Bulletin of the American Physical Society
71st Annual Meeting of the APS Division of Fluid Dynamics
Volume 63, Number 13
Sunday–Tuesday, November 18–20, 2018; Atlanta, Georgia
Session L35: Geophysical Fluid Dynamics: General
4:05 PM–6:41 PM,
Monday, November 19, 2018
Georgia World Congress Center Room: B407
Chair: Alfredo Pinelli, City University London
Abstract ID: BAPS.2018.DFD.L35.9
Abstract: L35.00009 : On the vertical variation of turbulence statistics in open channel flow*
5:49 PM–6:02 PM
(Naval Research Lab)
(Naval Research Lab)
Edwin A Cowen
Nezu (1977) established a set of universal exponential expressions for the vertical variation of the turbulence intensities following a series of open channel flow laboratory experiments. Each of these relationships contains an empirical coefficient that differs with the component direction (Du = 2.3, Dv = 1.27, Dw = 1.63). Recent laboratory experiments have demonstrated that for open channel flows these constants are not universal but vary with the Reynolds number and bed composition. A method for the remote prediction of Du and hence, the vertical variation of the streamwise turbulence intensity is developed here. The method uses the free surface turbulence anisotropy as a proxy for the redistribution of vertical velocity fluctuations into surface parallel components enabling a correlation between the free surface turbulence intensity and Du. Implications for the remote prediction of bed composition, sediment transport and bed shear stress are discussed.
*The authors would like to thank the National Research Council Postdoctoral Program and the National Institutes for Water Resources for their support of this work.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.DFD.L35.9
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