Turbulence and energy dissipation in the developing non-aerated and the fully-developed aerated flows on a stepped spillway

Zhang, G. and Chanson, H. (2016). Turbulence and energy dissipation in the developing non-aerated and the fully-developed aerated flows on a stepped spillway. In: Brian Crookston and Blake Tullis, Hydraulic Structures and Water System Management. 6th IAHR International Symposium on Hydraulic Structures. IAHR International Symposium on Hydraulic Structures, Portland, OR, United States, (12-21). 27-30 June 2016. doi:10.15142/T3640628160853

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Author Zhang, G.
Chanson, H.
Title of paper Turbulence and energy dissipation in the developing non-aerated and the fully-developed aerated flows on a stepped spillway
Conference name IAHR International Symposium on Hydraulic Structures
Conference location Portland, OR, United States
Conference dates 27-30 June 2016
Proceedings title Hydraulic Structures and Water System Management. 6th IAHR International Symposium on Hydraulic Structures
Place of Publication Logan, UT, United States
Publisher Utah State University
Publication Year 2016
Sub-type Fully published paper
DOI 10.15142/T3640628160853
Open Access Status DOI
ISBN 9781884575754
Editor Brian Crookston
Blake Tullis
Start page 12
End page 21
Total pages 10
Collection year 2017
Language eng
Abstract/Summary Stepped spillways are characterised by highly turbulent air-water flows and a large rate of energy dissipation compared to smooth chutes. Herein, detailed measurements were performed in both the developing non-aerated and fully-developed air-water flow regions on a large 1V:1H stepped spillway model. In the developing flow region, large total pressure fluctuations and turbulence intensities were recorded next to the pseudo-bottom. Downstream of the inception point, large total pressure fluctuations were recorded, which were mainly induced by density fluctuations. The water turbulence intensities in the air-water flow region did not differ significantly from those in the developing flow region. The steps generated significant form loss, amounting to about 50% of the upstream total energy regardless of discharge. Similar rates of energy dissipation and friction factors were found between the developing non-aerated and fully-developed air-water flow regions. The energy dissipation on stepped chutes was found to be sensitive to the chute slope and relatively little affected by the air-bubble diffusion.
Keyword Stepped spillways
Air bubble entrainment
Turbulence
Total pressure
Energy dissipation
Steep chute flows
Physical modelling
Q-Index Code E1
Q-Index Status Provisional Code
Institutional Status UQ
Additional Notes Open access publication. Full details: ZHANG, G., and CHANSON, H. (2016)."Turbulence and Energy Dissipation in the Developing Non-Aerated and the Fully-Developed Aerated Flows on a Stepped Spillway." Proceedings of 6th IAHR International Symposium on Hydraulic Structures, Hydraulic Structures and Water System Management, B. CROOKSTON & B. TULLIS Editors, 27-30 June, Portland OR, USA, pp. 12-21 (DOI: 10.15142/T3640628160853) (ISBN 978-1-884575-75-4).

Document type: Conference Paper
Collections: School of Civil Engineering Publications
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Created: Tue, 19 Jul 2016, 06:55:29 EST by Hubert Chanson on behalf of School of Civil Engineering