Modeling the Dispersion of Vapor and Aerosol Particulates in the Atmospheric Boundary Layer PDF Download
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Languages : en
Pages : 0
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The goal of this project is to improve our scientific understanding of dispersion issues over complex terrain and publish results in scientific journals. Three scientific articles and one student's Master thesis are under preparation based on the results supported by this project. The first paper, entitled "The role of advection of fluxes on modeling dispersion in convective boundary layers", is aimed at examining the importance of the advection terms for dispersion in a convective boundary layer. An Eulerian three-dimensional higher-order closure dispersion model is presented. The model uses mean wind and turbulence values from a second order atmospheric boundary layer model. The dispersion model is validated against results from tank and field experiments and compared to results from Lagrangian dispersion models. The results show good agreement with experiment and Lagrangian modeling results for point source dispersion in a convective boundary layer. Sensitivity studies of the model helped to identify the roles that advection and horizontal transport terms in the equations for the fluxes play in simulating the essential features of pollutant dispersion. The results from the sensitivity tests show that the famous features of dispersion from a point source in the convective boundary layer - with an ascending plume during ground level release and descending for a lifted point source - is caused by the advection term in the equation for the vertical flux. Furthermore, it is shown that there is a tendency for the plume to split horizontally, which is also caused by the advection term in horizontal fluxes.
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Category :
Languages : en
Pages : 0
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Book Description
The goal of this project is to improve our scientific understanding of dispersion issues over complex terrain and publish results in scientific journals. Three scientific articles and one student's Master thesis are under preparation based on the results supported by this project. The first paper, entitled "The role of advection of fluxes on modeling dispersion in convective boundary layers", is aimed at examining the importance of the advection terms for dispersion in a convective boundary layer. An Eulerian three-dimensional higher-order closure dispersion model is presented. The model uses mean wind and turbulence values from a second order atmospheric boundary layer model. The dispersion model is validated against results from tank and field experiments and compared to results from Lagrangian dispersion models. The results show good agreement with experiment and Lagrangian modeling results for point source dispersion in a convective boundary layer. Sensitivity studies of the model helped to identify the roles that advection and horizontal transport terms in the equations for the fluxes play in simulating the essential features of pollutant dispersion. The results from the sensitivity tests show that the famous features of dispersion from a point source in the convective boundary layer - with an ascending plume during ground level release and descending for a lifted point source - is caused by the advection term in the equation for the vertical flux. Furthermore, it is shown that there is a tendency for the plume to split horizontally, which is also caused by the advection term in horizontal fluxes.
Author: Karl B. Schnelle
Publisher: McGraw-Hill Professional Publishing
ISBN:
Category : Nature
Languages : en
Pages : 570
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Book Description
CD-ROM includes: Practice problems that reinforces and deepen understanding of modeling principles.
Author: Eric P. Shettle
Publisher:
ISBN:
Category : Aerosols
Languages : en
Pages : 100
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Book Description
Author: Joe J. Mathis
Publisher:
ISBN:
Category : Air
Languages : en
Pages : 56
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Author: Rod Barratt
Publisher: Routledge
ISBN:
Category : Nature
Languages : en
Pages : 170
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Book Description
First Published in 2001. Routledge is an imprint of Taylor & Francis, an informa company.
Author: Raymond Viskanta
Publisher:
ISBN:
Category : Air
Languages : en
Pages : 128
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Author: Steven R. Hanna
Publisher: John Wiley & Sons
ISBN: 047093560X
Category : Technology & Engineering
Languages : en
Pages : 228
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Book Description
A key component of risk reduction is reducing the potential consequences that could result from toxic or flammable releases. The science of vapor cloud dispersion has advanced significantly in recent years, but one of the long-standing challenges has been in accounting for dispersion around buildings, equipment, and similarly sized geologic and man-made features. With current concerns about terrorism in industrial and urban sites, improving consequence modeling within industrial and urban sites is more important than ever This new definitive book advances the science of vapor cloud dispersion by: ·Describing how structures at an urban or industrial site affect dispersion, and how these effects should be treated in consequence models ·Explaining surface roughness length (z0) and displacement length (d) so that they are clarified for readers with minimal meteorological background ·Presenting criteria for when the structures should be considered broadly as roughness elements, or when they should be considered from the viewpoint of their wake effects ·Defining conditions for which different models apply and providing continuous solutions for transitions between flow regimes. ·Providing the appropriate roughness inputs to transport and dispersion models depending on conditions. ·Demonstrating the application of these techniques through worked examples.
Author:
Publisher:
ISBN:
Category : Atmospheric diffusion
Languages : en
Pages : 410
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Author: F.T. Nieuwstadt
Publisher: Springer Science & Business Media
ISBN: 9401091129
Category : Science
Languages : en
Pages : 375
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Book Description
The study of turbulence in the atmosphere has seen considerable progress in the last decade. To put it briefly: boundary-layer meteorology, the branch of atmospheric science that concentrates on turbulence in the lower atmosphere, has moved from the surface layer into the boundary layer itself. The progress has been made on all fronts: theoretical, numerical and observational. On the other hand, air pollution modeling has not seen such a rapid evolution. It has not benefited as much as it should have from the increasing knowledge in the field of atmospheric turbulence. Air pollution modeling is still in many ways based on observations and theories of the surface layer only. This book aims to bring the reader up to date on recent advances in boundary-layer meteorology and to pave the path for applications in air pollution dispersion problems. The text originates from the material presented during a short course on Atmospheric Turbulence and Air Pollution Modeling held in The Hague during September 1981. This course was sponsored and organized by the Royal Netherlands Meteorological Institute, xi xii PREFACE to which both editors are affiliated. The Netherlands Government Ministry of Health and Environmental Protection and the Council of Europe also gave support.
Author: Steven R. Hanna
Publisher: American Institute of Chemical Engineers
ISBN:
Category : Science
Languages : en
Pages : 200
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Book Description
