Of all the forms of radiation known, sound travels through the sea the best, therefore it is widely used in underwater detection and signal transmission. However, the ambient noise in the ocean will affect the quality of these applications, so that understanding of ambient noise is important for improving acoustic capability. Previous literatures show that ambient noise at deep water should decrease with depth, but would it be the same in the shallow? Most studies of ambient noise were made at deep water in the past, the reason is that great depth variation of ambient noise is easily observed. The ASIAEX 2001 South China Sea experiment is on the continental shelf-break, so the depth effect of ambient noise in shallow water can be explored. A typhoon shall affect experimental zone during May 10-14, 2001. From the results of this study, afternoon effect shall affect distribution of temperature and ambient noise under water depth. The other, a typhoon can not only affect seriously ambient noise, but also intercept the shine and variation of sea temperature, and reduce afternoon effect. Another, ambient noise has insignificant change with depth, however it¡¦s is much affected by the variation of temperature, frequency, and occurrence of internal wave.
| Identifer | oai:union.ndltd.org:NSYSU/oai:NSYSU:etd-0729102-125323 |
| Date | 29 July 2002 |
| Creators | Chen, Yung-Chien |
| Contributors | Shiuh-Kuang Yang, Chi-Shao Chen, Ruey-Chang Wei |
| Publisher | NSYSU |
| Source Sets | NSYSU Electronic Thesis and Dissertation Archive |
| Language | Cholon |
| Detected Language | English |
| Type | text |
| Format | application/pdf |
| Source | http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0729102-125323 |
| Rights | unrestricted, Copyright information available at source archive |
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