東沙海域海洋環(huán)境噪聲特性分析及其風(fēng)速相關(guān)性研究
[Abstract]:The attenuation of light and electromagnetic waves in sea water is very fast, and the propagation distance is short, which can not meet the needs of human activities in the ocean. Acoustic wave is the only energy radiation form in the ocean which can propagate over a long distance. In underwater target detection, underwater communication and navigation, acoustic wave is the only effective radiation energy under water. Marine environmental noise is an important acoustic feature in the ocean. Marine environmental noise contains abundant information in the ocean and interferes with the detection of sonar equipment, which is the main factor that limits the performance of passive sonar. It is also an important condition for submarine acoustic concealment and the physical parameters that must be understood. Therefore, the study of marine environmental noise is of great significance. In this study, the acoustic data obtained from the South Sea area of the Asian Sea International experiment from May 3, 2001 to May 17, 2001 were studied. 1250Hz has 8 frequencies of shallow sea environmental noise. This paper mainly includes the following aspects: 1. The research significance of marine environmental noise and its research progress at home and abroad are described. 2. This paper introduces the general situation of the Asian Sea International experiment in the South China Sea and the acoustic data obtained. 3. The research theory and method used in this study are expounded. 4. Using Matlab software to deal with the data of marine environmental noise, the time-frequency characteristics of the noise level of marine environment are analyzed, and the variation law of the noise level of marine environment with time and frequency is observed. 5. The correlation between ocean environmental noise and sea surface wind speed is analyzed. During the experiment, a tropical storm passed through, and the wind speed of the sea surface increased and decreased sharply. The changes of rainfall and wave height caused by the strong wind caused the changes of the noise in the marine environment. Based on the local wind speed data, the regression analysis of ocean environmental noise and sea surface wind speed is carried out in this paper. Based on the variation of sea surface wind speed during the transit of tropical storm, the relationship between the noise level of marine environment and the wind speed at different receiving depths is calculated, and the influence of wind speed on the noise level of marine environment at different depths is studied. The variation of ocean environmental noise level at different times in one day before and after tropical storm is analyzed, and the diurnal variation of ocean environmental noise level with wind speed is observed. Finally, the data collected by the 15th channel hydrophone are selected to carry out regression analysis between the noise level of the marine environment and the wind speed of the sea surface, and the correlation coefficient between them is calculated. According to the linear relationship between the environmental noise level SPL and the logarithmic wind speed lgv, the wind speed of the sea surface is retrieved. The inversion error is given. The results show that the noise level of the marine environment increases with the decrease of the frequency, and the high frequency environmental noise is affected by the wind. There is a process of increasing, stabilizing and decreasing slowly during the tropical storm. The correlation between the noise level of the marine environment and the wind speed of the sea surface is better in the higher frequency range, because the high frequency marine environmental noise is mainly caused by the sea surface wind, which is within the frequency range of 1000Hz~1250Hz. The correlation between the noise level of marine environment and wind speed is between 0.4 and 0.5; When the frequency is less than 200Hz, the correlation number is between-0.2 and 0.2. In this paper, the regression analysis between the noise level and the wind speed of the marine environment is made. From the inversion of the noise level of the marine environment, the magnitude of the wind speed of the sea surface is estimated, and the error range of the inversion result is about 5% or 20%. There are many factors that affect the marine environment noise in shallow sea, but the influence of tide, internal wave, ship and other factors on the marine environmental noise has not been discussed deeply in this study.
【學(xué)位授予單位】:國(guó)家海洋局第三海洋研究所
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2016
【分類(lèi)號(hào)】:P733.22
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