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Abstract: This paper presents an efficient algorithm for generating a spherical multiple-cell (SMC) grid. The algorithm adopts a recursive loop structure and provides two refinement methods: (1) an arbitrary area refinement method and (2) a nearshore refinement method. Numerical experiments are carried out, and the results show that compared with the existing grid generation algorithm, this algorithm is more flexible and operable.
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Key words:
- spherical multiple-cell grid /
- wave model /
- WAVEWATCH III /
- grid generation algorithm
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Figure 10. A 6-level arbitrary area refined grid. a. The polygons used to specify the refined area, and b. the final generated grid.
Figure 12. The curves used to define the range of the mesh refinement (a), the curves used to delimit the nearshore and offshore refinement ranges (b), and corresponding (6-level) grid (c).
Figure 14. Wind field scatter on September 1, 2020 at 00:00 (a), 06:00 (b), 12:00 (c), and 18:00 (d).
Figure 15. Wind field scatter of typhoon center on September 1, 2020 at 00:00 (a), 06:00 (b), 12:00 (c), and 18:00 (d).
Figure 16. Significant wave heights on September 1, 2020 at 00:00 (a), 06:00 (b), 12:00 (c), and 18:00 (d).
Figure 17. Cumulative distribution of the characterization of energy on September 1, 2020 at 00:00 (a), 06:00 (b), 12:00 (c), and 18:00 (d).
Table 1. Comparison of grid generation algorithms
Met Office Durrant and
SaulterThis paper Refinement method nearshore
refinementrectangular area refinement arbitrary area refinement and
nearshore refinementLevel of refinement fixed unfixed unfixed Degree of
completioncompleted under development completed 
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Table 2. Resolution list
Algorithm Region Resolution 4-level SMC grid nearshore lat: 0.058°, lon: 0.087° nearshore lat: 0.116°, lon: 0.174° nearshore lat: 0.232°, lon: 0.348° open sea lat: 0.464°, lon: 0.696° 6-level SMC grid nearshore (China) lat: 0.014°, lon: 0.021° nearshore (China) lat: 0.028°, lon: 0.042° offshore (China) lat: 0.058°, lon: 0.087° Northwest Pacific lat: 0.116°, lon: 0.174° North Pacific lat: 0.232°, lon: 0.348° global lat: 0.464°, lon: 0.696°
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