Fluctuations of Turbulent Bed Shear Stress
Publication: Journal of Engineering Mechanics
Volume 129, Issue 1
Abstract
With the assumption that the bed shear stress fluctuates in a lognormal fashion, the probability density function (PDF) of the standardized bed shear stress is derived as a function of the relative shear stress intensity. The PDF is more skewed with larger relative intensities, but approaches a Gaussian function when the relative intensity is small. The computed PDF agrees well with the reported experimental data for flows over a smooth boundary. The higher-order moments of the bed shear stress, skewness, and kurtosis, are shown analytically to be also dependent on the relative intensity. The theoretical dependencies are then compared to a number of measurements available in the literature. The Reynolds number effect on the relative intensity is also discussed.
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Information
Published In
Journal of Engineering Mechanics
Volume 129 • Issue 1 • January 2003
Pages: 126 - 130
Copyright
Copyright © 2003 American Society of Civil Engineers.
History
Received: Apr 30, 2001
Accepted: May 30, 2002
Published online: Dec 13, 2002
Published in print: Jan 2003
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