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ISSN 1006-9585

CN 11-3693/P

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中国冻雨的时空分布特征及其对特高压输电线路的影响
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中国电力科学研究院有限公司

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基金项目:

国家重点研发计划2018YFC0809400、2018YFA0606004,国家电网公司科技项目5200-202016243A-0-0-00(电网密集输电通道多时空尺度电力气象灾害预报预警技术研究),国家自然科学基金–智能电网联合基金U1966601。


Spatio-Temporal Characteristics of Freezing Rain in China and Its Impact on Ultra-High Voltage Transmission Lines
Author:
Affiliation:

China Electric Power Research Institute

Fund Project:

National Key Research and Development Project (Grants 2018YFC0809400 and 2018YFA0606004), the State Grid Co., Ltd. Science and Technology Project (Grant 5200-202016243A-0-0-00, Research on Multi-temporal and Spatial Scale Power Meteorological Disaster Forecast and Warning Technology), the Joint Research Fund in Smart Grid (Grant U1966601) under cooperative agreement between the National Natural Science Foundation of China (NSFC) and State Grid Corporation of China(SGCC).

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    摘要:

    冻雨的时空分布信息对于电力、交通、通信、农林等部门具有较高的实用价值。此前,关于冻雨的研究多基于观测资料,受限于资料长度较短、分布不均与部分缺失,对我国冻雨的时空分布特征可能认识不足。新一代ERA5再分析资料中包含了其他再分析资料所未提供的冻雨资料,为进一步认识我国冻雨时空分布特征提供了可能。本文使用ERA5冻雨资料分析了1979-2020年我国年冻雨日数和年冻雨量的年均特征、年代际特征及EOF模态的时空分布特征,结果表明:我国年均冻雨日数和年均冻雨量最多的地区集中在贵州、湖南等地,直接影响7条“西电东送”特高压直流输电线路,影响长度总计约4900公里;集中分布地区的年冻雨日数及年冻雨量均呈下降趋势;年冻雨日数EOF模态1(方差贡献36.96%)主要分布在黑河-腾冲线以东,总体呈下降趋势,且以秦岭-淮河线为界呈南北反相分布;年冻雨日数EOF模态2(方差贡献11.56%)反映出南方冻雨集中地区的2个局地反相分布区,位相交替周期为2至4年;年冻雨量EOF模态的时空特征同年冻雨日数类似。

    Abstract:

    The spatio-temporal distribution information of freezing rain has high practical value for the electric power, transportation, communications, agriculture and forestry sectors. Previous research was mostly based on observational data, limited by the short length of the data, uneven distribution and partial lack, there may be insufficient understanding. The new-generation ERA5 reanalysis data contains freezing rain data not provided by other reanalysis data, which provides the possibility to further understand the spatio-temporal distribution in China. This paper uses ERA5 freezing rain data to analyze the annual average and interdecadal characteristics of China’s annual freezing rain days and annual freezing rainfall from 1979 to 2020. The spatio-temporal distribution characteristics of the EOF modes are also studied. The results show that China’s annual average freezing rain days and annual average freezing rainfall are most concentrated in Guizhou, Hunan, et al., directly affecting 7 ‘West-to-East’ ultra-high voltage (UHV) direct-current (DC) transmission lines, with a total length of about 4900 kilometers; The number of annual freezing rain days and annual freezing rainfall in concentrated areas are decreasing; As for EOF mode 1 (variance contribution 36.96%) of the number of freezing rain days, it is mainly distributed to the east of the Heihe-Tengchong line, and the overall trend is decreasing, and with the Qinling-Huaihe line as the boundary, there is a north-south reverse distribution; EOF mode 2 (variance contribution 11.56%) of the number of freezing rain days reflects two anti-phase regions in the southern freezing rain concentrated area, and the phase alternate period is 2 to 4 years; The EOF mode distribution of the annual freezing rainfall are similar to the annual number of freezing rain days.

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  • 收稿日期:2021-03-08
  • 最后修改日期:2021-05-27
  • 录用日期:2021-07-27
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