What is the principle of the appearance of the vortex landscape of the Yellow River?

Recently, with the sudden drop of temperature, a cold wave struck. At the end of the Yellow River in Lijin County, Dongying City, the Yellow River water is mixed with a lot of white and sharp ice, which flows eastward, and the ice chips are staggered. The pieces of ice shine in the sun, and the river is white, forming a spectacle of swirling ice. Wild ducks gather by the river, playing and flying, harmonious and full of vitality. It is reported that the mountainside on the bank of the Yellow River is also covered with different forms of ice waterfalls, and nature is ingenious, depicting a magnificent winter scene of the Yellow River. So what is the principle of this natural wonder?

In a river basin with an ice age, ice will flow with the river, which is called flowing ice. Generally speaking, ice flow occurs twice a year, once before the river freezes and once when the river thaws. Therefore, the ice flow can be divided into two types: winter ice flow and spring ice discharge. The winter ice flow is mainly ice flowers and ice deposits, and the spring ice flow is mainly broken ice. The current ice flow of the Yellow River refers to the ice flow before freezing.

The ice jam period of the Yellow River generally begins 1-2 days after the formation of shore ice or Frazier ice. The date of ice flow is not fixed, and the starting date depends on the local temperature of the year. Because of the zonality of temperature, the temperature in high latitudes is lower than that in low latitudes, so the river in high latitudes flows earlier. Of course, latitude is not the only factor that determines the ice jam period, but also related to the river course. If the direction of the whole river is the same, then the start date of ice jam in all parts of the river is roughly the same. The length of ice jam period is related to temperature, river flow and other factors, but temperature is still the main factor determining ice jam period. For example, the ice jam period in the lower Yellow River is generally about 10 day, but the shortest ice jam period is 1 day and the longest is 60 days.

On June 5438+1October 5, 2020, a large area of flowing landscape also appeared in the lower reaches of the Shanxi section of the Yellow River. After the New Year's Day that year, the temperature in Shanxi continued to fall, and there was a large range of rain and snow, so there was a flowing landscape. Large and small ice flowed down the river and filled the river. The scene is spectacular, and Hukou of the Yellow River is very famous in the local area. Snow stream, snow bridge? Statement.

Although the scenery in Liu Ling is beautiful, it will bring many disasters to Ling Bing every year. When the ice is frozen, the ice floes are thin, the temperature is low, and the river freezes quickly, which is not enough to cause harm. However, when it melts, it has fast flow rate, large flow rate and large volume, which is easy to cause blockage and overflow into the river, and the water level is greatly improved, eventually leading to flooding or breach of the dam. Ice flood may occur during the interception period in winter and the river opening period in spring. Therefore, during the annual ice flood, preventive measures will be taken along the Yellow River to ensure the smooth passage of ice flood.