Results 131 to 140 of about 657 (163)

Converging RCC Stepped Spillways

World Environmental and Water Resource Congress 2006, 2006
The United States Department of Agriculture (USDA), Natural Resources Conservation Service (NRCS) estimates that nearly half of the small watershed dams constructed with their assistance will reach the end of their planned service life within the next 10 years.
S. L. Hunt, K. C. Kadavy, D. M. Temple
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Hydraulic design of stepped spillways

2002
Roller Compacted Concrete (RCC) is becoming an increasingly popular method of constructing and protecting dam embankments. RCC naturally lends itself to a stepped configuration by the construction technique of roller compacting successive horizontal concrete lifts. To date, there have been numerous RCC stepped spillways constructed worldwide, yet there
Ward, Jason Paul, Ruff, James, Falvey, Henry, Nelson, John, Ward, Robert   +4 more
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Energy Dissipation on Stepped Spillways

Journal of Hydraulic Engineering, 1993
Potentially high energy dissipation on stepped overflow spillways would imply a significant reduction of the size of downstream stilling basins. The amount of energy loss on such spillways under skimming‐flow conditions is examined experimentally for structures with a moderate number of steps and a width‐to‐height ratio equal to 0.7.
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Two-Phase Flow Characteristics of Stepped Spillways

Journal of Hydraulic Engineering, 2003
An experimental study on a large model flume with fiber-optical instrumentation indicated that minimum Reynolds and Weber numbers of about 10 and 100, respectively, are required for viscosity and surface tension effects to become negligible compared to gravitational and inertial forces expressed by Froude similitude.
Boes, Robert M., Hager, Willi H.
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Energy dissipation on embankment dam stepped spillways, overflow stepped weirs and masonry stepped spillways

2010
Stepped spillways are designed to increase the rate of energy dissipation on the chute reducing the size of a downstream energy dissipator. The prediction of the turbulent dissipation above the steps constitutes a critical part of the design process, especially at large discharges per unit width corresponding to the skimming flow regime.
Chanson, Hubert, Felder, Stefan
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Skimming Flow in Stepped Spillways

Journal of Hydraulic Engineering, 1990
Flow on stepped spillways can be divided into nappe and skimming flow regimes. This technical note presents an approximate method of predicting the characteristics of skimming flow on stepped spillways. Expressing the turbulent shear stress between the skimming stream and the recirculating fluid, trapped by the stream between the steps, in terms of a ...
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Recent advances in stepped spillway design

2004
New experiments were conducted in a large stepped channel with a 22 degree slope operating at large Reynolds numbers. Interactions between free-surface and cavity recirculation were systematically investigated in the skimming flow regime. Turbulence manipulation was further conducted and identical experiments were performed with 4 configurations. Basic
Chanson, H., Gonzalez, C. A.
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Flow regimes on stepped spillways

2001
The recent improvements of the construction techniques and the particular attention to the environment have renewed the interest in stepped spillways. New experimental investigations have been carried out at the Technical University of Bari, extending the available data on the hydraulic behaviour. The classification of flow regimes has been re-analysed,
De Marinis, G, Fratino, U, Piccinni, AF
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Stepped Spillways

2004
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THE HYDRAULICS OF STEPPED CHUTES AND SPILLWAYS

2002
Stepped channel designs have been used for more than 3,500 years. A significant number of dams were built with overflow stepped spillways during the nineteenth and early twentieth centuries, before the design technique became outdated with the progresses in hydraulic jump stilling basin design. Recent advances in technology (e.g.
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