Turbulence and turbulent flux events in a small estuary

Trevethan, Mark and Chanson, Hubert (2010) Turbulence and turbulent flux events in a small estuary. Environmental Fluid Mechanics, 10 3: 345-368.

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Author Trevethan, Mark
Chanson, Hubert
Title Turbulence and turbulent flux events in a small estuary
Journal name Environmental Fluid Mechanics   Check publisher's open access policy
ISSN 1567-7419
1573-1510
Publication date 2010-06
Year available 2009
Sub-type Article (original research)
DOI 10.1007/s10652-009-9134-7
Volume 10
Issue 3
Start page 345
End page 368
Total pages 24
Editor Benoit Cushman-Roisin
Place of publication Dordrecht, Germany
Publisher Kluwer Academic Publishers
Collection year 2011
Language eng
Subject 09 Engineering
0905 Civil Engineering
090509 Water Resources Engineering
C1
Formatted abstract Relatively little systematic research has been conducted on the turbulence characteristics of small estuaries. In the present study, detailed measurements were conducted in a small subtropical estuary with a focus on turbulent flux events. Acoustic Doppler velocimeters were installed in the mid-estuary at fixed locations and sampled simultaneously and continuously for 50 h. A turbulent flux event analysis was performed for the entire data sets extending the technique of Narasimha et al. (Phil Trans R Soc Ser A 365:841–858, 2007) to the unsteady open channel flow motion and to turbulent sub-events. Turbulent bursting events were defined in terms of the instantaneous turbulent flux. The data showed close results for all ADV units. The very-large majority of turbulent events lasted between 0.04 and 0.3 s with an average of 1 to 4 turbulent events observed per second. A number of turbulent bursting events consisted of consecutive turbulent sub-events, with between 1 and 3 sub-events per main event on average. For all ADV systems, the number of events, event duration and event amplitude showed some tidal trends, with basic differences between high- and low-water periods. A comparison between the present estuary data and the atmospheric boundary layer results of Narasimha et al. (Phil Trans R Soc Ser A 365:841–858, 2007) showed a number of similarities and demonstrated the significance of turbulent events in environmental flows. A burstiness index of 0.85 was found for the present data.
© Springer Science+Business Media B.V. 2009
Keyword Turbulence
Turbulent bursting events
Small subtropical estuary
Field measurements
Acoustic doppler velocimetry (ADV)
Turbulent sub-events
Turbulent fluxes
Burstiness index
Geophysical flows
Suspended sediment concentration
Small subtropical estuary
Boundary-layer
Channel flow
Velocity
ADV
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Published online: 21 May 2009.

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Civil Engineering Publications
Official 2011 Collection
 
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Created: Thu, 13 May 2010, 06:46:34 EST by Hubert Chanson on behalf of School of Civil Engineering