GPR velocity correction method in transversely heterogeneous media based on CMP data

IF 1.1 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS Near Surface Geophysics Pub Date : 2023-10-29 DOI:10.1002/nsg.12278
Jianyu Ling, Rongyi Qian, Jun Zhang, Zhenning Ma, Xu Liu
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Abstract

Abstract Determining of ground‐penetrating radar (GPR) velocity has always been a critical problem. The GPR velocity estimation method based on common midpoint (CMP) data has been widely used because of its simplicity. However, we found that in sediment investigation and soil assessment, transversal heterogeneity is universal, which violates the basic assumption of velocity estimation through CMP data. Due to the rapid change of underground media and the limitation of the scope of some surveying areas, the CMP survey line will inevitably be selected in the area where the velocity changes laterally, making it difficult to obtain accurate velocity. To address this problem, we propose a velocity correction method. First, we determined the characteristics of CMP data and the corresponding velocity spectra acquired in transversely heterogeneous media through numerical simulations. Subsequently, we found that the simulated CMP data could determine the location of changes in the underground medium and that the velocity obtained from the semblance analysis could be corrected according to the location where the medium changes laterally. We then used models wherein the thickness, relative permittivity, and proportion of abnormal parts varied independently or simultaneously to verify the proposed velocity correction method. The results show that our method can control the GPR velocity error within 3.44% and the precision is about 0.002 m/ns. Finally, we conducted a sediment investigation experiment on a channel bar in the lower reaches of the Yarlung Zangbo River. We determined the interface at which the sediment changed transversely and obtained the corresponding electromagnetic (EM) velocity using the proposed method. This study provides a reliable method for determining the GPR velocity in transversal heterogeneous media, which is of great significance for various practical applications. This article is protected by copyright. All rights reserved
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基于CMP数据的横向非均匀介质探地雷达速度校正方法
摘要探地雷达测速一直是一个关键问题。基于共中点(CMP)数据的探地雷达速度估计方法因其简单易行而得到了广泛的应用。然而,我们发现在沉积物调查和土壤评价中,横向非均质性是普遍存在的,这违背了通过CMP数据估算速度的基本假设。由于地下介质的快速变化和一些测量区域范围的限制,CMP测量线不可避免地会选择在速度横向变化的区域,难以获得准确的速度。为了解决这个问题,我们提出了一种速度校正方法。首先,通过数值模拟确定了横向非均质介质中CMP数据的特征和相应的速度谱。随后,我们发现模拟CMP数据可以确定地下介质变化的位置,并且可以根据介质横向变化的位置对相似分析得到的速度进行校正。然后,我们使用厚度、相对介电常数和异常部分比例独立或同时变化的模型来验证所提出的速度校正方法。结果表明,该方法可将探地雷达速度误差控制在3.44%以内,精度约为0.002 m/ns。最后,在雅鲁藏布江下游河道沙坝上进行了泥沙调查试验。利用该方法确定了沉积物横向变化的界面,并得到了相应的电磁速度。该研究为横向非均质介质中探地雷达速度的确定提供了一种可靠的方法,对各种实际应用具有重要意义。这篇文章受版权保护。版权所有
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来源期刊
Near Surface Geophysics
Near Surface Geophysics 地学-地球化学与地球物理
CiteScore
3.60
自引率
12.50%
发文量
42
审稿时长
6-12 weeks
期刊介绍: Near Surface Geophysics is an international journal for the publication of research and development in geophysics applied to near surface. It places emphasis on geological, hydrogeological, geotechnical, environmental, engineering, mining, archaeological, agricultural and other applications of geophysics as well as physical soil and rock properties. Geophysical and geoscientific case histories with innovative use of geophysical techniques are welcome, which may include improvements on instrumentation, measurements, data acquisition and processing, modelling, inversion, interpretation, project management and multidisciplinary use. The papers should also be understandable to those who use geophysical data but are not necessarily geophysicists.
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