open TELEMAC-MASCARET The mathematically superior suite of solvers

Hello,

I want to prescribe time varying inflows from tributaries within the model.
What I found in the dico file is "WATER DISCHARGE OF SOURCES" and related keywords.
The accompanying problem is that the tributaries have very steep slopes and so I want to initialize, (to have a hotstart file for the flood simulation), wetted elements till the outlet by prescribing discharge and water depth at the inflow (this works excellent when the inflow boundary is located at the model boundary).

Is there generally an option in Telemac-2D to have liquid boundaries inside the model or what is the best way to solve such tasks?

Thanks in advance for any advices!

Best regards,
Clemens

Hello,

It seems that sources would do the job, and you can have a positive discharge on dry land (I think... this is to check), it is not like a liquid boundary where we need to have the depths to find what velocities will give the correct discharge.

With best regards,

Jean-Michel Hervouet

Hello Jean-Michel,

thank you for the answer.
I will try and give some feedback how it works.

Best regards,
Clemens

Hello,

prescribing the inflow from tributaries within the model domain on initially dry areas via the sources works perfectly! I tried the procedure without prescribing velocities, so without a momentum flux. I'm astonished how well it works, so I'm wondering how this procedure works. How does Telemac-2D calculate the water depth and the velocities in the node with only prescribed discharge?

Best regards,
Clemens

Hello,

The discharge of sources is just a right-hand side in the continuity equation (hence a positive discharge will increase dh/dt and thus will increase h). If we add no momentum in the momentum equation it is equivalent to an assumption that the velocity at the sources is equal to the local velocity, and that's all...

Regards,

JMH