Turbulence and suspended sediment measurements in an urban environment during the Brisbane River flood of January 2011

Brown, Richard J. & Chanson, Hubert (2012) Turbulence and suspended sediment measurements in an urban environment during the Brisbane River flood of January 2011. Journal of Hydraulic Engineering, 139(2), pp. 244-253.

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Abstract

In urbanised areas, the 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 analysed using a triple decomposition. The velocity fluctuations included a large energy component in the slow fluctuation range, while 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 period flows is well suited to complicated flows in an inundated urban environment.

Impact and interest:

7 citations in Scopus
6 citations in Web of Science®
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320 since deposited on 09 Aug 2012
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ID Code: 53045
Item Type: Journal Article
Refereed: Yes
Keywords: Flood plain, urban environment, turbulence measurements, triple decomposition, suspended sediment concentration SSC, water body resonance, Brisbane River
DOI: 10.1061/(ASCE)HY.1943-7900.0000666
ISSN: 0733-9429
Divisions: Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2012 American Society of Civil Engineers
Deposited On: 09 Aug 2012 04:28
Last Modified: 22 Feb 2013 16:08

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