Ocean Modeling Discussion

ok. i see your earlier post on the coawst forum. I see that you are running ROMS with WEC on, but you are not coupled to a wave model. You must be reading in a netcdf forcing file with the wave info? I have not run that type of application in a long time. The waves are difficult to prescribe in a ...

What version of ROMS are you using? You can compare the logic of LBC allocation value in the latest https://github.com/myroms/roms develop branch.

My ROMS version is 3.9. Thanks for your advice. I'll take a check.

Dear ROMS Experts, I apologize for reaching out with multiple requests for assistance in a short period. However, I am troubled by an elusive error that I cannot comprehend, nor can I ascertain the conditions under which it occurs. While defining the WEC-related switches in my ROMS application, I ...

I don't think the difference between Pwave_top and Pwave_bot is the biggest issue. For SSW_BBL, if I recall correctly, you can either define SSW_CALC_UB (which needs Pwave_bot) or not define it and provide Uwave_rms, which is the root-mean-square value (in m/s) of the orbital motion near the bottom ...

Just to confirm: you are using COAWST (e.g., https://github.com/DOI-USGS/COAWST) or ROMS (https://github.com/myroms)? Thanks to your reply! I'm using COAWST to conduct this running instead of ROMS, cuz VF approach is just implemented in COAWST. It's probably easier to make a SWAN domain based on ...

Progress has been made in my running. Upon reevaluating the forcing files, I identified issues with my "Lwave" variable. Consequently, I performed iterative calculations of Lwave using the dispersion relation, employing the wave period at the spectral peak, which is publicly available data from ...

Dear ROMS Experts, I am currently utilizing ROMS to simulate changes in water levels during the passage of a typhoon. In this simulation, I am using wave variable inputs as a forcing file rather than coupled with SWAN. My main purpose is to investigate the impact of wave-enhanced bottom stress on ...

Hello, guys. It has been a long time since I raised the question last time. I am sorry for not giving timely feedback on the follow-up operation. Now I have basically run through the results of the two-way nested run with waves, and nudge only at the boundaries of the model domain, without sponge ...

Hey guys, I've got a new problem. now I would like to try to run ROMS by adding wave data to my forcing.nc to see wave effects on current. To do this, I defined CPP: #define WEC_VF #define WDISS_THORGUZA and I added wec boundary condition to .in file: ! Wec boundary conditions LBC(isU2Sd) == Shc Shc ...

Thanks for your reply arango! Yes, as you said, the vertical velocity is calculated from the three-dimensional continuity equation by the horizontal divergence. The water mass mismatch between the model and the data should be the main reason for the abnormally high omega values in the deep water ...

I recently went over my bdy and clm.nc and unfortunately they all seem to be in order, especially at the eastern and southern boundary. I don't know if I'm reading this wrong, but the presence of such a large vertical velocity at the near bottom of the southern boundary is really puzzling to me. I ...

Thank you wenpu. Very nice suggestion. I will try these suggestions slowly. If these makes my running better, I will show it.

Thanks for your reply wilkin. I'll look into it.

The latest running were successfully completed, and it seems that expanding the nudging area and increasing the drag coefficient can help. But I still have a few questions: 1. in my .in file, my timestamp is set as follows: ! Time-stamp assigned for model initialization, reference time ! origin for ...

I took further steps to improve my run. 1. I tried to add the nud.nc to improve my boundary conditions, although I don't know if it's really a problem. I set outer = 1/5, inner = 1/60, and width = 8 by using d_nudgcoef.m to generate a nudge file with linearly reduced nudgcoef from the boundary to ...

Dear ROMS users: I'm back. In my previous post: https://www.myroms.org/forum/viewtopic.php?p=25370#p25370 , the problem may not have been described clearly. I have made a lot of attempts during this period, and I would like to describe my running process in more detail. There may be other users who ...

No,I didn't nudge to 3D climatology. But I think I used RadNud boundary condition and make TNUDG=360, OBCFAC=120 to nudge boundary. Maybe someting wrong?

Dear ROMS user: I'm now running a realistic case in a coastal area with baroclinic time step of 180s and a grid resolution of 3km. During the first run, it looked like there was some strange mixing in the temperature field, so I try to take Kate's advice in the pervious post: https://www.myroms.org ...

Thanks for your reply Warner

I have posted the issue to https://github.com/DOI-USGS/COAWST/issues for further suggestions.

Dear Users: I seem to have a very simple compilation problem, but I'm sorry I don't know how to fix it. I have a working directory COAWST_master/ in my remote machine with a coawst.bash file, and I need to compile in that working directory to generate the corresponding coawst.M. However, I ...

Thank you for your detailed answer Dr.John. I think I know what to do next.

thank you jcw for rapid reply :D 1. I did find some abrupt u and v values in some of the clm.nc I generated when I re-examined them, but I don't know how these interpolation errors happened. One annoying problem here: when I use roms_master_climatology_coawst_mw.m to generate ini and bdy files, it ...

I'm sorry I didn't describe my problem clearly in my last post: https://www.myroms.org/forum/viewtopic.php?t=6491 . Now I would like to ask some of my recent doubts to yours roms experts: 1. I used roms_master_climatology_coawst_mw.m to generate ini, clm and bdy files for one and a half months ...

Halo everyone, I want to include wave files from Copernicus Marine Service directly in my ROMS simulation instead of performing the ROMS+SWAN coupling in COAWST. When I checked out my roms.in for some clue, I found the following parameters in the roms.in file: ! Constants used in surface turbulent ...

Thank you very much for your valuable advice! I'll give it a try right now.

Thank you jcwarner for your answer. i used ncview to check my rst file,found that abnormal salinity existed at the southeast corner of my study area.i wonder why sal value particularly low in this place,without I/O related problem? Is it the boundary conditions that cause it? https://i.postimg.cc ...

Hey, guys, I'm back. I reduced the size of the model domain and time step, and enabled ANA_NUDGCOEF in my.h file with the goal of nudging just at the boundary. When i rerun coawstM, fortunately it finally began to run, but after a couple of baroclinic time step, error happened: DIAG speed trouble 24 ...

It seemed like a problem I hadn't noticed before. I will try to adjust my model domain size and time step to start over.I really appreciate u taking time to explain everything to me!

Thanks for your provided information! Now I've known the reason of the occuried ERROR:EminusP does not exist in my forcing file.To simplify my case, I decided to first use ana_stflux instead of the actual surface freshwater flux. Now I've made some changes to my.h file and recompiled it: #define ...

The problem you have mentioned seems like a key point.Actually , I use /COAWST/Tools/mfiles/mtools/create_roms_forcings.m to generate my roms_forcing Netcdf file, but it doesn't seem to have variable "EminusP". I wonder what variables are necessary for forcing files to be entered into the ROMS? Is ...

Hi everyone， I have no idea about the ERROR below while I was running ROMS in my rootdir /COAWST_master: Found Error: 02 Line: 55 Source: ROMS/Utility/close_io.F, close_inp.F ROMS/TOMS - Output NetCDF summary for Grid 01: Found Error: 02 Line: 437 Source: ROMS/Utility/close_io.F, close_out ROMS/TOMS ...