Water levels input fields not correctly recognized in log.ww3?

[sbahamondezp]

Dear Community
I am writing because I have a problem regarding the incorporation of water level information into WW3.
I am attaching ww3_prnc_lev.inp and ww3_prnc_lev.log, where it can be seen that the preprocessing for the water level finishes correctly, reading the corresponding date.
However, in the log.ww3 file I get:
...
Initial time : 2010/01/01 00:00:00 UTC
Water level time : date and time not set.

...

That is, there is no "F" in the reading of the first water level field, and in the following time steps there is a "U", but it appears at time steps that do not correspond to the sampling time.
As can be seen in ww3_prnc_lev.log the fields are every 3 hours. In addition, the current velocity components are being updated every 3 hours and they have the same time vector as the water level.

So, my questions are the following:

1. Why does Water level time : date and time not set appear?
2. What does the letter "I" mean in the first field reading?
3. What does the letter "U" mean, and why could it be out of phase in the log.ww3 output?

On the other hand, the attached ww3_shel.log shows that the inputs are indeed being updated every 3 hours. Furthermore, in ww3.201001.nc output I do have sea level fields (WLV).
So, how could I make sure that the model is actually reading the sea level correctly?

Any guidance would be greatly appreciated.

Best regards,
Sergio
https://github.com/sbahamondezp/WW3_files.git
ww3_prnc_lev.log
ww3_shel.log
ww3_prnc_cur.log

[mickaelaccensi]

Dear Sergio,

It's a pretty good question. I'll try to answer the best I can. Ice and water levels inputs are updated at mid-time step to update the wavenumber grid without modifying the spectrum. This is different to updating the forcing fields as wind and current which are updated at the provided time step.

So, for forcing fields, you'll see a 'X' in the log file whereas you'll see a 'I' (for initialization) or a 'U' (for update) or a 'L' (for last) for ice and water level because they directly affect the spatial grid and wavenumber grid.

I hope it helps.

Please, also read the WW3 manual at section 3.2 and 3.3
https://data-ww3.ifremer.fr/TRAINING/DOC/manual_WW3.pdf

Best regards,

Mickael

[sbahamondezp]

Thank you very much for your reply.
Your explanation and the manual made it clear to me how sea level updates are carried out.
Best regards,
Sergio