Negative Surges in Open Channels: Physical and Numerical Modeling
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Volume 139, Issue 3
Abstract
Negative surges can be caused by a sudden change in flow resulting from a decrease in water depth. In the present study, some physical experiments were conducted in a rectangular channel to characterize the unsteady free-surface profile and longitudinal velocity beneath a negative surge propagating upstream. The physical observations showed that, during the first initial instants, the celerity of the surge leading edge increased rapidly with time, while later the negative surge propagated upstream in a more gradual manner with a celerity decreasing slowly with increasing distance. The velocity data highlighted some relatively large turbulent fluctuations beneath the negative surge. The physical results were used to test the analytical solution of the Saint-Venant equations and some numerical models. The findings suggested that the negative surge propagation appeared relatively little affected by the boundary friction within the investigated flow conditions.
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Acknowledgments
The authors thank Graham Illidge, Clive Booth, and Ahmed Ibrahim (The University of Queensland) for their technical assistance. They thank further Dr. Luke Toombes (Aurecon) for his valuable advice and inputs. The assistance of Prof. Peter Rutschmann (Technical University of Munich) to perform the CFD modeling is acknowledged. The authors acknowledge the helpful comments of Prof. Fabian Bombardelli (UC Davis), Prof. John Fenton (Technical University of Vienna), and Dr. Pierre Lubin (University of Bordeaux). The financial support of the Australian Research Council (Grant DP120100481) is acknowledged.
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Information & Authors
Information
Published In
Journal of Hydraulic Engineering
Volume 139 • Issue 3 • March 2013
Pages: 341 - 346
Copyright
© 2013 American Society of Civil Engineers.
History
Received: Nov 2, 2011
Accepted: Sep 5, 2012
Published online: Sep 6, 2012
Published in print: Mar 1, 2013
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