Which valley is Dujiangyan in?

Edit the introduction of this paragraph.

One of the oldest water conservancy projects in the world. Located in Dujiangyan City, Sichuan Province, the middle reaches of Minjiang River. Also known as Hundred Weirs, Tail Weirs and Golden Embankments. Founded in 250 BC, it was officially named Dujiangyan in 1335. Now it is a national key cultural relics protection unit. The head of the canal is in guanxian, including four major projects, namely, Yu Zui, Jingang Dike, Sha Fei Weir and Baojiangkou, with thousands of canals and weirs. When the Minjiang River flows to the foot of Lei Yu Mountain, it is divided into two tributaries by the "Yu Zui" project. The south side is called Waijiang, which is the main stream of the Minjiang River, mainly for flood discharge and irrigation. To the north is Neijiang, also known as Dujiangyan, which is about 160 km long and mainly irrigates farmland. Its downstream tributaries include Zouma River, Baitiao River and Puyang River. Part of the tail water of Zouma River and Baitiao River flows into Fuhe River in the south of Chengdu, and then flows back to Minjiang River. Behind the fish mouth is the internal and external "King Kong Dike" made of huge pebbles, which is integrated with the fish mouth and is the main part of the water diversion project. Behind the "Jingang Dike" is the "flying sand weir", which is mainly used for flood discharge and sediment discharge, so as to keep an appropriate amount of water in Neijiang. Behind the weir is a huge cliff with piles left, and under the cliff is the "Treasure Bottle Mouth" project. Dujiangyan was built by the working people in ancient China by using the natural terrain conditions that the river trend is perpendicular to the contour line on the Chengdu Plain. After the founding of New China, Dujiangyan Irrigation Area Project was completely rebuilt and expanded, which made the irrigation area rapidly expand from the original 14 counties and cities173,000 hectares of farmland to 573,000 hectares of farmland in 30 counties and cities.

Dujiangyan is located in the west of Dujiangyan City, Sichuan Province, on the Minjiang River in the west of Chengdu Plain. Dujiangyan water conservancy project, which was built in 256 BC, is the oldest and only grand water conservancy project in the world. Its characteristic is that no dam is built to divert water. It is a national key cultural relics protection unit. Dujiangyan has beautiful scenery and many cultural relics, including Fulongguan, Erwang Temple, Anlan Suoqiao, Yuleiguan, Lidui Park, Yuleishan Park and Lingyan Temple.

Dujiangyan Water Conservancy Project consists of three main projects: Yuzui Fenshui Dike, Feishayan Spillway and Baojiangkou Water Intake, as well as auxiliary projects such as Baizhang Dike and herringbone Dike. Scientifically solved the problems of automatic river diversion, automatic sediment discharge and inflow control, eliminated floods, and made the western Sichuan plain a "land of abundance" with people following floods and droughts. For more than two thousand years, it has been playing the role of flood control and irrigation. By the end of 1998, the irrigated area of Dujiangyan has reached more than 40 counties, with an irrigated area of 668,700 hectares.

Yu Zui is a diversion dam built in the middle of the river, which divides the turbulent Minjiang River into an outer river and an inner river. Flood discharge from the outer river and irrigation from the inner river. The flying sand weir plays the role of flood discharge and sediment discharge and water transfer. Treasure bottle mouth controls water inflow, because the mouth looks like a bottleneck, it is called treasure bottle mouth. The inland river flows into the irrigated farmland in the western Sichuan plain through the bottle mouth. The part of the mountain cut from Leiyu Mountain is called "leaving a heap".

Dujiangyan Water Conservancy Project makes full use of the local geographical conditions of high northwest and low southeast, and according to the special topography, water veins and water potential of the river outlet, it takes advantage of the situation, does not build a dam to take water, and irrigates by gravity, so as to achieve the interdependence of dike, water diversion, flood discharge, sediment discharge and flow control, and give full play to the comprehensive benefits of flood control, irrigation, water delivery and social water use. After the completion of Dujiangyan, Chengdu Plain is fertile for thousands of miles. "Floods and droughts come from people, and there is no famine, so it is called abundance." Sichuan's economy and culture have made great progress. Its biggest point is that the weir has been built for more than two thousand years, and it is playing an increasingly important role. The establishment of Dujiangyan is based on the premise of not destroying natural resources and making full use of natural resources to serve mankind, turning harm into benefit, and making people, land and water highly coordinated and unified.

Dujiangyan project still exists today, and it is still in operation. With the development of science and technology and the expansion of irrigation area, since 1936, concrete mortar pebble technology has been gradually used to repair and strengthen the canal head, and some water conservancy facilities have been added. The project layout of the ancient weir and the water control strategies such as "deep scouring the beach and low weir", "making use of the situation to guide and adapt to the times", "cutting corners when encountering the bay, and pumping the heart when encountering the power" have not changed, and Dujiangyan water conservancy has not changed either. After carefully watching the design of the whole project, water conservancy experts were amazed at its high scientific level. For example, the design of flying sand weir is a good use of swirl theory. This kind of weir can divert water for irrigation at ordinary times, and it can be discharged into the outer river during flood. It also has the function of discharging sand and gravel, and sometimes very large stones can be rolled out of the weir. At that time, there was no cement, so such a large project used local materials and used pebbles in bamboo cages as weirs, which saved costs and achieved remarkable results.

Dujiangyan has beautiful scenery and many places of interest, and it is also an ideal tourist destination. Dujiangyan area has Erwang Temple, Fulongguan, An Lan Suoqiao and other places of interest.

Erwang Temple is located on the hillside on the right bank of Minjiang River, in front of Dujiangyan. Originally a memorial hall for the King of Shu, it was renamed "Chongde Hall" because Qi Jianwu (AD 494-498) offered sacrifices to Li Bing and his son. After the Song Dynasty (AD 960 ~ 1279), Li Bing and his son were successively crowned as kings by the emperor, so people later called it the "Two Kings Temple". There are statues of Li Bing and his son in the main hall of the temple, and there are famous sayings about water control and inscriptions by poets.

Fulongguan is located in Lidui Park. Legend has it that Li Bing descended the dragon here when he was controlling the water. There are three existing halls, and the front hall has a statue of Li Bingshi in the Eastern Han Dynasty (AD 25-220). There are also the ruins of the Eastern Han Dynasty weir stone tripod, and the scene when the sages and princesses in the Tang Dynasty became monks in Qingcheng Mountain.

An Lan Lock Bridge is also called "An Lan Bridge" and "Lovers Bridge". It was built before the Song Dynasty. Located above the fish mouth of Dujiangyan, it is known as the "five ancient bridges in China" and is the most distinctive landscape of Dujiangyan. The cable bridge is supported by wooden rafts and stone piers, suspended by thick bamboo cables, paved with wooden boards and surrounded by bamboo cables on both sides, with a total length of about 500 meters. In the late Ming Dynasty (17th century), it was destroyed by war. The present bridge is a steel cable concrete pile.

Dujiangyan is not only a world-famous ancient water conservancy project in China, but also a famous scenic spot. 1982, Dujiangyan, as an important part of Qingchengshan-Dujiangyan scenic spot in Sichuan, was approved by the State Council to be included in the first batch of national scenic spots. On May 8, 2007, Chengdu Qingchengshan-Dujiangyan Scenic Spot was officially approved by the National Tourism Administration as a national 5A-level scenic spot.

According to the definition of cultural heritage in the second paragraph of Article 1 of the United Nations Convention for the Protection of the World Cultural and Natural Heritage: "Architecture: a single or connected architectural group with outstanding universal value in terms of architectural style, uniform distribution or combination with environmental scenery from a historical, artistic or scientific point of view". Dujiangyan water conservancy project has a long history, huge scale, reasonable layout, scientific operation and harmonious combination with the environment, which has outstanding historical and scientific universal value. Dujiangyan was identified as a world cultural heritage at the 24th session of the United Nations World Heritage Committee in 2000.

Edit the source of this paragraph name.

In the early days when Li Bing, the magistrate of Qin and Shu counties, built the weir, Dujiangyan was named "Kui" because Leiyushan next to Dujiangyan was called "Kui Mountain" before Qin and Han Dynasties, and the main ethnic groups living around Dujiangyan at that time were people, who called the weir "Gui" and Dujiangyan was called "Kui".

During the Shu and Han Dynasties in the Three Kingdoms, Du 'an County was established in Dujiangyan, which was named "Du 'an Weir". At the same time, it is also called "golden dike", which highlights the water diversion function of fish mouth and uses dike instead of weir as its name.

In the Tang Dynasty, Dujiangyan was renamed "Jueweiyan". Because the materials and methods of embankment construction at that time were mainly "broken bamboo as a cage, with a diameter of three feet, filled with solid stone, which was called" tail ".

It was not until the Song Dynasty that Dujiangyan was mentioned for the first time in the history of the Song Dynasty: "Yongkang army ruled Dujiangyan at the age of 20, and the cage stone snake broke the river and stopped water to irrigate several counties."

Why is Dujiangyan called Dujianghe? "Shu Shui Kao" said: "Fu River, a Chengdu River, has two sources, namely Lijiang River and Liujiang River." Liu Jiang is another name for Jian Jiang. On the Chengdu Plain, the Fuhe River is Yongjiang River and the Nanhe River is Jianjiang River. Their upper reaches are Baitiao River and Zouma River, which are divided into Dujiangyan and Neijiang. "National Records" said: "Du Jiang is the river of Chengdu". Since the Song Dynasty, the whole Dujiangyan water conservancy system project has been generally called Dujiangyan, which accurately represents the whole water conservancy system and has been used ever since.

Edit the construction process of this section.

Minjiang River is a large tributary of the upper reaches of the Yangtze River, which originated in the mountainous areas of northern Sichuan. Whenever flash floods occur in spring and summer, the river will run down and enter the Chengdu Plain from guanxian. Due to the narrow rivers, floods often occurred in ancient times. When the flood recedes, it is a thousand miles of sand. However, Leiyushan, located on the east bank of Minjiang River in guanxian, blocked the eastward flow of Minjiang River, resulting in drought in the east and flooding in the west.

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.

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".

After the completion of the water diversion project in Baokou, 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 in Jiangdong. Li Bing and his son led the crowd to build a diversion weir in the upper reaches of Minjiang River and the middle of the river not far from Leiyushan, and put a big bamboo cage filled with pebbles in the middle of the river to form a narrow island shaped like a fish mouth. The fish mouth divides the turbulent Minjiang River into an outer river and an inner river. The outer river discharges flood, and the inland river flows into Chengdu Plain through the bottle mouth.

In order to further play the role of flood diversion and disaster reduction, a 200-meter-long spillway was built between the diversion weir and the dump, which flowed into the Waijiang River to ensure 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 other rivers, so as not to block the waterways of Neijiang and Baojiangkou, hence the name "Sha Fei Weir".

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.

Edit this paragraph: Li Bing and his son

Statues of Dujiangyan, Li Bing and his son were built in 256 BC. It was a large-scale water conservancy project built by Li Bing, the prefect of Shu County of Qin State in China during the Warring States Period. It is the oldest and only preserved water conservancy project in the world, which is characterized by not building a dam to divert water. For more than 2200 years, it still plays a huge role. Li Bing's water control is a great masterpiece of the civilized world and a great water conservancy project that benefits the people. Chengdu Plain can be so rich, known as the "Tianfu" paradise, which is fundamentally the result of Li Bing's creation of Dujiangyan. Therefore, the history books record: "The completion of Dujiangyan has made the Chengdu Plain" dependent on floods and droughts, and there is no famine, which is called' Tianfu' in the world ".

For more than 2,000 years, Li Bing and his son dug piles, opened weirs and repaired canals, bringing blessings to the land of abundance, which has always been revered and appreciated by the world. The Erwang Temple is not only full of incense, but also has official and folk sacrificial activities in history. Formed a temple fair centered on Li Bing and his son on June 24 and June 26 of the lunar calendar every year.

Edit the construction reason of this part.

1, why do you want to repair the bottle mouth?

As long as Leiyu Mountain is opened, the water of Minjiang River can flow eastward smoothly, which can not only reduce the flow of river water in the west, but also alleviate the drought in the east, so that the turbulent river water 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. The rock in Leiyushan is hard, and migrant workers use iron tools to chisel, dig and pry, so the progress of the project is extremely slow. Later, an experienced old migrant worker suggested to cut some grooves in the rock and then put firewood on it to ignite it. The rock will burst under the burning of firewood, which can speed up the excavation. Practice has proved that this method is very effective. After a period of hard work, a hole 20 meters wide, 40 meters high and 80 meters long was finally dug in Lei Yu. Because it looks like a bottle mouth, it is called a "treasure bottle mouth". The flowing Minjiang River water continuously flows to the eastern dry area through the bottle mouth, so that the farmland in the east is irrigated. The first major project in Dujiangyan was finally completed.

After the completion of the water diversion project in Baokou Port, although it has played a role in water diversion and irrigation, it is difficult for the river to flow into Fangkou because of the high terrain in Jiangdong. How can we make more water flow eastward into Baokou Port? Thereby causing the fish mouth to be trimmed.

2. Why do you want to repair the fish mouth?

In order to facilitate the smooth eastward flow of Minjiang River and maintain a certain flow rate, and give full play to the flood diversion and irrigation function of Baokou Port, after digging Baokou Port, Li Bing decided to build a diversion weir on Minjiang River to divide the river into two streams: one downstream and the other forcibly flowing into Baokou Port. It is a very difficult project to build a diversion weir in the middle of the river, because the water in the middle of the river is high and turbulent, and the water is fast. The weir body built is very strong, otherwise it will be washed away by the flood at any time. When they started to build the diversion weir, they used the method of throwing stones into the middle of the river, but the result was unsuccessful. Because, the stones thrown down can't stand the impact of the flood and are constantly washed away by the flood. What shall we do? There are many bamboos in Minshan area, and the way local people build houses and weave bamboo cages to hold things has greatly inspired Li Bing. He invited many bamboo workers to weave large bamboo cages 3 feet long and 2 feet wide, filled with pebbles, and then let migrant workers sink the heavy bamboo cages to the bottom of the river one by one. As a result, the bamboo cage was motionless in the rushing water, firmly fixed there, reinforced with big stones around it, and finally built a water diversion and water lifting. Because the big lead end is shaped 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, and the river flows through large and small rivers, forming a crisscross irrigation network. Since then, floods and droughts have rarely occurred in Chengdu Plain, and the method of intercepting water with pebbles in bamboo cages has been used to this day.

3. Why build the flying sand weir?

In order to further control the amount of water flowing into the bottle mouth and prevent the fluctuation and instability of the water in the irrigation area, Li Bing built a flat water tank and a "flying sand weir" spillway at the tail of the Yuzui diversion levee next to the bottle mouth for flood diversion. The flying sand weir is also 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 sink, so that the amount of water entering the bottle mouth of the room will not be too large, and the Neijiang irrigation area will be protected from floods; At the same time, because the water flowing into the outer river across the flying sand weir produces swimming vortex, it can also effectively reduce the sediment deposition around the bottle mouth. At this point, Dujiangyan project has been basically completed.

Edit this historical event

Li Bing created Dujiangyan.

During Li Bing's garrison in Shu County in the late period of the King (about 276 BC-25 BC1year), on the basis of in-depth investigation and summary of previous experiences in water control, he carefully selected the mountain pass on the upper reaches of Minjiang River, the apex of Chengdu Plain, as the site of the project, United and organized the people of all ethnic groups in West Shu, and finally built Dujiangyan around 256 BC after hard struggle. Practice has proved that Dujiangyan water conservancy project, which has enjoyed lasting benefits for more than 2000 years, has a superior and reasonable geographical location and its layout conforms to the laws of nature. The three major projects, namely diversion levee, spillway and Baokoukou, restrict and complement each other, and jointly play an important role in water diversion, flood diversion and sediment discharge. Dujiangyan still plays a great role today.

Sima Qian visited Dujiangyan

In the sixth year of Ding Yuan, Emperor Wu of the Han Dynasty (BC 165438+ BC 0 1), Sima Qian was ordered to visit Dujiangyan in the southwest. He recorded Li Bing's contribution to the creation of Dujiangyan in Historical Records of Rivers and Channels. Later generations built the West Station Pavilion and the West Station Hall in Minshan Mountain, which stretches to the west, as a memorial.

Zhang Ling preached Qingcheng Mountain.

When Emperor Shun was in the Eastern Han Dynasty (A.D. 126 ~ 144), Zhang Ling went from Luoyang to Qinling and practiced in Hemingshan. On July 1st, the second year of Han 'an (AD 143), he led his disciples to preach in Qingcheng Mountain. /kloc-preached in Qingcheng mountain in 0/3, and Emperor Huan of Han lived for two years (A.D. 156) and was buried in Qingcheng mountain. Qingcheng Mountain has become the birthplace of Taoism in Shi Tian, and Long Island Temple is known as "the magic of fairy capital, the prosperity of blessed land, and the birth of Zhang Tianshi". Shi Tian from Longhu Mountain in the past dynasties came to Qingcheng Mountain to pay homage to his ancestors and visit Zhang Ling, Shi Tian, in the Han Dynasty.

Zhuge Liang deployed to protect the weir.

In the sixth year of Jian Xing in Shu and Han Dynasties (AD 228), Zhuge Liang made a northern expedition, took Dujiangyan as the foundation of agriculture and an important pillar of national economic development, recruited 1.200 soldiers to guard it, and set up full-time weir officials for regular management and maintenance. This is the first time for later generations to set up full-time water conservancy officials to manage Dujiangyan.

Kyle Poirot went to Dujiangyan.

In the first year of Yuan Shizu to Zhengzheng (A.D. 1264 ~ 1294), Italian traveler Kelpolo rode from Hanzhong, Shaanxi, and arrived in Chengdu for more than 20 days, and visited Dujiangyan. Later, in Marco Polo's Travels, he said: "Du Jiang River system, the river is very urgent, there are many fish in the river, and there are many ships coming and going, carrying commercial goods, upstream and downstream."

Richthofen inspected Dujiangyan.

During the Tongzhi period of Qing Dynasty (A.D. 1862 ~ 1874), German geographer Richthofen (Richthofen 1833- 1905) visited Dujiangyan and praised the perfection of irrigation methods in Dujiangyan with expert eyes, which was unparalleled in the world. 1872 set up a special chapter on Dujiangyan in Baron Richthofen's letter. Richthofen was the first person to introduce Dujiangyan to the world in detail. 1872, Richthofen praised "Dujiangyan irrigation method is perfect, chinese odyssey".

Build irrigation roads

The Chengdu-guanxian Highway 19 13 started, and the 2km "Demonstration Road" from one end of guanxian stopped. 1923, the governor of Sichuan province, Lin Huoliang Qing, took the post of general manager, and changed the official office into a joint venture between government and business. 1925 was fully connected, and 1926+0 was opened to traffic. This is the first expressway in Sichuan Province.

Establish a joint venture

19 19 ~ 1920, Yao Baoshan, a native of guanxian, gathered business people in the province after leaving office as county magistrate Xiaojin, and set up a logging company with French Christian pastor Xie. Based in guanxian, the company cut down mountain trees in Lifan (now Lixian County, Aba Prefecture) and other places, processed them into squares, floated into the Minjiang River through a small ditch, collected them in Zipingpu, guanxian, and then tied them into rafts, which were sold by water in Chengdu, with rich profits. This is the first Sino-foreign joint venture in Dujiangyan. ?

Diexi flood

1On August 25th, 933, an earthquake of magnitude 7.5 occurred in Diexi, Maoxian County, the upper reaches of Minjiang River, and rocks collapsed, crossing Minjiang River and its tributaries. 654381October 9, 45 days after the Minjiang River was cut off, Xiaohaizi, the main stream, burst its mouth and accumulated water poured down. 10 6 10/day 10, the flood entered Dujiangyan City, with a peak flow of about10200m3/s, which destroyed the water conservancy projects and the Anlansuo Bridge in Dujiangyan. The rivers inside and outside are one, and Wang Yang is boundless. 16 townships were affected, destroying farmland 1 0,000 hectares and killing more than 5,000 people. Ziping and Baisha along the Minjiang River 1000 cubic meters of wood, 1000 tons of coal and medicinal materials have all been washed away. Houses, bridges and mills along the lower reaches of Dujiangyan were destroyed, and more than10,000 people were displaced. ?

Huang Yanpei runs a school in Dujiangyan.

194 1 year, Huang Yanpei went to Dujiangyan and chose Fengdu Temple in the eastern suburb of the city as the school site. The following summer vacation, Lu Shuang, president of Chongqing Vocational School, was ordered to purchase paddy fields, cattle and farm tools in guanxian to prepare conditions for teaching practice. 1February, 944, "Du Jiang Practical Vocational School" was opened, with Shen as the principal and Mrs. Huang Yanpei Yao presiding over the opening ceremony in guanxian, and personally formulated the school motto of "seeking truth from facts, keeping promises and stressing practical results". The school advocates the style of study of "using both hands and thinking with both hands" and pays attention to the cultivation of students' ideological cultivation, cultural knowledge and production skills. The school established a board of directors, with Huang Yanpei as the chairman. After the victory of War of Resistance against Japanese Aggression, the school was handed over to guanxian in June 1945+00. ?

Lin Sen presided over the water boiling ceremony in Dujiangyan.

1942 In Tomb-Sweeping Day, officials from Sichuan provincial government and irrigation county 14 gathered in Dujiangyan to hold a water-boiling ceremony, which was presided over by Lin Sen, chairman of the National Government who lived in guanxian at that time. Before opening the weir, Li Bing offered sacrifices in Fulongguan and worshipped the statue of Li Bing. After the sacrifice, Lin Sen and his entourage took a sedan chair and went straight to Erwang Temple to worship Erlang. After the ceremony, Lin Sen and his entourage went to the fish mouth of Dujiangyan, where they watched the weir open and released water amid firecrackers and cheers.

Feng Yuxiang donated money to build a pavilion

194 1, 1942, 1945, Feng Yuxiang, vice chairman of the Military Commission of the National Government, lived in guanxian and Qingcheng Mountain for many times. On the eve of War of Resistance against Japanese Aggression's victory, Feng Yuxiang lived in Zhenwu Palace in Qingcheng Mountain. On the morning of August 1945,1/KLOC-0, he heard the news of the victory of the Anti-Japanese War and the Japanese surrender, and immediately donated money to build a pavilion on the edge of Zhenwu Palace, named "Wen Sheng", and wrote a book and carved a monument to stand in the pavilion.

The People's Liberation Army restored Dujiangyan.

1949, China People's Liberation Army marched into Sichuan. After entering Sichuan, Commander He Long pointed out that Dujiangyan should be repaired first to win back the time lost in the annual repair. And decided to allocate special funds from the military, decided by Wang Xifu, assisted by the People's Liberation Army stationed in guanxian. On February 29th, 65438, the temporary supervision and repair office of Dujiangyan Annual Repair Project was established. Chengdu Arms Control Commission allocated 30,000 silver dollars for emergency repair. More than 500 people from the People's Liberation Army184th Division/KLOC-0 in guanxian participated in the emergency repair project under the command of the division commander and political commissar Liang. The whole annual maintenance project was completed at the end of March 1950. On April 2nd, according to the traditional custom of Dujiangyan, a ceremony of boiling water was held. ?

Dujiangyan 2250th Anniversary Celebration.

1On April 5, 1994, the "Celebration Meeting of the 2250th Anniversary of Dujiangyan Dam Building in China" hosted by Sichuan Provincial Government and Ministry of Water Resources, and undertaken by Chengdu Municipal Government, Dujiangyan Municipal Government and Dujiangyan Administration Bureau was held at the head of Dujiangyan Canal. Sixty-nine delegations from the United States, Canada, Japan, Singapore and other countries and regions attended the meeting to congratulate and participate in the celebration. Participants remembered the great achievements of Li Bing and his son, and praised Dujiangyan Irrigation District for its development from 6,543.8+0.9 million hectares in 1950s to more than 670,000 hectares, making it the largest irrigation district in China and a water conservancy project with great benefits. During the commemorative activities, participants watched dances with ethnic and regional cultural characteristics, ancient sacrificial ceremonies, and cutting and releasing water.

No damage was seen after the Wenchuan earthquake.

On May 2, 2008 14: 28, an earthquake of magnitude 8.0 occurred in Wenchuan County, Sichuan Province (3 1 degree north latitude and 0/03.4 degree east longitude). Dujiangyan is one of the areas closest to the epicenter of the earthquake. According to the staff of Dujiangyan Scenic Area, there are no signs of damage to Dujiangyan water conservancy project.

I've been editing this paragraph for a long time.

Dujiangyan water conservancy project. After 2260 years, it is a grand water conservancy project with a long history, and it is also the only one left in the world. It is characterized by water diversion without dams. It is the most successful water conservancy masterpiece in the ancient history of China, and it is also the only miracle that ancient water conservancy projects have been used up to now. The irrigation systems in ancient Egypt and Babylon, as well as the Lingqu in Zheng Guoqu, China, Guangxi and Shaanxi, which were built almost at the same time, were lost or failed due to the changes of the ocean and the passage of time. Only Dujiangyan is unique and has a long history of construction, which still nourishes the fertile soil of the land of abundance.

Dujiangyan makes full use of the local geographical conditions of high northwest and low southeast. According to the special topography, water vein and water potential at the outlet of the river, it makes use of the situation, draws water without dam and irrigates by gravity, which makes dikes, water diversion, flood discharge, sediment discharge and flow control interdependent and ensures the full play of the comprehensive benefits of flood control, irrigation, water conveyance and social water use. Its biggest point is that the weir has been built for more than 2250 years, and it is playing an increasingly important role. The establishment of Dujiangyan is based on the premise of not destroying natural resources and making full use of natural resources to serve mankind, turning harm into benefit, and making people, land and water highly coordinated and unified. It is the only great "ecological project" in the world so far. It initiated a new era in the history of ancient water conservancy in China, marked a new stage in the history of water conservancy in China and wrote a glorious chapter in the history of water conservancy in the world. Dujiangyan Water Conservancy Project is the crystallization of ancient people's wisdom in China and an epoch-making masterpiece of Chinese culture.

Dujiangyan, founded by Li Bing, correctly handled the relationship between the main projects such as Yu Zui Fenshui levee, Sha Fei weir spillway and Baojiangkou water intake, making them interdependent, complementary in function, skillfully coordinated and integrated into a whole, forming a systematic project with reasonable layout, and jointly playing the important roles of water and sediment regulation, flood discharge and sediment discharge, water diversion and dredging, ensuring that there is no shortage of dry water and no flood. Dujiangyan scientifically solved the problems of automatic river diversion, automatic sediment discharge and control of incoming water, and eliminated floods. Specifically, the fish mouth diversion dike is used to divert water from Mianjiang River for irrigation. In dry season, 60% of the water in Mianjiang River is automatically introduced into Neijiang and 40% is discharged into Waijiang River. In the event of a flood, 60% of the water is automatically discharged into the Waijiang River and 40% is introduced into Neijiang River. Dujiangyan was built at the corner of Mianjiang River, which reached Dujiangyan. The surface water with less sediment concentration flows to the concave bank, and the bottom water with more sediment concentration flows to the convex bank, which discharges most of the sediment washed down from the outer river by the flood. A small amount of sand and gravel entering Neijiang, with the support of Hutouyan extending to the center of the river, the restraint of Baojoukou and the jacking of "retaining piles", will discharge most of the sand and gravel from Feishayan and herringbone dike into the outer river to prevent the water intake of Baojoukou and the main stream of the irrigation area from silting; Using the water intake of bottle mouth to control the inflow not only ensures the irrigation water, but also avoids the flood from flooding into Neijiang irrigation area and causing disasters. Dujiangyan can automatically adjust the amount of water entering the irrigation area, making the Chengdu Plain "flood and drought follow people" and become a granary of Tianfu. Dujiangyan is a model of automatic water diversion, flood discharge and sediment discharge by successfully using the fluid gravity formed by natural bends. When building the weir, Li Bing also buried a stone horse in the river as a sign of scouring the beach, and set up a "Three Stone Man" to observe the fluctuation of water regime, which pioneered the ancient water regime measurement in China. All previous dynasties attached great importance to Dujiangyan water conservancy project, gradually improved the management organization, established the annual maintenance and flood control maintenance system, and accumulated and summarized valuable water control experience such as "six-character formula", "three-character classics" and "eight-character motto", which made the ancient weir develop continuously.

Dujiangyan founded by Li Bing is a scientific, complete, huge and potential water conservancy project system. It is a wonderful water conservancy project that benefits Huize now and in the future, and it is a model of regional water conservancy networking. Later, a number of historical buildings, such as Lingqu, Tashan Weir, Yuliangba and Daicunba, were marked with Dujiangyan. Its engineering structure is mainly composed of canal head engineering, ancillary engineering and irrigation canal system engineering. The canal head project is mainly composed of fish mouth, flying sand weir and treasure bottle mouth; The ancillary works consist of Baizhang dike and herringbone overflow weir; The canal system project is mainly composed of Neijiang main canal, Shahe main canal and Jinma River main canal. After the establishment of People's Republic of China (PRC), an industrial diversion culvert was specially designed and built to solve the urban water supply problem during the maintenance of Dujiangyan project.

The scientific mystery of Dujiangyan water conservancy project is mainly reflected in the fact that the above three projects have formed a complete large-scale system, and formed the ability of dam-free water diversion, flood diversion, sediment discharge and water diversion irrigation under different water quantities of Minjiang River, which made Chengdu Plain "from people to hunger" and adapted to the needs of social and economic development at that time. After liberation, the functions of water storage and underground water supply were added, which fully expanded the scientific and economic connotation of Dujiangyan project and adapted to the needs of modern economic development.

During the development of Dujiangyan established by Li Bing, the industrious and intelligent people in western Sichuan correctly handled various contradictions, such as water diversion and flood discharge, water diversion and irrigation, sediment discharge from low weir, operation and maintenance, etc. Relying on natural conditions and making full use of engineering technology, they solved various problems and accumulated extremely rich experience in water control. The six-character formula of "deep scouring beach and low weir" and the old and new versions of "three-character classics" left a systematic, complete and very specific experience in water control. Studying and popularizing Dujiangyan's experience seriously is still of great significance for harnessing the Yellow River, solving the water problem in Shandong, speeding up the construction of water conservancy network, giving play to the natural geographical advantages of our province and even the whole country, and optimizing the ecological environment.

In view of the characteristics and contradictions of the suspended river between Minjiang River and Chengdu Plain, Dujiangyan Water Conservancy Project gives full play to the characteristics of self-regulation of water volume, avoidance of height and circulation in bends, and "guides the situation and adapts it to the time", correctly handles the contradiction between the suspended river and Chengdu Plain, unifies it into a large engineering system, and turns water disasters into water conservancy. Specifically, the "three major projects" at the head of the canal are cleverly constructed in three-dimensional space, the hard constraints of the specific section of the Minjiang River are optimized, the mainstream trend and circulation intensity are formed under different discharge conditions, and the water and sediment distribution ratios of the rivers inside and outside the Minjiang River are different under different discharge conditions, thus overcoming the natural geographical disadvantages of western Sichuan, optimizing the relationship between the Minjiang River and Chengdu Plain, and developing water conservancy networking are most conducive to the stable and sustainable development of the local economy. The relationship of its three-dimensional space is: plane layout is the foundation and premise; The facade structure is gradually formed on the basis of plane layout through repeated optimization for thousands of years.

More than 2,000 years ago, Dujiangyan made such a great scientific achievement, which is unique in the world and is still the highest water conservancy project in the world. 1872, German geographer Richthofen (Richthofen 1833- 1905) praised "the perfection of Dujiangyan irrigation method is unparalleled in the world". During the period of 1986, Franjem, Secretary General of the International Irrigation and Drainage Committee, and experts from all over the world from the International River Sediment Society visited Dujiangyan and spoke highly of Dujiangyan's scientific irrigation and sediment discharge functions. 11In March, 1999, UN-HABITAT officials visited Dujiangyan and suggested that Dujiangyan Water Conservancy Project participate in the 2000 UN "Best Water Resources Utilization and Treatment Award".

Quoted from Baidu Encyclopedia "Dujiangyan" entry.