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Plumes gaussiani nellaria FISICA AMBIENTALE 1 Antonio Ballarin Denti a.ballarindenti@dmf.unicatt.it

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Horizontal transport of pollutants in the atmosphere DistanceTime scale Seconds Hours Days Months Years 1 – 10 m 3 – 30 km 100 – 1000 km Hemisphere Globe

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Vertical transport of pollutants in the atmosphere. Time scales for vertical transport of pollutants from the ground to the layers indicated. The boundaries of the layers vary with day and night. The troposphere determines the weather The stratosphere acts as a lid LayerExtensionTime scale Boundary layer Troposphere Stratosphere Minutes to hours Days to weeks Years Ground - 100 m/3 km 100 m/3 km - 10 m/15 km 10 m/15 km - 50 km

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PLUMES SHAPES FROM A HIGH CHIMNEY FOR SEVERAL STABILITY CONDITIONS Adiabatic T profiles as a function of altitude and the drawn curves the realprofile for several cases Behaviour of a parcel of air, reflected in the plume shape on the right

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Sorgente emissiva puntuale e costante

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Dispersion coefficients and as a funcion of the distance from the source for the atmospheric stability conditions.

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Plume gaussiani da un camino alto A livello del suolo : Lungo lasse del plume y = 0

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Ground level concentration underneath the axis of a horizontal plume. Here a = σ y / σ z

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Determinazione diretta di s y e s z

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Pasquil stability categories

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