Probability Density Function of Instantaneous Drag Forces and Shear Stresses on a Bed
Publication: Journal of Hydraulic Engineering
Volume 132, Issue 11
Abstract
A probability density function (PDF) of the instantaneous bed shear stress in a turbulent flow is derived in this paper. It is argued that the shape of the PDF is similar to the PDF of the instantaneous drag forces on bed roughness elements. The influence of the near-bed relative turbulence intensity is included in the PDF. The shape of the distribution compares well with our measurements of the instantaneous drag force on a protruding bed element for a range of turbulence intensities. However, deviations are apparent at high turbulence intensities. The PDF also compares well with measurements of shear stresses on a smooth wall.
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Published In
Journal of Hydraulic Engineering
Volume 132 • Issue 11 • November 2006
Pages: 1169 - 1175
Copyright
© 2006 ASCE.
History
Received: Jul 10, 2003
Accepted: Dec 16, 2005
Published online: Nov 1, 2006
Published in print: Nov 2006
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