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Modification of vortex structures in fishways by cylinder adjunction

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.
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  • HAL Id : hal-00990090, version 1
  • OATAO : 11264

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Laurent David, Amine Mehel, Laurent Tarrade, Alain Texier, Michel Larinier. Modification of vortex structures in fishways by cylinder adjunction. 13th International Symposium on Flow Visualization - ISFV13, Jul 2008, Nice, France. pp. 1667-1676. ⟨hal-00990090⟩

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