Investigation of bed shear stresses subject to external turbulence

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Investigation of bed shear stresses subject to external turbulence

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Title: Investigation of bed shear stresses subject to external turbulence
Author: Cheng, Nian-Sheng; Sumer, B. Mutlu; Fredsøe, Jørgen
Copyright year: 2003
Abstract: The fluctuating bed shear stress has largely been investigated only for uniform channel flows and boundary layers. In practical engineering, the flow conditions are often modified due to the presence of various hydraulic structures. To what extent the modification affects the known characteristics of the bed shear stress is not clear. This study presents experimental results of the bed shear stress fluctuations, which are obviously subjected to external turbulence generated by superimposing artificial structures in the open channel flows. The statistical analysis of the measurements shows that the probability density function of the bed shear stress can be described by the lognormal function. Some associated relations concerning higher-order moments, skewness and kurtosis, which are derived from the lognormal function, are further compared with the experimental data. Physical implication of the skewed probability density distribution is finally discussed.
Subject: DRNTU::Engineering::Civil engineering::Water resources
Type: Journal Article
Series/ Journal Title: International journal of heat and fluid flow
School: School of Civil and Environmental Engineering
Rights: © 2003 Elsevier. This is the author created version of a work that has been peer reviewed and accepted for publication by International Journal of Heat and Fluid Flow, Elsevier. It incorporates referee’s comments but changes resulting from the publishing process, such as copyediting, structural formatting, may not be reflected in this document. The published version is available at: [DOI: http://dx.doi.org/10.1016/S0142-727X(03)00088-2].
Version: Accepted version

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