Discussion of "Turbulence Measurements with Acoustic Doppler Velocimeters" by Carlos M. Garcia, Mariano I. Cantero, Yarko Nifio, and Marcelo H. Garcia

Chanson, Hubert, Trevethan, Mark and Koch, Christian (2007) Discussion of "Turbulence Measurements with Acoustic Doppler Velocimeters" by Carlos M. Garcia, Mariano I. Cantero, Yarko Nifio, and Marcelo H. Garcia. Journal of Hydraulic Engineering, 133 11: 1283-1286.

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Author Chanson, Hubert
Trevethan, Mark
Koch, Christian
Title Discussion of "Turbulence Measurements with Acoustic Doppler Velocimeters" by Carlos M. Garcia, Mariano I. Cantero, Yarko Nifio, and Marcelo H. Garcia
Journal name Journal of Hydraulic Engineering   Check publisher's open access policy
ISSN 0733-9429
Publication date 2007-11-01
Year available 2007
Sub-type Article (original research)
DOI 10.1061/(ASCE)0733-9429(2007)133:11(1283
Volume 133
Issue 11
Start page 1283
End page 1286
Total pages 4
Publisher ASCE
Collection year 2007
Language eng
Subject 240000 Physical Sciences
240500 Classical Physics
240502 Fluid Physics
290000 Engineering and Technology
290800 Civil Engineering
290802 Water and Sanitary Engineering
291800 Interdisciplinary Engineering
291803 Turbulent Flows
Abstract The contribution was a timely notice that acoustic Doppler velocimeters have intrinsic weaknesses and that their signal outputs are not always "true" turbulence measurements. Herein it is demonstrated that, in steady open channel flows, the sampling record must be larger than 5,000 samples to yield minimum errors on first and second statistical moments of the velocity components. Significantly longer records (more than 50,000 samples) are required for accurate determination of higher statistical moments (e.g. skewness, kurtosis), Reynolds stresses and triple correlations. Further ADV signal outputs are adversely affected by the proximity of solid boundaries, particularly when the sampling volume is located less than 30 to 45 mm from the wall. Recent field observations in a small estuary showed also that ADV records may be affected by various disturbances including wildlife and man-made interferences. Comparative analyses of long duration, high-frequency data sets highlighted the needs for advanced post-processing techniques. It is hoped that the authors' contribution and the present discussion will stress enough the needs to educate and adequately train technicians, engineers, scientists and researchers deploying ADVs in the field, including portable ADV systems.
Keyword Turbulence measurements
Acoustic Doppler velocimeter
Boundary effects
Sampling techniques
Field work
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Q-Index Code CX
Additional Notes The full bibliographic details are : CHANSON, H., TREVETHAN, M., and KOCH, C. (2007). "Turbulence Measurements with Acoustic Doppler Velocimeters. Discussion." Journal of Hydraulic Engineering, ASCE, Vol. 133, No. 11, pp. 1283-1286 (DOI: 10.1061/(ASCE)0733-9429(2007)133:11(1283)) (ISSN 0733-9429).

Document type: Journal Article
Sub-type: Article (original research)
Collections: Excellence in Research Australia (ERA) - Collection
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