6:15 PM - 7:30 PM
[MAG38-P02] Modeling of downward percolation and prediction of concentration of the radionuclide in soil by ADE
Keywords:Advection Diffusion Equation, Downward percolation in soil, The accident at the Fukushima First Nuclear Power Plant, Radioactive Cesium
For this ADE model, Robin boundary condition is used. Robin boundary condition is that the inflow and outflow of the radionuclide on a boundary surface does not happen. So, it is the downward percolation model while keeping the total volume of the concentration fixedly. However, it is difficult to think that the inflow and outflow in a ground surface do not happen at all. So in this study, by aiming at Robin boundary condition, we improve the ADE model. We derive the analysis solution when we use ADE as governing equation and Robin boundary condition that was generalized as condition at a boundary surface. From this, we propose the new ADE model including the case that the inflow and outflow happen in a ground surface. Here, we compare our model with the data of concentration of Cs-137 in Fukushima soil to inspect the validity of this new model. Then, we get the result that our model follow the date well.