In-town dispersion calculations with RIMPUFF and UDM

P. Astrup, Søren Thykier-Nielsen, Torben Mikkelsen

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    Abstract

    Input to ERMIN, deposition of radioactive matter inside inhabited areas from releases both within and outside such areas, shall in a decision support system be produced by dispersion codes, followed by data-assimilation. The present work focuses on thedifferences in near surface concentrations and in depositions obtained with a code designed for dispersion of a release from a nuclear power plant, typically situated at a distance from densely inhabited areas, and a code specifically designed forpredicting dispersion from sources inside urban areas. The codes applied are the RIMPUFF code, RIsø Mesoscale PUFF model from Risø National Laboratory, Denmark, and the UDM code, Urban Dispersion Model, from “dstl”, Defence Science and TechnologyLaboratory, Porton Down, United Kingdom. For an above-town release only small differences are seen between the codes, but for a in-town ground release, e.g. a dirty bomb, the UDM code predicts much larger concentrations in an area close to the releasepoint and, if wind shifts occur, gives a rather different plume all over.
    Original languageEnglish
    Number of pages18
    ISBN (Print)87-550-3485-3
    Publication statusPublished - 2005
    SeriesDenmark. Forskningscenter Risoe. Risoe-R
    Number1539(EN)
    ISSN0106-2840

    Keywords

    • Risø-R-1539
    • Risø-R-1539(EN)

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