海底沉积层中高阶界面波对多掩埋物散射分析

Analysis of scattering of higher modes interface wave from buried multi-objects in sediment

根据界面波散射迭代公式,并利用含多个异质体弹性动力学的散射积分方程,引出海底沉积层中界面波高阶模式对掩埋物的散射情况。根据建立的分层海底模型,对沉积层中传播的界面波进行模式分解。利用界面波传播的Green函数构建界面波散射迭代积分,并根据弹性波对多异质体散射理论,将界面波散射积分推广到对多目标的散射情况。由模式分解的结果,求解出了前三阶界面波对多目标的散射情况,并对界面波高阶模式传播及对不同目标的散射情况做了分析。

Based on the interative equation for scattering of interface wave and the integral equation of the scattering wavefield associated with multi-inhomogeneities, this paper analyzes the higher modes interface wave scattering field from buried objects in seabed sediment. Within the framework of the stratified-sediment model, the propagation modes of the interface wave are analyzed. The Green＇s function of the interface wave is used to establish the integral equation for scattering. And the interface wave scattering method could be spread to calculate interface wave scattering from many buried objects, based on the elastic wave scattering associated with multi-inhomogeneities. In this paper, the first three orders of the interface wave in the sediment are solved, and the scattering wavefield of each mode is researched separately.