Comparison Among Empirical Probability Density Functions of the Vertical Velocity in the Surface Layer Based on Higher Order Correlations

Anfossi, D.; Ferrero, E.; Sacchetti, D.; Castelli, Silvia

doi:10.1023/a:1000206913196

Cited by 39 publications

(22 citation statements)

References 24 publications

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“…In the vertical direction, the PDF is assumed to be non-Gaussian to describe non-uniform turbulent conditions. In this case, the Gram-Charlier series expansion is adopted (Anfossi et al 1997;Ferrero and Anfossi 1998). The diffusion coefficient b ij (x, u) is obtained from the Lagrangian structure function and is related to the Kolmogorov's universal constant, C 0 (Du 1997), and to the dissipation rate of turbulent kinetic energy e, as the following equation:…”

Section: Modelling Of the Plume Dispersion In Atmospherementioning

confidence: 99%

Tri-generation power plant and conventional boilers: pollutant flow rate and atmospheric impact of stack emissions

Ghermandi

Teggi

Fabbi

et al. 2014

Int. J. Environ. Sci. Technol.

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The atmospheric impact of stack emissions from a power plant (tri-generator and boilers) that will be installed in an urban area in the central Po valley (Northern Italy), characterized by calm wind events, is studied and compared with the impact of the existing plant (conventional boilers). Both the plants are supplied by methane gas. The atmospheric dispersion of NO x emitted is simulated, both in the current and future scenario, by the software package ARIA INDUSTRY. The NO x emission rates are set equal to the regulatory emission limits for existing and future boilers, while the tri-generation system emission rates are set equal to the emission limits certified by the system manufacturer. The simulation periods focus over the 2010 winter season. The simulation estimates the impact of NO x emissions on air quality (vertical concentration profiles and concentration maps at the ground) in the urban area close to the plant. The future power plant impact on air quality results lower than the impact of the existing plant, even if the yearly total mass of pollutants emitted in atmosphere from the new power plant is higher than from the existing plant. The emissions of conventional boilers result the main responsible of the air pollution at the ground in the future scenario.

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Section: Modelling Of the Plume Dispersion In Atmospherementioning

confidence: 99%

Tri-generation power plant and conventional boilers: pollutant flow rate and atmospheric impact of stack emissions

Ghermandi

Teggi

Fabbi

et al. 2014

Int. J. Environ. Sci. Technol.

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“…The Lagrangian particle model LAMBDA was developed to study the transport process and pollutants diffusion, starting from the Brownian random walk modeling (Anfossi & Ferrero, 1997). In the LAMBDA code, full-uncoupled particle movements are assumed.…”

Section: The Lagrangian Stochastic Model Lambdamentioning

confidence: 99%

“…Of course, for backward integration, the time considered is '  tt , and velocity '  UU , being U the mean wind speed. The horizontal PDFs are considered Gaussians, and for the vertical coordinate the truncated Gram-Charlier type-C of third order is employed (Anfossi & Ferrero, 1997). The diffusion coefficients, ( , , ) ij bt xu , for both forward and backward integration is given by…”

Section: The Lagrangian Stochastic Model Lambdamentioning

confidence: 99%

Strategies for Estimation of Gas Mass Flux Rate Between Surface and the Atmosphere

Velho¹,

Roberti²,

Paes³

2012

Air Pollution - Monitoring, Modelling and Health

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“…a depends on the Eulerian PDF of the turbulent velocity and is determined from the Fokker-Planck equation under steady conditions for the statistical momentum (Thomson, 1987;Rodean, 1996). A Gram-Charlier PDF, which is given by the series of Hermite polynomials, can be adopted (Anfossi et al, 1997;Ferrero and Anfossi, 1998). The Gram-Charlier PDF truncated to the fourth order is given by the following expression (Kendall and Stuart, 1977): …”

Section: Lagrangian Modelmentioning

confidence: 99%

“…The second technique is based on solution of the Langevin equation through the Method of Successive Approximations or Picard's Iteration Method (Carvalho et al, 2004. Lagrangian particle models are obtained considering the Gram-Charlier Probability Density Function (PDF) of turbulent velocity, through which Gaussian and non-Gaussian turbulence conditions can be considered (Anfossi et al, 1997;Ferrero and Anfossi, 1998). The main objective of this paper is to present and discuss the results of a model evaluation between two semi-analytical techniques, focusing the quality and accuracy of these techniques in pollutant emitted from low and high sources.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of two semi-analytical techniques in air quality applications

Carvalho

Moreira

2007

Rev. bras. meteorol.

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RESUMO: AVALIAÇÃO DE DUAS TÉCNICAS SEMI-ANALÍTICAS EM APLICAÇÕES NA QUALIDADE DO AR.Neste artigo é realizada uma avaliação de duas técnicas semi-analíticas, considerando a qualidade e a exatidão destas técnicas em reproduzir valores de concentração ao nível da superfície de poluentes passivos emitidos a partir de fontes baixas e altas. A primeira técnica é um modelo Euleriano baseado na solução da equação advecção-difusão através da técnica de transformada de Laplace. A segunda é um modelo Lagrangiano baseado na solução da equação de Langevin através do Método Iterativo de Picard. Parâmetros da turbulência são calculados de acordo com uma parametrização capaz de gerar valores contínuos em todas as condições de estabilidade e em todas as alturas na camada limite planetária. Simulações numéricas e comparações mostram uma boa concordância entre valores de concentração previstos e observados. Comparações entre as duas técnicas revelam que o modelo Lagrangiano gera resultados mais precisos, mas o modelo Euleriano exige um menor tempo computacional. Palavras-chave: técnica semi-analítica, modelo Euleriano, modelo Lagrangiano, transformada de Laplace, Método Iterativo de Picard, avaliação de modelos.

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Comparison Among Empirical Probability Density Functions of the Vertical Velocity in the Surface Layer Based on Higher Order Correlations

Cited by 39 publications

References 24 publications

Tri-generation power plant and conventional boilers: pollutant flow rate and atmospheric impact of stack emissions

Tri-generation power plant and conventional boilers: pollutant flow rate and atmospheric impact of stack emissions

Strategies for Estimation of Gas Mass Flux Rate Between Surface and the Atmosphere

Evaluation of two semi-analytical techniques in air quality applications

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