Many ancient projects are the crystallization of the wisdom of our ancestors, including Dujiangyan. We should learn its scientific planning spirit while worshipping them.
In fact, China's ancient buildings and water conservancy are all right. I think they were born at the beginning of construction, except to meet people's needs. One more thing, the biggest feature of these projects is that they are born with the trend of the times and built naturally. It is also the layout of geomantic omen in Taoism.
If modern architecture in China can consider these things more, it should also leave many solid and practical things for future generations. Just like Dujiangyan, it will be fine after the 52 1 earthquake. The drainage system concept of the Temple of Heaven and the Forbidden City in Beijing far exceeds that of modern urban design and architecture masters.
Because, when people design buildings nowadays, most of them see a point. The ancients saw the whole mountain, the whole city and even the endless nature.
1. After a week of training in Dujiangyan, I finally returned to this plateau town.
After eating, taking a shower, washing clothes, sitting in front of the computer, I can't help but open the document and want to write something. I don't know for what reason or what reason, it just came out of my head. On the screen, I typed this sentence: Dujiangyan, like my hometown.
Of course, I'm not from Dujiangyan or Sichuan, but I feel this way for no reason, and I can't even say it.
I was puzzled and suddenly thought of Su Dongpo's words: My hometown is my comfort zone. This was originally what Dongpo's friend Song Jirounu said when he was demoted to Lingnan Pennsylvania for writing five poems in Wang Dingguo. The question to be answered is whether Lingnan is good or not.
Dujiangyan, an ancient town, is only an hour's drive from downtown Chengdu. But it is the origin of Chengdu and even Sichuan, and enjoys the reputation of a land of abundance. It is because Dujiangyan, an ancient water conservancy project, created the reputation of a land of abundance in Sichuan, so there is also a person named guanxian.
In Dujiangyan in February and October, there is too much rain, which always seems to be insufficient.
When we arrived, it was cloudy after the rain, the ground was wet, and the clouds were pressing against the sky, low and heavy.
Fortunately, these rains always start and stop unconsciously. Most of the time, they are not big. You can't walk far without an umbrella, and it won't be too wet.
The trees on the ground are covered with moss, either gray-green or green. Some of the moss on the tree has grown some seedlings, and some have already blossomed small flowers.
Sichuan Water School adjacent to Dujiangyan Water Conservancy Project is actually called Sichuan Water Conservancy Vocational and Technical College, but people seem to have long been used to its original name.
We are in the newly established Li Bing College of Continuing Education this year. Among the students in our class, there is a Li Bing. He has the same pronunciation as another Li Bing, but the words are different.
A lawn and a simple school gate cut off the noise of the scenic spot. This is an old campus with a history of more than 60 years. Its main function has become to undertake various trainings, and there are not many students here.
Many mottled dormitory buildings, with patches of gray exposed under the crimson background on the walls, are not worn out, but add a heavy feeling. Climbing plants are all over the wall, showing the tenacity of life.
The dense buttonwood trees are all over the roadside, the vigorous branches spread out horizontally, the broad leaves spread out, and the sky overhead is completely covered. On a sunny day, only a few patches of mottled sunshine can be seen. When it rains, the leaves only drop the last lasting raindrops.
The name Dujiangyan is obviously so famous that even I don't know whether I am talking about this water conservancy project or this place without suffix.
In fact, because of my picky and picky habits, I don't like this practice very much. I always feel that it is wonderful to use these three words to call this project. If you add the words water conservancy project, the ancient and heavy charm will be reduced a lot.
I like Qinghai Lake here, but I still like the name without the word "Lake", but because of the local province, I have to change it to my current name. For example, some famous time-honored brands are now hung with limited companies and the like, which is not very beautiful.
This ancient project was built by Li Bing, the prefect of Shu County in Qin State during the Warring States Period. It lasted for more than two thousand years and is still valid now. It is constantly visited by tourists all over the world and worshipped by water conservancy people all over the world.
In fact, to tell the truth, even as a water conservancy person, and I knew its name very early, I still didn't have a deep understanding of it after reading the text about its principle introduction, but after listening to this introduction, I was even more confused.
So I had to find some information to continue my research, and finally I found it. Unfortunately, there are still many mistakes in many introduced videos and articles, which is really a pity.
4. Rivers throughout the ages are mostly curved, and the curved river surface is not horizontal.
In the curved part of the river, as far as the river bank is concerned, the water flow is affected by centrifugal force, and one side of the river is washed inward, which is a concave bank;
On the other side, due to insufficient water flow, sediment deposits and gradually rises, which is the convex bank. Because of this, this straight river becomes more and more curved.
As a result, the water flow is affected, and the water level of concave bank becomes higher and the water level of convex bank becomes lower. Just like when a bicycle turns a corner, both the car and people have to lean to the inside of the corner. The faster the speed, the more serious the tilt.
At the bend, while the surface water flows downstream, it still rolls along the two banks, from convex bank to concave bank, and then from concave bank to underwater convex bank, forming an annular flow.
In this way, the water flow on the concave bank becomes light and clear, the water flow on the convex bank becomes heavy and turbid, and the sediment keeps accumulating on the convex bank.
In Dujiangyan project, the Neijiang River, where the upstream fishmouth is irrigated by water, is just on the concave bank, which naturally attracts clear water. Moreover, the inner river is deep and narrow, and the outer river is wide and shallow, which ensures that the inner river can absorb enough water when there is little water. When there is much water, there will be too much water coming down from the wider outer river, and not too much water coming from Neijiang. This is why the drought is divided into four or six grades.
Although there is less sediment, there is still sediment in the water pumped from Neijiang. Sometimes there is too much water, so there is a flying sand weir and a bottle mouth.
That is, the water extracted from Neijiang is divided into two streams. Because the water level exceeds the flying sand weir, the excess water is discharged from the weir top again. Compared with Sha Fei Weir, the bottle mouth of the treasure is still at the end of the concave bank, which is convenient for discharging sand again. In addition, Baokou is narrower than Neijiang, and rocks collide, so the sediment is either discharged from the Sha Fei weir or piled up in front of the weir, which is dug away every year when dredging. In order to determine the dredging depth, stone horses and ironware are needed. It's all buried underground, which means digging.
I seem to be a picky person, but I'm not picky for the sake of picky. In addition, there are some important things to be clarified.
For example, in Dujiangyan, according to the ratio of 469, some people say that the introduced water is 60% in the off-season and 40% in the peak season, so it can be calculated that the amount of sediment entering the bottle mouth is 5%, while the discharged water is 95%.
However, we didn't take into account that the amount of water and sediment is constantly changing. How can we have such accurate data? The so-called 46% is only the difference between 40% and 60%. This is only a rough approximation, not just the figures of 40% and 60%.
A person who is good at thinking and distinguishing right from wrong needs to learn from the spirit and essence of his predecessors, rather than being rigid and rigid. If so, no matter how well he learns addition, subtraction, multiplication and division.
The greatness of Dujiangyan lies in that Li Bing, like Zheng Guo and others, not only presided over the construction of a great water conservancy project that benefited the people at that time, but also raised the management and maintenance of this project to a very high position, forming a system and tradition, which continued from generation to generation year after year, thus playing a lasting role and continuously benefiting the people downstream.
Today, after 2000, there are still old problems in water conservancy and other industries in the construction field, so Dujiangyan still has great practical enlightenment and educational significance.
Dujiangyan is a great project. That's great. Because of its greatness, too many people have paid attention to it since ancient times, which is why so many stone statues of historical celebrities have been built on the weir road of the rockfill park.
Because of its greatness, many landlords and politicians in Shu throughout the ages regard the maintenance of this project as a very important thing, and dredging, maintenance and many other things have been placed in a very important position. Farmers and tax collectors involved in this project also think it is a great and outstanding event, so they try their best to ensure its long-term operation.
Seven. Maybe it's because I attend various trainings from time to time. This kind of training is not obvious in many kinds of training.
As the teacher laughed at himself, there is still a gap between Sichuan people's Putonghua and teachers in Beijing and other places. However, through this week, we can still learn a lot about work and personal growth. It is extremely valuable to listen to different teachers explain this knowledge from different angles and inspire our thinking.
Compared with the hotel's standardized service, the meals in the school canteen are relatively simple and the service is not so standardized, but I suddenly have the feeling of going to school that year.
When the dining hall received the meal ticket, the aunt actually reached out to stop the students who didn't pay the meal ticket from paying in first. The action of the uncle who collected and wiped the table was still different from that of the little girls in other places, but it didn't cause any unhappiness at all.
In downtown areas, delicious food is everywhere. Steamed stone fish in Longtan Bay, drinking water in the courtyard at the entrance of Leiyushan Park and so on. There is a wonderful taste. A few drinks once in a while will make this delicious food more sublime.
65438+ 10 Dujiangyan in August is indeed a harvest season, and fish and fresh rivers all over the street are fattening.
Oranges have been ripe for a long time and are already very sweet. The occasional sour taste stimulates the taste buds.
The so-called wild kiwifruit in Dujiangyan Scenic Area is small, but sweet, but when I want to look for it again, I can't find it in many places. The tall grapefruit trees at the entrance of Yulei Mountain are covered with big grapefruit, but there is still a period of time before the harvest, and the taste is still sour.
Dujiangyan behind me is still green on cloudy days, but as soon as the train leaves Sichuan, the plateau is full of golden eyes with some red, purple or green colors at night. This is really a harvest season, not only in Dujiangyan, but also in this plateau and many places in this ancient country.
In the past, technology was underdeveloped and productivity was low. There are many restrictions on the construction of a project, and the people involved in the project respect nature very much. Therefore, before the project construction, they all made full research and layout. Now the level of science and technology is high, all kinds of large-scale mechanical equipment are available, and the speed of engineering construction is also accelerating. The radish is not washed with mud, and it is much rougher than before.