Author(s): A. Ballu; G. Pineau; D. Calluaud; L. David

Linked Author(s): Gérard PINEAU, Damien Calluaud, Laurent David

Keywords: Upstream migration; Flow topology; Roughnesses; Vertical slot fishway; Numerical simulation

Abstract:

To restore the ecological continuity of European rivers and streams, and, more specifically, the unrestricted movement of aquatic species vertical slot fishways (VSF) are built and offer the possibility for fish to cross dams or weirs. Initially, such devices were constructed to allow the migration of fish species with high swimming capacity like salmonids. Currently, more and more VSFs are equipped with macro-roughnesses fixed to the bed to help small or benthic species to cross obstructions. Macroroughnesses 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.

DOI: https://doi.org/10.15142/T39S7Q

Year: 2018