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  1. No Access

    Article

    Some Simple Statistical Models For Relative And Absolute Dispersion

    Observations of the dispersion of a contaminant plume in the atmospheric boundary layer, obtained using a Lidar, are analysed in the coordinate frame relative to the instantaneous centre of mass of the plume, ...

    R. J. Munro, P. C. Chatwin, N. Mole in Boundary-Layer Meteorology (2003)

  2. No Access

    Article

    A Concentration pdf for the Relative Dispersion of a Contaminant Plume in the Atmosphere

    Observations of the dispersion of a contaminant plume in theatmospheric boundary layer, obtained using a Lidar, are analysedin a coordinate frame relative to the instantaneous centre of massof the plume. To im...

    R. J. Munro, P. C. Chatwin, N. Mole in Boundary-Layer Meteorology (2003)

  3. No Access

    Article

    The High Concentration Tails Of The Probability Density Function Of A Dispersing Scalar In The Atmosphere

    The distribution function for concentrations of a scalar pollutant dispersing in the turbulent atmosphere has a finite domain that is bounded above and below. Three methods, based on extreme value statistics, ...

    R. J. Munro, P. C. Chatwin, N. Mole in Boundary-Layer Meteorology (2001)

  4. No Access

    Article

    Dosages from instantaneous releases of dense gases in wind tunnels and into a neutrally stable atmosphere

    We study the doses generated by instantaneously released dense gas clouds. The dose is of practical importance since it is widely used as a measure of the harmful effect of an exposure. We take the doses from ...

    Winston L. Sweatman, P. C. Chatwin in Boundary-Layer Meteorology (1996)

  5. No Access

    Article

    Fluctuations in dense gas concentrations measured in a wind-tunnel

    Concentration time series from FID (flame ionisation detector) sensors and catharometers downstream of an instantaneous release of dense gas contaminants are analysed by statistical methods. For each experimen...

    William B. Zimmerman, P. C. Chatwin in Boundary-Layer Meteorology (1995)

  6. No Access

    Article

    The pitfalls of thresholding atmospheric dispersion data

    Atmospheric dispersion data are invariably corrupted by random noise and perhaps baseline drift giving rise to unreal negative values. This paper shows that the indiscriminate use of thresholding can give rise...

    C. Robinson, D. M. Lewis, P. C. Chatwin in Boundary-Layer Meteorology (1995)

  7. No Access

    Article

    The treatment of atmospheric dispersion data in the presence of noise and baseline drift

    Recently large quantities of data from many different field experiments have become available to facilitate the examination of various proposed models of atmospheric dispersion. However, these data sets are in...

    D. M. Lewis, P. C. Chatwin in Boundary-Layer Meteorology (1995)

  8. No Access

    Article

    The structure and magnitude of concentration fluctuations

    This paper is concerned with the science of turbulent diffusion and not, except incidentally, with its numerous practical applications. It discusses some recent research, particularly that by the authors and t...

    P. C. Chatwin, Paul J. Sullivan in Boundary-Layer Meteorology (1993)

  9. No Access

    Chapter and Conference Paper

    The Incorporation of Wind Shear Effects into Box Models of Heavy Gas Dispersion

    Box models are widely used in predicting the potential hazards associated with the accidental release of heavy gas clouds, and this paper discusses whether, and how, such models should be amended to incorporat...

    P. C. Chatwin in Atmospheric Dispersion of Heavy Gases and Small Particles (1984)