| 关于积云增雨和实施方案的探讨 |
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| 引用本文： | 许焕斌,田利庆,段英.关于积云增雨和实施方案的探讨[J].气象科技,2005(Z1). |
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| 作者姓名： | 许焕斌 田利庆 段英 |
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| 作者单位： | [1]北京应用气象研究所 [2]中国科学院大气物理研究所 [3]河北省人工影响天气办公室 北京 |
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| 基金项目： | 河北省科学技术研究与发展项目(03220602D),国家自然科学基金项目(40475006)、(40275001),天津市科技攻关培育项目(033122011)共同资助 |
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| 摘 要： | 在综合雷雨云式的积云降水特点和归纳观测及理论结果的基础上,用数值模拟研究了阵雨形成机制,发现雷雨云式的积云结构类似于雹云,也存在着水平风“零域”和成雨“穴道”,大粒子群向这里集中并累积,然后再下泻成阵雨。据此提出了积云人工增雨的动力学根据和设计实施方案的要领,并给出了积云人工增雨作业部位、时机的概念模型。
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| 关 键 词： | 积云降水 阵雨形成机制 宏微观相互作用 积云增雨 |
Cumulus Cloud Rain Enhancement and Design of Operation Scheme |
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| Xu Huanbin Tian Liqin Duan Ying.Cumulus Cloud Rain Enhancement and Design of Operation Scheme[J].Meteorological Science and Technology,2005(Z1). |
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| Authors: | Xu Huanbin Tian Liqin Duan Ying |
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| Institution: | Xu Huanbin~1 Tian Liqin~2 Duan Ying~3 |
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| Abstract: | On the basis of summary of the precipitation characteristics and the observable or theoretic results for cumulus clouds,the mechanisms of shower formation were investigated by use of numerical simulation.It is concluded that two processes,the accumulation of raindrops and the breakdown of rain groups,induce showers.It is very similar to the mechanism of hail formation;i.e.due to the airflow field is convective,there is a dynamically attractive area located by the main updraft and the horizontal velocity of the airflow is close to zero((zero) zone).In hailstorms,there exists a "cave channel" of hail(CCH) located below the zero region.The area of ice embryo formation is in the entrance-end of the cave channel and the area of hail formation is in the exit-end of the cave channel.Once a particle enters the cave channel,it cannot escape the attraction of CCH,just like a trap,until it became a large stone and falls down from the exit-end.In the cumulus clouds,there is also a "cave channel" of rain(CCR).Particles(raindrop or hailstone) may come together,and then accumulation occurs;when the average size of the rain-group is grown up exceeding a critical value,the raindrops suddenly fall down and showers occur.The main points of the implementation scheme for rain enhancement are suggested and the conceptual model about the proper operating location and time of cloud seeding operations is given. |
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| Keywords: | cumulus precipitation formation mechanism of shower macro-and micro-interaction rain enhancement for cumulus |
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