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北部湾沿海最大风速分布特征及工程设计风速推算
引用本文:苏志,范万新,黄颖,周绍毅.北部湾沿海最大风速分布特征及工程设计风速推算[J].台湾海峡,2010,29(2):167-172.
作者姓名:苏志  范万新  黄颖  周绍毅
作者单位:广西区气候中心,广西,南宁,530022
基金项目:广西自然科学基金资助项目 
摘    要:利用北部湾沿海7个气象站建站至2008年的年最大风速资料,采用指数律风速廓线公式和"时次换算"方法对年最大风速进行订正,得到长年代10m高度10min平均年最大风速序列;采用离差系数Cv分析最大风速的年际变化,应用极值Ⅰ型分布推算北部湾沿海距地10m高50a一遇和100a一遇风速的极大值.结果表明,北部湾沿海年最大风速多出现在7~9月,年最大风速离差系数Cv为0.22~0.35,与沿海城市上海、福州、广州相近;北部湾沿海50a一遇、100a一遇风速的极大值分别为22.9~42.6和24.8~46.5m/s,其空间分布特征是:越靠近海的地方多年一遇风速的极大值就越大.

关 键 词:物理海洋学  风速  极大值  分布特征  极值Ⅰ型分布  北部湾

Distribution characteristics of maximum wind speed and wind speed calculations for engineering design purposes on the Beibu Gulf coast
SU Zhi,FAN Wan-xin,HUANG Ying,ZHOU Shao-yi.Distribution characteristics of maximum wind speed and wind speed calculations for engineering design purposes on the Beibu Gulf coast[J].Journal of Oceanography In Taiwan Strait,2010,29(2):167-172.
Authors:SU Zhi  FAN Wan-xin  HUANG Ying  ZHOU Shao-yi
Institution:(Guangxi Climate Center,Nanning 530022,China)
Abstract:Annual variations in maximum wind speed in 10min at 10m height were calculated from annual maximum wind speed datasets from seven meteorological stations on the Beibu Gulf coast(covering time spans from the founding date of each station to 2008).Annual maximum wind speed was calculated using an modifiable method for the exponential law wind profile formula with timing conversion.Analysis of the annual variation in maximum wind speed using the coefficient of variation Cv and calculations of the 50a and 100a return-period annual extreme wind speed at 10m altitude was conducted using the Fisher-Tippett I distribution.The results show that the annual maximum wind speed on the Beibu Gulf coast most often occurs between July and September,with coefficients of variation(Cv) between 0.22 and 0.35,similar to that of the coastal cities',like Shanghai,Fuzhou and Guangzhou.The 50a and 100a return-period annual extreme wind speed were 22.9~42.6m/s and 24.8~46.5m/s,respectively.Spatially,the greater the proximity to the sea,the higher the return-period annual extreme wind speed.
Keywords:physical oceanography  wind speed  extreme  distribution characteristics  Fisher-Tippett I distribution  Beibu Gulf
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