Which is the river that has been flooded frequently in the history of our country?

Yellow River. Most of the floods in the upper reaches of the Yellow River occurred in September, mainly from above Lanzhou, and the floods in Lanzhou mainly came from above Guide. Due to the long duration and low intensity of rainfall, coupled with the good vegetation above Lanzhou, the grassland and swamp have a strong effect on rainfall, resulting in a gentle flood rise and fall in the upper reaches of the Yellow River, with a long flood duration, low flood peak, and a short and fat flood process line.

A flood at Lanzhou station lasts an average of 40 days, the longest is 66 days, and the shortest is 22 days, and the measured peak flood flow is generally 4000 6000 cubic meters per second.

The peak flood flow of the section from Longyang Gorge to Lanzhou River generally increases along the way, especially after the confluence of large tributaries such as Tao River and Huangshui, the flow increases significantly. However, from Lanzhou to Hekou Town in the Inner Mongolia Autonomous Region, because the Yellow River flows through the driest areas in the basin, the average annual precipitation is only 150,300 mm, and there is very little water added during the flood season, and there are not many opportunities to encounter floods above Lanzhou.

The upper reaches of the Yellow River are mostly canyon sections, regardless of the size of the flood, the general propagation time changes little, it takes about a few days from Guide to Lanzhou, and about a day from Lanzhou to Hekou Town. The flood in the upper reaches of the Yellow River and reaches the middle and lower reaches, which generally become the base flow.

The actual flood data of the upper reaches of the Yellow River began after the flood in 1933, when hydrological stations were set up in Lanzhou, Baotou and other places. The largest flood measured occurred in 1946, with a peak flow of 5,900 cubic meters per second at Lanzhou Station and a total flood of 6.5 billion cubic meters in 15 days. In the 1981 flood, although the peak flow of Lanzhou Station was only 5,600 cubic meters per second, without the construction of the cofferdam of Longyangxia Reservoir and the storage of Liujiaxia Reservoir, the peak flow of Lanzhou Station could reach 7,090 cubic meters per second.

According to the survey, the largest historical flood in the upstream area occurred in 1904, and the peak flood flow of Lanzhou station reached 8,600 cubic meters per second.

1) The seasonal distribution of water resources in China is unbalanced, and the inter-annual variation is large, so it is necessary to build reservoirs, store water during flood seasons, and release water during dry seasons to adjust the river water volume in each season; (2) After the founding of the People's Republic of China, China has built a large number of reservoirs to regulate water volume, improve flood control and drought resistance, and expand the irrigation area, and play a comprehensive utilization role in flood control, power generation, shipping, aquaculture, water supply, irrigation and tourism; (3) Water resources are an indispensable part of people's agriculture, industry, and life The construction of water conservancy projects can adjust the temporal and spatial distribution of water resources to a considerable extent However, with the growth of population, the advancement of urbanization, and the development of industry and agriculture, the contradiction between supply and demand of water resources in China is still very serious More than half of China's cities are short of water, and water pollution will make this problem more prominent Some cities in the humid areas of the south have also become water-scarce cities due to water pollution, so the answer is: (1) time; (2) flood control and power generation; (3) Water resources are an indispensable part of people's agriculture, industry and life

Summary. Generally speaking, the most flood-prone period for China's major rivers is from May to September, with June and July as the peak period.

Specifically, the southern rivers are most prone to flooding from May to July, while the northern rivers are from July to September. Generally speaking, the most prone period for floods in China's major rivers is from May to July every year, of which May is the peak period for floods.

The following months of the year are the most flood-prone periods in China's major riversA: Generally speaking, the most flood-prone period in China's major rivers is from May to September, with June and July as the peak period. Specifically, the southern rivers are most likely to flood from May to July, while the northern rivers are from July to September.

Hello and dear as follows: The months of each year are the most flood-prone periods in China's major riversA: Generally speaking, the most flood-prone period of China's major rivers is from May to September, with June and July as the peak period. Specifically, the southern rivers are most prone to flooding from May to July, while the northern rivers are prepared from July to September.

Generally speaking, the most tolerant and flood-prone period of China's major rivers is from May to July every year, of which May is the peak period of flooding.

During the 2096 years from 185 BC (the beginning of the Western Han Dynasty) to 1911 (the end of the Qing Dynasty), the Yangtze River experienced a total of major floods. (about 2000 years ago) flooded China, Dayu controlled the water.

Shangshu) 2, Xia Dynasty? (Before 1600 BC) the Shang Marquis died in the river, and died in the water.

Chinese) 3. In the fifth year of King Zhou Ding (602 BC), the Yellow River was diverted for the first time.

Hanshu Gou Xun Zhi) 4, Lu Chenggong five years (586 years ago) Jinliang landslide, the river did not flow for three days.

Spring and Autumn Three Legends) 5, in the twentieth year of the Jin Dynasty (453 years ago), the river was decided by Hu.

Ancient book "Bamboo Book Chronicle") 6, in the twelfth year of King Liang Huicheng (359 BC), the Chu master went out of the river to water outside the wall.

Ancient book "Bamboo Book Chronicle") 7, in the tenth year of King Xiang of Wei (309 years ago), the river overflowed with sour jujubes.

Ancient book "Bamboo Book Chronicle") 8, Qin Shi Huang 22 years (225 years ago) Wang Ben attacked Wei Yinhe irrigation Liang, damaged its city, Wei surrendered.

Shi Ji Shi Huang Ben Ji) 9, in the autumn of the fourth year after the Han Lu Dynasty (184 years ago), Henan was flooded, and there were more than 1,600 Yiluo flows.

Hanshu Five Elements Chronicles) 10, in the twelfth year of Emperor Wen of the Han Dynasty (168 years ago), the river broke the sour jujube, and the golden embankment collapsed in the east.

Hanshu Gou Xun Zhi) 11, the seventeenth year of Emperor Wen of the Han Dynasty (163 years ago) the river overflowed through Si.

12. In the spring of the third year of Emperor Wu's founding (138 years ago), the river overflowed in the plain, and there was a great hunger and cannibalism.

Hanshu Wudi Ji) 13. In the spring of the third year of Yuanguang (132 years ago), the river migrated, and flowed into Bohai from the southeast of Dunqiu 214 times

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The major floods in China in 1998 mainly occurred in the Yangtze River, Yellow River, Huai River and Pearl River basins. Among them, the Yangtze River basin was the most severely affected, with an area of 10,000 square kilometers, involving 11 provinces and cities, and direct economic losses of 267.2 billion yuan. The Yellow River basin has also suffered severe flooding in Henan, Shandong, Shaanxi and other provinces, resulting in a large number of houses collapsing and farmland damaged.

The flood disasters in the Huaihe River Basin mainly occurred in Anhui, Jiangsu, Henan and other provinces, causing serious losses of people and property. Flooding in the Pearl River basin occurred mainly in Guangdong, Guangxi and other provinces, resulting in a large number of landslides and house collapses. This devastating flood has had a huge impact on our economy and society, and it has also made us realize the importance of flood prevention and disaster reduction.

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2. If the flood continues, you should immediately look for objects that can float such as door panels, tables and chairs, or large pieces of plastic foam. 3. When it is found that the high-voltage line, the tower is tilted or the wire is broken and sagging, it is <>

<> be sure to stay away quickly to prevent direct electric shock or due to the ground"Step voltage "electrocution. 4. Recognize the road signs, clarify the route and destination of evacuation, and avoid taking the wrong road because of panic. 5. If you have been caught in the flood, you must try to hold on to something fixed or floating, and look for an escape opportunity.

After <> flood, the ways and conditions of food contamination are very extensive, which has a serious impact on all aspects of food production and operation, and can often lead to a wide range of food poisoning incidents and foodborne disease outbreaks. Temporary drinking well water, river water, lake water, pond water, etc., must be disinfected. Do a good job of preventing flies, rodents and mosquitoes, wash hands frequently, and do not share personal hygiene products.

Which river basins did the 1998 floods in China mainly take place?

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The major floods in China in 1998 mainly occurred in the Yangtze River basin, the Nenjiang River and the Songhua River basin <>

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In 1998, the Yangtze River, Nenjiang River, Songhua River and so on. The Yangtze River flood was one of the largest basin-wide floods in the 20th century, following the floods of 1931 and 1954.

2. If the flood continues, you should immediately look for objects that can float such as door panels, tables and chairs, or large pieces of plastic foam. 3. When it is found that the high-voltage line, the tower is tilted or the wire is broken, the hole head is sagging, <>

<> be sure to stay away quickly to prevent direct electric shock or due to the ground"Step voltage "electrocution. 4. Recognize the road signs, clarify the route and destination of evacuation, and avoid taking the wrong road because of panic. 5. If you have been caught in the flood, you must try to hold on to something fixed or floating, and look for an escape opportunity.

After the <> flood, the ways and conditions of food contamination are very extensive, which has a serious impact on all aspects of food production and operation, and can often lead to a wide range of food poisoning incidents and foodborne disease outbreaks. Temporary drinking well water, river water, dry lake water, pond water, etc., must be disinfected. Do a good job of preventing flies, rodents and mosquitoes, wash hands frequently, and do not share personal hygiene products.