open TELEMAC-MASCARET The mathematically superior suite of solvers

Hi,

I have just coupled Telemac3D with Tomawac. The modelled waves match well against two wave buoy station data. However, the resulting current fields show a great irregularity not just on the surface but also at depth deeper than 100 m (please see attached pictures). Has anyone come across this before?

I am trying to conduct a wave-current-sediment transport study and am mainly interested in the effect of the current on the wave and sediment transport. Can I simply just modify the code such that the currents will not be updated after calling TOMAWAC?

Edwin

Hello,

I first want to inform you that the coupling between TOMAWAC and TELEMAC3D is actually a 2D coupling : the wave driving forces FX and FY acting on the current are uniformly imposed over the water depth. This is why you found that currents are affected even at depth deeper than 100 m.

We are actually working on the improvement of this coupling (a PhD student works on improving this method) but it won't be available before at least 6 months or one year.

Nevertheless, I am a little bit surprised about your currents at the surface... How big are the waves in your domain? What are their main direction of propagation?

I think you can try to modify the code such as the currents will not be updated after calling TOMAWAC, but then you won't have any current created by waves. Are you sure this won't be a problem for your results? The sediment transport can be highly affected by these currents near the shore.

Regards,

Elodie

Hi Elodie,

Thanks for the response. The largest wave that I have in the model at that snapshot is about 0.5 m. A possible reason with the surface current may be because I am prescribing water surface elevation on both ends of model boundary and only managed to get it to work by using Thomson boundary condition. So the disturbance to the current by the wave could have resulted in confused flow region by the boundary.

Thanks for the advice. I will try to see if I can update current created by waves in the nearshore region only (say depth < 5 m) and see how the model results look like.

Edwin