Ocean Modeling Discussion

One hack we have used is to modify the nudgcoef.nc array, adding a non-zero inverse timescale to places we want to slow down. This is a 3-D array so you can have variation in the vertical as well as horizontal. Then we set u, and v to zero in the ocean_clm.nc in the same regions, and turn on ...

Have you tried logarithmic drag? In [1], it says Because the vertical elevation of the velocity in the bottom computational cell will vary spatially and temporally, the inclusion of the elevation provides a more consistent formulation. For testing purposes, it may be possible to disable LIMIT ...

" I think that the problem lies in the fact that bustr/bvstr are multiplied by 0.5_r8*(Hz(i-1,j,1)+Hz(i,j,1)) and are only applied to the bottom layer in the baroclinic mode." How many vertical layers do you have? What Critical depth do you have? And what are the values of bottom and surface ...

Do you think it is due to the vegetation, or just that the water is shallow? you could use the VEGETATION option that we have in coawst. it extracts momentum from the water column up to the veg height, and this has been shown to reduce flow in those areas. Beudin, A., Kalra, T. S., Ganju, N. K ...

Hello everyone, I am currently working on modeling Florida Bay, which consists of multiple sub-regions characterized by mud banks with seagrass. These areas are very shallow, with depths less than 30cm, and some parts are only submerged during high tide. Unfortunately, I am encountering difficulties ...

Thanks John. I think that is the problem, the volume is not conserved on the bot right boundary. I averaged h for the child grid file, and subtracted the parent h on the child domain. The plot shows the differences bathy.png I will fix the bathymetry and see if one-way nesting works. Thanks Phillip ...

Thanks arango and philip for the reply and I hope everyone here had a happy Christmas and New Year. I apologize for the late response, I was on a break last week. My background is in applied math (numerical pdes and math modeling) and I'm relatively new to ocean modeling. I'm ignorant on some of the ...

Hello everyone, I'm constructing a nested model for Florida Bay area. The water level calculation is wrong for one-way nesting, but two-way nesting doesn't have the problem. The only thing I changed was the cpp option. Here are plots of daily average water level for one-way nesting: day 1: zeta_day1 ...

Sankar wrote: ↑Tue Dec 13, 2022 9:28 pm Thanks yuchengzhang for your quick response. But can you please tell me how to add a sponge layer in bathymetry. I mean I have to add the sponge layer in the tool where I have made the grid file.

Here is the link,
https://www.myroms.org/projects/src/ticket/627

It seems that the blew up is happening near the boundary for w, I had a similar problem and I think there were huge bathymetry differences near that point. It was solved by adding a sponge layer.

The problem had to do with ROMS version, I updated the version from 3.7 to 4.1 and ran the model, the problem disappeared. So, it's highly likely ROMS 3.7 had a bug somewhere and it got fixed. Anyway, the lesson is, run the model with newer version....

There are issues for the child domain when I run the model. One major problem is the surface elevation keeps dropping for the child domain. Initial condition for Zeta: zeta_1.png After 1 day: zeta_9.png u and v behaved OKish: u_9.png v_9.png When I plot the graph for zeta using rst file for the ...