In order to reduce the flood disaster of the Yangtze River, what work should be done in the middle a

Protect soil and water and dredge river sections.

Do a good job in soil and water conservation on the Loess Plateau in the middle reaches!

Reasons: 1. There are many plains in the middle and lower reaches, and the terrain is low and flat, which is not conducive to flooding.

2. It belongs to the monsoon climate, with a lot of precipitation and concentration, and a lot of heavy rain in summer.

3. The north and south tributaries flow into more.

4. The upstream area has serious damage to vegetation, resulting in soil erosion, and the downstream riverbed is raised, and sediment is silted up, forming an above-ground river (the Jingjiang River section is particularly prominent, known as the "Jiuqu ileum").

5. People surrounded the lake to create farmland, which reduced the area of the lake, and weakened the lake's ability to regulate and store floodwaters.

Measures: 1. Strengthen soil and water conservation work in the upper reaches and plant more trees.

2. The middle reaches of the river section are "cut off and straightened", and the river channel is dredged.

3. Downstream construction of water conservancy projects (reinforcement of flood control embankments, construction of reservoirs) 4. Improve people's awareness of flood prevention and self-rescue ability.

Summary. The middle reaches of the Yangtze River are prone to flooding.

The main reasons are;

The water outlet of the entire Sichuan Basin mainly depends on the Yangtze River, and when the rainfall in Sichuan increases, the runoff of the Yangtze River will increase greatly in a short period of time.

The middle reaches of the Yangtze River are bent and gentle, which is not conducive to the rapid decline of the river, and when a large amount of water comes from the upstream, the water level will rise rapidly, and if the embankment collapses or overflows at this time, serious flooding will occur.

In the past, the response was to strengthen the embankment on the one hand, and set up a flood discharge area in the low-lying area along the Yangtze River, and when the water level rose close to the limit of the embankment, the embankment was blown at a specific point to allow the flood water to flow into the flood discharge area to reduce the water level of the river.

After the completion of the Three Gorges Project, the Three Gorges Reservoir capacity is now being used to reduce the flow of the Three Gorges when floods come from the upper reaches of the reservoir and to avoid the situation of excessive water level.

In which section of the middle and lower reaches of the Yangtze River flood disasters mainly occur, and what are the reasons for the frequent flood disasters in this section of the Yangtze River? What are the governance measures?

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The middle reaches of the Yangtze River are prone to flooding. The main reasons are; The water outlet of the entire Sichuan Basin mainly depends on the Yangtze River, and when the rainfall in Sichuan increases, the runoff of the Yangtze River will increase greatly in a short period of time. The middle reaches of the Yangtze River waterway bends, the terrain is gentle, which is not conducive to the rapid downward flow of the river, when a large amount of water comes from the upstream, the water level will rise rapidly, such as shouting and seeping fruit at this time the embankment collapses or overflows, serious flooding will occur.

In the past, the response was to strengthen the embankment on the one hand, and set up a flood discharge area in the low-lying area along the Yangtze River, and when the water level rose close to the limit of the embankment, the embankment was blown at a specific point to allow the flood water to flow into the flood discharge area to reduce the water level of the river. After the completion of the Three Gorges Project, the Three Gorges Reservoir is now being used to reduce the flow of the Three Gorges and avoid the occurrence of excessive water levels when the water from the upstream floods and seepage.

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1.Precipitation is concentrated in summer. The middle and lower reaches are low-lying and flat.

2.The basin area is wide and the catchment area is large, especially in the year when the summer monsoon is abnormal, the north and south tributaries enter the flood season at the same time, and the flow increases sharply.

3.Vegetation was destroyed, steep slopes were cleared, and lakes were enclosed to create fields. Soil erosion is serious, the water level is rising, and the flood storage capacity of the lake is reduced.

1 The cold and high-pressure air masses in the north generally meet the warm high-pressure air masses in the south in the middle and lower reaches of the Yangtze River, and the quasi-stationary front stays here for a long time, and the precipitation in this area is large.

2 There are many lakes and rivers in the middle and lower reaches of the Yangtze River, so they are prone to flooding.

Nature: There are many tributaries and lakes in the Yangtze River Measures: Construction of reservoirs.

Man-made aspect: unreasonable occupation of river channels, greatly reducing flood capacity, increasing the possibility of flooding Measures: prohibit the indiscriminate felling of trees in the upper and middle reaches, return farmland to lakes, and strengthen river dams downstream.

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No one repairs the flood control levees, and they are often reinforced only when the flood water rises in the summer, and basically no one takes care of ...... usually

1.The human factor.

First, soil erosion in the middle and upper reaches of the region, a large amount of sediment accumulation, resulting in the elevation of the riverbed and the reduction of the riverbed's passing capacity. The second is the destruction of accommodating capacity. During the flood season, excess floods, especially floods with excess capacity, cannot effectively accommodate the flooding hazards.

The third is the destruction of flood control capacity. It is mainly manifested in the elevation of the riverbed and the increase of obstacles in the riverbed. Generally speaking, water conservancy facilities have an obstacle effect, and the large and small bridges along the main and tributaries of the Yangtze River basically have an adverse impact on flood flow.

2.Natural factors.

Naturally, the reason for the frequent occurrence of flood disasters in the Yangtze River basin is abnormal, that is, the rainfall is particularly large, the intensity is particularly strong, and the scope is particularly extensive. Whether flood disasters occur in the Yangtze River basin depends on three factors: first, plum rain; the second is typhoon rain; The third is the warm and humid airflow from the southwest.

From the actual situation in the middle and upper reaches of the Yangtze River, it is mainly caused by the abnormal plum rain, and the typhoon storm surge in the middle and lower reaches, especially in the lower reaches of the Yangtze River, has a considerable impact on it. The southwest warm and humid airflow has a certain relationship with the plum rain, but its abnormal situation is caused by the non-plum rainy season, such as floods and mudslides in western Hubei Province.

Flood disasters have dual attributes, both natural and socio-economic attributes. There are two conditions that must be met for its formation: first, natural conditions:

Floods are the direct cause of flood disasters. Disasters can only occur when the intensity of natural variation in floods reaches a certain standard. The main influencing factors are geographical location, climatic conditions and topography.

Second, socio-economic conditions: floods can only be a disaster if they occur in places where there is human activity. The areas most threatened by flooding tend to be in the middle and lower reaches of rivers, which are often economically developed due to their abundant water sources and flat land.

Around mid-February every year, the water level in the middle and lower reaches of the Yangtze River is always the lowest. Cheng Haiyun, chief engineer of the Hydrological Bureau of the Yangtze River Commission, said that since the beginning of February, the Three Gorges Project has increased its discharge flow, and has continued to maintain a discharge flow of more than 4,000 cubic meters per second when the inflow is only more than 3,000 cubic meters per second. Over the past few days, the Three Gorges Reservoir has supplied 1.5 billion cubic meters of water to the middle and lower reaches of the Yangtze River.

In addition, the gradual increase in rainfall in the Dongting Lake and Poyang Lake basins in the middle reaches of the Yangtze River in February has alleviated many adverse effects caused by drought in the middle and lower reaches of the Yangtze River in advance.

Over the years, human beings have continuously destroyed nature, causing serious soil erosion, forest vegetation, etc., which can play a role in storing water, but in the upper and middle reaches of the Yangtze River, the forest vegetation has been seriously damaged, resulting in a large amount of rainfall, rainwater directly enters the Yangtze River, and water is not stored in time. Therefore, during this heavy rainfall, such a huge flood disaster was caused in the whole basin. The power of nature is great, human beings are part of nature, and if they want to make any changes to nature, they will also be affected by the forces of nature"Returns"Therefore, I think we should protect our living environment, protect nature, for harmonious development, and for all animals and plants that rely on nature to live except for human accidents.

Tree felling and other reasons, resulting in soil erosion, so that the river surface, coupled with a wide range of rainfall, encountered low-lying places with poor protection, it may cause certain floods.

Human Factors:1Soil erosion caused by extensive deforestation of vegetation in the upper reaches of the Yangtze River has led to sediment accumulation and elevation of the riverbed in the lower reaches.

2.A large number of lakes in the lower reaches of the Yangtze River have been enclosed for farmland and constructed, making the water area smaller, resulting in a decrease in the flood storage capacity of the rivers and lakes in the lower reaches of the Yangtze River. 3.

Construction of dams: Affecting the flood discharge of the Yangtze River. 4.

Urbanization: The economy is developed, the cities are dense, and the disaster is severe.

Natural causes: The Yangtze River flows through humid areas, with a wide basin, many tributaries, a long flood season, and a large amount of water, especially in the rainy season, the upper reaches of the main and tributaries have a large amount of water, and there is no sufficient flood control and detention place in the middle reaches, coupled with the bending of the middle reaches of the river, and the downstream flood capacity is insufficient, so there are many floods.

1.Precipitation is concentrated in summer. The middle and lower reaches are low-lying and flat.

2.The basin area is wide and the catchment area is large, especially in the year when the summer monsoon is abnormal, the north and south branches of the river flow enter the flood season at the same time, and the flow increases dramatically.

3.Vegetation was destroyed, steep slopes were cleared, and lakes were enclosed to create fields. Soil erosion is serious, the water level is rising, and the flood storage capacity of lakes is reduced.

The section of the Jingjiang River in the middle reaches is known as the Jiuqu Ileum, which is not conducive to flood discharge, and the measure is to straighten the river section and establish a water conservancy hub.

In fact, the flooding of the lower reaches of the middle and lower reaches of the Yellow River is historical

Far stronger than the Yangtze River. It's just that the dao has dried up recently, and there is no water to drink back. Changjiang Zhen.

It is the middle reach, that is, the section from Yichang to Hukou, that is, that is, the flood response disaster. This section of the river is narrower, and the tributaries have increased significantly. In addition, from the mouth of the lake to Yichang, the altitude rise and fall is very small, and the water is easy to stay here.

There is a lot of precipitation in summer, a significant monsoon climate, and low and flat terrain in the middle reaches.

There are many plains in the middle and lower reaches, and the terrain is low and flat, which is not conducive to flooding.

Improve people's awareness of flood prevention and self-rescue ability.