文档介绍：螺旋结构雨团模型中的水平结构方程和讨论
张铭1,
1. 全军危险性天气监测预警研究中心,解放军理工大学气象学院,南京,211101
2. 解放军65301部队,长春,130022
摘要:在圆柱坐标中本文通过引入位相函数,重新推得了模型雨团中的水平结构方程,并做了讨论。得到了以下结果:在距该圆柱坐标中心足够近处,该雨团是圆对称的,无螺旋结构;而在距该中心足够远处,该雨团可存在螺旋结构,并可得到该处螺旋结构雨团垂直运动的的近似表达式。该结果与实际螺旋结构雨团相一致,而这弥补了我们早先结果的局限。
关键词:雨团模型,螺旋结构,水平结构方程
The Horizontal Structure Equations and Discussion of
Rain Clusters with Spiral Sturcture
ZHANG Ming1, YU Jie1,2
1. PLA research centre for severe weather monitoring and warning, Institute of Meteorology,
PLA University of Science and Technology, Nanjing 211101, China
2. NO. 65301Army of PLA, Changchun 130022, China
Abstract: By introducing the phase function to rain clusters model in cylinder coordinates, the new horizontal sturcture equations were obtained and discussed. The main conclusions were as follow. Near the center of cylindrical coordinates, the rain cluster was round symmetrical, without spiral structures. Whereas away from the center, the spiral sturcture might appear in rain cluster and the expression of vertical motion in spiral structure was obtained. The result was consistent with real spiral rain cluster. It remedied the early limitation in our conclusion.
Keyword: rain cluster model, spiral structure, horizontal structure equations
1. 引言
雨团是直接产生暴雨的中尺度系统,对雨团的研究不仅在中尺度动力学上具有重要的理论意义,对暴雨预报也有很大的应用价值。我们曾建立了一个轴对称雨团的数学模型,采用解析研究的方法得到了该模型的解,用以研究圆对称雨团的结构和演变(实际中大多数雨团均可看作圆对称的),还分析了该模型中的位