CANARINA:
DISPER:
SOLUTIONS: DISPER
COMMANDS:
ALGORITHMS:
EMISSIONS:
GRAPHS:
Downwind and Crosswind Distances
The model uses a Cartesian receptor network. All receptor points are converted to Cartesian (X,Y) coordinates prior to performing the dispersion calculations. In the Cartesian coordinate system, the X axis is positive to the east of the user-specified origin and the Y axis is positive to the north. The user must define the location of each source with respect to the origin of the grid using Cartesian coordinates. If the X and Y coordinates of the source are X(S) and Y(S), the downwind distance x to the receptor, along the direction of plume travel, is given by:
x=-[X(R)-X(S)]sin(WD)-[Y(R)-Y(S)]cos(WD) (2)
where WD is the direction from which the wind is blowing. The downwind distance is used in calculating the distance-dependent plume rise and the dispersion parameters. The crosswind distance y to the receptor from the plume centerline is given by:
y=-[X(R)-X(S)]cos(WD)-[Y(R)-Y(S)]sin(WD) (3)
Wind Speed Profile
The wind power law is used to adjust the observed wind speed, uref, from a reference measurement height, zref, to the stack or release height, hs. The stack height wind speed, us, is used in the Gaussian plume equation. The power law equation is of the form:
us=uref(hs/zref)p (4)
where p is the wind profile exponent. Values of p may be provided by the user as a function of stability category and wind speed class. Default values are as follows:
|
Stability Category |
Rural Exponent |
Urban Exponent |
|
A |
0.07 |
0.15 |
|
B |
0.07 |
0.15 |
|
C |
0.10 |
0.20 |
|
D |
0.15 |
0.25 |
|
E |
0.35 |
0.30 |
|
F |
0.55 |
0.30 |
The stack height wind speed, us, is not allowed to be less than 1.0 m/s.
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: SE (135 degrees).
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: E (90 dregrees) and 70 degrees.
Canarina Algoritmos Numéricos, S.L.
Environmental software solutions
Software para impacto del medio ambiente
Canary Islands, Spain
e-mail: contact us
European network on pollution · European Union
Member of MAPO: European network on Marine Pollution. Project
funded by the European Commission through the
6th Framework Programme for Research and Development
gaussian dispersion
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.
Chichester - air pollution dispersion - dispersion of air pollution - gaussian air dispersion equation -
City of London - air pollution dispersion models - air pollution dispersion model - air dispersion equation -
Coventry - air voc - air indoor - industrial dispersion - air modelling - environment air quality
Derby - air modeling - dust dispersion - air parameters - environment air quality
Derry - air model - air dust - dispersion diffusion - environment air quality
Dundee - air pollution meteorology and dispersion - dispersion of air pollutants - and dispersion of air pollutants -
Durham - co2 dispersion - atmosphere dispersion - air transport - environment air quality
Edinburgh - air industrial - air atmosphere - control air - environment air quality
Ely - air diffusion - air reflection - air calculation - environment air quality
Exeter - air mixing - air refraction - dispersion simulation -
Glasgow - air gas - air process - air simulation -
Gloucester - air equation - air pression - dispersion light -
Hereford - air co2 - air algorithm - air temperature -
Manchester - pressure dispersion - process dispersion -
Preston - air quality dispersion models - air quality dispersion model - air dispersion models -
Stoke-on-Trent - air standards - pollution air - air monitoring -
Sunderland - air emissions - air environment - dispersion equation - air source -
Swansea - air emission - data dispersion - air environmental -
Truro - pollutants dispersion - air levels - air pollutants -
Wakefield - air epa - air smog - dispersion calculation -
Wells - air pollutant - air models - air stability -
Westminster - air stack - air concentration - air health -
Huelva:
air pollution software -Guipuzcoa: agriculture air pollution -
Ceuta: effect of air pollution -
Castellón: causes of pollution - marine pollution - pollution problems -
Guadalajara: environment ecosystem - industry pollution - pollution pollutants -
Granada: affects of air pollution - study environment - oil environment -
Girona: human environment - effect on air pollution - environment economy -
Cuenca: impact pollution - environment resources - emission pollution - environment impacts -
Córdoba: environment protection - policy air pollution - pollution protection -
Ciudad Real: pollution prevention - pollution control - ozone - emissions -
Cantabria: environmental effects of air pollution -
Cádiz: air pollution effects on the environment - environmental issues air pollution -
Burgos: ministry of environment air quality - environment agency air quality - clean air & environmental quality -
Cáceres: environmental impacts of air pollution -
Bizkaia: environmental health air pollution - air pollution effects environment - air pollution effects the environment -
Ávila: air pollution in environment - environmental quality clean air regulations - how air pollution affects the environment -
Almería:national environment protection ambient air quality measure -
Asturias: air pollution affect the environment - environment air polution -
Alicante: human pollution -
Badajoz: acid rain pollution - environment water pollution - soil pollution -
Albacete:marine air pollution - climate air pollution - health air pollution -
Barcelona: environment ecosystem - industry pollution - pollution pollutants -
A Coruña: waste pollution - epa pollution - pollution emissions -
Zaragoza: emission pollution - environment impacts - effect of environment -
Chichester - mining air pollution - environment issues - acid rain environment -
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