Jiro took the chain and sat on a big stone to have a rest. At this time, an old woman came. She heard that the dragon was not caught and told Jiro to give her the chain.
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, "If not, 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 it is also 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 and his son, the prefect of Shu County, absorbed the experience of predecessors in water control and led the local people to build the world-famous Dujiangyan water conservancy project.
Dujiangyan's master plan is to divide the Minjiang River into two branches, 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 works include Yuzui diversion 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 experience in water control, surveyed the terrain and water conditions on the spot, and decided to cut through Leiyushan to divert water.
Because gunpowder had not been invented at that time, Li Bing used flint to burst 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 its shape resembles the bottle mouth, it is named "Treasure Bottle Mouth", and the stone pile separated from Leiyushan is called "Remaining Pile".
The reason for repairing the bottle mouth is that only by opening Leiyushan and letting the water of Minjiang River flow eastward smoothly can the flow of the river in the west be reduced, so that the river in the west will no longer flood, and at the same time, the drought in the east can be alleviated, so that the surging river can flow into the arid area 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, the builder, decided to build a diversion weir on the Minjiang River after digging the bottle mouth, and divided the river into two parts, one of which flowed down the river and the other forced 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 came, because of the high water level, most of the river water was 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, give play to the role of flood diversion and disaster reduction, and prevent the fluctuation and instability of the water volume in the irrigation area, libing is located at the tail of the Yuzui diversion levee.
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 top of the weir is at a suitable height, which plays a role in regulating 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 be protected from 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, thus effectively reducing the sediment deposition around the bottle mouth.
In order to observe and control the water quantity in Neijiang, Li Bing carved the portraits of three stone piles and put them into the water to determine the water level. Stone horses are also chiseled and placed in the middle of the river as a standard for scouring the beach when the water quantity is the least every year.
Under the leadership of Li Bing, people overcame many difficulties, and after eight years of hard work, this historical project-Dujiangyan was finally built.
Baidu Encyclopedia-Li Bing
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