- 更多网络例句与下击暴流相关的网络例句 [注：此内容来源于网络，仅供参考]
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This paper makes an analysis of the Doppler speed charts of clear weather and the echoes of large-area precipitation. It also singles out the Doppler speed charts of typical wind fields. In addition, this paper analyzes Doppler radars detecting process of the strong convection current weather system. It also conducts a thorough analysis of Doppler echo features of some hazardous weather, such as cell storm and downward storms. Based on this research and analysis, the paper reaches some important conclusions concerning the detecting methods using Doppler radar and the analysis of the information gathered by Doppler radar.
本文通过分析晴空和大面积降水回波的多普勒速度图像，归纳总结出了典型风场的多普勒速度图象，并着重分析了多普勒雷达对严重危害飞行安全的强对流天气系统的探测，特别是深入分析了超级单体风暴、下击暴流等灾害性天气的多普勒回波特征，得出了多普勒雷达对灾害性天气进行探测的方法、雷达资料分析应用等方面许多有益的结论。
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The authors discuss a new numerical simulation method of the downburst wind loads on the basis of the previous research. Firstly, the wind speed is expressed as the sum of an instantaneous mean wind speed and an amplitude-modulating non-stationary fluctuating wind speed. Secondly, a new method based on the modified Osegguera and Bowles/Vicroy model to simulate the mean wind is presented and the fluctuating wind is simulated by a modified spectral representation method.
在将下击暴流风速表达为时变的平均风速和调制的非平稳脉动风速之和的前提下，本文采用基于改进的OBV模型Oseguera and Bowles/Vi-croy(OBV的方法来模拟平均风速，其平均风速直接由改进的OBV模型表达，而不同于已往研究中将平均风速表达为竖向风剖面与时间函数的乘积，并采用结合快速傅里叶变化的谐波叠加法来模拟调制的非平稳脉动风速。
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The unsteady numerical simulation is helpful to understand the dynamics of downburst wind.
非定常的数值模拟将有助于更好地理解下击暴流风的动力特征。
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The research confirmed that the wind field characteristics of downburst are quite different from boundary layer winds.
研究证实，下击暴流风具有同常规的大气边界层近地风完全不同的风场特征。
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As a kind of high intensity winds, the downburst usually comes forth during thunderstorm and has caused numerous structural failures around the world.
作为自然界的一种强风荷载，雷暴天气产生的下击暴流风在世界范围内造成了大量工程结构物的破坏。
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It was pointed that the study of downburst wind loads would provide the basis and guides for constructing the next wind tunnel emulating thunderstorm environment and downburst-resistant design of transmission tower-line systems; simultaneously it would give an important reference to both the design and implementation of wind-induced vibration control of transmission tower-line systems.
指出了对下击暴流风荷载的研究将为我国建造模拟雷暴风环境的新一代风洞实验室和输电塔线体系的抗下击暴流提供理论基础和设计指导，同时为输电塔线体系的风致振动控制设计与实现提供重要的参考。
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The results achieved by the unsteady simulation on the basis of Reynolds averaged Navier-Stokes are fitted to the experiential wind profile well. The results indicate that the numerical simulation based on CFD provides a new solution to study the downburst wind characteristics under the current conditions without detailed full scale data.
数值结果表明，基于雷诺平均的Navier-Stokes方程进行的非定常数值模拟结果同根据实测数据提出的三种经验风剖面吻合良好，在目前实测资料稀少的情况下，有助于更好地研究下击暴流风的基本特征。
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As the characters showing, the start of storm trailed off, the height of the top and the strong center of echo falling down indicates the downburst begin.
3多起下击暴流过程发生时回波顶、强回波中心高度下降，表明风暴减弱的开始是下击暴流开始形成的显著特征。
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Careful analysis on NBE can facilitate nowcasting of severe weather events and further understanding of their evolution. After detailed study on three cases concerning with NBE, it is concluded:(1) NBE triggered by fast moving echo in upstream is an important indication of disastrous wind;(2) NBE can develop into severe storm under proper conditions. There are often two stages during this kind of growing: the first is developing of initial echo, the second is snap growing of echo core;(3) Doppler radar reflects outflow of downburst as a nearly ringed NBE. Inside look on downburst can be obtained combining NBE with other data.
文章结合发生在上海的3次强对流天气个例，详细分析了弱窄带回波在分析和预报强对流天气中的作用，得出以下结论：（1）上游移动强回波的出流边界导致的弱窄带回波是大风预警的重要判断参考；（2）在合适的层结状态和抬升条件下，弱窄带回波会强烈发展，并导致局地雷雨大风，这类强对流天气的发展有两个比较重要的阶段：弱窄带回波上初始回波的发展和回波跃增；（3）下击暴流造成的地面出流在雷达回波上表现为近似圆弧的弱窄带回波，这种弱窄带回波与其他雷达观测特征以及地面观测相结合，有助于对产生下击暴流的对流云的发生发展过程进行细致分析。
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The charcateristics of microburst were described,and the Doppler velocity field structure of a wet type microburst occurring on July 22,1997 in Beijing area has been researched.
文中概述了微下击暴流的特征，研究了 1 997年 7月 2 2日发生在北京地区的一个湿型微下击暴流的多普勒速度场结构；
- 更多网络解释与下击暴流相关的网络解释 [注：此内容来源于网络，仅供参考]
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headwind：顶头风
当微下击暴流击中飞机时,突然增强的顶头风(Headwind)会令飞机升力增加. 一些未遇过微暴流的飞行员就会减速以减低升力. 之后飞机会穿过微暴流中心进入顺风带,顺风又会再令飞机的升力减少,最后飞机会因升力不足而坠毁.
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downburst：下击暴流
"returning flow weather","回流天气" | "downburst","下击暴流" | "El Nino","厄尔尼诺"
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microburst：微下击暴流
风切变要看机场的地理位置,一般雷暴可以引起风切变,因为雷暴最为人知道的是造成微下击暴流(microburst),一个在雷暴区急速下降的偏冷气流,到地面的时候就向外扩散,虽然范围很小(大约4公里)但是强度很大,因此破坏性大.