Dams destroy ecology? The United States has demolished more than 1,000 dams, so why does China keep

theIt's not that China doesn't know that dams can damage the local ecological environment. Rather, our country must build. The flood has always been a painful memory for our country.

Although the Yellow River and the Yangtze River are our mother rivers. But mothers also have moments of anger and anger. Not to mention before the founding of the People's Republic of China, even after 49 years, the Yellow River and the Yangtze River also flooded many times.

Even the northernmost Songhua River and Heilongjiang River have been flooded many times. However, with the construction of dams and other water conservancy facilities, the impact of floods on our country has been much smaller. For the floods in the Yangtze River in 2020 and 1998, the scale was basically the same, but this year's damage was much smaller.

First of all, let's talk about the damage to the environment, although dams will change the local natural environment to a certain extentIt can be said that the construction of each dam will affect the local biosphere in a short period of time, but with the precipitation of time, the forces of nature can completely rebalance the local ecology. So in fact, it doesn't have much impact on the ecological environment. <>

In fact, there is another problem, and that is hydropower. In fact, hydropower is a very environmentally friendly energy source. After all, hydroelectric power is the use of the power of nature's water currents.

It does not cause very serious air pollution like the generation of electricity in thermal power plants. And the amount of hydroelectric power is very large. And it's definitely cheaper than thermal power.

So overall, building a lot of dams is a very good option. But one thing to say here is that floods cannot be used to generate electricity, because the direction and velocity of floodwaters do not meet the requirements for power generation. Another problem is that floodwaters contain a lot of debris.

So there is no power generation at all, so every time there is a flood, the dam tends to release flood water or control the flow.

Finally, there is another problem, that is, there are many people in our country, so the requirements for grain production are very high. The Yangtze and Yellow rivers have a large amount of arable land. So dams had to be built to fight flooding.

And we all know that the Yellow River has a very high sand content. Therefore, the use of dams to control sand is also a very good option. <>

In fact, an important reason why the United States rarely builds dams is that there are really not many floods in the United States. And the measures taken by the United States are not simply to eliminate floods, but to eliminate small reservoirs. Larger reservoirs and dams are retained.

Because giant dams can better resist flooding. Moreover, the precipitation in the United States is actually less than the average precipitation in our country. So in fact, one of the main natural disasters in the United States is **, and the other is hurricanes.

That's why the United States is cutting the number of dams, while our country is still building dams. And in other words, water conservancy facilities in the United States were actually built very early, while water conservancy facilities in China started relatively late. It can be seen that the United States is dismantling dams that have little effect, while China is making up for them.

Dams do not damage the ecology, only the irrational use of dams will destroy the ecology. Most of the dams in the United States are unreasonable, so they are dismantled, while China's continuous construction of dams is a rational use of resources for the benefit of mankind.

Dams can lead to sediment accumulation, less fish, eutrophication of water bodies, and safety hazards if they are not built and maintained scientifically. Because dams can generate electricity and irrigate, they are still being built in our country.

The United States is demolishing dams to reduce agriculture, return farmland to grazing on a large scale, and shift from grain production to animal husbandry, and the United States has a small population and abundant water resources in all seasons. If China wants to make everyone eat and drink like this, and compare others without looking at the objective situation, you are either stupid or bad!

The dam built in China is conducive to the development of China's economy, the dam will destroy the ecology, its merits outweigh the faults, the dams built in China are relatively young, and the ecological environment should be considered more comprehensively.

Because dams are retaining structures that intercept the flow of water from rivers to raise water levels or regulate flow, many places can be flooded without dams.

The U.S. is dismantling dangerous dams that are out of their useful life.

More than 100,000 dams have been built in our country, some of which are very small and some are very large, and 20 of the 100,000 dams are more than 200 meters. It may be thought that there are very few dams over 200 meters or more, but in fact there are very many, and there are only 77 pumps above 200 meters in the world.

1. China has been vigorously building dams

In recent years, China has been working hard to develop its economy, and building dams is also a very good way to drive the development of the local economyMany well-known dams have been built in our country. For example, the Beijing-Hangzhou Grand Canal, the Three Gorges Water Conservancy Project of the Yangtze River, and the South-to-North Water Diversion Project.

Our country has spent a lot of human, material and financial resources, and the country has spent a lot of money on the construction of damsThe main purpose of building our dams is to develop the economy.

In fact, there are many more benefits to building dams, which can prevent floods and droughts, and can also improve water transportation. One of the most important aspects of building a dam is hydroelectric power, which is a great way to conserve energy.

Hydropower can improve the environment and reduce the consumption of coal resourcesBut the construction of dams can also have an impact on the local ecology, especially fisheries.

The construction of dams destroys the local vegetation, the roots of which are pushed to the bottom by the river, and the roots of green vegetation at the bottom of the water cause trophication of the water bodiesIt can also affect the reproduction of fish, destroy the local ecosystem, and adversely affect the local environment.

Our country's economy has indeed developed vigorously in recent years, but the environment has also suffered great damageThe construction of dams is also a major aspect of environmental damage, but our country is now also beginning to pay attention to environmental restoration.

2. The United States has been dismantling dams

The United States is completely different from our country, and in recent years our country has been vigorously building damsThe United States, on the other hand, has been dismantling dams, having removed more than 1,000 dams in the past two years.

What is the purpose of dam demolition in the United States? Many people think that the United States is trying to protect the ecological environment, but in fact, everyone's opinion is completely wrong.

Chinese researchers have found that most of the dams that Americans have dismantled are dams that have been in disrepair for too longThere are already a lot of damage to the dams, and it is not worth the huge expense to repair them, so the United States wants to completely dismantle these dilapidated dams.

The Americans dismantle the dams as a last resort, not at all to protect the ecology, the United States is a country whose interests are paramount, and it is impossible for the United States to destroy economic growth in order to protect the environment.

On the one hand, it is because our country needs to use water to generate electricity, and on the other hand, it is because of the need to prevent floods.

Because China's water resources are also relatively abundant, the old closed words of building dams will also provide us with more power resources, so that we can live a better life and continuously transmit electricity to reserve the car.

Dams regulate the flow of water, prevent disasters and floods, and generate new energy sources. The United States is only demolishing some old dams in the past, and China is also building dams for better disaster prevention.

Our country began to rise in modern times, but in modern times, China has attracted a heavy history, which makes people feel regretful, but it is this regret that makes us the strength we have now, that is, to realize the great rejuvenation of the Chinese people and realize the Chinese dream. Especially since the beginning of the 21st century, China has made great strides in many industries and developments, especially in hydropower projects, and China ranks first in the world in the number of dams. Because of this, the reasons for China's continued construction or demolition in the future have been discussed.

The answer is based on actual decisions at home, and here's why. The dam was once considered a feat of modern engineering and a symbol of man's transformation of nature. Now they are being dismantled by the Americans.

Over the past 25 years, nearly 900 dams have been dismantled in the United States. They were originally built to power machines, store water, irrigate, or use hydroelectric power to generate electricity. Now, 50 to 60 dams are removed every year.

Environmentalists say they were amazed at how quickly nature was recovering as the dam was removed.

In order to reduce the damage caused by flooding to the middle and lower reaches of the Yangtze River, a huge project, the Three Gorges Project, has begun. Construction began in early 1994 and was not completed until May 2006. The most important thing is that the dam should be strong enough to withstand the impact of flooding.

If the dam suddenly collapses during the flood release, the consequences are incalculable. Therefore, in the construction of the Three Gorges Project on the Yangtze River, the amount of concrete and steel bars is also very huge. The amount of concrete used for the main building of the Three Gorges Project alone is as high as 27.94 million cubic meters, and the amount of steel bars is 10,000 tons.

Sufficient steel and concrete also guarantee the reinforced structure of the dam. As a result, China has the largest population in the world today, and because of this, China's internal energy resources have been in a relatively tight state, and China's continuous construction of hydropower dams can alleviate the relative depletion of China's internal energy resources. So, if you want to continue building, it's also very good to continue building dams when people need resources, or when resources are depleted.

China's population is more disturbed, so the demand for electricity is greater than that of the surplus, continue to build, so as to protect China's interests and promote the development of the country.

China is a country in particular need of water hubs. Only by building a large-scale pure water conservancy hub can we revitalize the water and eliminate the flood disaster. China is also a big agricultural country, and according to the principle of self-sufficiency in grain, agricultural irrigation and water supply is also an important function of reservoirs.

After the natural precipitation has been regulated and stored by the reservoir, it can be taken and used at any time, which is especially suitable for agricultural production.

I think it depends on the future development, if the future development is better, then these dams can also be demolished.

Once seen as a feat of modern engineering and a sign of man's transformation of nature, dams are being dismantled by Americans.

Over the past 25 years, nearly 900 dams in the U.S. have been demolished to power machines, store water, irrigate or use hydroelectric power. Now, 50 to 60 dams are removed every year. Environmentalists say they were surprised by the speed with which nature has recovered as the dam has been removed.

Laura Rose Day, who has been working on river conservation in Maine for 16 years, said: "We're beginning to acknowledge the values that we've discarded. It is believed that the dam was demolished only for the sake of fish.

But then they will say, 'Ah, the eagles are multiplied!' Ah, the water is clearer!

Ah, I love the rushing water! ’”

The removal of two downstream dams at Winslow and Augusta allowed the river to flow freely from Benton Falls to the sea. Mike Jocelyn, who works at the Essex Hydropower Station in Benton Falls and is responsible for maintaining the fish ladder, spotted a striped perch feeding on the grey sprat while fishing under the dam as the grey sprats increased. He said:

Now, my perspective has completely changed. Grey sprats are important for the environment. ”

Dams don't just harm fish. Dams block the flow of sediments and nutrients from rivers, which are important for the health of rivers and downstream lands. Water bodies that are held back by dams flow slowly and have high temperatures, making them unsuitable for the growth of organisms that prefer clear, fast-flowing, and low-temperature water.

The oxygen content in the water decreases, sediments accumulate and toxic substances increase. Aquatic plants and algae plants grow rapidly, and birds begin to forage elsewhere. <>

However, the purpose of dam removal in the United States is not as high-sounding as they say, and the real reason is mainly due to the safety concerns of many old dams. In addition, the United States seems to have been dismantling dams in small places, and some large dams have not been dismantled.

The American Society of Civil Engineers gave dams a safety rating of "D" in its assessment of infrastructure, noting that more than 2,000 "high-hazard" dams had structural defects. This is a very real threat.

In 1972, a dam collapsed in Buffalo Creek, West Virginia, killing 123 people.

That same year, the Canyon Lake dam in South Dakota collapsed, killing 238 people.

In 1977, a dam collapsed in Georgia, causing floodwaters to rush into a Bible college, killing 39 people.

Today, the U.S. has about 80,000 dams taller than 6 feet, and more than 2 million small dams. <>

The 108-foot-tall Elva Dam in Washington, which was removed in 2011, is the largest dam ever demolished.

The 210-foot-tall Grans Canyon dam on the Elva River was demolished to allow salmon in the Pacific Ocean to enter.

The demolition of the Embury Dam on the Rappahannock River in Virginia was carried out by engineers with 600 pounds of explosives.

The demolition of the Edwards Dam on the Kennebec River in Maine in 1999 is seen as a landmark event. The 917-foot-long, 24-foot-tall hydroelectric dam endangers fish.