Hydraulics of stepped chutes: The transition flow

Chanson, Hubert; Toombes, Luke

doi:10.1080/00221686.2004.9641182

Cited by 89 publications

(59 citation statements)

References 7 publications

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“…2A). The observations highlighted some large turbulent fluctuations as reported in earlier studies Yasuda 1997, Chanson andToombes 2004). For the largest flow rates (1.69 < d c /h), a skimming flow regime took place.…”

supporting

confidence: 64%

Air–water flow measurements in a flat slope pooled stepped waterway

Felder

Chanson

2013

Can. J. Civ. Eng.

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supporting

confidence: 64%

Air–water flow measurements in a flat slope pooled stepped waterway

Felder

Chanson

2013

Can. J. Civ. Eng.

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“…For a range of intermediate discharges (0.5 < d c /h < 0.9), the flow was characterised by strong hydrodynamic instabilities associated with a well developed spray region and a large amount of splashes. The step cavities were almost completely full, with a small air pocket under the step edge, while for larger discharges the cavities became filled with water (Chanson and Toombes 2004). For the larger discharges (d c /h > 0.9), the flow skimmed as a coherent stream above the pseudo-bottom formed by the step edges.…”

Section: Basic Flow Patternsmentioning

confidence: 84%

Air entrainment and energy dissipation on Gabion stepped weirs

Wüthrich¹,

Chanson²

2014

Hydraulic Structures and Society - Engineering Challenges and Extremes

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“…For these largest discharges (0.8 ≤ d c /h < 1), the flow regime was thought to be a transition flow regime (e.g. Chanson and Toombes, 2004). …”

Section: Presentationmentioning

confidence: 99%

Flow patterns in nappe flow regime down low gradient stepped chutes

Toombes

Wagner

Chanson

2008

Journal of Hydraulic Research

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Although modern gravity dam spillways include often steep chutes operating in skimming flow regime, succession of free-falling nappes (i.e. nappe flow regime) are more common on low gradient chutes and cascades, and this flow situation received little attention to date. New experiments were conducted in nappe flows without hydraulic jump in two large-size facilities with flat slopes. The flow on the stepped cascade displayed complex, three-dimensional patterns. Detailed air-water flow measurements were performed in the jet, at nappe impact and in the downstream flow region. Key results demonstrated that the flow on each step was rapidly varied, highly three-dimensional and strongly aerated. RÉSUMÉBien que les déversoirs modernes de barrage poids incluent souvent des pentes raides fonctionnant en régime écumant, les successions de nappes en chute libre (i.e. régime d'écoulement en nappe) sont plus courantes sur les déversoirs et les cascades à pentes faibles, or cette forme d'écoulement n'a reçu que peu d'attention jusqu'ici. De nouvelles expériences ont été entreprises sur des écoulements en nappe sans ressaut hydraulique dans deux équipements de grande taille avec des pentes faibles. L'écoulement, sur une cascade en gradin présentait des configurations tridimensionnelles complexes. Des mesures détaillées de l'écoulement air-eau ont été effectuées dans le jet, à l'impact de la nappe et dans la zone d'écoulement aval. Les résultats principaux ont démontré que l'écoulement sur chaque marche était rapidement variable, largement tridimensionnel et fortement aéré.

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Hydraulics of stepped chutes: The transition flow

Cited by 89 publications

References 7 publications

Air–water flow measurements in a flat slope pooled stepped waterway

Air–water flow measurements in a flat slope pooled stepped waterway

Air entrainment and energy dissipation on Gabion stepped weirs

Flow patterns in nappe flow regime down low gradient stepped chutes

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