atmospheric dispersion modelling Articles

  • On the dispersion models and atmospheric dispersion

    As an air pollutant is transported, the pollutant disperses into the surrounding air so that it arrives at a lower concentration than it was on leaving the source. Strict environmental regulations worldwide resulted in a growing concern about the validity of air quality dispersion models. The present work is a try to evaluate the applicability of some dispersion models on the emission from an ...


    By Inderscience Publishers

  • Evaluation of statistical models in atmospheric dispersion modelling

    When a gas is released into the atmosphere, there are inevitably random fluctuations in its concentration due to turbulence. Great recent improvements in instrumentation have shown how large these are. This has been acknowledged by CEC (the Commission of the European Communities), for example in that part of its Environment and Climate Programme (Framework IV) dealing with accidents. Likewise, ...


    By Inderscience Publishers

  • A model for simulating atmospheric dispersion in low-wind conditions

    A practical model for low-wind conditions was derived by integration of an instantaneous three-dimensional Gaussian puff equation, in which wind speed was assumed to be zero and standard deviations of a smoke (σy and σz) were expressed as a linear function of the dispersion time. When the plume spreads σy and σz were ...


    By Inderscience Publishers

  • Evaluation of new generation atmospheric dispersion models

    The paper considers the regulatory view of evaluating dispersion models. There is no proscription for regulatory studies in the UK, so differences between dispersion calculations from different models and versions of models are then as important as their absolute veracity. An example shows variations in calculated concentration due to variations between two different versions of a model and two ...


    By Inderscience Publishers

  • Validation of atmospheric dispersion models using ETEX data

    Two models frequently used to simulate the dispersion of pollutants in the atmosphere have been compared. This is necessary because only a well-tested and well-calibrated simulation model can be a good representation of the reality of the dispersion of pollutants. The models evaluated (HYSPLIT_4 with its four variants and MEDIA) were run using as input parameters the same meteorological dataset ...


    By Inderscience Publishers

  • Uncertainty adjustments to deterministic atmospheric dispersion models

    Atmospheric Dispersion Models (ADMs) are routinely used in environmental impact assessment, risk analysis, and source apportionment studies. There are a variety of such computational ADMs, but these models usually only provide deterministic predictions or estimation of uncertainty. By introducing error components in ADMs, we formulate statistical modelling to obtain more precise prediction. These ...


    By Inderscience Publishers

  • Modelling of atmospheric pollutant dispersion in coastal areas

    Some characteristics of air pollution in Tarragona (Spain) were investigated. Tarragona has an important petrochemical industry in a coastal region with a complex terrain. The study was made numerically in sea breeze conditions with a three-dimensional mesoscale meteorological model. The temporal and spatial variations of the wind fields have been used in the Lagrangian equation for a ...


    By Inderscience Publishers

  • Modelling of atmospheric flow and dispersion in the wake of a cylindrical obstacle

    The computational fluid dynamics code ADREA–HF is used to simulate atmospheric dispersion field experiments around an isolated cylindrical obstacle and two upwind sources of ammonia and propane, with the ammonia source located at different lateral positions. Model calculated concentrations and concentration fluctuations are compared with the experimental results, to investigate the effect of the ...


    By Inderscience Publishers

  • Atmospheric dispersion modelling for regulatory purposes in the United Kingdom

    Short-range atmospheric dispersion models are used to assess the environmental impact of airborne pollutants from industrial plants. The results are of interest to a range of specialist and non-specialist groups, including regulators, operators, environmental organisations, and local residents. In order that these groups can be well-informed, it is important to develop clear and consistent ...


    By Inderscience Publishers

  • A review of evaluation procedures for atmospheric dispersion models

    Evaluation of atmospheric dispersion models is vital to justify their use within the air quality component of environmental assessments. The Model Validation Kit, compiled and distributed by Helge Olesen of NERI, is often used for such evaluations. Whilst the Model Validation Kit has a wide range of functionality, its users often limit their evaluation to a few simplistic calculations. ...


    By Inderscience Publishers

  • Simulations of atmospheric dispersion in an urban stable boundary layer

    The results of numerical simulations of tracer dispersion in an urban stable boundary layer are presented. Both Gaussian approximation and fourth order closure are considered and a Gram-Charlier probability density function is used in our Lagrangian stochastic model. Different parameterisations for the boundary-layer height and different values of kurtosis are tested. The model is based on the ...


    By Inderscience Publishers

  • Atmospheric dispersion methods in environmental impact assessment in Flanders

    This paper presents a survey of the experiences in Flanders during the first five years of implementing environmental impact assessment (EIA) as specified by the European Directive 85/337/EEC and the Flemish Orders of 23 March 1989. The current EIA procedure is presented in general, and an indication is given of the number of impact assessments carried out to date. A typical methodology ...


    By Inderscience Publishers

  • Statistical procedure for the inter-comparison of atmospheric dispersion models and model calibration with measurements

    Special analytical methodology for model-model and model-measurement comparison is presented. It can be used with the data provided by airborne transport models. Basic statistical procedures have been elaborated for model calibration and for analysis of the quality and representativeness of the datasets. Special adaptation of well-known methods and elaboration of new ones have been carried out to ...


    By Inderscience Publishers

  • Comparative sensitivity study for operational short range atmospheric dispersion models

    Eight atmospheric dispersion models are compared in a sensitivity study in which the responses towards variations in model input parameters are evaluated. For a single source the values of eight practical model input parameters are varied. The model response is evaluated by examining the maximum value of the 98th percentile of the hourly averaged concentration values. The results are represented ...


    By Inderscience Publishers

  • Regulatory atmospheric short and medium range dispersion models in Italy

    Since the (partial) acceptance in Italy of the EU Directive 85/337/EEC concerning environmental impact assessment procedures, there has been a rapid growth in the use of atmospheric dispersion simulation tools, which are also being used in air-quality management plans. This paper describes the state of the art in the development and application in Italy of the short and medium range ...


    By Inderscience Publishers

  • Comparison between analytical models to simulate pollutant dispersion in the atmosphere

    We present a numerical and statistical comparison between ADMM and GILTT approaches to simulate pollutant dispersion in the Planetary Boundary Layer (PBL). The numerical and statistical comparison of the ADMM and GILTT results confirms the equivalence of these methods. However, the ADMM approach is more efficient under computational point of view regarding the issue of computational time and, ...


    By Inderscience Publishers

  • Model comparison in simulating the atmospheric dispersion of a pollutant plume in low wind conditions

    This study investigates the performance of different air pollution dispersion models in low wind conditions. The models have been applied to two sites frequently characterised by weak winds: the cities of Modena and Reggio Emilia, in the Po River Valley (Northern Italy). The emission sources are the municipal waste incinerator (Modena) and a turbogas plant (Reggio Emilia). Total Suspended ...


    By Inderscience Publishers

  • Canarina DISPER software · atmospheric dispersion modeling · commands 9

    XZ-Plane (perpendicular to land surface):   In such a case, the program window is a XZ-plane (perpendicular to the land surface). A pollutant point source (stack) is represented by a small square. In the Status bar at the bottom, we have X,Y and Z coordinate values in meters and data on our environmental system. Point the mouse where ...

  • Statistical evaluation of centreline concentration estimates by atmospheric dispersion models

    Within the American Society for Testing and Materials (ASTM), a standard practice (Z6849Z1) is being developed to provide an objective statistical procedure for comparing air quality simulation modelling results with tracer field data. The practice is limited to steady state, local-scale transport from isolated point sources in simple terrain. Evaluation data having similar external conditions ...


    By Inderscience Publishers

  • Recent studies to validate and compare atmospheric dispersion models for regulatory purposes in the UK

    Some results are presented for recent studies to develop new approaches for (i) validating atmospheric dispersion models using crosswind concentration transects, and (ii) summarising and comparing the predictions of models across a range of efflux and meteorological conditions.Keywords: crosswind concentration, dispersion climate, dispersion modelling, ...


    By Inderscience Publishers

Need help finding the right suppliers? Try XPRT Sourcing. Let the XPRTs do the work for you