Turbulence and Suspended Sediment Measurements in an Urban Environment during the Brisbane River Flood of January 2011
Publication: Journal of Hydraulic Engineering
Volume 139, Issue 2
Abstract
In urbanized areas, flood flows constitute a hazard to populations and infrastructure, as illustrated during major floods in 2011. During the 2011 Brisbane River flood, some turbulent velocity data were collected using acoustic Doppler velocimetry in an inundated street. The field deployment showed some unusual features of flood flow in the urban environment. That is, the water elevations and velocities fluctuated with distinctive periods between 50 and 100 s linked with some local topographic effects. The instantaneous velocity data were analyzed using a triple decomposition. The velocity fluctuations included a large energy component in the slow fluctuation range, whereas the turbulent motion components were much smaller. The suspended sediment data showed some significant longitudinal flux. Altogether, the results highlighted that the triple decomposition approach originally developed for periodic flows is well-suited to complicated flows in an inundated urban environment.
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Acknowledgments
The authors thank all people who participated in the field study, as well as those who assisted with the preparation and data analysis; without them, the study would not have been possible. The authors acknowledge some helpful discussions with Dr. Frédérique Larrarte, Dr. Mark Trevethan, and Professor Laurent David. Lastly, the authors thank their respective families for their support during the difficult period of the flood in Brisbane.
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Information & Authors
Information
Published In
Journal of Hydraulic Engineering
Volume 139 • Issue 2 • February 2013
Pages: 244 - 253
Copyright
© 2013 American Society of Civil Engineers.
History
Received: Oct 21, 2011
Accepted: Jul 26, 2012
Published online: Aug 7, 2012
Published in print: Feb 1, 2013
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