The results of an instrumental study of the structure of flows oyer roughness whose dimensions are comparable to the scale of the flow itself are reported. The work was done under natural conditions on the Polomet River and in the laboratory, using a water channel and a wind tunnel. Averaged flow velocity profiles measured in various cross sections downstream from the roughness and spectral density functions of the absolute velocity fluctuations are presented. It is shown that when air and water flow over course roughness, separated flows form behind the latter.
Department of Marine and Inland-Water Physics
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