What is called an underground river Why can t the underground river be entered

Underground rivers are mainly found in limestone areas and are often fascinating. In limestone areas, groundwater containing carbon dioxide dissolves the limestone, forming caves of varying sizes. Many karst caves are connected to the ground through karst collapses or tectonic fissures, from which atmospheric precipitation or surface water enters underground karst caves.

This is the case in limestone areas, where it is sometimes seen that a river is suddenly interrupted and flows underground. Some of the underground caves are connected to each other, and some are connected through fissures, allowing water from the surface to flow through them, forming underground rivers. Dark rivers don't flow underground all the time, but come out at an outlet.

This is the case when we visit limestone areas and often see a stream of water emerging from the ground or cliffs.

Underground rivers vary in size, with the larger ones being able to pass through boats. Riding in a boat in the dark river, twists and turns, deep and winding, cool breeze, roaring water, there is a magical feeling. There are some unique aquatic animals living in the dark river, and there is no light strip for the bandits to see the colored Fanji, and the temperature is low, but it can also survive, which has aroused many people's interest in exploration.

The dark river refers to the underground river developed in the carbonate rock, which is due to the seepage of the surface river into the ground along the underground rock fissures, and the rocks are dissolved, collapsed and transported by water, forming different sizes and lengths in the ground.

1. The intricate pipeline system eventually became today's dark river system.

Underground rivers can be seen in many places in southwest China's provinces, and the scale is huge, such as the underground water system in Dong'an County, Guangxi, the dark river in Yunlian Xiaoyudong in Sichuan, and the dark river in almost all places where there is limestone outcropping. But almost all of China's dark rivers have never been crossed or manually measured inside underground rivers. This is because the survey of underground rivers is very difficult and dangerous, requires specialized equipment and spelunking techniques, and is expensive to operate and a very time-consuming and difficult task.

Therefore, the Longqiao Underground River is actually the first underground river in China that has been jointly discovered and measured by Chinese and French experts.

Because the risk of underground dark river is too great, the potential safety hazards are uncertain.

The appearance of underground rivers is generally in relatively remote caves or canyons, we cannot guarantee whether the air in the underground rivers is circulating, there are many things that are unknown, and no one knows what is inside.

There was once a high-speed railway team digging an underground river when digging a tunnel, and a large amount of water gushed out of the dark river, which said that you have no place to escape, just like a flood beast, these are unknown risks.

The construction team also said that when the flood came, many of their workers were still in the tunnel, and some people wanted to dump trucks to block the water of the dark river, but the truck was quickly washed away by the water of the dark river, and a dump truck full of mud failed to block the water in the dark river, which shows that people can't withstand the water pressure at all.

There are some unknown creatures in the second underground dark river, just like some netizens once broke the news that some inedible poisonous fish were caught in the underground dark river, these fish are very ferocious, and they can eat all the food on the fishing rod the moment they drop it, and they can be hooked soon.

Anglers say that these fish are basically unknown, and they look very fierce, with many teeth that are not as sharp as usual, similar to the feeling of piranhas. So these are the reasons why Shensun You can enter the underground dark river.

The dark river, also known as the "underground flow", has the main characteristics of the river's flow in the karst caves and underground passages formed in large limestone areas due to karstification.

The water level and flow of the dark river are unstable, and the difference between the flow in the dry season and the rainy season can reach 10 times or more than 100 times. Some dark rivers have rapids, some falls, and even waterfalls, and some can form underground lakes. Some of the dark river flows are compressed.

Dark rivers can also be raided and diverted, so that the flow of water is concentrated and the river water ratio is reduced. Dark river water can be used for water supply, and in some areas with large drop-offs, underground hydropower stations can be built.

The spatial distribution of the river is controlled by lithology, geological structure and drainage datum. Dark rivers often occur in the axes of stratigraphic folds, fractures and fractures, the contact between soluble rocks and non-soluble rocks, and near the drainage datum.

Dark rivers have their own systems of recharge, runoff and excretion. Large dark rivers also form underground river systems, which develop mainly along tectonic rupture surfaces. Underground rivers and subterranean currents are important sources of water in karst areas.

Dark rivers are generally underground rivers, that is, they are normal on the surface, but there is a river underground, which flows all year round.

Because they are hidden underground, it is difficult to find the entrance.

According to the Library, underground rivers are usually inaccessible because they are hidden underground, and it is difficult to find the entrance. Even if you can find the entrance, you may need to use special equipment to enter. In addition, underground rivers tend to flow in narrow underground caverns or crevices, making it difficult to navigate.

In addition, there may be damp, dim, and narrow spaces in underground rivers, which are not good for the human body and are not safe. Therefore, under normal circumstances, people are not allowed to move in the narrow empty room, in the rainstorm season Bishu or, the underground river may suddenly rise and flood the entire space, in the absence of professionals, the situation is unknown underground river do not enter casually.

Underground rivers refer to underground rivers, which are often considered to be part of groundwater. Underground rivers are formed due to the flow of groundwater, and flowing rivers are formed in some places underground. The Underground River is often unknown because it is hidden underground, so it is also called the "Underground River".

Explanation of the Dark River.

Underground river. Xu Dishan, "Fluorescent Lantern": It turns out that this cave is a dark river, which is difficult to win, and I haven't been in contact with the intensity of sunlight for a long time, and I can't help but feel dizzy for a while. ”

Word decomposition Explanation of dark dark à not bright, without light, as opposed to "light" : dark . dim (a not bright; b Metaphorical Scene Miserable).

Murky. Dark. Uncovered, Hidden Unrevealed:

Conceal. Signal. *Unlicensed prostitute.

Dark gutter. Implicit (doing things, saying things that contain a certain meaning but not being explicitly said). Undercurrent (a river is an explanation of the river é a common name for a watercourse:

Watercourse. River ditch. River valley.

Rivers. Beach. Riverside.

River fresh (fresh river fish, river shrimp, etc. for consumption). River port. River bend.

River. River. Inland.

Refers specifically to the Yellow River in China: the Hetao. River defense.

Refers to the "Milky Way": Tianhe. Ha Han .

Number of strokes:; Radical : 氵.

Explanation of the Dark River.

Underground river. Xu Dishan, "Fluorescent Lantern": It turns out that this cave is a dark river, which is difficult to win, and I haven't been in contact with the intensity of sunlight for a long time, and I can't help but feel dizzy for a while. ”

Word decomposition Explanation of dark dark à not bright, without light, as opposed to "light" : dark . dim (a not bright; b Metaphorical Scene Miserable).

Murky. Dark. Undisclosed, hidden, unrevealed:

Conceal. The code is dry. *Unlicensed prostitute.

Dark gutter. Implicit (doing things, saying things that contain a certain meaning but not being explicitly said). Undercurrent (a river is an explanation of the river é a common name for a watercourse:

Watercourse. River ditch. River valley.

Rivers. Beach. Riverside.

River fresh (fresh river fish, river shrimp, etc. for edible eggplant). River port. River bend.

River. River. Inland.

Refers specifically to the Yellow River in China: the Hetao. River defense.

Refers to the "Milky Way": Tianhe. Ha Han .

Number of strokes:; Radical : 氵.