Three-dimensional, nonhydrostatic numerical simulation of nonlinear internal wave generation and propagation in the South China Sea

2011 ◽  
Vol 116 (C5) ◽  
Author(s):  
Z. Zhang ◽  
O. B. Fringer ◽  
S. R. Ramp
Keyword(s):  
Numerical Simulation ◽  
South China Sea ◽  
Internal Wave ◽  
South China ◽  
Three Dimensional ◽  
Wave Generation ◽  
The South China Sea ◽  
Nonlinear Internal Wave ◽  
China Sea ◽  
Internal Wave Generation

THREE-DIMENSIONAL ACOUSTICS EFFECTS IN THE ASIAEX SCS EXPERIMENT

2009 ◽  
Vol 17 (01) ◽  
pp. 11-27 ◽  
Author(s):  
YUNG-SHENG CHIU ◽  
YUAN-YING CHANG ◽  
LI-WEN HSIEH ◽  
MEI-CHUN YUAN ◽  
CHI-FANG CHEN
Keyword(s):  
South China Sea ◽  
Internal Wave ◽  
South China ◽  
Three Dimensional ◽  
Shelf Break ◽  
Nonlinear Internal Wave ◽  
Wave Refraction ◽  
China Sea ◽  
3D Effects ◽  
Ocean Environment

A three-dimensional (3D) ocean environment is assimilated with measured ocean data in the ASIAEX SCS (Asian Seas International Acoustics EXperiment, South China Sea) experiment. The experiment site is characterized as an active internal wave propagation region along the Northwestern shelf break of the South China Sea. Three-dimensional acoustics effects in the area are studied using FOR3DW, a wide-angle version of the parabolic equation code FOR3D (a Finite difference solution, an Ordinary differential equation, and Rational function approximations for solving 3D problems), and MOS3DPEF (MOdal Spectrum analysis based on 3D PE Field). The TL comparison between Nx2D and 3D calculations are shown to demonstrate the 3D effects. Variations in topography of the shelf break and in the water column due to the internal waves cause the 3D effects in the acoustic field. The intercomparison of the importance of bottom steering 3D effects and nonlinear internal wave refraction 3D effects is therefore proposed to realize which possesses the major part of the 3D effects. Also, 3D modal analysis results show that the nonlinear internal wave front causes severe horizontal refraction for higher modes.

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