Approximation of velocity distribution in open channel flow

0342976 - ÚH 2011 RIV CZ eng C - Conference Paper (international conference)
Ivanova, Irina - Vlasák, Pavel - Chára, Zdeněk - Kysela, Bohuš
Approximation of velocity distribution in open channel flow.
Engineering Mechanics 2010. Prague: Institute of Thermomechanics AS CR, v. v. i., 2010 - (Zolotarev, I.), Article no. 030. ISBN 978-80-87012-26-0.
[Engineering Mechanics 2010. Svratka (CZ), 10.05.2010-13.05.2010]
R&D Projects: GA ČR GA103/09/1718
Institutional research plan: CEZ:AV0Z20600510
Keywords : spatial velocity profile * channel flow * vertical profile * lateral profile * power law * logarithmic law
Subject RIV: BK - Fluid Dynamics

The paper deals with approximation of spatial distribution of mean downstream velocity of sub-critical turbulent flow in an open rectangular channel with rough bed. New formulae of the local downstream velocity component Vx(y, z) dependence on the vertical coordinate y and lateral coordinate z were introduced. The vertical velocity profile was approximated by log-law and the power law was used to describe the effect of channel walls on the horizontal velocity profile. The suggested formulae of spatial downstream velocity component distribution were calibrated and verified using the experimental data obtained by PIV method. The proposed approximation is in good agreement with experimental data, the difference between experimental and calculated data is in range of 5 - 10% except the area near the channel’s corners and water level, where the maximal difference reaches 60% and 30% of experimental values, respectively.
Permanent Link: http://hdl.handle.net/11104/0185571