Characteristics of Turbulent Flow in Submerged Jumps on Rough Beds
This article has been corrected.
VIEW CORRECTIONPublication: Journal of Engineering Mechanics
Volume 134, Issue 1
Abstract
The results of an experimental investigation on the flow field in submerged jumps on horizontal rough beds, detected by an acoustic Doppler velocimeter, are presented. Experiments were conducted for the conditions of submerged jumps, having submergence factors from 0.96 to 1.85 and jet Froude numbers from 2.58 to 4.87, over rough beds of Nikuradse’s equivalent sand roughness equaling 0.49, 0.8, 1.86, and . The vertical distributions of time-averaged velocity components, turbulence intensity components, and Reynolds stress at different streamwise distances from the sluice opening and the horizontal distribution of bed-shear stress are plotted. Vector plots of the flow field show that the rate of decay of jet velocity in a submerged jump increases with increase in bed roughness. The flow characteristics on rough beds, being different from those on smooth bed, are discussed from the point of view of similarity, growth of the length scale, and decay of the velocity and turbulence characteristics scales. The most important observation is that the flow in the fully developed zone is found to be self-preserving.
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Published In
Journal of Engineering Mechanics
Volume 134 • Issue 1 • January 2008
Pages: 49 - 59
Copyright
© 2008 ASCE.
History
Received: Feb 23, 2005
Accepted: Jul 16, 2007
Published online: Jan 1, 2008
Published in print: Jan 2008
Notes
Note. Associate Editor: Brett F. Sanders
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