A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Velocity Fields at Horizontal Bar Racks as Fish Guidance Structures
Horizontal bar racks used as fish protection measures at hydropower plants have rapidly gained importance in recent years. Despite the large number of installed racks in Europe, systematic investigations of the hydraulic losses and velocity fields were missing. To fill these research gaps, the hydraulic performance of horizontal bar racks was systematically investigated in a laboratory flume for a large number of rack parameters and different hydropower plant layouts. The results of the head loss assessment are published in a paper entitled Head Losses of Horizontal Bar Racks as Fish Guidance Structures, whereas the present paper focuses on the velocity fields. The measurements show that the bar shape, the horizontal approach flow angle, and the clear bar spacing have only a minor effect on the velocity fields. In contrast, bottom and top overlays might enhance the fish guidance efficiency for bottom and surface oriented fish, while the asymmetric downstream velocity field can reduce turbine efficiencies. The hydropower plant layout strongly affects the approach flow field to horizontal bar racks. For block-type hydropower plants, the installation of a dividing pier or partial opening of the spillways improves the flow field for better fish guidance.
Velocity Fields at Horizontal Bar Racks as Fish Guidance Structures
Horizontal bar racks used as fish protection measures at hydropower plants have rapidly gained importance in recent years. Despite the large number of installed racks in Europe, systematic investigations of the hydraulic losses and velocity fields were missing. To fill these research gaps, the hydraulic performance of horizontal bar racks was systematically investigated in a laboratory flume for a large number of rack parameters and different hydropower plant layouts. The results of the head loss assessment are published in a paper entitled Head Losses of Horizontal Bar Racks as Fish Guidance Structures, whereas the present paper focuses on the velocity fields. The measurements show that the bar shape, the horizontal approach flow angle, and the clear bar spacing have only a minor effect on the velocity fields. In contrast, bottom and top overlays might enhance the fish guidance efficiency for bottom and surface oriented fish, while the asymmetric downstream velocity field can reduce turbine efficiencies. The hydropower plant layout strongly affects the approach flow field to horizontal bar racks. For block-type hydropower plants, the installation of a dividing pier or partial opening of the spillways improves the flow field for better fish guidance.
Velocity Fields at Horizontal Bar Racks as Fish Guidance Structures
Julian Meister (author) / Helge Fuchs (author) / Claudia Beck (author) / Ismail Albayrak (author) / Robert M. Boes (author)
2020
Article (Journal)
Electronic Resource
Unknown
Metadata by DOAJ is licensed under CC BY-SA 1.0
HYDRAULICS OF HORIZONTAL BAR RACKS FOR FISH DOWNSTREAM MIGRATION
| TIBKAT | 2020
Experimental study of fish-friendly angled bar racks with horizontal bars
| Taylor & Francis Verlag | 2022
Assessing Guidance Efficiency of Angled Bar Racks and Louvers
| British Library Online Contents | 2002
An experimental investigation on fish guidance structures with horizontal bars
| Taylor & Francis Verlag | 2020