抄録
In the present paper, the simulation results of infiltration of trichloroethylene from the natural river bed to groundwater region is shown. The method of characteristics (MOC) and iterated alternating direction implicit method (IADI) was applied to the computation of two-dimensional convection-dispersion equation and groundwater flow equation. It was found that the infiltration from the river bed when the groundwater level was high in the steady state becomes large while small when the level was low. In the transient period of the groundwater table from high to low or from low to high levels, spread of trichloroethylene showed an opposite tendency due to the unsteady velocity field which contributes to the convection of mass transport.
