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Dynamics of vortices on a uniformly shelving beach

Dynamics of vortices on a uniformly shelving beach
Dynamics of vortices on a uniformly shelving beach
Laboratory experiments are described which investigate the dynamics of a vortex dipole moving in water towards a planar sloping beach inclined at an angle [alpha] to the horizontal. Results are compared with those of a vortex ring model first developed by Peregrine (1996). The vortices separate as they travel up the beach, eventually moving in opposite directions and nearly parallel to the shoreline. The ranges of conditions examined are 3°[less-than-or-eq, slant][alpha][less-than-or-eq, slant]45°, 1×103[less-than-or-eq, slant]Re[less-than-or-eq, slant]6×103 and 0.05[less-than-or-eq, slant]Fr[less-than-or-eq, slant]0.14, where Re and Fr are the on-slope Reynolds number and the Froude number of the vortices, respectively. The minimum distance from the shoreline reached by the vortices and their along-shore speed are in general agreement with the predictions when, respectively, R*i<3 (where R*i is the non-dimensional initial distance of the vortices from the shore-line) and Re[greater, similar]1500. The vortex ring model is likely to have useful applications to the study of the dynamics of the near-shore zone.
FLUID DYNAMICS, NEARSHORE DYNAMICS, MODELS
0022-1120
211-228
Centurioni, L.R.
f3fd06c8-4a9d-4ff4-8b86-d30c7a5dfe03
Centurioni, L.R.
f3fd06c8-4a9d-4ff4-8b86-d30c7a5dfe03

Centurioni, L.R. (2002) Dynamics of vortices on a uniformly shelving beach. Journal of Fluid Mechanics, 472, 211-228. (doi:10.1017/S0022112002002252).

Record type: Article

Abstract

Laboratory experiments are described which investigate the dynamics of a vortex dipole moving in water towards a planar sloping beach inclined at an angle [alpha] to the horizontal. Results are compared with those of a vortex ring model first developed by Peregrine (1996). The vortices separate as they travel up the beach, eventually moving in opposite directions and nearly parallel to the shoreline. The ranges of conditions examined are 3°[less-than-or-eq, slant][alpha][less-than-or-eq, slant]45°, 1×103[less-than-or-eq, slant]Re[less-than-or-eq, slant]6×103 and 0.05[less-than-or-eq, slant]Fr[less-than-or-eq, slant]0.14, where Re and Fr are the on-slope Reynolds number and the Froude number of the vortices, respectively. The minimum distance from the shoreline reached by the vortices and their along-shore speed are in general agreement with the predictions when, respectively, R*i<3 (where R*i is the non-dimensional initial distance of the vortices from the shore-line) and Re[greater, similar]1500. The vortex ring model is likely to have useful applications to the study of the dynamics of the near-shore zone.

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More information

Published date: 2002
Keywords: FLUID DYNAMICS, NEARSHORE DYNAMICS, MODELS

Identifiers

Local EPrints ID: 6015
URI: http://eprints.soton.ac.uk/id/eprint/6015
ISSN: 0022-1120
PURE UUID: be313c3f-243a-4082-800e-758d32060e0e

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Date deposited: 08 Jun 2004
Last modified: 15 Jul 2019 19:38

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