152-Analysis of Concentration Profiles for Reactive Transport in Fractured Porous Media.

Abstract

Transport of reactive chemicals in a fractured porous media is affected by various factors such as sorption, degradation and physical process of advection and dispersion. In this study we investigate effect of first-order mass transfer coefficient, equilibrium sorption, first-order reverse sorption rate coefficient and matrix porosity on spatial and temporal concentration profiles of the solute in fracture. An advective-dispersive-reactive transport equation has been used for porous media, and an advective-dispersive transport equation has been used for the fracture. An implicit finite difference technique has been used for the numerical solutions of governing equations of saturated fracture-matrix system. It was found that the higher values of mass transfer coefficient, sorption coefficient, and matrix diffusion coefficient and matrix porosity decrease the solute concentration in fracture with increase in travel time. Also, large value of half fracture spacing increases the temporal and spatial solute concentration in fracture.