Although glaze turns the earth into fantastic and delicate
scenery that is purely white and glittering with infinite beauty,
but the glaze is a kind of severe weather, hard to remove
and highly destructive, of which the damage must not be ignored.
The scale of the harm that glaze causes is directly related to
the duration of it. From January 15th to 16th, 1957, a glaze
lasted for 30 hours and 9 minutes in Shanghai. The longest glaze
in Beijing was 30 hours and 42 minutes long during the first two
days in March. The longest one in Harbin lasted for 28 hours and
29 minutes from October 18th to 19th in 1956.
In history, the high-voltage lines in many cities
have fallen in a row because of glaze.
The glaze may also be a threat to the air safety
of planes. When a plane flies through the clouds
with over-cooled water droplets, water will accumulate
on the air safety in winter, modern aircraft are
equipped with deicing equipment. When the glaze is
formed on the road, highway transportation is blocked
by the ice on the ground, leading to increasing frequent
traffic accidents. Icing on the ground on the mountain
roads is also dangerous, as it may make easily slide
the car towards the cliff.
The possibility and degree of the disaster caused by
glaze greatly exceed those of rime. In areas of high
latitude area, glaze is a common phenomenon of
disastrous weather. Methods of eliminating the harm
of glaze are mainly manual ice removing when glaze
appears, like letting the residents near the power
transmission line scrape the ice off the line and
take measures to get the trees and power grid supported;
installing deicing equipment on airplanes or simply bypass
around areas of freezing rain, which can mitigate the
devastating effects of glaze.
The longest glaze in China also occurred on Mount Emei. It started
on November 15th and didn’t stop until March 28th, 1970, that
is 3198 hours and 54 minutes. The second longest one is on Mount
Heng, namely Nanyue, lasted from December 24th, 1976 to February
19th, 1977, which is 1,370 hours and 57 minutes.The third longest
one is on Mount Xuefeng in Hunan province, lasting 1,192 hours and
9 minutes from December 25th, 1976 to February 12th, 1977.
As the ice continues to freeze and thicken, it often
breaks off branches, so the glaze will also cause serious
damage to trees. The hard ice layer also rots the crops
that it covers. If the wheat fields freeze, the reviving
winter wheat will get frozen and broken and so will the
seedling planted in the early spring. In addition, the
glaze also destroys a large area of young forest and
frostbites fruit trees. Agriculture, animal husbandry,
transportation and other industries suffer great losses.
Severe freezing rain also collapses houses, endangering
people's lives and property.
In October, 1997, Chengde city, Hebei province, there
was a rare glaze in the Saihanba tree farm from 27th
to 28th October 1977 with affected area of 400,000 mu,
about more than half of the total area of woodland at
that time, making more than 600,000 trees broken. Among
those damaged trees, there were many with broken trunks
and crowns and split and severe bending branches which
were in the severely afflicted area of about 200,000 mu.
The loss is more than 50,000,000 mature trees, as the
damaged area is more than 300,000 cubic meters, equivalent
to the loss of about 960,000 cubic meters of wood, about
27 million yuan to 28 million yuan.
In addition, the biggest harm of glaze is that it breaks off power lines. The
towers of high-tension cables may bear 2 to 3 times of load in
the snow but 10 ~ 20 times when there is glaze. And wires freeze
as a result of the glaze on them and they contract on being cooled.
With the shock that wind brings and the impact of the weight of glaze,
the electricity lines and telephone lines will burden too much to
avoid being broken, in this way poles of thousands of meters to
dozens of kilometers fall in a row, leading to the suspension of
electricity transmission, communication, severe impact on the
local industrial and agricultural production.