EGU2020-18419
https://doi.org/10.5194/egusphere-egu2020-18419
EGU General Assembly 2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Experimental internal gravity wave turbulence

Géraldine Davis1,2, Thierry Dauxois2, Sylvain Joubaud2,3, Timothée Jamin2, Nicolas Mordant1, and Clément Savaro1
Géraldine Davis et al.
  • 1Laboratoire des Ecoulements Géophysiques et Industriels, Université Grenoble Alpes, CNRS, Grenoble-INP, Grenoble, France (geraldine.davis@univ-grenoble-alpes.fr)
  • 2Univ Lyon, ENS de Lyon, Univ Claude Bernard, CNRS, Laboratoire de Physique, Lyon, France
  • 3Institut Universitaire de France (IUF)

Stratified fluids may develop simultaneously turbulence and internal wave turbulence, the latter describing a set of a large number of dispersive and weakly nonlinear interacting waves. The description and understanding of this regime for internal gravity waves (IGW) is really an open subject, in particular due to their very unusual dispersion relation. In this presentation, I will show experimental signatures of a large set of weakly interacting IGW obtained in a 2D trapezoidal tank.

Due to the peculiar linear reflexion law of IGW on inclined slopes, this setup - for given excitation frequencies - focuses all the input energy on a closed loop called attractor. If the forcing is large enough, this attractor destabilizes and the system eventually achieves a nonlinear cascade in frequencies and wavevectors via triadic resonant interactions, which results at large forcing amplitudes in a k^-3 spatial energy spectrum. I will also show some results obtained in a much larger set-up -the Coriolis facility in Grenoble- with signature of 3D internal wave turbulence.

How to cite: Davis, G., Dauxois, T., Joubaud, S., Jamin, T., Mordant, N., and Savaro, C.: Experimental internal gravity wave turbulence, EGU General Assembly 2020, Online, 4–8 May 2020, EGU2020-18419, https://doi.org/10.5194/egusphere-egu2020-18419, 2020

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