Calculating of air diffusion parameters in Nanpiao area

According to the observational data from a field balance-ball in Nanpiao area,a series of air diffusing parameters in different stabilization were calculated.These parameters obtained in different atmospheric stabilization were compared with other material values.As a result,the values of σ_y and σ_z in different atmospheric conditions were higher than those from Briggs expressions in the same rank for the comparatively complex topographty in Nanpiao area.It indicated that the result of this experiment only can be used in calculating the letting smoke pervasion of far distant and high headstream.When the distance was within 2 kilometers,other experiment results ought to be used.