﻿ Calculation of Plume dispersion equation

# Calculation of Plume dispersion equation

 1 Downwind distance：x direction m - 2 Downwind distance：y direction m - 3 Downwind distance：z direction(Height) m - 4 Volume of emit gas：Q N・m^3/s - 5 Wind speed to x direction：u m/s - 6 Effective chimney height：He m - 7 Pasquill Stability Categories A B C D E F G - 8 Graph(y-axis Max：20,000m) x-axis：x(m),y-axis：C(x,y,z) Plot Input Data： YesNo , Figure： OnOff
:Export Graph Image.

## Keyword

Plume dispersion equation,Downwind distance,Volume of emit gas,Wind speed,Effective chimney height,Stability categories

## Reference

[1]：公害研究対策センター：『窒素酸化物総量規制マニュアル』,pp.152
[2]：社団法人土木学会：『環境工学公式・モデル・数値集』,pp.253

## Remarks

・Concentration of emissions：C(x,y,z)
・Downwind distance(m)：x,y,z
・Dispersion Coefficient(m)：σy,σz
・Caution：Cautioned about result when input downwind distance from a source is less than 100m or more than 100,000m.
・Pasquill Stability Categories
 Surface wind speed at 10m(m/s) Insolation Night - Strong Moderate Slight ≧ 4/8 Low Cloud ≦ 3/8 Cloud ＜2 A A-B B G G 2-3 A-B B C E F 3-5 B B-C C D E 5-6 C C-D D D D ＞6 C C D D D