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Abstract

Atmospheric transport and dispersion models at short distances have improved substantially in recent years, allowing a detailed calculation of the concentration and deposition fields, subsequent to an accidental or continuous emission, even in a complex thermal or orographic situation. The Lagrangian particle-in-cell models, for example, use a three-dimensional wind field that is derived from wind and turbulence measurements, with a mass-consistent approach. The most elementary Gaussian puff/plume models have been modified for use in unsteady and heterogeneous wind fields and they require such three-dimensional wind profiles as input data. This paper compares Gaussian and more complex Lagrangian models, starting from a simple set of micrometeorological measurements in three typical meteorological situations (unstable, neutral and stable condition). An analysis of the relative performance of the two models is also given, based on the orographic information.

Additional information

Authors: GRAZIANI G, JRC Ispra (IT);MAINERI M, JRC Ispra (IT);VERNETTI C, JRC Ispra (IT)
Bibliographic Reference: Paper presented: Special Meeting on Advanced Modelling and Computer Codes for Calculating Local Scale and Meso-Scale Atmospheric Dispersion of Radionuclides, Gif-sur-Yvette (FR), March 6-8, 1991
Availability: Available from (1) as Paper EN 36573 ORA
Record Number: 199210227 / Last updated on: 1994-12-02
Category: PUBLICATION
Original language: en
Available languages: en