Ocean Modeling Discussion

Hi, I have my model almost set up. But in order to save some run time , I have decided to change the geometry of one river so I have less cells on ETA direction. After converting the grid and all the necessary inputs for the dimension change, I realized that the model results are slightly changed ov...

Here for example is what NOAA NOS did to pad out cells in the land for their Chesapeake Bay CBOFS grid, which was computed with Delft tools. This shows "dy" grid spacing (1/pn) plotted in the grid i,j coordinates, because the filled bogus lon/lats in the land mess up my plotting routines ...

Yes, that's a problem. ROMS computes on all cells and then applies the masks. So, NaN values just inside the coastline can propagate into the interior. Zero values of, say, depth (but also other grid metrics) can cause divide-by-zero. Just fill the land with modest finite values and the masks shoul...

Hi, I have a model run blow-up at the first time step. My first suspect is the grid file generated with Delft3D. Variables like coordinates are all set to -999 or Nan for the masked grid cells when the grid is generated in Delft3D, while all the unmasked cells have normal values. So there is no way ...

Typically to provide a permanent wall, then use the mask _u _v _rho variables. ROMS is solved on a staggered grid, so when you set the mask_rho, then edit_mask (or similar) can determine the appropriate settings for mask_u and mask_v and mask_psi. However, it seems you want a special case, where 2 ...

Hi, all. I have a question hoping someone can help. Is it possible to put a thin wall between 2 grid cells, so there is no exchange at all between the cells? I have a situation that there is a thin wall in my domain, to separate neighboring cells, but I can't find any information related. I imagine ...

You can merge them before having ROMS read them and regrid/rotate them if they are both on lat/lon grids of the same resolution. You can copy the ROMS code for reading then regrid/rotating winds to also read/rotate/regrid say Unwind2 and Vwind2. Then you can come up with some means of merging them ...

Hi all I have a model domain that will require 2 different wind fields to be applied to different parts of the domain. I understand that if I have a global wind field in the forcing file, the global wind will be interpolated and rotated to fit the whole domain; and if I have a fully gridded wind fie...

kate wrote: ↑Thu May 27, 2021 5:17 pm

Adding a strip of land-masked cells is fair amount of work.

This is why it is good to know your tools. We have landmask editing in both Matlab and Python. Also, it is worthwhile to learn to edit netcdf files in SOME programming language.

Thank you.

If you put a one-cell wide strip of masked land down most of your west boundary, the open boundary condition can apply just to the "estuary". Thanks for your help. I thought about this as a possibility, but I wonder whether there is other option. This is because the pic I attached is a si...

Hi, I am new here trying to learn ROMS. I have a question regarding the selection of boundary condition, hand hope someone can help. I have a simplified domain like in the attached pic. I have ocean at east and south which can use open boundary. I have coastline and some river with inflows at the no...