Add river forcing with adjustable depth range condition for user-set diffusivity in MOM6

[Subrat-Kumar-Mallick]

The modification made here enhance control over diffusivity setting in MOM6. By incorporating river forcing and an adjustable depth range condition in the user_change_diffusivity.F90 file, user can now fine-tune diffusivity parameters based on specific depth ranges and runoff values, improving the model's accuracy in simulating oceanic processes affected by external forcing near the river mouth.

[marshallward]

Hi @Subrat-Kumar-Mallick, do you know if COAPS has its own fork to direct PRs to the main branch? That is how it is supposed to work, although I believe we have taken PRs directly from @abozec in the past, so perhaps we can do the same here.

[abozec]

Hi @marshallward, no we don't have a special fork at COAPS, since it is usually me or @awallcraft doing the PRs...

[marshallward]

After talking with @abozec, we decided that it might be easier to handle this (and perhaps future COAPS PRs) through the NOAA-GFDL fork, and to address some of the specific issues when @Subrat-Kumar-Mallick becomes available to work on them.

Closing this for now, but we will certainly revisit this one soon.

[Subrat-Kumar-Mallick]

Hi @marshallward, thank you for the response and discussion regarding my pull request.
I understand and respect the decision to handle this and future COAPS pull requests through the NOAA-GFDL fork.
Given this I would like to withdraw my current pull request.

Thank you for your understanding and consideration.