Electrical resistivity tomography and numerical simulation of DNAPL infiltration process in three-dimensional sand box

JIANG Jun-jie; CAO Wen-han; LIU Han-le

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China Environmental Science ›› 2025, Vol. 45 ›› Issue (5) : 2513-2519.

Water Pollution Control

Electrical resistivity tomography and numerical simulation of DNAPL infiltration process in three-dimensional sand box

JIANG Jun-jie, CAO Wen-han, LIU Han-le

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Abstract

This research conducted an experiment on DNAPL contamination in a saturated porous medium within a threedimensional sandbox and performed synchronized dynamic monitoring using electrical resistivity tomography (ERT). The resistivity images obtained from ERT were used to determine the spatial distribution of DNAPL contaminants, which were then compared with the numerical simulation model established in the sandbox experiment. The absolute value of the relative error in the diameter of the DNAPL distribution area obtained from the numerical simulation and the DNAPL distribution area determined by the ERT monitoring ranged from 2.00% to 27.50% across different spatial locations.The absolute value of the relative error in the diameter of the DNAPL distribution area obtained from the numerical simulation and the DNAPL distribution area determined by the ERT monitoring ranged from 2.7% to 40.58% at different time points. The results demonstrate the feasibility of using the numerical simulation software Petrasim to predict the distribution range of DNAPL contamination in saturated sandy soil.

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DNAPL / electrical resistivity tomography / numerical simulation / saturated sand

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JIANG Jun-jie, CAO Wen-han, LIU Han-le. Electrical resistivity tomography and numerical simulation of DNAPL infiltration process in three-dimensional sand box[J]. China Environmental Science. 2025, 45(5): 2513-2519

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