Slogans and slogans for protecting Minjiang River

Legend has it that there is a dragon on the Minjiang River that makes waves, making floods and droughts impermanent and harming people. Li Bing, the guard of Shu County, killed the people and sent his son Jiro to fight the dragon. When the dragon was defeated, he fled along the river to the place now called Wang Yan Po at the foot of Qingcheng Mountain, and suddenly disappeared.

Jiro took the chain and sat on a big stone to have a rest. At this time, an old woman came and told Jiro that she would give her the chain when she heard that the dragon was not caught.

Soon, a man in yellow came to ask for something to eat. The old woman turned out to be Chen Shan's old mother. She recognized the dragon, so she put the chain in the pot and turned it into noodles for him to eat. After the dragon swallowed the noodles, he knew he was going to kill the old woman, and the old woman told Jiro to catch the dragon together.

First of all, I intend to take the dragon to Chengtou for execution. The old man said to Jiro, "How can we grow crops without dragons spitting water?" Finally, I decided to lock the dragon in the deep pool under the pile. This is the origin of Long Fu Temple and the location of "Cold Pool Crouching Buddha Dragon", one of the ten scenic spots in Guanyang.

Extended data:

Li Bing and his son's water control process;

In the fifty-first year of the Qin Dynasty (256 BC), Li Bing, the prefect of Shu County of Qin State, and his son led the local people and presided over the construction of the famous Dujiangyan water conservancy project on the basis of previous experience in water control.

Dujiangyan's master plan is to divide the Minjiang River into two streams, one of which is introduced into Chengdu Plain, which can not only divert floods and reduce disasters, but also divert water to irrigate farmland and turn harm into benefit. The main projects include Yuzui Fenshui Dike, Sha Fei weir spillway and Baojiangkou water intake. ?

1 construction technology of bottle mouth

First of all, Li Bing and his son invited many farmers with water control experience to inspect the terrain and water source conditions on the spot, and decided to dig through Leiyu Mountain to divert water.

Because gunpowder had not been invented at that time, Li Bing used flint to break the rock, and finally cut a mountain pass with a width of 20 meters, a height of 40 meters and a length of 80 meters in Leiyushan. Because it looks like a bottle mouth, it is named "Baojingkou", and the stone pile separated from Leiyushan is called "Staying Pile".

The reason for repairing the bottle mouth is that only by opening Leiyushan can the water of Minjiang River flow to the east smoothly, reduce the flow of the western rivers, stop the flooding of the western rivers, and alleviate the drought in the east, so that the turbulent rivers can flow into the arid areas and irrigate the fertile fields there. This is the key link of flood control and the first step of Dujiangyan project.

2. Construction technology of water-separating fish mouth

After the completion of Baokou water diversion project, although it has played a role in water diversion and irrigation, it is difficult for the river to flow into Baokou because of the high terrain east of the Yangtze River. In order to make the Minjiang River flow eastward smoothly and maintain a certain flow rate, the flood diversion and irrigation function of Baokou is fully exerted.

Libing, a builder, decided to build a diversion weir on the Minjiang River after digging the bottle mouth, which divided the river into two parts: one part went down the river and the other part was forced to flow into the bottle mouth. Because the front end of the diversion weir looks like a fish head, it is called "fish mouth".

The completion of the fish mouth divides the river flowing upstream into two parts: the west is called Waijiang, which flows down the Minjiang River in the rain; The east is called Neijiang, which flows into the bottle mouth.

Because the Neijiang River is narrow and deep, and the outer river is wide and shallow, the water level is low in the dry season, and 60% of the river water flows into the Neijiang River with a low riverbed, which ensures the production and living water in Chengdu Plain.

When the flood comes, because of the high water level, most of the river water is discharged from the wide outer river. This design of automatic distribution of water inside and outside the river channel is called "four-six water diversion".

3. Construction technology of flying sand weir

In order to further control the amount of water flowing into the bottle mouth, play the role of flood diversion and disaster reduction, and prevent the situation that the amount of water in the irrigation area fluctuates greatly and cannot be kept stable, libing divides water at the tail of Yuzui dike.

Near the mouth of Baokou, a flat flume and a "flying sand weir" spillway were built to divert the flood, ensuring that Neijiang was disaster-free. A bend was built in front of the spillway, and the river formed a circulation.

When the river exceeds the crest of the weir, the sediment and stones carried by the flood will flow into the outer river, so as not to block the waterways of Neijiang and Baojiangkou, hence the name "Sha Fei Weir".

The flying sand weir is made of pebbles in bamboo cages, and the height of the weir top is suitable to regulate the water quantity. When the water level in Neijiang is too high, the flood will overflow the flying sand weir and flow into the outer river through the flat flume, so that the amount of water entering the bottle mouth will not be too large, and the Neijiang irrigation area will not be attacked by the flood.

At the same time, the aquatic products that crossed the Sha Fei weir and flowed into Waijiang created a swimming vortex. Due to centrifugation, mud and even boulders will be thrown over the Sha Fei weir, so it can effectively reduce the sediment deposition around the bottle mouth.

In order to observe and control the water quantity in Neijiang, Li Bing carved three portraits of stone piles and put them in the water to determine the water level. Stone horses are also chiseled and placed in the middle of the river, which is used as the standard for scouring the beach at the minimum water volume every year.

Under the leadership of Li Bing, people overcame many difficulties. After eight years of hard work, this historical project-Dujiangyan was finally built.

Baidu Encyclopedia-Li Bing

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