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Theses

Étude des grilles de prises d'eau ichtyocompatibles

Abstract : Hydropower plants restricts the fish migration in rivers. Thus, several devices have been installed in hydropower plants to facilitate fish passage. The bases for the design and sizing of these devices, called "fishfriendly water intakes", were defined in 2008 by Courret & Larinier based on feedback acquired in France and abroad. Hydraulic studies on a reduced model of trash rack, a component of the water intake, then confirmed certain criteria concerning the installation of trash racks and the design of the associated bypasses. They also led to produce head loss formulas adapted to the tested configurations in order to predict energy loss resulting to trash rack implementation in hydropower plants. This thesis explores new concepts of fishfriendly trash racks (rack placed at the inlet of the turbines to prevent fish passage) which minimize head losses for producers and which are suitable for downstream fish migration. First, an optimization of inclined trash racks is proposed with different bar shapes and the addition of the effect of the supports that maintains the trash racks. The flow upstream this type of racks is then studied in-situ in order to assess the effectiveness of the first fishfriendly trash racks installed in hydropower plants with numerical simulations carried out in parallel. Secondly, new physical barriers are studied. The angled trash racks with horizontal bars were tested and show a favorable guidance of the fish and a low head loss whose model is inclined trash racks one. The second new solution explored is the perforated plate, which has proven to be as effective as the inclined trash rack in terms of fish guidance with the advantage of minimizing further the head losses.
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Submitted on : Wednesday, June 9, 2021 - 2:21:08 PM
Last modification on : Thursday, June 10, 2021 - 3:32:08 AM

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2020-LEMKECHER-Fatma-These.pdf
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  • HAL Id : tel-03255290, version 1

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Fatma Lemkecher. Étude des grilles de prises d'eau ichtyocompatibles. Mécanique des fluides [physics.class-ph]. Université de Poitiers, 2020. Français. ⟨NNT : 2020POIT2275⟩. ⟨tel-03255290⟩

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