摘要
利用长江三峡工程生态与环境监测网络—局地气候监测子系统中的三峡库区重庆涪陵睦和100 m测风塔5个高度(10、30、50、70、100 m)2010—2018年逐时观测资料,分析了局地风垂直变化特征。结果表明:垂直风速在季节分布上春季最大,冬季最小;其日变化为单峰型,于09时和16时左右分别达到最小和最大值;夏季10—13时30~100 m高度平均风速大小几乎相同;局地风向主要受当地地形影响,各高度沿长江河谷走向(SSW~ENE)的风向频率在46%~66%。当有降雨天气时,风速垂直差异从大到小分别为暴雨、大雨、中雨、小雨。在降雨天气,随着温度升高,风速垂直梯度变化增加。夜间出现逆温现象时,50 m高度的风速小于30 m。
Using the hourly data of five heights(10,30,50,70,and 100 m)observed by the 100-meter wind tower at Muhe in the Fuling district,Chongqing in the Three Gorges Reservoir area,belonging to the local climate monitoring subsystem in ecology and environment monitoring network of the Yangtze River Three Gorges project,from 2010 to 2020,the characteristics of vertical change of local wind were analyzed.The results show that the wind speed at the same height is the biggest in spring and the smallest in winter,and shows a typical diurnal variation of the single peak type,reaching a bottom at about 9 o′clock and a peak at about 16 o′clock.The wind speed at 30~100 m height is almost the same during 10-13 o′clock in summer.The local wind direction is mainly influenced by the local terrain.The frequency of local wind direction along(SSW~ENE)the Yangtze River Valley at different heights ranges between 46%and 66%.When there is rainfall,the vertical difference of wind speed with the order from large to small is torrential rain,heavy rain,moderate rain,and light rain,respectively,and the vertical gradient of wind speed increases with the temperature increasing.When there is temperature inversion at night,the wind speed at 50 m height is smaller than that at 30 m height.
作者
郭渠
王勇
李瑞
张天宇
胡祖恒
张芬
GUO Qu;WANG Yong;LI Rui;ZHANG Tian-yu;HU Zu-heng;ZHANG Fen(Chongqing Climate Center,Chongqing 401147,China;Ji′nan Meteorological Service,Ji′nan 250002,China)
出处
《气象与环境学报》
2023年第3期97-105,共9页
Journal of Meteorology and Environment
基金
国家自然科学基金项目(41875111)
重庆市气象部门业务技术攻关项目(YWJSGG-202305)共同资助。
关键词
局地风
垂直变化
三峡库区
Local wind
Vertical difference
the Three Gorges Reservoir area
