Develop a spreadsheet to determine the isopleths for a puff at a specified

time after the release of material.

The spreadsheet should contain specific cells for user input of the following

quantities: time after release $($s$),$ wind speed $(2$ m$/$s$),$ total release $($kg$),$

release height $($m$),-$molecular weight of released gas, ambient temperature

$($K$),$ ambient pressure $($atm$),$ and isopleth concentration $($ppm$).$

The spreadsheet output should include, at each point downwind, downwind

location, both y and z dispersion coefficients, downwind centerline

concentration, and $-$isopleth distance off$-$center $(+/2).$

The spreadsheet output should also include a graph of the isopleth location.

For your spreadsheet construction, we suggest that you set up the cells to

move with the puff center. Otherwise, you will need a large number of cells.

Use the spreadsheet for the following case:

Release mass: $0\mathrm{.}5$ kg

Release height: $0$ m

Molecular weight of gas: $30$

Ambient temperature: $298$ K

Ambient pressure: $1$ atm

Isopleth concentration: $1$ ppm

Atmospheric stability: F

Run the spreadsheet for a number of different times, and plot the maximum

puff width as a function of distance downwind from the release.

Answer the following questions:

a$.$ At what distance downwind does the puff reach its maximum width?

b$.$ At what distance and time does the puff dissipate?

$10$

c$.$ Estimate the total area swept out by the puff from initial release to

dissipation.

Your submitted work should include a description of your method of

solution, a complete spreadsheet output at $2000$ s after release, a plot of

maximum puff width as a function of downwind distance, and the calculation

of the total swept area