摘要
利用河北省1980-2009年20个气象站的电线积冰观测资料,分析了河北省电线积冰的时空分布特征和不同方位电线积冰的特征。结果表明:河北省电线积冰平原多于山区;年际变化较大,呈减少的趋势;季节变化十分明显,1月份电线积冰日数最多;东西方向和南北方向的电线积冰在最大重量上有一定差别。利用常规观测资料、1°×1°间隔6 h的NCEP资料和2010年1月19-20日黄骅气象站逐时风向风速资料,对一次引起线路舞动的电线积冰天气过程进行了分析。结果表明:这次电线积冰是在地面冷空气与500 hPa、700 hPa低槽共同影响下由雨凇形成的。20日受冷空气影响,黄骅地面气温快速降至0℃附近,而850 hPa温度由零上逐渐转为零下,在对流层低层有逆温层,气温的垂直结构有利于形成雨凇;发生舞动的线路走向与风向夹角较大;舞动发生在较大风速出现之后。
Using wire icing observation data of 20 stations in Hebei province from 1980 to 2009, the spatial and temporal distribution characteristic of wire icing are analyzed. The result shows that wire icing days on plain are more than in mountain, that wire icing days have obvious annual variation and present a descending trend. The wire icing days is obviously different in different seasons and wire icing days are the most in January. Maximum weight of wire icing is different in directions. Using conventional observa-tion data, 1°×1°NCEP data 6 h intervals, and hourly wind of Huanghua from 19 January 2010 to 20 January 2010, a synoptic process causing transmission line galloping is analyzed. The result shows that the wire icing process is caused by glaze on the background of ground cold air and low trough at 500 hPa and 700 hPa. Huanghua surface air temperature quickly dropped to near 0℃ on 20 January 2010 forcold air effect; and the temperature dropped gradually from zero to below zero at 850 hPa; the inversion layer occurs in the lower level of troposphere ; the vertical temperature structure is conducive to the formation of glaze. The intersection angle on galloping wire trend and wind direction is larger ; the galloping occurs after the higher wind speed appears.
出处
《气象与环境科学》
2012年第1期8-13,共6页
Meteorological and Environmental Sciences
基金
河北电力公司科技项目(kj2010-038)资助
关键词
电线积冰
线路舞动
气候特征
雨凇
wire icing
transmission line galloping
climatic characteristic
glaze
