Author(s): Nicolas Riviere; Anne-Gaelle Laily; Anuel Mignot; Delphine Doppler
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Keywords: No Keywords
Abstract: This paper presents an experimental study of the interaction between a supercritical, uniform turbulent, open channel flow and a fixed, emerged rectangular obstacle. The two main structures located upstream from the obstacle in such flows are a detached hydraulic jump and a horseshoe vortex. Their positions are assessed using photographs and oil flow visualizations. A laser grid projection technique is developed to provide water depth maps around the obstacle. This obstacle can be on contact with the channel bed or slightly above. It allows studying the influences on the flow of both the obstacle width and the gap below the obstacle. Compared to existing literature, present work assesses the existence of a new flow type–the so-called “coincident” type–where the toes of the hydraulic jump and of the horseshoe vortex are located at the same distance from the obstacle.
Year: 2012