Effects of dynamic behaviour of Nordic marine environment to radioecological assessments (EFMARE): Final Report for the NKS-B EFMARE activity 2015

Mikhail Iosjpe, Mats Isaksson, Hans Pauli Joensen, Gísli Jónsson, Kai Logemann, Per Roos, Vesa Suolanen, Thomas Rimon

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Abstract

The goal of the EFMARE project is an analysis of consequences of radioactive releases into marine environment with special attention to the effects of the dynamic behaviour of the Nordic seas to radioecological assessments.

The main goals for the EFMARE project is development and implementation of the bioaccumulation process into the models, improvement of the models, com-parison with previous results and testing of the influence of the time of an acci-dent for the radioecological consequences.

Results of implementation of the kinetic model for bioaccumulation processes into the NRPA box model and the DETRA computer code clearly demonstrated that there is a significant quantitative difference between the kinetic modelling approach and the approach based on the constant concentration rates.

Results of modelling were compared with experimental data on the basis of im-proved version of the NRPA box model for the Baltic Sea. It is clear demonstra-tion that dynamic modelling of the bioaccumulation processes can provide a more correct description of the concentration of radionuclides in biota and, there-fore, these results support the main goal of the EFMARE project.

It is shown that the improved modelling approach for radioecological assessment indicates significant differences between results based on constant concentration factors (CF) and the description of bioaccumulation process with a kinetic sub-model. Also, kinetic modelling of bioaccumulation processes leads to a better harmonisation between the different end points calculations (for example, be-tween doses to the critical group and concentrations in marine organisms for short-life radionuclides), and also to better logical explanations of the results.

With a numerical case study the temporal variability of pollutant dispersal in Ice-landic waters was demonstrated and discussed. The results emphasize the ne-cessity to use operational hydrodynamic ocean models in order to forecast pol-lutant dispersal in Icelandic waters.

The use of particle density can be used for comparison with simulations from the NRPA box model.
Original languageEnglish
Place of PublicationRoskilde
PublisherNKS-Nordic Nuclear Safety Research
Number of pages86
ISBN (Electronic)978-87-7893-442-0
Publication statusPublished - 2016

Publication series

NameNKS B
No.358

Keywords

  • marine environment
  • hydrodynamic and box modelling
  • bioaccumulation sub-model
  • accidents
  • radioecological consequences

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