Where does this disappearing water go when the water table drops?

We know that in recent decades, more and more water resources have been exploited and utilized by human beings, all because human beings have continuously demanded these resources from nature in order to meet their own needs, including oil, minerals, groundwater, and so on. And especially the groundwater resources in them, in many areas, they have been depleted under one of the groundwater resources in these areas. So where does all this disappearing water go when the groundwater level drops?

The answer is as follows. <>

1. It is used by human beings on a large scale and is used in life and agriculture. First of all, human beings will definitely use these water resources to meet one of their current self-needs, including daily life, water, agriculture, irrigation, and some water storage. In particular, some of the water used in agricultural irrigation can cause salinization of the land if it is not used properly.

This not only wastes water, but also leads to the desertification of the land. The salt content of groundwater is relatively high, which undoubtedly causes another agricultural problem for human beings. <>

Second, it is used by people to put into production and use. In fact, in many arid regions, such as the North China Plain in China.

There are also three northeastern provinces.

Due to the long-term use of some of the water sources in the rivers, some rivers have fallen into dry wells. At this time, human beings exploited groundwater, and people exploited groundwater for these factories, and used some pumps to meet the needs of their own factories in a large area. In the course of such a long time, there have been cases of depletion of groundwater, and in recent years, the news has been detailed.

3. Return to nature and turn into water vapor.

The last point is that the groundwater is exposed to high temperatures for a long time, and then turns into water vapor and returns to nature. That is to say, the amount of groundwater is very large, but the amount of groundwater evaporated in it is very rare.

They are used by humans on a large scale and are used to water crops. In some arid areas, people will extract groundwater in factories for industrial use. Others will also turn into water vapor and return to nature.

According to the theory of the water cycle, the water does not really disappear, but goes to other places by transforming itself. Some of the groundwater that disappears may go to rivers or into the atmosphere.

Water is a substance in the world, it follows the universal law of matter, it will not disappear out of thin air, nor will it be increased out of thin air, so the decrease of water in one place must have an increase in water in another place.

The reasons for the decline in groundwater levels are mainly human factors and natural factors

1. Human factors. The excessive exploitation and utilization of human beings, due to the excessive exploitation and unreasonable use of groundwater, often causes a serious drop in the groundwater level, forming a large area of groundwater decline funnel, and in urban areas where groundwater consumption is concentrated, it will also cause land subsidence.

2. Natural factors. **Cause the elevation of the terrain, the subsidence of the underground river, etc.; diversion of rivers; Climate changes, such as prolonged droughts and increasing water use for agricultural irrigation and industry, have led to a general decline in the water table.

There is an imbalance in precipitation between different parts of the land, drought occurs in some places, waterlogging occurs in some places, and these waters go to the waterlogged places, and if the drought persists for several years, the water level of rivers will decrease in some areas, the area of lakes will shrink, and the groundwater level will fall.

In addition, one-third of the earth is land and two-thirds is the ocean, on which water vapor evaporates, and returns to land in the form of precipitation (rain, snow, fog, etc.) every year, realizing the sea and land water cycle and achieving global water balance. However, the amount of water that falls on land every year is more or less, and the amount of precipitation is low, which makes it prone to drought. Less water landed on land, and more water went down into the ocean.

The uneven distribution of precipitation between land and sea, or the uneven distribution of precipitation within land, is related to anomalies in atmospheric circulation. The atmospheric circulation is a planetary wind system with a global scale, and its changes will cause an imbalance in the distribution of precipitation, which can be seen from the precipitation situation in our country this year.

This year's typhoons in the northwest Pacific have a distinct feature that there are more northward and fewer landfalls, and since Typhoon Lekima, many typhoons such as Hagimis, Pipa, Mina, and Taba have not made landfall.

Typhoons that have landed in South China and the middle and lower reaches of the Yangtze River have not come or are very few, so that the drought in central China this year, the water level of Panyang Lake has been declining, and the water level of rivers in many areas is also falling, and the typhoons have landed less, and most of the typhoons in the north have been annihilated in the westerly wind belt in the middle latitudes, and the typhoon has rained down on the ocean surface, that is, the rain should have come to the land, but ran into the ocean.

Let's take a look at the subtropical high activity, this year's subtropical high is affected by El Niño, the overall hypertrophy, covering a large area, the middle and lower reaches of the Yangtze River in July every year, after the end of the plum rain, into the drought stage, but due to the subtropical high coverage situation, the time is long, the activity is weakened, but the mid-latitude westerly wind belt is active, resulting in more cold vortices in the northeast, more precipitation, and waterlogging, and central China is affected by the subtropical high, less precipitation, and drought. This change in the weather system has been unevenly distributed, and the rainwater has traveled to Northeast China, North Korea, and Japan.

Used by humans. With the continuous development and growth of human society, the consumption of fresh water has increased dramatically, whether it is agricultural irrigation or industrial life, water consumption has increased dramatically. The earth's water resource recycling cannot keep up with human profligacy, coupled with the destruction of many green ecosystems, global warming and other reasons, freshwater resources are becoming increasingly depleted.

There are two main destinations, the first is where the flood flows, and the second is where the temperature rises and evaporates, which causes the groundwater to dry up.

It may have dried up and evaporated, and the water should be gone, so save water and don't waste it.

This water is used by some large factories to make and research something, and in the process it will consume a lot of water resources, which is also a series of pollution of water resources.

1. The water level drops, resulting in water shortage or even depletion.

2. The decline of regional groundwater level is still the main inducing factor of geological disasters such as land subsidence, karst collapse, and ground fissures.

The main reasons for the decline in groundwater levels are:

1. Human factors. For example, the excessive exploitation and utilization of human beings.

2. Natural factors. For example, ** causes the elevation of the terrain, the subsidence of the underground river, etc.; diversion of rivers; climate change, etc.

The meeting called for accountability and a sound long-term mechanism for groundwater management. Local governments should fulfill the relevant requirements of the most stringent water resources management system, assume the main responsibility for water resources management and protection, and coordinate various departments, industries, symptomatic drugs, and comprehensive countermeasures. Improve the working mechanism and system led by the industry and supported by the industry, and gradually build a groundwater overexploitation mechanism system.

Strengthen the main responsibility of the people at the county level under their jurisdiction, and transmit pressure in a timely manner. Water conservancy departments should actively take follow-up actions, do a good job in supporting work, provide staff officers, and give play to the role of industrial departments in providing talent, technology, and intellectual support.

It is necessary to strengthen control over the development and utilization of groundwater, strictly implement the management of mining prohibition areas, prohibit the use of mining areas, and not increase the amount of groundwater extraction in mining areas alone. It is necessary to promote the fine management of water use, deeply analyze the rationality of water demand, and resolutely curb unreasonable water demand. Further strengthen the management of machine wells, comprehensively clean up illegal water intake in the jurisdiction, and continuously improve the monitoring and measurement rate of groundwater.

In addition, strengthen supervision and implement the responsibilities and measures for the control of groundwater overexploitation. Local people at all levels should practice "strong supervision" in the management of water resources, especially groundwater management. The Ministry of Water Resources will carry out supervision and inspection in a timely manner, further improve the mechanism of notification, recall, and agreement, and promote the effectiveness of groundwater overexploitation through strong supervision.

The water collection drainage method is gravity drainage. That is to say, when digging the foundation pit, dig the watershed along the bottom of the pit, and set up the water collection at certain intervals, so that the water seeping out when digging in the foundation pit flows to the collection well through the basin, and then the water is pumped out of the collection well by using a pump. The method of water collection and discharge generally adopts the method of blocking, sparse and pumping.

When the depth of foundation pit excavation is not too large and the inflow of foundation pit is not large, the water collection and discharge method is the most widely used, the simplest and most economical method. Open ditch, water collection well arrangement open ditch, water collection drainage most of the foundation pit on both sides or around the setting of drainage outlets, every 4 corners of the foundation pit or 30 40 meters to set up water collection, so that the groundwater discharged by the foundation pit is gathered in the water collection through the drainage outlet, and then it is discharged out of the water collection with a pump. Pump for water collection and drainage is used to drain water from the collection well.

Commonly used pumps include centrifugal pumps, submersible pumps, and extended shaft pumps.

Connected with the local foundation pit, the permeability of the soil layer and the drainage area are large, in order to reduce the complexity of a large number of drainage outlets, the longitudinal, length and deep ditch can be set up in the deep foundation or appropriate part in the foundation pit, and the ditch or trench is arranged in the rest of the part, which is connected with the main ditch, and the blind ditch is made through stones or sand through the foundation part. The groundwater control method of the life-set discharge method is simple in equipment and convenient in construction, but it must meet certain conditions when used alone in deep foundation pit engineering. The disadvantage of the catchment discharge method is that the groundwater seeps along the slope, foot of the slope or the bottom of the pit, causing the bottom of the pit to soften or turn mud.

When the depth of foundation pit excavation is large, if the composition of the soil is relatively fine, under the action of groundwater hydrodynamic pressure, flowing sand, pipe gushing, pit bottom uplift and slope instability may also occur.

The reason why the groundwater level is falling is that we are drinking groundwater, and if we want the groundwater to slow down, then we drink less groundwater, and then the groundwater will slow down.

This is because the water will be infiltrated by the soil during the preservation process, so the water level will drop later, and it is necessary to choose some buildings that are not easy to penetrate, and it is necessary to save water.

This is due to changes in geology and an impact on the ecological environment. More trees should be planted in normal times, water resources should be protected, and people's environmental awareness should also be raised.

Because the warming climate will cause the water table to drop, you can plant trees in large areas, you can plant some green plants, and don't waste water.

When employing precipitation and drainage measures, the following factors should be considered:

1) The type of soil and its permeability coefficient.

2) The elevation of the water level that is required to be lowered. Generally, it should be lowered to the bottom of the foundation pit and twisted.

3) What form of foundation pit wall support mode is adopted, especially deep foundation pit.

4) The size of the foundation pit area There are two types of methods to lower the groundwater level: (1) surface drainage, or "catchment well dewatering method." 2) Well-point precipitation.

Human overuse, climate change, etc., we need to save water, start from our side, protect the environment, reduce the cutting down of trees, and plant more trees to improve the environment.

The decline of groundwater level will cause the increase of effective self-weight stress in the soil below the original groundwater level, resulting in additional subsidence of a large area of the surface.

Although the rise of the groundwater level will not increase the self-weight stress, it will also produce additional settlement due to the increase in the compressibility of the part of the soil between the original groundwater level and the changed groundwater level.

The groundwater level rises, and the bearing capacity of the foundation decreases due to the change from the natural gravity of the underwater part to the floating weight.

The main reasons for the decline of groundwater level are: 1. The water supply of groundwater cannot keep up with the speed of consumption. For example, there is a significant decrease in rainfall, the diversion of rivers, and the overexploitation of human beings.

2. Caused by geological changes. Such as the elevation of the terrain and the subsidence of the underground river.

The main reasons for the decline in the groundwater level are:

1. Human factors. Overexploitation of human beings.

2. Natural factors. Such as the elevation of the terrain and the sinking of the underground river; diversion of the Sullen or Ling rivers; climate change, etc.