Emerging Obstacles in Supercritical Open-Channel Flows: Detached Hydraulic Jump versus Wall-Jet-Like Bow Wave
Publication: Journal of Hydraulic Engineering
Volume 143, Issue 7
Abstract
A supercritical open-channel flow can skirt an emerged obstacle by using two distinct forms of workaround: a detached hydraulic jump or a so-called wall-jet-like bow wave. These two forms stem from the properties of supercritical flow and are described in detail. Experiments assess the conditions of appearance of one form or the other, depending on both upstream Froude number and flow-depth to obstacle-width ratio. A conceptual model, based on mass conservation, reproduces and explains the corresponding transition. For the wall-jet-like bow wave, additional information is given regarding water-depth oscillations; the associated Strouhal number show they are caused by reverse spillage on the obstacle face. Implications of the present results on scouring and forces exerted by the flow on structures justify future works on the subject.
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Acknowledgments
Authors thank S. Roux (CNR, Lyon, France) and F. Fruchart (Easy Hydro, France) for fruitful discussions about the field case of La Rivière des Galets, Ile de la Réunion, France. Authors are indebted to the Direction de l’Environnement, de l’Aménagement et du Logement de la Réunion (DEAL 974), concerning the photograph in Fig. 1.
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Published In
Journal of Hydraulic Engineering
Volume 143 • Issue 7 • July 2017
Copyright
©2017 American Society of Civil Engineers.
History
Received: Dec 22, 2015
Accepted: Oct 14, 2016
Published online: Feb 22, 2017
Published in print: Jul 1, 2017
Discussion open until: Jul 22, 2017
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