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Plateau Meteorology  2019, Vol. 38 Issue (5): 1091-1098    DOI: 10.7522/j.issn.1000-0534.2018.00141
Cause of the Galloping in Anhui Province along the Yangtze River in Early 2018
WANG Chuanhui1, YAO Yeqing1, XIA Lingzhi2, YAO Zhenhai1, DING Guoxiang1, LUO Yan1
1. Anhui public meteorological service center, Hefei 230031, Anhui, China;
2. State Grid Anhui Electric Power Research Institute, Hefei 230022, Anhui, China
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Abstract  Meteorological elements in the ice coating galloping of power line process in the region along the Yangtze River of southern Anhui in the early 2018 were analysed, as well as the weather situation lead to ice coating and gale, based on the observation data of 5min ground routine meteorological elements, the daily ice coating data of meteorological ice observation stations, the sounding data from Anqing station by 12 h and the ERA-Interim reanalysis data by 6 h. Results show that:There are varying degrees of wire icing near the dancing position, with strong northeastern wind. The angle between the wind direction and dancing wire is generally above 45 degrees, with stronger turbulence. Freezing rain and strong winds are the direct factors leading to the wire dancing. Accompanied by the wire dancing freezing rain is a typical "over cooling warm rain"; The southwest air flow in front of 700 hPa south branch trough, which maintains the existence of the warm layer, brings ample water vapor, as well as warm temperature advection for the freezing rain weather condition; the cold temperature advection by the northeast air flow under the continental cold high pressure of the 925 hPa makes the surface precipitation in the over cooling state. Strong northeastern wind were observed near dancing wire. Strengthen of cold high pressure caused by the accumulation of cold air after the front over northern China is one of the main factors that lead to the strong northeastern wind in the region along the Yangtze River of Anhui.
Key words:  Area along Yangtze River      icing      galloping      power lines      synoptic causes     
Received:  10 August 2018      Published:  17 October 2019
ZTFLH:  P458.3  

Cite this article: 

WANG Chuanhui, YAO Yeqing, XIA Lingzhi, YAO Zhenhai, DING Guoxiang, LUO Yan. Cause of the Galloping in Anhui Province along the Yangtze River in Early 2018. Plateau Meteorology, 2019, 38(5): 1091-1098.

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