scholarly journals Parameter dependence of acoustic mode quantities in an idealized model for shallow-water nonlinear internal wave ducts

2019 ◽  
Vol 146 (3) ◽  
pp. 1934-1945 ◽  
Author(s):  
Matthew A. Milone ◽  
Brendan J. DeCourcy ◽  
Ying-Tsong Lin ◽  
William L. Siegmann
Keyword(s):  
Internal Wave ◽  
Shallow Water ◽  
Acoustic Mode ◽  
Parameter Dependence ◽  
Nonlinear Internal Wave ◽  
Idealized Model

A multi-layer model for nonlinear internal wave propagation in shallow water

2012 ◽  
Vol 695 ◽  
pp. 341-365 ◽  
Author(s):  
Philip L.-F. Liu ◽  
Xiaoming Wang
Keyword(s):  
Wave Propagation ◽  
Internal Wave ◽  
Shallow Water ◽  
Internal Waves ◽  
Bottom Topography ◽  
Laboratory Data ◽  
Constant Density ◽  
Layer Model ◽  
Fluid System ◽  
Nonlinear Internal Wave

AbstractIn this paper, a multi-layer model is developed for the purpose of studying nonlinear internal wave propagation in shallow water. The methodology employed in constructing the multi-layer model is similar to that used in deriving Boussinesq-type equations for surface gravity waves. It can also be viewed as an extension of the two-layer model developed by Choi & Camassa. The multi-layer model approximates the continuous density stratification by an $N$-layer fluid system in which a constant density is assumed in each layer. This allows the model to investigate higher-mode internal waves. Furthermore, the model is capable of simulating large-amplitude internal waves up to the breaking point. However, the model is limited by the assumption that the total water depth is shallow in comparison with the wavelength of interest. Furthermore, the vertical vorticity must vanish, while the horizontal vorticity components are weak. Numerical examples for strongly nonlinear waves are compared with laboratory data and other numerical studies in a two-layer fluid system. Good agreement is observed. The generation and propagation of mode-1 and mode-2 internal waves and their interactions with bottom topography are also investigated.

Acoustic mode coupling induced by internal wave fields in shallow water

1995 ◽  
Vol 98 (5) ◽  
pp. 2869-2869
Author(s):  
Steven Finette ◽  
Dirk Tielbuerger ◽  
Stephen Wolf
Keyword(s):  
Internal Wave ◽  
Shallow Water ◽  
Mode Coupling ◽  
Acoustic Mode ◽  
Wave Fields

Nonlinear Internal Wave Interactions with Low Frequency Shallow Water Sound—What is left to Do?

2010 ◽  
Author(s):  
James F. Lynch ◽  
Timothy F. Duda ◽  
Ying-Tsong Lin ◽  
Arthur E. Newhall ◽  
Jeffrey Simmen ◽  
...  
Keyword(s):  
Internal Wave ◽  
Shallow Water ◽  
Low Frequency ◽  
Wave Interactions ◽  
Nonlinear Internal Wave

Acoustic mode‐coupling loss caused by internal wave packets in shallow water

1990 ◽  
Vol 87 (S1) ◽  
pp. S27-S27
Author(s):  
Xue‐zhen Zhang ◽  
Ji‐xun Zhou ◽  
Peter Rogers
Keyword(s):  
Internal Wave ◽  
Shallow Water ◽  
Mode Coupling ◽  
Wave Packets ◽  
Acoustic Mode ◽  
Coupling Loss

scholarly journals THREE-DIMENSIONAL ACOUSTIC SIMULATION OF AN ACOUSTIC REFRACTION BY A NONLINEAR INTERNAL WAVE IN A WEDGE BATHYMETRY

2010 ◽  
Vol 18 (03) ◽  
pp. 279-296 ◽  
Author(s):  
LINUS Y. S. CHIU ◽  
ANDREA Y. Y. CHANG ◽  
CHI-FANG CHEN ◽  
RUEY-CHANG WEI ◽  
YING-JANG YANG ◽  
...  
Keyword(s):  
Internal Wave ◽  
Transmission Loss ◽  
Three Dimensional ◽  
Joint Effect ◽  
Acoustic Mode ◽  
Acoustic Energy ◽  
Acoustic Effect ◽  
Nonlinear Internal Wave ◽  
Mode Amplitude ◽  
Whispering Gallery

Nonlinear internal wave (NIW) results in three dimensional acoustic effect such as ducting and whispering gallery effects in acoustic propagation. Acoustic energy restricted within internal wave crests (crest–crest) on the shelf constitutes the ducting effect, and energy confined along the crest when the source is located upslope from the NIW crest is known as the whispering gallery effect. Numerical experiments are presented in this paper for the study of 3D acoustic effects caused by both internal wave and wedge-bathymetry. 3D effects are predicted by Wide-Angle-FOR3D and the modal contents are calculated by MOS3DPEF. Following are the case studies detailing differences between 2D and 3D calculation, and the joint effect of propagating internal waves with upslope-bathymetry. Modeled time series of transmission Loss reveal that internal wave induces the oceanic waveguide and concentrate acoustic energy along the wave front. By modeling larger calculation ranges (20 km) and deeper deploying sources, the changing of the growth and decline of acoustic energy and lower acoustic mode amplitude by range, along the front of internal wave can be observed in this paper.

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