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Springer Geology

ISSN:21979545

2023

10.1007/978-3-031-16575-7_45

QMJYCT

The purpose of this work is to determine the initial Cs137 concentration field in the Black Sea immediately after the Chernobyl accident using spatially and time-distributed measurement data based on the adjoint equation method. The calculation of the flow velocities was carried out using a three-dimensional model of the Black Sea circulation MGI with a horizontal grid step of 1.6 km. When calculating the currents, the wind effect was set according to SKIRON data. The method of adjoint equations is used to determine the location of a possible radioactive fallout according to measurements that were carried out on the 33rd flight of the NIS “Akademik Vernadsky” in June-July 1986. The National Centers for Environmental Prediction (NCEP) data on the wind situation and precipitation intensity are analyzed. The information of the IRSN (Institute of Nuclear and Radiation Safety of France) on the processes of transfer of radioactive contamination from the Chernobyl nuclear power plant towards the Black Sea is considered. Based on the solution of the adjoint problem, a possible area of radioactive fallout was determined, the location of which coincides with IRSN data on areas of increased isotope concentration in the atmosphere over the Black Sea region in late April–early May 1986. © 2023, The Author(s), under exclusive license to Springer Nature Switzerland AG.

Adjoint problem, Cs137 concentration, Identification of pollution sources, Impurity transfer, Numerical modeling, Radioactive contamination

2023-01-27 12:29:24