声跃层控制声线传播弯曲模型的构建

基于斯涅耳折射定律,将海水垂向等分成若干层,利用傅里叶步近算法,构建受声速剖面唯一控制的声线传播弯曲模型。将该模型用于模拟研究不同浅海声跃层类型对声线传播弯曲的影响,得出声线波长和轨迹长度按负跃层、无跃层、正跃层的顺序逐渐增加。并利用该模型定量研究跃层深度、跃层强度、跃层厚度三特征参量对声线传播弯曲的影响,得出负跃层强度越大、厚度越大、深度越浅,声线弯曲越大,波长越小。正跃层三特征参量对声线作用相反。

Construction of an Acoustic Model to Simulate Transmission Characteristics of Sound Curves Controlled by Sound Speed Thermocline

The transmission characteristics of sound curves are affected by sound speed profiles,so the analysis of sound curves＇ transmission feature through constructing acoustic models is of great instruction significance to study the feature of underwater acoustic transmission propagation and some acoustic phenomenon （shadow zone,convergence zone） under different ocean environments.Based on the Snier Refraction Theory,the sea water is divided into several equal parts vertically,and the Fourier Step calculation method is made use of to construct acoustic curve transmission model,which is controlled by sound speed profiles.Then the model is used to the effects of different kinds of thermoclines to sound curve transmission in shallow-water,and the conclusion is obtained that the length of wave and track of sound curves increase in the order of negative thermocline,none thermocline,positive thermocline.Furthermore,the quantitative analysis of effects of thermocline depth,thermocline gratitude,thermocline thickness is made,and the conclusion is gotten that the wavelength becomes bigger when the negative thermocline gratitude or thickness increases,or the depth decreases.The three characteristic parameters of positive thermocline affect acoustic curves＇ transmission oppositely.