Interaction of internal waves with a horizontally inhomogeneous density field area overlying a ridge

1990 ◽  
Vol 1 (6) ◽  
pp. 495-500
Author(s):  
N. M. Stashchuk ◽  
L. V. Cherkesov
Keyword(s):  
Internal Waves ◽  
Density Field ◽  
Inhomogeneous Density ◽  
Field Area ◽  
Horizontally Inhomogeneous

Internal waves in a horizontally inhomogeneous flow

1984 ◽  
Vol 142 ◽  
pp. 233-249 ◽  
Author(s):  
A. Ya. Basovich ◽  
L. Sh. Tsimring
Keyword(s):  
Wave Propagation ◽  
Internal Wave ◽  
Internal Waves ◽  
Short Wave ◽  
Wave Transformation ◽  
Wave Trapping ◽  
Wave Amplification ◽  
Normal Surfaces ◽  
Inhomogeneous Flow ◽  
Horizontally Inhomogeneous

The effect of horizontally inhomogeneous flows on internal wave propagation in a stratified ocean with a constant Brunt-Väisälä frequency is analysed. Dispersion characteristics of internal waves in a moving fluid and kinematics of wave packets in smoothly inhomogeneous flows are considered using wave-normal surfaces. It is shown that internal-wave blocking and short-wave transformation may occur in longitudinally inhomogeneous flows. For parallel flows internal-wave trapping is possible in the vicinity of the limiting layer where the wave frequency in the locally comoving frame of reference coincides with the Brunt-Väisälä frequency. Internal-wave trapping also takes place in jet-type flows in the vicinity of the flow-velocity maximum. WKB solutions of the equation describing internal-wave propagation in a parallel horizontally inhomogeneous flow in the linear approximation are obtained. Singular points of this equation and the related effect of internal-wave amplification (overreflection) under the action of the flow are investigated. The spectrum and the growth rate of internal-wave localized modes in a jet-type flow are obtained.

scholarly journals A New Quasi-Horizontal Glider to Measure Biophysical Microstructure

2014 ◽  
Vol 31 (10) ◽  
pp. 2278-2293 ◽  
Author(s):  
Herminio Foloni-Neto ◽  
Rolf Lueck ◽  
Yoshiro Mabuchi ◽  
Hisato Nakamura ◽  
Masakazu Arima ◽  
...  
Keyword(s):  
High Resolution ◽  
Internal Waves ◽  
Chlorophyll A Fluorescence ◽  
Field Experiments ◽  
Density Field ◽  
Velocity Shear ◽  
Length Scale ◽  
Flight Performance ◽  
Fluorescence Sensors ◽  
Horizontal Inhomogeneity

Abstract This study describes the development of a new tethered quasi-horizontal microstructure profiler: the Turbulence Ocean Microstructure Acquisition Profiler–Glider [TurboMAP-Glider (TMG)]. It is a unique instrument, capable of measuring ocean microstructure (temperature and turbulent velocity shear), chlorophyll, and turbidity simultaneously through a quasi-horizontal perspective. Three field experiments were carried out near Joga-shima, Japan, to test the TMG flight performance, and those results as well as comparisons with a laser-based vertical profiler, TurboMAP-L (TM), are described here. The TMG was capable of flying with an angle of attack of less than 25° and was reasonably stable for up to 300 m horizontally over 100-m depth. Some new and relevant empirical results about quasi-horizontal application of high-resolution chlorophyll-a fluorescence sensors are presented. The ratio between the Thorpe length scale and the Ozmidov length scale was used as a tracer to demonstrate that most of the TMG density inversions are due to horizontal variability and not to vertical overturning. These waveform structures are probably due to the horizontal inhomogeneity of the density field and are likely caused by internal waves.

scholarly journals Analysis of Complex Typography Modulating on Internal Wave's Generation and Propagation

2018 ◽  
Vol 36 (2) ◽  
pp. 264-269
Author(s):  
Guoxing Gao ◽  
Lei Fan ◽  
Huigang Wang
Keyword(s):  
Internal Waves ◽  
Time Distribution ◽  
Stokes Equations ◽  
Density Field ◽  
Transmission Mechanism ◽  
Navier Stokes ◽  
Vorticity Field ◽  
Navier Stokes Equations ◽  
Simulation Based ◽  
Double Ridge

We use a non-hydrostatic numerical simulation based on incompressible Navier-Stokes equations to model the generation and evolution of nonlinear internal waves formed as a result of the interaction with double-ridge topography. By employing an analysis on the different-time distribution of density field, related-vorticity field which came from different profile condition of second sill, we can find and quantify the relation between the arriving time and intensity with the second sill parameter such as the depth and extensional factors. The results and progression of the internal wave's generation and propagation show the complexity, and one of the important factors is deriving from the modulating action on the state of the internal waves initial exciting from the first sill. We also present the case of coexist and evolution of "quick wave" and "slow waves". This study to reveal the ocean internal waves generated transmission mechanism is of important value.

Sign in / Sign up

Export Citation Format

Share Document