Evaluation of Flow Resistance in Smooth Rectangular Open Channels with Modified Prandtl Friction Law

Flow resistance in open channels is usually estimated by applying the approach that is developed originally for pipe flows. Such estimates may be useful for engineering applications but always differ from measurements to some extent. This paper first summarizes empirical approaches that have been pr...

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Bibliographic Details
Published in:Journal of hydraulic engineering (New York, N.Y.) N.Y.), 2011-04, Vol.137 (4), p.441-450
Main Authors: Cheng, Nian-Sheng, Nguyen, Hoai Thanh, Zhao, Kuifeng, Tang, Xiaonan
Format: Article
Language:English
Subjects:
Applied sciences
Buildings. Public works
Channels
Computation methods. Tables. Charts
Estimates
Exact sciences and technology
Flow resistance
Friction
Hydraulic constructions
Law
Mathematical analysis
Open channel flow
Pipe
Structural analysis. Stresses
TECHNICAL PAPERS
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Summary:Flow resistance in open channels is usually estimated by applying the approach that is developed originally for pipe flows. Such estimates may be useful for engineering applications but always differ from measurements to some extent. This paper first summarizes empirical approaches that have been proposed in the literature to reconcile the resistance difference. These include various modifications of the pipe friction for applications to rectangular ducts and open channel flows. An improved friction equation is then derived for evaluating flow resistance of smooth rectangular open channels. Comparisons are made with experimental data reported by previous researchers and those collected in the present study. It is shown that the new proposed equation is applicable for both narrow and wide channels and is more accurate than those available in the literature.
ISSN:0733-9429
1943-7900
DOI:10.1061/(ASCE)HY.1943-7900.0000322