ESTIMATION OF DIOXIN FLUX DURING THE PAST 50 YEARS IN TOKYO BAY USING THE NUMERICAL MODEL

Abstract

 Object of this study is to predict distribution of dioxins deposited on the bottom of Tokyo Bay by means of a 3-dimensional flow model (a Hybrid Box Model) linked with a diffusion model. On the basis of the load fluxes from rivers during 50 years, the distribution of concentration in seawater and mass of dioxins sedimentation to the bottom of the bay were calculated by the models. Results were compared to the published observation data in order to examine applicability of the used models. Estimated dioxins concentrations in the sediment show good agreement with the observed data.