Ocean Modeling Discussion

AMIRHOSSEIN

Hi everybody, I'm running 1-year model, About 4 months after running my model, the electricity was cut off and I could not launch perfect-restart in the model because I do not know how to change the header and input settings. Although some information is in the input and forum about how to restart ...

AMIRHOSSEIN

Hi lushilima,

The reason it took so long to answer was that I had just found my way.
please check these two links and if you had any questions ask me.

viewtopic.php?t=5998
viewtopic.php?t=6019

Best,

AMIRHOSSEIN

AMIRHOSSEIN

Hi everybody,
As jcwarner said, it was for the Era data, and it was because of the pressure that displayed 100 times larger in the ROMS output.

thanks a lot

AMIRHOSSEIN

Hello reba1, I had the same problem and I suggest that instead of downloading the src of ROMS from different places, download the latest version of ROMS through the following instructured link by having the username and password of the myroms.org site. https://www.myroms.org/wiki/ROMS_UNSW2008 -Good ...

AMIRHOSSEIN

Thanks, dear jcwarner and Kosa for your tips. I'll do them and inform the results.

AMIRHOSSEIN

Hi jcwarner, As you said, I also defined CURVGRID and here is the result: 18284 2013-01-03 02:47:20.00 2.468579E-02 1.246003E+04 1.246006E+04 2.406199E+14 (020,283,10) 3.895822E-03 1.595643E-02 7.901521E-02 8.782318E+00 18285 2013-01-03 02:47:30.00 2.469043E-02 1.246003E+04 1.246006E+04 2.406198E+14 ...

AMIRHOSSEIN

do you have #define CURVGRID that might help with some of the advection. take a look at the winds in that ncviewer. how strong are they on the west side? -j thank you for your reply jcwarner, As you said for defining CURVGRID in the header file, the angle in my grid is zero, and is it still ...

AMIRHOSSEIN

think you are changing too many things here. ERA winds should not affect the tides. and dont rely on ncview to give you the max/min. click at a point and get a time series. try this: You have this: Variable Grid West Edge South Edge East Edge North Edge ...

AMIRHOSSEIN

Thanks for your reply jcwarner,
Regarding your last sentence about salinity and temperature, do you mean that I should take salinity and temperature data
from databases such as Hycom or something else and enter it in the model as an input file?

AMIRHOSSEIN

Hi jcwarner, I am very thankful you are considering my problem. I apologize for being late. Something was wrong with my laptop. The problem with zeta is that after 11 days its amounts are very small. Before running the model in 3D, I ran it in 2D for 30 days and zeta changes were between 2 to 2.3 ...

AMIRHOSSEIN

Hi kate,
thanks for your instant response. As you said, I changed the boundary conditions, but nothing changed.
I am waiting for your guidance.

kate.log: my log file; (1.53 MiB) Downloaded 470 times

thanks

AMIRHOSSEIN

I had a question about boundary conditions and according to the topic I asked earlier in the forum (ERA5_wind_problem): https://www.myroms.org/forum/viewtopic.php?t=5998 According to wilkin's tips, I realized that I would get better results if I used the Rad mode and also changed the visc value. But ...

AMIRHOSSEIN

very well. Thanks for your instant response, wilkin.

AMIRHOSSEIN

Hi Wilkin, As you said, I use Rad for u and v, and RadNud for the free surface(but my nudging time scale is zero). Although the boundary file is read, it does not affect anything inside the domain. It is as if the edge of the border is stuck(It is visible in 2D mode) and does not allow it to be ...

AMIRHOSSEIN

Thank you jcwarner.

AMIRHOSSEIN

Hi everybody, I have a basic question about boundary conditions and did not find the answer in this forum. Why when we use Cha for free-surface and Rad for momentum in 2D and 3D mode, the boundary file is not read, but when we use RadNud for free-surface or Fla mode for momentum in 2D mode, the ...

AMIRHOSSEIN

Hi xrhuang, You can read these 3 papers: 1. Capet, X., McWilliams, J. C., Molemaker, M. J., & Shchepetkin, A. F. (2008). Mesoscale to submesoscale transition in the California Current System. Part I: Flow structure, eddy flux, and observational tests. Journal of physical oceanography, 38(1), 29-43 ...

AMIRHOSSEIN

Dear wilkin, Thank you for sharing your experiences. As you said, I changed the settings, except that I have not yet set the salinity and temperature to the boundary. When I increased the visc2, I still did not see any noticeable changes and there are still MaxDensity and MaxSpeed errors in the ...

AMIRHOSSEIN

Hi sankarea and dear johnluick,
Thanks for your tips.
Dear johnluick, you opened my eyes to this issue. Finally, with a lot of trial and error, I came to your valuable statements.

AMIRHOSSEIN

Hi dear wilkin, Did you mean to change the temperature and salinity data so that they should not be zero? I assume that salinity and temperature are closed in the new implementation and I did not provide any data for them. I also corrected the open boundary condition but got the same error again ...

AMIRHOSSEIN

Hi bilge.tutak and dear wilkin,

Thank you very much for your valuable guidance. I will check them, and I will announce the result.

AMIRHOSSEIN

Hi The tide performed well in the model and the zeta parameter fluctuated well. But I have a new problem, which is that when I add wind files to the model and run the model, I encounter errors such as max speed or max density. However, by making the time step smaller, I get the same error and the ...

AMIRHOSSEIN

Hi johnluick,
I didn't find a way to calibrate the zeta parameters and the bottom drag didn't help me too. what was your idea as you said about this problem?
thanks

AMIRHOSSEIN

Hi Arango, thank you very much for your reply. Maybe I asked my questions too general and could not make my point. I do not have any forcing file at the moment and only zeta values are given to the model via TMD in the boundary file. Now that I have been running the model for 30 days but the zeta ...

AMIRHOSSEIN

Hi everybody, I have a problem that I have not received an answer from anyone for a long time. I want to know what factors affect the zeta parameter? The next problem is that every time I change the input and header file, the zeta value does not change significantly and I want to know the reason ...

AMIRHOSSEIN

Hi, 1)I have max speed blowup even though I change the boundary condition to something else! 2)Is there a problem with my boundary condition or anything else? 3)what should I do with the time step because when I use a shorter time step, I face max speed error again?! 4)How can I calibrate the zeta ...

AMIRHOSSEIN

Hi,
I want to build a new boundary from a generated grid and I don't know how to use c_boundary.m(from Matlab files in myroms)!?
I'm a little new to Matlab and I'm very thankful if anybody could tell me how can I generate a boundary.
here is my grid:

AMIRHOSSEIN

Dear johnluick,
Thank you for your excellent guidance, I'll have a try.

AMIRHOSSEIN

kate wrote: ↑Tue Jul 20, 2021 6:43 pm Another option for fussing is the bottom drag. You can make a spatially variable bottom drag and modify it to get a better match.

thanks a lot, kate
I'll check it.

AMIRHOSSEIN

Hello everybody, I want to calibrate the tide and the domain is in the Persian Gulf I've used many lateral condition parameters but none of them help me to calibrate the model as I want(the result of Fla is too large as you can see in the picture below and when I use NudRad, the fluctuation vary by ...

AMIRHOSSEIN

Hi,
I used romstools for creating grid and tide and run the model

finally, I checked the zeta parameter in .his file but the results of the zeta were not in the desired range(should be somehow -1.5<zeta<+1.5 near the shore)

how can I prepare the zeta parameter?

: Capture.JPG (38.01 KiB) Viewed 2107 times

thanks

AMIRHOSSEIN

Hi dear Wilkin, I checked record 3 of the history file and as you said the problem was in the bathymetry then I used romstools for creating grid and tide and run the model and the model run correctly finally, I checked the zeta parameter in .his file but the Results of zeta were not in the desired ...

AMIRHOSSEIN

Hi everybody my grid file has 30 vertical layers, but by changing the boundary and time, I could not prevent the model error(in 30 vertical layers), but considering 16 layers (the grid file is the same 30), the model was executed correctly for a year and I do not know where the problem comes from ...

AMIRHOSSEIN

I face this error when I use a shorter time step with 30 vertical levels: -------------------------------------------------------------------------------- Model Input Parameters: ROMS/TOMS version 3.9 Saturday - May 15, 2021 - 1:30:09 AM ...

AMIRHOSSEIN

Hi kate,
thanks a lot for your response

I'll do it and announce the result.

AMIRHOSSEIN

Hi, The first question, which is a bit basic, what are the priorities for checking the output in .log file? The second question is that the grid file has 30 vertical layers, but by changing the boundary and time, I could not prevent the model error(in 30 vertical layers), but considering 16 layers ...

AMIRHOSSEIN

Thank you kate
I'll check it and try to solve the error

AMIRHOSSEIN

thank you very much kate finally, I did it by editing the varinfo.dat and a header script for lwrad error but now, I face another problem: ......................... Blowing-up: Saving latest model state into RESTART file REASON: KEchar = NaN, PEchar = NaN ......................... where do KEchar ...

AMIRHOSSEIN

What does "ncdump -h era5_msdwswrf_year_2013_roms.nc" look like? Is there a time variable? What is it called? ...................................... dimensions: lon = 89 ; lat = 49 ; swrad_time = UNLIMITED ; // (744 currently) variables: double lon(lon) ; lon:_FillValue = 1.e+35 ; lon:long_name ...

AMIRHOSSEIN

Hi, Using the pre-made Python code(below), I downloaded the Era5 data and converted it to ROMS input ERA5-ROMS-master.zip When the model wants to read the data, I get the following error: ........................................................ NETCDF_GET_TIME_1D - error while inquiring ID for ...

AMIRHOSSEIN

Hello kate,

I'll check what you said

thanks for your response.

AMIRHOSSEIN

Is there anybody can help me?

thanks

AMIRHOSSEIN

Hello everybody, I have a little basic question Suppose there is petrochemical contamination, then how many scenarios can be considered for the discharge of pollution to the sea? How should we know at what sea level the discharge should take place? (Should the discharge be a point or wide? or Is it ...

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