Spreading of localized information across an entire 3D electrical resistivity volume via constrained EMI inversion based on a realistic prior distribution

Nicola Zaru, Matteo Rossi, Giuseppina Vacca, Giulio Vignoli

Research output: Contribution to journalArticleResearchpeer-review

3 Citations (Scopus)

Abstract

Frequency-domain electromagnetic induction (EMI) methods are commonly used to map vast areas quickly and with minimum logistical efforts. Unfortunately, they are often characterized by a very limited number of frequencies and severe ill-posedness. On the other hand, electrical resistivity tomography (ERT) approaches are usually considered more reliable; for example, they do not require specific calibration procedures and can be easily inverted in 2D/3D. However, ERT surveys are, by far, more demanding and time consuming, allowing for the deployment of a few acquisition lines per day. Ideally, the optimal would be to have the advantages of both approaches: ease of acquisition while keeping robustness and reliability. The present work raises from the necessity to cope with this issue and from the importance of enforcing realistic constraints to the data inversion without being limited to (over)simplistic spatial constraints (for example, characterizing the smooth and/or sharp regularization). Accordingly, the present research demonstrates, by means of synthetic and field data, how the EMI inversion—based on realistic prior models—can be further enhanced by incorporating additional pre-existing pieces of information. While the proposed scheme is quite general, in the specific examples discussed here, these additional pieces of information are, respectively, a reference model along a line across the survey area, and an ERT section. The field EMI results were verified against extensive ground penetrating radar (GPR) measurements and boreholes.

Original languageEnglish
Article number3993
Number of pages25
JournalRemote Sensing
Volume15
Issue number16
DOIs
Publication statusPublished - Aug 2023

Keywords

  • electrical resistivity tomography
  • electromagnetic induction
  • ground penetrating radar
  • realistic prior distribution
  • spatially constrained inversion

Programme Area

  • Programme Area 5: Nature and Climate

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