Canarina Environmental Software

Canarina DISPER Software · atmospheric dispersion model · algorithms 6

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Canarina DISPER Software · atmospheric dispersion model

 

9.1 Point source emissions

 

The model uses a steady-state Gaussian plume equation to model emissions from point sources, such as stacks.

 

9.1.1 The Gaussian Equation

 

The model for stacks uses the steady-state Gaussian plume equation for a continuous elevated source. For each source, the origin of the stack coordinate system is placed at the ground surface at the base of the stack. The x axis is positive in the downwind direction, the y axis is crosswind (normal) to the x axis and the z axis extends vertically. The fixed receptor locations are converted to each source's coordinate system. The hourly concentrations calculated for each source at each receptor are summed to obtain the total concentration produced at each receptor by the combined source emissions.

For a Gaussian plume, the hourly concentration at downwind distance x (meters) and crosswind distance y (meters) is given by:

 

c =(Q K V D/2 pi us sigy sigz) exp[-0.5(y/sigy)2]  (1) 

 

where:

Q= pollutant emission rate (mass per unit time)

K= a scaling coefficient to convert calculated concentrations to desired units (default value of 1 x 106 for Q in g/s and concentration in µg/m3)

V= vertical term (See Section 1.1.6)

D= decay term (See Section 1.1.7)

sigy,sigz= standard deviation of lateral and vertical concentration distribution (m) (See Section 1.1.5)

us= mean wind speed (m/s) at release height (See Section 1.1.3)

 

 

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Canarina DISPER Software · atmospheric dispersion model 

It is interesting for meteorology, dispersion modeling, air pollution, air dispersion, atmospheric dispersion model, atmospheric modeling, air pollutant distribution and organic air pollutants.

 

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