基于Holland台风模型及三重嵌套海浪模式的台风浪数值模拟研究

NUMERICAL SIMULATION OF TYPHOON WAVES BASED ON THE HOLLAND TYPHOON MODEL AND TRIPLE NESTED WAVE PATTERN

现有的风场资料存在台风中心附近风速偏低的问题。为改进台风期间风场数据,使用Holland经验台风模型结合多平台交叉校准数据(cross-calibrated multi-platform,CCMP)及欧洲中期天气预报中心的再分析数据(European Centre for Medium-range Weather Forecasts Reanalysis data,ERA5)风场资料,研究了不同台风最大风速半径(maximum wind radius of the typhoon,RMW)、Holland B参数对模拟效果的影响,确定了最优模拟参数,并以改进后的风场驱动三重嵌套海浪模型对台风“威马逊”发生期间的台风浪进行模拟。模拟结果与实测数据对比表明,(1)改进的风场资料与实测结果更为接近,作为海浪模式驱动项可更好地模拟台风期间波浪状况;(2)三重嵌套海浪模型的波浪模拟效果优于单独的海浪模型。

The wind velocity of existing wind field data is lower near typhoon center.To improve the quality of wind data during typhoon course,the Holland empirical typhoon model combined with CCMP and ERA5 wind data were used to investigate the effects of different typhoon maximum radius and Holland B parameters on the simulation results.The optimal simulation parameters were determined,and then the improved wind field was used to drive the triple-nested wave model to simulate wave field during Typhoon Rammasun.The comparison between the simulation results and the measured data shows that:(1)the improved wind field data are closer to the measured results,and can be used to better simulate the wave conditions during the typhoon as a driving term in the wave model;(2)the wave simulation effect of the triple-nested wave model was proved better than that of the individual wave model.