浅海温跃层对声信道影响的仿真研究

温跃层环境下的声速剖面结构变化对浅海声信道有着重要影响。应用Kraken简正波模式对浅海声信道的能量场进行了仿真研究,讨论了声传播损失对温跃层强度和温跃层位置两类参数变化的敏感性。仿真计算结果表明,跃层的增强将使传播损失明显增大。温跃层以及上、下均匀层位置的改变也能使声场能量分布发生明显变化。声源位于跃层之上的均匀层中时声源深度附近的声能明显增强,而声源位于跃层中时整个水柱范围内的声能迅速衰减。

Simulation for Acoustic Channel Influenced by Shallow Water Thermocline

Varieties of sound speed profile(SSP) structure in thermocline have a great influence on the shallow water channel.Under the different conditions of thermline intensity and position,the features of shallow channel were simulated and analyzed respectively based on Kraken normal mode model.The sensitivity of transmission loss(TL) to thermline eigenvalues was also discussed.The simulated result shows,TL in the entire water volume is growing with thermocline intensity.The position varieties of thermocline and upper and lower homogeneous layers can also induce a great change of energy field.The TL increases obviously when the source in depth of homogeneous layer,but decreases in the thermocline.