Effect of a large bed roughness on positive surge propagation in canals

Yeow, Swee Chia, Wang, Hang and Chanson, Hubert (2016). Effect of a large bed roughness on positive surge propagation in canals. In: Brian Crookston and Blake Tullis, Hydraulic Structures and Water System Management. 6th IAHR International Symposium on Hydraulic Structures. IAHR International Symposium on Hydraulic Structures, Portland, OR, United States, (50-60). 27-30 June 2016. doi:10.15142/T3600628160853

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Author Yeow, Swee Chia
Wang, Hang
Chanson, Hubert
Title of paper Effect of a large bed roughness on positive surge propagation in canals
Conference name IAHR International Symposium on Hydraulic Structures
Conference location Portland, OR, United States
Conference dates 27-30 June 2016
Proceedings title Hydraulic Structures and Water System Management. 6th IAHR International Symposium on Hydraulic Structures
Place of Publication Logan, UT, United States
Publisher Utah State University
Publication Year 2016
Sub-type Fully published paper
DOI 10.15142/T3600628160853
Open Access Status DOI
ISBN 9781884575754
Editor Brian Crookston
Blake Tullis
Start page 50
End page 60
Total pages 11
Collection year 2017
Language eng
Abstract/Summary In open channels and water supply canals, the brusque operation of control valves and gates may induce large unsteady flow motions called surges. To date, the literature has focused on the propagation of surges in smooth canals, ignoring the effects of large roughness and debris. Herein, a physical study was conducted under controlled flow conditions to study the turbulent mixing in the close vicinity of a large circular bed roughness element during the upstream propagation of positive surges. Detailed free-surface and instantaneous velocity measurements were conducted with and without the large and flat cylindrical element. For a number of tests, the experiments were repeated 25 times, and the results were ensemble averaged. The data suggested that the positive surge propagation was associated with large instantaneous free-surface fluctuations for all investigated flow conditions. The velocity measurements showed large variations in longitudinal velocity during the surge generation, as well as large fluctuations of all velocity components. The presence of the large bed element modified the velocity fluctuations and unsteady Reynolds stresses in the vicinity of the element. The present results implied the potential for bed scour around the element during surge propagation.
Keyword Tidal bores
Positive surges
Compression waves
Bridge pier scour
Large bed roughness
Turbulence
Reynolds stress
Physical modelling
Q-Index Code E1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Conference Paper
Collections: School of Civil Engineering Publications
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Created: Tue, 19 Jul 2016, 06:13:19 EST by Hubert Chanson on behalf of School of Civil Engineering