Why don’t people in Dujiangyan go into the river to play in the water?

Dear, we have found out for you: Dujiangyan can no longer go into the water. As a tourist city, Dujiangyan City has a sharp increase in the number of summer tourists. Leisure and swimming along the river Activities such as playing in rivers, camping and outings, and fishing are common. The safety situation of drowning prevention is severe, and the difficulty of preventing flash floods is increasing.

And now that the temperature has dropped, it is easy to catch a cold when playing in the water, and it is not safe. It is recommended not to go into the water

Dujiangyan What is the principle?

Dujiangyan is a great water conservancy project in ancient my country, mainly to solve the irrigation and flood control problems in the Chengdu Plain area. Its principle is to provide sufficient irrigation and drainage in the Chengdu Plain area of ​​the Sichuan Basin through water diversion, diversion, and regulation, while also effectively preventing flooding.

Specifically, Dujiangyan consists of two main parts: water diversion buildings and water distribution buildings. The water diversion building is mainly responsible for introducing river water from the Min River and transporting it to the target area that ultimately needs irrigation; while the water diversion building is used to divert river water from the same source to different destinations. The most famous one is Feishayan, which is listed as a World Cultural Heritage because of its ancient history. It can switch out multiple outlets with different flow sizes as needed to better distribute water.

In short, Dujiangyan solved the important problems that had long plagued the social and economic development of the time without affecting normal production and life by skillfully using technical means such as water diversion, diversion, and regulation.

Is it not allowed to play in the water in Dujiangyan?

You should be able to play in the water in Dujiangyan. The places where you cannot play in the water in Dujiangyan are dangerous river sections and places with danger signs and signs. You can no longer play in the water. There are safe places to play in the water in the Dujiangyan Scenic Area. However, when playing in the water in the Dujiangyan Scenic Area, you must follow the instructions and arrangements of the relevant personnel of the Dujiangyan Scenic Area. You cannot play in the water privately.

Why is the Dujiangyan Water Conservancy Project a science?

The scientific nature of Dujiangyan lies in its ability to make full use of the natural terrain at a time when construction equipment, metal manufacturing, and engineering materials were relatively backward. and existing conditions, cleverly achieving the concept of promoting benefits, eliminating harm, and developing on the premise of protection that modern water conservancy projects strive to achieve. It not only achieves comprehensive functional requirements such as flood control, irrigation, sand removal, and drought resistance, but does not do any harm to the natural environment. Too much transformation and damage.

Dujiangyan Canal Head Hub is mainly composed of three main projects: Yuzui, Feishayan, and Baopingkou. The three work together organically, restrict each other, and operate in a coordinated manner to divert water for irrigation. , flood diversion and disaster reduction, and has the effect of "dividing four or six floods and reducing drought".

Yuzui water diversion embankment:

"Yuzui" is the water diversion project of Dujiangyan, because of its It is named after its shape like a fish mouth. It is located in the center of the Minjiang River and divides the Minjiang River into two rivers: the inner and outer rivers. The west side is called the outer river, commonly known as the "Jinma River", which is the main flow of the Minjiang River and is mainly used for flood drainage; the east side along the foot of the mountain is called the inner river.Artificial water diversion channels are mainly used for irrigation.

[Comment] Modern water conservancy can use flood gates to release floods and barrages to retain water for irrigation, which is advantageous with modern metal smelting and processing technology, concrete materials, large construction machinery, etc. It depends on the conditions. In ancient times, without these favorable conditions, it was possible to achieve both flood discharge and irrigation. The idea of ​​​​the fish mouth is indeed more clever.

Feishayan:

" "Floodway" has the remarkable function of releasing floods and sand, so it is also called "Feishayan". Feishayan is one of the three major parts of Dujiangyan. It looks very ordinary, but in fact its function is very great. It can be said to ensure that Chengdu The key to protecting the plains from floods. The main function of Feishayan is that when the water volume of the Inner River exceeds the upper flow limit of Baopingkou, the excess water will overflow from Feishayan on its own; in the event of an extraordinary flood, it will also overflow on its own. The embankment broke, allowing a large amount of river water to return to the main flow of the Minjiang River. Another effect is "flying sand". The Minjiang River rushes from the mountains and mountains, carrying a large amount of sediment and stones. If they are allowed to flow down the inner river, it will Siltation of Baopingkou and the irrigation area. In ancient times, the Feisha Weir was a temporary project built with bamboo cages and pebbles; now it is cast in concrete to ensure a permanent effect.

[Comments] Reservoir Sand Drainage The problem is a relatively thorny issue in the modern water conservancy field, especially the reservoirs on the Yellow River in China. Although the scale of Dujiangyan is not as large as many modern large reservoirs, the skills at that time thought of this method to solve the sedimentation problem, which can It is said to be relatively advanced at that time.

Baopingkou:

Baopingkou plays the role of a 'control gate' and can automatically control the water inflow of the Inner River. It is the Qianshan (now known as Guan A hole cut in the long ridge extending to the Minjiang River. It is a man-made throat to control the inflow of water in the inner river. Because it looks like the mouth of a bottle and has a strange function, it is named Baopingkou. Stay in Baoping The hill on the right side of the entrance is named Lidui because it is separated from the mountain. Before the Baopingkou was excavated, Lidui was part of the Hutou Rock in Jianshan Mountain. Due to the magnificent natural landscape of Baopingkou, there is the "Lidui Lock Gorge" It is known as one of the famous "Ten Scenes of Guanyang" in history.

[Comment] Modern water conservancy projects generally control the amount of water intake by controlling the opening of the water intake gate, so at that time, the water intake was controlled by using It is a pioneering work to control the flow according to the topography of the bottle mouth.

So, under certain limited conditions at the time, the Dujiangyan Project was able to achieve the functions that modern water conservancy projects want to achieve. It is an ancient labor The wisdom of the people is amazing.

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