open TELEMAC-MASCARET The mathematically superior suite of solvers

Hello,

Is this the elevation of the surface layer from the 3D results? not the free surface from the 2D results?
On "both*.jpg" pictures, it seems there are slight differences between without and with wind effect during the second spring tide (second half of the run). Can you zoom in at a time when the wind is strong? also plot the wind? How are the currents?

Regards,
Laurent

hi,
these are the 3d results.
in the pic1 there is the zoom of the period when the wind is most strong. there is difference between the two simulations.
But i expected more diference ( in the order of magitude of ten centimeter)

The currents of superficial layer follow the directions of the wind with a little inertia and the velocities are good.

thank you

R

Hello,

You can also play with the "COEFFICIENT OF WIND INFLUENCE" to tune the model sticking more to your measurements, especially for the current speed.
For the sea level, atmospheric pressure also plays an important role, you can take it into account as inverse barometer for instance.

Regards,
Laurent

hi,
it's the thing that i did but when i reproduced the right elevation, the velocity associated it's totaly wrong.
i arrived untill a WIND COEFFICIENT in the order of magnitude of 10^-4.
I don't know how move.

Thanks

Best regards

Hi,
Wind setup is a function of fetch, water depth, wind speed and duration. What's the size of the water body (i.e., model domain) that you are dealing with?

Hi,
the yellow line it's 30 km!

thanks

Best regards
R

Here is what I suggest that you can do to see if your model is working properly or not.

- take your existing model domain and set uniform depth (say 20 m deep)
- apply uniform wind speed (say 20 m/s westerly wind).
- close boundary (2 2 2) and no tide effect.
- Simulate the model for 2-3 hours of simulation time.
- Compare the water level on the east end of the model (where you'd expect water to pile up) against values derived from standard wind setup equation

For fetch distance of 30 km, wind speed of 20 m/s and uniform depth of 20 m, the setup is about 12 cm. If the wind is reduced by half to 10 m/s, the setup reduces to less than 5 cm.

Hi,
I did the try with all the closed boundary and the results are good.
I don't understand why i can't replicate the set up in my harbour.
Whit a misure campain i found a set up of 40 cm with a wind from SW..
I shoud calibrate the model whit the velocity and not with the sea level?

Thanks

Best regards
R

Not sure what you meant by "Whit a misure campain". I assumed you meant the field measurement. How did you come up with the 'wind setup' from your measurement?

Hi,
I'm sorry, I wrote very bad, my mistake!

I mean 'measurement campaign' of free surface elevation,they are done with a ADCP inside the harbour!
The data of wind was recreated from a numerical model.

Best regards

R