Extracting Turbulence under Breaking Waves in the Surf Zone
Publication: Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 141, Issue 6
Abstract
Separating turbulence from orbital motion under breaking waves in the surf zone is essential to understanding wave-energy dissipation. In this study, velocity data under monochromatic and random waves in the large-scale sediment-transport facility were analyzed using ensemble averaging (EA), high-pass filtering (HPF) and moving averaging (MA) to extract breaking-induced turbulence. Moving averaging provides a simple method for extracting turbulence from velocity measurements under random breaking waves collected at a reasonably high frequency. Various MA time intervals were examined. Three approaches were used to evaluate the ability of MA to extract turbulence, including (1) testing the ability of MA in extracting turbulence from artificially synthesized signals, (2) comparing turbulence strength of monochromatic wave case using MA and EA, and (3) comparing turbulence strength obtained from MA and Butterworth HPF for the random-wave case. The results indicate that approximately 30–42° phase angle (relative to the peak wave period) MA allows reasonable extraction of turbulence. The turbulence extraction particularly at the wave crest and trough can be improved by adjusting the averaging interval. An adaptive MA with variable averaging time is developed. The MA method is further examined and verified using velocity measurements in the inner surf zone at two sites along the west–central Florida coast.
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Acknowledgments
This study was funded by the Coastal Inlet Research Program of the Army Corps of Engineers and the Challenge Graduate Grant from the University of South Florida. The authors thank Dr. Ernest Smith (USACE) for providing some of the LSTF data.
References
Butt, T., Russell, P., Puleo, J. A., and Masselink, G. (2005). “The application of Bagnold-type sediment transport models in the swash zone.” J. Coast. Res., 21(5), 887–895.
Feddersen, F., and Williams, A. J., III. (2007). “Direct estimation of the Reynolds stress vertical structure in the nearshore.” J. Atmos. Ocean Tech., 24, 102–116.
Goring, D. G., and Nikora, V. I. (2002). “Despiking acoustic Doppler velocimeter data.” J. Hydraul. Eng., 117–126.
Hamilton, D. G., and Ebersole, B. A. (2001). “Establishing uniform longshore currents in a large-scale sediment transport laboratory facility.” Coastal Eng, 42(3),199–218.
Hamilton, D. G., Ebersole, B. A., Smith, E. R., and Wang, P. (2001). “Development of a large-scale laboratory facility for sediment transport research.” Tech Rep., ERDC/CHL TR-01-22, U.S. Army Engineer Waterways Experiment Station, Vicksburg, MS.
Hsu, S. A. (1988). Coastal meteorology, Academic Press, San Diego.
Kraus, N. C., Lohrmann, A., and Cabrera, R. (1994). “New acoustic meter for measuring 3D laboratory flows.” J. Hydraul. Eng., 406–412.
Kraus, N. C., and Smith, J. M. (1994). “Supertank laboratory data collection project.” Volume 1: Main text. Tech. Rep. CERC-94-3, U.S. Army Engineer Waterways Experiment Station, Coastal Engineering Research Center, Vicksburg, MS.
Longo, S. (2003). “Turbulence under spilling breakers using discrete wavelets.” Exp. Fluids, 34(2), 181–191.
Longo, S. (2006). “The effect of air bubbles on ultrasound velocity measurement.” Exp. Fluids, 41(4), 593–602.
Longo, S., Petti, M., and Losada, I. J. (2002). “Turbulence in the swash and surf zones: A review.” Coastal Eng., 45(3–4), 129–147.
Moncrieff, J. B., Clement, R., Finnigan J., and Meyers, T. (2004). “Averaging, detrending and filtering of eddy covariance time series.” Handbook of micrometeorology: A guide for surface flux measurements, X. Lee, W. J. Massman, and B. E. Law, eds., Kluwer Academic, Dordrecht, Netherlands, 7–31.
Mori, N., Suzuki, T., and Kakuno, S. (2007). “Noise of acoustic Doppler velocimeter data in bubbly flows.” J. Eng. Mech.,122–125.
Munson, B. R., Young, D. F., and Okiishi, T. H. (2006). Fundamentals of fluid mechanics, John Wiley & Sons, New York.
Nadaoka, K., Hino, M., and Koyano, Y. (1989). “Structure of the turbulent flow field under breaking waves in the surf zone.” J. Fluid Mech., 204, 359–87.
Ogston, A. S., and Sternberg, R. W. (2002). “Effect of wave breaking on sediment eddy diffusivity, suspended-sediment and longshore sediment flux profiles in the surf zone.” Cont. Shelf Res., 22(4), 633–655.
Puleo, J. A., Holland, K. T., Plant, N. G., Slinn, D. N., and Hanes, D. M. (2003). “Fluid acceleration effects on suspended sediment transport in the swash zone.” J. Geophys. Res., 108(C11), 3350–3361.
Puleo, J. A., Lanckriet, T. M., and Wang, P. (2012). “Near bed cross-shore velocity profiles, bed shear stress and friction on the foreshore of a microtidal beach.” Coastal. Eng., 68(10), 6–16.
Puleo, J. A., Mouraenko, O., and Hanes, D. M. (2004). “One-dimensional wave bottom boundary layer model comparsion: Specific eddy viscosity and turbulence closure models.” J. Waterway, Port, Coastal, Ocean Eng., 322–325.
Rodriguez, A., Sanchez-Arcilla, A., Redondo, J. M., and Mosso, C. (1999). “Macroturbulence measurements with electromagnetic and ultrasonic sensors: A comparison under high-turbulent flows.” Exp. Fluids, 27(1), 31–42.
Scott, C. P., Cox, D. T., Maddux, T. B., and Long, J. W. (2005). “Large-scale laboratory observations of turbulence on a fixed barred beach.” Meas. Sci. Technol., 16(10), 1903–1912.
Shaw, W. J., and Trowbridge, J. (2001). “The direct estimation of near bottom turbulent fluxes in the presence of energetic wave motions.” J. Atmos. Ocean Tech., 18(9), 1540–1557.
Shin, S., and Cox, D. (2006). “Laboratory observations of inner surf and swash-zone hydrodynamics on a steep slope.” Cont. Shelf Res., 26(5), 561–573.
Smith, S. W. (1997). The scientist and engineer’s guide to digital signal processing, California Technical Publishing, San Diego.
Ting, F. C. K., and Kirby, J. T. (1995). “Dynamics of surf-zone turbulence in a strong plunging breaker.” Coastal Eng., 24(3–4), 177–204.
Ting, F. C. K., and Kirby, J. T. (1996). “Dynamics of surf-zone turbulence in a spilling breaker.” Coastal Eng., 27(3–4), 131–160.
Trowbridge, J. (1998). “On a technique for measurement of turbulent shear stress in the presence of surface waves.” J. Atmos. Ocean. Tech., 15(1), 290–298.
Voulgaris, G., and Trowbridge, J. H. (1998). “Evaluation of the acoustic Doppler velocimeter (ADV) for turbulence measurements.” J. Atmos. Ocean Tech., 15(1), 272–289.
Wang, P., Ebersole, B., Smith, R. E., and Johnson, B. D. (2002a). “Temporal and spatial variations of surf-zone currents and suspended sediment concentration.” Coastal Eng., 46(3), 175–211.
Wang, P., and Kraus, C. N. (2005). “Beach profile equilibrium and patterns of wave decay and energy dissipation across the surf zone elucidated in a large-scale laboratory experiment.” J. Coastal Res., 21(3), 522–534.
Wang, P., Roberts, T. M., Dabees, M., and Horwitz, M. H. (2011). “Beach changes associated with active 2009-2010 El Niño winter along the west–central Florida barrier islands.” Proc., Coastal Sediments 2011, Vol. 2, World Scientific, Singapore, 1229–1242.
Wang, P., Smith, E. R., and Ebersole, B. A. (2002b). “Large-scale laboratory measurements of longshore sediment transport under spilling and plunging breakers.” J. Coastal Res., 18(1), 118–135.
Yoon, H. D., and Cox, D. T. (2010). “Large-scale laboratory observations of wave breaking turbulence over an evolving beach.” J. Geophys. Res., 115, C10007.
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Published In
Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 141 • Issue 6 • November 2015
Copyright
© 2015 American Society of Civil Engineers.
History
Received: Apr 28, 2014
Accepted: Feb 23, 2015
Published online: May 28, 2015
Discussion open until: Oct 28, 2015
Published in print: Nov 1, 2015
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