The most spectacular ice phenomenon of the Yellow River, which other river has appeared in the world?

There is an ice wonder in Yuqiao Reservoir in Tianjin, and the ice landscape of Sailimu Lake is upside down. The ice in the Yellow River and the Yellow River basin spans 23 longitudes from east to west, and the north and south are separated by 10 latitude. There are great differences in topography and landforms, and the runoff changes greatly. Affected by cold air from Siberia and Mongolia in winter and spring, there are more northerly winds, dry and cold climate and less rain and snow. The distribution of winter temperature in the basin is: low in the west and low in the east, low in the north and low in the south, and lower in the mountainous area than in the plain. The average temperature in January is below 0 degrees Celsius. Annual extreme minimum temperature: -25~-52.3℃ in upstream, -20 ~-40℃ in midstream and-15 ~-23℃ in downstream. Therefore, the main stream and tributaries of the Yellow River have different degrees of icing in winter. These ice conditions not only have a direct impact on water transportation, water supply, power generation and hydraulic structures in winter, but also lead to flooding in Hong Ling, especially after special ice conditions such as ice jam and ice dam appear in rivers.

Because of the different topography, the river type and water quantity change differently. Therefore, not all rivers will have the above ice evolution process. For example, in the lower reaches of the Yellow River, there are frequent cold air activities in some years, and the fluctuation range is also large at 0℃, and there can be many freezing and thawing processes in one winter. Another example is some sections of the upper reaches of the Yellow River and some rivers in Xinjiang, where the rivers are steep and fast-flowing, and only ice flows in winter without freezing.

A hydrological phenomenon in which the water level of a river rises obviously due to the resistance of ice to water flow. Ice sometimes converges into an integrated ice plug or dam, which leads to a sharp rise in water level and eventually floods the beach or bursts its banks. This is the so-called Hong Ling. Ice flood may occur during the interception period in winter and the river opening period in spring. Large rivers in northern China, such as the Yellow River, Heilongjiang and Songhua River, are prone to ice flood. The natural conditions of ice flood depend on the geographical location and channel shape of the river. In the alpine region, the river flows from low latitude to high latitude, and the shape of the river channel is wide and narrow, so there are more opportunities for serious ice flood where the river channel bends into a ring. This is because the lower section of the river freezes earlier than the upper section, and the upper section thaws earlier than the lower section. And the thickness of the ice sheet is thicker in the lower section and thinner in the upper section. When there is ice in the lower reaches of the river, part of the upstream water flow is blocked, which increases the water storage capacity of the river. When the ice melts to open the river, the water storage capacity of this river is released sharply, and the Ling Feng descends, and the ice water gathers more and more along the way, and the ice peak increases. When the ice water from the upstream spreads downstream, it will get stuck in a narrow reach or where the river turns, forming an ice dam, thus increasing the water level in the upstream. The severity of ice flood depends on the influence of river ice on water level. Usually, the water level will rise sharply only after serious ice or ice dam appears in the river, causing serious ice flood.