Institute of Information Theory and Automation

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Journal Article

Determination of radiological background fields designated for inverse modelling during atypical low wind speed meteorological episode

Pecha Petr, Tichý Ondřej, Pechová E.

: Atmospheric Environment vol.246, 118105

: GA20-27939S, GA ČR

: Low wind speed, Atmospheric dispersion, Radioactivity dissemination, Hot spot occurrence, Inverse modelling

: 10.1016/j.atmosenv.2020.118105

: http://library.utia.cas.cz/separaty/2021/AS/pecha-0537537.pdf

: https://www.sciencedirect.com/science/article/pii/S1352231020308372

(eng): This article focuses on the formation of complex trajectories of radiological background fields for atypical accidental discharges of radioactivity into the atmosphere during very low wind speed episodes (calms). Within several hours of a calm meteorological situation, a relatively significant level of radioactivity can be accumulated around the source. In the next stage, the calm situation is assumed to terminate and convective movement of the air immediately starts. A packet of accumulated radioactivity, which has the form of multiple Gaussian puffs, is drifted by wind. Consequently, the pollution is disseminated over the terrain. Significant transport of radioactivity even behind the protective zone of a nuclear facility (up to between 15 and 20 km) has been observed. Original optional statistical pre-processing of calm's results is inserted between the calm and convective stages of the trajectory generation which may improve performance of following computationally expensive methods of Bayesian filtering.

: AQ

: 30305

2019-01-07 08:39