Negative surges and unsteady turbulent mixing induced by rapid gate opening in a channel

Leng, Xinqian and Chanson, Hubert (2015) Negative surges and unsteady turbulent mixing induced by rapid gate opening in a channel. Experimental Thermal and Fluid Science, 63 133-143. doi:10.1016/j.expthermflusci.2014.06.015

Attached Files (Some files may be inaccessible until you login with your UQ eSpace credentials)
Name Description MIMEType Size Downloads
Art_323e_preprint.pdf Full text (open access) application/pdf 1.74MB 0

Author Leng, Xinqian
Chanson, Hubert
Title Negative surges and unsteady turbulent mixing induced by rapid gate opening in a channel
Journal name Experimental Thermal and Fluid Science   Check publisher's open access policy
ISSN 0894-1777
Publication date 2015-05
Year available 2014
Sub-type Article (original research)
DOI 10.1016/j.expthermflusci.2014.06.015
Open Access Status
Volume 63
Start page 133
End page 143
Total pages 11
Place of publication Philadelphia, PA United States
Publisher Elsevier
Collection year 2015
Language eng
Abstract A negative surge is an unsteady open channel flow characterised by a drop in water surface elevation. In this study, a negative surge generated by the rapid gate opening was investigated experimentally with three types of bed roughness. Both instantaneous free-surface and velocity measurements were performed and the results were ensemble-averaged. The experimental data showed a rapid flow acceleration beneath the negative surge, and large and rapid fluctuations in all instantaneous velocity components were observed during the passage of the negative surge leading edge. The Reynolds stress data showed large ensemble-average and fluctuation levels, significantly larger than in the initially steady flow, occurring slightly after the passage of the surge leading edge. The time difference between the maximum Reynolds stress and surge leading edge was observed to increase with increasing distance from the gate, and it was comparable to the time delay for the occurrence of maximum free-surface fluctuations. The findings suggested that the unsteady flow properties were little affected by the bed roughness, despite the broad range of equivalent sand roughness heights tested herein.
Keyword Negative surges
Physical modelling
Bed roughness
Free-surface measurements
Unsteady turbulent mixing
Velocity measurements
Reynolds stresses
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Published online ahead of print 23 June 2014

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Civil Engineering Publications
Official 2015 Collection
Version Filter Type
Citation counts: TR Web of Science Citation Count  Cited 1 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 0 times in Scopus Article
Google Scholar Search Google Scholar
Created: Tue, 21 Oct 2014, 02:14:15 EST by System User on behalf of School of Civil Engineering