Jets/problems on open boundary of 3D sigma model

2021-03-16T18:15:16Z

Hi All,
We are setting up a 3D sigma model with salt to look at circulation in the northern Gulf of Mexico, USA. The hydrodynamics appear smooth and reasonable for the 2D and 3D model, until meteorological forcing is included. Once the winds/pressure are applied, velocities on the open boundary become elevated and generate jets without ultimately blowing up the run. We have tried most of the numerical filters and other options without success. Has anyone seen this problem before or have experience stabilizing this type of model?

See the depth-averaged currents, top layer salinity, and a summary of the model:
https://rdedrivepub.erdc.dren.mil/url/mec3nkjiqgawtxeb pw: 84q2ddjd
https://rdedrivepub.erdc.dren.mil/url/rzd5yifztzpr2pbp pw: uz9r4a5b
https://rdedrivepub.erdc.dren.mil/url/quh2iucvvhpcgcj2 pw: tjnc3yrp

model set up:

10 sigma layers
cold start with 35 ppt initial salt distribution
constant, uniform 35 ppt salt condition on offshore open boundary
tidal water level on open boundary
15+ fresh water inputs on coast line
spatially, temporally varying winds/pressures from NOAA North American Regional Reanalysis products
36 MPI subdomains

Thanks
Cody JohnsonUS Army Corps of EngineersCoastal and Hydraulics Laboratory (CHL) Engineer Research and Development Center(601) 634-2552 (office)(239) 233-0155 (cell)Cody.L.Johnson@erdc.dren.milCody.L.Johnson@usace.army.mil