What is the relationship between the "different world" of karst caves and groundwater?

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In Nalangtun, Bamu Township, Tian'e County, Hechi City, Guangxi

A flood-relief cave is blocked

As a result, some nearby fields

Water began to pour out

After the incident

Water conservancy and other relevant departments immediately

Take emergency measures

The water level is currently falling

There is obviously no river

But water keeps bubbling

Where does this water come from?

Let’s learn about it today

A unique "underground world"

1. The cave is formed by water erosion

Cave formation diagram

A cave is a water body with dissolving power.

Dissolution of soluble rocks

The underground space formed

The formation of caves is

The result of long-term groundwater dissolution in limestone areas

Since the limestone layers

The amount of lime varies

Different degrees of erosion

The rocks are melted, cut,

Collapse, transport and redeposition

Various karst wonders gradually formed

The resulting landforms

Karst landform

2. The water in the cave is groundwater

There is water in the cave almost all year round.

This water comes from

Groundwater in caves

Also called karst water

Karst water can be divided into phreatic water and confined water

In areas where soluble rock formations are exposed over a large area

Karst water is often submerged

Due to the uneven development of karst

The distribution of karst groundwater is also uneven

In mountainous areas where karst is strongly developed

Karst diving is concentrated in

Underground river system

Due to the deep groundwater level

The phenomenon of abundant underground water but lack of surface water often occurs.

In the plains and

A watershed area controlled by certain geological structures

Due to the development of underground rivers and dissolution holes

The distribution of karst diving is relatively uniform.

The water level is also shallow

Mentioned at the beginning

Xiaoshui Cave refers to

A cave with an underground river

Underground river is also called "underground flow"

Refers to the river below the ground

Collected by groundwater

Or surface water seeps into the ground through cracks in underground rocks

Through rock dissolution, collapse and water transport

The underground river

It often has an exit but no entrance

Underground rivers are important water sources in karst areas

3. It is best not to drink cave water directly

The water in the cave is

An important component of groundwater resources

Because of its stable water volume and good water quality

Agricultural irrigation, industry and mining

One of the important water sources of the city

Since the source of the cave water cannot be determined

It may be mountain water or underground river water

Although it seems clear

But in fact there may be

Parasite eggs, pathogenic microorganisms, etc.

In addition

This type of water has a high hardness

Mainly calcium and magnesium ions

It is best not to drink directly

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Review | Chen Rui

Producer | Fan Yizi

Editor | Deng Wanying

Proofreading | Wang Ziyue