Author(s): Ana L. Quaresma; Filipe Romao; Paulo Branco; Maria Teresa Ferreira; Antonio N. Pinheiro
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Abstract: Providing suitable hydraulic conditions in fishways for native freshwater species with different morphological and ecological characteristics is vital for re-establishing river longitudinal connectivity. Accomplishing this using as less water as possible without compromising its effectiveness is very important in water scarcity regions. 3D-CFD modelling was used to compare the hydrodynamics of two widely used vertical slot fishway (VSF) configurations and of a variant of the recently developed multi-slot fishway (MSF) configuration, which needs a lower discharge to operate, while keeping similar flow depths. This study highlighted the value of CFD as a tool for fishway design, as new configurations or different solutions for retrofitting existing non-operational fishways can be modelled and optimized, in shorter periods and in a less expensive way. It also showed that MSF may be an effective and adequate option for multiple fish species, especially in water scarcity regions.
Year: 2018