NUMERICAL ESTIMATION OF RADIONUCLIDE TRANSPORT IN THE ATMOSPHERE AND MARINE ENVIRONMENT AND ESTIMATION OF THE CONSEQUENCES OF THE NUCLEAR ACCIDENT IN CHAZHMA BIGHT OF THE SEA OF JAPAN

V. N. Soifer, V. A. Goryachev, V. I. Gurentsov, V. G. Makarov, and A. F. Sergeev

Fifteen years after a severe nuclear atomic submarine accident in Chazhma Bight its aftermath for the population, area, and adjoining water area was rather accurately estimated numerically. The estimate was of benefit to assess the damage injured and to develop measures for liquidation of the accidental consequences. The formalism of numerical calculations of radionuclide transport in Ussuri Bay (during the first month after the nuclear accident) from the point of the aerosol cloud fallout onto the bay water area was considered. The calculations were made with a three-dimensional diagnostic model for currents and the solution of a nonstationary three-dimensional equation of turbulent contamination diffusion in its complete statement. Required information on structure of density and wind fields was obtained for eight surveys performed in the bight in 1990–1992 in different seasons (spring, summer, and fall). The atmospheric transport of an accidental radioactive cloud over the Dunai Peninsula was reconstructed. The risks were evaluated for the population and cleanup workers.