There are a lot of dead fish floating in the Beijiang River of Rongjiang River. What is the reason?

There are a large number of dead fish floating in the Beijiang River of Rongjiang River, mainly because the salinity of the river suddenly drops, and the grouper dies in a large area due to the salinity change.

According to media reports, a large number of dead fish are floating in some sections of the Beijiang River in Rongjiang, Jieyang City, emitting an unpleasant smell. Later, after investigation by Jieyang Ecological Environment Bureau, the specific reasons are as follows:

Is the river salty? Generally speaking, we generally think that sea water is salty, so how can river water contain salt?

It turns out that rivers are fresh water, the salinity is usually less than 0.5 per thousand, and seawater is generally 35 per thousand. If it is near the land, there will be a big river flowing in, which will definitely reduce the salinity of the sea where the river flows into the sea. Theoretically, the salinity enrichment process of lakes is similar to that of oceans. Surface runoff will continuously introduce dissolved salt into lakes, but because some lakes are connected with rivers, dissolved salt may flow out. In addition, due to the influence of evaporation, precipitation, icing, melting and land runoff, the distribution of seawater salinity is actually uneven.

Why does the salinity of the river fluctuate? In the dry season, such as less rainfall, more evaporation and less upstream water, salt water intrusion often occurs, which affects residents' domestic water and industrial water. According to the water quality standard of drinking water source, the chloride content must be less than 250 mg/L, and if it exceeds this value, the water quality standard cannot be reached.

Let's talk about the problem of fresh water resources last year:

Last year, there was almost no rain in most parts of China for many years, which led to water shortage in many areas, and Jieyang airport area was also a very serious water shortage area. At that time, one day, the water was cut off, which can be said to be a precedent of water shortage in Jieyang city. Subsequently, the local government began to find ways to solve the water supply problem, and later heard that it was going to introduce the Hangzhou River in Chaozhou to solve the urgent need. To this, many people have questions:

China is short of fresh water resources. Why not intercept the Yangtze River and Yellow River for your own use, but let them flow into the sea?

Not to mention the official words. If you can intercept the Yangtze River and Yellow River for your own use, do you still need to let them flow into the sea? Isn't it common sense if we can boldly use our imagination to transfer the water from the Yangtze River and the Yellow River? It can only be said that interception is not an easy task, and it is unrealistic to have a very large artificial lake to accommodate them at present.

Conclusion: Generally speaking, if there had been no drought in Jieyang last year, it would not have caused such a great change in the salinity of the river, which led to the inadaptability of some fish and a large number of deaths. But fortunately, it has rained recently. I hope it can last for one year, because the current water consumption situation of residents is not very optimistic.