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本文是研究标准海区中在各种海洋条件下的浅水衰减损失。用船舶-飞机联合观测的方法、结合有关的环境参数确定了声传播特性。选定海区中的全部环境参数仅有很微小的横向变化,因此能够顺利的掌握观测。迄今所得的数据指出:在声传播中有或无海面因素加入,对衰减特性具有典型的频率响应差异。在仅有海底参与声传播的情况下,衰减的幅度和频响为由一海底模型所组成的一级近似,此模型只相当于一个具有复数声速和密度的准流体、平滑、分层的海底。
In this paper, we study the shallow water attenuation loss under various sea conditions in a standard sea area. The acoustic propagation characteristics were determined by the joint ship-aircraft observation method and the related environmental parameters. All the environmental parameters in the selected sea area have only slight lateral changes, so that the observation can be well controlled. The data so far pointed out that the presence or absence of sea-surface factors in acoustic propagation has a typical frequency response difference in attenuation characteristics. In the case where only the seafloor is involved in acoustic propagation, the amplitude and frequency response of the attenuation are first-order approximations made up of a subsea model that is equivalent to a quasi-fluid with a complex sound velocity and density, a smooth, layered seafloor .