Zeng, Y. H., Guymer, I., Spence, K. J. and Huai, W. X. (2012) Application of analytical solutions in trapezoidal compound channel flow. River Research and Applications, Vol.28 (No.1). pp. 53-61. doi:10.1002/rra.1433

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Abstract

The accuracy of predictions using an analytical model for a lateral depth varying open channel flow can be affected by the friction factor and the dimensionless eddy viscosity. In this paper, different approaches to determine these two parameters are discussed by comparing analytical results with experimental data obtained from a symmetrical trapezoidal compound open channel. To reflect different hydraulic characteristics along the wetted perimeter, the trapezoidal cross-section was divided into several sub-sections, and the friction factor in each sub-section was calculated with Manning's formula by adopting local hydraulic parameters. The wetted perimeters of main channel and side slope included the interface between panels to reflect the effects of the lateral momentum exchange. This approach is shown to be effective once the roughness coefficients and hydraulic radius in different sub-regions have been determined. The results show that the friction factor is the major parameter affecting the accuracy of the analytical solution. The effect of dimensionless eddy viscosity on the precision of predictions is much smaller, which means that for practical applications, the dimensionless eddy viscosity can be determined empirically. Inclusion of a term for secondary flows in the model can improve the prediction, especially in the transition from main channel to the floodplain. A reasonable prediction of the lateral distribution of depth mean Reynolds' stress in this region is obtained. Copyright (C) 2010 John Wiley & Sons, Ltd.

Item Type:	Journal Article
Subjects:	T Technology > TA Engineering (General). Civil engineering (General)
Divisions:	Faculty of Science > Engineering
Journal or Publication Title:	River Research and Applications
Publisher:	John Wiley & Sons Ltd.
ISSN:	1535-1459
Official Date:	January 2012
Dates:	Date Event January 2012 Published
Volume:	Vol.28
Number:	No.1
Page Range:	pp. 53-61
DOI:	10.1002/rra.1433
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access
Funder:	Engineering and Physical Sciences Research Council (EPSRC), Natural Science Foundation of China
Grant number:	GR/K/04651 (EPSRC), 50709025 50979078 (Natural Science Foundation of China)

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