【摘要】 利用Argo网格化数据分析日本以南小范围海区内的温跃层时空特征,其主跃层和季节性跃层的双跃层结构明显。依此利用UMPE(University of Miami Parabolic Equation)抛物方程模型分析与仿真深海温跃层及其季节变化对水声场的影响。分析发现:相似系数为1的两个声速剖面的传播损失几乎完全相同;夏季声源较浅时,会在以声源为中心小直径圆形区域内形成声影区;声源深度相对于跃层越大,跃层对水声场的影响越小;高频较低频受跃层影响更大。更多还原

【Abstract】 Based on gridded Argo data, the distribution feature of thermocline in a small sea area to south of Japan is analyzed, and the results of which show that the double thermocline structure of permanent and seasonal thermocline are obvious. Then the UMPE acoustic model is used to analyze and simulate the impact of thermocline on acoustic transmission loss. The results show that: two sound speed profiles with the same changing trends result in the same transmission loss; when the source is put at the small depth in summer, the TL is great in the small circle area with the source as the centre; when the depth of the source is greater, the impact of thermocline on acoustic propagation is smaller; and the impact on high frequencies is greater than on low frequencies.更多还原