摘要
采用高精度交错网格有限差分法,建立了在起伏地表条件下瑞雷面波数值模拟的自由边界条件,通过对倾斜二层模型模拟的结果与解析解对比,二者完全一致,由此证明了起伏地表下瑞雷面波数值模拟的正确性。在此基础之上,模拟并分析了小凸起与小凹陷模型条件下,瑞雷面波的波场传播特征。通过分析得出瑞雷面波在这二种地形传播时,都存在反射、波型转换,以及能量再分配。因此,在起伏地表条件下,利用瑞雷面波进行勘探时要考虑起伏地表对瑞雷面波波场的影响。
A free surface condition for Numerical Simulation of Rayleigh wave has been built by using high precision staggered grids finite difference.The result of two inclined layer model simulating shows that error between numerical and analytic solutions is almost equivalent,which proves that Numerical Simulation of Rayleigh wave based on irregular topography is correct.Basis on this,we have got the propagation characteristics of Rayleigh wave from modeling a small heave topography and a small depressed topography models.Finding that there are reflection,waveform transformation and re-allocation of energy in the course of passing topography.Therefore,the effect of irregular topography must be considered when Rayleigh surface wave exploration is used.
出处
《物探化探计算技术》
CAS
CSCD
2010年第5期470-475,共6页
Computing Techniques For Geophysical and Geochemical Exploration
关键词
起伏地表
瑞雷面波
交错网格有限差分
正演模拟
irregular topography
rayleigh surface wave
staggered grid finite difference
forward modeling
