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Apparent Friction Coefficient Used for Flow Calculation in Straight Compound Channels

Faculty of Civil- and Environmental Engineering, Warsaw University of Life Sciences-SGGW, 02-787 Warsaw, Poland
Author to whom correspondence should be addressed.
Water 2019, 11(4), 745;
Received: 28 March 2019 / Revised: 5 April 2019 / Accepted: 7 April 2019 / Published: 10 April 2019
(This article belongs to the Section Hydraulics)
PDF [2166 KB, uploaded 10 April 2019]


Water flow in channels with a compound cross-section involves an exchange of water mass and momentum between the slower flowing water in the floodplains and the faster water in the main channel. This process is called the streams interaction. As a result, the water velocity in the main channel decreases, and at the same time the velocity and depth of flow increase in the part of the floodplains adjacent to the main channel. Diversification of the surface roughness of the main channel and floodplains significantly affects the form of interactions. The results of laboratory experiments were used to characterize the influence of interactions on the discharge capacity of the channel with diversified roughness. The reduction in velocity of the main channel caused by the stream interactions is described with the apparent friction coefficients introduced at the boundary between the main channel and the floodplain. The obtained values of resistance coefficients, supplemented with the values from experiments reported in the literature, were used to establish a relationship useful in assessing the discharge capacity of such channels. View Full-Text
Keywords: compound channels; interaction of stream; apparent friction coefficient compound channels; interaction of stream; apparent friction coefficient

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Kubrak, E.; Kubrak, J.; Kozioł, A.; Kiczko, A.; Krukowski, M. Apparent Friction Coefficient Used for Flow Calculation in Straight Compound Channels. Water 2019, 11, 745.

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