Improving Energy Dissipation of a Spillway with Structural Modifications

Document identifier:
Access full text here:10.3850/38WC092019-0222
Keyword: Engineering and Technology, Mechanical Engineering, Fluid Mechanics and Acoustics, Teknik och teknologier, Maskinteknik, Strömningsmekanik och akustik, Rusfors spillway, Design flood, Upgrade, Energy dissipation, Model tests, CFD, Strömningslära, Fluid Mechanics
Publication year: 2019
Relevant Sustainable Development Goals (SDGs):
SDG 11 Sustainable cities and communitiesSDG 6 Clean water and sanitation
The SDG label(s) above have been assigned by


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.


Penghua Teng

Resources, Energy & Infrastructure, Royal Institute of Technology, 10044 Stockholm, Sweden
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James Yang

Concrete Structures, Royal Institute of Technology, 10044 Stockholm, Sweden. Vattenfall AB, R&D Hydraulic Laboratory, 81426 Älvkarleby, Sweden.
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Qiancheng Xie

Luleå tekniska universitet; Strömningslära och experimentell mekanik
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