Turbulence and Suspended Sediment Measurements in an Urban Environment during the Brisbane River Flood of January 2011
نویسندگان
چکیده
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. DOI: 10.1061/(ASCE)HY.1943-7900.0000666. © 2013 American Society of Civil Engineers. CE Database subject headings: Flood plains; Urban areas; Turbulence; Measurement; Suspended sediment; Rivers and streams; Australia. Author keywords: Flood plain; Urban environment; Turbulence measurements; Triple decomposition; Suspended sediment concentration SSC; Water body resonance; Brisbane River.
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