Form Drag Resistance of Two Dimensional Stepped Steep Open Channels

Noori, Bahzad M. A.

doi:10.1007/978-3-662-11300-4_11

Cited by 8 publications

(2 citation statements)

References 8 publications

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“…4b presents the data obtained with flat chutes (i.e. a < 12 degrees) and indicates a good agreement between data obtained on model (Noori 1984) and on prototype (Grinchuk et al 1977). The results show also an increase of the friction factor with the relative roughness that appears to be independent of the channel slope.…”

Section: W 4 Assupporting

confidence: 69%

Hydraulics of skimming flows over stepped channels and spillways

Chanson

1994

Journal of Hydraulic Research

160

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Section: W 4 Assupporting

confidence: 69%

Hydraulics of skimming flows over stepped channels and spillways

Chanson

1994

Journal of Hydraulic Research

160

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“…Two flow regimes, nappe and skimming, have been identified in stepped spillways [ Noori , 1984; Chanson , 1994; Chamani and Rajaratnam , 1999]. Similarly, at the channel unit scale, two broad regimes have been described for flows at single drop structures [ Ohtsu and Yasuda , 1997; Wu and Rajaratnam , 1998] in which the flow dynamics parallel the transition between rollers and undular jumps [ Chanson and Montes , 1995; Ohtsu et al , 2001; Comiti and Lenzi , 2006].…”

Section: Introductionmentioning

confidence: 99%

Flow regimes, bed morphology, and flow resistance in self‐formed step‐pool channels

Comiti

Cadol

Wohl

2009

Water Resources Research

132

184

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[1] We used a mobile bed flume with scaled grain size distribution, channel geometry, and flow to examine morphology and hydraulics of stepped channels. We hypothesized that (1) step geometry and flow resistance differs significantly as a function of the range of grain sizes present, (2) a transition from nappe to skimming flow occurs in stepped channels with mobile beds for conditions similar to stepped spillways, and (3) the partitioning of flow resistance changes significantly when flow passes from nappe to skimming conditions. Results support each of these hypotheses and help to illuminate the complexity of V-Q relationships in stepped channels, in which a dramatic decrease in flow resistance and increase in velocity accompany the transition from nappe to skimming flow near step-forming events. Therefore, a single flow resistance equation applicable to both ordinary and large floods may not be ideal in stepped channels. Nonetheless, models based on dimensionless velocity and unit discharge appear more robust compared to those based on the Darcy-Weisbach friction factor.

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Discussion of “Energy Dissipation on Stepped Spillways” by P. Veerabhadra Rao

Rao¹

1995

J. Hydraul. Eng.

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Form Drag Resistance of Two Dimensional Stepped Steep Open Channels

Cited by 8 publications

References 8 publications

Hydraulics of skimming flows over stepped channels and spillways

Hydraulics of skimming flows over stepped channels and spillways

Flow regimes, bed morphology, and flow resistance in self‐formed step‐pool channels

Discussion of “Energy Dissipation on Stepped Spillways” by P. Veerabhadra Rao

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