Please use this identifier to cite or link to this item:
https://hdl.handle.net/10316/3950
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. | URI: | https://hdl.handle.net/10316/3950 | DOI: | 10.1016/j.advwatres.2008.03.001 | Rights: | openAccess |
Appears in Collections: | FCTUC Eng.Civil - Artigos em Revistas Internacionais |
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filee74793c29fcc45918c1955dd9c454523.pdf | 933.63 kB | Adobe PDF | View/Open |
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