Start Date
2018 5:40 PM
Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 License.
Recommended Citation
Ballu, A. (2018). Influence of Macro-Roughnesses on Vertical Slot Fishways. Daniel Bung, Blake Tullis, 7th IAHR International Symposium on Hydraulic Structures, Aachen, Germany, 15-18 May. doi: 10.15142/T39S7Q (978-0-692-13277-7).
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.
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.