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     The profile correction factor P(x,z) is given by 

where R(z,zd) is an atmospheric resistance to vertical transport that is derived from Briggs' formulas for σz (Gifford, 1976).  When the product vgR(z,zd) is of order 0.1 or less, the exponential function is approximated (for small argument) to simplify P(x,z):

This simplification is important, since the integral in Equation (1-57a) is evaluated numerically, whereas that in Equation (1-57b) is computed using analytical approximations.

     The resistance R(z,zd) is obtained for the following functional forms of σz defined by Briggs:

For this last form, the x(z) and x(zd) must be solved for z and zd (respectively) by finding the root of the implicit relation

The corresponding functions for P(x,zd) for the special case of Equation (1-57) are given by:

 

 

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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