plume air dispersion model Articles

  • Characterising uncertainty in plume dispersion models

    For management decisions related to effects of releases of toxic chemicals, it is useful to consider not only the expected or most likely impact of the release, but also the envelope of possible outcomes, the latter of which involves an assessment of the uncertainty in the modelling results. In this paper, we provide quantitative estimates of major sources of uncertainty in plume dispersion ...


    By Inderscience Publishers

  • Plume dispersion in the wake of a rectangular model building

    A field experiment was specifically designed and conducted to investigate the width of the near-wake recirculation region of a wide and slender model building. Tracer gas was released from the centre of the leeward side of the building. The results suggested that the width of the wake ranged between 0.6 and 1.1 W in the case of the wind normal to the short side and between 0.5 and 0.9 W in the ...


    By Inderscience Publishers

  • A fluctuating plume model for pollutants dispersion with chemical reactions

    A fluctuating plume model for pollutant dispersion is developed. The model is able to include chemical reactions, accounting for segregation. The model is tested against measured data in wind tunnel experiment, where NO is emitted from a source in an environment of ozone. The results are presented in terms of the plume centre line dispersion and cross sections at different distances. It is shown ...


    By Inderscience Publishers

  • About the plume rise description in the dispersion code SAFE_AIR

    SAFE_AIR is a code simulating the transport and diffusion of airborne pollutants. This code is based on the advection of Gaussian segments and puffs driven by a 3-D wind field produced by a diagnostic model, able to deal with both non-stationary and inhomogeneous conditions. SAFE_AIR is an evolution of the AVACTA II code, "recommended" by the US EPA (United States Environmental ...


    By Inderscience Publishers

  • 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

  • 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

  • Comparison of predictions of the Hybrid Plume Dispersion Model with observations at the Kincaid power plant

    The Hybrid Plume Dispersion Model (HPDM) has been evaluated with observations from a field experiment at the Kincaid power plant. HPDM is a dispersion model for buoyant plumes that employs parameterisations of boundary-layer wind, temperature, and turbulence profiles and Lagrangian time-scales. The model accounts for the bimodal distribution of turbulent velocities in the convective boundary ...


    By Inderscience Publishers

  • Error Propagation in Air Dispersion Modeling

    Air dispersion modeling has been evolving since before the 1930s.  Over the last 15-25 years, strict environmental regulations and the availability of personal computers have fueled an immense growth in the use of mathematical models to predict the dispersion of air pollution plumes.  Beychok's recently published book, 'Fundamentals Of Stack Gas Dispersion', details the evolution of the widely ...


    By Air Dispersion

  • Simulation of plume dispersion using different stack configurations and meteorological inputs

    The application of CALMET/CALPUFF modelling system is well known, and several validation tests were performed until now; however, most of them were based on experiments with a large compilation of surface and aloft meteorological measurements, not always available. Also, the use of an operational large smokestack as tracer source is not so usual. In this work, CALPUFF model is applied to ...


    By Inderscience Publishers

  • The plume model MODIS: integration in the Hydro-Quebec shell

    The comprehensive numerical model MODIS for the simulation of pollutant dispersion from a point source is integrated in the graphical shell of Hydro-Quebec. The shell has been developed by Hydro-Quebec to offer a valuable scheme for various applications of software products, which were originally conceived only for scientific purposes. MODIS, developed by the GKSS Research Centre Geesthacht and ...


    By Inderscience Publishers

  • A puff-particle dispersion model

    A meso-scale puff diffusion model is presented which makes use of the concept of relative diffusion to disperse the puffs and moves their centres of mass by incorporating a Lagrangian stochastic dispersion model as it is normally used to describe particle dispersion. The so-called puff-particle model (PPM) retains the advantages of traditional puff models and at the same time is able to take into ...


    By Inderscience Publishers

  • Using plume rise schemes to model highly buoyant plumes from large fires

    The atmospheric dispersion model Numerical Atmospheric-dispersion Modelling Environment (NAME) is used to simulate the smoke plume from the explosion at the Buncefield oil depot. Simple modelling, in which the plume rise is included through an effective elevated source term, captures the transport and spread of the plume well. More complex modelling, using the NAME plume rise scheme, ...


    By Inderscience Publishers

  • A Lagrangian dispersion model with chemical reactions

    A Lagrangian stochastic (single particle) model is modified in order to account for simple chemistry reactions and tested against measured wind tunnel data. These data refers to a reactive plume generated by a single point source of NO inside a turbulent grid flow doped with ozone. The comparisons were made at different distances from the emission considering all the substances involved in the ...


    By Inderscience Publishers

  • Understanding and Adapting to New Dispersion Models

    The U.S. Environmental Protection Agency (EPA) has proposed revisions to its air dispersion modeling guidance1 (“Guideline on Air Quality Models”, or simply “Guideline”), found in 40 CFR 51 Appendix W.2 These revisions, once finalized, will create significant changes in the way that air quality analyses are performed in the US, and perhaps the most significant changes since the Guideline was ...


    By Trinity Consultants

  • Dispersion modelling of toxic air pollutants from fossil fuel combustion facilities

    The emissions of toxic air pollutants from three power plants and one oil refinery were measured for a period of six months and dispersion of pollutants were calculated by using Air Dispersion Modelling Software (ADMS–4). The plume concentration of carbon monoxide, oxides of nitrogen, sulphur dioxide and particulate matter were calculated over long distances to estimate the incremental ...


    By Inderscience Publishers

  • Canarina DISPER Software · air dispersion · algorithms 1

      Software · air dispersion · algorithms 1   Symbol / Definition A = Linear decay term for ...

  • Canarina DISPER Software · air toxics dispersion model · algorithms 7

      Canarina DISPER Software · air toxics dispersion model   9.1.2 Downwind and Crosswind Distances  The model uses a Cartesian receptor network. All receptor points are converted to Cartesian (X,Y) coordinates ...

  • Canarina DISPER Software · air quality dispersion model · algorithms 3

      Canarina DISPER Software · air quality dispersion model   Symbol / Definition Ly= Initial plume length for Schulman-Scire downwash sources with enhanced lateral plume spread (m) Lb= Lesser of ...

  • A model for the dispersion of puffs into the planetary boundary-layer

    A model for the dispersion of Gaussian puffs into the planetary boundary-layer is presented. The model relies on the relative diffusion theory in which the rate of expansion of the puff is expressed in terms of the spectral properties of turbulence. A new spectral formulation for the turbulent velocities is used, which is valid for different stability conditions ranging from stable to convective. ...


    By Inderscience Publishers

  • Model evaluation of the Austrian Gaussian plume model ON M 9440: comparison with the Kincaid dataset

    The Austrian Gaussian plume model ON M 9440 is evaluated with the Kincaid dataset using the workshop model validation kit. Results are shown for different meteorological options. Mean model concentrations compare well with or overestimate measured data, depending on the choice of these options.Keywords: Gaussian plume model, Kincaid data, model evaluation, plume rise, atmospheric dispersion ...


    By Inderscience Publishers

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