基于潜标测量的海洋环境噪声谱特性分析

The characteristic analysis of ambient sea noise spectrum based on submersible buoy

利用海洋环境噪声测量潜标系统对南海典型海域开展了为期3个月的海洋环境噪声测量，16通道海洋环境噪声测量系统每小时测量两分钟噪声信号。数据处理结果表明，800～5000Hz范围内，噪声谱与风速相关性最好，且风速越大相关性越好，噪声谱与风速的相关性好于与浪高的相关性。风关噪声谱级在海水中部基本不随接收深度发生变化，但由于测量水听器阵长度未能覆盖整个水深，因此未给出海面和海底处谱级变化规律。在400Hz以上的高频段整个风速范围内噪声谱级都随风速发生变化，且噪声谱级与对数风速具有很好的线性关系。

Ambient sea-noise data were collected for three month period, using submersible buoy system in the South China Sea. Broad-band ambient-noise signals from the sixteen hydrophones were amplified and recorded for 2rain every lh. The results of data processing show a strong wind dependence in the upper frequency bands from approximately 800 Hz to 5 kHz,and the greater the wind speed,the better the correlation. The noise is correlated more with wind speed than with wave height. The wind-generated spectrum level producing virtually constant noise intensity in the midwater,however,due to the length of the hydrophone failed to cover the entire depth,the distribution of the noise at the near-surface and near-bottom unable to given. In the frequencies above 400 Hz ambient-noise spectrum level ranged with the entire wind speeds. In addition it was found that the ambient-noise spectrum shown to be linearly dependent upon the logarithm of wind speed.