Hydraulic performance of fish guidance structures with curved bars – Part 1: head loss assessment
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Date
2020
Publication Type
Journal Article
ETH Bibliography
yes
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Abstract
The hydraulic performance of fish guidance structures such as louvres and angled bar racks is an important design criterion to achieve high fish guidance efficiencies with a minimum impact on hydropower production. The current geometrical designs of such structures result in high head losses and asymmetric turbine admission flow and hence need to be optimized. We therefore developed an innovative curved bar design for fish guidance structures and experimentally investigated different rack configurations in a laboratory flume. The present paper (Part I) focuses on the hydraulic performance of the novel curved-bar racks with regard to head losses, while in the companion paper (Part II) we report the results on the flow fields. The effects of the main rack angle, bar angle, bar spacing, bar depth, and top or/and bottom overlays were systematically studied. The curved bar shape leads to significantly lower head losses compared to straight bar shapes. An existing head loss prediction formula was extended to account for the new bar shape and the application of overlays.
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Publication status
published
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Book title
Journal / series
Volume
58 (5)
Pages / Article No.
807 - 818
Publisher
Taylor & Francis
Event
Edition / version
Methods
Software
Geographic location
Date collected
Date created
Subject
Curved-bar rack; Downstream fish migration; Fish guidance; Fish protection; Head loss; Louvre
Organisational unit
03820 - Boes, Robert / Boes, Robert
Notes
Funding
727830 - Fishfriendly Innovative Technologies for Hydropower (SBFI)
Related publications and datasets
Is part of: https://doi.org/10.3929/ethz-b-000387342