Abstract:
This paper selects the ground observation data about the daily wind speed and direction in Lhasa to analyze the characters of the boundary layer wind nearly 30 years from 1981 to 2010. The paper shows that the wind environment in Lhasa has the typical diurnal changes. The wind speed of the whole year is unimodal type. The maximum speed is 2.2 m/s in March and April and the minimum speed is 1.4 m/s in October, November and December. The main wind is East and ESE in urban area of Lhasa. When in summer, it’s different from others. It’s often WNW. The cal-endar year wind disasters are mainly composed of dust, sand blowing and floating dust in urban area of Lhasa, the most is floating dust. The instantaneous wind causes disasters in the main urban area.