Imaging near surface formation using TEM and ERT methods: A case study from the western coast of India

IF 2.1 3区 地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY
Bhima Raju Kattula , Subash Chandra
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引用次数: 0

Abstract

The paper presents comparative performance of airborne electromagnetic (EM), ground-based EM and electrical resistivity tomography (ERT) methods for characterization of near-surface hydrogeological units of the Western coast of India. The electromagnetic data was acquired in time domain mode employing dual (low and high) moments technology, while the ERT data was obtained using multi-gradient arrays with 10 m electrode spacing. The early time gates of low moment (LM) data provide near-surface geological knowledge, whereas late time gate measurements of high moment (HM) data provide deeper information. Early time gate measurements of LM data corrected by primary field and system response help in utilizing a very early time gate starting from ∼4 μs that enhances near surface resolution. Formation resistivity derived from LM airborne transient electromagnetic (aTEM) data has been compared with ground-based transient electromagnetic (gTEM) and ERT data for resolving very near-surface features, especially the upper few meters, including soil. The study revealed that the performance of aTEM with system response corrections and on-time modelling is effective in comparison to gTEM, and consistent with those results from ERT of 10 m unit electrode spacing in resolving near-surface features. Thus, aTEM survey can contribute to hydrogeological applications dealing with shallow processes such as infiltration, and aquifer recharge studies.
用TEM和ERT方法成像近地表地层:以印度西海岸为例
本文介绍了航空电磁(EM)、地面电磁(EM)和电阻率层析成像(ERT)方法在印度西海岸近地表水文地质单元表征中的比较性能。电磁数据采集采用双(低、高)矩时域模式,ERT数据采集采用电极间距为10 m的多梯度阵列。低矩(LM)数据的早期时间门提供了近地表地质知识,而高矩(HM)数据的晚期时间门测量提供了更深入的信息。原始场和系统响应校正的LM数据的早期时间门测量有助于利用从~ 4 μs开始的非常早期时间门,提高近表面分辨率。利用LM机载瞬变电磁(aTEM)数据获得的地层电阻率与地面瞬变电磁(gTEM)和ERT数据进行了比较,以解决非常近地表特征,特别是上部几米,包括土壤。研究表明,与gTEM相比,具有系统响应校正和实时建模的aTEM在解析近地表特征方面的性能是有效的,并且与单位电极间距为10 m的ERT的结果一致。因此,aTEM调查有助于处理浅层过程的水文地质应用,如渗透和含水层补给研究。
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
Journal of Applied Geophysics
Journal of Applied Geophysics 地学-地球科学综合
CiteScore
3.60
自引率
10.00%
发文量
274
审稿时长
4 months
期刊介绍: The Journal of Applied Geophysics with its key objective of responding to pertinent and timely needs, places particular emphasis on methodological developments and innovative applications of geophysical techniques for addressing environmental, engineering, and hydrological problems. Related topical research in exploration geophysics and in soil and rock physics is also covered by the Journal of Applied Geophysics.
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