海洋锋区的一种声速计算模式及其在声传播影响研究中的应用

A Sound Speed Computation Model in Oceanic Front Area and Its Application in Studying the Effect on Sound Propagation

利用穿过海洋锋区断面的实测CTD数据,确定了锋面的宽度、所在的位置以及陡度等特征参数,建立了海洋锋区声速计算理论模式。结果表明,此模式可以用来描述选定断面的锋面特性。将理论计算结果与实测数据进行比较,二者符合较好。进而利用二维PE模型,研究了通过海洋锋面的声传播特性。结果表明,在声源深度为50m和发射频率为150 Hz的情形下,对不同接收深度,有锋面与无锋面时传播损失的差别最大约为20 dB左右。

In this paper, the observed CTD data along a section through the oceanic front area are used to determine the front characteristic parameters such as width, location and steepness of oceanic front, and a theoretical sound speed computation model in oceanic front area is established. It is shown from the computed results that this model can be used to describe the frontal characteristics on the selected section. It is shown from the comparison results that the theoretical computed results are well consistent with the observed data. Futhermore, a two-dimensional PE model is used to study the sound propagation characteristics through an oceanic front. It is shown from the study results that for a sound source with a source depth of 50 m and a sound transmitting frequency of 150 Hz, the maximum difference in sound transmission loss for different receiver depths, summer front case and no front case is about 20 dB.