0537537 20240103225130.420210114235959.9 85098651712 000613546900001 10.1016/j.atmosenv.2020.118105 15 s. P cav_un_epca*02562131352-2310246Elsevier Low wind speed Atmospheric dispersion Radioactivity dissemination Hot spot occurrence Inverse modelling cav_un_auth*0101176 Pecha Petr UTIA-B Adaptivní systémy Department of Adaptive Systems AS AS Department of Adaptive Systems Ústav teorie informace a automatizace AV ČR, v. v. i. cav_un_auth*0267768 Tichý Ondřej UTIA-B Adaptivní systémy Department of Adaptive Systems AS AS Department of Adaptive Systems Ústav teorie informace a automatizace AV ČR, v. v. i. cav_un_auth*0021085 Pechová E. CZ http://library.utia.cas.cz/separaty/2021/AS/pecha-0537537.pdf https://www.sciencedirect.com/science/article/pii/S1352231020308372 GA20-27939S cav_un_auth*0391986 GA ČR 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. 2022 AQ WOS 30000 30300 30305 3 RVO:67985556 http://hdl.handle.net/11104/0315349 1 S 118105 3+4 Article Environmental Sciences|Meteorology Atmospheric Sciences C ENVIRONMENTALSCIENCES|METEOROLOGY&ATMOSPHERICSCIENCES 6.027 1.76 9.9 0.03373 1.045 77550 292 1.383 60.12 5.77 11887 Q1 5.241 683 Q1 76.6 Q2 Q1 1.08 Q1 80.319 2021 85098651712 SCOPUS PUBMED 000613546900001 WOS cav_un_epca*0256213 Atmospheric Environment 1352-2310 1873-2844 Roč. 246 č. 1 2021 Elsevier