Causes of floods, causes of floods

Causes of frequent floods in our country:

1: China is a monsoon climate, concentrated in the eastern region, monsoon climate, rainfall changes a year, seasonal changes, generally speaking, that is, there may be less precipitation in a year, more precipitation in a year, and the rainfall in a year is mainly distributed in summer, and there is less precipitation in winter.

2: This year's precipitation, the warm and humid airflow from the south, has been stagnant in the south for a long time, so most provinces in the south have more precipitation

The cold air mass in the north also moves south, causing the two large air masses to converge and form frontal rainfall.

3: It is June, the south of our country is in the rainy season, and it is common to have a lot of rainfall

4: Human causes have had an important impact, such as:

The destruction of the forests on the upper reaches of the rivers leads to the destruction of the trees.

Storing water sources, shaving peaks and replenishing dryness and other effects are weakened

The enclosure of lakes and farmland leads to the storage of floodwater, and the flood distribution capacity is weakened, which will increase the pressure on flood control

A typical representative is the Dongting Lake area, the cause of the flooding of the Yangtze River in 98, and this article is the main reason

5: Global warming may also be the cause, causing global climate abnormalities

6: The reason for the big disaster, the flood disaster is mainly distributed in the economically developed south of China, with a large population, many important cities, and few industries and agriculture, so the disaster is serious

Since some people say that the analysis is not good, then I will add one more point to calm the anger of the public!!

7: Most of the water conservancy projects in southern China are in disrepair and are also important.

The reason is that some water conservancy projects in southern China were built in the fifties and sixties of the last century, so the solidity of water conservancy projects and the degree of flood control need to be considered

The disrepair of water conservancy projects has increased the difficulty of flood control.

Affected by global climate change.

Flood disasters occur due to the following reasons:

1. Soil and geology. The local soil layer is heavy in texture, poor in permeability, weak in vertical infiltration, high in soil organic matter content and large in water storage.

2. Geomorphological features. When the area is located, there are low mountains and hilly areas with undulating surfaces, vertical and horizontal valleys, complex terrain, and slow drainage, etc., which are affected by flood support and backflow, so that the internal water cannot be excluded.

3. Climatic reasons. Due to the uneven spatial and temporal distribution of water resources, it causes short-duration high-intensity rainstorms or long-term continuous precipitation due to the influence of northbound typhoons.

4. Intensity of human activities. In some areas, due to the excessive concentration of human beings, people do not hesitate to seriously damage the ecological environment in order to survive.

5. The flood control project is not up to standard. Due to the disrepair of some flood control projects, when the river overflows, it cannot effectively remove the internal water in time.

Floods can cause great damage to the environment on which human beings depend. For example, floods will cause soil erosion every year, a large amount of soil and its nutrients are lost, resulting in poor land, and at the same time, the sediment content in the water flow increases, resulting in the attenuation of river function, the shrinkage of lakes, and the desertification of cultivated land, and the serious consequences are incalculable.

Major floods will cause a large amount of farmland to be washed away and submerged, crop production will be reduced or even lost, and the agricultural product processing industry and light industry will lack raw materials or the cost of raw materials will increase, resulting in factory production reduction and shutdown, followed by unemployment of workers.

Major flood disasters will also cause the living standards of the people in the disaster areas to decline, lack basic livelihood guarantees, and a large number of victims will appear, disrupting normal social order and impacting all aspects of society.

Water disasters include torrential floods, mountain floods, snowmelt floods, ice floods, dam burst floods, etc. 1. Torrential floods are the most common and most threatening floods. It is formed by rainfall of greater intensity, referred to as stormwater.

The main areas threatened by heavy rains and floods in China are 10,000 square kilometers, distributed in the lower reaches of the seven major rivers of the Yangtze River, the Yellow River, the Huai River, the Haihe River, the Pearl River, the Songhua River, and the Liao River, as well as the southeast coastal areas. <

Water disasters include torrential floods, mountain floods, snowmelt floods, ice floods, dam burst floods, etc.

1. Torrential floods are the most common and most threatening floods. It is formed by rainfall of greater intensity, referred to as stormwater. The main areas threatened by heavy rains and floods in China are 10,000 square kilometers, distributed in the lower reaches of the seven major rivers of the Yangtze River, the Yellow River, the Huai River, the Haihe River, the Pearl River, the Songhua River, and the Liao River, as well as the southeast coastal areas.

2. A flash flood is a flood that rises and falls in a mountain stream. Due to the steep slope of the mountainous ground and riverbed, the runoff and confluence are faster after rainfall, forming a flood peak with sharp fluctuations. Therefore, flash floods have the characteristics of strong suddenness, concentrated water volume and strong destructive power, but the scope of a disaster is small.

Such floods, when they form solid runoff, are called mudslides.

3. Snowmelt floods mainly occur in high-latitude snow-covered areas or alpine snow-covered areas.

4. Ice floods mainly occur on the Yellow River, Songhua River and other northern rivers. Because some river sections flow from low latitudes to high latitudes, when the temperature rises and the river freezes, the upper reaches of the lower latitudes are frozen first, while the lower reaches of the high latitudes are still frozen, and the upstream river water and ice are piled up on the downstream riverbed to form ice dams, which are also easy to cause disasters.

5. Dam failure flood refers to the instantaneous burst of dams or other water-retaining buildings, and the sudden outflow of water bodies, causing disasters to downstream areas. Although the flood is not very large, it is very destructive. In addition, on mountain rivers, at the time of ** occurs, sometimes landslides and block the river, forming a dammed lake.

Similar floods can occur in the event of a dam lake bursting.

1. Lead to personnel**.

Death or injury caused by direct inundation of floods or collapse of buildings impacted by floods, and osmium death or death of disease caused by famine or disease. This is the most direct hazard of flood disasters to people. 2. Cause outbreaks and epidemics of diseases.

Due to flooding or flooding, livestock floods need to be moved in large quantities. On the one hand, the transfer of infectious agents to non-endemic areas, and on the other hand, the entry of susceptible populations into endemic areas, the migration of such populations has potential epidemic factors. Such as influenza, measles, and malaria can cause epidemics with this movement.

Some of the most common diseases, such as red eyes and ** disease, can also increase the chance of transmission due to dense crowds and contact. When evacuating from a flood disaster, pay attention to turning off the gas valve and the main power switch. Household gas valves, power switches, etc. are susceptible to external forces in flood disasters, and leakage occurs, which are easy to cause accidents such as gas ** and electricity leakage, and should be closed in time when evacuating.

Floods can cause a lot of inconvenience to people, all crops are damaged, and houses collapse and mudslides occur.

Floods will bring great harm, will make the people's property losses very serious, if once a flood occurs in a certain place, it will be terrible, serious will wash away the houses, that is, all the property is lost, and even the personnel have **.

Floods can cause people, and floods are the most direct hazards to people caused by floods due to direct flooding or collapse due to flooding buildings.

Lao Huang carried two baskets of vegetables, walked four or five miles, and rushed to the market to sell. Two baskets of vegetables cost 150 pounds, Lao Huang picked it on his shoulders, tired but happy, humming a small tune along the way. When he arrived at the market, the vegetables were sold for nearly 200 yuan, and Lao Huang used the money to buy a bag of fertilizer, cut some meat, buy two bags of salt, and other bits and pieces.

The fertilizer weighs 50 pounds and is placed in a basket, just right. However, the problem is that the miscellaneous things on the other end weigh no more than ten pounds together. The weight of the two baskets is different, and when you pick it up, the light end is raised high.

Lao Huang could only move the flat burden on his shoulder as far back as possible, and at the same time, put his hand on the front of the flat burden, trying to press down. But still no. The difference in weight between the two baskets is too great and unbalanced to pick up at all.

Answer]: The main types of flood disasters include floods, flash floods, mudslides, waterlogging, drought, storm surges, catastrophic waves, and deterioration of the water ecological environment. The great feast celebrates the forces of nature as a major cause of flood disasters.