Hydraulics of the developing flow region of stepped spillways. II: Pressure and velocity fields

Zhang, Gangfu and Chanson, Hubert (2016) Hydraulics of the developing flow region of stepped spillways. II: Pressure and velocity fields. Journal of Hydraulic Engineering - ASCE, 142 7: . doi:10.1061/(ASCE)HY.1943-7900.0001136

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Author Zhang, Gangfu
Chanson, Hubert
Title Hydraulics of the developing flow region of stepped spillways. II: Pressure and velocity fields
Journal name Journal of Hydraulic Engineering - ASCE   Check publisher's open access policy
ISSN 0733-9429
Publication date 2016-07-01
Year available 2016
Sub-type Article (original research)
DOI 10.1061/(ASCE)HY.1943-7900.0001136
Open Access Status Other
Volume 142
Issue 7
Total pages 9
Place of publication Reston, VA, United States
Publisher American Society of Civil Engineers
Language eng
Formatted abstract
In skimming flow on a stepped spillway, the upstream flow motion is nonaerated and a turbulent boundary layer develops until the outer edge of the boundary layer interacts with the free surface; that is, at the inception point of air entrainment. Herein, new experiments were performed in the developing flow region on a large 1 V:1 H stepped spillway model with step height h = 0.10 m. The flow properties in the developing flow region were carefully documented. In the developing boundary layer, the velocity distributions followed a 1/4.5th power law at the step edges. Detailed velocity and pressure measurements showed some rapid flow redistribution between step edges and above step cavities. The application of the momentum integral equation indicated an average friction factor of 0.18, which is close to the observed air-water-flow friction factor of 0.23, suggesting that the spatially averaged dimensionless shear stress was comparable in the developing flow and fully aerated flow regions.
Keyword Stepped spillways
Developing flow region
Velocity distributions
Pressure distributions
Physical modelling
Boundary shear stress
Energy dissipation
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ
Additional Notes The deposit is a preprint of the article: ZHANG, G., and CHANSON, H. (2016). "Hydraulics of the Developing Flow Region of Stepped Spillways. II: Pressure and Velocity Fields." Journal of Hydraulic Engineering, ASCE, Vol. 142, No. 7, 9 pages (DOI:10.1061/(ASCE)HY.1943-7900.0001136) (ISSN 0733-9429).

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Civil Engineering Publications
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Created: Thu, 16 Jun 2016, 22:31:28 EST by Hubert Chanson on behalf of School of Civil Engineering