两种网格下的SWAN模式对黄渤海海浪模拟比较

Comparison of ocean wave simulation with SWAN wave model using two kinds of computational grid in the Bohai Sea and the Yellow Sea

采用NCEP再分析风场作为驱动海浪模式的强迫场,在考虑相同物理过程和分辨率基础上,SWAN海浪模式分别采用矩形网格和非结构三角网格对2000年12月黄渤海海域波浪场进行模拟,并将模拟的有效波高与海洋浮标观测数据作对比分析,结果表明,SWAN模式运用两种网格均能够取得良好的模拟结果,相对矩形网格,非结构三角网格模拟有效波高效果较好,且能够较好的刻画复杂地形。最后,采用局部加密的非结构三角网格对黄渤海波浪场进行模拟验证,分析表明非结构三角网格的局部加密方案可以进一步提高加密区域的有效波高模拟精度。

Driven by the NCEP reanalyzed winds,the rectangular and unstructured triangular grids is applied re-spectively to the SWAN（Simulating Waves Nearshore） wave model based on the same physical processes and grid resolution to simulate the ocean wave field of the Bohai Sea and the Yellow Sea in December 2000.The sim-ulated significant wave height is compared with the observed data from the buoys.The result demonstrates that the SWAN model used by both kinds of grids can reproduce reasonably the significant wave height.Comparing to that of the rectangular grid,application of the unstructured triangular grid can not only obtain better result,but also has the advantage of portraying the complex coastal regions.Moreover,a refined unstructured triangular grid is used by the SWAN model to simulate the ocean wave field,and the results show that the application of re-fined unstructured triangular grid can further improve the accuracy of the simulated significant wave height in the refined regions.