Flow depth and energy coefficient relationships for stepped spillways

Hunt, S. L. and Kadavy, K. C. (2014). Flow depth and energy coefficient relationships for stepped spillways. In: Hubert Chanson and Luke Toombes, Hydraulic structures and society - Engineering challenges and extremes. 5th IAHR International Symposium on Hydraulic Structures, Brisbane, Australia, (1-9). 25-27 June 2014. doi:10.14264/uql.2014.25

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Author Hunt, S. L.
Kadavy, K. C.
Title of paper Flow depth and energy coefficient relationships for stepped spillways
Conference name 5th IAHR International Symposium on Hydraulic Structures
Conference location Brisbane, Australia
Conference dates 25-27 June 2014
Proceedings title Hydraulic structures and society - Engineering challenges and extremes
Journal name ISHS 2014 - Hydraulic Structures and Society - Engineering Challenges and Extremes: Proceedings of the 5th IAHR International Symposium on Hydraulic Structures
Place of Publication Brisbane, Australia
Publisher The University of Queensland
Publication Year 2014
Year available 2014
Sub-type Fully published paper
DOI 10.14264/uql.2014.25
Open Access Status DOI
ISBN 9781742721156
Editor Hubert Chanson
Luke Toombes
Start page 1
End page 9
Total pages 9
Language eng
Abstract/Summary A multi-year, large-scale physical model study of stepped chutes was conducted over a broad range of design parameters (i.e. step heights, slopes, and unit discharges). Air entrainment developed naturally as the flow descended the chute. Air entrainment began to develop downstream of the surface inception point at L/Li = 1.0, and it became fully developed at approximately L/Li = 2.0. Depending on the chute slope, energy loss in the model ranged from 20% near L/Li = 1.0 to as much as 85% near L/Li = 6.0. The contributions of this study are the development of flow depth, clear-water flow depth, and energy coefficient relationships for stepped chutes with slopes ranging from 10 to 30°. Although stepped chutes provide significant energy dissipation, large steps may have an adverse effect on the resulting Froude number; consequently, a longer stilling basin may be required then one might expect. The results of this research are expected to make a significant impact of the design of these structures.
Keyword Stepped chute
Energy dissipation
Inception point
Stilling basin
Air entrainment
Q-Index Code E1
Q-Index Status Provisional Code
Institutional Status Non-UQ

 
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Created: Tue, 13 May 2014, 19:49:55 EST by Anthony Yeates on behalf of Scholarly Communication and Digitisation Service