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SOLUTIONS: DISPER  

solutions

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DEMO

COMMANDS:

Input data I

Input data II

Input data III

Input data IV

average

Import

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

The Vertical Term

The Vertical Term (V) accounts for the vertical distribution of the Gaussian plume. It includes the effects of source elevation, receptor elevation and plume rise. In addition to the plume height, receptor height and mixing height, the computation of the Vertical Term requires the vertical dispersion parameter (sig_z). The Vertical Term without deposition effects is then given by:

V= exp{-0.5 [(z_r-h_e)/ sig_z]²}+exp{-0.5 [(z_r+h_e)/ sig_z]²}+

+{exp[-0.5 (H₁/sig_z)²]+exp[-0.5 (H₂/sig_z)²]}_i=1,2,...+

+{exp[-0.5 (H₃/sig_z)²]+exp[-0.5 (H₄/sig_z)²]}_i=1,2,...(34)

where:

h_e = h_s + Dh

H₁ = z_r - (2iz_i - h_e)

H₂ = z_r + (2iz_i - h_e)

H₃ = z_r - (2iz_i + h_e)

H₄ = z_r + (2iz_i + h_e)

z_r = receptor height above ground (flagpole) (m)

z_i = mixing height (m)

The infinite series term in Equation {} accounts for the effects of the restriction on vertical plume growth at the top of the mixing layer. This equation assumes that the mixing height in rural and urban areas is known for all stability categories.

The model make the following assumption about plume behavior in elevated simple terrain (terrain that exceeds the stack base elevation but is below the release height):

• The plume axis remains at the plume stabilization height as it passes over elevated or depressed terrain.

• The mixing height is terrain following.

• The wind speed is a function of height above sea level.

Thus, a modified plume stabilization height h_e_ is substituted for the effective stack height h_e in the Vertical Term given by Equation (1-50). For example, the effective plume stabilization height at the point x, y is given by:

h^’_e=h_e+z_s-z_(x,y)           (35)

where:

z_s= height above mean sea level of the base of the stack (m)

z_(x,y)= height above mean sea level of terrain at the receptor location (x,y) (m) 

It should also be noted that, the ISC models truncate terrain at stack height as follows: if the terrain height z - z_s exceeds the source release height, the elevation of the receptor is automatically chopped off at the physical release height. The user is cautioned that concentrations at these complex terrain receptors are subject to considerable uncertainty.

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

Air pollution map (XY-Plane) produced by continuous discharge in time (three stacks). The red colour represents high pollutant concentrations. Wind: SW (225 degrees).

Pollution map (XY-Plane) produced by continuous discharge in a road region. The fucshia squares represent the road line (position of the different point sources) in a XY-Plane. The red colour represents high pollutant concentrations.

Canarina Algoritmos Numéricos, S.L.

Environmental software solutions

Software para impacto del medio ambiente  

Canary Islands, Spain

e-mail: contact us

CANARINA: Home - Air pollution · DISPER - Noise pollution · CUSTIC - Water pollution · DESCAR - Contact us

DISPER: Air pollution dispersion · DISPER - Solutions - Data - Algorithms - Emissions - Graphs - ISC3 (VOL. 2)

SOLUTIONS: Air pollution dispersion · DISPER - Software solutions - Software advantages - Price - 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

DISPER software solutions: This application has been used in great number of environmental reports, air pollution courses and air pollution studies in the last years. We currently have users in more than 10 countries.

Copyright © 2005 Canarina Algoritmos Numéricos, Sociedad Limitada Unipersonal CIF-B38803110 registered for electronic commerce in sheet TF-35526, sheet 1 of the volume 2.671 of the General Section, First Registration, Registro de la Propiedad Número 2 y Marcantil of , Spain. All rights reserved.