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| Format: | Recurso digital |
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Zenodo
2026
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| Online Access: | https://doi.org/10.5281/zenodo.18918648 |
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Table of Contents:
- <p>The .opt and .in files for each of the parent and child grid simulations in the BoB model configuration are provided in the ROMS_BoB_Config.zip archive.</p> <p>The <strong>dynamic Orlanski</strong> radiation boundary condition with sponge tuning is implemented across the velocity and tracer open-boundary routines u3dbc_im.F, v3dbc_im.F, and t3dbc_im.F, with the adaptive sponge coefficients computed in the module sponge_tune.F. In the routines u3dbc_tile, v3dbc_tile, and t3dbc_tile, the Orlanski radiation condition (OBC_M3ORLANSKI for velocities and OBC_TORLANSKI for tracers) updates the boundary value using a dynamically estimated phase propagation based on local temporal and spatial gradients (dft, dfx, dfy) and the coefficients cx, cy, and cff, allowing signals to radiate out of the domain while reducing to pure boundary relaxation when the phase propagation is INTO the child grid (cx<0). In this latter scenario, a relaxation coefficient cext is computed from the prescribed boundary velocity or tracer forcing and scaled by the local Courant number. In the routine sponge_tune.F, this relaxation is further modified using spatially varying coefficients ub_west, ub_east, ub_north, or ub_south to smoothly blend the Orlanski solution with the prescribed boundary data from the parent grid. Essentially, the sponge layer at the boundary dynamically adjusts the boundary nudging strength in response to the strength of the incoming baroclinic wave fluxes from the parent model.</p> <p> </p> <p> </p>