Comparison of Strong Wind Characteristics Between Inland and Littoral of China Based on Field Measurements

There is a shortage of data of strong wind characteristics in Xinjiang. To compare wind field characteristics between inland area and coastal area, the data of strong wind characteristics at Chaiwobao station in Dabancheng, Xinjiang and at Shatian station, Dongguan City are obtained. The instrument configurations used for field measurements are presented, and the data quality is evaluated. Then the average wind field characteristics including wind velocity, wind direction, wind velocity profile and turbulence intensity were compared between the two stations. According to the results, (1) the extreme wind velocity at Chaiwobao station is 39.2 m/s, which is higher than that of the station in typhoon zone (32.9 m/s). However, the occurrence time of maximum wind velocity is different. The maximum wind velocity occurs in winter and spring in Xinjiang and in summer and autumn in coastal typhoon zone; (2) the wind direction distribution is also different. The regions of strong wind in Xinjiang show a consistent distribution pattern all the year round due to the orientation of the mountains flanking the valley. But in Shatian Town, the wind direction varies with the seasons; (3) As analyzed using the strong wind samples, the land covers of the two districts basically belong to type A. But based on the data of weather observations, the land cover in Chaiwobao distribution basically belongs to type A, and that in Shatian Town type B. The wind velocity profiles are greatly influenced by wind velocity. That is, the higher the wind velocity, the smaller the wind velocity profile index is; (4) the turbulence intensity of the two districts decreases with altitude. It decreases by nearly one half at 80 m from the land surface. The turbulence intensity of Chaiwobao station attenuates more rapidly than that in Shatian Town, indicating that the turbulence intensity decreases with higher wind velocity. The above findings provide reference for further studies on strong wind characteristics and for the determination of wind load in structural design.