What is the diameter of rime ice?

From 1954 to 12 to 1955+0 10, a snowstorm occurred in the plain of Dongting Lake area, Hubei Province, with an accumulated ice thickness of 70 ~ 80 mm. In Hunan power grid with an altitude of 150 ~ 600 m, the maximum thickness of conductor icing is 70 ~ 80 mm, which is rare in history. From February 13 to February 16, 2005, three lines of Hunan 500kV power grid were disconnected due to icing. 1969 A severe freezing rain in northern Guangdong interrupted telecommunication traffic in northern Guangdong, and industrial and mining enterprises stopped working for more than a week. 1972 February/kloc-0 ~ 8, large-scale freezing rain occurred in Hunan, Guizhou, Jiangxi and other places, and the wires in the most serious areas were frozen nearly 10 cm thick. Make telegrams and telephones unusable. 197365438+February, Xinjiang province? The maximum diameter of primary snow in Qitai County is 24 cm, the thickness is 18 cm, and the weight per meter is 224 grams. The primary snow in Jimunai lasts for 60 hours, and the maximum diameter is 7 cm, which breaks the wires and causes communication interruption. The overhead communication line from Urumqi to Tacheng often needs to organize manpower to break the ice every winter to ensure the normal communication. 1October 27 -28,1977 10 A rare snowstorm occurred in Hansaiba Forest Farm, Chengde City, Hebei Province, with an affected area of 400,000 mu, accounting for more than half of the forest area at that time, causing more than 600,000 trees to be damaged, and the severely affected area was 200,000 mu. The loss of wood is about 960,000 cubic meters, which is about 27-28 million yuan.