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Table of Contents

Chapter 1:   Atmospheric Parameters


The Atmosphere And Lapse Rates
Units Used In This Book
Pasquill Stability Classes
Potential Temperature Gradients
Inversion Layers And Mixing Heights


Chapter 2:   Gaussian Dispersion Equations


Statistical Distributions
The Gaussian Distribution
Continuous Point-Source Plumes
Vertical Concentration Profiles
Crosswind Concentration Profiles
Discussion Of Input Parameters
Typical Plume Behavior Modes
Boundary -To-Centerline Concentration Ratios


Chapter 3:   Dispersion Coefficients


The Historical Development Of Dispersion Coefficients
The Pasquill Dispersion Coefficients
Dispersion Coefficients In Equation Form
Rural Versus Urban Dispersion Coefficients


Chapter 4:   Plume Rise


Introduction
Plume Rise Variables
Trajectory Of A Bent-Over Buoyant Plume
The Buoyancy Flux Parameter
The Stability Parameter
The Momentum Flux Parameter
Briggs' Equations For Bent-Over Buoyant Plumes
Calculated Plume Trajectories
Other Briggs Equations
Logic Diagram For Using Briggs' Equations To Obtain The Rise Of           Bent-over Buoyant Plumes


Chapter 5:   Time-Averaging Of Concentrations


The Components Of Turbulence
Extrapolating Time-Averaged Concentration


Chapter 6:   Wind Velocity Profiles


The Need For Wind Velocity Profiles
Wind Velocity Versus Altitude


Chapter 7:   Calculating Stack Gas Plume Dispersion


Introduction
Calculation Examples
Example Graphs of Ground-Level Concentrations
      Versus Downwind Receptor Distances
Plotting Isopleths
The Accuracy Of Dispersion Models


Chapter 8:   Trapped Plumes


Introduction
Multiple Reflections
Where Vertical Dispersion Of Trapped Plumes
      Becomes Uniform
Turner's Approximation
Ground-Level Concentrations From Trapped Plumes


Chapter 9:   Fumigation


Evolution Of A Plume Fumigation
Ground-Level Concentrations During Fumigation
Crosswind Dispersion During Fumigation
Downwind Distance To Maximum Fumigation
Calculation Example
Time-Averaging Of A Fumigation
Other Methods
Closing Comment On Predicting Stack Gas Dispersion


Chapter 10:   Meteorological Data


Wind Roses
Distribution Of Calms
The STAR Data


Chapter 11:   Flare Stack Plume Rise


Introduction
Flame Length
Combusted Gas Temperature
Calculation Of Flare Stack Plume Rise


Chapter 12:   Miscellany


Short-Term Releases
Source And Receptor At Different Ground-Level Elevations
More Rigorous Definition Of Briggs' Buoyancy Parameter
Converting Plume Concentration Expressions
Effect Of Altitude On Ambient Air Standards
Categorizing Atmospheric Stability With The
      Richardson Number
More On Dispersion Coefficients In Equation Form


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Or click on one of these Feature Technical Articles:
    Error Propagation in Air Dispersion Modeling
    Calculating Accidental Release Rates From Pressurized Gas Systems
    Source Terms For Accidental Discharge Flow Rates
    Air Dispersion Modeling Conversions and Formulas
    Logic Diagram For Using Briggs' Plume Rise Equations