Three-dimensional CSAMT Forward Modeling of Potential Landslide Sliding Surfaces Using Finite Element Method

IF 0.7 4区 地球科学 Q4 GEOCHEMISTRY & GEOPHYSICS
Ruo Wang, Qingyun Di, Da Lei, Changmin Fu, Pengfei Liang, Miaoyue Wang
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引用次数: 0

Abstract

Landslides are a type of natural disaster that can cause substantial harm to humanity. Monitoring and predicting the initiation of potential landslides is critical to avoiding losses due to disasters and economic activities. The impact of the controlled-source audio-frequency magnetotelluric method on investigating landslide surfaces is assessed through numerical simulations with a finite element approach. A Dirichlet boundary condition is selected to match the truncated boundary, resulting in a remarkable improvement in simulation efficiency. Rederivation of the formulas for a layered medium adept to the controlled-source audio-frequency magnetotelluric method is necessary to determine the electromagnetic field at any location along the truncated boundary. After the reliability evaluation of the new codes, a landslide model with a slide surface is designed, and the characteristics of its electromagnetic field and the apparent resistivity are studied. Instead of the total electromagnetic field, which is strongly influenced by topography variation, the apparent resistivity should be used for sliding surface detection. The normalized pure anomalous electromagnetic field may also be employed to quickly assess the detectability of the sliding surface. Overall, this study demonstrates that the controlled-source audio-frequency magnetotelluric method can be employed for investigating landslides, and recommends survey parameters, including configuration, frequency range, and length of survey line in landslide exploration.

利用有限元法建立潜在滑坡滑动面的三维 CSAMT 正演模型
山体滑坡是一种可对人类造成重大伤害的自然灾害。监测和预测潜在滑坡的发生对于避免灾害和经济活动造成的损失至关重要。通过使用有限元方法进行数值模拟,评估了受控源音频磁无线电方法对调查滑坡表面的影响。选择了 Dirichlet 边界条件来匹配截断边界,从而显著提高了模拟效率。为了确定截断边界上任何位置的电磁场,有必要重新演绎适合受控源音频-频率磁法的分层介质公式。在对新代码进行可靠性评估后,设计了一个具有滑动面的滑坡模型,并研究了其电磁场和视电阻率的特征。滑动面检测应使用视电阻率,而不是受地形变化影响较大的总电磁场。归一化纯异常电磁场也可用于快速评估滑动面的可探测性。总之,本研究证明了受控源音频-频率磁电探测法可用于调查滑坡,并推荐了滑坡勘探中的勘测参数,包括配置、频率范围和勘测线长度。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Applied Geophysics
Applied Geophysics 地学-地球化学与地球物理
CiteScore
1.50
自引率
14.30%
发文量
912
审稿时长
2 months
期刊介绍: The journal is designed to provide an academic realm for a broad blend of academic and industry papers to promote rapid communication and exchange of ideas between Chinese and world-wide geophysicists. The publication covers the applications of geoscience, geophysics, and related disciplines in the fields of energy, resources, environment, disaster, engineering, information, military, and surveying.
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