The seasonal and periodic flood period of rivers is called flood season, among which the most harmful is

The seasonal and periodic flood season of rivers is called flood season, among which peach flood season and flood season are the most harmful.

Flood season refers to the period in a year when the river water level rises regularly and significantly due to seasonal rainfall, melting ice and snow. Rainfall or melting snow in the basin will cause the river to rise sharply. In spring, the climate gets warmer, seasonal snow melts, river ice melts or spring rain causes the river to rise, which is called spring flood.

In northern China, the phenomenon that river flow is blocked by ice in winter and spring is called ice flood. In summer, the torrential rain in the basin or the melting of snow in alpine glaciers make the river rise sharply, which is called summer flood. People are used to calling the floods around the dog days in summer the flood season. In autumn, due to heavy rain, the river surges, which is called autumn flood season.

Due to the different geographical location and weather system, the flood season of the seven rivers in China is different in the morning and evening. According to the analysis of rainfall and flood occurrence regularity and meteorological causes, the flood season can be roughly divided into: Pearl River: April-September, Yangtze River: 5- 10, Huaihe River: June-September, Yellow River: 6- 10, Haihe River: June-September, Liaohe River: June-September and Songhua River: June-September.

The flood season in China is mainly heavy rain in summer and continuous rain in autumn. Nationwide, the start and end time of flood season is different, which is mainly determined by the climate and precipitation in different regions. South China entered the flood season earlier and ended later; The flood season in northern China entered late and ended early. The flood season is the period with the largest precipitation in a year, which is easy to cause floods, so it is necessary to do a good job in flood control.