Improving the imaging capabilities of modern portable loop-loop electromagnetic induction (EMI) systems using ground-penetrating radar (GPR) data
使用探地雷达 (GPR) 数据提高现代便携式环路电磁感应 (EMI) 系统的成像能力
基本信息
- 批准号:418056756
- 负责人:
- 金额:--
- 依托单位:
- 依托单位国家:德国
- 项目类别:Research Grants
- 财政年份:2019
- 资助国家:德国
- 起止时间:2018-12-31 至 2022-12-31
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
In near-surface geophysical applications, portable loop-loop electromagnetic induction (EMI) sensors are increasingly used to rapidly image the electrical conductivity of the uppermost meters of the subsurface across rather large areas (several hectares). The resulting 3D models of electrical conductivity can serve to characterize a large selection of targets because many rocks, soil layers and anthropogenic materials show contrast of electrical conductivity. However, because electrical conductivity of subsurface materials is influenced by many different soil and rock properties, the interpretation of the EMI electrical conductivity models is often complex and non-unique; especially, in contexts where no reliable background information about the imaged subsurface is available. Moreover, even if the nature of the targets is known, EMI data are limited in terms of their structural resolution capabilities because each measurement is sensitive to an integrated volume of subsurface.The ground-penetrating radar (GPR) method is another popular near-surface imaging method. As a wave-based imaging technique, which is sensitive to dielectric permittivity contrasts, GPR is typically considered as the geophysical method providing the highest structural resolution. However, a more quantitative analysis in terms of physical property models is often limited with typical 2D/3D GPR reflection data. Although both EMI and GPR methods are used to explore similar depth ranges, they have never been combined in the framework of a quantitative integrated imaging/inversion procedure. Considering weaknesses and strengths of each method and that they can provide complementary information, we hypothesize that a quantitative integration results in an improved characterization of subsurface structures and properties. In this project, we propose to develop and evaluate approaches for quantitively combining EMI and GPR data in order to reduce the classical ambiguities and resolution limitations encountered when using the EMI method only. In doing so, we will first study the typical non-uniqueness of the EMI methods by comparing three different EMI data inversion strategies on several types of controlled targets. Then, we will focus on incorporating the structures as derived from GPR data into the inversion of EMI data, and study how such a strategy helps to reduce the non-uniqueness of the inverted EMI models. In this respect, we will develop and evaluate two constrained inversion strategies: one deterministic grid-based approach, which was recently reported in the literature for larger scale problems, and one stochastic parametric approach. Thus, we expect from this project general conclusion regarding the possibilities of combining EMI and GPR data as well as methodological innovations regarding EMI data inversion further improving the imaging capabilities and the applicability of the EMI method.
在近地表地球物理应用中,便携式环-环电磁感应(EMI)传感器越来越多地用于对相当大的区域(几公顷)的地下最上层米的电导率进行快速成像。由此产生的电导率的3D模型可以用来表征大量的目标,因为许多岩石,土壤层和人为材料显示出电导率的对比度。然而,由于地下材料的电导率受许多不同的土壤和岩石性质的影响,EMI电导率模型的解释往往是复杂的和非唯一的,特别是在没有可靠的背景信息成像的地下是可用的。此外,即使目标的性质是已知的,电磁干扰数据是有限的,因为它们的结构分辨率的能力,每个测量是敏感的地下的积分体积。探地雷达作为一种对介电常数差异敏感的波基成像技术,被认为是目前构造分辨率最高的地球物理方法。然而,在物理属性模型方面的更定量的分析通常受限于典型的2D/3D GPR反射数据。虽然电磁干扰和探地雷达方法都用于探索类似的深度范围,但它们从未在定量综合成像/反演程序的框架内结合起来。考虑到每种方法的弱点和优势,它们可以提供互补的信息,我们假设,定量整合的结果在一个改进的表征地下结构和性能。在这个项目中,我们建议开发和评估方法,定量结合EMI和GPR数据,以减少经典的模糊性和分辨率的限制时,只使用EMI方法。在这样做时,我们将首先研究典型的非唯一性的EMI方法,通过比较三种不同的EMI数据反演策略对几种类型的受控目标。然后,我们将专注于将来自GPR数据的结构纳入EMI数据的反演,并研究这样的策略如何有助于减少反演EMI模型的非唯一性。在这方面,我们将开发和评估两个约束反演策略:一个确定性的基于网格的方法,这是最近在文献中报道的较大规模的问题,和一个随机参数的方法。因此,我们期望从这个项目的一般结论,结合EMI和GPR数据的可能性,以及方法创新的EMI数据反演进一步提高成像能力和EMI方法的适用性。
项目成果
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Dr. Julien Guillemoteau, Ph.D.其他文献
Dr. Julien Guillemoteau, Ph.D.的其他文献
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