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hello

I try to modelise a sendiment transport near the coast of Dunkerque.To do that I created a tide under telemac and a wave propagation under tomawac.Under tomawac I put an initial free surface at 9.32m corresponding to a high tide level with a surrelevation (due to a storm). this is a constant free surface. Under telemac I generated a tide where the free surface go from 0m to +7m. My problem is I don't know how sysiphe react with the differences of my free surface configuration. My aim is to have 9.32m at high tide and 2.32m at low tide but if possible, I would like not to relaunch a propagation simulation. How should I configure telemac to do what I want? I hope what I say is comprehensible.

thank you for your help !
best regards

Hello,

I would strongly recommend that you use Telemac-2D and Sisyphe in a dynamic step by step coupling (keywords COUPLING WITH : SISYPHE, etc.), see e.g. 02.susp_analyt in sisyphe test cases.

Tomawac will be dynamically coupled with Telemac-2D in version 6.1 but in version 6.0 it is only chaining, with a results file of Tomawac given to Telemac-2D and the last record taken (thus no evolution in time).

With best regards,

Jean-Michel Hervouet

hello

Thank you for your help !!
I will try this, but if I give the result file of tomawac (free surface at 9.32m), will it add the free surface of tomawac with the free surface of tide that I created with telemac2d ?

thanks a lot !!

Hello,

For the chaining with Tomawac, only the driving forces are taken, not the hydrodynamic variables, so the free surface will be just discarded.

Regards,

JMH

hello

thank you very much for your answer !

I have two other question concerning the chaining :

-if I create a tide under telemac, and I run it for two tides (about 24 hours), does sisyphe repeat this tide during all the time of simulation? or have to run the two simulation for the same time?

-isn't it better to do the chaining with Tomawac under sisyphe intead of telemac2d? (for the sediment transport)

thank you very much for your help, it helps me a lot

best regards

Hello,

Yes in chaining you may repeat a number of times the tide or flood in the hydrodynamic file. In coupling it will just run at the same time, hence 24 hours in your case.

For chaining with Tomawac the stress terms for Telemac-2D and the terms for Sisyphe are not the same. I am not sure whether the two effects must be added or not. I'll ask.

With best regards,

Jean-Michel

Here are more accurate answers to your questions:

-if I create a tide under telemac, and I run it for two tides (about 24 hours), does sisyphe repeat this tide during all the time of simulation? or have to run the two simulation for the same time? => this is is explained in the user manual : p 7 and 8. When the flow is steady (‘steady case’ = yes), only the last record will be used. Otherwise (‘steady case’ = NO),the ‘Tide Period’ and ‘Number of tides or floods’ will be used to specify the sequence to be read on the hydrodynamic files. Hydrodynamic records are interpolated at each time step of the sedimentological computation.
Note: an error may occur when the ‘Tidal Period’ is not a multiple of the graphical time steps of the hydrodynamic file (‘Hydrodynamic file is not long enough’).
In an unsteady case, the keyword ‘Starting time of the hydrogram' gives the first time step to be read. If the starting time is not specified, the last period of the hydrogram will be used for sedimentological computation.
So in your test case you should use:
steady case’ = NO
Tide Period =
Number of tides= 2
the tide will be repeated twice ...

-isn't it better to do the chaining with Tomawac under sisyphe intead of telemac2d? (for the sediment transport)=> Source terms for coupling are between Tomawac and Telemac. If you want to calculate the effect of combined waves and currents you have to specify the wave parameters in either the hydrodynamic file or the wave file. There is a whole chapter on this Topic in the user manual for Sisyphe.
The ‘HYDRODYNAMIC FILE’ can contain all the wave parameters (which is recommended for the non-steady case). The waves can also be specified from an independent wave field. The ‘wave file’ gives the name of a previous wave (TOMAWAC) results file. Only the last record will be read.
Use keyword: ‘WAVE FILE’, ‘WAVE EFFECTS’...

thanks a lot for your answer !

I will try this, it seems very clear know.

best regards !!

Hello !

I tried to compil sisyphe and telemac2d like you explained, but it didn't work. The boundary file was not read (see below) and I don't know why.

Thank you in advance for your precious help !


C:\telemac\V6P0\telemac2d\tel2d_v6p0\win\telemac2dv6p0.exe
_________________________________________________________________
*** ACQUISITION DES FICHIERS ***

- FICHIER DES PARAMETRES : couranto_param

- DICTIONNAIRE : telemac2dv6p0.dico

- FICHIER DE GEOMETRIE : Copiedetest

- FICHIER DES CONDITIONS AUX LIMITES : couranto_param.conlim

- FICHIER DES FRONTIERES LIQUIDES : couranto_param.liq

- FICHIER DE GEOMETRIE : Copiedetest

- FICHIER DES CONDITIONS AUX LIMITES : cas_sis_houl.conlim

ERREUR A L'ACQUISITION DU FICHIER cas_sis_houl.conlim
________________________________________________________
Execution terminee: telemac2d.bat
________________________________________________________
No compilation/linking/file errors detected.
No execution errors detected.
Returning exit status 0

=========================================================
Telemac System Freeware 6.0 - Perl scripts version V6.0
=========================================================
...stopping.

Hi

it's strange. You've got 2 boundary file?
Maybe a problem in your parameter file...