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Resonant generation of internal waves by short length scale topography

Stastna, Marek

Physics of fluids (1994), 2011-11, Vol.23 (11), p.116601-116601-10 [Periódico revisado por pares]

Melville, NY: American Institute of Physics

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  • Título:
    Resonant generation of internal waves by short length scale topography
  • Autor: Stastna, Marek
  • Assuntos: Dynamics of the ocean (upper and deep oceans) ; Earth, ocean, space ; Exact sciences and technology ; External geophysics ; Physics of the oceans
  • É parte de: Physics of fluids (1994), 2011-11, Vol.23 (11), p.116601-116601-10
  • Descrição: We consider the resonant generation of internal waves by small-amplitude topography with multiple local maxima. We demonstrate that for near-critical inflows, the initial resonant generation process is locked to the topography. However, the process undergoes a profound reorganization in the long time limit, and over the topography yields waves with an amplitude that is larger than the theoretical maximum for waves far upstream. For subcritical flows, we demonstrate that short length-scale topography can successfully generate finite amplitude, quasi-periodic mode-1 waves, but that the most energetic of these are confined to the region over and downstream of the topography. We demonstrate that, due to the inherently shorter length scale of higher mode solitary waves, subcritical flows over short topography can generate mode-2 waves even for stratifications whose center is well removed from the mid-depth. Finally, we discuss the implications of our results to slowly changing currents such as tides, namely that periods of near critical flow dominate wave generation.
  • Editor: Melville, NY: American Institute of Physics
  • Idioma: Inglês
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