The dispersion of 137Cs released from Fukushima nuclear power plant to the sea after the March 11th
2011 tsunami has been studied using numerical models. The 3D dispersion model consists of an advec tion/diffusion equation with terms describing uptake/release reactions between water and seabed sedi ments. The dispersion model has been fed with daily currents provided by HYCOM and JCOPE2 ocean
models. Seabed sediment 137Cs patterns obtained using both current data set have been compared.
The impact of tides and of atmospheric deposition has been evaluated as well. It has been also found that
a 2-step kinetic model (two consecutive reversible reactions) for describing water/sediment interactions
produces better results than a 1-step model (one single reversible reactio
