transport models surface water groundwater models chemical reaction models simple well documented nature modflow application finite element models finite element programs flexible design triangular elements vs block elements finite difference models use programs available sutra density dependent flow model usgs hydrus commercial unsaturated flow model feflow commercial modelling environment subsurface flow solute heat transport processes opengeosys scientific open source project thermo hydro mechanical chemical thmc processes porous fractured media comsol multiphysics
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