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LNAPL migration processes based on time-lapse electrical resistivity tomography.

Zhi-Ping Li1, Yu Liu2, Gui-Zhang Zhao2

  • 1North China University of Water Resources and Electric Power, Zhengzhou, Henan 450045, China; Henan Quality Institute, Ping, Pingdingshan, Henan 467000, China.

Journal of Contaminant Hydrology
|November 3, 2023
PubMed
Summary

Time-lapse electrical resistivity tomography effectively monitors light non-aqueous phase liquid (LNAPL) migration. This geophysical method reveals LNAPL movement patterns and distribution, aiding in understanding and remediating contamination.

Keywords:
Groundwater level fluctuationsLNAPLMigration mechanismTime-lapse electrical resistivity tomography

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Area of Science:

  • Environmental Geophysics
  • Hydrogeology
  • Contaminant Transport

Background:

  • Light non-aqueous phase liquid (LNAPL) contamination poses significant environmental and health risks.
  • Conventional methods struggle to monitor LNAPL migration and redistribution during groundwater fluctuations in real-time.
  • There is a need for efficient, rapid, and in-situ techniques to assess LNAPL contamination.

Purpose of the Study:

  • To investigate LNAPL migration mechanisms under various hydrological conditions using time-lapse electrical resistivity tomography (TL-ERT).
  • To establish a relationship between electrical resistivity and LNAPL/water content for quantitative analysis.
  • To characterize LNAPL distribution and migration pathways in unsaturated soil environments.

Main Methods:

  • Application of time-lapse electrical resistivity tomography (TL-ERT) to monitor LNAPL migration.
  • Development of a mathematical model to correlate resistivity with water and oil content.
  • Inverse calculation of LNAPL content from resistivity data for spatial distribution mapping.

Main Results:

  • TL-ERT successfully visualized LNAPL migration in a 'concave' shape under different conditions.
  • Groundwater presence significantly impeded LNAPL downward migration, forming a floating oil band.
  • LNAPL content was highest at the source, obstructed zones, and the soil column base.

Conclusions:

  • TL-ERT is a powerful geophysical tool for characterizing LNAPL migration processes and distribution.
  • The study enhances understanding of LNAPL behavior, crucial for effective remediation strategies.
  • This technique offers significant potential for monitoring and managing LNAPL-contaminated sites.