Construction of the three canyon dams began officially on 14 december 1994 and was completed by 20 may 2006. After 12 years of effort, the three canyon dams are showing up in front of the world with the world's largest hydroelectric project. This construction is not only a demonstration of china’s capital strength, but also of its unparalleled wisdom。
But what many do not know is that dujiang is an absolute miracle of the world's waterworks compared to the three canyon dams that have been built with the help of modern technology. Despite the times of war that began more than 2,000 years ago, today, the millennial miracle of the duang river continues to benefit the people of the country。
The main reason why it is called a world miracle is that during the same period of time that dujiang was built, many great projects have taken place in all the countries of the world, but they still exist only in dujiang for more than 2,000 years。
The presence of dujiang
When it comes to the tokujiang, many people think of the three-country period at first, and zhuge liang looks at tujiang. There were even those who mistakenly thought that the construction of the tujiang had been carried out solely because of the bitterness of zhu liang, and that the former men had merely built a prototype. But in fact, the presence of dujiang is truly to be thanked for the fact that a thousand years ago, the government of qin, which was in charge of the management of the county, took charge of li bing. The main reasons for the construction of such a national water project are also due to the effects of the times and the environment。
Age background
As all those who know history know, during the time of war the qin state was in fact a relatively weak one and, in the face of other countries, was at first and always passively beaten. It was not until the advent of commercial changes that gradually changed the country's fragile situation and gradually gave the kings the ambition and strength to compete for the world。
However, despite the fact that qin's geographical location is far from the centre of the war, it is possible to move eastwards from one side to the west and to attack the six countries with whales. After all, in those years, when the average productivity of the population was at the bottom, the strength of the qin over the rest of the world lay in the country's next heart, the rule of law being relatively sound and the direction of development was clear。
For this reason, the qin state has had to give priority to areas that can bring substantial logistics to the country when it encroaches on its territory. It is also natural that the territory of the country, formerly under the control of qin, has been the primary target of attacks. Especially when qin sang-sama mistook the title of the "the abyss" and said it, the king of qin will not spare the region。
At that point in time, it was certainly not the kingdom of heaven, and the life of the people in the region could be described in terms of misery because of the ravages of the river. Especially after the difference between the water level of the chengdu plain and that of the yangtze river was 273 metres, it was a complete end of life。
In such circumstances, li bing, the qin government, must begin to improve the impact of the floods on the lives of the people and ensure that the bainang region provides adequate logistical support for the qin war effort. Only then can the qin truly fight the six nations. The construction of the dujiang gang began logically。
Environmental coercion
In addition to providing logistical support to the country, the environment in the bashingantahe region had forced people to make changes. Otherwise, no one will be spared at the onset of the floods. In the face of natural disasters, there is no distinction between the faithful and the ordinary people. How can we avoid the so-called officials when the waters of the river fall
In the dilemma, the depiction of “the difficult and difficult to achieve” is more a reflection of the hard of the dilemma. For those outsiders of that age, it was absolutely difficult to get into the barracks region. But for the locals, the hardships of the roads also limit their communication with the outside world. Once a natural disaster has broken out, the likelihood of people fleeing is far too small。
Moreover, in the aftermath of the floods, the current does not accumulate in a particular region, allowing the surviving people to survive with it. After the ravages, the yangtze river continued to swim down to the basil, leaving it to the plains of the chengdu inhabitants, often a drought that could not be seen at the end. In the book of shigee rivers, semama praised the great achievements of li bing's creation of tujiang, while the devastation that preceded the construction was reminiscent。
More importantly, when floods and droughts erupt, there are indeed a variety of epidemics. As long as those who have learned about the ming dynasty know, during the years of ming dynasty there were droughts throughout the country, often followed by epidemics. “the north side of china, 10 cities, 9 empty,” in eight words, shows how terrible the impact of the disease on the ancients is。
Li bing understood that without the timely construction of a well-functioning water project, the potential of the barracks region would be wasted. And it may be difficult for us to show up in the eyes of the world today in the praise of the state of heaven. Thus, dujiang is absolutely the key project that affects the entire bakian region。
Doojiang's work
After preparing for this, li bing immediately investigated the damage to the river. Following a field survey, li bing found that the serious damage to the chengdu plain caused by the yangtze river was influenced by two other key factors, in addition to the location and water quality factors. The first is that the jade mountain, in the eastern shore of the jijiang river, which was then an area of the irrigation district, has impeded the flow of water and has been forced to move towards the chengdu plain; the second is that a large amount of sand will be carried during the flood。
Those who know about the yellow river's water problems know that each year the river carries a large amount of mud downstream, and when these mud piles up, the river bed and the water level naturally rise. In such circumstances, it is only natural that the river spills across the banks, as is the case with the river. In such circumstances, it is necessary to address these two difficulties。
After careful reflection, li bing finally decided that one of the first things to do in order to deal with the plague from its roots is to break the jade mountain, which must be allowed to accumulate naturally when the flow of water is blocked. But in those years, there was no gunpowder that could have helped blow up the mountain, and it was absolutely far more difficult to build a mountain than ever before。
However, it was not hard to reach li, and he soon thought of using the hot and cold principle of burning the rock with a fire, immediately bringing it down. The rock is easily broken with a strong temperature differential. It was in this way that li bing took eight years to lead the local population and finally carved a 20-metre-wide, 40-metre-high and 80-metre-long entrance in the jade mountain, which is the bottle that we later knew very well。
Even so, because of the higher terrain of the river, the flow of water continues to be difficult to access and induce along the original route. In these circumstances, li bing decided to build a water-sapling not far from jade mount. They add large quantities of stones to the bamboo cages and accumulate an artificial small island, also referred to as the world's first artificial water-sharing island。
With the help of this watershed, li bing succeeded in dividing the burgeoning river into two parts: the inese and the foreign river, which has been very effective in reducing its power and dispersing it on both sides. What is even more difficult is the fact that the flow of water from the uchi river flows to the plain through the mouth of the bottle, while the external river is used to drain the flood and relieve the pressure of the river。
Not only that, but because of the different terrain, the currents are more likely to flow to the river. Under such geological conditions, when the dry season of summer and winter comes, even if no one intervenes, the flow will flow to the chengdu plain, fully guaranteeing irrigation of the good fields on the chengdu plain。
When the flood season comes, the water flow is affected by engineering and will flow to the outer river areas. As the ratio is between four and six, the greatness of the dujiang project is often praised by “four-six-point water” in future generations。
Of course, it is clearly not enough to be able to make a name for the world's water projects. Work like dujiang's did the "two-eight-point sand" in the mouth of the fish that divides the water。
As the saps are built in the bend area of the river, and as the internal river is in the cavity and the external river is in the cavity, the surface water is biased towards the inner river, while the bottom water moves along the cavity. Under these circumstances, bottom currents will also carry a larger number of mudslides out of the river, further reducing the threat to the chengdu plain。
In this sense, many moderners cannot even believe that this is something that ancients can think about, which is, after all, easy to say, but really difficult to do. Moreover, in response to the issue of sand, li bing even wanted to create a sand-flying sand in the inner river, which, when the amount of water exceeded a certain threshold, would again be able to treat the current and the sand, further reducing the threat to chengdu。
Years of maintenance
In terms of construction thinking and the way in which it is built, dujiang is called a water engineering miracle. But many do not understand why the current works can last 2,000 years. Even today, the government will not change the dujiang prototype, simply undertaking repair and maintenance work。
As a matter of fact, dujiang has been able to pass on to this day, focusing on the maintenance of the tujiang river over the years. Since the beginning of the qin dynasty, the chengdu region has truly become the rear end of the qin state。
At the time of the hanling emperor, two additional posts were created for the management of the area, namely, the “altuary of water” and the “also long”. Then zhugyang was well known, both because of the influence of the novels of the three nations, and because zhugyang was specializing in the creation of an official in the area, and even because of the allocation of 1,200 people for the management of the river。
How then can the conservation of tujiang take place at the onset of war? The answer is equally simple. First of all, tujiang is itself a miracle created by local conditions, using the terrain, and will not be destroyed as easily as any other project。
Second, the warlords or generals who are occupying the territory of tujiang understand that the existence of tujiang deserves everyone's respect and that the destruction of the region will be repudiated by all nations. Under such circumstances, the existence of dujiang is a matter of course。
Concluding remarks
Li baek referred to the "spills and fish" in the "spills and fish" and described the state of life of the palestinian people before the completion of the dujiang river. Fortunately, the construction of the dujiang river has been completed and people have finally stopped worrying about the threat of the yangtze river。
For such a great project, each and every one of us deserves respect. More importantly, the wisdom of ancient working people is still worth learning from. It is admirable that, without the help of the relevant technology, they are still able to achieve the miracles that many cannot do today。
