The results of complex natural measurements in the upper contact zone of near-floor density flow are used to analyze the repeating cyclic transformations of the structure of the boundary layer of the flow which were observed by registrations lasting several hours. We establish the interdependence of the appearance of fine structure elements of the mixed layer in the stratified flow, such as the lens of translucent liquid, temperature inversions, minima in the velocity profiles, and of the root-mean-square values of its fluctuations. An analysis of the results of discrete and continuous measurements of the profiles of velocity, concentration of suspension and temperature, and aslo the use of spectral analysis, make it possible to interpret the observed phenomena as the effects of generation and dissipation of outer-scale turbulent formations on the vertical structure of the boundary layer. This interpretation is confirmed by quantitative estimates, and agrees well with the main stages of the real process.
Faculty of Physics, Moscow State University, Leninskie Gory, Moscow, 119992, Russia
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