The statistical processing of a high-frequency motion picture has enabled us to establish that a flow interface consisting of individual discrete particles is a surface which varies in time and space with a deviation from its average position on both sides which is of the same order as the average height of the jumps of the solid particles. The take-off level of the solid particles in these jumps is with large probability higher than the landing level. The distribution of rms deviations of the vertical component of the velocity of the solid particles over the flow depth has two maxima (above the average interface and at the level of the interface). On the distribution curve for the rms deviations of the horizontal velocity component only the first maximum is clearly expressed.

Московский государственный университет имени М.В. Ломоносова, физический факультет, кафедра Физики моря и вод суши. Россия, 119991, Москва, Ленинские горы, д. 1, стр. 2