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
Journal name 6th International Symposium on Hydraulic Structures: Hydraulic Structures and Water System Management, ISHS 2016
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
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Created: Tue, 19 Jul 2016, 06:55:29 EST by Hubert Chanson on behalf of School of Civil Engineering