大陆架低频声传播建模研究

Modeling of low frequency acoustic propagation loss across a continental shelf

在过去的几十年中大陆架斜坡海域的低频声传播得到越来越多的重视。针对爆炸声作为声源的一次海上实验测量数据,对大陆架海域的低频远距离声传播进行了建模研究。在实验过程中单水听器布放在水下大约240 m处接收爆炸声信号,对两条不同测线的传播损失进行了处理。本文结合海底地声模型并考虑了声速剖面的水平变化,利用抛物方程方法对传播损失进行建模。模拟计算该海域的传播损失同实验测量数据相比具有较好的一致性。

The study of acoustic propagation in a continental shelf sloping-bottom ocean environment has received much more attention in the past several decades. Measurements of low frequency acoustic propagation loss using explosive charges as sources were obtained in an experiment over a continental shelf in the sea trial. During the experiment, a single hydrophone was deployed at about 240 m to receive the signal of explosive charges. Two transmissions losses of different tracks across the continental shelf were processed. Modeling of the transmissions using parabolic equation method with a geoacoustic model of the environment which includes the range dependent sound speed profile （SSP） is presented. The model results are in excellent agreement with the measured values over the low frequency band.