Transport processes

Looking to model transport processes from leachtes produced from fly ash lagoons! Well, I have to say that three processes are involved:

1- Advection
2- Hydrodynamic dispersion
3- Chemical recations

For modelling we need to right mass balance equation. It is very simple. The solution depends on your assumptions and it can be a simple diffusion equation to a 3D complex equation. For more details you can read Groundwater by Freeze.