# Ocean Modeling Discussion

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 Post subject: High water speed values in hisfilePosted: Fri Dec 14, 2018 6:33 pm

Joined: Tue Aug 04, 2015 4:42 pm
Posts: 48
Location: Universidad del Mar (UMAR), Mexico
Hi everybody:
My model blown up at 55 days, apparently the cause is near the coast...
the history file has very high water speed values (example 5x10^36).

Attachment:

wind.png [ 201.75 KiB | Viewed 460 times ]

This is a part of the matrix, where you can appreciate the extreme velocity values near the coast
Attachment:

Screenshot-1.png [ 197.95 KiB | Viewed 460 times ]

Does anyone have any suggestions, how to correct this?

Mar.Mo.

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 Post subject: Re: High water speed values in hisfilePosted: Sat Dec 15, 2018 8:30 pm

Joined: Wed Dec 31, 2003 6:16 pm
Posts: 778
Location: USGS, USA
how about looking at some forcing variables near those locations. what does sustr svstr zeta rho look like?? something is making the water move.
-j

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 Post subject: Re: High water speed values in hisfilePosted: Tue Dec 18, 2018 10:47 pm

Joined: Tue Aug 04, 2015 4:42 pm
Posts: 48
Location: Universidad del Mar (UMAR), Mexico
Hi John!
I don't have problem with zeta, rho, temp, salt, etc... but sustr, svstr, u and v have values of the order 5-7e+36. Is possible that this was a mask problem?
Is this would cause that the model blow-up? Taking into consideration the following:
Quote:
"At the end of every time step, the values of many variables within the masked region are set to zero
by multiplying by the mask for either the u, v or ρ points"

I also attachment the logfile
Attachment:
out_hmin10_Nclose.txt [24.18 MiB]

Scarlett

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 Post subject: Re: High water speed values in hisfilePosted: Wed Dec 19, 2018 1:22 pm

Joined: Wed Dec 31, 2003 6:16 pm
Posts: 778
Location: USGS, USA
the error at the end of the output log is

132000 0001-02-25 00:00:00.00 1.203129E-02 7.265249E+03 7.265261E+03 5.839635E+14
(075,001,15) 7.890818E-04 3.869123E-03 2.404095E-02 1.595520E+00

NETCDF_PUT_FVAR_1D - error while writing variable: ocean_time
in input file: /media/STORAGE/prueba_forc_build/ocean_his.nc
call from: wrt_his.F

I am not sure what this is really telling you. it might be a symptom of something else. Can you make sure the disk is not full or nothing else is strange for the ocean_his.nc file.

For the values of high stress and currents - if you ncview the his file, are those high coastal values there for a long time? it is strange the roms is not writing out a warning for those large values. How did you do the masking in the grid file?

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 Post subject: Re: High water speed values in hisfilePosted: Wed Dec 19, 2018 5:38 pm

Joined: Tue Aug 04, 2015 4:42 pm
Posts: 48
Location: Universidad del Mar (UMAR), Mexico
Dear John,
Quote:
Can you make sure the disk is not full or nothing else is strange for the ocean_his.nc file.

The disk has enough space to write, what other thing could be strange?
Quote:

For the values of high stress and currents - if you ncview the his file, are those high coastal values there for a long time?

There aren't values of high stress and currents, the 5-7e+36 value is the FillValue.

Quote:
How did you do the masking in the grid file?

Attachment:
roms_grid_ok_4s.nc [5.42 MiB]

Best regards.
Scarlett.

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