Effective Porosity Analysis in Low-Permeability Porous Media

1.0. Introduction: The transport through the porous medium leads the contaminant to spread into the other fluid medium. Low-permeability media (LPPM) is most commonly associated with fine-grained sedimentary deposits such as shales and clays. Groundwater flow in these environments appears to affect the development of geologic, hydrologic, and geochemical systems. Low-permeability clay layer interfaces are generally involved at waste disposal sites as the purpose of reducing the risk of groundwater contamination. For clay media have typically a hydraulic conductivity less than 10-7 cms-1 [1]. Overall, low permeability media might play a significantly important role not only in the groundwater flow process but also for the solute transport process. This short review provides an insight into series of homogeneous medium transport experiments in one-dimensional columns (length 3cm to 10 cm) for transport and the leaching process conducted which NaCl was chosen as a Tracer [2]. The modeling approaches was used the Advection-Dispersion Equation (ADE), Fractional Advection-Dispersion Equation (FADE), Two-Region Model (TRM), and the Continuous Times Random Walk (CTRW) theory. The effective porosity can be calculated as ne=q/v, in which q is the Darcian velocity, while v is the actual flow velocity. The velocities estimated from ADE during this process were used to calculate the effective porosity. For the leaching process, the velocities estimated from FADE were used as the FADE has a perfect agreement with the experimental data [2].