caa a22 4500 475828577 CHVBK 20180406123835.0 cr unu---uuuuu 170329e20001101xx s 000 0 eng 10.1023/A:1011394316330 doi (NATIONALLICENCE)springer-10.1023/A:1011394316330 Diffusion Models of an Impurity Cloud for Real-Time Calculations in Local Radiation Monitoring Systems [Elektronische Daten] [S. Beschastnov, A. Naidenov] The two real-time numerical models of the spreading of a cloud of gas-aerosol impurity in the atmosphere are presented: a Lagrangian model and a model based on the method of moments of the concentration fields. It was shown that in most empirical relations for the relative variances of the impurity concentration fields in a cloud the contribution of wind shears is strongly overestimated and that the coefficient of proportionality in each term of the formulas for the transverse variance is approximately d v = 0.036, but not 1/6, as in the early works. The models were used to estimate the proportionality coefficient d v ∼ 0.05-0.1 in the formulas for the longitudinal relative variance. The numerical experiments also showed that the natural variability of wind fields strongly affects the position of spots on the ground and the contamination levels produced as result of instantaneous impurity emissions from high sources. 1 figure, 1 table, 18 references. Plenum Publishing Corporation, 2000 Beschastnov S. Scientific and Industrial Association Taifun, Russia aut Naidenov A. GNIPKII Atoménergoproekt, Russia aut Atomic Energy Kluwer Academic Publishers-Plenum Publishers 89/5(2000-11-01), 900-905 1063-4258 89:5<900 2000 89 10512 https://doi.org/10.1023/A:1011394316330 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1023/A:1011394316330 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Beschastnov S. Scientific and Industrial Association Taifun, Russia aut NATIONALLICENCE 700 1- Naidenov A. GNIPKII Atoménergoproekt, Russia aut NATIONALLICENCE 773 0- Atomic Energy Kluwer Academic Publishers-Plenum Publishers 89/5(2000-11-01), 900-905 1063-4258 89:5<900 2000 89 10512 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer