Interaction Between Surface Gravity Waves and Near Surface Atmospheric Turbulence

1997 ◽  
Author(s):  
Tetsu Hara
Keyword(s):  
Atmospheric Turbulence ◽  
Gravity Waves ◽  
Surface Gravity ◽  
Near Surface ◽  
Surface Gravity Waves

scholarly journals Calculating Reynolds Stresses from ADCP Measurements in the Presence of Surface Gravity Waves Using the Cospectra-Fit Method

2010 ◽  
Vol 27 (5) ◽  
pp. 889-907 ◽  
Author(s):  
Anthony R. Kirincich ◽  
Steven J. Lentz ◽  
Gregory P. Gerbi
Keyword(s):  
Gravity Waves ◽  
Surface Gravity ◽  
Momentum Balance ◽  
Semiempirical Model ◽  
Reynolds Stresses ◽  
Near Surface ◽  
New Approach ◽  
Surface Gravity Waves ◽  
Boundary Layer Turbulence ◽  
Adcp Measurements

Abstract Recently, the velocity observations of acoustic Doppler current profilers (ADCPs) have been successfully used to estimate turbulent Reynolds stresses in estuaries and tidal channels. However, the presence of surface gravity waves can significantly bias stress estimates, limiting application of the technique in the coastal ocean. This work describes a new approach to estimate Reynolds stresses from ADCP velocities obtained in the presence of waves. The method fits an established semiempirical model of boundary layer turbulence to the measured turbulent cospectra at frequencies below those of surface gravity waves to estimate the stress. Applied to ADCP observations made in weakly stratified waters and variable significant wave heights, estimated near-bottom and near-surface stresses using this method compared well with independent estimates of the boundary stresses in contrast to previous methods. Additionally, the vertical structure of tidal stress estimated using the new approach matched that inferred from a linear momentum balance at stress levels below the estimated stress uncertainties. Because the method makes an estimate of the horizontal turbulent length scales present as part of the model fit, these results can also enable a direct correction for the mean bias errors resulting from instrument tilt, if these scales are long relative to the beam separation.

scholarly journals The influence of surface gravity waves on the injection of turbulence in the upper ocean

2014 ◽  
Vol 21 (3) ◽  
pp. 713-733 ◽  
Author(s):  
M. Bakhoday Paskyabi ◽  
I. Fer
Keyword(s):  
Gravity Waves ◽  
Surface Gravity ◽  
Data Sets ◽  
Langmuir Circulation ◽  
Data Set ◽  
Near Surface ◽  
Wave Forcing ◽  
Surface Gravity Waves ◽  
Surface Data ◽  
Closure Scheme

Abstract. Observations were made in the near-surface layer, at about 8 m depth in 132 m deep water off the coast of Ålesund in Norway, for a duration of 2.5 months in late 2011. The measurement period covers the passage of two low pressure systems with substantial wind and wave forcing. The time series of the dissipation rate of turbulent kinetic energy, ε, and the estimates of surface gravity waves are analysed. Dissipation rates varied by 5 orders of magnitude and reached 10-5–10-4 W kg−1 in conditions when wind speed exceeded 15 m s−1 and the significant wave height was of the order of 10 m. The data set suggests substantial injection of turbulence from breaking surface gravity waves and Langmuir turbulence. To support and interpret the observations, numerical calculations are conducted using a second-order turbulence closure scheme based on the Mellor–Yamada level 2.5 scheme, modified to incorporate the near-surface processes such as Langmuir circulation and wave breaking. The results from a run forced by observed wind and wave fields compare favourably with the observations. Comparisons with other near-surface data sets available from the literature lend confidence on our dissipation measurements and the wave-forced simulations.

scholarly journals Modeling and control of surface gravity waves in a model of a copper converter

2008 ◽  
Vol 32 (9) ◽  
pp. 1696-1710 ◽  
Author(s):  
Eduardo Godoy ◽  
Axel Osses ◽  
Jaime H. Ortega ◽  
Alvaro Valencia
Keyword(s):  
Gravity Waves ◽  
Surface Gravity ◽  
Modeling And Control ◽  
Copper Converter ◽  
Surface Gravity Waves ◽  
And Control

Irrotational, progressive surface gravity waves near the limiting height

1973 ◽  
Vol 29 (3) ◽  
pp. 94-105 ◽  
Author(s):  
Ken Sasaki ◽  
Takashi Murakami
Keyword(s):  
Gravity Waves ◽  
Surface Gravity ◽  
Surface Gravity Waves
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