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Permanent link (DOI): https://doi.org/10.7939/R3MP4V

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Generation, propagation and breaking of an internal gravity wave beam Open Access

Descriptions

Other title
Subject/Keyword
waves
experiments
instability
internal
turbulence
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Clark, Heather A
Supervisor and department
Sutherland, Bruce (Physics & Earth and Atmospheric Sciences)
Examining committee member and department
Swaters, Gordon (Mathematical and Statistical Sciences)
Heimpel, Moritz (Physics)
Flynn, Morris (Mechanical Engineering)
Department
Department of Physics
Specialization

Date accepted
2009-11-20T20:29:46Z
Graduation date
2010-06
Degree
Master of Science
Degree level
Master's
Abstract
We report upon an experimental study of internal gravity waves generated by the large-amplitude vertical oscillations of a circular cylinder in uniformly stratified fluid. Quantitative measurements are performed using a modified synthetic schlieren technique for strongly stratified solutions of NaCl or NaI. Oscillatory turbulent patches that develop around the cylinder are found to be the primary source of the observed quasi-monochromatic wave beams whose characteristics differ from theoretical predictions and experimental investigations of waves generated by small-amplitude cylinder oscillations. Over long times the waves break down into turbulence that is examined quantitatively through conductivity probe measurements and qualitatively through unprocessed synthetic schlieren images. Based on observations of the location of wave breakdown we determine that the likely mechanism for breakdown is through parametric subharmonic instability. This conclusion is supported by fully nonlinear numerical simulations of the evolution of a temporally monochromatic internal wave beam.
Language
English
DOI
doi:10.7939/R3MP4V
Rights
License granted by Heather Clark (haclark@ualberta.ca) on 2009-11-19T19:08:51Z (GMT): Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of the above terms. The author reserves all other publication and other rights in association with the copyright in the thesis, and except as herein provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
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