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文章指出,由于台风风场中风速、风向随时间和空间急速地变化,越近台风中心风速越大、风区越短、风时越小,风浪就越是不可能充分成长。所以在台风浪数值计算工作中不能使用充分成长的海浪谱模式。作者等在最近提出的台风波浪数值预报方法(以CHGS表示)中,建立了一种成长海浪谱模式(如文中(2)式),该模式中包含了标志着风浪成长程度的参数——平均波龄β。当β值较小时,波浪的能量主要集中在谱的峰值频率附近,使谱峰高而陡,随着β的增大,谱形逐渐变得低矮坦缓,当β=1时波浪充分成长,成长谱转变成了充分成长的P-M谱。该模式还表现出了谱在“平衡域”内的“超射”现象。
The article points out that as the wind speed and the wind direction in the typhoon wind field change rapidly with time and space, the closer the typhoon center wind speed is, the shorter the wind speed is, and the smaller the wind time is, the more it is impossible for the wind and waves to fully grow. Therefore, we can not use the fully developed wave spectrum model in typhoon wave numerical calculation. In the recently proposed typhoon wave numerical prediction method (denoted by CHGS), a growing wave spectrum model (as in (2)) is established, which contains the parameters that indicate the extent of the wind and waves growth-the average Wave age β. When the value of β is small, the energy of the wave mainly concentrates near the peak frequency of the spectrum, making the spectrum of the peak high and steep. With the increase of β, the spectrum gradually becomes lower and lower, and the wave grows well when β = 1 , Growth spectrum into a fully grown PM spectrum. The model also shows the “super-shoot” phenomenon of the spectrum in the “equilibrium domain.”