基于射线稳定性参数的声传播特性分析  

Analysis of deep sea acoustic propagation based on ray stability parameter

作　　者：林巨[1] 赵越[1] 王欢[1] 陈鹏 

机构地区：[1]中国海洋大学信息科学与工程学院,山东青岛266100 [2]海军青岛雷达声呐修理厂,山东青岛266100

出　　处：《南京大学学报（自然科学版）》2015年第6期1223-1233,共11页Journal of Nanjing University（Natural Science）

基　　金：国家自然科学基金(41176033);中央高校基本科研业务费(201362036);国家重点基础研究发展计划(2007CB411803);国家高技术研究发展计划(863计划)(2006AA09Z114)

摘　　要：作为深海环境中广泛存在的中尺度现象,中尺度涡极大地影响着海洋环境的温盐结构,进而影响声传播特性,人们尚未完全掌握相关的声学扰动和起伏,反之如何采用声学方法有效地进行中尺度涡监测则一直是研究难点.分析和描述中尺度涡环境下的声传播规律,开展基于声学方法的中尺度涡监测一直是人们关注的研究内容.除了声传播时间扰动等传统声学方法外,人们希望在分析和描述中尺度涡环境下的声传播规律的基础上,借助于某些声学变量如波导不变量等开展相关研究.基于射线理论和简正波理论的等效性,利用简正波水平干涉结构距离上的周期性与射线水平跨距相等的特点,采用射线稳定性参数和波动不变量描述了深海环境下的声传播特性,分析了冷涡环境下射线稳定性参数和简正波散射矩阵的等效性.利用海洋模型的数据同化结果,结合远距离射线模型声传播仿真结果,分析了南海东北部海域冷涡环境下射线稳定性参数的时变特性.结果表明,当冷涡缓慢通过声传播断面,造成声速场水平分布的微弱扰动时,射线稳定性参数结构清晰地呈现出相应的变化.与波导不变量相比,射线稳定性参数结构较稳定,能够有效反映海洋环境的时空变化特性,在深海海洋环境的声学监测应用方面具有极大潜力.As a widespread meso-scale phenomena in deep-sea environment,meso-scale eddy greatly affects marine thermohaline structure,thereby modifies underwater sound propagation characteristics,and until now the relevant acoustic signal fluctuation and perturbation under such sophisticated marine enviornment have not been understood clearly,otherwise it is still difficult to monitor the variation of meso-scale eddy efficiently by applying acoustic method.In addition to some traditional ways such as acoustic transmitting time perturbation,now some researchers has focused on applying some acoustic variables,such as waveguide invariant,based on analyzing and describing sound propagation characteristics under meso-scale eddy environment.By considering the equivalent between raynbsp;theory and normal mode theory,deep-sea sound propagation characteristics was analyzed by applying ray stability parameter and waveguide invariant,considering the equivalent between period of horizontal interference of normal mode and ray horizontal span.The equivalent between ray stability parameter and scattering matrix of normal mode was also discussed.The temporal variation of ray stability parameter under cold eddy environment in the South China Sea was analyzed by applying acoustic propagation simulation data with data assimilation result of ocean model. When the cold eddy passes the acoustic section slowly,the according results show that the variability of ray stability parameter is more stable compared with those of waveguide invariants,when sound propagate in environment consisting of a range-independent background on which a weak range-dependent perturbation is superimposed.The variation of ray stability parameter presents the temporal-spatial characteristics of marine environment more clearly, therefore there is great potentiality for applying ray stability parameter in the deep-sea acoustic monitoring.

关 键 词：射线稳定性参数 波导不变量 中尺度涡 

分 类 号：P733.2[天文地球—物理海洋学]