Fish Swimming Behavior and Bypass Acceptance at Curved-Bar Rack Bypass Systems ...

The present study deals with the hydraulic and fish-biological performance of an innovative curved-bar rack bypass system (CBR-BS). CBR is a mechanical behavioral fish guidance structure typically combined with a BS, that was developed at VAW of ETH Zurich for safe downstream fish passage at hydropo...

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Bibliographic Details
Main Authors: Beck, Claudia, Albayrak, Ismail, Meister, Julian, Peter, Armin, Selz, Oliver M., Leuch, Claudia, Vetsch, David F., Boes, Robert
Format: Text
Language:English
Published: ETH Zurich 2022
Subjects:
fish migration
salmon
Fish protection and guidance
Curved-bar rack
Bypass system
hydropower plant
infoeu-repo/classification/ddc/624
Civil engineering
FOS Civil engineering
Atlantic salmon
European eel
Online Access:https://dx.doi.org/10.3929/ethz-b-000560944
http://hdl.handle.net/20.500.11850/560944
Description
Summary:The present study deals with the hydraulic and fish-biological performance of an innovative curved-bar rack bypass system (CBR-BS). CBR is a mechanical behavioral fish guidance structure typically combined with a BS, that was developed at VAW of ETH Zurich for safe downstream fish passage at hydropower plants. A hydraulically optimized CBR with a full-depth BS was tested with six European fish species, namely, spirlin, nase, barbel, Atlantic salmon parr, brown trout and European eel in an ethohydraulic laboratory flume. The approach flow velocities were 0.50 and 0.70 m/s and the velocity ratios (VR) of mean bypass inlet velocity to mean approach flow velocity were 1.2 and 1.4 for each flow velocity, resulting in four different hydraulic conditions. The flow field around the CBR-BS was numerically simulated for each hydraulic condition with a CFD model. The simulation results show that the velocity gradients between the curved bars and up to ~40 mm upstream from the rack are high. The live-fish tests showed ... : Proceedings 39th IAHR World Congress ...

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