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Title: Parameterization of the logarithmic layer of double-averaged streamwise velocity profiles in gravel-bed river flows
Authors: Franca, Mário J. 
Ferreira, Rui M. L. 
Lemmin, Ulrich 
Keywords: Double-averaged velocity profiles; Logarithmic law; Velocity field measurements
Issue Date: 2008
Citation: Advances in Water Resources. 31:6 (2008) 915-925
Abstract: 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/D50) 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 < z/h < 0.75. The parameterization of the logarithmic law is discussed. Special emphasis is given to the geometric parameters roughness and zero-displacement heights and to the equivalent von Karman constant.
DOI: 10.1016/j.advwatres.2008.03.001
Rights: openAccess
Appears in Collections:FCTUC Eng.Civil - Artigos em Revistas Internacionais

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