| AEOLIUSQ Emission readme.text |
This file describes the AEOLIUS software that was developed in the
Met Office for use in assessing air quality in street canyons. The software
was designed to assist local authorities in their statutory duties to
Review and Assess air quality under the Environment Act 1995.
It describes AEOLIUS, AEOLIUSQ
and AEOLIUSF. These programs calculate
the air pollutant concentration in a street canyon, given the street
geometry, wind speed, traffic flow and emission factor.
The software was developed during work by A T Buckland, D R Middleton,
A J Manning, Met Office, London Rd, Bracknell, Berkshire RG12 2SZ, UK.
The programs with documentation and example data are available on the
Internet from the Met Office web site http://www.metoffice.gov.uk.
Please add to your bookmark Press (Ctrl +D).
COMPUTER SOFTWARE, EXAMPLE DATA FILES, AND DOCUMENTATION IN THE AEOLIUS
SUITE ARE CROWN COPYRIGHT.
A program for quick and easy screening of likely concentrations of
air pollutants in street canyons it asks the user to input data from
the keyboard. Results are output only on the screen. It is the simplest
program in the AEOLIUS suite. It uses emission factors for the years
1996 to 2005 that are built into the program and the user cannot alter
them. Notes on using AEOLIUS are in AEOLIUS.DOC, written in Microsoft
Word version 6.0.
A program for quick and easy screening of likely concentrations of
air pollutants in street canyons it asks the user to input data from
the keyboard. It is a version of the above AEOLIUS that has been extended
by D R Middleton.
New features:
1. The option to copy the model results into a file. If the chosen
file contains results from earlier runs, the new results are added onto
the bottom of the existing file; the earlier results are not deleted.
If a file is not chosen, results go only to the screen.
2. The option to select the units (e.g. mph) for the speed of
vehicles; the units once selected remain the same during the rest of
the model run.
3. The option to replace the built in emission factors q with
input of new emission factors chosen by the user.
This allows the user to:
-
'Tune' the emissions to suit the local mix of vehicle types
-
Vary the emissions to represent the speed of traffic and/or vehicle
congestion
-
Alter the emissions according to different assumptions about the
likely future emissions, such as in the year 2005 or 2010
-
Conduct parallel runs comparing the effect of selecting emission
factors from a variety of published sources
-
Investigate local values of emission factors with a view to bring
model results more into line with locally obtained measurements.
Care is needed to apply consistent averaging times e.g. 1hour
The new emission factor q must be calculated by the user as a single
number in g/km per average vehicle. The relative proportions or fractions
fi (range 0-1) of the different vehicle types i (range 1 to n) in the
fleet are used as the weighting factors. Each vehicle type will have
its own emission factor qi g/km. The user must calculate the weighted
sum of the emission factors for each vehicle type:
Calculate q = f1.q1 + f2.q2 + f3.q3 ... + fn.qn g/km
The value of q is the emission factor for AEOLIUSQ.
A value q=0.0 is not allowed.
It is expected that the user will often use AEOLIUSQ in preference to
AEOLIUS as a screening program, because of the ability to input emission
factors chosen. The storing of results in a file is also a useful feature.
Notes on using AEOLIUSQ are in AEOLIUSQ.DOC, written in Microsoft Word
version 6.0.
A program to calculate hourly concentrations of air pollutant concentrations
in street canyons, taking account of wind direction and street orientation.
It asks the user to input the file name of a datafile, then uses the
datafile to locate all other files and data.
Results are sent to an output file which must be given a name by the
user. The user puts the name they have chosen for their output filename
into the datafile, along with the names of files holding traffic and
meteorological data etc. Notes on using AEOLIUSF are in AEOLIUSF.DOC,
written in Microsoft Word version 6.0.
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solutions please contact our 24-hour Customer
Centre.
