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__
The Dispersion Parameters__

__
Point Source Dispersion Parameters:__

Equations that approximately fit the Pasquill-Gifford curves are used to
calculate sig_{y} and sig_{z} (in meters) for the rural
mode. The equations used to calculate sig_{y} are of the form:

sig_{y}=465.11628 x tan (TH)
(29)

where:

TH=0.017453293[c - d ln(x)]
(30)

In
both Equations the downwind distance x is in kilometers. The equation used
to calculate sig_{z} is of the form:

sig_{z}=ax^{b}^{
}
(31)

where the downwind distance x is in kilometers and sig_{z} is in
meters.

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Procedures Used to Account for
Buoyancy-Induced Dispersion__

The
method of Pasquill is used to account for the initial dispersion of plumes.
With this method, the effective vertical dispersion s_{ze} is
calculated as follows:

sig_{ze}=[sig_{z}^{2}
+(Dh/3.5)]^{1/2}^{
}
(32)

where sig_{z} is the vertical dispersion due to ambient turbulence
and Dh is the plume rise due to momentum or buoyancy. The lateral plume
spread is:

sig_{ye}=[sig_{y}^{2}
+(Dh/3.5)]^{1/2}^{
}
(33)

where sig_{y} is the lateral dispersion due to ambient turbulence.
It should be noted that Dh is the distance-dependent plume rise if the
receptor is located between the source and the distance to final rise, and
final plume rise if the receptor is located beyond the distance to final
rise.

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Algorithms I -
Algorithms
II -
Algorithms III -
Algorithms IV -
Algorithms V -
Algorithms VI -
Algorithms VII -
Algorithms VIII -
Algorithms IX -
Algorithms X

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Air
pollution map (XY-Plane) produced by continuous discharge in time (three
stacks).
The red colour represents
high pollutant
concentrations. Wind: W (270 degrees).

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**

Air
pollution map (XY-Plane) produced by continuous discharge in time. The
fucshia lines represents
a stacks in the XY-Plane.
The red colour represents
high pollutant concentrations. Winds: NE (45 dregrees) and 145
degrees.

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Canarina Algoritmos
Numéricos, S.L.

Environmental software solutions

Canary Islands, Spain

e-mail:
contact us

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DISPER:
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pollution
dispersion ˇ DISPER__ -
Solutions -
Data -
Algorithms -
Emissions -
__
Graphs__ -
ISC3 (VOL. 2)

SOLUTIONS: __
Air pollution
dispersion ˇ DISPER__ -
Software
solutions -
Software advantages -
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DEMO download

COMMANDS:
Input data I -
Input data II -
Input data III -
Input data IV -
Temporal average -
Import and export data -
Software commands

ALGORITHMS:
Algorithms I -
Algorithms
II -
Algorithms III -
Algorithms IV -
Algorithms V -
Algorithms VI -
Algorithms VII -
Algorithms VIII -
Algorithms IX -
Algorithms X

EMISSIONS:
Emissions I -
Emissions II -
Emissions III -
Pollutants I -
Pollutants II

GRAPHS:
__
Graphs I__ -
__
Graphs II__ -
__
Graphs III__ -
__
Graphs IV__