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Algorithms I · software · environmental assesment

                 

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The mathematical model that the software uses provides options to model emissions from a wide range of sources that might be present at industrial areas and urban areas. The model is analogous to ISC3 from EPA. The basis of the model is the straight-line, steady-state Gaussian plume equation, which is used to model simple point source emissions from stacks, roads, storage piles and conveyor belts. Emission sources are categorized into three basic types of sources: point sources, line sources and area sources. The algorithms used to model each of these source types are described in detail in the following sections. The DISPER dispersion model accepts meteorological data records to define the conditions for plume rise and transport. The model estimates the concentration value for each source and receptor combination and calculates user-selected averages.

Point source emissions 

The model uses a steady-state Gaussian plume equation to model emissions from point sources, such as stacks.

The Gaussian Equation

The model for stacks uses the steady-state Gaussian plume equation for a continuous elevated source. For each source, the origin of the stack coordinate system is placed at the ground surface at the base of the stack. The x axis is positive in the downwind direction, the y axis is crosswind (normal) to the x axis and the z axis extends vertically. The fixed receptor locations are converted to each source's coordinate system. The hourly concentrations calculated for each source at each receptor are summed to obtain the total concentration produced at each receptor by the combined source emissions.

For a Gaussian plume, the hourly concentration at downwind distance x (meters) and crosswind distance y (meters) is given by:

c =(Q K V D/2 pi us sigy sigz) exp[-0.5(y/sigy)2]  (1)

where:

Q= pollutant emission rate (mass per unit time)

K= a scaling coefficient to convert calculated concentrations to desired units (default value of 1 x 106 for Q in g/s and concentration in µg/m3)

V= vertical term (See Section 1.1.6)

D= decay term (See Section 1.1.7)

sigy,sigz= standard deviation of lateral and vertical concentration distribution (m) (See Section 1.1.5)

us= mean wind speed (m/s) at release height (See Section 1.1.3) 

 

 

 

software · environmental assesment

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.

Derry - marine environment - affects of environment - environment protection -

Dundee - policy air pollution - pollution protection - control pollution -

Durham - department of environment air quality - us environmental protection agency air quality - air pollution affecting the environment -

Edinburgh - ministry of the environment air quality - environmental law air pollution - environmental impact of air pollution -

Ely - how air pollution effects the environment - air quality and environmental services - ap environmental science air pollution -

Exeter - environmental engineering air pollution - air pollution to the environment - environment of air pollution -

Glasgow - air pollution effect on environment - impact of air pollution on the environment - effect of air pollution on the environment -

Gloucester - air pollution affects the environment - environmental problems air pollution - clark county department of air quality and environmental management -

Hereford - the effects of air pollution on the environment - how does air pollution effect the environment - environmental protection agency air pollution -

Inverness - indoor environmental air quality - environmental air quality testing - alberta environment air quality -

Norwich - how to reduce air pollution - light pollution - ocean pollution -

Nottingham - pollution solutions - sources of pollution - traffic pollution -

Oxford - sources of air pollution - indoor air pollutants - air pollution graphs -

Peterborough - so2 - clean air - air pollution control -

Westminster -  gaussian air dispersion - dispersion in air - air pollution dispersion modelling -

Winchester - SOx air pollution dispersion simulation near hospitals - NOx air pollution dispersion model - VOC air pollution modeling in plants -

Kingston upon Hull - how does air pollution affect the environment - air pollution environmental effects - national environment protection measure for ambient air quality -

Lancaster - industry environment -

Leeds - effect of pollution - effect air pollution - oil pollution -

Leicester - environment activities - impact air pollution - ecological environment -

Lichfield - deforestation environment - ecological pollution - deforestation pollution -

Lincoln - land pollution - pollution global warming - enviromental pollution - water pollution -

Lisburn - air pollution on environment - environmental science air pollution - air pollution in the environment -

Liverpool - natural air pollution - human pollution - natural pollution -

Manchester - climate change air pollution - humans environment - health pollution -

Newcastle upon Tyne - effects of air pollution on the environment - air pollution on the environment - effects of air pollution on environment -

Newport - environment air pollution - environmental air quality - environmental air pollution -

Newry - air pollution and environment - national environmental management air quality act - effect of air pollution on environment -

Norwich - environmental protection agency air quality - air pollution effects on environment - clean air and environmental quality -

Nottingham - air pollution and the environment - air quality environment - environmental quality clean air regulations 1978 -

Oxford - better air quality - recycling - sustainable development - clean air -

 

Carlisle - environmental assessment and remediation - strategic environmental assessment scotland - guidelines for environmental risk assessment and management -

Chester - environmental assessment study - environmental assessment scotland act - environmental assessment method -

Chichester - environmental assessment review - environmental assessment reports - phase 2 environmental site assessment -

City of London - guidelines for environmental risk assessment - environmental assessment registry - the environmental planning and assessment act 1979 -

Coventry - environmental consultant - environmental consulting - environmental management -

Derby - environmental consultants - environmental audits - phase i esa -

Winchester - ecological assessment - phase i environmental - phase i assessment -

Wolverhampton - environmental law - environmental testing - phase 1 site assessment -

Worcester - environmental consulting firm - ecology assessment - environmental planning -

York - sustainable assessment - environmental issues - environmental remediation -

Northumberland - africa projects - community projects - consulting projects -

North Yorkshire  - environmental economic development -

Wiltshire - environmental industry - land use projects - land project -

Lincolnshire - eu projects - fisheries projects - funding projects -

Cumbria  - environmental strategies -

Hampshire - environmental climate change -

Norfolk - assessment projects -

Cornualles - environmental fund - environmental land use - environmental economic -

Shropshire -  transport projects - construction projects -

Exeter -  environmental grou - environmental department - grants projects -

Glasgow - environmental guidelines - environmental rural - cooperation projects

Gloucester - world bank environmental - environmental initiative - study projects -

Newcastle upon Tyne - air pollution modeling - monitoring pollution - food analysis -

Newport - statistics analysis - logistic regression analysis - air pollution laboratory -

Newry - air pollution modelling - statistical analysis - hplc analysis -

Norwich - air pollution measurement - air pollution comparison - air pollution gis -

Nottingham - air gas - air pollution standard - air pollution simulation - air pollution sampling -

Oxford - correlation analysis - analytical analysis - air pollution methods -

Peterborough - air flow analysis - environment pollution - air pollution detection -

Plymouth - air pollution model - air pollution pdf - gas chromatography analysis -

Portsmouth - water pollution analysis - air pollution statistic -