Where is the world s poorest freshwater resource?

According to internationally accepted standards, countries with less than 5,000 cubic metres of freshwater resources per capita are considered water-poor, and countries with less than 2,000 cubic metres are considered severely water-scarce. Among the nearly 100 water-scarce countries in the world, China is recognized as a water-poor country, with a per capita freshwater resource of less than 2,200 cubic meters, ranking 100th in the world per capita, and has been included in the "blacklist" of the world's 12 most water-poor countries by the Food and Agriculture Organization of the United Nations. There are 15 countries with severe water scarcity from this side: Egypt, the United Arab Emirates, Oman, Cape Verde, Burundi, Algeria, Yemen, Jordan, Saudi Arabia, Barbados, Singapore, Bahrain, Libya, Kuwait, Qatar, and Malta (with only 82 cubic meters of water per capita per year).

Therefore, it is the region of North Africa, the Arabian Peninsula and parts of the Gulf region (desert reasons), and some small island countries (smaller island countries are prone to lack of fresh water).

The first floor is already very complete, but it is not well summarized.

It is mainly concentrated in the Arabian Peninsula and parts of the Gulf region (desert causes), North Africa (desert causes), and a few small island countries (smaller island countries are prone to fresh water shortages).

The Asia-Pacific region is currently the world's poorest region in terms of per capita freshwater resources.

I think the Sahara Desert in North Africa should be the most water-scarce!

China is currently one of the countries in the world with a serious shortage of freshwater resources, and the per capita water resources are insufficient. More than 400 of the country's more than 600 cities have a shortage of water supply, especially in the northern region. Due to the influence of the monsoon climate in China, the temporal and spatial distribution of water resources is uneven, and drought and flood disasters occur frequently, which is often prone to the phenomenon of flooding in the south and drought in the north.

In addition, human beings use water resources irrationally, and water resources are seriously polluted and wasted. In recent years, due to the continuous occurrence of the phenomenon of destroying and burning the knowledge of forests, land reclamation and indiscriminate cutting, soil erosion has intensified, rivers have been cut off in some areas, and the water area of lakes has shrunk, resulting in a serious shortage of water resources in some areas of China, and it is difficult for people and livestock to drink water.

Suggestions: 1. Save: 1. Moderately improve the water standards of households and enterprises; 2. Advocate water-saving technologies such as sprinkler irrigation and drip irrigation; 3. Water resource recycling; 4. Expand the coverage of green vegetation and conserve water sources; 5. Expand the publicity of water conservation.

2. Governance: 1. Increase sewage treatment efforts and improve sewage discharge standards; 2. Actively research and develop seawater desalination technology to reduce desalination costs; 3. Build reservoirs and reservoirs to transfer water across river basins.

In fact, there is no shortage of fresh water resources in China, and China has the Yangtze River and the Yellow River. There are also many lakes. There are reservoirs in various places, and the reserves of fresh water resources are very abundant, but the main problem in our country is that the population is too large, and the water resources are unevenly distributed.

Affected by the climate, China often has floods in the south and drought in the north. Therefore, the South-to-North Water Diversion Project is also a way to solve the summer drought in the north.

Saving water is a good virtue, don't waste it just because you have a lot of water. Because water in nature cannot be directly supplied to life, it needs to be purified. This purification process also consumes manpower and electricity. So in essence, you are wasting electricity.

1. Water consumption has increased significantly.

2. The ecological balance is seriously damaged.

3. Uneven distribution of freshwater resources.

There are three main types of water pollution**, domestic wastewater, industrial wastewater, and surface runoff containing agricultural pollutants.

Expand the information of the stool exhibitionOur freshwater resources are already seriously lacking.

1. Within the scope of the World Wide Tourism Circle, the top countries are ranked according to the size of water reserves: Brazil, Russia, the United States, Indonesia, Canada, China, Bangladesh, India, Venezuela, and Colombia.

2. China is a country with serious drought and water shortage. Although China's total freshwater resources are 2.7 trillion cubic metres, accounting for 6 per cent of the world's water resources and ranking sixth in the world, China's population is 1.3 billion and its per capita freshwater resources are lower than the world average.

There is a lot of water on Earth, and the total volume of water is estimated to be about 13.8 billion cubic kilometres.

If this water is evenly distributed on the earth's surface, it is equivalent to the entire surface of the earth being covered with a layer of water with an average depth of 2,650 meters. Unfortunately, this water98 is saltwater, mainly found in the ocean. Fresh water only accounts for 2 of the total water of the earth, about 30 million cubic kilometers, and the fresh water of these 2 can not be all used by human beings, because its 88 is frozen in the ice caps and glaciers at the poles, and the remaining 12 that is, rivers, lakes and shallow groundwater that can be exploited can be used by human beings, and the vast majority of them are groundwater, which can not be applied without exploitation, and the water in rivers and lakes that can be directly applied only accounts for 0 04 of the total amount of fresh water.

Water on Earth is always in flux, with water from the oceans and lands evaporating into the atmosphere, and then falling back to the earth as rain or snow, nourishing all things, replenishing rivers, lakes or flowing into the sea. Water can also seep into the ground and sink into underground aquifers. Extremely deep groundwater cannot be replenished or extracted, and is known as primary water and therefore cannot be regenerated.

As a result of this fluid nature of water resources, landlogging or drought results in an uneven distribution of water resources, about 65 of the world's water resources are concentrated in 10 countries each year, while 80 countries with a combined population of 40 (9 of which are in the Near and Middle East) are severely water scarce, and another 26 countries (with a total population of 230 million people) have very little water resources. We call these countries water-scarce countries. The international standard for water-scarce countries is based on the definition given by Swedish hydrologists Marin and Falkenmark:

If a country has less than 1,700 tonnes of renewable freshwater** per person per year, then the country is regularly or often in a situation of low water; If the amount of water per person per year is less than 1,000 tons, then there will be a shortage of water. At present, there are 15 countries with an average annual water of less than 1,000 cubic meters per person.

With only 82 cubic metres per capita per year, Malta has the highest water scarcity among these countries. In addition to Malta, the most water-scarce countries are Qatar (91 cubic metres per capita per year), Kuwait (95 cubic metres), Libya (111 cubic metres), Bahrain (162 cubic metres), Singapore (180 cubic metres), Barbados (192 cubic metres) and Saudi Arabia (249 cubic metres).

square meters), Jordan (318 cubic meters), Yemen (346 cubic meters), Algeria (527 cubic meters), Burundi (594 cubic meters), Cape Verde (777 cubic meters), Oman (874 cubic meters), United Arab Emirates (902 cubic meters), Egypt (936 cubic meters). Expected.

In the 21st century, water in these countries will be more expensive than oil, such as Malta, which will be 68 cubic metres per capita per year.

The total water storage on the earth is about 100 million km3, of which about 97% is saltwater in the ocean, which cannot be directly used by humans. Second, the total amount of fresh water is only 100 million km3, and this is less than 3% of the total water volume of the earth, some of which exist in the polar regions and high mountains in the form of glaciers and ice caps, and it is difficult for human beings to directly use them; for groundwater and soil water, of which 2 3 of the groundwater is buried deep underground; The total amount of surface water such as rivers and lakes is only about 230,000 km3, accounting for the total amount of fresh water. As a result, only about 20% of the freshwater is easily available to humans, while the freshwater from rivers and lakes that can be directly accessed only accounts for the total amount of freshwater.

It can be seen that the freshwater resources available for direct human use are very limited.

1) Queue according to the amount of water resources, the top few are: Brazil, Russia, Canada, China, the United States, Indonesia, Bangladesh, India.

2. China is a country with serious drought and water shortage. China's total freshwater resources are 2.8 trillion cubic meters, accounting for 6% of the world's water resources, second only to Brazil, Russia and Canada, ranking fourth in the world.

3) Water resources in a broad sense refer to the water on the surface of the earth that can be used by human beings, and water resources in a narrow sense are fresh water that can be used directly by human beings. Water is an important part of natural resources. Seawater accounts for the total reserves of water on the planet, and only freshwater.

Icebergs and glaciers account for the proportion of freshwater resources. Water in groundwater and soil, water in lakes and swamps, water in rivers, and water in the atmosphere. Water is cyclical in nature.

The amount of water circulating on Earth is roughly 420,000 km3 per year, of which about 100,000 km3 falls on land. After that, about 40,000 km3 of water flows into the ocean through rivers.

4) The freshwater resources that are relatively easy for human beings to use at present are mainly river water, freshwater lake water and shallow groundwater. These freshwater reserves account for only 0.3 percent of all freshwater and 7/100,000 of the world's total water volume, i.e. about 9,000 cubic kilometres of freshwater resources are actually used effectively in the world every year.

5) Antarctica, the world's richest freshwater resources continent, Antarctica covers an area of 14 million square kilometers, more than 95% of the area is covered by ice and snow all year round, forming a huge and thick ice sheet, its average thickness is 2450 meters, the total amount of ice and snow is about 27 million cubic kilometers, accounting for more than 90% of the total amount of ice and snow in the world, and storing 72% of the world's available fresh waterSome estimate that this amount of freshwater could last 7,500 years.

Most of China's water storage points are concentrated in the Hengduan Mountains and the Qinghai-Tibet Plateau, that is, Yunnan, Sichuan and Guizhou in the southwest of China.

The most abundant water resources in our country are in the southwest. Chongqing is very rich in water resources, with a total of 464.8 billion cubic meters of water resources, which are composed of local surface water, transit water and groundwater. Surface water.

The total surface runoff in Chongqing is 100 million cubic meters, and its geographical distribution is positively correlated with local precipitation. In the mountainous areas on the southeastern edge, the average annual runoff depth in the northern Daba Mountains is millimeters (Qianjiang millimeters (Kaixian), while the Yongchuan in the hilly areas in the western part of the region is only 360 millimeters, a difference of more than 1 times. The inter-annual variation of local surface runoff is also large, with the maximum annual being times that of the lowest year.

There are 36 rivers entering Chongqing, including the Yangtze River, Jialing River and Wujiang River, which are exported through the Yangtze River at Beikou in Wushan County. It is estimated that the total amount of inbound surface runoff is 400.5 billion cubic meters, and the export is 429.2 billion cubic meters.