The application of computational fluid dynamics to natural river channels: three-dimensional versus two-dimensional approaches

Détails

ID Serval
serval:BIB_789FAE91FC23
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
The application of computational fluid dynamics to natural river channels: three-dimensional versus two-dimensional approaches
Périodique
GEOMORPHOLOGY
Auteur(s)
Lane SN, Bradbrook KF, Richards KS, Biron PA, Roy AG
ISSN
0169-555X
Statut éditorial
Publié
Date de publication
08/1999
Volume
29
Numéro
1-2
Pages
1-20
Notes
Symposium on New Techniques in Geomorphology, GUILDFORD, ENGLAND, JAN,
1998
Résumé
This paper addresses the recent trend in fluvial geomorphology towards
using computational fluid dynamics to explore the adjustment between
Row processes, sediment transport and river channel morphology. It aims
to evaluate the extent to which three-dimensional (3D) models improve
predictive ability and prediction utility compared to two-dimensional
(2D) applications. This is achieved through comparing the predictions
of both 3D and 2D models with high-quality field data. Identical
boundary conditions, obtained from a confluence within a gravel-bed
river system with high relative roughness, are defined for each model.
Evaluation of the 3D model suggests that there is a fundamental
limitation upon model predictive ability due to problems of specifying
topographic complexity. However, comparison with the 2D model shows
that the 3D model has a higher predictive ability, particularly if the
2D model is not corrected for the effects on flow structure of
secondary circulation. Further, the 3D model provides more reliable
estimates of bed shear stress and other more useful information, such
as the three-dimensional flow field important for mixing processes.
This suggests that there is significant merit in the move towards 3D
models, but that research is required to incorporate methods developed
in other fields for dealing with boundary condition uncertainties. (C)
1999 Elsevier Science B.V. All rights reserved.
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Création de la notice
03/02/2011 14:40
Dernière modification de la notice
20/08/2019 14:35
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