摘要
通过选取近海岸100 m测风塔获取的10 m、50 m、65 m、80 m、100 m等5个高度台风和季风风场强风样本,研究强风条件下近地台风和季风风场的平均风剖面参数合理取值,应用Bootstrap统计分析方法,分析了强风样本容量较小条件下平均风剖面参数变异性及置信区间。分析结果表明:近地台风风场平均风速剖面符合指数律或对数律,台风风场风剖面指数均值为0.12,95%置信度条件下的置信区间为[0.117,0.125];季风风场风剖面指数均值为0.07,95%置信度条件下的置信区间为[0.065,0.070];台风和季风风场平均风剖面指数均值估计的概率分布呈高斯分布特征,均值的置信区间相对较窄、趋于稳定,分析结果具有较好的精度和可信度。
Mean wind speed profile parameters of strong winds in surface boundary layer were stud-ied by the bootstrap method based on small wind data samples which were recorded from a 100 m meteorological tower at the site near seashore under strong winds like typhoons and monsoon. The variation of mean wind speed profile parameter and the relationship between mean wind speed profile parameter and sample size with the confidence interval were analyzed. The results reveal that, in the near-surface range （〈100 m） , the vertical distribution of mean wind speed can be well described by a logarithmic law and a power law. The mean values of exponent of power-law profile were 0. 12 and 0. 07 in the typhoons and monsoon wind climates, respectively for the coastal terrain. Moreover, its＆amp;nbsp;confidence interval was [ 0 . 117 , 0 . 125 ] and [ 0 . 067 , 0 . 074 ] respectively at the confidence of 95%. It is found from the analysis the probability distribution of power-law index was found to follow the Gaussian distribution, and their confidence interval of the mean values of exponent were relative-ly narrow and tended to be stable. The results rationally demonstrated the precision and credibility of the proposed method for the mean wind speed profile parameter based on small samples of strong wind speed.
出处
《广西大学学报（自然科学版）》
CAS
北大核心
2015年第4期856-861,共6页
Journal of Guangxi University（Natural Science Edition）
基金
国家自然科学基金资助项目(51308140)
广西自然科学基金项目(2012GXNSFGA060001
2013GXNSFBA019232)
广西岩土力学与工程重点实验室立项项目(12-A-02-011)
广西高校科研项目(2013YB104)
