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Atmospheric Dispersion Modeling

Atmospheric Dispersion ModelingProfessor Tim LarsonCEE 357 Types of Models Source Receptor Dispersion Calculations Wind Tunnel Empirical Scaling Linear Rollback Non-linear (chemistry/deposition) Receptor Source Deduce source fingerprints (statistical) Microscopy (particle shape & composition) Receptor Receptor Forecasting and interpolation Spatial and temporalDilution vs Dispersion :The Importance of Averaging TimeThe instantaneous puffs are dispersed by fluctuating wind directions. Instantaneous Conc. ProfileTime Averaged Profile Puffs of PollutionWindThe instantaneous concentrations are not described by steady-state plume models. The time averaged values are. Dispersion models describe time-average plumesSource: Slade et al Meteorology and Atomic Energy, 1968 instantaneoustime-averagedInstantaneousP lume ShapeTime-averaged plume ShapeHeating of the surfaceUnstable Daytime ConditionsSunny, clear skiescolder, denserairwarmer, lighterairVisible radiation to groundLarge scale vertical motionsCooling of the surfaceStable Nighttime ConditionsClear skiescolder, denserairwarmer, lighterairInfrared radiation to spaceVertical motions suppressed by density gradientNeutral Condi

Gaussian Plume (Concentrations vary with x, y and z) For a given x, the max conc. is at the plume centerline and decreases exponentially away from the centerline at a rate dependent upon the sigma values, y and z. y and z are functions of x Plume Centerline

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