Simulation of accidental release using a coupled transport (TREX) and numerical weather prediction (ALADIN) model

Róbert Mészáros, Csilla Vincze, I. Lagzi

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

A dispersion model-system called TREX (TRansport-EXchange) was developed at the Eötvös Loránd University (Budapest, Hungary) for modeling the transport and deposition processes of air pollutants originated from either continuous or accidental releases. In this study, a multi-layered, Eulerian version of the TREX model is presented that can simulate transport, transformation, and deposition processes of radionuclides or chemically toxic substances over Central Europe. The TREX model was coupled to the ALADIN mesoscale limited area numerical weather prediction model used by the Hungarian Meteorological Service to predict the path of nuclear contamination in the atmosphere. Two case studies - hypothetical accidents at the Paks Nuclear Power Plant (Paks NPP) - are presented to show how the coupled model can capture the dispersion of radionuclides from a single point source. Another effort of this study is to present a new method, a simple spatial semi-adaptive grid algorithm, which could be an effective tool for accelerating simulations. In this method, model calculations are performed only in the grid cells where concentrations in the previous time step are higher than a user defined threshold concentration. Reduction of the computational time depends on this threshold value, but decreases of more than 60% are found without decreasing the accuracy of the results. The efficiency of this method and a comparative analysis of model estimations with and without this method are also presented in this study.

Original languageEnglish
Pages (from-to)101-120
Number of pages20
JournalIdojaras
Volume114
Issue number1-2
Publication statusPublished - 2010

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weather
prediction
simulation
radionuclide
toxic substance
nuclear power plant
point source
accident
method
atmosphere
modeling

Keywords

  • Accidental release
  • Dispersion model
  • Numerical weather prediction model
  • Semi-adaptive grid

ASJC Scopus subject areas

  • Atmospheric Science

Cite this

Simulation of accidental release using a coupled transport (TREX) and numerical weather prediction (ALADIN) model. / Mészáros, Róbert; Vincze, Csilla; Lagzi, I.

In: Idojaras, Vol. 114, No. 1-2, 2010, p. 101-120.

Research output: Contribution to journalArticle

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