The impact of catastrophic winds such as typhoon , downburst , and tornado on transmission lines is introduced , including collapse of transmission towers 重点介绍了台风、飑线风、龙卷风等强风暴下输电线路所受的影响以及输电塔倒塌等情况。
2.
The three - dimensional cloud model with hail - bin microphysics could simulate the characteristics of the severe storm such as life cycle , rainfall distribution and diameter of hail well , and also could produce strong downdraft and wind shear ( downburst ) 而利用三维强冰雹云模式对此次强风暴的生命史、降水分布、降雹的大小等要素做了较好的模拟，并能够模拟出伴随强风暴过程所产生的强下沉气流和及地面强风速切变(下击暴流) 。
3.
The mechanism of the downburst formation was also investigated based on the cloud microphysics of the simulated storm and it was found that this downburst was primarily produced by hail loading , and enhanced by hail melting and rain evaporation . and the loading and the melting of hail played a very important role in producing the downburst . the gale at the surface was caused by the severe downburst 从云微物理学角度分析了此次局地性大风的形成原因，认为由高空冰雹粒子的拖曳产生的负浮力作用是促发强下沉气流产生的主要原因，其次是冰雹的融化和雨水蒸发冷却对下沉气流起加速作用，冰雹的拖曳和融化作用对下沉气流具有决定性的作用。
4.
Typical variable windfield models , such as large scale steady wind flow , downburst , turbulence , airflow over mountain , are developed and their physical specialities are discussed . furthermore , simplex modules are integrated to form complex model . facticity and application technique to flight simulation are discussed 讨论了以下几种典型风场模型(大尺度均值风模型、 dryden紊流模型、微下击暴流模型和过山气流模型)的物理特征与建模方法，并对单一模型进行复合，建立变化风场模型库，最后讨论了各种模型的真实性与如何应用于飞行仿真； 3
