Hydraulics of Skimming Flows over Stepped Channels and Spillways

Chanson, Hubert (1994) Hydraulics of Skimming Flows over Stepped Channels and Spillways. Journal of Hydraulic Research, 32 3: 445-460.

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Author Chanson, Hubert
Title Hydraulics of Skimming Flows over Stepped Channels and Spillways
Journal name Journal of Hydraulic Research   Check publisher's open access policy
ISSN 0022-1686
Publication date 1994-01-01
Sub-type Article (original research)
Volume 32
Issue 3
Start page 445
End page 460
Total pages 16
Language eng
Subject 290802 Water and Sanitary Engineering
290800 Civil Engineering
Abstract Stepped chutes have become recently a popular method for discharging flood waters. The steps increase significantly the rate of energy dissipation taking place on the spillway face and reduce the size of the required downstream energy dissipation basin. This paper reviews the hydraulic characteristics of skimming flows. The onset of skimming flows is discussed. New results are presented to estimate the flow resistance along stepped chutes. The study indicates some major difference between the flow patterns on steep and flat stepped chutes. An analogy with flow over large roughness is developed. Then the calculations of the start of air entrainment are detailed. The results indicate that free surface aeration occurs much more upstream than on smooth spillways. The effects of flow aeration are later discussed
Keyword stepped spillways
skimming flows
flow patterns
inception point of air entrainment
flow resistance
air entrainment
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Civil Engineering Publications
 
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Created: Mon, 22 Aug 2005, 10:00:00 EST by Hubert Chanson