HU Shipeng,WANG Haijiang,HE Jiaoyang,et al.Doppler Radar Wind Velocity Simulation of Middle-layer Airflow Around Thunderstorms and Two Divergence Zones Existing at the Same Time[J].Journal of Chengdu University of Information Technology,2020,35(01):7-14.[doi:10.16836/j.cnki.jcuit.2020.01.002]
环绕雷暴的中层气流和同时存在两个辐散区多普勒雷达风场速度的模拟
- Title:
- Doppler Radar Wind Velocity Simulation of Middle-layer Airflow Around Thunderstorms and Two Divergence Zones Existing at the Same Time
- 文章编号:
- 2096-1618(2020)01-0007-08
- Keywords:
- wind field; simulation; superposition
- 分类号:
- TN985.2
- 文献标志码:
- A
- 摘要:
- 基于风矢量与其分量之间的数学关系,主要通过数学模型构造风场,增加一定的假设条件进行计算,模拟同时存在两个辐散区的风场和环绕雷暴上升区的中层气流场。得出:(1)当同时有两个辐散区相互作用时,多普勒速度回波特征是由两个辐散场的线性叠加产生的。通过分析反演图像,实验结果表明提出的方法可以形成具有代表性的风场,对复合风场的线性叠加具有很好的模拟效果。(2)在雷暴这种剧烈的天气现象中,由于中层的环境风场受到上升气流的阻碍,会形成辐合带,为雷暴的发生提供有力的动力条件,从而导致近地面的各种气象要素发生变化,这种气象的变化对雷暴的发生有一定的指示作用。(3)在反演风场中加入数学模型确实能得到理想的效果,并且在实验场内就能观察不同风场的情况,为以后分析复杂风场提供了方便。
- Abstract:
- Based on the mathematical relationship between wind vector and its components, it is to use a mathematical?倓model construct wind fields mainly,adding some certain assumptions into the numerical calculation to simulate when inversion is simultaneously exists in two wind fields of divergence zone as well as the middle-layer airflow of the riser of rotated thunderstorm.We can conclude that:(1)When two divergence zones interact with each other at the same time, the characteristics of Doppler velocity echo are produced by the linear superposition of two divergence zones.Throughout the analysis of inverted imagines,the result of the experiment shows that the method can form a representative wind field,which has a great simulation effect for the linear superposition of the compounded wind field.(2)In the intensive climate phenomena such as thunderstorm,a convergence band is generated because the middle-layer environmental wind field is prevented by the riser airflow. And it will supply with advantageous dynamic condition for the occurrence of thunderstorm so that leads to the variety of multiple meteorological factors on the ground which have indicative function on the happening of thunderstorms.(3)Not only under the experimental field we can observe variety of circumstances of compounded wind fields, but also the ideal effect can be achieved on the condition of the mathematical model is added into the inversion wind field, it is convenient for analyzing complex wind fields.
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备注/Memo
收稿日期:2019-11-15基金项目:国家自然科学基金资助项目(U1733103); 四川省科技厅资助项目(2018JZ0030)