Is Jimo Island in Jilin an island? Conditions and causes of rime formation

When it comes to the rime scenery in winter, the first thing that comes to mind is Jimi Island in Jilin, which is one of the scenic spots where China sees the rime wonders and has many loyal fans. But many friends suspect that Wusong Island in Jilin is an island. How did the rime form on this island?

How did Jimmy Island in Jilin come into being?

Fengman hydropower station in the upper reaches of Songhua River

1. Natural conditions

In Jilin, in winter, although Songhua Lake is like a mirror and frozen as iron, it can still maintain a water temperature of 4 in the water dozens of meters deep under the ice, and the temperature difference between the water temperature and the ground is often around 30, thus forming an unfrozen river surface dozens of miles below the urban area. The temperature difference makes the river foggy, and the white fog on the river persists for a long time.

Liu Song Chengxing Yangtze River Shili Dike. Under certain air pressure, wind direction, temperature and other conditions, a large amount of fog on the river surface condenses on the surrounding branches with different thicknesses in the form of frost, forming a large area of rime wonders.

Because of its unique natural conditions, Jilin rime has the characteristics of long duration, large thickness and high frequency.

2. The human condition

The winter in Jilin is MINUS 20 degrees for sixty or seventy days. It is amazing that the Songhua River, which runs through the city, can continue to flow in the cold winter. It turns out that fifteen kilometers upstream of Jilin City is the famous Fengman Hydropower Station.

The dam cut off the river and formed a huge artificial lake, Songhua Lake. Nearly 654.38 billion cubic meters of water has frozen the surface of Songhua Lake in winter, but the underwater temperature has remained at 0.

In particular, the temperature of the lake water rises after passing through the generator set of the hydropower station, and the river water flows downstream with huge heat energy, forming a strange landscape on the icy river surface for dozens of kilometers. At the same time, there are two necessary and contradictory natural conditions for the formation of rime: sufficient low temperature and sufficient water vapor.

Is rime island an island?

Rime island is a naturally formed island on the Songhua River. The reason why this river is not frozen all the year round is that there is a plump dam in the upper reaches that cuts the upper reaches into reservoirs. The plump dam is a concrete gravity dam, with a length of1080m and a height of 91.7m. It was built in 1937 during the Japanese-Puppet War and was the highest dam in Asia at that time.

Jilin is very cold in winter, and the high water level of the reservoir can well retain the heat of the river. The temperature difference between the river water flowing out of the reservoir and the climate environment makes transpiration water mist form on the rime island near the reservoir, which is the basic condition for the formation of rime.

The formation history of rime island.

Plump dam was built by hundreds of thousands of workers in China under the crazy slavery of Japanese invaders. The remaining workers, except those who were exhausted, terminally ill and tortured to death, were tricked into the tunnel for "final completion acceptance" and drowned alive. There are few workers left to participate in the dam construction.

20 10-20 10 The best viewing period of Jilin rime is 12 to February of the following year. The best time to watch the rime is in the morning, and the time when the rime disappears depends on the wind of the day. If the wind is strong, the rime will start to fall around 9 o'clock. If there is no wind or breeze, the rime can last until 1 1- 12.