Abstract For high frequency ocean acoustic modeling applications, seabed reflection loss is a useful alternative input compared to conventional geoacoustic model parameters. Reflection loss can be estimated by comparing the noise intensity of the up and down components of the ambient noise vertical directionality pattern. The potential of this method is demonstrated with experimental data spanning one week, collected off shallow east coast of India using a 21 element vertical hydrophone array. The compact and easily operable vertical array has been designed for high frequency directionality estimation in the band 2–10 kHz. The ambient noise data are beam formed to arrive at the vertical directionality pattern. Further reflection loss values as a function of frequency and grazing angle have been estimated for 1/3 octave bands for a sandy sea bed in warm tropical waters. This has been compared with modeled reflection loss estimates using OASR reflection loss module of OASES. This will serve as inputs to propagation models for applications such as inverse techniques, ambient noise modelling, and sonar system performance prediction.

中文翻译：

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具有快速声速底部的浅热带站点的环境噪声垂直方向性和反射损耗估计

摘要 对于高频海洋声学建模应用，与传统地声模型参数相比，海底反射损失是一种有用的替代输入。可以通过比较环境噪声垂直方向性模式的上下分量的噪声强度来估计反射损耗。使用 21 单元垂直水听器阵列在印度浅东海岸附近收集的为期一周的实验数据证明了这种方法的潜力。紧凑且易于操作的垂直阵列专为 2-10 kHz 频段的高频方向性估计而设计。环境噪声数据被波束形成以到达垂直方向性图案。对于温暖热带水域的沙质海床的 1/3 倍频程频带，估计了作为频率和掠射角函数的进一步反射损耗值。这已与使用 OASES 的 OASR 反射损耗模块的模拟反射损耗估计进行了比较。这将作为逆向技术、环境噪声建模和声纳系统性能预测等应用的传播模型的输入。