Hydraulic Resistance of Flow in Channels with Cylindrical Roughness
Publication: Journal of Hydraulic Engineering
Volume 128, Issue 5
Abstract
A laboratory study on the hydraulics of flow in an open channel with circular cylindrical roughness is presented. The laboratory study consists of an extensive set of flume experiments for flows with emergent and submerged cylindrical stems of various sizes and concentrations. The results show that the flow resistance varies with flow depth, stem concentration, stem length, and stem diameter. The stem resistance experienced by the flow through the vegetation is best expressed in terms of the maximum depth-averaged velocity between the stems. Physically based formulas for flow resistance, the apparent channel velocity, and flow velocities in the roughness and surface layers are developed. The formulas are validated with the flume data from the present study as well as those from past studies. A method for calculating channel hydraulic conditions using these formulas is presented.
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Information
Published In
Journal of Hydraulic Engineering
Volume 128 • Issue 5 • May 2002
Pages: 500 - 506
Copyright
Copyright © 2002 American Society of Civil Engineers.
History
Received: Apr 27, 1999
Accepted: Sep 27, 2001
Published online: Apr 15, 2002
Published in print: May 2002
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