Research Article
Dec 1981
Resistance Equation for Large-Scale Roughness
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VIEW THE REPLYPublication: Journal of the Hydraulics Division
Volume 107, Issue 12
Abstract
A theory of flow resistance for large-scale roughness is developed, the main points of which are supported by a flume study from which the outline of a process-based resistance equation is determined. Rivers with large-scale roughness have steep slopes and depths of the same order of magnitude as the bed material size. Flow resistance depends on the form drag of the roughness elements and their disposition in the channel. Theoretical considerations show resistance to be a function of Reynolds number, Froude number, roughness geometry, and channel geometry. These processes are examined using the results of flume experiments based on five different roughness beds and a wide range of flows. Semi-empirical analysis supports the theory and allows the development of a theoretical power law resistance equation which accounts for most of the processes. A summary of the data is presented for use in other research studies.
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Published In
Journal of the Hydraulics Division
Volume 107 • Issue 12 • December 1981
Pages: 1593 - 1613
Copyright
© 1981 American Society of Civil Engineers.
History
Published in print: Dec 1981
Published online: Feb 3, 2021
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Authors
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James C. Bathurst
Sr. Scientific Officer, Inst. of Hydro., Wallingford, Oxon, United Kingdom
Daryl B. Simons, F.ASCE
Assoc. Dean, Coll. of Engrg., and Prof. of Civ. Engrg., Colorado State Univ., Fort Collins, Colo.
Ruh-Ming Li, M.ASCE
Assoc. Prof. of Civ. Engrg., Colorado State Univ., Fort Collins, Colo.
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Terms of Use: ASCE Library Cards are for individual, personal use only. Reselling, republishing, or forwarding the materials to libraries or reading rooms is prohibited.
Terms of Use: ASCE Library Cards are for individual, personal use only. Reselling, republishing, or forwarding the materials to libraries or reading rooms is prohibited.