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The Dispersion Parameters

Point Source Dispersion Parameters:

Equations that approximately fit the Pasquill-Gifford curves are used to calculate sig_y and sig_z (in meters) for the rural mode. The equations used to calculate sig_y are of the form:

sig_y=465.11628 x tan (TH) (29)

where:

TH=0.017453293[c - d ln(x)] (30)

In both Equations the downwind distance x is in kilometers. The equation used to calculate sig_z is of the form:

sig_z=ax^b (31)

where the downwind distance x is in kilometers and sig_z is in meters.

Procedures Used to Account for Buoyancy-Induced Dispersion

The method of Pasquill is used to account for the initial dispersion of plumes. With this method, the effective vertical dispersion s_ze is calculated as follows:

sig_ze=[sig_z² +(Dh/3.5)]^1/2 (32)

where sig_z is the vertical dispersion due to ambient turbulence and Dh is the plume rise due to momentum or buoyancy. The lateral plume spread is:

sig_ye=[sig_y² +(Dh/3.5)]^1/2 (33)

where sig_y is the lateral dispersion due to ambient turbulence. It should be noted that Dh is the distance-dependent plume rise if the receptor is located between the source and the distance to final rise, and final plume rise if the receptor is located beyond the distance to final rise.

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: W (270 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: NE (45 dregrees) and 145 degrees.

Canarina Algoritmos Numéricos, S.L.

Environmental software solutions

Software for environmental impact

Canary Islands, Spain

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atmospheric pollution

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.

Lincoln - environmental health problems - environmental health inspector - alameda county environmental health -

Newcastle upon Tyne - environmental health institute - environmental health food - environmental health conference -

Newport - environmental health division - environmental health job - division of environmental health -

Newry - nc environmental healt - national environmental health - local environmental health - air quality criteria

Norwich - dept of environmental health - environmental health policy - environmental health technician -

Nottingham - georgia environmental health - environmental health risks - occupational and environmental health -

Surrey - msc environmental health - environmental health training - environmental health center dallas - environmental health officer jobs - santa clara county environmental health - environmental health hazard - international journal of environmental health research - air quality criteria

Northamptonshire - environmental health careers - riverside county environmental health - jobs in environmental health - international journal of occupational and environmental health - environmental health program - international journal of environmental health - los angeles county environmental health - institute for environmental health -

Somerset - san diego environmental health - student environmental health - environmental health authority - environmental health leeds - san mateo county environmental health - journal of environmental health research - sc department of health and environmental control - office of environmental health hazard assessment - environmental health regulations

Cornualles - environmental health scotland - environmental health london - environmental health engineering - environmental health birmingham - student environmental health officer -

Cambridgeshire - kern county environmental health - environmental health course - environmental health law -

Derby - environmental health foundation - environmental health edinburgh - environmental health programs -

Derry - environmental health and engineering - environmental health education - environmental health -

Dundee - san diego county environmental health - air quality criteria

Hampshire - environmental health fund - air quality criteria

Northumberland - environmental health indicators - air quality criteria

Devon - environmental health vacancies - florida environmental health - environmental health issue -

North Yorkshire - environmental protection - protect the environment -

Lincolnshire - environmental studies - environmental - air quality criteria

Canterbury - environmental health risk - environmental health management - occupational environmental health -

Cardiff - environmental science and health - environmental health practitioners - environmental health bristol -

Northumberland - indoor air quality - indoor air quality test -

Staffordshire - improving indoor air quality - indoor air pollutants -

Cambridgeshire - indoor air quality testing mold -

Lincolnshire - indoor air quality certification - indoor air quality mold - indoor air quality solutions -

Carlisle - indoor air quality monitoring - american indoor air quality council -

Chester - residential indoor air quality - indoor air quality meter -

Chichester - indoor air quality problem - indoor air quality schools -

City of London - indoor air pollution - indoor air quality association - indoor air quality monitor -

Coventry - indoor air quality consultant - improve indoor air quality - indoor air quality control -

Derby - indoor air quality measurement - indoor air quality product - indoor air quality consultants -

Derry - chemicals toxic - toxic hazard - toxic risk assessment -

Dundee - toxic exposure - benzene toxic - toxic risk -

Durham - indoor air quality problems - indoor air quality tests - indoor air quality standard -

Edinburgh - asbestos toxic - toxic inhalation - toxic hazards -

Ely - indoor air hazards - toxic dust - toxic health -

Exeter - toxic waste - air pollution - indoor air pollution -

Glasgow - indoor air quality systems - indoor air - indoor air quality -

Gloucester - epa indoor air quality - indoor air quality standards - indoor air quality testing -

Gloucestershire - indoor air quality system -

Devon - toxic fumes -

Northamptonshire - indoor air contamination -

Somerset - benzene lawyer - formaldehyde - benzene attorney -

Aberdeen - toxic environment - dangerous toxic - toxic study - toxic gas -

Armagh - asbestos - effects of air pollution - benzene

Bangor - indoor air mold - indoor air pollutants - indoor air toxic -

Bath - non toxic - indoor air monitoring - indoor air standards -

Belfast - indoor air environment - toxic poisoning - indoor air epa -

Birmingham - benzene lawsuit - air quality monitoring

Bradford - indoor air health - toxic effects - toxic drinking water -

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