Stepped spillways for embankment dams. Review, progress and development in overflow hydraulics

Chanson, Hubert; Gonzalez, Carlos A.

doi:10.1201/b16994-40

Cited by 9 publications

(6 citation statements)

References 9 publications

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“…3 allows for a comparison between different configurations over the same model to give the most efficient, namely the current study. For short spillways, a model/prototype study should be carried out to a scale not more than 1:10 and preferably less than 1:5, as recommended by, for example, Chanson and Gonzalez (2004). Figure 4 compares the results of André et al (2004), Chinnarasri and Wongwises (2006), and this study relative to those obtained for sills at the step edges, with h * = b/h as the sill-to-step height.…”

Section: Comparison With Classical Stepped Spillwaysmentioning

confidence: 96%

“…All trend lines are of the same type. Table 3 presents the coefficients a , b , and c to ±10% for comparable inlet conditions (ogee inlet), scale factor (of not more than 1:5 (Chanson and Gonzalez 2004)), discharge range (0.4 < y c /h < 2.5), relative spillway height range (4.0 < H T /y c < 30.0), and chute angle (α = 45 • ). A complete prototype/model study is preferable and required for any anticipated spillway.…”

Section: Effect Of Shifting Baffles or Sillsmentioning

confidence: 99%

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Energy dissipation and flow characteristics of baffles and sills on stepped spillways

Zare

Doering

2012

Journal of Hydraulic Research

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In this study, a two-dimensional physical model was used to evaluate the effectiveness of adding baffles and sills at step edges or of shifting them from step edges of a 1V:1H sloping, short, sharp-or round-crested stepped spillway with an ogee inlet. A comparison between different configurations of baffles and sills was carried out with respect to the energy dissipation and the flow characteristics. The baffle-shifted round-crested spillway gives the smallest discharge required for the onset of a skimming flow among all other configurations. The baffle-edged chute dissipates more energy than the sill-edged spillway. Shifting baffles or sills from the sharp edges decreases the energy dissipation. Shifting baffles or sills from the round-crested spillway increases the energy dissipation in the range of the discharges studied. Empirical equations for energy dissipation are introduced for practical application of spillways of comparable similar conditions.

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Section: Comparison With Classical Stepped Spillwaysmentioning

confidence: 96%

Section: Effect Of Shifting Baffles or Sillsmentioning

confidence: 99%

Energy dissipation and flow characteristics of baffles and sills on stepped spillways

Zare

Doering

2012

Journal of Hydraulic Research

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“…The discussers hypothesize that some maximum in flow resistance must be related to some kind of flow instability. The three-dimensional nature of recirculating vortices is believed to play a role to further the rate of energy dissipation ͑André et al Chanson and Gonzalez 2004͒. The discussers demonstrated quantitatively the means to enhance the flow resistance with turbulence manipulation ͑Chanson and Gonzalez 2004͒.…”

Section: ͑2͒mentioning

confidence: 99%

Flow Characteristics of Skimming Flows in Stepped Channels

2004

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“…1). Energy dissipation in stepped chutes can be enhanced by superposing small and large steps, incorporating occasional large drops among small steps, or by using V-shaped step edges [11]. All these techniques may effectively dissipate the flow energy, but their attractiveness is counterbalanced by the needs of extraordinary placement methods for structural integrity.…”

Section: Introductionmentioning

confidence: 99%

Turbulence manipulation in air–water flows on a stepped chute: An experimental study

Gonzalez

Chanson

2008

European Journal of Mechanics - B/Fluids

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In a stepped channel operating with large flow rates, the flow skims over the pseudo-bottom formed by the step edges as a coherent stream. Intense three-dimensional recirculation is maintained by shear stress transmission from the mainstream to the step cavities, while significant free-surface aeration takes place. The interactions between free-surface aeration and cavity recirculation are investigated herein with seven step cavity configurations. The experiments were conducted in a large stepped channel operating at large Reynolds numbers. For some experiments, triangular vanes, or longitudinal ribs, were placed across the step cavities to manipulate the flow turbulence to enhance the interactions between the mainstream flow and the cavity recirculation region. The results showed a strong influence of the vanes on the air-water flow properties in both free-stream and cavity flows. The findings demonstrate some passive turbulence manipulation in highly turbulent air-water flows.

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Stepped spillways for embankment dams. Review, progress and development in overflow hydraulics

Cited by 9 publications

References 9 publications

Energy dissipation and flow characteristics of baffles and sills on stepped spillways

Energy dissipation and flow characteristics of baffles and sills on stepped spillways

Flow Characteristics of Skimming Flows in Stepped Channels

Turbulence manipulation in air–water flows on a stepped chute: An experimental study

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