拉萨城市近地层风环境特征初步分析  

Lhasa City Surface Layer Wind Environmental Characteristics of the Preliminary Analysis

作　　者：次旺 卓玛[1] 

机构地区：[1]西藏自治区气候中心,西藏拉萨

出　　处：《气候变化研究快报》2017年第2期63-67,共5页Climate Change Research Letters

摘　　要：本文选取拉萨市1981~2010年逐日风速、风向地面观测资料,统计分析近30a拉萨城区近地层风环境特征表明:拉萨市区的风环境具有明显的日变化特征。全年风速变化呈单峰型,最大平均风速出现在3、4月份,风速为2.2 m/s,最小风速出现在10、11、12月,均为1.4 m/s。拉萨的城区主导风是东风其次是东南偏东风(ESE),夏季稍有不同,呈现出西北偏西风向。历年大风灾害主要以沙尘、扬沙和浮尘为主,其中拉萨市区的浮尘天气最多,市区内造成灾害的主要为瞬时大风。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.

关 键 词：拉萨 近地层 风环境 特征 

分 类 号：P4[天文地球—大气科学及气象学]