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Two-layer hydraulics with comparable internal wave speeds

Published online by Cambridge University Press:  26 April 2006

Richard Williams  and
Laurence Armi
Richard Williams
Affiliation:
Scripps Institution of Oceanography, La Jolla, CA 92093-0230, USA
Laurence Armi
Affiliation:
Scripps Institution of Oceanography, La Jolla, CA 92093-0230, USA
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Abstract

Two-layer hydraulics is developed for problems in which the moving layers can have stagnant layers above and below, the two internal wave modes can have comparable speeds and the total depth of the moving layers may vary. The general development allows both Boussinesq and non-Boussinesq problems to be studied. Solutions are presented in the Froude-number plane and the effect of different layer densities on the form of the solution space is shown. The theory is applied to two-layer plunging flows and a variety of controlled solutions are found. Solutions for the 2½-layer theory and the plunging flow theory are demonstrated experimentally. Shear instability is often observed in the divergent section of the channel.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 230 , September 1991 , pp. 667 - 691
Copyright
© 1991 Cambridge University Press

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