scholarly journals High-frequency internal waves in the littoral zone of a large lake

2006 ◽  
Vol 51 (4) ◽  
pp. 1935-1939 ◽  
Author(s):  
Andreas Lorke ◽  
Frank Peeters ◽  
Erich Bäuerle
Keyword(s):  
Internal Waves ◽  
High Frequency ◽  
Littoral Zone ◽  
Large Lake

scholarly journals Opposing diel migration of fish and zooplankton in the littoral zone of a large lake

Hydrobiologia ◽  
2007 ◽  
Vol 600 (1) ◽  
pp. 139-146 ◽  
Author(s):  
Andreas Lorke ◽  
Arnd Weber ◽  
Hilmar Hofmann ◽  
Frank Peeters
Keyword(s):  
Littoral Zone ◽  
Large Lake ◽  
Diel Migration

scholarly journals High-frequency internal waves near the Luzon Strait observed by underwater gliders

2013 ◽  
Vol 118 (2) ◽  
pp. 774-784 ◽  
Author(s):  
Daniel L. Rudnick ◽  
T. M. Shaun Johnston ◽  
Jeffrey T. Sherman
Keyword(s):  
Internal Waves ◽  
High Frequency ◽  
Luzon Strait ◽  
Underwater Gliders

Wavenumber transport: scattering of small-scale internal waves by large-scale wavepackets

1995 ◽  
Vol 289 ◽  
pp. 379-405 ◽  
Author(s):  
David L. Bruhwiler ◽  
Tasso J. Kaper
Keyword(s):  
Internal Waves ◽  
High Frequency ◽  
Large Scale ◽  
Wave Interaction ◽  
Initial Distribution ◽  
Small Scale ◽  
Theoretic Model ◽  
Frequency Interval ◽  
Crossing Theory ◽  
Invariance Theory

In this work, we treat the problem of small-scale, small-amplitude, internal waves interacting nonlinearly with a vigorous, large-scale, undulating shear. The amplitude of the background shear can be arbitrarily large, with a general profile, but our analysis requires that the amplitude vary on a length scale longer than the wavelength of the undulations. In order to illustrate the method, we consider the ray-theoretic model due to Broutman & Young (1986) of high-frequency oceanic internal waves that trap and detrap in a near-inertial wavepacket as a prototype problem. The near-inertial wavepacket tends to transport the high-frequency test waves from larger to smaller wavenumber, and hence to higher frequency. We identify the essential physical mechanisms of this wavenumber transport, and we quantify it. We also show that, for an initial ensemble of test waves with frequencies between the inertial and buoyancy frequencies and in which the number of test waves per frequency interval is proportional to the inverse square of the frequency, a single nonlinear wave–wave interaction fundamentally alters this initial distribution. After the interaction, the slope on a log-log plot is nearly flat, whereas initially it was -2. Our analysis captures this change in slope. The main techniques employed are classical adiabatic invariance theory and adiabatic separatrix crossing theory.

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