Turbulent Generation of Internal Waves |

Experimental Setup | |

Vertical time series showing deeping of mixed layer by grid-generated turbulence. Internal waves are generated beneath the mixed layer | |

Horizontal time series showing evolution over time of eddies and the mean circulation in the mixing layer a small distance below the oscillating grid. | |

Definition of eddy time scale using an autocorrelation function | |

Observed scaling behaviour in uniform mixing region. The eddy time-scale increases in proportion with the distance below the grid, in accordance with scaling theory. |

In this work we have developed a new technique to

- measure internal wave amplitudes and frequencies
- characterize turbulence time and length scales

The results show

- internal wave amplitude decreases with increasing density stratification
- eddy size increases linearly with distance from the turbulence source

Research by Kathleen Dohan and Bruce R. Sutherland

Last updated by: Bruce R. Sutherland, Dec. 99,