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Improving Energy Dissipation of a Spillway with Structural Modifications
Resources, Energy & Infrastructure, Royal Institute of Technology, 10044 Stockholm, Sweden.
Concrete Structures, Royal Institute of Technology, 10044 Stockholm, Sweden. Vattenfall AB, R&D Hydraulic Laboratory, 81426 Älvkarleby, Sweden..
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Fluid and Experimental Mechanics.ORCID iD: 0000-0003-0820-617X
2019 (English)In: E-proceedings of the 38th IAHR World Congress, International Association for Hydro-Enviroment Engineering and Research (IAHR) , 2019, p. 2531-2538Conference paper, Published paper (Refereed)
Abstract [en]

The stilling basin of Rusfors spillway comprised a concrete frame with two supporting plates and a cover, which was probably constructed for timber floating but was not in use anymore. Abrasion damages occurred in the basin bottom due to the sediment carried by the bottom current. To safely discharge the updated design flood, removal of the structure was suggested to avoid further deterioration of the operation conditions. Physical model tests and CFD modelling were performed to help understand the flow behaviors in the basin. The studies show that, due to the concrete frame, strong surface currents prevail in the basin, with inefficient energy dissipation and accordingly large water-level fluctuations downstream. The supporting plates also lead to skewed bottom currents, which are the cause of the bottom damages. Together with the detruncation of the spillway crest, the removal of the frame results favorably in a typical hydraulic jump. As shown from both the physical and numbering modelling, the basin flow pattern and energy dissipation become satisfactory at the design flood.

Place, publisher, year, edition, pages
International Association for Hydro-Enviroment Engineering and Research (IAHR) , 2019. p. 2531-2538
Series
Proceedings of the IAHR World Congress, ISSN 2521-7119, E-ISSN 2521-716X
Keywords [en]
Rusfors spillway, Design flood, Upgrade, Energy dissipation, Model tests, CFD
National Category
Fluid Mechanics and Acoustics
Research subject
Fluid Mechanics
Identifiers
URN: urn:nbn:se:ltu:diva-76409DOI: 10.3850/38WC092019-0222Scopus ID: 2-s2.0-85084669194OAI: oai:DiVA.org:ltu-76409DiVA, id: diva2:1361552
Conference
38th IAHR World Congress, 1-6 September, 2019, Panama City, Panama
Available from: 2019-10-16 Created: 2019-10-16 Last updated: 2024-03-07Bibliographically approved

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Xie, Qiancheng

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