The Yangtze River and the Yellow River, as the two most important rivers in China, are not only important geographical symbols, but also witnesses of Chinese civilization. The Yangtze River, with its length of 6,300 kilometers and abundant water resources, is known as China's "Mother River". The Yellow River basin is named because the river water carries a large amount of sediment.
What would happen if one day, the runoff of these two rivers suddenly swapped? Let's take a look at the answer's answer.
If the runoff of the Yangtze River and the Yellow River were swapped for 1 day, would the impact on human life be great?
| Answer: No need to cross the river
If both the Yangtze River Water Conservancy Commission and the Yellow River Water Conservancy Commission know in advance that they are going to be swapped and can choose the time of the swap, then this will turn out to be a good thing.
At least in the case of the Yellow River, it's a good thing.
The first is the choice of the exchange time, avoiding the flood season of the Yangtze River, because the Yellow River basin cannot withstand the exchange of flood seasons.
Avoid the ice period of the Yellow River (December-March), also because the Yellow River basin cannot withstand it.
The amount of water in such a small amount of the Yellow River has been flooded, and the amount of water in the Yangtze River for one day is directly frozen for thousands of miles.
And considering that the flood season of the Yangtze River (May to mid-October) is relatively long,
So the time of the swap should be between the end of March and the end of April, or the end of October and the end of November, for a total of two months.
The annual runoff of the Yangtze River is about 970 billion cubic meters, of which about 70%-75% is in the flood season and about 240 billion cubic meters in the non-flood season.
As a result, the daily runoff during the non-flood season (6 and a half months, 195 days) is about 1.23 billion cubic meters.
Therefore, as long as the Yellow Committee knows which day it will be exchanged, it is enough to notify Longyang Gorge in advance, and Longyang Gorge (storage capacity of 24.7 billion cubic meters) will be emptied ahead of schedule.
Longyangxia Hydropower Station
As for other reservoirs downstream, such as Liujiaxia 5.7 billion cubic meters, Sanmenxia 16.2 billion yuan, and Xiaolangdi 12.6 billion yuan......
Other reservoirs can't even touch the edge of the Yangtze River.
Probably when the various water conservancy hubs get together, they have to talk to Longyang Gorge and say: You are great upstream, put it down a little, our generator really can't turn up.
On the Yangtze River, it is even better to say: advance notice, shipping and power generation will be suspended for one day, and all reservoirs and sluices and dams along the way will store water in advance. After the water of the Yellow River came, there was no water at all......
Mud cows into the river, you know.
There is not much problem with the sediment brought, and when the exchange is over, it will be finished by learning from the Yellow River to transfer water and sand once.
More troublesome are the lakes and aquatic flora and fauna of the Tongjiang River, including Poyang Lake and the lakes in the middle and lower reaches of the Yangtze River.
Poyang lake
Because there is no restriction on the sluice dam, the water body of the lake will decline rapidly within a day, and even if the middle and upper reaches of the reservoir are impounded in advance, on the day of the exchange, the water will be released downstream, I am afraid the situation is not optimistic.
The animals and plants that depend on these rivers and lakes for their survival, such as the finless porpoise, may be more than lucky.
When the time comes, those who opposed the construction of the Poyang Lake Water Conservancy Project will probably beat their chests. (including me)
But I thought about it again, for example, the Three Gorges and Gezhouba both store water in advance, and the Three Gorges reservoir has a capacity of 39.3 billion cubic meters, which is equivalent to the runoff of the Yangtze River in one month during the non-flood season.
If there is a plan to release water, it is not a big problem.
Well, if it doesn't matter, I will continue to oppose the construction of the Poyang Lake Water Conservancy Hub (because I am from the Yellow River Basin, and there are some things that really just stand and talk without backache).
Source: Zhihu Daily
Editor: Muzi
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