| Summary: | 碩士 === 國立中山大學 === 海下科技暨應用海洋物理研究所 === 101 === The ocean ambient noise is one of the important parameters in sonar equation. The ocean ambient noise includes diverse and complex sources like waves, rain, marine life, ships, and etc. Using different ways to analyze are needed to understand the complicated properties of ambient noise. According to the data of Central Weather Bureau, northeastern Taiwan is the area with most rainfall in Taiwan. Among all kinds of ambient noise, rain-generated noise is wide in frequency range, if we know more about the rain-generated noise at sea, we can predict the effect of rainfall on underwater communication and survey. In this article, the ambient noise data were collected from MACHO（Marine Cable Hosted Observatory）system at northeastern sea of Taiwan in 2011 and 2012. Applying corresponding rainfall intensity data to observed noise level time series, observed ambient noise characteristic of each frquencies. Correlation analysis between rainfall intensity and underwater noise was performed, so the rain-generated noise level can be predicted by linear regression. The ocean ambient noise still has variations due to time and variance of sound sources, so it is important to be investigated. This study compares the statistical properties and distribution of ambient noise level at different frequencies and rainfall intensities, and also seasonal variation were discussed. Speculated the reasons for these differences, this can be the information of ambient noise analysis.
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