Ocean Modeling Discussion

zhaolv

I'm using roms for a month of simulations. But the model crashes just as it starts to run and I would like to know why this is. logs prompts me with: Maximum grid stiffness ratios. rx0 = 9.648683E-01 (Beckmann and Haidvogel) rx1 = 8.844612E+00 (Haney) Where did this go wrong? Is my simulation area ...

zhaolv

Hi! I was recently able to run the WRF-ROMS-SWAN coupled model successfully using COAWST. Now I would like to consider the effects of some wave-current interactions. What should I do if I wish to add the effects of whitecapping (WEC_WCAP?) to the model? Do I turn on these switches at the same time ...

zhaolv

In the roms 'his' file the seawater temperature, salinity etc. data is divided into 16 layers. I know that when the topography changes, the depth of seawater under the same layer is different. So I would like to know how to get the seawater temperature and salinity data for a point at a depth of 100 ...

zhaolv

I have set the initial boundary conditions of ROMS to N=16, so the seawater temperature, salinity etc. data in the his file is also divided into 16 layers. I know that the depth of seawater under the same water layer varies when the topography varies. So I would like to know how can I get the data ...

zhaolv

Here are the parameters I have set in wrf mode. I used the wrflowinp file generated by wrf for the start of wrf-roms mode. &time_control run_days = 0, run_hours = 96, run_minutes = 0, run_seconds = 0, start_year = 2018, 2018, start_month = 09, 09, start_day = 13, 13, start_hour = 00, 00, start ...

zhaolv

I have recently been using the wrf-roms coupling mode. When looking into to SST, it was found that the sea surface temperature obtained from the roms simulation does not basically change with time. That is, the sst does not produce a diurnal temperature difference. There is also little change in SST ...

zhaolv

I conducted simulations of typhoons near the South China Sea. I have also used wrf and wrf-roms models for comparison. However, I found that the path of the typhoon centre was more inaccurate in wrf-roms mode than in wrf mode. I would like to know how you have adjusted for similar situations. How ...

zhaolv

Thank you very much for your guidance, it has helped me a lot

zhaolv

I have recently been using the "roms_wilkin-master" toolkit. I would like to know how I should extract all the sea surface height data along the lon, lat paths.
So far I have found that the roms_genslice function can extract 4-D data along the path, but how should I get the zeta data?

zhaolv

looks like the simulation starts with zeta = -0.5 but the obs are at +0.5. so it will take a while for that barotropic mode to slosh out of the model. after 2 days the water levels look like they are starting to get into phase. if that storm at time 40 is your main interest, i suggest you start the ...

zhaolv

Hello! I am having a problem running the wrf, roms coupled mode. roms sea surface heights do not correspond to the measured tide level data. There is a difference of 6 hours between them and I would like to know why. How should I adjust it. The tide level file I am using is Create_roms_tides.m in ...

zhaolv

I'm sorry that I didn't explain myself clearly. I am using the method in coawst. Use the file "roms_master_climatology_coawst_mw.m". I have placed the file below.
Thank you for your guidance.

zhaolv

Does anyone know what the cause is, please?

zhaolv

HI！ I have a question now. Why some grid files have all zero data in clm and bdy files when creating initial and boundary files? Including u, v, temp, salt and other data. I am currently using the GridBuilder program to create the grid. However, I have found that the grid files generated using this p ...

zhaolv

I have been using coawst's program for the roms pre-processing process. The program used is the one in the tools file. But when I create the initial boundary file using the program Roms_master_climatology_coawst_mw, I find that the data set in the file is for GLBa. However I would like to use the ...

zhaolv

I don't know much about cpp options, but I tried turning off the BULK_FLUXES option and "define ANA_SMFLUX". I'm not sure if this is the right thing to do, but the result suggests that I need shflux data. The GFS data (including Uwind, Vwind, Pair, Tair, etc.) that I used when I "define BULK_FLUXES ...

zhaolv

Hello, I have currently been able to successfully run the roms model as well as the wrf-roms-swan coupling model via coawst. However I find that I have to use a forcing file with wind fields in my roms model. How should I change my .h file if I want roms not to be driven by the wind field and only ...

zhaolv

I have good news. Based on the master mesh file generated from the matlab file you provided, I created the initial boundary file. Afterwards I applied it to the coupled model of WRF-ROMS and the model can now be run successfully and the results are more than satisfactory! I have placed the results ...

zhaolv

ok i spent some time on this. I think the issue is a bathy mismatch between the child and the parent, especially near the boundary. At the location of that vortex, the child grid has a bathymetric rise, but the parent grid did not see it. So i recommend that you use average child bathy to replace ...

zhaolv

I looked at the grids and they seem ok. the bathy matches well. the dmde looks large in the parent grid. are you running with curvgrid on? also the parent has spherical ='T' and the child has spherical = 1. this is probably not an issue. how did you set the init conditions? are the T/S fields ...

zhaolv

looks like the only differences for roms is along the southern boundary. with nesting, does the vortex start and grow, is it formed during the experiment at the boundary and advect in? does the child bathy match the parent? i assume this probably gets deep along that child southern boundary. -j Yes ...

zhaolv

We recommended running without nesting, but still, you haven't reported that solution. Unfortunately, there is not much help that we can give you if the suggestions are not followed. I'm sorry I didn't take note of your suggestion before, but I recently re-ran the coupled model without nesting and ...

zhaolv

i am not worried about the free surface, if that is all dry anyway. do you have wet dry on? did you set hmin = 5 in both the parent and child? is this vortex created at the boundary and advected in? can you do me a favor, i made a change to my version of nesting.F, Are you using COAWST? if so ...

zhaolv

i am not worried about the free surface, if that is all dry anyway. do you have wet dry on? did you set hmin = 5 in both the parent and child? is this vortex created at the boundary and advected in? can you do me a favor, i made a change to my version of nesting.F, Are you using COAWST? if so ...

zhaolv

I think this person is using COAWST. And yes they should add SST to cover non-Roms areas, and they probably are. We have had this option since the beginning of the coupling. What we do is use the SST from the WRFlow file, and replace that with ROMS data wherever the ocean is. We do that for each ...

zhaolv

This is my grid situation, I noticed that the area where the vortex appears is at the junction of the grid, should I change the grid area? Here are my temperature and salinity fields. Although there are some areas that are rather strange, I don't think they should be the cause of the vortex ...

zhaolv

I have recently been using wrf-roms coupling to simulate a typhoon in the South China Sea. However, according to the roms output, the flow field is showing strange vortices in the southern part of the simulation area, this simulation is from 2018-09-15 to 17, the flow field diagram is below, when I ...

zhaolv

what is the bathy in that corner? i see you have 2 Vtransform S-coordinate transformation equation. 4 Vstretching S-coordinate stretching function. 5.0000E+00 theta_s S-coordinate surface control parameter. 4.0000E-01 theta_b S-coordinate bottom control parameter. 50.000 Tcline S-coordinate surface ...

zhaolv

I was running roms and found that the model crashed at the fourth hour and prompted me with excessive speed at a certain point, I checked the rst file and found that there was indeed an exception, how do I fix this? I have tried changing the model grid, the time step, but nothing has fixed the ...

zhaolv

How did you resolve the clm to 0? The data I extracted from GLBa0.08 is also 0

zhaolv

I also had this problem and could not extract the initial boundary field from HYCOM, how did you solve it?

zhaolv

hello I am using COAWST to couple WRF and ROMS, I have been able to run WRF and ROMS separately, after that I edit the coupling.in, scrrip_coawst file. but when I run it, I am prompted with an error in the roms.in file, missing NestLayers. But actually my roms.in file already includes the NestLayers ...

zhaolv

Dear all. I am trying to compile SCRIP_COAWST from the word document and I am using the gfortran compiler. But when I use make it doesn't create the .exe file, I don't know why, I did use netcdf4. Here is my out file Also, I used '--enable-netcdf-4' to see if ndtcdf4 was installed according to ...

zhaolv

I'm currently using wrf and roms coupling in coawst, but when using a tool I need wrfv3.6 version and roms coupling. Please how can I get the old version of coawst.

zhaolv

kate wrote: ↑Thu Nov 18, 2021 7:01 pm It is bad before taking the first timestep. I would look carefully at your initial conditions.

Thank you for your attention.

This is my bdy, clm and ini files, you can view them if you need them.
I have been studying this problem for a long time, please help me

zhaolv

1. I see your nothern zeta,vbar and ubar value are 0. 2. Your rx0 value of the nesting model is too high. 3. It is not possible reason for blowing up, but I was wondering setting the boundary condition of the northern area as gradient for tracers? Also western is set as a gradient instead of close ...

zhaolv

I am using coawst to study recently, but I got an error when I tried to run the roms model alone. I think there should be no problem with my initial file data. Maybe my ocean.in file parameters are wrong? GET_3DFLD - salinity climatology, 2018-09-16 00:00:00.00 (Grid=02, Rec=2, Index=2, File ...

zhaolv

I am using coawst to study recently, but I got an error when I tried to run the roms model alone. I think there should be no problem with my initial file data. Maybe my ocean.in file parameters are wrong? GET_3DFLD - salinity climatology, 2018-09-16 00:00:00.00 (Grid=02, Rec=2, Index=2, File ...

zhaolv

I just started to learn roms recently, but when I was studying, I found that I could not generate forcing files. I use the matlab toolkit in the coawst model, where the ncei_ 2roms.m file is used to create the forcing file. But I don't know why there are always errors. I found that the NAM address ...

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