复杂地电模型的探地雷达时域有限差分正演
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Release time:2020-08-09 Affiliation of Author(s):中南大学地球科学与信息物理学院 Teaching and Research Group:中南大学应用地球物理系 Journal:物探化探计算技术 Place of Publication:中国 Funded by:50099620-03-02 Key Words:探地雷达；时域有限差分法；正演模拟；理想频散关系 Abstract:目前探地雷达正演模拟,都是针对简单的层状模型,圆状空洞,正方形空洞等单一的规则模型,而对于地下弯曲的界面或"V"字形等复杂模型的正演,实现起来较为困难.然而,地下构造是复杂的,因此,对复杂地电模型的正演研究显得更为重要.这里以麦克斯韦两个旋度方程为基本出发点,运用K.S.Yee的空间网格模型理论和时域有限差分法的基本原理,推导出二维空间的探地雷达正演方程组,通过讨论数值频散关系及其产生原因,推导出符合探地雷达实际传播规律的理想频散关系.为解决正演模拟时截断边界处的超强反射,采用了Mur超吸收边界条件,并以自制的探地雷达正演模拟程序为依托,对两个复杂的探地雷达模型进行了正演模拟,得到了正演剖面图.从其后模拟实例中的两正演剖面图可以看出,边界截断处的干扰波被大大地减少,消除边界反射后的雷达剖面能更好地指导工作人员进行地质解释,从而达到了把雷达的正演研究深入到复杂地电模型中去的目的,使正演研究更符合实际的地质情况. Co-author:冯德山, 戴前伟, 何继善 First Author:喻振华 Indexed by:Applied Research Document Code:1001-1749(2005)04-0279-05 Discipline:地质资源与地质工程 Document Type:J Volume:27 Issue:4 Page Number:11~15+5 ISSN No.:1001-1749 Translation or Not:no CN No.:51-1242/P Date of Publication:2005-11-28 -
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