open TELEMAC-MASCARET The mathematically superior suite of solvers

Could anyone told me how to use the parameters such as COEFFICIENT TO CALIBRATE TIDAL RANGE, COEFFICIENT TO CALIBRATE TIDAL VELOCITIES, COEFFICIENT TO CALIBRATE SEA LEVEL. I have been success in using TPXO database in boundary condition. But I found the water level in the domain is not correct. I suspect that the three parameters need to be tuned. However, there is no detailed explanation in users' manual. Could anyone give me detail information of the parameters?

Hi,

These parameters allow some control over the generated tidal boundary, however, they act globally on all tidal constituents. The manual has quite a good explanation for each of the keywords, but to reiterate, they basically do the following:

• COEFFICIENT TO CALIBRATE TIDAL RANGE: Adjusts the amplitude of the tidal water levels. Values above 1 increase the amplitude and below 1 decrease the amplitude. For example, 1.1 is a 10% increase in the water level
• COEFFICIENT TO CALIBRATE TIDAL VELOCITIES: Acts in a similar manner to that of COEFFICIENT TO CALIBRATE TIDAL RANGE but applied to the velocities instead. If the tidal amplitudes are adjusted, then by default boundary velocities are also adjusted by a factor equivalent to the square root of the tidal amplitude factor
• COEFFICIENT TO CALIBRATE SEA LEVEL: Value is the offset applied to MSL at the boundary. By default MSL is assumed to be zero with TPXO boundaries (i.e. coefficient = 0).

I suggest to run some test cases and alter each of these, checking the water levels and velocities at the boundaries to observer their relative influence.

Regards,
Toby

Thanks. I will have a try

Hello Dear all,
I downloaded the files hf.tpxo8_atlas_30 and uv.tpxo8_atlas_30 for a simulation taking into account the TPXO database at the downstream boundary of my study area. I made a first successful attempt with the case t2d_tide-ES_real.cas found in the examples in the telemac2d installation folder.
But the simulation fails from the beginning of the first time step when I try on my own case study. Can you please help me understand what is wrong please ?

Best regards,
Marleine

Hello Marleine,

Perhaps if you provide your steering file, potential Fortran files and the listing file containing the error, it can help. Hard to say more at the moment.

Chi-Tuan

Hi Chi-Tuan,
Thank you for your answer.

I have tried three couple of files : uv.tpxo8_atlas_30 and hf.tpxo8_atlas_30, u_tpxo9.v5a and h_tpxo9.v5a, uv.AO_2008.out and hf.AO_2008.out. All of them failled with the same error.
On the fortran file I just changed the value of "FIRST" and "LAST" according to my boundaries' file.
The liq file contains the discharge cuve for the two boundaries upstream. And it seems to be not enough regarding the error in the log files. When I add a SL column in this liq file, the log file indicate that velocity is missed. But I expected to have the hight and the velocity automaticaly provided from the files of the database I use.

I am using TPXO (which looks easier to use) as first try of tide database as recommanded in a post some years ago (www.opentelemac.org/index.php/kunena/scr...de-coordinates#35651). But my aim is to use FES2014 database since it has been validated on my study area previously. I download the folder needed but I do not realy know how to extract the harmonics constants. Is there a package to use in matlab or python or other to do the extraction ? There is a FES "softward" too, but I still do not get how it works.

I am looking forward to your answer.

Best regards,
Marleine

Hello Marleine,

Please upload your listing file by changing it with an allowed extension, such as .txt. .log is not allowed and the file cannot be read.

You can try to add the 3 keywords PRESCRIBED ELEVATIONS, PRESCRIBED FLOWRATES and PRESCRIBED VELOCITIES even with dummy values as changed by tidal BC and LIQUID BOUNDARIES FILE.

If you want to use FES, read the following post:
opentelemac.org/index.php/kunena/16-tele...model?start=10#43032
Perhaps other users can provide you matlab or Python scripts.

Hope this helps,

Chi-Tuan

Thank you for your quick answer.
Here is the file.
The simulation have started without error with the three key words set as you suggested. I hope the result will be realistic.
Thanks a lot.

Regards,
Marleine