Why is the flood season of the Yangtze River longer than that of the Pearl River?

The longest flood season is the Pearl River, because at the southernmost point, the rain belt wanders back and forth twice, and the longest is the Yangtze River, which is 6,300 kilometers.

The Pearl River with the largest flow rate.

The Yangtze River has the widest basin area.

The longest flood season is the Pearl River Because in the southernmost part, the rain belt wanders back and forth twice, and the area of the Pearl River basin is relatively small, but because the Pearl River Basin is in the southern region with the most abundant rainfall in China, the surface water directly enters the river and goes into the river. At the same time, because the section of the Pearl River is much smaller than that of the Yangtze River, the amount of water flowing through the grass is much larger than that of the Yangtze River.

The longest river in China during the flood season --- the Pearl River.

The Pearl River is the third largest river in China after the Yangtze River and the Yellow River. It originally referred to the section of the river from Guangzhou to the mouth of the Dongjiang River, and was later commonly referred to as the water system. The so-called Pearl River Basin now includes the vast basins of the Xijiang, Beijiang, Dongjiang and the Pearl River Delta.

The Pearl River Basin spans six provinces and regions: Yunnan, Guizhou, Guangdong, Guangxi, Jiangxi and Hunan provinces, and the basin is fan-shaped convergence, and the water systems are distributed in the form of dendrites. The total length of the main main tributaries is about 10,000 kilometers, and the total area of the basin is 10,000 square kilometers.

The average annual runoff of the Pearl River basin is 341.2 billion cubic meters, ranking second among the rivers in the country. Among them, the average annual runoff of the Xijiang River is about 267 billion cubic meters, accounting for about 80% of the total basin, the Beijiang River is 47.2 billion cubic meters, and the Dongjiang River is 27.2 billion cubic meters. The Pearl River Basin is the flood season in April and September every year, and it is the longest river in China.

The flow accounts for 70 to 80% of the year, and the floods mostly occur in summer, and there are often large autumn floods in the lower reaches and deltas. The average annual sediment content of the basin is kilogram cubic meters.

The Yangtze River has a flood season once a year, and the Yangtze River flood season is from May to mid-October every year. River runoff during the flood season of the Yangtze River generally accounts for 70%-75% of the annual runoff. The regional distribution of runoff is also very uneven, with water production per unit area to the Jinsha River.

and the Han River water system is the least, Poyang Lake.

and Dongting Lake.

The Yangtze River is the most abundant river in China, with a total water resource of 961.6 billion cubic meters, accounting for about 36% of the country's total river runoff and 20 times that of the Yellow River. The Amazon River is second only to the equatorial rainforest in the world.

and the Congo River (Zaire River), which is in third place. The characteristics of water resources in the Yangtze River are mainly reflected in the spatial and temporal distribution of river runoff, and the surface water resources in the basin account for 99% of the total water resources. River runoff accounts for more than 96% of surface water resources.

<>1. The flood season of the Yangtze River is from May to October.

2. The flood season is the period when the precipitation is the highest in a year, which is easy to cause floods and disasters, so flood prevention should be done well.

3. The flood season refers to the period when the seasonal precipitation, ice melt and snow melt in the river basin cause the regular water level. China's flood season is mainly caused by heavy rains in summer and continuous rain in autumn.

4. From the whole country, the start and end time of the flood season is different, which is mainly determined by the weather and precipitation conditions in various regions. The flood time in the south is earlier and the end time is later; The flood season in the north is late and ends earlier. From May to September of each land eradication year, the rainfall in the Yangtze-Huai River basin is significantly more than that of other months, and it is customary to call this period of time the flood season.

The Yangtze River and the Pearl River are located in the southern monsoon region, close to the sea, and have heavy rainfall.

The Pearl River and the Yangtze River are located in the south, so the Pearl River Basin.

than the Yangtze River and the Yellow River basin.

The rainy season is longer than the Yangtze River and the Yellow River, so the flood season of the Pearl River is also longer than that of the Yangtze River and the Yellow River.

The flood season of the rivers in the eastern monsoon region of China changes from long to short, with the Pearl River entering the flood season in May, the Yangtze River entering the flood season in June, and the Yellow River and Northeast China from July to August.

Rivers enter the flood season; At the end of August, the flood season of the Yellow River and the rivers in Northeast China ended; At the end of September, the flood season on the Pearl River ended.

The Pearl River is the longest river in China, and the Yangtze River has a relatively long flood season. The flood season of the Yellow River is relatively short. The main reason is that the Pearl River and the Yangtze River are located in the southern region of China, which are controlled by the summer monsoon for a long time, the rainy season is long, and the river flood season is long.

The Yellow River is located in the northern part of China, which is affected by the summer monsoon for a short time, and the precipitation is mainly concentrated in July and August, and the flood season of the river is short.

The southern river basin has abundant precipitation and large river volume. The Yellow River Basin in the northern region has less precipitation and less river volume.

Because the rainy season in the area where the Yangtze River and the Pearl River are located is longer than that in the area where the Yellow River is located.

The Yangtze River Basin is an area with abundant precipitation in China, and there are three relatively concentrated periods of rainfall: spring flood season (April to May), summer flood season (June to August) and autumn flood season (August to October).Due to the non-uniformity of the spatial and temporal distribution of annual rainfall, the Yangtze River Basin is more likely to form early floods Floods in the Yangtze River Basin are mainly caused by heavy rainfall, and the time of flood occurrence is basically the same as that of the rainstorm season.

1 is a frontal rain belt, with precipitation from June to July and a flood season in summer.

2. Upstream glacier snow melt There is a flood season in spring.

Mainly in July and August.

During the flood season of the Yangtze River, according to the rainfall pattern of previous years, water from Poyang Lake and Dongting Lake in the month is regarded as "laying the foundation", and the rainy season enters in June, and the water comes from the upper reaches in the rainy season. The upstream covers more than 1 million square kilometers and the flood volume is even greater. It has just started to rain upstream, so the main flood season of the Yangtze River has just arrived.

The earliest record of drought and flood disaster in various areas of the Yangtze River basin is long, and the earliest description of drought was in the fifth year of Emperor Hui of the Han Dynasty (190 BC), "in summer, there was a great drought, the rivers were scarce, and the valleys were extinct" (Hanshu Wuxing Zhi); In the third year of Gaohou (185 BC), "in the summer, the river and the Han water overflowed, and more than 4,000 families were homeless" ("Hanshu Gaohou Ji").

The geographical distribution of drought and flood disasters in the Yangtze River basin is extremely strong, and the occurrence of drought and flood disasters of different degrees varies greatly among different regions. According to the "Atlas of the Distribution of Drought and Flood in China in the Past 500 Years" (1470-1979) edited by the ** Meteorological Bureau (now known as the Institute of Meteorological Sciences of the China Meteorological Administration), the drought and flood series is represented by five levels: grade - waterlogging, grade - partial waterlogging, grade - normal, grade - drought, grade - drought.

The flood season in the middle and upper reaches of the Yangtze River is around July and August every year.