混合ADI-FDTD亚网格技术在探地雷达频散媒质中的高效正演
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Release time:2019-11-22 Impact Factor:0.829 DOI number:10.6038/cjg20140429 Affiliation of Author(s):中南大学地球科学与信息物理学院 Teaching and Research Group:应用地球物理系 Journal:地球物理学报 Place of Publication:中国 Funded by:41074085，NCET-12-0551 Key Words:探地雷达; 混合交替方向隐式有限差分法; 亚网格技术; 频散介质; 正演模拟 Abstract:提出混合ADI-FDTD亚网格技术开展频散介质GPR正演,即在物性参数变化剧烈局部区域采用细网格剖分ADI-FDTD计算,其他的区域采用粗网格剖分常规FDTD计算,ADI-FDTD突破了CFL条件的限制,可选取与粗网格一致的大时间步长,有效地提高了计算效率.本文首先基于Debye方程,推导了粗网格FDTD及细网格ADI-FDTD频散介质差分格式,着重对粗细两种网格结合的场值交换方式进行了深入探讨,给出了该算法的计算流程.然后以一个薄层模型为例,分别应用粗网格、细网格、混合ADI-FDTD亚网格算法对该模型进行正演,计算资源的占用及模拟精度说明了混合ADI-FDTD亚网格算法的优势.最后,建立频散介质与非频散介质的组合模型,应用3种方法对该模型进行正演,对比3种方法优劣,分析雷达剖面中非频散介质及频散介质中波形特征,有效地指导雷达资料的精确解释. Co-author:冯德山, 陈佳维, 吴奇 Indexed by:Applied Research Document Code:DOI：10.6038/cjg20140429 Discipline:地质资源与地质工程 Document Type:J Volume:57 Issue:4 Page Number:1322-1334 ISSN No.:0001-5733 Translation or Not:no Date of Publication:2014-04-05 Included Journals:SCI -
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