Is Jilin Rime Island an island? What are the conditions and reasons for the formation of rime?
When it comes to the rime scenery in winter, the first thing that everyone thinks of is Jilin Rime Island. It is one of the best places to watch the rime scenery in my country and has many loyal fans. But there are also many friends who are very curious and ask, is Jilin Rime Island an island? How did the rime on this island form? How was Jilin Rime Island formed?
Songhua River + Fengman Hydropower Station in the upper reaches of Songhua River
1. Natural conditions
In Jilin, every winter, although Songhua River The lake is as bright as a mirror and as frozen as iron, but the water tens of meters deep under the ice can still maintain a water temperature of 4°C. The difference between the water temperature and the ground temperature is often about 30°C, thus forming a situation where it is not frozen for dozens of miles below the urban area. of the river. The temperature difference causes the river to produce fog, and white mist curls up on the river surface and does not dissipate for a long time.
On the ten-mile long embankment along the river, there are pine trees and willows caressing the river. Under the influence of certain air pressure, wind direction, temperature and other conditions, a large amount of fog on the river surface condenses in the form of frost when it gets cold. The surrounding branches of different thicknesses form a large area of rime spectacle.
Due to the unique natural conditions, Jilin rime has the characteristics of long duration, large thickness and high frequency of occurrence.
2. Man-made conditions
The temperature in Jilin in winter is below -20°C for up to sixty or seventy days. What is amazing is that the Songhua River that passes through the city can actually It also flows continuously in the severe cold of winter. It turns out that fifteen kilometers upstream from Jilin City is the famous Fengman Hydropower Station.
The hydropower station dam cut off the river water, forming a huge artificial lake - Songhua Lake. The water volume of nearly 10 billion cubic meters makes the surface of Songhua Lake freeze in winter, but the temperature under the water is still remains above 0°C.
In particular, the temperature of the lake water has increased after passing through the hydropower station generator set. The river water carries huge thermal energy down the river, thus forming a unique landscape of tens of kilometers of river surface that is cold and not frozen. It also has The two necessary and contradictory natural conditions for the formation of rime: sufficient low temperature and sufficient water vapor. Is Wusong Island an island?
Rime Island is a small island naturally formed on the Songhua River. The reason why the river does not freeze all year round is because there is a full-fledged dam in its upper reaches that intercepts the upper reaches of the river into a reservoir. This Manman Dam is a concrete gravity dam with a length of 1,080 meters and a height of 91.7 meters. It was built in 1937 during the Japanese puppet period and was the tallest dam in Asia at the time.
The winter in Jilin is very cold, and the high water level in the reservoir can well retain the heat of the river water. The temperature difference between the river water flowing out of the reservoir and the climate environment makes the river surface of Rime Island adjacent to the reservoir Transpiration of water mist is formed on the ground, which is the basic condition for the formation of rime. The history of the formation of Wusong Island
The Fengman Dam was built by hundreds of thousands of Chinese workers under the crazy enslavement of the Japanese invaders. In addition to dying of exhaustion, disease, and torture, the remaining workers were deceived into During the "final completion inspection" in the tunnel, they were drowned alive, and there were not many workers left to participate in the construction of the dam. Guide to viewing Rime Island
The best viewing period for Jilin Rime is from December every year to February of the following year. The best time to see the rime is in the morning. The time when the rime disappears depends on the wind strength that day. If the wind is strong, the rime will start to fall around 9 o'clock. If there is no wind or light wind, the rime can last until 11-12 o'clock.