In this study, we propose a simulation model for chlorine-ion diffusion using cellular automaton (CA), where mobile-water and immobile-water are postulated to exist in soil. Simulation results obtained from this proposed model are compared with those of observation by column experiment to verify the applicability of the model for soil pollution phenomena. The model could be reproduced tailig phenomena in breakthrough curves, and estimated distribution of immobile water in the soil column. It is shown that the complexity phenomena such as diffusion of soil pollution can be simulated simply and precisely by CA model more simply than numerical analysis.
