Vectrino Profiler Spatial Filtering for Shear Flows Based on the Mean Velocity Gradient Equation
Publication: Journal of Hydraulic Engineering
Volume 144, Issue 7
Abstract
A new methodology is proposed to spatially filter acoustic Doppler velocimetry data from a Vectrino profiler based on the differential mean velocity equation. Lower and upper bounds are formulated in terms of physically based flow constraints. Practical implementation is discussed, and its application is tested against data gathered from an open-channel flow over a stepped macroroughness surface. The method has proven to detect outliers occurring all over the distance range sampled by the Vectrino profiler and has shown to remain applicable out of the region of validity of the velocity gradient equation. Finally, a statistical analysis suggests that physically obtained bounds are asymptotically representative.
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Acknowledgments
The presented work was part of the research project waveSTEPS, which is funded by the German Federal Ministry of Education and Research (BMBF, Project No. 03KIS119).
References
Blanckaert, K., and U. Lemmin. 2006. “Means of noise reduction in acoustic turbulence measurements.” J. Hydraul. Res. 44 (1): 3–17. https://doi.org/10.1080/00221686.2006.9521657.
Brand, A., C. Noss, C. Dinkel, and M. Holzner. 2016. “High-resolution measurements of turbulent flow close to the sediment-water interface using a bistatic acoustic profiler.” J. Atmos. Oceanic Technol. 33 (4): 769–788. https://doi.org/10.1175/JTECH-D-15-0152.1.
Cameron, S. M., V. I. Nikora, and M. T. Stewart. 2017. “Very-large-scale motions in rough-bed open-channel flow.” J. Fluid Mech. 814: 416–429. https://doi.org/10.1017/jfm.2017.24.
Chanson, H., M. Trevethan, and S. I. Aoki. 2008. “Acoustic Doppler velocimetry (ADV) in small estuary: Field experience and signal post-processing.” Flow Meas. Instrum. 19 (5): 307–313. https://doi.org/10.1016/j.flowmeasinst.2008.03.003.
Cheng, N. S. 2017. “Simple modification of Manning-Strickler formula for large-scale roughness.” J. Hydraul. Eng. 143 (9): 04017031. https://doi.org/10.1061/(ASCE)HY.1943-7900.0001345.
Davidson, P. A. 2015. Turbulence: An introduction for scientists and engineers. 2nd ed. Oxford, UK: Oxford University Press.
García, C. M., M. I. Cantero, Y. Niño, and M. H. Gacía. 2005. “Turbulence measurements with acoustic Doppler velocimeters.” J. Hydraul. Eng. 131 (11): 1289–1292. https://doi.org/10.1061/(ASCE)0733-9429(2005)131:12(1062).
Goring, D. G., and V. I. Nikora. 2002. “Despiking acoustic Doppler velocimeter data.” J. Hydraul. Eng. 128 (1): 117–126. https://doi.org/10.1061/(ASCE)0733-9429(2002)128:1(117).
Hurther, D., and U. Lemmin. 2001. “A correction method for turbulence measurements with a 3D acoustic Doppler velocity profiler.” J. Atmos. Oceanic Technol. 18 (3): 446–458. https://doi.org/10.1175/1520-0426(2001)018%3C0446:ACMFTM%3E2.0.CO;2.
Khorsandi, B., L. Mydlarski, and S. Gaskin. 2012. “Noise in turbulence measurements using acoustic Doppler velocimetry.” J. Hydraul. Eng. 138 (10): 829–838. https://doi.org/10.1061/(ASCE)HY.1943-7900.0000589.
Koca, K., C. Noss, C. Anlanger, A. Brand, and A. Lorke. 2017. “Performance of the Vectrino profiler at the sediment–water interface.” J. Hydraul. Res. 55 (4): 573–581. https://doi.org/10.1080/00221686.2016.1275049.
Landau, L. D., and E. M. Lifshitz. 1987. Fluid mechanics. Vol. 6 of Course of theoretical physics. 2nd ed. Oxford, UK: Elsevier Butterworth-Heinemann.
Leng, X., and H. Chanson. 2015. Unsteady turbulence during the upstream propagation of undular and breaking tidal bores: An experimental investigation. Brisbane, Australia: Univ. of Queensland.
Leys, C., C. Ley, O. Klein, P. Bernard, and L. Licata. 2013. “Detecting outliers: Do not use standard deviation around the mean, use absolute deviation around the median.” J. Exp. Social Psychol. 49 (4): 764–766. https://doi.org/10.1016/j.jesp.2013.03.013.
MacVicar, B. J., S. Dilling, R. W. J. Lacey, and K. Hipel. 2014. “A quality analysis of the Vectrino II instrument using a new open-source MATLAB toolbox and 2D ARMA models to detect and replace spikes.” In Proc., River Flow 2014, edited by A. J. Schleiss, G. De Cesare, M. J. Franca, and M. Pfister. Leiden, Netherlands: CRC Press.
Monin, A. S., and A. M. Yaglom. 2007. Statistical fluid mechanics, Vol. 1 of Mechanics of turbulence. Mineola, NY: Dover Publications.
Nikora, V., K. Koll, S. McLean, A. Dittrich, and J. Aberle. 2002. “Zero-plane displacement for rough-bed open-channel flows.” In Proc., River Flow 2002—Int. Conf. on Fluvial Hydraulics, edited by D. Bousmar and Y. Zech. Lisse, Netherlands: Swets and Zeitlinger.
Pope, S. B. 2000. Turbulent flows. Cambridge, UK: Cambridge University Press.
Ross, S. M. 2009. Introduction to probability and statistics for engineers and scientists. 4th ed. Amsterdam, Netherlands: Academic Press.
Thomas, R. E., L. Schindfessel, S. J. McLelland, S. Creëlle, and T. De Mulder. 2017. “Bias in mean velocities and noise in variances and covariances measured using a multistatic acoustic profiler: The Nortek Vectrino Profiler.” Meas. Sci. Technol. 28 (7): 075302. https://doi.org/10.1088/1361-6501/aa7273.
Wahl, T. L. 2003. “Discussion of ‘Despiking acoustic Doppler velocimeter data’ by Derek G. Goring and Vladimir I. Nikora.” J. Hydraul. Eng. 129 (6): 484–487. https://doi.org/10.1061/(ASCE)0733-9429(2003)129:6(484).
Zedel, L., and A. E. Hay. 2011. “Turbulence measurements in a jet: Comparing the Vectrino and Vectrino II.” In Proc., IEEE/OES/CWTM 10th Working Conf. on Current Measurement Technology. Monterey, CA: IEEE.
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Information
Published In
Journal of Hydraulic Engineering
Volume 144 • Issue 7 • July 2018
Copyright
©2018 American Society of Civil Engineers.
History
Received: Jul 28, 2017
Accepted: Jan 25, 2018
Published online: Apr 30, 2018
Published in print: Jul 1, 2018
Discussion open until: Sep 30, 2018
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