A dissolved radionuclide migration code system that consists of a ocean circulation model, Princeton Ocean Model, and the particle random-walk model SEA-GEARN has been developed. The oceanic migration of 137Cs discharged from a nuclear submarine in a hypothetical accident at the Tsushima Strait in the southwestern area of the Japan Sea was calculated as a model application. The calculations for instantaneous releases on different dates, every 10 days over one year, were carried out to study the seasonal differences of the migration process of the dissolved radionuclides. The migration tendencies of dissolved radionuclides were divided into two patterns. In the releases from January to September, all of the high concentration areas migrated to the northeast along the coastline of the Main Island of Japan from the release point. In the releases from October to December, some high concentration areas migrated to the west from the release point, and the concentration of 137Cs along the coastline of the Main Island of Japan was comparatively low. According to the calculation results with the parameters that we set, a good correlation coefficient R=0.718 was found between the number of particles which pass through the 134°E line and the inflow volume of the Tsushima Strait.
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Kobayashi et al. (2006) studied this question.