A technique is developed for determining the vertical profile of the mean velocity of a stream in an upper millimetric layer. The results are cited of a synchronous measurement of the velocity and temperature in a laboratory stream. It is explained that the upper part of a cold film with a thickness of several tenths of millimeters is a laminar sublayer with a linear velocity and temperature profile. The thickness of the sublayer is reduced with a rise in the velocity of the stream, while the gradients of velocity and temperature are increased.
Department of Marine and Inland Water Physics, Faculty of Physics, Moscow State University, Leninskie Gory, Moscow, 119992, Russia