NRPB-R157

Author(s):

Jones, J A

Summary:

Models to allow for the effects of coastal sites, plume rise and buildings on dispersion of radionuclides and guidance on the value of deposition velocity and washout coefficients.

The abstract of the document is given below followed by an errata.

Price:

£5.00
ISBN 0-85951-216-9

Available from NRPB archive.

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The full document
(PDF, 2.7 MB, 63 pages)

Abstract

This report is the fifth in a series giving practical guidance to estimate the dispersion of radionuclides released to the atmosphere. It represents the conclusions of a Working Group established to review recent developments in atmospheric dispersion modelling and to propose models for use within the UK. This report describes methods proposed by the Group to extend the models given in its earlier reports to cover dispersion at coastal sites, the effects of plume buoyancy and initial momentum, and the effects of buildings on dispersion. It also includes guidance on the values of deposition velocity and washout coefficient for use in the models recommended in the Group’s second report.

Errata

The following changes have been made to this report since its first publication (December 1983).

August 2003

Page vi Definition of momentum flux Fm corrected

Page 18 Definition of momentum flux Fm corrected
Units of effluent density ?o corrected
Units of specific heat of air cp corrected

Page 20 Definition of the heat emission rate QH corrected
Definition of the momentum emission rate QM corrected

Page 31 Equation C12 corrected