A Diffusion Model for an Urban Area

Turner, D.B.

doi:10.1175/1520-0450(1964)003<0083:admfau>2.0.co;2

Cited by 330 publications

(116 citation statements)

References 4 publications

Supporting

Mentioning

102

Contrasting

Unclassified

Order By: Relevance

“…Different standard deviations equations can be used: Doury's formulas [2], function of travel time, that is the default option, or standard deviations based on Pasquill's theory: Briggs' [3] or Turner's [4]. Following an accidental release in the atmosphere, MITHRA evaluates instantaneous (Bqm −3 ) and time integrated activities concentrations (Bqsm −3 ) for different points and instants defined by the user.…”

Section: Accidental Atmospheric Releasesmentioning

confidence: 99%

Presentation of the CERES platform used to evaluate the consequences of the emissions of pollutants in the environment

2011

View full text Add to dashboard Cite

Abstract. The CERES application (Code d'Evaluations Rapides Environnementales et Sanitaires)has been developed by CEA. It is used to evaluate the consequences on human health of releases of isotopes in the environment, either for emergency planning or for safety evaluation. Various types of emissions can be simulated: atmospheric accidental emission, atmospheric emission during normal operation or emission in liquid media under normal operation. Two versions exist, one devoted to radiological impact, the other one devoted to toxic impact.

show abstract

Section: Accidental Atmospheric Releasesmentioning

confidence: 99%

Presentation of the CERES platform used to evaluate the consequences of the emissions of pollutants in the environment

2011

View full text Add to dashboard Cite

show abstract

“…In general, turbulence measurements are not available and the most widely used method is the atmospheric stability classification proposed by the Pasquill, Gifford and Turner model (PGT model) (Pasquill, 1974;Gifford, 1975), further improved by Turner (1964Turner ( , 1969. In this scheme, six main atmospheric stability classes were defined: A, highly unstable or convective; B, moderately unstable; C, slightly unstable; D, Neutral; E, moderately stable; and F, extremely stable.…”

Section: Gaussian Modelmentioning

confidence: 99%

Spatial dispersion modelling of SO₂ according to the atmospheric circulation in a coastal city: Sfax (Tunisia)

Khlaifi

Dahech

Beltrando

et al. 2008

Meteorological Applications

View full text Add to dashboard Cite

ABSTRACT:It is well-known that weather conditions are a crucial factor influencing pollution dispersion. In very industrialized and crowded coast cities, such as Sfax (on the eastern coast of Tunisia), anticyclonic situations contribute to higher levels of pollution due to atmospheric stability, and, in particular, the occurrence of strong thermal inversion layers. The present work deals with the spatial distribution of the principal pollutant (SO 2 ) emitted by the most polluting factory in Sfax. An easy-to-implement model (based on the Gaussian model of Pasquil) has been developed to calculate spatial distributions of SO 2 in the vicinity of this pollution source. This model has been applied to develop iso-concentration maps for each weather type at different times of the day. Local breeze situations, notably during the transition from diurnal to nocturnal flow, proved to be the most favourable to the formation of strong pollutant concentrations. The simulated SO 2 concentrations were then overlaid on land cover maps, using a GIS, in order to identify the most vulnerable areas.

show abstract

“…An indication of the impact of snow cover on surface daytime dispersion can be qualitatively provided using, for example, Turner's (1964) and PasquillGifford's stability classification. These classifications are based on: (1) the surface wind speed, which is altered somewhat over snow cover; and (2) the solar radiation at the surface (expressed through a radiation index), which actually affects the magnitude of H,.…”

Section: Surface Dispersionmentioning

confidence: 99%

On the impact of snow cover on daytime pollution dispersion

Segal

Garratt

Pielke

et al. 1991

Atmospheric Environment. Part B. Urban Atmosphere

View full text Add to dashboard Cite

Akstract--A preliminary evaluation of the impact of snow cover on daytime pollutant dispersion conditions is made by using conceptual, scaling, and observational analyses. For uniform snow cover and synoptically unperturbed sunny conditions, observations indicate a considerable suppression of the surface sensible heat flux, the turbulence, and the development of the daytime atmospheric boundary layer (ABL) when compared to snow-free conditions. However, under conditions of non-uniform snow cover, as in urban areas, or associated with vegetated areas or bare ground patches, a milder effect on pollutant dispersion conditions would be expected. Observed concentrations of atmospheric particles within the ABL, and surface pollutant concentrations in urban areas, reflect the impact of snow cover on the modification of ABL characteristics.Key word index: Snow cover, boundary layer, turbulence over snow, urban pollution.

show abstract

A Diffusion Model for an Urban Area

Cited by 330 publications

References 4 publications

Presentation of the CERES platform used to evaluate the consequences of the emissions of pollutants in the environment

Presentation of the CERES platform used to evaluate the consequences of the emissions of pollutants in the environment

Spatial dispersion modelling of SO₂ according to the atmospheric circulation in a coastal city: Sfax (Tunisia)

On the impact of snow cover on daytime pollution dispersion

Contact Info

Product

Resources

About

A Diffusion Model for an Urban Area

Cited by 330 publications

References 4 publications

Presentation of the CERES platform used to evaluate the consequences of the emissions of pollutants in the environment

Presentation of the CERES platform used to evaluate the consequences of the emissions of pollutants in the environment

Spatial dispersion modelling of SO2 according to the atmospheric circulation in a coastal city: Sfax (Tunisia)

On the impact of snow cover on daytime pollution dispersion

Contact Info

Product

Resources

About

Spatial dispersion modelling of SO₂ according to the atmospheric circulation in a coastal city: Sfax (Tunisia)