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NKS Programme Area:NKS-B
Research Area:Radioecological assessments
Report Number:NKS-358
Report Title:Effects of dynamic behaviour of Nordic marine environment to radioecological assessments
Activity Acronym:EFMARE
Authors:Iosjpe M., Isaksson M., Joensen H.P., Jonsson G., Logemann K., Roos P., Suolanen V., Thomas R.,
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, comparison with previous results and testing of the influence of the time of an accident 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 improved version of the NRPA box model for the Baltic Sea. It is clear demonstration that dynamic modelling of the bioaccumulation processes can provide a more correct description of the concentration of radionuclides in biota and, therefore, 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 submodel. Also, kinetic modelling of bioaccumulation processes leads to a better harmonisation between the different end points calculations (for example, between 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 Icelandic waters was demonstrated and discussed. The results emphasize the necessity to use operational hydrodynamic ocean models in order to forecast pollutant dispersal in Icelandic waters. The use of particle density can be used for comparison with simulations from the NRPA box model.
Keywords:marine environment, hydrodynamic and box modelling, bioaccumulation submodel, accidents, radioecological consequences
Publication date:15 Febr 2016
ISBN:ISBN 978-87-7893-442-0
Number of downloads:248
Download:pdf NKS-358.pdf

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