Hydraulic Jumps in Sloping Channels: Sequent Depth Ratio
Publication: Journal of Hydraulic Engineering
Volume 132, Issue 10
Abstract
A large variety of hydraulic jumps on horizontal and sloping inverts at the end of an ogee standard weir is investigated. An ogee standard weir was used to create supercritical flow and slopes of 0.0, , , , and were built downstream of the weir. Based on the momentum equation in the horizontal direction, a method to predict the sequent depth ratio is presented. The theory agrees well with the results of the writers and previous investigators. A correlation was developed to predict the minimum Froude number needed to establish jumps on negative slopes. Observations showed that in those cases where the gravity force component in the jump was opposite to the flow direction, the water surface of the surface roller became undular and unstable. The hydraulic jump on an entirely adverse slope was almost impossible to control. The analysis of experimental data showed that the negative slope of the basin reduces the sequent depth ratio, while a positive slope increases the sequent depth ratio.
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Acknowledgments
The writers acknowledge Mr. Bagheri’s help in the experimental work and Mr. Rajaee for providing the experiments in his postgraduate work. Support provided by the Research Council of Isfahan University of Technology (IUT) is also appreciated.
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Information & Authors
Information
Published In
Journal of Hydraulic Engineering
Volume 132 • Issue 10 • October 2006
Pages: 1061 - 1068
Copyright
© 2006 ASCE.
History
Received: Jul 30, 2003
Accepted: Nov 8, 2005
Published online: Oct 1, 2006
Published in print: Oct 2006
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