博士 / 國立臺灣大學 / 工程科學及海洋工程學研究所 / 95 / The ocean environment is very complicated due to the effect of internal wave activity and the bathymetry changing in littoral water. This research base on the ocean mooring data in South China Sea during ASIAEX period and utilize the decomposing EOF to analysis the variation of sea water temperature which effects mainly by the internal tide and nonlinear internal wave. The EOF method can efficiently detect the activity of internal tide or nonlinear internal wave in water column. Base on the acoustic transmission track of ASIAEX and using the measuring ocean data as the input data for acoustic model can describe the acoustic field in the shelf break area. The bathymetry is the major factor of the acoustic energy changing in underwater.
The variation of ocean environment in littoral waters always high than in deep water no matter in temporal and spatial scale. The individual parameters of ocean environment, such as seawater temperature, sediment and water depth, have different variation in scale. The variation range of these parameters can present by uncertainty. To develop an ocean environment model analysis the acoustic field of effecting by ocean parameter. The parameters of most effecting acoustic field are sound speed of sediment, sound speed of basement, density of sediment and attenuation coefficient in order.
The wave equation is the basis to describe the property of underwater sound with proper initial condition and boundary condition for acoustic model to analysis the acoustic energy. The operation of acoustic model relies on precise ocean data as input in order to get correct acoustic field. This research construct a computing module that couple ocean environment and acoustic model to evaluate the sonar performance. At the end of this research, to analyze the characteristic of underwater sound around Taiwan water base on the ocean database building by academic in order to explore the operation of sonar performance. This result gives a clear picture of sonar detection that can prompt the sonar operating ability.
| Identifer | oai:union.ndltd.org:TW/095NTU05345008 |
| Date | January 2007 |
| Creators | Mei-Chun Yuan, 苑梅俊 |
| Contributors | 陳琪芳 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 160 |
Page generated in 0.1488 seconds