起伏地表条件下坐标变换的瑞雷波场正演模拟  

The study of modelling of Rayleigh waves under undulating surface topography

作　　者：江凡[1] 

机构地区：[1]福建工程学院土木工程学院,福建福州350118

出　　处：《福建工程学院学报》2013年第1期14-18,57,共6页Journal of Fujian University of Technology

基　　金：福建省高校专项基金项目(JK2011034);福建工程学院科研启动基金(GY-Z10068);福建工程学院科研发展基金项目(GY-Z10072)

摘　　要：利用高精度交错网格有限差分技术模拟起伏地表条件下的瑞雷波全波场正演,通过坐标变换的方式实现起伏地表自由边界条件。与一个已知模型结果对比,验证该算法的可行性与正确性,并通过在一个地表起伏的均匀介质中瑞雷波的模拟,结果说明了该方法的适应性。两个模型的模拟结果均表明,即使是地下室均一的介质,但由于地表起伏的存在不可避免地会产生波型的转换与能量的再分配,瑞雷波波场必然受到一定的影响。High-order staggered-grid finite-difference operators were used to simulate the whole wave field of Rayleigh waves under undulating surface topography. The free surface boundary conditionas were fulfilled by coordinate transformation. The feasibility of the high-order staggered-grid finite- difference calculating algorithm was validated by comparing with the results of a known model. The suitability of the algorithm was shown by Rayleigh wave simulation in homogeneous medium under undulating surface topography. The results indicate that the waveform changes and energy redistribu- tion due to undulating surface may affect Rayleigh wave field.

关 键 词：瑞雷波 起伏地表 交错网格 有限差分 坐标变换 

分 类 号：TU435[建筑科学—岩土工程] P642.27[建筑科学—土工工程]