open TELEMAC-MASCARET The mathematically superior suite of solvers

Hi,

I am aware of Telemac's inbuilt PTM, however openTracker has many useful features. Have you had success with the openDrift Telemac Selafin reader?

cheers
Ed

Didn't tried as I never use openDrift but what I mean is this is probably not a problem with the selafin reader itself but maybe more in the way it is used in openDrift...

Hi Ed,

I don't think I have mentioned it before in this thread:
Please have a look at the Selafin Xarray package pypi.org/project/xarray-selafin/

you might be able to workaround your problem by loading your Selafin through xarray.

Then just use the traditional xarray functions like docs.xarray.dev/en/latest/generated/xarray.Dataset.rename.html
to make your data compliant with the openDrift format

Cheers

Hi Tom,

Hope you are well..


I have been having some troubles with resolving accurate wind-driven currents in Telemac3D. As I know you after use Telemac with atmospheric forcing, do you have any configuration recommendations (i.e. solvers, etc).

cheers,
Ed

Dear Sir,

You mentioned that the binary file (SLF for wind and Patm) variables should be named as follows:

WIND VELOCITY U
WIND VELOCITY V
SURFACE PRESSURE
AIR TEMPERATURE

However, in the nomvar_telemac2d.f file, I see the following definitions:

TEXTE (16) = 'WIND ALONG X M/S '
TEXTE (17) = 'WIND ALONG Y M/S '
TEXTE (18) = 'AIR PRESSURE PASCAL '

Does this mean that the subroutine hasn't been updated yet?

Also, could you provide guidance on how to interpolate u10, v10, and patm at the time AT, considering that the timestep in the binary file (10 minutes) and the timestep in the cas file (10 seconds) do not match?

Thank you for your help!

Best regards,
Mourad

Hi Mourad,

Actually

WIND VELOCITY U
WIND VELOCITY V
SURFACE PRESSURE
AIR TEMPERATURE

is the old way of naming meteo variables (prior to v8p5 I think)

is the new way of naming them

andis their short spelling.

For the interpolation, just properly define the time stamps in your wind file, TELEMAC will do rest for the interpolation if the time step of your simulation is between your wind file time steps.

I have a few global examples with wind input files here:
drive.google.com/drive/folders/18nHcPTj4...dk6h_?usp=drive_link

Feel free to check it.

Hope it helps

Hi Tosmail.
Really! If everything is well defined in the selafin file and whatever the timestep in it greater (or not)than that from cas file telemac2d does
interpolate meteorological variables by itself whitout telling him how.?

Dear Mourad

I've faced such a similar problem, The quickest solution is to manually impose the data you have on the .slf output from the meteo converter script; and the Telemac meteo subroutine shall know how to interpolate accordingly.

I hope I've understood you correctly and this may've helped in any way.

I'm free to share the my case via this email: This email address is being protected from spambots. You need JavaScript enabled to view it.

Yours sincerely,
Ahmed

Dear Tosmail,
I did it as you suggested, but the result is that TELEMAC2D does not interpolate between two timestamps if the timestep in the CAS file differs from the timestep used in the binary file. We need to tell TELEMAC2D how to find T1 and T2 that bracket AT and interpolate the wind components and atmospheric pressure onto the mesh
Regards
Mourad

Hi

Except maybe if you use an old version, I confirm the post of Tomsail.
There is an interpolation in time done in the binary file read.