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Underwater sound channel in the northeastern East China Sea

机译:东海东北部的水下声通道

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摘要

In May 2015 a shallow-water acoustic variability experiment (SAVEX15) was conducted in the northeastern East China Sea. Surprisingly, an Underwater sound channel that is typical for deep water was discovered in this shallow water waveguide (similar to 100 m deep) with the channel axis at around 40 m. For a broad-band source (0.5-2.0 kHz) deployed close to the channel axis, channel impulse responses observed by a vertical array exhibited a complex arrival structure with a large delay spread (e.g., 160 milliseconds). Most arrivals are found to be surface and bottom reflected, while a pair of high-intensity refracted arrivals are embedded in the early reflected arrivals. Broadband simulations based on a normal mode propagation model show good agreement with data.
机译:2015年5月,在东海东北部进行了浅水声变异实验(SAVEX15)。出乎意料的是,在此浅水波导(约100 m深)中发现了深水典型的水下声通道,其通道轴位于40 m左右。对于靠近信道轴部署的宽带源(0.5-2.0kHz),由垂直阵列观察到的信道冲激响应表现出具有大的延迟扩展(例如160毫秒)的复杂的到达结构。发现大多数到达都是表面反射和底部反射,而在早期反射到达中嵌入了一对高强度折射到达。基于正常模式传播模型的宽带仿真显示出与数据的良好一致性。

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