Journal article
Downstream fish swimming corridors of a dam by three-dimensional numerical models: assessment with RANS and DDES schemes
Journal of ecohydraulics
08/08/2025
DOI: 10.1080/24705357.2025.2542885
PMID: 39757559
Abstract
Hydropower offers a renewable energy pathway, but hydrodynamic forces near dams pose various risks to fish movement. Three-dimensional numerical models using Reynolds-Averaged Navier–Stokes (RANS) are widely used to identify swimming corridors. However, they often focus only on velocity, and the accurate fish movement prediction depend on understanding the influence of other hydraulic factors. This study aimed to compare the flow in the 3 km reach downstream of a dam using different models (RANS and Delayed Detached Eddy Simulation - DDES) and the models’ ability to define fish swimming corridors. Our results showed significant differences in the predicted velocity and turbulence between the models, with turbulence exhibiting greater variation. Both models identified similar swimming corridors based on flow velocity and a neotropical swimming capacity. However, for turbulence preferences, the models diverged. As turbulence modelling has grown more accessible computationally, the DDES approach appears promising to understand the movement of fish in a holistic way in flows affected by hydroelectric dams.
Details
- Title: Subtitle
- Downstream fish swimming corridors of a dam by three-dimensional numerical models: assessment with RANS and DDES schemes
- Creators
- Ludmila Moura Moreira MendesHersília de Andrade e SantosMarcela Politano - U.S. Army Engineer Research and Development Center
- Resource Type
- Journal article
- Publication Details
- Journal of ecohydraulics
- DOI
- 10.1080/24705357.2025.2542885
- PMID
- 39757559
- NLM abbreviation
- J Ecohydraul
- ISSN
- 2470-5357
- eISSN
- 2470-5365
- Publisher
- TAYLOR & FRANCIS LTD
- Number of pages
- 16
- Grant note
- Centro Federal de Educacao Tecnologica de Minas Gerais (CEFET-MG)Conselho Nacional de Desenvolvimento Cientimath;fico e Tecnologico (CNPQ): 456390/2014-6 Coordenacao de Aperfeicoamento de Pessoal de Nimath;vel Superior-Brasil (CAPES): 001
This work was supported by Centro Federal de Educacao Tecnologica de Minas Gerais (CEFET-MG); Conselho Nacional de Desenvolvimento Cient & imath;fico e Tecnologico (CNPQ) through the Projeto Universal (456390/2014-6); This study was financed in part by the Coordenacao de Aperfeicoamento de Pessoal de N & imath;vel Superior-Brasil (CAPES)-Finance Code 001.
- Language
- English
- Electronic publication date
- 08/08/2025
- Academic Unit
- IIHR--Hydroscience and Engineering
- Record Identifier
- 9984946845002771
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