Three gorges dam

The Yangtze is the third longest river in the world, at almost 4, miles.

Three gorges dam

Higher-paying customers, such as Shanghaireceive priority. Construction was completed in Decemberone year ahead of schedule. However, electricity demand has increased more quickly than previously projected.

Even fully operational, on average, it supports only about 1. From toa total of million tonnes of goods passed through the ship locks. The absence of silt downstream has three effects: Some hydrologists expect downstream riverbanks to become more vulnerable to flooding.

The "arriving silt—so long as it does arrive—strengthens the bed on which Shanghai is built According to the Ministry of Environmental Protection, as of Aprilmore than 50 new plants could treat 1.

About 32 landfills were added, which could handle 7, This has left the water looking stagnant, polluted and murky. This is largely due to China's large reforestation effort. This accelerated after the Yangtze River floods convinced the government that it must restore tree cover, especially in the Yangtze's basin upstream of the Three Gorges Dam.

Please update this article to reflect recent events or newly available information. October Concerns about the potential wildlife impact of the dam predate the National People's Congress 's approval in It is home to 6, species of plants, which belong to families and genera.

Of these plant species, 57 percent are endangered. The region also provides habitats to hundreds of freshwater and terrestrial animal species.

Many other fish are hurt in the turbine blades of the hydroelectric plants as well. This is particularly detrimental to the ecosystem of the region because the Yangtze River basin is home to different fish species and accounts for twenty-seven percent of all endangered freshwater fish species in China.

In fact, Government Chinese scholars even claim that the Three Gorges Dam directly caused the extinction of the baiji. Though it was close to this level even at the start of construction, the dam further decreased its habitat and increased ship travel, which are among the factors causing what will be its ultimate demise.

In addition, populations of the Yangtze sturgeon are guaranteed to be "negatively affected" by the dam. Millions of people live downstream of the dam, with many large, important cities like WuhanNanjingand Shanghai situated adjacent to the river.

Three gorges dam

Plenty of farm land and China's most important industrial area are built beside the river. The dam is expected to minimize the effect of even a "super" flood. The flood affected more than 2. It also improves shipping conditions.

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The water also powers the Gezhouba Dam downstream. Shipping will become safer, since the gorges are notoriously dangerous to navigate. It is expected that shipping to Chongqing will increase fivefold. Each of them is made up of five stages, with transit time at around four hours.

Before the dam was constructed, the maximum freight capacity at the Three Gorges site was The gates are the vulnerable hinged type, which, if damaged, could temporarily render the entire flight unusable.

As there are separate sets of locks for upstream and downstream traffic, this system is more water efficient than bi-directional staircase locks. Ship lift[ edit ] The shiplift, a kind of elevator, can lift vessels of up to 3, tonnes, at a fraction of the time to transit the staircase locks.

In addition to the canal locks, there is a ship lifta kind of elevator for vessels.

Three Gorges Dam - Wikipedia

The ship lift takes 30 to 40 minutes to transit, as opposed to the three to four hours for stepping through the locks. The ship lift's design uses a helical gear system, to climb or descend a toothed rack.

As of Maythe ship lift was expected to be completed by July The moving mass including counterweights is 34, tonnes. The trials of elevator finished in Julythe first cargo ship was lifted in July 15, the lift time comprised 8 minutes.Construction of the massive Three Gorges Dam in China began in , with most construction completed in However, interest in the project extended back several decades, and American engineer J.L.

China's Three Gorges Dam: An Environmental Catastrophe? - Scientific American

Savage, who had played an important role in the building of Hoover Dam, worked on preliminary designs for a large dam on the Yangtze River (Chang Jiang) in the mids before the . The Three Gorges Dam consists of a main dam wall, and a section on the right with a set of five locks, which are devices used to raise boats and ships..


dam | Definition, Types, & Uses | In about 10 years, the complete cost of the dam will be recovered. Flood control[ change change source ] A model of the spillways of the Three Gorges Dam, used to remove floodwater from the reservoir.
Expertise. Insights. Illumination. See Article History Alternative Title: A straight-crested concrete gravity structurethe Three Gorges Dam is 2, metres 7, feet long with a maximum height of metres feet.
Three Gorges Dam | Facts, Construction, Benefits, & Problems | But last fall, denial suddenly gave way to reluctant acceptance that the naysayers were right.
Ancient dams Geological evolution[ edit ] Due to the lithological conditions of its different regions, the valleys of the Three Gorges are narrow in some areas and broad in others. Most narrow valleys occur in regions where there is limestonewhich is relatively hard and resists erosion.

Michael Brannigan and the . The Three Gorges Dam is a hydroelectric gravity dam that spans the Yangtze River by the town of Sandouping, in Yiling District, Yichang, Hubei province, Three Gorges Dam is the world's largest power station in terms of installed capacity (22, MW).In , the dam generated terawatt-hours (TWh) and had the world record, but was surpassed by the Itaipú Dam, which set the .

The Three Gorges Dam is the world’s largest power producing facility, and the world’s largest hydroelectric dam. There were many reasons for building the dam due to its history and other causes. Three Gorges Dam [Thomas V.

Harris] on *FREE* shipping on qualifying offers. CHINA'S WESTERN FRONTIER IS A POWDER KEG. ITS BUDDHIST AND MUSLIM MINORITIES ARE ABOUT TO LIGHT THE initiativeblog.coml Brannigan and the People's Republic of China are concluding a triumphant week.3/5(2).

Three Gorges - Wikipedia