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Three-Dimensional Particle Tracking Velocimetry Investigation of Flow Dynamics Around Simplified Stones at Low Submergence: Implications for Instream Habitat
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Fluid and Experimental Mechanics.ORCID iD: 0009-0001-2876-4841
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Fluid and Experimental Mechanics.ORCID iD: 0000-0001-9789-6293
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Fluid and Experimental Mechanics.ORCID iD: 0000-0002-4916-9566
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Fluid and Experimental Mechanics.ORCID iD: 0000-0001-9426-2375
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2025 (English)In: Water, E-ISSN 2073-4441, Vol. 17, no 2, article id 217Article in journal (Refereed) Published
Abstract [en]

Shallow waterways such as rapids, tributaries and smaller streams can have important ecological functions in both free-flowing and regulated rivers. As more intermittent renewable energy is introduced to the energy system to reduce CO2 emissions, the operational conditions of hydropower plants are changing. This implies various flow scenarios that can lead to more locations with shallow depths and larger variations in water levels and velocities, resulting in increased impact on the riverine ecosystem. Accurate predictions of these impacts require an understanding of the flow dynamics near large roughness elements such as boulders or trees in shallow river regions. This study uniquely investigates the effect of relative submergence, i.e., water depth relative to boulder size, on the flow field, turbulence, and potential fish habitats around idealized stone shapes (hemispheres) in shallow open channel flow using time-resolved 3D particle tracking velocimetry. The results indicate that varying relative submergence significantly affects recirculation zones, velocity and vorticity distribution, as well as turbulent kinetic energy. Notably, larger regions of lower velocity downstream of the roughness elements were generated at lower submergences, which might be favorable for fish energy conservation. Valuable insights into ecohydraulic engineering and habitat restoration in shallow waterways can be gained by understanding the fundamental flow mechanisms at low submergence for the flow around large roughness elements.

Place, publisher, year, edition, pages
MDPI, 2025. Vol. 17, no 2, article id 217
Keywords [en]
volumetric PTV, low submergence, shallow flow, simplified stones, fish habitat
National Category
Fluid Mechanics
Research subject
Fluid Mechanics
Identifiers
URN: urn:nbn:se:ltu:diva-111302DOI: 10.3390/w17020217OAI: oai:DiVA.org:ltu-111302DiVA, id: diva2:1928029
Projects
Swedish Centre for Sustainable Hydropower-SVC
Note

Validerad;2025;Nivå 2;2025-01-16 (hanlid);

Funder: Swedish Centre for Sustainable Hydropower - SVC

Full text license: CC BY 4.0

Available from: 2025-01-16 Created: 2025-01-16 Last updated: 2025-01-16Bibliographically approved

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Nilsson, Dan A.Andersson, Anders G.Larsson, I.A. SofiaAndersson, RobinBillstein, Mats

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