Good news!With the water levels of Poyang Lake and the Three Gorges Dam in China, it is exciting to see the rare phenomenon of Yangtze River water backfilling in Poyang Lake for the first time.
This is undoubtedly an excellent sign for the future development of Poyang Lake.
So, what are the benefits of the Poyang Lake water backflow and the Three Gorges water level?What is the reason for this?Let's take a step-by-step approach, first of all, a brief introduction to the basic situation of Poyang Lake and the Three Gorges Dam.
Poyang Lake – The Three Gorges Reservoir Poyang Lake is most closely connected to the Three Gorges in that they are both located in the upper reaches of the Yangtze River in China.
The Three Gorges Reservoir is located in the Xiling Gorge section of the main stream of the Yangtze River and is an important part of China's Three Gorges Project. After the completion of the Three Gorges Dam, the interception of water sources was realized.
Thus, this forms an important "artificial lake". The Three Gorges Project is a comprehensive large-scale project in China, involving flood control, power generation, shipping, water resources utilization and other aspects.
For example, the total installed power generation capacity of the Three Gorges Project has reached 22.5 million kilowatts, with an annual power generation capacity of more than 100 billion kilowatt hours, improved the shipping conditions of the Yangtze River, increased the annual one-way navigation capacity from 10 million tons to 50 million tons, and reduced transportation costs by 35 to 37 percent.
Poyang Lake is one of the main tributaries of the middle and lower reaches of the Yangtze River, and is also a water-flowing, throughput and seasonally important lake in the Yangtze River basin.
However, the change in the water level of Poyang Lake has been the focus of heated discussions. The area of the lake can reach more than 4,000 square kilometers at high water levels, and less than 500 square kilometers at low water levels, and this situation has been particularly evident in the past two years. And behind all this is nothing more than the problem of water resources.
The phenomenon of the water level of Poyang Lake and the backflow of water from the Yangtze River has brought a positive signal for the future changes of Poyang Lake.
Although there is a view that the low water level of Poyang Lake is related to the Three Gorges, there may be a certain connection, but it is not an absolute causal relationship.
In order to maintain the water level of Poyang Lake, the most important thing is to ensure that its water system is abundant. The lake gathers the water sources of the five major rivers of Ganjiang, Fuhe, Xinjiang, Rao and Xiuhe, as well as the basin water of Boyang River, Zhangtian River and Tongjin River. If these areas are not recharged by rainfall, it will be difficult for Poyang Lake to maintain a high water level sustainably.
When it comes to the issue of water levels, we have to touch on a controversial topic, namely the Poyang Lake Water Conservancy Project. Indeed, the project may be able to solve the problem of water levels, allowing water to be released when there is abundant rain, and intercepting the flow of water when there is no rainfall, avoiding prolonged water shortages. However, the controversy over the construction of the Poyang Lake water conservancy project has focused on its potential impact on the ecological environment. This is one of the reasons for the controversy that has lasted for about 20 years.
It is difficult to determine whether agreement can be reached in the future. Reaching consensus on this issue required a proposal that was agreed upon by all parties involved. Otherwise, it will be difficult to move forward to the next step, whether it is built or not. Recent data shows that for the first time this year, the Yangtze River backflow occurred, with the outflow of Poyang Lake at -2 on October 4 and October 677 cubic meters per second and -531 cubic meters per second, which caused concern in the hydrological department.
Satellite remote sensing monitoring data shows that in Poyang Lake 10For 5 periods, the total area of the main body of the lake and the surrounding waters is 2098 square kilometers. Compared to the previous 9In 18 periods, the water area increased by 695 square kilometers, an increase of 495%。This is 102 periods of monitoring twice the area of the all-time low.
This change in the lake is indeed a positive trend, but what is the reason behind it?
According to the published information, this change is mainly due to the influence of autumn rains in western China, which led to the gradual rise of the water level of the Yangtze River, which formed a certain supporting effect on the water level of Poyang Lake, causing the river water to backflow. It should be noted that river backfilling is not a common phenomenon, and there is an "echelon" relationship between Poyang Lake and the Yangtze River, so the so-called "first time this year" also shows that this is not an unusual occurrence.
Judging from the water level of Poyang Lake, although it exceeds 13 meters, it is still slightly less than the same period in history, and it is not too high. It is worth emphasizing that before this, the water level of Poyang Lake had already exceeded 12 meters, mainly due to the increase in the amount of water in the lake's own water system.
Therefore, river backflow is only part of the overall impact, not a single cause. Although the autumn rains in western China had a certain impact on Poyang Lake, the water level of the lake was already high before that, and the backflow of river water only contributed to the troubles. This situation has also brought benefits to the Three Gorges Reservoir, which is also welcome news that the water level has exceeded 171 meters after the start of the 175-meter storage this year, and it is getting closer and closer to the storage target.
If the Three Gorges Reservoir reaches 175 meters ahead of schedule and recycles water to release water, it will bring better news to the middle and lower reaches of the Yangtze River. Therefore, the water situation of the Yangtze River this year is relatively satisfactory.
However, if there is no more water supply in the future, Poyang Lake will definitely decline again. Since autumn and winter are relatively scarce periods of water, the autumn rains in West China will not continue. This needs to be understood.
At the same time, there is a misconception that needs to be clarified. Many people say that the Three Gorges Reservoir has not released any more water after seeing that it has started to fill water, which is completely wrong. Even in the process of impounding water, the reservoir is still releasing water, because the Three Gorges needs to ensure power output, shipping and other issues, and it is impossible to completely stop the release of water. Therefore, it needs to be clear here, and everyone should not misunderstand.
What are the benefits of increased water volume?For both Poyang Lake and the Three Gorges Reservoir, the increase in water volume is beneficial.
For Poyang Lake, the increased amount of water is good for the living conditions of winter organisms. With the arrival of the migratory season for wintering migratory birds, it is reported that wintering migratory birds such as wild geese are moving in one after another. The drastic changes in the hydrological situation will have a great impact on the habitat of animals and plants in Poyang Lake. If there is water, the living conditions of the creatures may be improved to a certain extent, and this is the benefit.
For the Three Gorges Reservoir, after reaching the target of 175 meters of water storage, it will be more beneficial to the water source security in the subsequent dry season. Water is stored at the end of the flood every year, and gradually released and vacated before the flood in the dry season to the next year, so as to provide a strong guarantee for the shipping, water supply, ecology, power generation and other needs of the Yangtze River basin this winter and next spring. Therefore, if you reach your target ahead of schedule, you don't need to worry about water sources.
Overall, the rain momentum in the Yangtze River this year looks good in the short term. It would be even more advantageous if it could maintain stable development. The key also depends on whether the climate will change later. Hopefully, the above rephrase will meet your requirements.