Physics
Scientific paper
Aug 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002georl..29p..16s&link_type=abstract
Geophysical Research Letters, Volume 29, Issue 16, pp. 16-1, CiteID 1769, DOI 10.1029/2002GL015321
Physics
2
Oceanography: Physical: Internal And Inertial Waves, Meteorology And Atmospheric Dynamics: Waves And Tides, Meteorology And Atmospheric Dynamics: Mesoscale Meteorology
Scientific paper
Laboratory experiments show that as uniformly stratified fluid flows over a smoothly-varying step, two wave-like phenomena result: boundary-trapped lee waves, characterized by an undular shear layer downstream of the base of the step, and internal waves, which propagate vertically away from the step. The frequency of both types of waves is an approximately constant fraction of the buoyancy frequency. The frequency of internal waves is moderately smaller than lee waves if the step size is small but, if the step size is large, the frequencies match more closely. Thus nonlinear dynamics act so that internal waves are generated not by topography alone but also by flow over the boundary-trapped lee waves that act as ``fluidic'' hills. This new mechanism for internal wave generation may be an important factor in mixing over rough topography in the ocean.
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