Shock Dujiangyan

Before I arrived in Dujiangyan, I imagined that there were stone dams that had experienced more than 2,000 years of wind, rain and sun. The banks were overgrown with weeds and the river was turbid and swift. After I arrived, I found that Dujiangyan still exudes youthful vitality, and what greeted me was full of shock.

I want to blame the tour guide first, and I have repeatedly stressed that don't take pictures when you go, but take pictures when you come back. As a result, I came back in a hurry and took few photos. And the principle of Dujiangyan. I went home and looked it up online for two hours before I basically understood it. Fortunately, I am a good student who loves to study. Otherwise Dujiangyan will go for nothing. However, you really want to find a tour guide here, and no one can explain it, let alone explain it. ?

? The car stopped far away from the scenic spot, and we were greeted by towering green hills, blue sky, white clouds and rows of neat antique buildings with cornices and corners. Walking through Happiness Avenue, Fatong on both sides of the road stretched out their bent arms to form a thick shade. At the end of the street is the South Bridge, an ancient covered bridge with carved beams and painted columns, which is colorful and beautiful. The swift river brought a cool breeze and drove away the annoying summer heat, and the bridge was crowded with people enjoying the cool. The scenery of the South Bridge is more beautiful at night, and the cooperation of light, water and shadow often brings a beautiful visual feast to people. ?

The entrance to the scenic spot is Lidui Park, which is actually a park built by rocks separated from Leiyushan when digging Neijiang. Shortly after entering the park, the tour guide led us to stop by a fountain, where we saw Dujiangyan's "Three Treasures of Water Control". Lying iron is four iron pillars, and the depth buried at the bottom of the river determines the depth of sand cleaning every year. I used to be a stone man, but later I changed to a lying iron. Bamboo cages filled with pebbles were put into the river to intercept the water. Big Mazar, fixed bamboo cage. These seemingly insignificant things play an irreplaceable role. ?

There are many precious golden nanmu trees and a ginkgo tree in the garden, which is said to have been planted by Zhang Song when he presented flowers to Liu Bei in the Romance of the Three Kingdoms. It has been over 1700 years, and it is still developing vigorously. In addition, in the old version of Journey to the West, the Monkey King stole ginseng fruit, which was taken with this tree. Is it true that ebony can still be seen in the garden I'm not afraid of being ripped off. ?

? After swimming in Fulongguan, we have to cross a cable bridge to the other side of the river. The bridge is shaking badly. If you dare to take a step at the guardrail, you naturally dare not take pictures. If you drop your mobile phone, it will be swept away by the river. Later, I found that the Anlansuo Bridge next to Yu Zui is one of the five ancient bridges in the world, and it is also a famous love bridge. Unfortunately, I just looked at the bridge from a distance. It seems better to go out to play or do your homework. ?

The Minjiang River where Dujiangyan is located is only over 50 kilometers away from Chengdu, with a drop of 273 meters. Once the Minjiang River breaks its banks, Chengdu will be flooded. Therefore, all previous dynasties have made great efforts to control the Minjiang River flood.

? Dujiangyan water conservancy consists of fish mouth, flying sand weir and treasure bottle mouth. These three parts work closely together and are indispensable. In 256 BC, after a long-term investigation, Li Bing and his son built a fishmouth-shaped diversion dam at the bend to discharge flood and sediment. Divide the fast-flowing rivers into Neijiang and Waijiang. Neijiang was excavated manually, which lasted 14 years and led to Chengdu Plain. The outer river is shallow and the inner river is deep; The outer river is wide and the inner river is narrow. During the drought, 60% of the water in Neijiang is outside the river and 40% is outside the river; During the flood, 60% of the river is outside the water and 40% is in Hanoi. Spring, summer, autumn and winter, ensure that there is water in Neijiang, and ensure farmland irrigation. At the same time, according to the characteristics of water flow, most of the sand and stones are taken away by the outer river.

? A small amount of sand and gravel entering Neijiang flows through the flying sand weir, forming a vortex. According to the characteristics of centrifugal force, 98% of the sand and gravel are thrown away, so it is named Feisha weir. The rest of the water flows through the bottle mouth, which looks like a bottle mouth. This is a water outlet that was suddenly dug out of Lei Yu Mountain. There was no gunpowder at that time. Li Bing and his son put wood on the mountain, which took eight years to build. Still valid today.

? Standing at the fish mouth, you can see the Minjiang River rushing down from the upper reaches. An Lan Bridge is covered with red silk. On the green hills on both sides, there are trees and pavilions, which are as beautiful as fairyland.

In retrospect, the Minjiang River was like a fierce monster, devouring the Chengdu Plain, and the people were miserable. Li Bing and his son, like animal trainers, deftly handed it over, making it obediently beneficial to the people and making it a rich "land of abundance". Thousands of years later, it is still writing the miracle of water conservancy, and the myth that Chinese children are not old is flowing!