133


1.4- o

 x*


 1.2- 4 4
 o 10



 1.0
 0
 o



0.8- -

 0


0.6-




0.4

 e


0.2 I
 10-4 1t3 12 10t


 Z*
 zo

 Figure 5-38. The horizontal dispersion coefficient a versus the
 Y
 dimensionless roughness length for two values of the
 downwind distance.