Is drought a natural disaster or a man made disaster? Why doesn t drought artificially rain?

Drought, I think it's a natural disaster, but in the end, it's man-made, if it weren't for human destruction, and pollution, there wouldn't be drought, and now the climate is changing, and there are all kinds of problems

From a purely natural point of view, drought and drought are two different scientific concepts. Drought usually refers to a climatic phenomenon in which the total amount of fresh water is too low to meet human survival and economic development. Unlike drought, which is a long-term phenomenon, drought is an occasional natural disaster, and even in areas where water is usually abundant, it can be caused by temporary climatic anomalies.

Drought and drought have been major natural disasters facing humanity since ancient times. Even today, when science and technology are so advanced, their catastrophic consequences still abound. It is particularly noteworthy that with the economic development and population expansion of human beings, the phenomenon of water shortage is becoming more and more serious, which has directly led to the expansion of arid areas and the aggravation of aridification, and the trend of aridification has become a global concern.

Drought is a climatic phenomenon in which the air is dry and the soil is dehydrated due to a long period of lack of rainfall.

Minor drought: consecutive days without rainfall, up to 16 30 days in spring, 16 to 25 days in summer, and 31 to 50 days in autumn and winter.

Moderate drought: 31 to 45 consecutive days without rainfall in spring, 26 to 35 days in summer, and 51 to 70 days in autumn and winter.

Severe drought: 46 to 60 consecutive days without rainfall in spring, 36 to 45 days in summer, and 71 to 90 days in autumn and winter.

Severe drought: The number of consecutive days without rainfall, more than 61 days in spring, more than 46 days in summer, and more than 91 days in autumn and winter.

Personally, I feel that everything in the world is short of water during the drought, imagine if a person does not drink water for several days and sees urine will drink, and now people's physical fitness is not as good as before, once the water is lacking, the body will lack a lot of things, the body will be very weak, people can not find water to drink, the surrounding plants and creatures can not find water to drink, no food can be without water is not good, so .........

Yes.

The high temperature lasts for a long time, and it is difficult for arid areas to alleviate the drought through artificial rainfall, because artificial rainfall also requires some necessary conditions, and if the conditions are not met, artificial rainfall is difficult to succeed.

If this had been possible in arid areas, there would have been experiments in the desert long ago, and there would not have been such a devastation of the desert. However, everyone must pay attention to safety and take sun protection measures when going out.

In order to implement artificial rainfall, three basic conditions must be met: first, the water vapor of the clouds floating in the sky must be abundant enough, and secondly, the clouds must have an upward trend. The third point is that there is a condensation nucleus.

Only if these conditions are met at the same time, the local authorities will carry out this task neatly, so the staff must observe the weather conditions and choose the right weather for manual operation. The phenomenon of high spring temperatures in many parts of the south is painful. Therefore, in some places, when the conditions are right, rain is immediately followed, which can temporarily alleviate the dry situation.

In rural areas, there are large areas of planting land, and the land is dry without rain for a long time, and the seeds may lodging or even not grow rice, but the weather forecast does not show rain for a long time, so it can only be made out of thin air by artificial means. However, this rain did not last long, and in some areas it stopped after only a few minutes of rain.

Then there must be rain conditions! Say rain and say rain!

Artificial rain should also become rain clouds.

National or local issues.

That's a question...It's like a 90-year-old man taking Viagra....

Drought refers to meteorological disasters caused by severe or abnormal droughts.

Drought is a disaster caused by insufficient soil moisture to meet the needs of crops and pasture growth, resulting in a large reduction or extinction of yields. Drought is a widespread natural disaster, which not only affects agriculture, but also seriously affects industrial production, urban water supply and the ecological environment. In China, the normal growth of crops affected by water shortage during the growing period is usually called drought, and the reduction of yield by more than 30% due to drought is called disaster.

Areas where drought is frequent are called drought-prone areas.

The hazards of drought

1. The most direct harm of drought is to reduce the quality and yield of crops and fail agricultural harvests. For example, the empty shell rate of early rice increased due to high temperature ripening, and cracked and lodging occurred in some paddy fields.

The drought of dryland crops is more obvious, peanuts die, and navel oranges show drought symptoms such as yellowing and curling leaves.

2. In severe drought, people have difficulty drinking water and their lives are threatened.

3. Drought will cause a decrease in hydropower generation and a shortage of energy, which will seriously affect economic construction and people's lives.

4. In the dry season, fires are prone to occur and are difficult to control and extinguish. Most fires, especially large forest fires, occur during the dry season.

5. Droughts often bring locust plagues.

Disasters are generally caused by the destruction of crop moisture and the reduction of yields.

The degree of damage to crops caused by drought is related to the season in which it occurs, the type, variety and growth period of crops. Early spring affects spring sowing, or causes lack of seedlings and broken ridges of spring-sown crops, and affects the normal growth of overwintering crops.

Hazard 1Drought leads to a decrease in the body's immunity.

2.Drought is the number one disaster that endangers agricultural and animal husbandry production.

Meteorological conditions affect the distribution, growth and development, yield and quality of crops, and water conditions are the main conditions that determine the type of agricultural development. Due to its high frequency, long duration, wide range of impact and large delayed impact, drought has become the most serious meteorological disaster affecting China's agricultural production. Drought is the main animal husbandry meteorological disaster in China, which is mainly manifested in affecting pasture and livestock products and aggravating grassland degradation and desertification.

3.Drought has further deteriorated the ecological environment.

a Warming and drying of the climate has led to a decline in the water level of lakes and rivers, and some of them have dried up and cut off. Due to the lack of surface water supply caused by drought and water shortage, we can only rely on a large amount of over-extracted groundwater to maintain the livelihood of residents and the development of industry and agriculture, but over-exploitation of groundwater has led to a series of ecological and environmental problems such as groundwater level decline, funnel area expansion, land subsidence, and seawater intrusion.

b Drought leads to degradation of grassland vegetation. Most areas of China are in arid, semi-arid and sub-humid ecologically fragile zones, and the climate is characterized by the prevailing southeast monsoon in summer, the same season of rain and heat, and the precipitation mainly occurs from April to September every year. Although the rainy season in the northern region is also from April to September every year, there is great pore size heterogeneity, and it has the characteristics of nine droughts in ten years.

Due to the change of climate and environment and unreasonable human disturbance activities, the vegetation has been seriously degraded, and after entering the 21st century, drought has a tendency to worsen for several consecutive years, and it is a continuous drought in spring, summer and autumn, which is very unfavorable to the fragile ecosystem. c Climatic aridity exacerbates the process of land desertification.

d.Warming and drying of the climate has led to other natural disasters.

Droughts in winter and spring are prone to forest fires and grassland fires. Since 2000, due to the continuous increase of global temperature, the climate in the northern region has been dry, the ground temperature of woodland is high, the grassland has a long dead period, and the underground forest fire and grassland fire have an increasing trend.

It has the greatest impact on crops, which will cause no harvest of grains, so that people will only be hungry.

In fact, what we often call drought is a drought situation caused by abnormal weather, because of a serious lack of moisture in the soilThe water balance of crops is disrupted, resulting in reduced crop yields. This can lead to a series of food problems and even famineIt can also cause water shortages in animals and plants, although indirectly lead to death.

However, locusts may occur after a droughtThis can exacerbate hunger caused by drought and may even cause social unrest.

Due to the lack of water, long-term animal husbandry does not get the growth of organisms, and there will be a large reduction in production or extinction. This is a relatively common natural disaster, which will not only affect agriculture, but also affect the ecological environment of industrial cities.

The formation of drought is generally related to the local climate, and even the precipitation in some places is less than 250 mm. This area has become arid, and if the precipitation is between 250 and 500 mm, it is called a semi-arid zone.

The world's arid regions account for about 25% of the world's land area, most of which are in the Sahara Desert and western North America and northwestern China.

If the snow melts less, a drought situation can also formMost areas of China belong to the Asian monsoon climate, and the precipitation may be affected to a certain extent with the distribution of land and seaThere are also imbalances between regions and between seasons.

In the area north of the Huai River in the Qinling Mountains, there will be drought in spring, and drought may occur in the Huang-Huai-Hai area in spring, summer and autumn, which is a relatively large area of drought in China.

Eastern Africa is sometimes hit by severe droughts due to lack of rainfallIt even led to the death of all crops and the loss of grains. A large number of livestock have also died due to lack of water, causing serious losses to local peopleand even let the local economy drop directly.

Nature suffers from many disasters caused by drought, and many measures have been taken around the world to prevent droughts. For example, some areas will develop agricultural irrigation, which may change the variety of crops.

In this way, some more drought-tolerant varieties are selected to make full use of the limited precipitation, which allows the plants to grow adequately.

In some areas, trees have been planted to improve climatic conditions and reduce water evaporation. At the same time, modern technology and water-saving measures are used, artificial rainfall and mulching are used, and even groundwater and seawater are used. These measures are aimed at preventing drought and reducing all losses to human beings.

If the drought lasts for a long time, people's food cannot be harvested, so it is called a disaster. Drought can lead to particularly poor harvests and poor air. It affects the photosynthesis of fruit trees and affects the harvest of farmers. Huge losses for farmers.

We are accustomed to saying that drought is a drought because of abnormal weather, because of the serious lack of water in the soil, the water balance of crops is destroyed, which leads to a reduction in crop yields, which will cause a series of food problems, and even famine; Because after the drought, locusts are generally triggered, which will exacerbate the hunger caused by the drought, and may even cause social unrest, people say that the cause of drought is because the long-term animal husbandry can not get the growth of organisms, there will be a large number of production reductions or extinctions, it is a general natural disaster, not only agriculture is affected, but also will affect the ecological environment of industrial cities.

The main reason is that if there is a large-scale drought, it will cause very bad results, especially in ancient times, if there is a drought, then it will definitely cause no harvest, so that farmers suffer great losses, and even the family will be ruined, so it will be said to be a drought. The impact of drought on human beings is very large, it is likely to cause high temperature weather to cause people to feel unwell, a large area of illness, and also cause the rampant plague, which will reduce food production and affect people's lives.

This is because if there is a drought, it will lead to a significant reduction in the production of agricultural products, which will lead to a shortage of food for people, and then there may be infectious diseases, and at the same time, it will lead to extreme water shortages, and people may starve to death.