Many ancient projects are the crystallization of ancestors' wisdom, including Dujiangyan, and we should learn its scientific planning spirit while worshipping.
In fact, China's ancient buildings and water conservancy are good. I think they were born at the beginning of construction, except to meet people's needs. Another point is that the biggest feature of these projects is that they are born with the trend and built with nature. 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 can be well 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 designers and architects.
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 and reason, my mind welled up and knocked out such a sentence on the screen: Dujiangyan is like my hometown.
Of course, I'm not from Dujiangyan or Sichuan, but I have such a feeling for this small town that I can't even say it.
After thinking for a long time, I suddenly thought of Su Dongpo's words: This peace of mind is my hometown. This was written by Song Jirounu, Dongpo's good friend, when Wang Dingguo was demoted to Lingnan Pennsylvania for Wutai Poetry. The question to be answered is whether Lingnan is good or not.
Dujiangyan, an ancient town, is only an hour's drive from the center of Chengdu, but it is the source of the rise of Chengdu and even Sichuan, and enjoys the reputation of the source of abundance. It is because the ancient water conservancy project named Dujiangyan created the reputation of Sichuan as a land of abundance, so there are also individuals named guanxian.
In Dujiangyan in February and October, there is too much rain, which seems to be never enough.
When we arrived, it was cloudy after the rain, the ground was wet, the clouds were heavy and the sky was very low.
Fortunately, these rains always rise and fall unconsciously and stop unconsciously. Most of the time, they are not big, they will not go too far without an umbrella, and they will not get wet.
The ground and trees are covered with moss, either gray-green or green. Some of the mosses on the trees have grown some seedlings, while others have 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.
In the newly established Li Bing College of Continuing Education under it this year, among our classmates, there is actually one Li Bing, and the other one has the same pronunciation, 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 been changed to undertake various trainings, and there are not many students here.
Many mottled dormitory buildings have patches of gray in the crimson background on the walls, but they are not worn out, but they add a heavy feeling. Climbing plants covered the wall, showing the tenacity of life.
Dense buttonwood trees are all over the roadside, vigorous branches are crooked, and broad leaves are spread out, covering the sky above. On sunny days, you can only see some mottled and fine sunshine, and on rainy days, you can only see the raindrops that were tossed and turned from the leaves last time.
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, with my picky habit, I really don't like this practice. I always feel that it is excellent to use these three words to call this project. If you add the word water conservancy project, this ancient and heavy charm will be reduced a lot.
Like Qinghai Lake here, I still like the name without the word "Lake", but I have to change it to my current name because of the local province. For example, some famous time-honored brands are now decorated with limited companies and the like, which is very unsightly.
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 2000 years and is still playing a role today. 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, I knew its name long ago and read the text about its principle introduction, but I still didn't have a deep understanding. After listening to this introduction, I was even more confused.
So I had to find some information to continue my research and finally figured it out. 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 flows inward under the action of centrifugal force, which is a concave bank;
On the other side, due to insufficient water flow, sediment deposits and gradually protrudes, which is the convex bank. Because of this, this straight river becomes more and more curved.
In this way, the water flow is also affected, and the water level on the concave bank becomes higher and the water level on the convex bank becomes lower, just like when riding a bicycle to turn, both cars and people have to lean to the inside of the curve. The faster the speed, the more severe the tilt.
At the bend, the water on the surface of the water flows downstream, and at the same time, it rolls in the direction of both banks, from convex bank to concave bank, and then from concave bank to underwater convex bank, forming an annular water flow.
In this way, the water flow on the concave bank becomes light and clear, while the water flow on the convex bank is heavy and muddy, and the sediment keeps accumulating on the convex bank.
In Dujiangyan project, the Neijiang River irrigated by upstream fishmouth is just at the concave bank, which is easy to attract clean water. Moreover, Neijiang is deep and narrow, and the outer river is wide and shallow, which ensures that when there is little water, Neijiang can absorb enough water. When there is more water, too much water will come down from the wider outer river, and the amount of water extracted from Neijiang will not be too much. This is also the principle of four points and six droughts.
Although there is little sediment, there is still sediment in the water drawn from Neijiang, and sometimes there will be too much water, so there are flying sand weirs and treasure bottles.
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 the flying sand weir, the treasure bottle mouth is still at the end of the concave bank, which is convenient for discharging sand again, and the treasure bottle mouth is narrower than Neijiang. Coupled with the collision of rocks, sediment is either discharged from the flying sand weir or accumulated in front of the weir and dug away every year when dredging. In order to determine the dredging depth, stone horses and iron blocks were specially buried at the bottom, which means dredging and excavation.
I seem to be a picky person, but I'm not picky for the sake of being picky. Some important things still need to be clarified.
For example, in Dujiangyan, according to the ratio of "four to six" and "one to nine", some people say that the water inflow is 60% in dry season and 40% in wet season, so it can be calculated that the amount of sand entering the bottle mouth is 5% and the water discharged is 95%.
However, without considering the ever-changing amount of water and sediment, how can there be such accurate data? The so-called 46 is only the difference between 40% and 60%, and it is only a rough approximation, not 40% and 60% of the number.
A person who is good at thinking and distinguishing right from wrong needs to learn the spirit and essence of the former sages, and is by no means rigid and rigid. If so, then no matter how well he learns to add, subtract, multiply and divide, he is still doing the opposite, because the foremost foundation is wrong.
Dujiangyan is indeed a great water conservancy project, just like Zheng Guoqu and Lingqu, but Li Bing is greater than Guo Zheng and others.
Because ancient projects such as Zheng Guoqu and Lingqu have become history, Dujiangyan still plays a huge role.
The greatness of Dujiangyan lies in that Li Bing not only presided over the construction of a great water conservancy project that benefited the people at that time, like Zheng Guo and others, but also raised the management and maintenance of this project to a very high position, and formed a system and tradition, which was passed down from generation to generation, making it play a lasting role and continuously benefit the downstream people.
Today, two thousand years later, there are still ancient problems of neglecting management in water conservancy work, and these problems also exist in other industries in the construction field, so Dujiangyan still has great practical enlightenment and educational significance.
Dujiangyan is a great project. Greatness is a good thing. Because of its greatness, too many people have paid attention to it throughout the ages, which is why so many stone statues of historical celebrities were built on the weir road of the rockfill park.
Because of its greatness, many landlords in Sichuan have regarded the maintenance of this project as a very important thing throughout the ages, and dredging, maintenance and many other things have been placed in a very important position. Farmers and tax collectors who participated in it also thought it was a great and outstanding event, so they tried their best to ensure its long-term operation.
Seven, perhaps because from time to time to participate in various training, 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 of knowledge related to work and personal growth in an all-round way. It is still very valuable to listen to different teachers explain this knowledge from different angles and inspire our thinking.
Compared with the hotel's standardized service, the food in the school canteen is relatively simple and the service is not so standardized, but suddenly I feel the feeling of going to school that year.
When the aunt in the canteen received the meal ticket, she actually reached out to prevent the students who didn't pay the meal ticket from paying the ticket 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.
The city is full of delicious food, such as steamed stone fish in Longtan Bay, courtyard drinks at the entrance of Yulei Mountain Park and so on. , more exciting and better. Occasionally, a few drinks will make this delicious taste more sublimated.
8. Dujiangyan in 10 is really a harvest season, and the fish and seafood on the street are fattening.
Oranges have been ripe for a long time and are already very sweet. Occasionally, a little sour taste will stimulate the taste buds.
The so-called wild kiwifruit in Dujiangyan Scenic Area is so small but so sweet, but when I want to look for it again, many places have disappeared. The tall grapefruit trees at the entrance of Leiyushan are covered with big grapefruit, but now there is still a little time to harvest, and it tastes a little sour.
Dujiangyan behind him is still green on cloudy days, but as soon as the train leaves Sichuan and comes out at night, the plateau is full of golden eyes, mixed with some red, purple or green colors. 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, science and technology were underdeveloped and productivity was low, so there were many constraints in building a project. People engaged in this project are in awe of nature, so they have done sufficient research and layout before the project construction. Now the level of science and technology is high, all kinds of large-scale mechanical equipment are available, and the construction speed is also accelerating. The radish is not washed quickly, and it is much rougher than before.