金沙江下游局地大气边界层风场变化特征  

Variation Features of Wind Fields in Atmospheric Boundary Layer over the Lower Reaches of Jinsha River

作　　者：秦剑[1] 赵刚[1] 陈艳 綦正信[1] 朱保林[1] 刘瑜[3] 

机构地区：[1]云南省气象局,昆明650034 [2]四川省凉山彝族自治州气象局,西昌615000 [3]云南省气候中心,昆明650034

出　　处：《气象》2013年第6期749-758,共10页Meteorological Monthly

基　　金：中国长江三峡集团公司2008年<溪洛渡水电站坝区及向家坝水电站库区局地气候环境本底监测与分析>[JS(07)064]项目资助

摘　　要：利用2008年在金沙江下游溪洛渡水电站坝区及向家坝水电站库区获得GPS低空探空资料以及同步地面观测资料,统计分析了坝区从地面开始到大气边界层2000 m高度四季不同高度的风场变化特征。结果表明:(1)春季溪洛渡坝区大气边界层以偏西风为主导风向,1 500 m高度层以下静风和小风出现频率大,是四个季节中地面静风、小风出现频率的最大值;(2)夏季地面静风、小风出现频率为四个季节中最小,夏季大气边界层中低层主要盛行西风和西北偏西风;(3)秋季溪洛渡坝区大气边界层中低层主要盛行偏西风,到高层则逐渐转变为偏北风;(4)冬季溪洛渡坝区大气边界层低空盛行以西风和西北偏西风为主导的偏西风;中高层主要风向是西风、西南偏西风、东风和东北偏东风:(5)溪洛渡坝区秋、冬季大气边界层西风、东北偏北风、东北偏东风风速最大值均出现在2000 m高度层。Using the GPS low-level sounding data obtained in the dam area of Xiluodu Hydropower Station and the reservoir area of Xiangjiaba Hydropower Station in the lower reaches of Jinsha River as well as the synchronous surface observation data, this paper analyzes the variation characteristics of the wind fields in different heights from surface to the 2000 m height of atmospheric boundary layer in spring, summer, au tumn and winter. The results indicate that： （1） in spring westerly winds blow in the atmospheric bounda- ry layer over Xiluodu Dam Area mainly while under the height of 1500 m calm and light winds appear more frequently, reaching the maximum values of surface calm and light winds in the four seasons; （2） in sum- mer the occurrence of surface calm and light winds is the least in the four seasons, and west winds and northwest-west winds prevail in the middle and lower levels of atmospheric boundary layer; （3） in autumn westerly winds are the major theme in the middle and lower levels over Xiluodu Dam Area but turn to northerly winds gradually in the upper level; （4） in winter wersterlies dominated by west and northwest- west winds prevail in the low level whilst in the middle and high levels the directions of winds becomewest, southwest-west, east and northeast-east; （5） in autumn and winter the maximum wind speeds of west, northeast-north, northeast-east in the atmosphere boundary layer over Xiluodu Dam Area all appear in the high level of 2000 m.

关 键 词：溪洛渡坝区 向家坝库区 大气边界层 水电站 GPS探空 风场变化特征 

分 类 号：P463[天文地球—大气科学及气象学]