【摘要】 利用弹性抛物方程理论中的单向散射近似法处理倾斜弹性体-弹性体的边界条件,建立了不同地形条件下具有弹性分层海底的海洋环境中声场计算的新方法;经仿真分析等深度均匀海水层覆盖下具有倾斜弹性体-弹性体边界的弹性分层海洋环境中低频声场的空间分布结构,表明当弹性沉积层中纵波波速不大于1.5倍水中声速时,声压传播损失完全由海水介质参数和海底底质决定,与沉积层下界面地形关系不大,且弹性界面处有明显的界面波(Stoneley波)存在,即弹性体-弹性体界面的地形变化,基本不影响海水中的声场分布。与能量守恒方法相比较,仿真验证了文中计算方法的准确性。更多还原

【Abstract】 Based on the elastic parabolic equation,the elastic-elastic interface problem is studied via the single-scattering approximation method.The elastic-elastic interfaces are with different slopes and the seafloor(i.e.the interface between water and sediment) is flat.The underwater sound fields in such environments are calculated by the presented method.The distribution of low frequency sound field with a sloped elastic-elastic interface covered by horizontal stratified water is given.The simulations show that the sound field in the water is not influenced by the shape of elastic-elastic interface as long as the compressional wave speed in sediments is not greater than 1.5 times of the sound speed in water.更多还原