Development and integration of simulation models for nearfield groundwater flow and radionuclide transport computation

Groundwater flow and radionuclide transport computations in nearfield heterogeneous porous media are carried out in the following way using continuum analysis model: 'TAGSAC' solves three-dimensional saturated/unsaturated groundwater flow equation in nearfield heterogeneous porous media using finite element method (FEM). 'TR3D' calculates streamlines by randomwalk particle tracking method according to potential distribution provided by TAGSAC. These streamlines are introduced into one-dimensional radionuclide transport analysis code 'CRYSTAL'. In this research, these processes were integrated into one system and all operation including data handling can be automatically done in this system. Pre-processing and post-processing procedure for modeling and visualization were also developed. Groundwater flow and radionuclide transport computations in nearfield heterogeneous porous media are carried out using this system. (author)