Induced Polarization (IP) is a non-intrusive geophysical method to monitor Dense Non-Aqueous Phase Liquid (DNAPL) contamination and remediation processes underground. In this study, an advanced numerical code simulating DNAPL flow and complex electrical resistivity is presented. The model was validated against existing IP results and image measurements that were carried out previously in a series of 2D tank experiment. Multiphase flow modeling in porous media is coupled with electrical current modeling to simulate the process of DNAPL migration and the associated IP response. This brings a broader view of the contamination in space and time compared to surface and borehole measurements, especially when the results are supported by field measurements or laboratory experiments. The simulations are developed in 3D and are performed in COMSOL Multiphysics®. The simulations using petrophysical relationships for in-phase and quadrature resistivity and the results of the experiments are in complete accordance with each other in the parts of the tank where the saturation of DNAPL is relatively low (i.e. especially in the cone of depression in the pumping scenario). However, the parts associated with high saturation of DNAPL show high errors between the in-phase resistivity simulations and the results from experiments. The present work can be regarded as a preliminary study toward further applications of coupled IP-multiphase flow for more accurate detection and monitoring of DNAPLs. It is suggested that the choice of tool/approach in this study be extended to larger-scale studies for further investigation.

诱导极化(IP) 是一种非侵入式地球物理方法，用于监测稠密非水相液体 (DNAPL) 污染和地下修复过程。在这项研究中，提出了一种模拟 DNAPL 流动和复电阻率的高级数字代码。该模型已针对之前在一系列 2D 水箱实验中进行的现有 IP 结果和图像测量进行了验证。多孔介质中的多相流建模与电流建模相结合，以模拟 DNAPL 迁移过程和相关的 IP 响应。与地面和钻孔相比，这带来了更广泛的空间和时间污染视图测量，特别是当结果得到现场测量或实验室实验的支持时。仿真以 3D 形式开发，并在 COMSOL Multiphysics® 中执行。利用岩石物理关系对同相和正交电阻率的模拟与实验结果在水箱中 DNAPL 饱和度较低的部分（即特别是在抽水情况下的凹陷锥中）。然而，与 DNAPL 的高饱和度相关的部分在同相电阻率模拟和实验结果之间显示出很大的误差。目前的工作可被视为进一步应用耦合 IP 多相流以更准确地检测和监测 DNAPL 的初步研究。建议将本研究中工具/方法的选择扩展到更大规模的研究以进行进一步调查。