Air–-water flows and free-surface profiles on a non-uniform stepped chute

Felder, Stefan and Chanson, Hubert (2014) Air–-water flows and free-surface profiles on a non-uniform stepped chute. Journal of Hydraulic Research, 52 2: 253-263. doi:10.1080/00221686.2013.841780

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Author Felder, Stefan
Chanson, Hubert
Title Air–-water flows and free-surface profiles on a non-uniform stepped chute
Formatted title
Air–water flows and free-surface profiles on a non-uniform stepped chute
Journal name Journal of Hydraulic Research   Check publisher's open access policy
ISSN 0022-1686
Publication date 2014-01-01
Sub-type Article (original research)
DOI 10.1080/00221686.2013.841780
Open Access Status File (Author Post-print)
Volume 52
Issue 2
Start page 253
End page 263
Total pages 11
Place of publication Abingdon, Oxfordshire, United Kingdom
Publisher Taylor & Francis
Language eng
Formatted abstract
Comparative experiments were conducted between uniform and non-uniform stepped spillway profiles in a large-size laboratory facility. For each stepped configuration, the air concentration distributions matched the advective diffusion equation and the interfacial velocity was well correlated with a power law. A comparison of the air–water flow properties showed small differences in terms of number of entrained air bubbles, chord sizes and turbulence characteristics between the different configurations. For the non-uniform steps, larger flow instabilities and stronger variation in the air–water flow properties were observed. Further some non-intrusive measurements were performed with acoustic displacement metres to characterize the free-surface profiles, free-surface fluctuations and free-surface wave celerity in both non-aerated and aerated flow regions. The experiments highlighted a close agreement between experimental data and theoretical predictions in the non-aerated flows and with conductivity probe data in the aerated flows. The non-intrusive technique was suitable for measuring the free-surface characteristics on stepped chutes, especially in the non-aerated flow region.
Keyword Air-water flows
Free-surface profiles
Non-uniform steps
Physical modelling
Stepped spillways
Air entrainment
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Civil Engineering Publications
Official 2015 Collection
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Citation counts: TR Web of Science Citation Count  Cited 4 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 5 times in Scopus Article | Citations
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Created: Fri, 09 May 2014, 15:13:43 EST by Hubert Chanson on behalf of School of Civil Engineering