Development of Embedded Two-Way Nesting in the Navy Coastal Ocean Model
Abstract
We report on the effort to implement and test embedded two-way nesting in the Navy Coastal Ocean Model (NCOM), which can run as a stand-alone ocean model, as well as a component within the Coupled Ocean/Atmospheric Mesoscale Prediction System (COAMPS). Details of the nesting procedure are documented, with particular attention on the feedback of the modeled fields from the child grid (fine mesh) to the parent grid (coarse mesh). The inconsistency between the 3D baroclinic velocities and the depth-integrated transports in the feedback is inherently due to the presence of bathymetry. This is addressed. The nesting procedure in NCOM is tested using simulations of idealized problems with well-defined solutions, and of real coasts with strong river-plume influences. Evaluations are made by comparing the results from one-way nested, two-way nested, and non-nested simulations. A preliminary comparison with field data is included. The two-way nesting procedure is shown to smoothly fuse the fine-mesh fields into the coarse-mesh ones, improving the consistency of the solutions on the different grids, especially incases where the model results are sensitive to the grid resolution.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 18, 2020
- Accession Number
- AD1109572
Entities
People
- Cheryl A. Blain
- Jie Yu
- Paul J. Martin
- Timothy J. Campbell
Organizations
- United States Naval Research Laboratory