使用噪音水平指标,对东阿拉伯海浅水声景变异性的统计研究
Elizabeth S N X1, Nimmi R Nair2, R P Raju2
1Department of Physical Oceanography, School of Marine Science, Cochin University of Science and Technology, Kochi, Kerala, 682016, India. shany.pisces@gmail.com.
Environmental monitoring and assessment
|October 13, 2023
概括
监测水下声景揭示了噪声水平和类型的季节性变化,这对于了解人类对海洋息地的影响至关重要. 标准噪声指标有效地描述了这些时空音景变化.
科学领域:
- 海洋学 海洋学 海洋学
- 海洋声学 海洋声学
- 环境监测环境监测环境监测
背景情况:
- 水下声音景观表现出受噪声源和环境因素影响的变化.
- 人类活动正在增加水下噪音,对海洋生态系统构成风险.
- 持续监测背景声音对于评估声景变异性至关重要.
研究的目的:
- 评估阿拉伯海东部水下声音景观的时空变化.
- 评估标准噪声指标对于描述声音景观特征的适用性.
- 分析季节变化和深度对水下噪声场的影响.
主要方法:
- 使用的标准噪声水平指标:平均值 (μ),第90百分点 (90P),标准偏差 (σ) 和曲率 (β).
- 分析了阿拉伯海东部三个沿海站的噪音场数据.
- 使用直方图表示和概率密度函数 (PDF) 进行光谱分析.
- 研究了两个光谱频段:交通和风噪,使用500毫秒的时间窗口.
主要成果:
- 噪声指标有效地描述了关于季节,频率和深度的音景变化.
- 季节性分析显示了依赖于深度的噪声水平变化:由于表面管道,夏季降低,冬季增加.
- 库尔托斯指标表明了复合信号的冲动性.
- 声速特征显著影响噪声场,通过噪声建模证实了这一点.
结论:
- 标准噪声指标适用于描述水下声音景观的变化.
- 水下噪音的季节性和深度依赖的模式是显著的.
- 了解环境因素影响的声音传播对于海洋噪声管理至关重要.
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