基于台风“威马逊”的台风浪数值模拟研究

Numerical Simulation of Typhoon Wanes Based on the Typhoon 'Rammasun'

本文运用ECMWF提供的再分析数据风场,同时加以Jelesnianski-Ⅱ模型生成的风场为驱动风场,建立了一个基于第三代海浪模式SWAN的台风波浪数值模型。以2014年9号台风"威马逊"为例,借助实测的台风期间的波浪要素(波高、波向、周期)数据,与通过SWAN模型的模拟结果作比较,对比结果较好。在此基础上,分析了"威马逊"台风波浪要素的时空分布特征,得出台风移动方向的中心右侧为最大风速区,风速和有效波高均较大,波向基本与风向一致;在台风移动方向的中心左侧,为较小风速区,风速和有效波高比右侧小,并且波向和风向不一致。

This paper uses the ECMWF reanalysis data of wind field, along with a wind field generated by the Jelesnianski-II model as a driver, to establish a typhoon wave numerical simulation model based the third-generation wave model SWAN. Take the No. 9 typhoon Rammasun＂ in 2014 as an example, the measured wave elements （wave height, wave direction, period） are compared with the simulated re- suits of the SWAN. The results are quite good. On the basis of the above analysis, the spatial and tem- poral distribution of typhoon ＂Rammasun＂ for the wave elements were analyzed. It is concluded that on the right of the center of the typhoon moving direction is the maximum wind speed region. Wind speed and effective wave height are quite high, and the wave direction is consistent with the wind direction. On the left of the center of the typhoon moving direction is the smaller wind speed area. Wind speed and significant wave height smaller than those on the right, and the wind and wave direction are incon- sistent.