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一项关于使用ERT监测轻非水相液体迁移的研究。

A study on the monitoring of LNAPL migration using ERT.

作者信息

Suo Kui, Zhao Mingdong, Liu Yu, Liu Hongwei, Jia Menghan

机构信息

North China University of Water Resources and Electric Power, Zhengzhou City, Henan Province, P.R. China.

Zhongsheng Environmental Science and technology Development Co., LTD, Xi'an, Shaanxi Province, P.R. China.

出版信息

PLoS One. 2025 Jan 24;20(1):e0315624. doi: 10.1371/journal.pone.0315624. eCollection 2025.

DOI:10.1371/journal.pone.0315624
PMID:39854447
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11759388/
Abstract

This study employs electrical resistivity tomography (ERT) to experimentally investigate the migration characteristics of light non-aqueous phase liquids (LNAPL) under various groundwater conditions. Through cross-hole measurements and time-lapse inversion, the migration process of LNAPL under three scenarios-unsaturated conditions, constant groundwater levels, and declining water levels-was systematically analyzed. The results indicate that LNAPL migration behavior exhibits significant differences under different conditions. Under unsaturated conditions, the vertical migration rate of LNAPL gradually decreases over time, with an average rate of 1.06 cm/h, and is influenced by preferential migration pathways formed in coarse-grained regions. At constant water levels, the migration of LNAPL is significantly constrained by the groundwater level, spreading horizontally near the water table after reaching it, with an average rate of 0.51 cm/h. When the groundwater level declines, LNAPL migrates rapidly downward along preferential flow paths, with an average rate increasing to 1.45 cm/h. Miller Soil Box experiments further reveal the relationship between LNAPL content and electrical resistivity, showing that an increase in LNAPL can significantly alter soil resistivity, especially under low moisture conditions. Overall, this study confirms the monitoring advantages of ERT technology for LNAPL migration behavior under different conditions and provides important references for remediation strategies at contaminated sites.

摘要

本研究采用电阻率层析成像（ERT）技术，通过实验研究轻质非水相液体（LNAPL）在各种地下水条件下的迁移特性。通过跨孔测量和时间推移反演，系统分析了LNAPL在非饱和条件、地下水位恒定和地下水位下降三种情况下的迁移过程。结果表明，LNAPL在不同条件下的迁移行为存在显著差异。在非饱和条件下，LNAPL的垂直迁移速率随时间逐渐降低，平均速率为1.06厘米/小时，且受粗粒区域形成的优先迁移路径影响。在地下水位恒定时，LNAPL的迁移受到地下水位的显著限制，到达地下水位后在其附近水平扩散，平均速率为0.51厘米/小时。当地下水位下降时，LNAPL沿优先流动路径迅速向下迁移，平均速率增至1.45厘米/小时。米勒土箱实验进一步揭示了LNAPL含量与电阻率之间的关系，表明LNAPL的增加可显著改变土壤电阻率，尤其是在低湿度条件下。总体而言，本研究证实了ERT技术对不同条件下LNAPL迁移行为的监测优势，并为污染场地的修复策略提供了重要参考。

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本文引用的文献

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LNAPL migration processes based on time-lapse electrical resistivity tomography.基于时移电阻率层析成像的 LNAPL 运移过程。
J Contam Hydrol. 2023 Nov;259:104260. doi: 10.1016/j.jconhyd.2023.104260. Epub 2023 Oct 30.
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Temperature and Humidity Stability of Fibre Optic Sensor Cables for High Resolution Measurements.用于高分辨率测量的光纤传感器电缆的温度和湿度稳定性。
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非均质土层中原油的三维运移及电阻率特性。
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