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Acoustic-intensity striations below the critical depth: Interpretation and modeling
Rui Duan1, Kunde Yang1, Hui Li1
1Key Laboratory of Ocean Acoustics and Sensing, Northwestern Polytechnical University, Ministry of Industry and Information Technology, Xi'an, Shaanxi 710072, China duanrui@nwpu.edu.cn, ykdzym@nwpu.edu.cn, ddstc2008@163.com, ylma@nwpu.edu.cn.
The Journal of the Acoustical Society of America
|October 2, 2017
Summary
This study introduces a new method to track acoustic intensity striations caused by underwater sound propagation interference. The technique models interference fringes to accurately predict and analyze these observed patterns.
Area of Science:
- Acoustics
- Oceanography
- Signal Processing
Background:
- Acoustic intensity plots often show striations due to interference below the critical depth.
- Understanding these striations is crucial for interpreting underwater acoustic propagation.
Purpose of the Study:
- To develop a technique for calculating the tracks of observed acoustic intensity striations.
- To model the underlying physical phenomenon causing these striations.
Main Methods:
- Modeling Lloyd's-mirror interference fringes using a ray-based description of normal modes.
- Interpreting striations as sampling fringes across different frequencies and ranges.
- Proposing a calculation method based on the derived fringe model.
Main Results:
- The presented technique successfully models and calculates the tracks of acoustic intensity striations.
- Comparison with experimental observations validates the accuracy of the proposed method.
Conclusions:
- The developed technique provides a reliable way to analyze acoustic intensity striations.
- This method enhances the understanding of acoustic propagation phenomena below critical depth.
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