Canarina Environmental Software

Canarina DISPER Software · air quality information system · algorithms 4

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Canarina DISPER Software · air quality information system

 

Symbol / Definition

z= Receptor/terrain height above mean sea level (m)

zd= Dry deposition reference height (m)

zr= Receptor height above ground level (i.e. flagpole) (m)

zref= Reference height for wind speed power law (m)

zs= Stack base elevation above mean sea level (m)

zi= Mixing height (m)

z0= Surface roughness height (m)

ß= Entrainment coefficient used in buoyant rise for Schulman-Scire downwash sources = 0.6

ßj= Jet entrainment coefficient used in gradual momentum plume rise calculations FUNC {~=~{1 over 3} + {{u_s} over {v_s}}}

Dh= Plume rise (m)

dq/dz= Potential temperature gradient with height (K/m)

L= Precipitation scavenging ratio (s-1)

l= Precipitation rate coefficient (s-mm/hr)-1

pi = 3.14159

Gamma= Decay coefficient = 0.693/T1/2 (s-1)

yH= Stability adjustment factor (dimensionless)

f= Fraction of mass in a particular settling velocity category for particulates (dimensionless)

rho= Particle density (g/cm3)

rhoAIR= Density of air (g/cm3)

sigy= Horizontal (lateral) dispersion parameter (m)

sigyo= Initial horizontal dispersion parameter for virtual point source (m)

sigye= Effective lateral dispersion parameter including effects of buoyancy-induced dispersion (m)

sigz= Vertical dispersion parameter (m)

sigzo= Initial vertical dispersion parameter for virtual point source (m)

sigze=Effective vertical dispersion parameter including effects of buoyancy-induced dispersion (m)

U=Viscosity of air = 0.15 cm2/s

µ=Absolute viscosity of air = 1.81 x 10-4 g/cm/s

C=Concentration (µg/m3)

cd=Concentration with dry deposition effects (µg/m3)

 

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Canarina DISPER Software · air quality information system

 

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