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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Bibliographic Details
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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Summary: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
ISSN:0309-1708
1872-9657
DOI:10.1016/j.advwatres.2008.03.001