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Dispersion Modeling Environmental Articles & Analysis
81 articles found
BREEZE is the market-leading air dispersion modeling software used by environmental professionals around the world Receptors are specific locations, set up in air quality dispersion models, where ambient concentration estimates or deposition values are needed. ...
While most air dispersion modeling is conducted using meteorological data from recent past years and historical or projected emissions data, models can also be used with real-time or short-term forecast meteorological and emissions data to estimate impacts at the present time and in the near future. In order to develop these custom real-time air dispersion modeling and forecasting systems, ...
To validate this method, artificial receptor data at two receptor sites are derived from numerical simulations with a given aerial source, using the Lagrangian dispersion model (LSM) FLEXPART in forward mode. Then the RTs are computed using again the model FLEXPART, but in backward mode. ...
We developed a fluctuating plume model able to evaluate all the higher order moments of concentration only requiring the knowledge of the first one. The simple algorithm used to calculate the meander centroid component is independent of the method used to obtain the mean concentration field and makes the computational time lower than most meandering plume model ...
This paper reviews recent findings in the field of flow and pollutant dispersion modelling around buildings and within complex urban geometries. ...
A stationary three–dimensional Lagrangian stochastic numerical model, LAGrangian FLUctuation Model (LAGFLUM), was developed by coupling a macromixing with a micromixing scheme, to determine the mean and the variance of concentration for a passive scalar in 3D turbulent flows. The model was tested by comparison with the (MUST) Mock Urban Setting ...
WRF–ARW/HERMES/CMAQ modelling system is applied with high resolution (1 km², 1 h) to assess changes in Madrid and Barcelona (Spain) air quality due to hybrid cars introduction. ...
This paper presents the SARRIM Software, a multi-function atmospheric dispersion model dealing with the local and large scale impact assessment for propellant and hypergolic rocket releases, nominal or accidental launch, controlled propellant fires and booster test bench. ...
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. ...
This is one of the reasons why there are no formalised procedures for using dispersion models in the environmental assessment process. In the absence of-centralised guidance, practitioners of environmental assessment have largely turned to the models made available by the United States ...
This paper discusses the main principles of atmospheric diffusion modelling for regulatory purposes in Russia. They include the choice of air quality criteria, the development of universal models to calculate on a single base the dispersion of atmospheric pollutants from different types of source under unfavourable meteorological and ...
The most widely accepted model of atmospheric dispersion for impact assessment in France is the Gaussian model of Doury. ...
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 ...
The capabilities of the Lagrangian particle model LAMBDA in simulating tracer dispersion are shown. Two different datasets of experimental campaigns proposed in the Manno Workshop (Copenhagen and Lillestrom) are used to compare measured and calculated concentrations. ...
The tool for dispersion calculations in The Netherlands originated from a consensus process among experts from licensing authorities, industry and science. This paper describes its characteristics and applications in the light of its history and future.Keywords: air pollution, consensus, atmospheric dispersion model, frequency distribution, ...
Operational models that use solutions of the advection-diffusion equation based on more realistic assumptions than that of homogeneous wind and eddy diffusivity coefficients are presented. ...
These projects result in predictive models and experimental data. To make these models and data available for a wider community and to judge their areas of application, the REDIPHEM project (REview and DIssemination of PHysical Effect Models) was started. This project covers two topics: heavy gas dispersion and source terms. This ...
The source module takes into account instantaneous and continuous releases and the short distance dispersion of dense or neutral gases. The two modules integrating the topography are the meso-meteorological module and the dispersion module. ...
For this purpose, an 'on-line' practical model must be used with a limited number of input meteorological data. ...
At present, modelling of lead, zinc, arsenic, cadmium and mercury concentrations is carried out within the EMEP grid. At the same time, MSC East performs model calculations within the whole northern hemisphere to the north of 20°N. ...