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5-12. The most direct approach is to use a coordinate system that is fixed on the ground at the
release point. Thus, Equation 5-25 is used with Equation 5-27. This gives,
2
2
*
3/2
1 1
2 2
2
m r
z x
x y z
Q H x ut
Note that ut is the location of the center of the puff.
In order to reduce the number of spreadsheet cells, use a spreadsheet grid that moves with
the puff center. Use, let’s say, 50 cells on either side of the puff and specify a cell
increment size.
The procedure is the following:
The printout of the spreadsheet at 2000 s is shown below.
On the plot shown, the x-axis is the distance downwind and the y-axis is the cross-wind
direction.
The results are shown and plotted on the spreadsheet pages attached.
20
5-13. Notes on Problem 5-30
Procedure:
Results:
The spreadsheet output is shown below.
