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

Author(s): Hesham K. Zare; John C. Doering

Linked Author(s): Hesham K. Zare, John (Jay) Doering

Keywords: Baffle-stepped spillway; cavity; end-sill spillway; energy dissipation; flow characteristics; rounded-stepped spillway; sharp-stepped spillway; skimming flow

Abstract: 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.


Year: 2012

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