dispersion modeling Articles
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Dispersion from elevated sources above obstacle arrays: modelling requirements
A series of wind-tunnel experiments is used to investigate the requirements of "practical" models for the prediction of the behaviour of stack emissions from an industrial site (i.e. a group of buildings), in particular for the determination of ground-level concentration or exposure downwind from the site. The study addresses Gaussian plume modelling and, assuming that an adequate model ...
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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 ...
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Comparison between field measurements of 85Kr around the BNFL Sellafield reprocessing plant and the predictions of the NRPB R-91 and UK-ADMS atmospheric dispersion models
Air concentrations of the radioisotope krypton-85 (85Kr), released from the BNFL Sellafield reprocessing site, were compared with the predictions of two atmospheric dispersion models NRPB R-91 and the next generation UK-ADMS model (version 3). Data on stack emissions and local meteorology were used as model input, whilst building effects were included using a simple "effective stack ...
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Pilot study: extension of the Model Validation Kit
The so-called Model Validation Kit has been used as a basis for modelling exercises at workshops in Manno (1993), Mol (1994) and at the present workshop. It is a practical tool, meant to serve as a common frame of reference for modellers. It consists of three experimental datasets, accompanied by software for model evaluation. Before the present workshop, a pilot study was conducted, aimed at ...
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Evaluation of the ADMS, AERMOD, and ISC3 dispersion models with the OPTEX, Duke Forest, Kincaid, Indianapolis and Lovett field datasets
The model evaluation exercise addresses the question of whether the new models, ADMS and AERMOD, produce improvements over ISC3 when compared with a range of field observations. ADMS and AERMOD have similar state-of-the-art scientific components, whereas ISC3 contains 1960s technology. The five sets of field observations used in the statistical evaluation represent a cross-section of typical ...
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Air Dispersion Models - Models can be used to aid in demonstrating environmental compliance, analyzing process changes and evaluating the impacts of accidental releases
Air dispersion models are used to estimate the downwind concentration of pollutants emitted by various pollution sources such as industrial facilities and regional public traffic. Dispersion models play an important role in the industrial and regulatory communities. They are typically used to demonstrate compliance with National Ambient Air Quality Standards as part of new source review, ...
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Comparison of six Gaussian dispersion models used for regulatory purposes in different countries of the EU
The environmental impact of industrial emissions from stacks of 30m, 80m and 150m have been compared using five Gaussian models that are routinely used for regulatory purposes in one or more member states of the EU. The models are: IFDM (Belgium), PLUIMPLUS (the Netherlands), AUSTAL86 (Germany), OML (Denmark) and ISCST2 (several countries). All models are run with the same meteorological input ...
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Dispersion modeling— New downwash calculations change the playing field
For many people, the terms “stack height” and “dispersion model” do not ring a bell. Others grapple with these terms as they can be challenging factors in the process of obtaining an air construction permit. Have you ever constructed a stack at a specific height due to EPA guidelines and regulations surrounding Good Engineering Practice (GEP) as it relates to air ...
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Implication of Applying CALPUFF to Demonstrate Compliance with the Regional Haze Rule
Abstract The U.S. Environmental Protection Agency promulgated the final Regional Haze Rule in July 1999 to protect Class I areas from visibility impairment. Industrial sources may be required to conduct modeling analysis to demonstrate their potential impact on nearby Class I areas during air permit applications. Although the widely used Industrial Source Complex Short-Term model (ISCST3) can be ...
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