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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Water engineering : Broad-crested weir operation upstream of a steep stepped spillway
Broad-crested weir operation upstream of a steep stepped spillway
Author : GANGFU ZHANG(1), & HUBERT CHANSON(2)
ABSTRACT
New experiments were performed on a large-size stepped spillway facility. The operation of the broad-crested weir was
characterised together with the steep (1V:1H) stepped chute. The introduction of a small rounding at the crest¡¯s
downstream end was shown to prevent jet deflection. The hydraulics of the weir overflow was examined, and the results
showed critical flow conditions (i.e. minimum specific energy) along most portions of the crest, although the pressure
distributions were not always hydrostatic and the velocity profiles were not uniform. The stepped chute flow was highly
aerated. The two-phase flow in the stepped chute was characterised in details. The air-water flow properties were
analysed in terms of the rate of energy dissipation, showing 60% of energy dissipation rate down the first 12 steps..
File Size : 15,288,804 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Water engineering
Date Published : 12/08/2015
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