Reliability and Representative Assessments of Wind Observation Data in the Study of Typhoon Wind Resistance Engineering

The modern large-scale engineering of typhoon wind resistance mainly focus on the analysis of near surface wind characteristics in typhoon boundary layer. Based on the near surface wind observation data of several typhoons in recent years and combined with the characteristic of non-homogeneous cyclone circulation of typhoon and the characteristic of highfrequency sampling anemometer, the necessity of reliability and representative assessment of typhoon wind observation data in the wind resistance study and its potential impact on wind resistance parameters are analyzed and the method of basic data quality test and control are given. Effective integrity rate standard of basic data and the data representative assessment criteria and index of typhoon strong wind are propounded to apply in the study of typhoon wind resistance engineering. By analyzing and comparing the values calculated by the observation data of typhoon Hagupit, the following results are found: 1) Highfrequency wind data observed by ultrasonic anemometer processed by 4 times truncation variance method have a better data representative. 2) The outlier in the wind speed time series has significant impact on the reliability of wind resistance parameters. Even 2%-5% outlier can have a large effect on the wind spectrum. 3) Typhoon strong wind representative assessment index for the observation data should be abided by the variation characteristics of parameters demanded by the study of wind engineering at different positions of typhoon. 4) The basic criteria of typhoon strong wind representative assessment are the wind direction alters over 120° in succession and the wind speed curve versus time shows an “M” shape bimodal distribution. If the lowest wind speed between two peaks is less than 11m/s, it can be judged as the typhoon eye area.