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1.1.4.10 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, the equivalent of Equation 2 of Briggs ((1972), p. 1030) is used to determine plume height:

This height will be used only for buoyancy dominated conditions; should it exceed the final rise for the appropriate condition, the final rise is substituted instead.

     For momentum dominated conditions, the following equations (Bowers, et al, 1979) are used to calculate a distance dependent momentum plume rise:

  a) unstable conditions:

where x is the downwind distance (meters), with a maximum value defined by xmax as follows:

  b) stable conditions:

where x is the downwind distance (meters), with a maximum value defined by xmax as follows:

The jet entrainment coefficient, βj, is given by,

As with the buoyant gradual rise, if the distance‑dependent momentum rise exceeds the final rise for the appropriate condition, then the final rise is substituted instead.

 

 

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  APLICACIONES castellano: DIS CUS DES  RAD   english: DIS CUS DES RAD  

 

 português: DIS CUS DES RAD   italiano:   DIS CUS  DES RAD

 

français:  DIS CUS DES RAD