth Surface Processes and Landforms

Citation

MARJORIBANKS, T.I. ... et al, 2016. Patch-scale representation of vegetation within hydraulic models. Earth Surface Processes and Landforms, 42 (5), pp. 699–710.

Publisher

Wiley © The Authors

Version

VoR (Version of Record)

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution 4.0 International (CC BY 4.0) licence. Full details of this licence are available at: http://creativecommons.org/licenses/by/4.0/

Publication date

2016-08-02

Notes

This is an Open Access Article. It is published by Wiley under the Creative Commons Attribution 4.0 International Licence (CC BY). Full details of this licence are available at: http://creativecommons.org/licenses/by/4.0/

ISSN

0197-9337

Language

en

Licence

Exports

Logo branding

Keyword(s)

Licence

Exports