Water resources quiz, what water resources include

Water resources mainly include the following: water resources in a broad sense refer to all forms of water in nature, including gaseous water, liquid water and solid water; Water resources in the narrow sense 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.

Water resources are water sources that are available or likely to be used, in sufficient quantity and of appropriate quality, to meet the specific needs of a place over a period of time. 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 available quality that can be supplemented from nature and can be used.

On Earth, water, which can be used directly or indirectly by humans, is an important part of natural resources. Natural water resources include river runoff, groundwater, snow and glaciers, lake water, swamp water, and seawater. According to the water quality, it is divided into fresh water and brackish water.

With the development of science and technology, the use of water by human beings has increased, such as seawater desalination, artificial catalytic precipitation, and the use of Antarctic slag to resist land ice.

Due to changes in climatic conditions, the spatial and temporal distribution of various water resources is uneven, and the amount of natural water resources is not equal to the amount of available water.

Unlike other natural resources, water is a renewable resource that can be reused multiple times; and intra-annual and inter-annual volume changes, with certain periodicity and regularity; The form of storage and the movement process are affected by physical geographical factors and human activities.

The Earth's water resources, broadly speaking, refer to the total amount of water in the hydrosphere. It includes surface water and groundwater that are controlled by humans and can be directly used for irrigation, power generation, water supply, shipping, aquaculture, etc., as well as rivers, lakes, wells, springs, tidals, harbors and aquaculture waters. 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.

Water is an indispensable and important substance for the survival of human beings and all living things, and is an irreplaceable and extremely valuable natural resource for industrial and agricultural production, economic development and environmental improvement. Although the term "water resources" appeared earlier, with the time of the Cherish Water Poster.

The connotation of generation progress is also constantly enriched and developed. However, the concept of water resources is both simple and complex, and its complex connotations are usually manifested in: there are many types of water, with movement, and various water bodies have the characteristics of mutual transformation; Water is used in a wide range of uses, and each use has different requirements for its quantity and quality; The "quantity" and "quality" contained in water resources can be changed under certain conditions; More importantly, the development and utilization of water resources is constrained by economic, technological, social and environmental conditions.

Therefore, people's understanding and experience from different perspectives have led to inconsistencies in the understanding of the term water resources and differences in understanding. At present, the concept of water resources can be understood as the amount of water that has both quantitative and qualitative requirements for long-term survival, life and production activities, including use value and economic value. The concept of water resources is generally considered to be broad and narrow.

In a broad sense, water resources refer to all kinds of water and substances in water that can be used directly or indirectly, and water with use value and economic value for human activities can be called water resources. Water resources in a narrow sense refer to fresh water that can be directly used by human beings under certain economic and technological conditions. The water resources discussed in this book are limited to a narrow scope, that is, freshwater resources that are closely related to human life and production activities and social progress.

The earth is like a water balloon, some of which is covered by water, but the resources of fresh water are extremely limited. Of the total water resources, it is salt water and fresh water. In addition, most of the freshwater resources are stored in polar ice caps and glaciers, and the freshwater resources that can be directly used by humans only account for the total amount of water in the world.

Nearly 70 per cent of the freshwater resources on land account for only about the total amount of water on Earth, and nearly 70 per cent of them are solid glaciers, i.e. alpine glaciers in the polar regions and in the middle and low latitudes, which are still difficult to utilize.

The freshwater resources that are relatively easy for human beings to use are mainly river water, freshwater lake water, and shallow groundwater, which account for about 7/100,000 of the world's total freshwater reserves.

Although China's total water resources are large, the per capita amount is not abundant. The regional distribution is also uneven, and the disadvantages are coarse and unpredictable within the year, the inter-annual difference is very large, coupled with serious pollution, resulting in more scarce water resources, the Yellow River water in many places and many times cut off the current situation, so the state launched the "Yellow River Diversion Project", "South-to-North Water Diversion" and other water resources utilization projects, the purpose is to solve the problem of shortage of water resources in some areas.