Start Date

2018 5:40 PM

Creative Commons License

Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 License.

Abstract

To restore the ecological continuity of European rivers and streams and more specifically the free circulation of aquatic species, vertical slot fishways (VSF) are built to offer the possibility for fish to cross dams or weirs. Initially, such devices were constructed to allow the migration of fish species with an important swimming capacity like salmonids. Currently, more and more VSFs are equipped with macro-roughnesses fixed on their bed to help small or benthic species to cross obstructions. Macro-roughnesses are most often stones or concrete cylinders and have been introduced to decrease the velocity and the turbulent kinetic energy of the flow inside pools. In this paper, unsteady 3D flow simulations are carried out to study the effects of such macro-roughnesses on the flows. LES simulations, validated in a previous paper with experimental results, provide valuable information of the flow characteristics.

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May 17th, 5:40 PM

Influence of Macro-Roughnesses on Vertical Slot Fishways

To restore the ecological continuity of European rivers and streams and more specifically the free circulation of aquatic species, vertical slot fishways (VSF) are built to offer the possibility for fish to cross dams or weirs. Initially, such devices were constructed to allow the migration of fish species with an important swimming capacity like salmonids. Currently, more and more VSFs are equipped with macro-roughnesses fixed on their bed to help small or benthic species to cross obstructions. Macro-roughnesses are most often stones or concrete cylinders and have been introduced to decrease the velocity and the turbulent kinetic energy of the flow inside pools. In this paper, unsteady 3D flow simulations are carried out to study the effects of such macro-roughnesses on the flows. LES simulations, validated in a previous paper with experimental results, provide valuable information of the flow characteristics.