Field Measurement Study on Wind Characteristics at Puli Great Bridge Site in Mountainous Area

To obtain the wind characteristics in mountainous area, the wind field measurement at Puli Great Bridge site was conducted. A data collection system for high-frequency wind speed based on wireless transmission was developed. The mean wind characteristic was analyzed. The non-stationarity and non-gaussianity of the fluctuating wind were investigated. The results show that the new system has the advantages of real-time transmission, low cost and no field monitoring compared with the traditional method. The majority of strong wind occurs from February to April annually in the southwest direction. The proportion of the thunderstorm is about 15%among the selected strong wind during the field measurement. The wind attack angle varies from -10 to 0 degrees. The wind profile index ranges from 0 to 0.14,and the mean value of the probability density distribution is 0.56 which is less than 0.12, its minimum in the specification. It illustrates that the wind profile in the mountainous area cannot be well described by the specification. The wind speed sample with both non-stationarity and non-guassianity is measured in the mountainous area, and its instantaneous maximum speed can reach to 22.0 m/s.