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Unsteady turbulent velocity profiling in open channel flows and tidal bores using a vectrino profiler Leng, X.; Chanson, H. (2016). Unsteady turbulent velocity profiling in open channel flows and tidal bores using a vectrino profiler. Hydraulic Model Report, CH101/15. The University of Queensland, School of Civil Engineering: Brisbane. ISBN 978-1-74272-145-3. vi, 53 + appendices pp.
Deel van: Hydraulic Model Report. The University of Queensland, School of Civil Engineering: Brisbane, meer
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Abstract |
Key experimental findings of the present study included the followings. First the unsteady velocity and Reynolds stress data measured using an ADV Vectrino II Profiler agreed closely with previous unsteady velocity and stress data measured by a (traditional) ADV Vectrino+. Second the Profiler data highlighted that not only in the initially steady flow, but also during the rapidly varied and unsteady flow phases, the longitudinal velocity component within the inner wall region followed the log law for smooth turbulent flows. Third the turbulent time and length scales of the flow before, during and after the passage of tidal bores were analysed from the Profiler data; the results suggested the anisotropic nature of the flow with much larger turbulent time and length scales in the longitudinal and vertical directions compared to the transverse direction. The orders of magnitude of turbulent time and length scales compared well with previous experimental findings. Fourth the present study found errors in estimating the time-averaged velocity and velocity fluctuations (RMS) outside of the developing turbulent boundary layers for all flow conditions. The results also indicated errors in velocity fluctuations (RMS) within the turbulent boundary layer, except for the "sweet spot" of the measuring profile (usually located at the mid-point). The errors were believed to be instrumental, and the present study chose to avoid conducting experiments at the locations where obvious errors were detected. Overall, the study demonstrated that the propagation of tidal bores is a highly unsteady turbulent process, and the performance of Vectrino II Profiler in such a rapidly-varied unsteady turbulent flow was satisfactory, provided that careful validation was undertaken for all Profiler outputs. |
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