Origin and Structure of Turbulence in Stably Stratified Media

摘要: The origin and the structure of turbulence in stably stratified media are investigated through theoretical reasoning laboratory experiments. limitations existing stability theories parallel horizontal shear flows resulting critical gradient Richardson number discussed. reader is cautioned not to use criterion for predicting onset clear air at high altitude, as evidence shows that often sloping non-parallel. numerical computations study instability finite disturbances proposed. Three different types turbulent fluids observed experimentally with flow visualization techniques. first second experiments concerned respectively rotors lee a barrier breaking travelling internal waves on surface. These show that, large numbers, tends be sporadic, patchy violent. third experiment wake cylinder. In this experiment, combined wave-turbulence behavior clearly demonstrated shadowgraph pictures, which attenuated rapidly downstream while persist. Some preliminary results spectra correlations measured quartz-coated hot-film probes presented.