Estimates of Turbulence Intensity and Power Density of an Asymmetric Tidal Current under Wind Forcing Variability

A high-frequency (1.2 MHz) four-beam Acoustic Doppler Current Profiler moored on the seabed has been used for direct turbulence measurements in a tidal channel. Five tidal cycles covering calm and storm periods are selected from the measurements. The effect of the tidal cycle asymmetry and the wind...

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Bibliographic Details
Published in:Izvestiya. Atmospheric and oceanic physics 2019-03, Vol.55 (2), p.196-206
Main Authors: Korotenko, K. A., Sentchev, A. V.
Format: Article
Language:English
Subjects:
Acoustic Doppler Current Profiler
Asymmetry
Climatology
Doppler sonar
Earth and Environmental Science
Earth Sciences
Environmental Sciences
Fluid dynamics
Geophysics/Geodesy
Ocean floor
Reynolds stresses
Small-scale turbulence
Storms
Stresses
Tidal currents
Tidal cycles
Tidal flow
Tidal power
Tides
Turbulence
Turbulence intensity
Turbulence measurement
Variability
Wind
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Description
Summary:A high-frequency (1.2 MHz) four-beam Acoustic Doppler Current Profiler moored on the seabed has been used for direct turbulence measurements in a tidal channel. Five tidal cycles covering calm and storm periods are selected from the measurements. The effect of the tidal cycle asymmetry and the wind forcing variability on the turbulence intensity, Reynolds stresses, and the current energy characteristics is estimated. It is shown that the power density of the tidal flow is twice as low during the storm period than during the calm period. Wave filtering in calculating Reynolds stresses made it possible to estimate the contribution of small-scale turbulence to its intensity.
ISSN:0001-4338
1555-628X
DOI:10.1134/S0001433819020099