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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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Attached Files
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jhe07_11.pdf
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jhe07_11.pdf
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application/pdf
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356.96KB
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650
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| Author
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Chanson, Hubert
Trevethan, Mark
Koch, Christian
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| Title
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Discussion of "Turbulence Measurements with Acoustic Doppler Velocimeters" by Carlos M. Garcia, Mariano I. Cantero, Yarko Nifio, and Marcelo H. Garcia
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| Journal name
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Journal of Hydraulic Engineering (ERA 2012 Listed) (ERA 2010 Rank A*) Check publisher's open access policy
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| Publication date
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2007-11-01
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| Sub-type
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Article
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| Year available
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2007
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| DOI
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10.1061/(ASCE)0733-9429(2007)133:11(1283
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| Volume number
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133
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| Issue number
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11
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| ISSN
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0733-9429
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| Start page
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1283
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| End page
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1286
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| Total pages
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4
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| Publisher
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ASCE
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| Collection year
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2007
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| Language
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eng
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| Subject
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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
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| Abstract
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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.
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| Keyword
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Turbulence measurements
Acoustic Doppler velocimeter
Boundary effects
Sampling techniques
Field work
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| References
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Chanson, H. (2003). "A Hydraulic, Environmental and Ecological Assessment of a Sub-tropical Stream in Eastern Australia: Eprapah Creek, Victoria Point QLD on 4 April 2003." Report No. CH52/03, Dept. of Civil Engineering, The University of Queensland, Brisbane, Australia, June, 189 pages . Chanson, H. Brown, R., and Ferris, J. (2004). "Simultaneous Field Measurements of Turbulence and Water Quality in a Sub-Tropical Estuary in Australia." Proc. 15th Australasian Fluid Mech. Conf., AFMC, Sydney, Australia, M. Behnia, W. Lin & G.D. McBain Ed., Paper AFMC00016, 4 pages (CD-ROM). Chanson, H., Trevethan, M., and Aoki, S. (2005). "Acoustic Doppler Velocimetry (ADV) in a Small Estuarine System. Field Experience and "Despiking"." Proc. 31th Biennial IAHR Congress, Seoul, Korea, B.H. Jun, S.I. Lee, I.W. Seo and G.W. Choi Editors, Theme E2, Paper 0161, pp. 3954-3966. Finelli, C.M., Hart, D.D., and Fonseca, D.M. (1999). "Evaluating the Spatial Resolution of an Acoustic Doppler Velocimeter and the Consequences for Measuring Near-Bed Flows." Limnology & Oceanography, Vol. 44, No. 7, pp. 1793-1801. Goring, D.G., and Nikora, V.I. (2002). "Despiking Acoustic Doppler Velocimeter Data." Jl of Hyd. Engrg., ASCE, Vol. 128, No. 1, pp. 117-126. Discussion: Vol. 129, No. 6, pp. 484-489. Karlsson, R.I., and Johansson, T.G. (1986). "LDV Measurements of Hihger Order Moments of Velocity Fluctuations in a Turbulent Boundary Layer." Proc. 3rd Intl Symp. on Applications of Laser Anemometry to Fluid Mechanics, Libon, Portugal. (also Laser Anemometry in Fluid Mechanics III : Selected Papers from the Third International Symposium on Applications of Laser Anemometry to Fluid Mechanics, 1988, R.J. Adrian, D.F.G. Durao, F. Durst, H. Mishina and J.H. Whitelaw Ed., LADOAN-IST Publ., Chap. III, pp. 276-289. Krogstad, P.A., Andersson, H.I., Bakken, O.M., and Ashrafian, A.A. (2005). :An Experimental and Numerical Study of Channel Flow with Rough Walls." Jl of Fluid Mech., Vol. 530, pp. 327-352. Koch, C., and Chanson, H. (2005). "An Experimental Study of Tidal Bores and Positive Surges: Hydrodynamics and Turbulence of the Bore Front." Report No. CH56/05, Dept. of Civil Engineering, The University of Queensland, Brisbane, Australia, July, 170 pages (ISBN 1864998245). Liu, M., Zhu, D., and Rajaratnam, N. (2002). "Evaluation of ADV Measurements in Bubbly Two-Phase Flows." Proc. Conf. on Hydraulic Measurements and Experimental Methods, ASCE-EWRI & IAHR, Estes Park, USA, 10 pages (CD-ROM). Martin, V., Fisher, T.S.R., Millar, R.G., and Quick, M.C. (2002). "ADV Data Analysis for Turbulent Flows: Low Correlation Problem." Proc. Conf. on Hydraulic Measurements and Experimental Methods, ASCE-EWRI & IAHR, Estes Park, USA, 10 pages (CD-ROM). Nikora, V.I., and Goring, D.G. (1998). "ADV Measurements of Turbulence: can we Improve their Interpretation ?" Jl of Hyd. Engrg., ASCE, Vol. 124, No. 6, pp. 630-634. Discusion: Vol. 125, No. 9, pp. 987-988. Voulgaris, G., and Trowbridge, J.H. (1998). "Evaluation of the Acoustic Doppler Velocimeter (ADV) for Turbulence Measurements." Jl Atmosph. and Oceanic Tech., Vol. 15, pp. 272-289. Wahl, T.L. (2003). "Despiking Acoustic Doppler Velocimeter Data. Discussion." Jl of Hyd. Engrg., ASCE, Vol. 129, No. 6, pp. 484-487.
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| Q-Index Code
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CX
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| Additional Notes
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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).
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