A note on burst event detection in unsteady natural flows

Trevethan, Mark and Chanson, Hubert (2010). A note on burst event detection in unsteady natural flows. In: Bruce Melville, Gregory De Costa and Tony Swann, Proceedings of 17th Congress of IAHR Asia and Pacific Division. 17th Congress of IAHR Asia and Pacific Division, IAHR-APD, Auckland, New Zealand, (1-10). 21-24 February 2010.

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Author Trevethan, Mark
Chanson, Hubert
Title of paper A note on burst event detection in unsteady natural flows
Conference name 17th Congress of IAHR Asia and Pacific Division, IAHR-APD
Conference location Auckland, New Zealand
Conference dates 21-24 February 2010
Proceedings title Proceedings of 17th Congress of IAHR Asia and Pacific Division
Place of Publication Auckland, New Zealand
Publication Year 2010
Year available 2010
Sub-type Fully published paper
ISBN 0868691259
Editor Bruce Melville
Gregory De Costa
Tony Swann
Start page 1
End page 10
Total pages 11
Collection year 2011
Language eng
Abstract/Summary Turbulent bursting events play a major role in natural systems in terms of sediment scour, transport and accretion as well as contaminant mixing and dispersion. The "bursts" were extensively studied in laboratory experiments under steady flow conditions, but rarely tested in unsteady natural flows. Herein a technique is described for the detection and analysis of turbulent events within large continuous data sets collected in unsteady natural flows, in particular natural estuaries. This study highlights and addresses several key issues related to burst event analysis in unsteady flows. These issues include the selection of individual sample size and event threshold value, the effect of flow reversal, and a comparison of individual samples over the entire data set. Some initial findings are presented as part of a broader investigation aimed to optimise the turbulent burst event detection technique for unsteady geophysical flows.
Subjects 090509 Water Resources Engineering
970109 Expanding Knowledge in Engineering
Keyword Turbulence
Burst events
Unsteady geophysical flows
Field measurements
References [1] Chanson, H., Takeuchi, M. and Trevethan, M., 2008a : Using turbidity and acoustic backscatter intensity as surrogate measures of suspended sediment concentration in a small sub-tropical estuary, Journal of Environmental Management, 88, pp. 1406-1416. [2] Chanson, H., Trevethan, M. and Aoki, S., 2008b : Acoustic Doppler velocimetry (ADV) in a small estuary: field experience and signal post-processing – Flow Measurement and Instrumentation, 19(5), pp. 307-313. [3] French, J. and Clifford, N., 1992 : Characteristics and ‘event structure’ of near-bed turbulence in a macrotidal saltmarsh channel, Estuarine, Coastal and Shelf Science, 34, pp. 49-69 [4]Goring, D. and Nikora, V., 2002 : Despiking Acoustic Doppler Velocimeter Data, Journal Of Hydraulic Engineering, 128(1), p.117-126. [5] Heathershaw, A., 1974 : “Bursting” phenomena in the sea, Nature, 248, pp. 394-395. [6] Kline, S., Reynolds, W., Schraub, F. and Runstaller, P., 1967 : The Structure of turbulent boundary layers, Journal of Fluid Mechanics, 30(4), pp. 741-773. [7] Johansson, A., and Alfredsson, P., 1982 : On the Structure of Turbulent Channel Flow, Journal of Fluid Mechanics, 122, pp. 295-314. [8] Lu, S. and Willmarth, W., 1973 : Measurements of the structure of the Reynolds stress in a turbulent boundary layer, Journal of Fluid Mechanics, 60(3), pp. 481-511. [9] Nakagawa, H. and Nezu, I., 1981 : Structure of space-time correlations of bursting phenomena in an open-channel flow, Journal of Fluid Mechanics, 104, pp. 1-43. [10] Narasimha, R., Rudra Kumar, S., Prabhu, A. and Kailus, S., 2007 : Turbulent flux events in a nearly neutral atmospheric boundary layer, Philosophical Translations of Royal Society A, 365, pp. 841-858. [11] Nezu, I. And Nakagawa, H., 1993 : Turbulence in Open Channel Flows, IAHR Monograph, IAHR Fluid Mechanics Section, Balkema Publ., Rotterdam, The Netherlands, 281 pages. [12] Rao, K., Narasimha, R., and Narayanan, A., 1971, : The "bursting" phenomena in a turbulent boundary layer, Journal of Fluid Mechanics, 48(2), pp. 339-352. [13] Trevethan, M., 2008 : A Fundamental Study of Turbulence and Turbulent Mixing in a Small Subtropical Estuary, Ph.D. thesis, Dept of Civil Engineering, University of Queensland, 342 pages. [14] Trevethan, M., Chanson, H. and Brown, R., 2008 : Turbulence characteristics in a small subtropical estuary during and after some moderate rainfall, Estuarine, Coastal and Shelf Science, 79(4), pp. 661-670. [15] Trevethan, M. and Chanson, H., 2009 : Turbulence and turbulent flux events in a small estuary, Environmental Fluid Mechanics, DOI 10.1007/s10652-009-9134-7, (IN-PRESS)
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Created: Mon, 08 Mar 2010, 08:14:09 EST by Hubert Chanson on behalf of School of Civil Engineering