从粗略的分层接口中对反向散射的宽带声学表征
Elizabeth Weidner1,2, Thomas C Weber2
1Marine Physical Laboratory, Scripps Institution of Oceanography, University of California, San Diego, California 92037, USA.
The Journal of the Acoustical Society of America
|January 4, 2024
概括
这项研究增强了声学散射模型,包括水柱接口粗度. 这种改进的方法允许更准确的远程探测水下分层和声音速度变化.
科学领域:
- 海洋学 海洋学 海洋学
- 声学 声学 在声学方面
- 流体动力学 流体动力学
背景情况:
- 声学散射模型通常假设光滑的接口,忽视现实世界的粗.
- 水柱的接口粗是由于外部强迫和对流引起的.
- 现有的模型并没有完全考虑接口粗度对声学反射散射的影响.
研究的目的:
- 扩展宽带声学反射散射分析,以纳入接口粗度.
- 开发一种远程测量分层梯度和声速扰动的方法.
- 分析接口粗度如何影响频率依赖的声学反射.
主要方法:
- 扩展了一个1D声学模型 (Weidner和韦伯,2021) 以包括表面粗度效应.
- 在各种接口粗度大小中分析了分散的压力场.
- 开发并测试使用波罗的海数据的宽带声学倒置程序.
主要成果:
- 接口粗度显著改变了依赖频率的反向散射预测.
- 接口斜率和高度是粗度影响的关键量化指标.
- 宽带倒置方法成功估计了分层和声速扰动.
结论:
- 接口粗度是水柱密度梯度的声学散射的一个关键因素.
- 开发的宽带倒置技术为水下分层的遥感提供了一种新的方法.
- 准确地描述接口粗度可以改善海洋学应用中的声学模型.
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