How to determine the date of flood season?

According to the method of determining the flood season date in China, the flood season date refers to the start date of the flood season in that year. The flood season entry standard starts from March 1 every year. When the flood season entry index meets one of the following conditions, it can be determined as the flood season entry date, that is, the coverage area of the rain area with accumulated rainfall of more than 50 mm for three consecutive days reaches 1.5 million square kilometers; Any representative station entering the flood season exceeds the warning water level (if the warning water level of the representative station changes, the latest index will be adopted).

"Flood season" is the appearance of abundant water, and "flood season" is the period when rivers are full of water. Flood season does not mean flood, and floods are generally in flood season. The floods in rivers and lakes are obviously concentrated in one year, which is easy to form a period of frequent floods. Due to the different geographical location and flood season, the length and time sequence of flood season are also different.

Extended data

Flood season in different periods in China

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.

Flood season refers to the period when the water level rises regularly due to seasonal precipitation and melting ice and snow in the basin. 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. From May to September every year, the rainfall in the Jianghuai basin is obviously more than that in other months, which is customarily called the flood season.

Baidu encyclopedia-flood season

Baidu Encyclopedia-Method for Determining the Date of Flood Season in China