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Comparisons of sidewall correction of bed shear stress in open-channel flows.

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Comparisons of sidewall correction of bed shear stress in open-channel flows.

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dc.contributor.author Cheng, Nian-Sheng
dc.contributor.author Chua, Lloyd Hock Chye.
dc.date.accessioned 2012-03-22T08:24:12Z
dc.date.available 2012-03-22T08:24:12Z
dc.date.copyright 2005
dc.date.issued 2012-03-22
dc.identifier.citation Cheng, N. S. & Chua, L. H. C. (2005). Comparisons of Sidewall Correction of Bed Shear Stress in Open-Channel Flows. Journal of Hydraulic Engineering, 131(7), 605-609.
dc.identifier.issn 0733-9429 (print)
dc.identifier.uri http://hdl.handle.net/10220/7664
dc.description.abstract When investigating sediment transport in laboratory open-channel flows, it is often necessary to remove sidewall effects for computing effective bed shear stress. Previous sidewall correction methods are subject to some assumptions that have not been completely verified, and different values of the bed shear stress may be obtained depending on the approach used in making sidewall corrections. This study provides a quantitative assessment of the existing correction procedures by comparing them to a new sidewall correction model proposed in this study. The latter was derived based on the shear stress function and equivalent roughness size for both rigid and mobile bed conditions, which were obtained directly from experimental measurements. The comparisons show that the Einstein correction formula and the Vanoni and Brooks method generally predict relatively lower and higher bed shear stresses, respectively, while the Williams' empirical function leads to more scatter. This study also demonstrates that the widely used Vanoni and Brooks approach can be well approximated by a simple formula derived based on the Blasius resistance function. The sidewall effects, when removed in the different ways, would consequently affect the presentation of the bedload function. Experimental results of bedload transport, when plotted as the dimensionless transport rate against the dimensionless shear stress with the latter being corrected using the present model, exhibit less scatter than those associated with the previous procedures.
dc.format.extent 24 p.
dc.language.iso en
dc.relation.ispartofseries Journal of hydraulic engineering
dc.rights © 2005 ASCE. This is the author created version of a work that has been peer reviewed and accepted for publication by Journal of hydraulic engineering, American Society of Civil Engineers. 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/10.1061/(ASCE)0733-9429(2005)131:7(605)].
dc.subject DRNTU::Engineering::Civil engineering::Water resources.
dc.title Comparisons of sidewall correction of bed shear stress in open-channel flows.
dc.type Journal Article
dc.contributor.school School of Civil and Environmental Engineering
dc.identifier.doi http://dx.doi.org/10.1061/(ASCE)0733-9429(2005)131:7(605)

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