Quantitative laboratory observations of internal wave reflection on ascending slopes

Details Quantitative laboratory observations of internal wave reflection on ascending slopes Quantitative laboratory observations of internal wave reflection on ascending slopes

2006-03-23

arxiv.org/abs/nlin/0603049v1

Physics of Fluids 18 (2006) 056602

Nonlinear Sciences

Pattern Formation and Solitons

Scientific paper

10.1063/1.2197528

Internal waves propagate obliquely through a stratified fluid with an angle that is fixed with respect to gravity. Upon reflection on a sloping bed, striking phenomena are expected to occur close to the slope. We present here laboratory observations at moderately large Reynolds number. A particle image velocimetry (PIV) technique is used to provide time resolved velocity fields in large volumes. The generation of the second and third harmonic frequencies are clearly demonstrated in the impact zone. The mechanism for nonlinear wavelength selection is also discussed. Evanescent waves with frequency larger than the Brunt-V\"ais\"al\"a frequency are detected and experimental results agree very well with theoretical predictions. The amplitude of the different harmonics after reflection are also obtained.

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