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模拟北极海冰的声学反射和反射
Nicholas P Chotiros1, Gaye Bayrakci2, Oliver Sanford3
1Applied Research Laboratories, The University of Texas at Austin, Texas 78758, USA.
The Journal of the Acoustical Society of America
|June 9, 2023
概括
向上看的声纳可以通过分析声学信号来描述北极海冰的厚度和特性. 海冰的粗度会影响信号质量,中度粗度会改善数据,而过度粗度会阻碍分析.
科学领域:
- 海洋学 海洋学 海洋学
- 声学 声学 在声学方面
- 地质物理学 地质物理学
背景情况:
- 北极海洋正在迅速变暖,需要先进的方法来监测海冰.
- 装有向上的声纳的自动水下车辆为海冰特征提供了可行的解决方案.
研究的目的:
- 为了研究向上的声纳对北极海冰的特征的潜力.
- 分析声信号与海冰特性 (如厚度和机械特性) 之间的关系.
主要方法:
- 使用波数整合代码进行了数值模拟,用于光滑冰下声纳信号.
- 对脉冲回声测量所需的声纳频率和带宽的分析.
- 来自粗的水冰接口的声学反射的模拟.
主要成果:
- 关于海冰特性的重要信息可以从声信号中提取出来,即使是在减弱的冰中.
- 离散的共振频率与剪切波速度与厚度的比率相关.
- 信号周期性与压缩波速度与厚度的比率有关,衰变率表示衰减系数.
- 适度的海冰粗度会增强声学信号,而高粗度会降低特征.
结论:
- 向上看的声纳是监测北极海冰的有希望的技术.
- 声信号分析提供了关于海冰厚度,机械性能和衰减的见解.
- 海冰表面的粗度是影响声纳特征的有效性的一个关键因素.
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