What are the water resources in our country and what are we going to do about it

Water and water bodies are two different concepts. Pure water is made up of H2O molecules, and water bodies contain a variety of substances, including suspended solids, aquatic organisms, and substrates. A water body actually refers to a natural complex of areas of the earth that are covered by water, including rivers, lakes, swamps, reservoirs, glaciers, groundwater, and oceans, among others.

The relationship between water resources and human beings is very close, human beings regard water as the source of life, and human beings have always gathered in places where there is water in the historical development, and carried out the activities of economic and jujube relief. With the development of society and the advancement of technology, human beings are becoming more and more dependent on water. Water is the most widely distributed and abundant resource in the world.

Water covers more than 70 percent of the Earth's surface, totaling 1.5 billion cubic kilometers; It is also the most exploited resource in the world. Humanity now consumes far more water than any other resource each year, with 3 trillion tonnes of water used worldwide. The distribution of water resources on Earth is very uneven, and precipitation and runoff vary greatly from place to place.

About one-third of the world's land area is dry and rain-scarce, while other regions are prone to flooding during the rainy season. For example, in China, the Yangtze River basin and its southern areas account for more than 82 of the country's water resources, 36 of the cultivated land, and more water and less land; In the area north of the Yangtze River, cultivated land accounts for 64 percent, water resources are less than 18 percent, and there is more land and less water.

The so-called "water bureau" is mainly referring to freshwater resources.

Comparatively speaking, freshwater resources are more scarce and precious than seawater resources.

People often say that freshwater resources mainly include surface water and dihongchai sewer, they are freshwater, and mainly used for industrial life and agriculture, so Tongfu is also an effective resource.

Water resources are water sources that are available or likely to be used.

According to the definition of water resources in the water conservancy science and technology terminology published by the National Committee for the Examination and Approval of Scientific and Technological Terms, water resources refer to the water on the earth that has a certain quantity and usable quality that can be supplemented from nature and can be used.

Water resources, in a broad sense, refer to the total amount of water in the hydrosphere. Including surface water and groundwater that can be directly used for irrigation, power generation, water supply, transportation, aquaculture, etc., as well as rivers, burning, merging, springs, tidals, harbors, and water cities.

In a narrow sense, it refers to Freshwater, which can be restored and renewed year by year. Water resources are indispensable and important natural resources for the development of the national economy. In many parts of the world, demand for water is already outstripping its capacity, and many regions are on the verge of imbalances in water use.

China has more people and less water, and the per capita water resources are less than 1 3 of the world average, and nearly 2 3 cities are short of water to varying degrees. In recent years, with the rapid advancement of industrialization and urbanization and the intensification of the impact of global climate change, the problems of water ecological damage and water environment pollution have become increasingly prominent, and water crises have appeared in some areas, which directly affect the drinking water safety of residents in the district.

The world's freshwater resources account for only 70 per cent of the world's total water, with more than 70 per cent frozen in the Antarctic and Arctic ice caps, and 86 per cent of the freshwater resources being unusable with the addition of inaccessible mountain glaciers and permafrost snow. The freshwater resources that humans can really use are a fraction of rivers, lakes and groundwater, which account for only the total amount of water on the planet.

World water resources, in a broad sense, refer to the total amount of water in the hydrosphere. Since seawater is difficult to use directly, we mainly refer to freshwater resources on land. Through the water cycle, fresh water on land can be continuously renewed and replenished to meet the needs of human production and life.

Scarce water resources refer to natural fresh water that can be directly used by human beings and can be continuously renewed. This mainly refers to surface water and groundwater on land. The annual recharge of freshwater bodies is usually used as a quantitative indicator of water resources, for example, the dynamic water volume of surface water bodies such as rivers, lakes and glaciers is used to represent the surface water resources, and the dynamic water volume of underground saturated aquifers is used to represent the water resources under the ground in front of the ground.

Water is a living resource, an indispensable resource in human life, and a non-renewable resource in a narrow sense and renewable in a broad sense.

Water is a substance necessary for the normal metabolism of the human body, and water has many important functions in the body

1) Water is an important component of cell protoplasm;

2) Water acts as a solvent in the body to dissolve a variety of electrolytes;

3) Water plays a role in transporting nutrients, metabolic wastes and endocrine substances (such as hormones) in the body;

4) Water has high thermal conductivity and specific heat, which can be used as a "heat carrier" to transfer heat between the body and the surface, which helps the human body to regulate body temperature.

Extended Materials. Freshwater pollution has spread across the country. In terms of per capita freshwater resources, China's water shortage mainly refers to the northern region, then the pollution of freshwater resources is a national problem. Moreover, the more water-rich and large cities are, and the more densely populated the areas, the more polluted they tend to be.

As a result, there was a water shortage in the abundant water area. This is an even more serious problem for China's freshwater resources.

Inefficient and over-exploitation coexist. The first is that water use is inefficient, and the more water scarce it is, the less efficient it becomes. For example, in the Yellow River Basin, where there is a serious shortage of water, a large number of agricultural irrigation methods are still used for large-scale flood irrigation.

This is true for agricultural water, but also for industrial use. China's industrial water reuse rate is far lower than the level of 75% of advanced countries, the water consumption per unit of GDP is more than ten times to dozens of times that of advanced countries, and the unit water consumption of some important products is also several times or even dozens of times higher than the advanced level of foreign countries.

Overexploitation of freshwater resources is on the rise. For example, the Haihe River Basin is one of the most densely populated areas of Chinese, including Beijing, Tianjin, most of Hebei and parts of Shandong, Shanxi, Inner Mongolia and Henan, with 26 large and medium-sized cities in the region.

This region is also the most water-scarce in China, with only 293 cubic meters per capita. The socio-economic situation here has changed a lot over the years. Since the 80s of the 20th century, China's water shortage has gradually spread from local to the whole country, which has had a serious impact on agriculture and the national economy.

The concept of water resources is often broadly and narrowly defined.

In a narrow sense, it refers to freshwater that can be directly used by humans, that is, in the process of natural water cycle, atmospheric precipitation falls to the ground to form runoff, which flows into surface water in rivers, lakes, swamps and reservoirs, and groundwater that seeps into the ground. People use it to meet the needs of industrial, agricultural and domestic water, and the amount of water resources is generally expressed in terms of runoff.

In a broad sense, it refers to all kinds of water and water substances that can be used directly or indirectly by human beings, and water with use value in social production can be called water resources. It includes all freshwater and brackish water on Earth, both natural and renewed, as well as water that has been treated by humans using engineering or biological measures.

Water is a resource because of its physical, chemical and natural properties. There are broad and narrow senses of water resources, and usually when we talk about water resources, we mean water resources in the narrow sense.

Water resources in a broad sense.

Water resources in a broad sense refer to the water that is widely present on the earth's surface and in the earth's lithosphere, atmosphere, and biosphere in solid, liquid, and gaseous forms in nature, and is the total amount of water on the earth, including seawater. The earth we live on is a planet of water, oceans, rivers, lakes, streams, ......Through the hydrological cycle, they are interconnected and influence each other, and together they form a complete hydrosphere of the earth, which is the birthplace of life. In this sense, any water in the hydrosphere has direct or indirect use value for human beings and can be regarded as water resources.

It includes both renewable and non-renewable water resources.

Water resources in the narrow sense.

Water resources in the narrow sense are water that is concentrated in rivers, lakes, glaciers and aquifers buried in shallow underground during the water cycle. It is more than atmospheric precipitation, can be replenished and renewed year by year through the water cycle, and is easily used by humans, including surface water, groundwater and soil water. Among them, surface water is rivers, glaciers, lakes, swamps and other water bodies; Groundwater is the dynamic volume of groundwater catchment; Soil water is water dispersed in a loose surface layer on the lithospheric surface.

Chemical formula of water: H2O

Water is an important part of natural resources and the main material basis for the structural composition and life activities of all living things. On a global scale, water is the link that connects all ecosystems, and natural ecosystems both control the flow of water and continuously promote water purification and recycling. Therefore, water in the natural environment is of decisive significance for the survival of living beings and human beings.

The Earth's water resources, broadly speaking, refer to the total amount of water in the hydrosphere.

Seawater is brackish water and cannot be used directly, so the water resources commonly referred to mainly refer to freshwater resources on land, such as river water, fresh water, lake water, groundwater and glaciers. Freshwater resources on land account for only the total amount of water on Earth, and most of them (nearly 70 percent) are solid glaciers, i.e. mountain glaciers in the polar regions and in the middle and low latitudes, which are difficult to exploit. At present, the freshwater resources that are relatively easy for human beings to use are mainly river water, freshwater lake water, and shallow groundwater, and the reserves account for about 7/100,000 of the world's total freshwater reserves.

According to research, from the point of view of the water cycle, the world's freshwater resources that are really effectively used are about 9,000 thousand cubic meters per year.