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Diffusion Models of an Impurity Cloud for Real-Time Calculations in Local Radiation Monitoring Systems

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Abstract

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.

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Authors and Affiliations

  1. Scientific and Industrial Association Taifun, Russia

    S. P. Beschastnov

  2. GNIPKII Atoménergoproekt, Russia

    A. V. Naidenov

Authors
  1. S. P. Beschastnov
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  2. A. V. Naidenov
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Beschastnov, S.P., Naidenov, A.V. Diffusion Models of an Impurity Cloud for Real-Time Calculations in Local Radiation Monitoring Systems. Atomic Energy 89, 900–905 (2000). https://doi.org/10.1023/A:1011394316330

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