Appendix A5

The simulations presented in this report were carried out with the computer code FLOTRAN, written by Peter Lichtner (Lichtner 2004). FLOTRAN can simulate time-dependent, coupled thermalhydrologic- chemical processes in variably saturated, non-isothermal porous media in up to three spatial dimensions. FLOTRAN calculates multi-component reactive transport involving aqueous, mineral or gaseous species. It can also be used for systems involving two-phase flow, that is systems containing a liquid and a gaseous phase, such as in the unsaturated zone above the water table, and for systems consisting of fractured porous media. Both Cartesian and cylindrical model geometries can be used.

Natural Tracer Profiles Across Argillaceous Formations: The CLAYTRAC Project

Appendix A5

Documentation of the Numeric Code Flotran