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Emergence of coherent flow structures over a gravel surface : a numerical experiment.

Hardy, R. J. and Lane, S. N. and Ferguson, R. I. and Parsons, D. R. (2007) 'Emergence of coherent flow structures over a gravel surface : a numerical experiment.', Water resources research., 43 . W03422.

Abstract

Gravel bed rivers have complex, porous, and irregular surfaces, characterized by a range of morphological forms. These topographical structures determine the flow structures that develop over the river bed, primarily by the shedding of vortices in the downstream wake of protruding clasts. Previous research into these flow structures has come from experimental studies, which have used either flow visualization or single-point measurements techniques. Here we present a numerical experiment where large-eddy simulation (LES) is used to study the generation, evolution, and destruction of these flow structures over a naturally water worked gravel surface. The numerical simulations reported in this paper show that there are two distinct scales of boundary influence upon the shallow flow and emphasize that the measured flow variability at any one point in a natural river will contain both locally derived and upstream-inherited flow structures, according to the range of scales of bed topography present.

Item Type:Article
Keywords:Coherent flow structures, Gravel bed rivers.
Full text:PDF - Published Version (561Kb)
Status:Peer-reviewed
Publisher Web site:http://dx.doi.org/10.1029/2006WR004936
Publisher statement:© 2007 American Geophysical Union. Hardy, R. J. and Lane, S. N. and Ferguson, R. I. and Parsons, D. R., (2007), 'Emergence of coherent flow structures over a gravel surface: a numerical experiment, Water resources research, 43, W03422, 10.1029/2006WR004936 (DOI). To view the published open abstract, go to http://dx.doi.org and enter the DOI.
Record Created:06 Oct 2008
Last Modified:03 Aug 2011 16:31

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