Canarina DISPER software · air · environment health and safety management
All Conditions - Distance Less Than Distance to Final Rise.
Where gradual rise is to be estimated for unstable, neutral, or stable conditions, if the distance downwind from source to receptor, x, is less than the distance to final rise:
he=hs+1.60 [(Fb x2)1/3/us] (21)
This height will be used only for buoyancy dominated conditions; should it exceed the final rise for the appropriate condition. For momentum dominated conditions, the following equations are used to calculate a distance dependent momentum plume rise:
a) unstable conditions:
where x is the downwind distance, with a maximum value xmax: