Non-linear Internal Wave Propagation in the Deep Zone of Northern South China Sea
Date Issued
2007
Date
2007
Author(s)
Lee, Chang-Wei
DOI
zh-TW
Abstract
From satellite images over the years, one can find that nonlinear internal waves (NLIWs) are very active in the northern South China Sea (SCS), from Luzon Strait in the east to the continental shelf at northwest of SCS (Liu and Hsu, 2004). But, most of the research of NLIW concentrate over the shelf of SCS, not much on the propagation of NLIW through the deep water region of SCS. So far, most the research suggest that the source of NLIW is in the Luzon Strait, but, there is definitive conclusion on the exact location of the source regions.
To understand the generation, propagation and evolution process of NLIW in SCS, we deployed 5 T-strings along 20.4N, between 119E & 121E, in 2005 and 2006 field experiment, to observe the response of isotherms during the passage of NLIW at different locations, and to infer the propagation and evolution of NLIW.
Based on the mode theory of linear internal wave, and the collected CTD data, one may derive various parameters to simulate the propagation and evolution of NLIW vs. time and distance. We found that the predicted evolution of NLIW agrees quite well with the mooring observed evolution of NLIW at all locations, and we may conclude that the generation site of NLIW is near 121E. .
Satellite images can also show the propagation and evolution of these NLIWs in the deep zone of SCS. Second order regression equation was used to simulate the wave front as seen in satellite radar images from SAR and optical images from MODIS. The displacement of these wave fronts over time, permit us to estimate the NLIW propagation speed to be 2.76 (m/s).
Subjects
非線性內波
傳遞
KdV方程式
合成孔徑雷達
nonlinear internal wave
propagation
KdV equation
SAR
Type
thesis
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