Hi Miguel!
Thank you for your answer.
I agree with you that metro should not compute the salt concentration on the
road. There are too many factors that need to be included in the model to do
this, i.e. salt type, salt amount, weather, traffic, etc. A more feasible way
is to include the freezing point (FP) in the model. The FP can be calculated by
a separate model provided by the user.
I will need to insert a time series of FP in metro. To do this, the FP will be
a vector and not a constant. Can FP be indexed like the other variables as a
continuous variable?
Is it possible to insert the FP as wind direction and change FP before it is
used in the calculations?
It would be a quite good idea to have the possibility to have an extra variable
in metro that can be used for testing different things. Now the wind direction
is not used, so it can be used, but it could be named in a different way.
Best regards,
Esben
--- Den ons 2008-10-15 skrev Miguel Tremblay <[EMAIL PROTECTED]>:
Från: Miguel Tremblay <[EMAIL PROTECTED]>
Ämne: Re: [Metro-developers] Salting
Till: "'[email protected]'" <[email protected]>
Datum: onsdag 15 oktober 2008 16.56
Esben Almqvist wrote:
> Hi Metro developers!
>
> How would one go about to include the effect of salting in the model.
> It should be possible to lower the freezing point, but it is difficult
> to know how much and for how long. The amount of salt may vary from
> when the model is started until it has reached the last forecast hour,
> so it is not always possible to have the freezing point as a constant.
> What are the thoughts about this? Is there a module to handle this
> type of problem?
> Best regards,
> Esben
>
>
>
Hi Esben,
There is currently no way to handle this in METRo. You can manually
change the value in the macadam.c file and recompile (line 190, "double
dFp=0.0", FP standing for freezing point).
It is possible to modify METRo to do what you want to do. However, this
would need a lot of parametrization. We would need to modify the input
format of METRo (or add an option that permits to use this option). You
would need either to provide a freezing point "forecast" or modify
the
fortran model to dynamically compute the freezing point (based on the
salt type, concentration?).
If you want to add a freezing point forecast, it can be done. The
computation of dynamic freezing point needs a lot of information and I
am not sure we want to go this way.
Regards,
Miguel
--
Miguel Tremblay
Physicien - Physicist
Centre météorologique canadien - Canadian meteorological centre (CMC)
Environnement Canada - Environment Canada
http://www.ec.gc.ca/
2121 Trans-Canada N. Suite 228 Téléphone/Phone: 514-421-4729
Dorval, Québec Fax: 514-421-4679
CANADA H9P 1J3 courriel/email: [EMAIL PROTECTED]
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