Low Froude Number Stilling Basins—Hydrodynamic Characterization
Publication: Journal of Hydraulic Engineering
Volume 147, Issue 4
Abstract
Hydraulic jumps, frequently present in energy dissipation structures, have been thoroughly investigated over the past . However, studies have focused primarily on the more common and more stable cases of large Froude number jumps. Investigations on low Froude number jumps, usually called transition jumps, are scarce, although they are used in a significant number of run-of-the-river, high-discharge, and low-head dams. This paper addresses the characterization of hydrodynamic pressures of low Froude number jumps. A two-dimensional experimental facility was used for that purpose. Results were compared with those from published studies covering transition jumps and stabilized jumps, to identify differences and similarities between them. The analysis considered common dimensionless statistical parameters, duly nondimensionalized. It was found that, for most of these parameters, low Froude number jumps behave differently from stabilized jumps. This can be attributed mainly to the hydraulic jump’s oscillating jet formed under the surface macroturbulent roller, as well as to the partially developed boundary layer of the incoming flow in low-head spillways.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request (all novel experimental data presented in charts).
Some or all data, models, or code used during the study were provided by a third party. Direct requests for these materials may be made to the provider as indicated in the Acknowledgments (data previously published in the literature).
Acknowledgments
The first author gratefully acknowledges CNPq, for funding during the Master Program. The authors also thank Dr. Endres, Mr. Souza, and Mrs. Hampe for sharing their data on pressures acting on stilling basins, as well as CAPES, Furnas Centrais Elétricas S.A., Foz do Chapecó Energia S.A., and IPH-UFRGS for their support.
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Journal of Hydraulic Engineering
Volume 147 • Issue 4 • April 2021
Copyright
© 2021 American Society of Civil Engineers.
History
Received: Jun 1, 2020
Accepted: Oct 22, 2020
Published online: Jan 30, 2021
Published in print: Apr 1, 2021
Discussion open until: Jun 30, 2021
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