摘要
利用山西省18个积冰站电线积冰观测资料和91个气象站常规观测资料,采用逐步回归分析方法,针对不同气候区分别构建电线覆冰设计冰厚的气象估算模型,推算各站30 a、50 a、100 a重现期下的设计冰厚。在此基础上,结合DEM数据和电网运行覆冰观测资料,对设计冰厚进行地形订正和易冰区微地形运行经验修正,最终得到山西省电网电线覆冰厚度空间分布及区划结果。结果表明:(1)山西省电线覆冰的设计冰厚整体与气温、相对湿度、风速、水汽压等密切相关,其中高山区的设计冰厚还与降水量、日照时数关系密切,且受连续3 d的气象条件影响,而丘陵和平原区则与当日和前一日或前二日的气象条件密切相关;(2)构建的分区设计冰厚气象估算模型对各气候区的覆冰厚度模拟效果较好,估算偏差五台山前约2 mm,其余地区小于1.2 mm;(3)地形订正后的结果更为合理地反映山西省各重现期下电线覆冰厚度的空间特征,即覆冰厚度随纬度降低而减小,中、重冰区主要分布在恒山、五台山、管涔山、吕梁山、太岳山和太行山等高海拔地区,而沿黄河一带和盆地为轻冰区,且盆地覆冰最轻;(4)易覆冰区经运行经验修正后,其覆冰厚度能够更加精确表达局部微地形区覆冰真实情况,这对电力部门具有实际参考价值。
Based on wire icing observation data at 18 icing meteorological stations and conventional meteorological observation data at 91 meteorological stations of Shanxi Province, the meteorological estimation model of designed wire icing thickness was built by using stepwise regression analysis in different climatic regions, respectively. Then, the designed wire icing thickness at each station under 30-year, 50-year and 100-year return periods was estimated by regression models. And on this basis, combined with DEM data and wire icing observation data in the process of power grid operation and maintenance, the designed wire icing thickness was corrected by terrain, and it in easily icing areas was modified according to operating experience of power grid, the spatial distribution and division of wire icing thickness were obtained in Shanxi Province. The results are as follows:(1) The designed wire icing thickness in Shanxi Province was closely related to air temperature, relative humidity, wind speed and water vapor pressure, it was also related to precipitation and sunshine duration in alpine region, and the influence of meteorological conditions on continuous previous three days on icing thickness was obvious, while that in hilly and plain region was closely related to meteorological conditions on the day and previous day or two days.(2) The regional meteorological estimation model had a good effect on simulating wire icing thickness in each region of Shanxi Province, and the deviation was about 2 mm at Wutai Mountain station before the relocating, while that was less than 1.2 mm in other areas.(3) The results after the terrain correction could perform more reasonably the spatial distribution characteristics of wire icing thickness under different return periods in Shanxi Province. The wire icing thickness decreased with the decrease of latitude, the medium and heavy icing thickness mainly distributed in high elevation areas of Hengshan, Wutai, Guancen, Lvliang, Taiyue and Taihang Mountains, while the icing thickness w
作者
李清华
孟洁
李劲松
刘月丽
常清
姜敏
郭栋
LI Qinghua;MENG Jie;LI Jinsong;LIU Yueli;CHANG Qing;JIANG Min;GUO Dong(Shanxi Meteorological Service Center,Taiyuan 030002,China;State Grid Shanxi Electric Power Research Institute,Taiyuan 030001,China;Shanxi Climate Center,Taiyuan 030006,China)
出处
《干旱气象》
2022年第1期156-165,共10页
Journal of Arid Meteorology
基金
山西省气象局重点科研项目(SXKZDFW20195604)
山西省智慧气象服务创新团队共同资助。
关键词
电线覆冰
设计冰厚
重现期
空间分布及区划
山西省
wire icing
designed wire icing thickness
return period
spatial distribution and division
Shanxi Province
