- 作者: 劉廣英
- 作者服務機構: 空軍氣象聯隊
- 中文摘要: 雙颱風間的交互作用對颱風路徑預報頗有影響,因而研究者甚多。本文透過簡化後的颱風中心運動方程,求得分析解,來探討雙颱風系統在純交互作用下的運動性質,結果獲得下述重要特徵:(1)雙颱風系統的相對運動取決於起始時的相對角加速度及徑向加速度,其中θ及γ為二颱風中心的相對方位與距離;(2)與各有三種起始狀況即雙颱風間的相對運動總共有9種起始條件,可描述出10種相對路徑;(3)在10種相對路徑中有兩種是順時鐘旋轉另8種則為逆鐘向旋轉;(4)相互影響下的雙颱風中心可接近亦可遠離,但由於二颱風間的作用力於臨界距離時最大即γ時均減小,故在純交互作用下相互移近的雙颱風中心不會重合;(5)在相對運動中θ'及γ'均可變號,即相對旋轉可由順轉變逆轉亦可由逆轉變為順轉,而相對距離可由漸近變漸遠亦可由漸遠變漸近。 在本文的第二部分,我們由最近25年颱風記錄中選出了一些實際的個案,以之與理論分析結果相較,由而可知大部分的理論路徑都有類似的實例發生過,未發生過的係相對成等距順轉或逆轉的兩種。基本上說,上述兩種路徑只在理論上存在而實際上是難以發生的,因為實際的雙颱風運動多少均會受到交互作用以外因素的影響。
- 英文摘要: The interaction of binary typhoons has been studied by many meteorologists in the past. This paperpresents an analytical solution of the equation of motion of the two centers which are influenced by eachother only. The result reveals that (1) the relative motion of the binary system depends on the initial con-ditions of and (the angular and radial accelerations);(2) there are 9 initial conditions which construct10 types of relative motion, among them, 2 types rotate clockwise and 8 types rotate in a counterclockwisesense, (3) the interacting centers may move away from or toward each other but, due to the interactingforce which approaches its maximum as r→ (a critical distance between the two centers), may not becoincided by pure attraction. In the second part of this paper several actual cases of binary typhoons are selected and used forcomparative study. It shows that most theoretical relative motion types can be found in reality.
- 中文關鍵字: binary typhoons; typhoon tracks; vortices interaction
- 英文關鍵字: --