MIKE SHE AD is able to simulate solute transport in fractured media under some simplifying conditions. If we assume that water flows only in the fractures and that solutes can enter into the soil matrix as immobile solutes the advection-dispersion equation changes to:
(33.15)
where c is the concentration of the solute, subscripts m and im are for mobile and immobile, respectively, Rc is the sources or sinks, Dij is the dispersion tensor and vi is the velocity tensor determined from fracture porosity.
The exchange of mass between the mobile water phase in the fractures and immobile water phase is described by the traditional diffusion equation:
where b is the diffusion coefficient.
Diffusive exchange is included as a distributed source/sink term in the basic advection-dispersion equation.
