open TELEMAC-MASCARET The mathematically superior suite of solvers

This topic may seem a little naive, but I did not find the answer to my questions in the TELEMAC-2D or TOMAWAC manuals. I have long experience with hydrodynamic "tidal" models, but I have no experience at all with wind wave models such as TELEMAC, and I would like to understand how the two-way coupling works.

As far as I understand, TELEMAC-2D computes water levels and depth-averaged velocities and transmits them to TOMAWAC. Then TOMAWAC computes wind wave parameters, and deduces the driving force components (FX and FY) from them. In the next time step, FX and FY are used in TELEMAC-2D to take the influence of wind waves into account.

I have two questions:

1) How are the driving force components FX and FY computed from the wind wave parameters?
2) In TELEMAC-2D, are they replacing the traditional wind stress, or both are used together?

Thank you for your help.

Up?

Hello Olivier,

When you couple TOMAWAC with TELEMAC-2D, TOMAWAC generates FX and FY from the radiation stresses, which are then added as an extra source of momentum to the TELEMAC-2D simulation via the subroutine prosou.f. (It is adding to the wind stress, not replacing it.) The radiation stresses computed by TOMAWAC are a function of the wave field (which could be generated locally by wind or propagated from outside).

Hope this helps,

Pat