Forced Hydraulic Jumps below Abrupt Expansions
Publication: Journal of Hydraulic Engineering
Volume 137, Issue 8
Abstract
A new approach for studying forced hydraulic jumps below abrupt symmetric and asymmetric expansions is introduced. Intensive experiments for two expansion ratios, one asymmetry ratio, and different solid sill heights and locations were conducted specifically for the spatial jump case as a critical design case. A new parameter correlating sill height and sill location is presented and found to play an important role in the basin’s design, scour, and flow patterns. Using this parameter gives distinguished relationships for predicting sequent depth, energy dissipation, and basin length for the preliminary or operating design in expected or unexpected flow conditions. Empirical equations and experimental regression curves are introduced to predict the sequent depth and the basin length at any sill height and sill location. Scour and flow patterns are intensively studied experimentally and qualitatively described for the symmetric and asymmetric basins with or without sills for the spatial jump. A numerical example is presented to illustrate the applicability of the study in preliminary and operating designs.
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Acknowledgments
The authors acknowledge the Natural Sciences and Engineering Research Council of Canada (NSERC), which supported the experimental work of this study.
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© 2011 American Society of Civil Engineers.
History
Received: May 17, 2010
Accepted: Nov 18, 2010
Published online: Nov 22, 2010
Published in print: Aug 1, 2011
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