An Outline of Lagrangian Stochastic Dispersion Models
225
a smaller computational and time effort than CFD models, producing a good quality
and accuracy of the dispersion simulation. These aspects make Lagrangian models
suitable tools for applicative environmental assessment and emergency response.
The aim of these modeling studies is the assessment of air quality impact, in
terms, for instance, of NO 2 or NO x and PM10, for single source emissions, such as
power plants or incinerators, and linear emissions from vehicular traffi c in highways and large roads. This is useful for supporting the decision-making process of
local authorities for the construction authorization or control of pollutant sources
and the protection of the public health. This kind of studies is needed to characterize
and quantify the contribution to the environment pollution of emission from stacks,
evaluating their impacts on the air quality.
In the following, we summarize some results from real case studies, where
SPRAY, within RMS system, was used. As an example, we refer to a recent study
5502
546 557 567 577
2 0 0
20 0
2 0 0
2 0 0
20 0
2 0 0
40
0
4 0 0
800
6 0 0
8 0 0
8 0 0
8 0 0
80 0
587 597 607
5492
5482
5472
5462
5452
5441
(a)
5548
5499
5449
5400
20 0
2 0 0
200
1 0 0 0
1000
40 0
4 0 0
4 0 0
4 0 0
4 0 0
6 0 0
8 0 0
6 0 0
600
6 0 0
80 0
8 0 0
80 0
80 0
8 0 0
80 0
509
558
608
657
(b)
5634
5482
5330
471
623
775
4 0 0
20 0
400
4 0 0
400
40 0
40 0
6 0 0
6 0 0
60 0
60 0
80 0
80 0
8 0 0
8
0
0
1000
1 2 0 0
15 00
1400
1000
800
4 0 0
4 0 0
2 0 0
(d)
471
623
400
4 0 0
4 0 0
40 0
40 0
6 0 0
6 0 0
400
4 0 0
40 0
60 0
80 0
8
0
0
80 0
800
1000
1000
1 2 0 0
16 00
14 00
8 0 0
8 0 0
2 0 0
2 0 0
775
(c)
5634
5482
5330
Kraichgau valley
Neckar valley
Black forest
Vosges
Rhine
valley
FIGURE 8.2 (See color insert following page 234.) Particle positions and wind fi eld for
10 m terrain-following surface on 16 September 1992 at different hours: (a) grid 3, 06 UTC;
(b) grid 2, 08 UTC; (c) grid 1, 12 UTC; (d) grid 1, 16 UTC.
© 2010 by Taylor and Francis Group, LLC
225
a smaller computational and time effort than CFD models, producing a good quality
and accuracy of the dispersion simulation. These aspects make Lagrangian models
suitable tools for applicative environmental assessment and emergency response.
The aim of these modeling studies is the assessment of air quality impact, in
terms, for instance, of NO 2 or NO x and PM10, for single source emissions, such as
power plants or incinerators, and linear emissions from vehicular traffi c in highways and large roads. This is useful for supporting the decision-making process of
local authorities for the construction authorization or control of pollutant sources
and the protection of the public health. This kind of studies is needed to characterize
and quantify the contribution to the environment pollution of emission from stacks,
evaluating their impacts on the air quality.
In the following, we summarize some results from real case studies, where
SPRAY, within RMS system, was used. As an example, we refer to a recent study
5502
546 557 567 577
2 0 0
20 0
2 0 0
2 0 0
20 0
2 0 0
40
0
4 0 0
800
6 0 0
8 0 0
8 0 0
8 0 0
80 0
587 597 607
5492
5482
5472
5462
5452
5441
(a)
5548
5499
5449
5400
20 0
2 0 0
200
1 0 0 0
1000
40 0
4 0 0
4 0 0
4 0 0
4 0 0
6 0 0
8 0 0
6 0 0
600
6 0 0
80 0
8 0 0
80 0
80 0
8 0 0
80 0
509
558
608
657
(b)
5634
5482
5330
471
623
775
4 0 0
20 0
400
4 0 0
400
40 0
40 0
6 0 0
6 0 0
60 0
60 0
80 0
80 0
8 0 0
8
0
0
1000
1 2 0 0
15 00
1400
1000
800
4 0 0
4 0 0
2 0 0
(d)
471
623
400
4 0 0
4 0 0
40 0
40 0
6 0 0
6 0 0
400
4 0 0
40 0
60 0
80 0
8
0
0
80 0
800
1000
1000
1 2 0 0
16 00
14 00
8 0 0
8 0 0
2 0 0
2 0 0
775
(c)
5634
5482
5330
Kraichgau valley
Neckar valley
Black forest
Vosges
Rhine
valley
FIGURE 8.2 (See color insert following page 234.) Particle positions and wind fi eld for
10 m terrain-following surface on 16 September 1992 at different hours: (a) grid 3, 06 UTC;
(b) grid 2, 08 UTC; (c) grid 1, 12 UTC; (d) grid 1, 16 UTC.
© 2010 by Taylor and Francis Group, LLC