Yangtze River: Great drop of Poyang Lake water level leads to hot discussion! Should dams be built or not? It's been controversial for 21 years

Tech 2023-07-17 21:51:56 Source: Network

Poyang Lake, the largest freshwater lake in China, can be said to be the most important lake in the mainstream of the Yangtze River in China, and bears the development of many areas in the middle and lower reaches of the Yangtze River in China.However, over the years, because of the water problem of Poyang Lake, there has been a lot of heated discussion, that is, its changes will cause water surges and water drops

Poyang Lake, the largest freshwater lake in China, can be said to be the most important lake in the mainstream of the Yangtze River in China, and bears the development of many areas in the middle and lower reaches of the Yangtze River in China.

However, over the years, because of the water problem of Poyang Lake, there has been a lot of heated discussion, that is, its changes will cause water surges and water drops.

Many people feel that Poyang Lake does not have any guarantee. In 2022, Poyang Lake will almost have no "lake" appearance because of the drought of the Yangtze River.

In 2023, there was finally an increase in water sources, resulting in a climate of high temperatures and less rain. The water level of Poyang Lake continued to decline.

Many people are discussing whether it is necessary to build a dam. Let's discuss it now.

The water level of Poyang Lake drops sharply! What is the reason?

Indeed, Poyang Lake has changed a lot. According to historical records, when the water level of Poyang Lake is 20 meters, it can reach more than 4125 square kilometers. When the water level is 14 meters to 15 meters, the lake area is 3150 square kilometers. When the water level is about 12 meters, it only has about 500 square kilometers.

Therefore, it is true that the water level of Poyang Lake changes greatly.

Its water source mainly comes from the five major rivers of Ganjiang River, Fuhe River, Xinjiang River, Raohe River, Xiuhe River, Boyang River, Zhangtian River, Tongjin River and other regions, and finally flows into the Yangtze River area at the mouth of Poyang Lake.

If there are many water sources in the Yangtze River, there will also be what we call "river water entering the lake", so this depends on where the water is abundant.

The area where Poyang Lake is located is very rich in resources, of which the water grass is abundant, which is conducive to the reproduction of aquatic organisms. According to the data, Poyang Lake produces more than 100 kinds of fish, mainly carp, followed by black carp, grass carp, silver carp, shellfish and snails. The lakeside plain is rich in rice, jute, soybeans and wheat, which is the main agricultural area of Jiangxi Province.

So, it can be said that Jiangxi is a very important lake.

However, in 2023, we will see that the water in Poyang Lake will rise and fall rapidly in the rainy season in summer. According to the data released by Jiangxi in July, at the end of June, after the water level of Poyang Lake rose to 15.18 meters, it quickly fell back at a speed of 10 to 20 centimeters every day, and the water surface area and volume of the lake area also decreased significantly.

From 8:00 on the 7th to 8:00 on the 15th, the water surface area of Poyang Lake has shrunk from 2590 square kilometers to 1850 square kilometers, and the volume has dropped from 7.59 billion cubic meters to 4.23 billion cubic meters.

It can be said that Poyang Lake has lost nearly half of its weight. What exactly is the reason for that? The reason for this is actually very simple, because it belongs to one of the main tributaries of the middle and lower reaches of the Yangtze River, and is also an important lake in the Yangtze River basin with water flow, throughput, and seasonal characteristics. What does this mean?

That is, the size of Poyang Lake will change significantly with the seasons. If there is more rainfall, it will rise. If there is less water, it will fall. So, it is the case that when there is no rainfall, the water will always fall, and the rate of decline is very fast.

Under such circumstances, many people are discussing whether the Poyang Lake should build a dam or not. Everyone is talking about it. Some support it, and some do not. Let's discuss it here.

The water level of Poyang Lake drops sharply! Should a dam be built?

Indeed, no matter in 2022 or 2023, as long as the water level of Poyang Lake drops sharply, many people will think about the building of a "gate" in Poyang Lake. Why is it so difficult to build?

And in 2021, a news about "19 years of controversy! Why is it so difficult to build a" gate "in Poyang Lake" also appeared in the Jiangxi announcement. It has been 2023, which is equivalent to 21 years of controversy, but still no results. In fact, this is nothing more than a question of whether construction should be carried out, and there is a "controversial" state between supporting and opposing construction.

Just to say that, the Natural Environment Department of Jiangxi Province has issued the "Pre approval Announcement of Land Prequalification and Site Selection for the Construction Project of Poyang Lake Water Control Project" for a long time, and has also given an effect map.

And the lack of construction is also due to the loud opposition. Should we build a dam or not?

Opponents - Those who oppose construction mainly believe that it will have adverse effects on flood control in the Yangtze River region, lacking a holistic view.

At the same time, it will bring many problems to the ecosystem of Poyang Lake area, among which water regulation, migratory bird habitat and food chain, aquatic organism migration, and water environment quality have not been solved. Although there have been many related discussions, no consensus has been reached after all.

Supporters - Supporters are very clear, that is because of the water issue. When there is no rainfall, there will be large-scale drought in Poyang Lake. In 2022, there will be obvious drought in the Yangtze River basin. Poyang Lake will not even look like Poyang Lake at all, and China's largest freshwater lake will disappear. Moreover, without water, the whole area around Poyang Lake is also affected.

So, in fact, both opponents and supporters have their own reasons.

But as for whether Poyang Lake should build a dam or not, the most important question is how to combine the suggestions of the opponents with the explanations of the supporters, and find a balanced place. This is the difficulty.

So, in fact, this is really "difficult". Once the dam is built, it means that the Poyang Lake will change on the whole. For example, more than 120000 waterfowl enter Poyang Lake every year. Once a dam is built, they cannot survive.

But what about not building? What if there is no water when there are significant seasonal changes? It is indeed mutually influencing. It can only be said here that we will see if we can find a strategy that can solve the problems of both parties in the future, which is the key.

summary

To sum up, from the perspective of the formation of Poyang Lake itself, these changes are not surprising, but for those who rely on Poyang Lake to survive, they must have an impact.

Therefore, it can only be said that both support and not support are reasonable. However, it is difficult for both sides to form an intermediate place under the final dispute. Otherwise, the dam construction of Poyang Lake has been controversial for decades, and no agreement has been reached.

So, even if the renderings we see appear, they still haven't been constructed yet.

This also shows the difficulty of Poyang Lake Dam construction. Of course, we say "if" here. If the construction is completed, the project may also need to affect many areas around the Poyang Lake. Because if the Poyang Lake is impounded, many areas will be flooded again, so this may be considered more, and we will not explain it here.

It is certain that both construction and non construction are enormous projects. Otherwise, the project will not be suspended here.

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