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Modification of vortex structures in fishways by cylinder adjunction

David, Laurent and Mehel, Amine and Tarrade, Laurent and Texier, Alain and Larinier, Michel Modification of vortex structures in fishways by cylinder adjunction. (2009) In: 13th International Symposium on Flow Visualization - ISFV13, 1 July 2008 - 4 July 2008 (Nice, France).

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Abstract

The improvement of devices that allow the upstream migration of fishes through engineering constructions or natural obstructions in rivers is now a real priority to maintain the biodiversity. Vertical slot fishways are commonly used and are very effective in ensuring unhindered passage of the species of large size fishes [1]. The flows within these hydraulic structures are turbulent [2] and present unsteady vortex dynamic in relation to the geometric parameters of the pools (slopes, flow discharges and pool widths). The modes of locomotion of the fish depend to the species and are the object of several recent studies [3]. The fishes use the fluid motion generated inside the pools to the propulsion and to move easily upstream in the fishway. Nerveless the species with small sizes have some difficulties to upstream migrate because the kinematic energy and the velocity are too large for them. An experimental study is undertaken to characterize the turbulent flow for various configurations of vertical slot fishways and to determine how their characteristics might be modified in order to facilitate the passage of small species. Particle Image Velocimetry is achieved to analyze the effects of vertical cylinders within the pools on the dimensions of recirculation zones and the turbulence intensity. Mean velocity and fluctuation measurements inside a pool with and without cylinder are compared. The unsteady behaviours and the vortex flapping are examined.

Item Type:Conference or Workshop Item (Paper)
Additional Information:The original publication is available in : 13th International Symposium on Flow Visualization and 12th French Congress on Visualization in Fluid Mechanics 2008 (ISFV13/FLUVISU 12). - Curran Associates, 2009. - 4 vol. (2425 p.) . - ISBN 978-1-61567-100-7
HAL Id:hal-00990090
Audience (conference):International conference proceedings
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Other partners > Ecole Nationale Supérieure de Mécanique et d'Aérotechnique - ENSMA (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
Other partners > Université de Poitiers (FRANCE)
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Deposited By: Dominique COURRET
Deposited On:08 Apr 2014 10:10

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