Stratified flow over topography: upstream influence and generation of nonlinear internal waves

2003 ◽  
Vol 459 (2034) ◽  
pp. 1467-1487 ◽  
Author(s):  
Patrick F. Cummins ◽  
Svein Vagle ◽  
Laurence Armi ◽  
David M. Farmer
Keyword(s):  
Internal Waves ◽  
Stratified Flow ◽  
Nonlinear Internal Waves ◽  
Flow Over Topography

The fate and impact of internal waves induced by strong shear current over a marginal ridge

2020 ◽  
Author(s):  
Peiwen Zhang ◽  
Wenjia Min
Keyword(s):  
Internal Wave ◽  
Internal Waves ◽  
Vertical Mixing ◽  
Internal Tide ◽  
Stratified Flow ◽  
Internal Tides ◽  
Energy Field ◽  
Nonlinear Internal Waves ◽  
Highly Nonlinear ◽  
Shear Current

<p>Internal waves with strong vertical mixing could be induced by stratified flow over seafloor obstacles. Noted that the stratified flow not only trigger internal tides, but also highly nonlinear internal waves like internal lee waves and internal solitary waves over steep topography features, and the highly nonlinear internal waves are suggested to play an important role in turbulence and mixing. As a typical seafloor obstacle, ridge could significantly modified the propagation of internal tide, internal lee wave and internal solitary wave. We focused on I-Lan ridge with asymmetrical topography feature in Kuroshio region. To the north of the I-Lan ridge, the depth of Philippine basin reached 4000m compared with the depth of 1500m in the south of the ridge, leading to different characteristics of internal wave energy field and ecological characteristics between two sides. Based on numerical simulations, we revealed the generation and propagation of internal waves over marginal ridge, causing by the shear current induced by Kuroshio. We also discussed the turbulence kinetic energy contributed by linear internal waves and nonlinear internal waves, providing the strength of vertical turbulent mixing around the I-Lan ridge. Then we demonstrated the characteristics of complex internal wave field in the strong background shear current over I-Lan ridge.</p>

scholarly journals Near-inertial dissipation due to stratified flow over abyssal topography

2021 ◽  
Author(s):  
Varvara Zemskova ◽  
Nicolas Grisouard
Keyword(s):  
Energy Dissipation ◽  
Kinetic Energy ◽  
Numerical Simulations ◽  
Linear Theory ◽  
Internal Waves ◽  
Wave Breaking ◽  
Large Scale ◽  
Stratified Flow ◽  
Dissipation Rates ◽  
Flow Over Topography

<p>Linear theory for steady stratified flow over topography sets the range for topographic wavenumbers over which freely propagating internal waves are generated, whose radiation and breaking contribute to energy dissipation in the interior. Previous work demonstrated that dissipation rates can be enhanced over large-scale topographies with wavenumbers outside of such radiative range. We conduct idealized rotating 3D numerical simulations of steady stratified flow over 1D topography and quantify kinetic energy dissipation. We vary topographic width, which determines whether the obstacle is within the radiative range, and height, which measures the degree of flow non-linearity. Simulations with certain width and height combinations develop periodicity in wave breaking and energy dissipation, which is enhanced in the domain interior. Dissipation rates for tall and wide non-radiative topography are comparable to those of radiative topography, even away from the bottom, which is important for the ocean where wider hills also tend to be taller. </p>

Energetics of nonlinear internal waves generated by tidal flow over topography

2013 ◽  
Vol 68 ◽  
pp. 1-8 ◽  
Author(s):  
Zhi-Wu Chen ◽  
Jieshuo Xie ◽  
Jiexin Xu ◽  
Jie-Min Zhan ◽  
Shuqun Cai
Keyword(s):  
Internal Waves ◽  
Tidal Flow ◽  
Nonlinear Internal Waves ◽  
Flow Over Topography
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