Multiple Inflow Branches at Supercritical-Type Vortex Drop Shaft
Publication: Journal of Hydraulic Engineering
Volume 144, Issue 11
Abstract
Vortex drop shafts serve to overcome important elevation differences in drainage systems. If well designed, they are performant in terms of energy dissipation and safety. However, the standard design requires well-defined approach flow conditions to ensure the reliability of the structure. In practice, these conditions are frequently ignored due to space restrictions and the fact that several inflow branches may arrive at various elevations with supercritical and/or subcritical flows. The literature provides preliminary concepts for such situations that were not adaptable to the case discussed herein. Nevertheless, in order to apply a standard vortex drop shaft, a novel concept was developed that comprises a junction chamber to merge the inflow branches followed by a very short and steep inlet channel. Extended physical model tests have proven its feasibility. The hydraulic aspects discussed herein allow, at least partially, the adoption of the presented concept in similar situations.
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Acknowledgments
The authors thank the representatives of the town of Cossonay for the mandate and the excellent collaboration. Further, we acknowledge Mr. Cédric Bron, Mrs. Mélanie Baehler, Mrs. Irene Almeida Samora, Mr. Stéphane Terrier, and Mr. David Dorthe for their work related to the present study.
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Published In
Journal of Hydraulic Engineering
Volume 144 • Issue 11 • November 2018
Copyright
©2018 American Society of Civil Engineers.
History
Received: Jan 26, 2018
Accepted: May 15, 2018
Published online: Sep 10, 2018
Published in print: Nov 1, 2018
Discussion open until: Feb 10, 2019
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