Calculations of internal-wave-induced fluctuations in ocean-acoustic propagation

2000 ◽  
Vol 108 (2) ◽  
pp. 526-534 ◽  
Author(s):  
Stanley M. Flatté ◽  
Galina Rovner
Keyword(s):  
Internal Wave ◽  
Acoustic Propagation ◽  
Wave Induced

scholarly journals Internal Wave Induced Fluctuations of Low‐Frequency Long‐Range Acoustic Propagation

1974 ◽  
Vol 55 (2) ◽  
pp. 443-443
Author(s):  
Robert P. Porter ◽  
R. C. Spindel ◽  
R. J. Jaffee
Keyword(s):  
Internal Wave ◽  
Long Range ◽  
Low Frequency ◽  
Acoustic Propagation ◽  
Wave Induced

scholarly journals Abyssal plain hills and internal wave turbulence

2018 ◽  
Vol 15 (14) ◽  
pp. 4387-4403 ◽  
Author(s):  
Hans van Haren
Keyword(s):  
Internal Wave ◽  
Wave Breaking ◽  
Large Scale ◽  
Abyssal Plain ◽  
Marginal Stability ◽  
Eddy Diffusivities ◽  
North East ◽  
Mid Atlantic Ridge ◽  
Ocean Topography ◽  
Wave Induced

Abstract. A 400 m long array with 201 high-resolution NIOZ temperature sensors was deployed above a north-east equatorial Pacific hilly abyssal plain for 2.5 months. The sensors sampled at a rate of 1 Hz. The lowest sensor was at 7 m above the bottom (m a.b.). The aim was to study internal waves and turbulent overturning away from large-scale ocean topography. Topography consisted of moderately elevated hills (a few hundred metres), providing a mean bottom slope of one-third of that found at the Mid-Atlantic Ridge (on 2 km horizontal scales). In contrast with observations over large-scale topography like guyots, ridges and continental slopes, the present data showed a well-defined near-homogeneous “bottom boundary layer”. However, its thickness varied strongly with time between < 7 and 100 m a.b. with a mean around 65 m a.b. The average thickness exceeded tidal current bottom-frictional heights so that internal wave breaking dominated over bottom friction. Near-bottom fronts also varied in time (and thus space). Occasional coupling was observed between the interior internal wave breaking and the near-bottom overturning, with varying up- and down- phase propagation. In contrast with currents that were dominated by the semidiurnal tide, 200 m shear was dominant at (sub-)inertial frequencies. The shear was so large that it provided a background of marginal stability for the straining high-frequency internal wave field in the interior. Daily averaged turbulence dissipation rate estimates were between 10−10 and 10−9 m2 s−3, increasing with depth, while eddy diffusivities were of the order of 10−4 m2 s−1. This most intense “near-bottom” internal-wave-induced turbulence will affect the resuspension of sediments.

The effects of near-bottom stratification on internal wave induced instabilities in the boundary layer

2017 ◽  
Vol 29 (1) ◽  
pp. 016602 ◽  
Author(s):  
Sandhya Harnanan ◽  
Marek Stastna ◽  
Nancy Soontiens
Keyword(s):  
Boundary Layer ◽  
Internal Wave ◽  
Wave Induced
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