Parameterization of the logarithmic layer of double-averaged streamwise velocity profiles in gravel-bed river flows

The logarithmic layer of double-averaged (in time and space) streamwise velocity profiles obtained from field measurements made in the Swiss rivers, Venoge and Chamberonne is parameterized and discussed. Velocity measurements were made using a 3D Acoustic Doppler Velocity Profiler. Both riverbeds ar...

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Published in:Advances in water resources 2008-06, Vol.31 (6), p.915-925
Main Authors: Franca, Mário J, Ferreira, Rui M.L, Lemmin, Ulrich
Format: Article
Language:English
Subjects:
Earth sciences
Earth, ocean, space
Exact sciences and technology
Freshwater
gravel river beds
hydrologic models
Hydrology
Hydrology. Hydrogeology
mathematical models
rivers
stream channels
stream flow
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description The logarithmic layer of double-averaged (in time and space) streamwise velocity profiles obtained from field measurements made in the Swiss rivers, Venoge and Chamberonne is parameterized and discussed. Velocity measurements were made using a 3D Acoustic Doppler Velocity Profiler. Both riverbeds are hydraulically rough, composed of coarse gravel, with relative submergences (h/D sub(5) sub(0)) of 5.25 and 5.96, respectively. From the observations, the flow may be divided into three different layers: a roughness layer near the bed, an equivalent logarithmic layer and a surface or outer layer. It was found that a logarithmic law can describe the double-averaged profiles in the layer 0.30
doi_str_mv 10.1016/j.advwatres.2008.03.001
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subjects Earth sciences
Earth, ocean, space
Exact sciences and technology
Freshwater
gravel river beds
hydrologic models
Hydrology
Hydrology. Hydrogeology
mathematical models
rivers
stream channels
stream flow
title Parameterization of the logarithmic layer of double-averaged streamwise velocity profiles in gravel-bed river flows
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