Investigation of Gust Factors in Tropical Cyclones.
Investigation of Gust Factors in Tropical Cyclones.
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发表时间：
1974-06
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影响因子：
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通讯作者：
Gary D. Atkinson
中科院分区：
文献类型：
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作者：
Gary D. Atkinson
摘要：1972年热带气旋会议要求FLEWEACEN/JTWC在持续地面风速等于或超过50节时将最高阵风列入警告。在1972年期间，使用了由前联合台风警报中心人员得出的持续风/峰值阵风图。关于这张图是如何得出的细节还没有得到，联合台风警报中心预报员普遍认为，从这张图得出的阵风系数对于开放水域条件来说太高了。因此，在1973年的热带气旋会议上，FLEWEACEN/JTWC要求第七舰队所有配备风速计的船只在强风条件下在天气报告中包括最高阵风和持续风速。这些船舶观测和全面的文献调查导致了一个新的持续风/峰值阵风关系的推导，该关系在1973年季节由JTWC引入业务使用。这项研究表明，对于强风条件，阵风因素（即，在开放水域上空的最高阵风与一分钟平均持续风速的比率）应在1.20至1.25之间。（作者）
Abstract : The 1972 Tropical Cyclone Conference requested that FLEWEACEN/JTWC include peak gusts in the warnings when sustained surface wind speeds equal or exceed 50 kts. During 1972, a sustained wind/peak gust graph derived by former JTWC personnel was used. Details on how this graph was derived were not available and there was a general feeling among JTWC forecasters that the gust factors derived from this graph were too high for open water conditions. Therefore, at the 1973 Tropical Cyclone Conference, FLEWEACEN/JTWC requested that all 7th Fleet ships equipped with anemometers include peak gusts as well as sustained winds in their weather reports during strong wind conditions. These ship observations and a comprehensive literature survey led to the derivation of a new sustained wind/peak gust relationship which was introduced into operational use by the JTWC during the 1973 season. This study showed that for strong wind conditions, gust factors (i.e., ratio of peak gusts to one-minute average sustained wind speeds) over open water should fall in the range of 1.20 to 1.25. (Author)