Numerical simulation of dispersion and deposition of radioactive materials from the Fukushima Daiichi nuclear power plant in March of 2011

摘要

In order to know the detail of the deposition and distributions processes of radioactive materials emitted from the Fukushima Daiichi nuclear power plant after the nuclear accident accompanied the great Tohoku earthquake and tsunami on 11 March 2011, dispersion and deposition process of radioactive materials were simulated using a pair of numerical models, A2Cflow and A2Ct&d. The model reproduced clearly the observed spatial distributions of deposition amount in main part of East Japan. Although there were some discrepancies between the simulated amount and observed amount somewhere, the simulation can explain when and why the special distributions were formed. These discrepancies were likely due to uncertainties in the simulation of emission rate due to no detail information of the emission rate.