Experimental and Theoretical Investigations into Chimney Emissions First Paper: A Simple Boundary-Layer Model for Predicting Time Mean Ground-Level Concentrations of Material Emitted from Tall Chimneys

The simple ‘conical’ model of plume dispersion from an elevated source of effective height H (m) which indicates that the maximum ground-level concentration Cm (units m-3) is proportional to Q (rate of emission, units s-1) (σZ/ay)/U (wind speed, ms-1) X H2 assumes that the vertical (σz) and cross-wind (σy) spreads of plume material are similar functions of distance downwindFor time average values of Cm of duration about 1 h, the length scale of the turbulence responsible for the cross-wind spread is, in general, much greater than that responsible for the vertical spread. This length ***l is restricted either by the depth h of the boundary layer or the height above the ground. In this case (σz/σy) in the expression for Cm must be replaced by (Some representative vertical turbulent velocity *l)/(Some representative cross-wind turbulent velocity X H)’***In conditions of strong thermal convection and light winds the turbulent vertical velocities are effectively independent of the wind speed and so the form of...

[1]  D. J. Moore.  A comparison of the trajectories of rising buoyant plumes with theoretical/empirical models , 1974 .

[2]  P. M. Hamilton,et al.  A Discussion on recent research in air pollution - The application of a pulsed-light rangefinder (lidar) to the study of chimney plumes , 1969, Philosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences.

[3]  C. Readings,et al.  Fine-scale structure and mixing within an inversion , 1973 .

[4]  J. Counihan.  Adiabatic atmospheric boundary layers: A review and analysis of data from the period 1880–1972 , 1975 .

[5]  R. A. Scriven.  A Discussion on recent research in air pollution - Variability and upper bounds for maximum ground level concentrations , 1969, Philosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences.

[6]  K. W. James,et al.  Paper I: the measurement of plume rise and dispersion at tilbury power station , 1967 .

[7]  J. Weil,et al.  A correlation of ground-level concentrations of sulfur dioxide downwind of the Keystone stacks. , 1973, Atmospheric environment.

[8]  A. Townsend.  Wind and the formation of inversions , 1967 .

[9]  G. A. Briggs,et al.  PLUME RISE: A CRITICAL SURVEY. , 1969 .

[10]  O. Sutton,et al.  The theoretical distribution of airborne pollution from factory chimneys , 1947 .

[11]  D. H. Lucas.  Paper VI: Application and evaluation of results of the tilbury plume rise and dispersion experiment , 1967 .

[12]  D. J. Moore.  The prediction of the mean hourly average maximum ground level concentration of sulphur dioxide at Tilbury. , 1974, Atmospheric environment.