Influence of Relative Roughness and Reynolds Number on the Roll-Waves Spatial Evolution
Publication: Journal of Hydraulic Engineering
Volume 136, Issue 1
Abstract
The paper investigates the influence of the resistance coefficient variability onto the spatial development of roll-waves. Two models, based on time-asymptotic solutions of the linearized St. Venant equations, subject to either impulsive or oscillating perturbation, have been modified by including the dependence of the resistance coefficient on flow conditions, wall roughness, and fluid viscosity. Independently of the perturbation type, it has been shown that the hypothesis of constant resistance coefficient leads to underestimate the disturbance spatial growth. Theoretical predictions are finally compared with results of a fully nonlinear model and with literature experimental data for several combinations of Froude and Reynolds numbers and relative roughness values. The representation of variability of the resistance coefficient fundamentally improves the performance of minimum channel length criteria, whereas its neglect may lead to noncautious channel design.
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Information & Authors
Information
Published In
Journal of Hydraulic Engineering
Volume 136 • Issue 1 • January 2010
Pages: 24 - 33
Copyright
© 2010 ASCE.
History
Received: Oct 1, 2008
Accepted: Jul 10, 2009
Published online: Jul 13, 2009
Published in print: Jan 2010
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