Residual Energy on Ski-Jump-Step and Stepped Spillways with Various Step Configurations
Publication: Journal of Hydraulic Engineering
Volume 146, Issue 4
Abstract
To better understand the effects of optimized step configurations and preaeration structure of a ski-jump-step spillway on the residual energy of skimming flows, skimming flow experiments were conducted on both ski-jump-step and stepped spillway models. Horizontal, inclined, and pooled steps were tested on each. The results show a significant reduction in residual energy of the ski-jump-step spillway compared to that of the stepped spillway. Use of the inclined and pooled steps on the ski-jump-step spillway aids in further reducing the residual energy, particularly under large unit discharges. The authors introduce a new geometrical parameter of steps, the area of cavity, and find that it is negatively correlated with the residual energy. A unifying correlation showing the relationship among residual energy, unit discharge, slope of step, and area of cavity is established for evaluating the residual energy of skimming flows on ski-jump-step and stepped spillways with various step configurations.
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published article.
Acknowledgments
The authors acknowledge the financial support of the National Natural Science Foundation of China (Grant No. 51479057), the Fundamental Research Funds for Central Universities (Grant No. 2019B18414), and the China Postdoctoral Science Foundation (Grant No. 2018M632218).
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Information & Authors
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Published In
Journal of Hydraulic Engineering
Volume 146 • Issue 4 • April 2020
Copyright
©2020 American Society of Civil Engineers.
History
Received: Mar 28, 2019
Accepted: Aug 23, 2019
Published online: Jan 20, 2020
Published in print: Apr 1, 2020
Discussion open until: Jun 20, 2020
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