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Evaluation of Pool-Type Fish Passage with Labyrinth Weirs
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Concrete Structures.ORCID iD: 0000-0002-5239-6559
KTH, School of Architecture and the Built Environment (ABE), Sustainable development, Environmental science and Engineering, Resources, Energy and Infrastructure. Vattenfall AB, R&D Hydraul Lab, S-81426 Alvkarleby, Sweden..ORCID iD: 0000-0002-4242-3824
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Concrete Structures.ORCID iD: 0000-0001-8336-1247
2022 (English)In: Sustainability, E-ISSN 2071-1050, Vol. 14, no 3, article id 1098Article in journal (Refereed) Published
Abstract [en]

Due to the construction of dams and sluices, habitat fragmentation of riverine species is an issue of concern in hydropower projects. An artificial fishway aims to restore flow connectivity and facilitate migration. As an alternative to the conventional layout with straight walls, labyrinth layouts are introduced, consisting of either triangular, trapezoidal, or rectangular weirs. Three-dimensional CFD simulations are performed to examine their influences on the fishway hydraulics. The labyrinth layouts exhibit an appreciable three-dimensional flow structure in a pool, featuring flow fluctuations in both cross- and along-channel directions, which is indicative of the potential for multiple species with distinct swimming preferences. The streamwise reduction in mean flow velocity is correlated with the Froude number, with the labyrinth weirs leading to a somewhat lower reduction than the conventional one. The dimensionless pool water depth declines with specific flow discharge. The turbulence kinetic energy is the lowest in the triangular layout and the vorticity in the conventional one. Among the labyrinth layouts, the differences in volumetric power dissipation are small. An equation is developed for dissipation estimation. All the labyrinth layouts generate higher energy loss than the conventional one. With optional weir configurations, the findings provide reference for engineering design.

Place, publisher, year, edition, pages
MDPI AG , 2022. Vol. 14, no 3, article id 1098
Keywords [en]
fishway, straight weir, labyrinth weir, flow pattern, CFD
National Category
Energy Engineering Geotechnical Engineering and Engineering Geology Fluid Mechanics
Identifiers
URN: urn:nbn:se:kth:diva-309794DOI: 10.3390/su14031098ISI: 000756083800001Scopus ID: 2-s2.0-85123090246OAI: oai:DiVA.org:kth-309794DiVA, id: diva2:1644688
Note

QC 20220315

Available from: 2022-03-15 Created: 2022-03-15 Last updated: 2025-02-09Bibliographically approved

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Li, ShichengYang, JamesAnsell, Anders

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