Our Portfolio: Monitoring Projects

CMST Index | Monitoring | SCFA

Electrical Impedance Tomography (EIT) for DNAPL Delineation in the Subsurface

Information
Resources

Technology
Summary Sheet

Images

 

Tech ID: 2121
Project Overview
Electrical Impedance Tomography (EIT) reconstructs the subsurface 3-D electrical impedance field tomographically from measurements of the impedence between pairs of points. The impedance is measured at several frequencies. DNAPL location can be inferred from the frequency dependence of the reconstructed impedance fields. This is an outgrowth of Electrical Resistance Tomography (TechID 17), used in monitoring environmental remediation operations such as soil heating and dynamic underground stripping as well as subsurface barrier integrity.
Technology Description
Electrical Impedance Tomography (EIT) images the distribution of soil impedance at two frequencies. The difference of the two images eliminates most parameters relating to soil and rock composition and structure leaving a direct 3-D picture of dense nonaqueous phase liquids (DNAPLs) in the subsurface. Both electromagnetic magnitude and phase information is necessary for directly mapping contaminant DNAPL plumes in situ.

Return to Top