The IRI Grid System for Use with WAVEWATCH 3
NAVAL RESEARCH LAB STENNIS DETACHMENT STENNIS SPACE CENTER MS STENNIS SPACE CENTER United States
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This report describes a grid system created for use with the wave model WAVEWATCH III. The system uses three grids irregular grids at high latitudes and a regular grid at low latitudes, and so it is referred to as Irregular-Regular-Irregular IRI. There is two-way exchange of information wave spectra boundary forcing between grids. The grid system achieves efficiency by minimizing the variability of grid spacing, which allows a larger time step size. The northern grid extends to very high latitude 89N, and propagation is computed at third order accuracy. IRI systems have been created for four different resolutions approximately 12, 14, 16, and 18. The report includes a review of advantages and disadvantages of different grid approaches a description of important design considerations a description of the four designs timings validation samples and a discussion of the operational context existing and future systems.