%0 Journal Article
%T 浅海舰船地震波场仿真中的边界处理
%A 朱旭芳
%A 颜冰
%A 马知远&lt
%A /br&gt
%A ZHU Xufang
%A YAN Bing
%A MA Zhiyuan
%J 国防科技大学学报
%D 2018
%R 10.11887/j.cn.201802014
%X 为解决舰船地震波场数值仿真中的边界反射问题，结合浅海传播环境特征和舰船地震波激发机理，提出边界处理算法。采用交错网格有限差分法对一阶速度-应力方程进行数值离散；采用应力镜像法处理海水和空气的自由表面，采用分裂式完全匹配层法处理区域边界；将该模型应用于平行海底近场、远场以及倾斜海底的波场仿真算例中。仿真结果表明：加入边界处理后，自由表面的吸收和区域边界的反射有效减少，波场特征清晰，该算法符合浅海舰船地震波场数值仿真的边界处理要求。</br>The stress image method and the perfect matching layer method were used to deal with the boundary problem of shallow water ship seismic wave field simulation. The algorithm fully considers the shallow water environment and the excitation mechanism of the seismic wave. Based on the first-order velocity-stress equation, staggered grid finite difference method was taken to discretize the equations. The stress mirror method was applied to deal with free surface of seawater and air. The split boundary perfectly matched layer method was applied to deal with the boundary of the computing area. The parallel and inclined seafloor seismic wave fields were computed. The results before and after were compared, which shows that if the boundary is not treated, serious reflection would cover up the original wave field characteristics, but after the treatment, each case of wave field wave line and wave propagation rules are quite clear. So this method completely conforms to the shallow water ship seismic wave field numerical simulation requirements.
%K 浅海 舰船地震波 有限差分 自由边界 吸收边界&lt
%K /br&gt
%K shallow sea ship seismic wave finite difference free boundary absorbing boundary
%U http://journal.nudt.edu.cn/gfkjdxxb/ch/reader/view_abstract.aspx?file_no=201802014&flag=1