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Open channel flow resistance
Yen, B.C. (2002). Open channel flow resistance. J. Hydraul. Eng. 128(1): 20-39
In: Journal of Hydraulic Engineering. American Society of Civil Engineers (ASCE): New York, NY. ISSN 0733-9429; e-ISSN 1943-7900, more
Peer reviewed article  

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Keyword
    Open channel flow

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  • Yen, B.C.

Abstract
    In 1965, Rouse critically reviewed hydraulic resistance in open channels on the basis of fluid mechanics. He pointed out the effects of cross-sectional shape, boundary non uniformity, and flow unsteadiness, in addition to viscosity and wall roughness that are commonly considered. This paper extends that study by discussing the differences between momentum and energy resistances, between point, cross-sectional and reach resistance coefficients, as well as compound/composite channel resistance. Certain resistance phenomena can be explained with the inner and outer laws of boundary layer theory. The issue of linear-separation approach versus nonlinear approach to alluvial channel resistances also is discussed. This review indicates the need for extensive further research on the subject.

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