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Experimental study of fish-friendly angled bar racks with horizontal bars

Lemkecher, Fatma and Chatellier, Ludovic and Courret, Dominique and David, Laurent Experimental study of fish-friendly angled bar racks with horizontal bars. ( In Press: 2021) Journal of Hydraulic Research. ISSN 0022-1686

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Official URL: https://doi.org/10.1080/00221686.2021.1903587

Abstract

This paper deals with an experimental study of angled fish-friendly trash racks with horizontal bars, using a physical model in an open channel. Head losses are investigated for 2 bar shapes, 3 ratios between bar spacing and bar thickness and 4 rack’s angles of orientation. The Froude and bar-Reynolds numbers were respectively 0.275 and 3600. The head loss coefficients decrease as the blockage ratio and the angle of orientation of the rack decrease. They are well predicted by the formula produced by Raynal et al. (2013a) for inclined rack with some adaptations. Velocity fields are characterized upstream and downstream of the racks, showing no effect of the angle of orientation and no heterogeneity over channel width. Consequently, the normal and tangential components of the velocity along the rack are in agreement with the theoretical values given by angular decomposition. These results serve to assess the compliance with biological criteria to avoid impingement risks and guide fish towards a bypass.

Item Type:Article
HAL Id:hal-03272917
Audience (journal):International peer-reviewed journal
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 - Toulouse INP (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
Other partners > Université de Poitiers (FRANCE)
Other partners > Office français de la biodiversité - OFB (FRANCE)
Laboratory name:
Funders:
European Union’s Horizon 2020 research and innovation programme FITHydro under grant agreement No 727830
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Deposited On:28 Jun 2021 13:49

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