An empirical model of a downburst
An empirical model of a downburst
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DOI：
10.1016/s0141-0296(99)00058-9
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发表时间：
2000-09
影响因子：
5.5
通讯作者：
J. Holmes;S. Oliver
中科院分区：
文献类型：
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作者：
J. Holmes;S. Oliver
“下爆”被定义为一股强烈的下沉气流，它会在地面或地面附近引发破坏性风的爆发。这种情况通常发生在雷暴期间。有充分的证据表明，在澳大利亚和其他几个国家，降暴导致高压输电塔频繁故障。本文描述了由“环境”风速（或平移速度）和撞击射流产生的径向风的矢量总和产生的行进下暴中水平风速和方向的模型。该模型与1983年发生在安德鲁斯空军基地的一次高强度下暴的记录数据吻合良好。
A “downburst” was defined as a strong downdraft which induces an outburst of damaging winds on or near the ground. Such events normally occur during thunderstorms. It has been well documented that downbursts cause frequent failures of high voltage electricity transmission towers in Australia, and several other countries. The present paper describes a model of the horizontal wind speed and direction in a travelling downburst, generated by the vector summation of the “environmental” wind speed, or translation speed, and the radial wind generated by an impinging jet. Good agreement is achieved between the model and recorded data from a high intensity downburst that occurred at Andrews Air Force Base in 1983.