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Re: gaussian air dispersion model [message #46514 is a reply to message #46503]

Fri, 25 November 2005 09:28

guillaume.drolet.1
Messages: 20
Registered: July 2005

Junior Member

Hi Mark,

The following comes from N. Kljun. She developed the footprint model:

"...you'll get the along-wind extent, but it's a crosswind-integrated
model (no y-information).
the full model gives you the y-information, but is not easy to be
applied and it will be extremely time-consuming to run it for that many
cases as you will have to.
it'll be easier to estimate the y-extent using a simple gaussian
dispersion function."

I'm sorry, I made a mistake in my first post: I need to estimate the
'across-wind' extent (y-extent), and NOT the 'along-wind' (x-extent),
which will be given by the model.

For this simple model, the following inputs are needed:

zm = Measurement height [m]
znot = Roughness length [m]
h = Boundary layer height [m]
sigmaw = sigmaw [m s-1]
ustar = u* [m s-1]
r = Percentage to be included [%]

Some inputs are available from flux towers measurements
(zm,sigmaw,ustar) while others are estimates (znot,h). The outputs are:

xmax: location of maximum influence for the location
xr :distance from receptor which include r% of the area contributing
to the measured flux.

Is that enough information? For more details on the model, see:
http://footprint.kljun.net

Thanks again.

Gui

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[Message index]

		Re: gaussian air dispersion model By: Mark Hadfield on Sun, 27 November 2005 17:27
		Re: gaussian air dispersion model By: guillaume.drolet.1 on Fri, 25 November 2005 09:28
		Re: gaussian air dispersion model By: Mark Hadfield on Thu, 24 November 2005 15:34
		Re: gaussian air dispersion model By: Kenneth P. Bowman on Thu, 24 November 2005 13:41
		Re: gaussian air dispersion model By: guillaume.drolet.1 on Mon, 28 November 2005 09:00

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