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DISPER software: Air pollution map produced by three different stacks (XZ-plane)
Canarina software for analysis of air pollution in environment: air pollution control, environmental engineering, environmental consultancy service, environment simulation, environmental modeling and environmental impact assessment. Air dispersion software: ISC 137 air monitoring
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DISPER: Air pollution dispersion ˇ DISPER - Solutions - Data - Algorithms - Emissions - Graphs - ISC3 (VOL. 2)
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In order to avoid abrupt
changes in the concentrations at the sector boundaries with the numerical
integration algorithm, a linear interpolation is used to determine the
frequency of occurrence of each wind direction used for the individual
simulations within a sector, based on the frequencies of occurrence in the
adjacent sectors. This
"smoothing" of the frequency distribution has a similar effect as the
smoothing function used for the ISC Long Term point source algorithm, described
in Section 2.1.8. The frequency of
occurrence of the jth wind direction between sectors i and i+1 can
be calculated as:
|
|
where:
Fi = the
frequency of occurrence for the ith sector
|
Fi+1 |
= the
frequency of occurrence for the i+1th sector |
|
Θi |
= the
central wind direction for the ith sector |
|
Θi+1 |
= the
central wind direction for the i+1th sector |
|
θij |
= the
specific wind direction between Θi and Θi+1 |
|
fij |
= the
interpolated (smoothed) frequency of occurrence for the specific wind
direction θij |
