Breaking and cascade of internal gravity waves in a continuously stratified fluid |
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Authors: | P. Bouruet-Aubertot J. Sommeria C. Staquet |
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Affiliation: | (1) Ecole Normale Supérieure de Lyon (URA 1325 CNRS), 46 allée d'Italie, 69364 Lyon Cedex 07, France |
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Abstract: | The evolution of a few large scale high frequency standing internal waves confined to a vertical plane is studied numerically. The growth of nonlinear interactions leads to a transfer of energy toward small vertical scales and lower frequencies: the result is a steep energy decrease due to wave breaking. Induced mixing is evaluated. A parametric forcing is also introduced in order to compare with laboratory experiments. Wave breaking also occurs but as opposed to the unforced case different phases are next observed: internal wave growth due to constructive forcing alternate with energy decrease. |
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Keywords: | internal waves parametric instability wavebreaking mixing |
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