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三峡大坝The Three Gorges Project.ppt

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三峡大坝The Three Gorges Project

The Three Gorges Project Brief introduction The Three Gorges Project is the largest hydropower project in the world, and its construction was started on December 14, 1994. The dam is located in Sandouping Terrace in the middle section of Xiling Gorge in Yichang City, 38 km away from Gezhouba Dam Water Control Project. Reasons But there has been concern about possible negative impacts on the environment by the project both at home and abroad. So many people are against this project. 1.Erosion and sedimentation(侵蚀和沉积) Two damages are uniquely identified with the dam. One is that sedimentation projections are not agreed upon, and the other is that the dam sits on a seismic地震的;因地震而引起的fault. Because the flow is slower above the dam, much of this sediment will now settle there instead of flowing downstream, and there will be less sediment downstream. 2.Earthquakes and landslides(地震和山体滑坡) Erosion in the reservoir, induced by rising water, causes frequent major landslides that have led to noticeable disturbance in the reservoir surface, including two incidents in May 2009 .Also, in the first four months of 2010, there were 97 significant landslides. 3.Waste management(废物管理) The dam catalyzed(催化)improved upstream wastewater treatment around Chongqing and its suburban areas. According to the Ministry of Environmental Protection, as of April 2007 more than 50 new plants could treat 1.84 million tonnes per day, 65% of the total need. About 32 landfills were added, which could handle 7,664.5 tonnes of solid waste every day. Over one billion tons of wastewater are released annually into the river, which was more likely to be swept away before the reservoir was created. This has left the water looking stagnant(停滞的;污浊的), polluted and murky(黑暗的;朦胧的;阴郁的)。 4.Forest cover(森林覆盖) The Three Gorges area currently has 10% forestation, down from 20% in the 1950s. The main reason is Chinas huge reforestation造林effort. This accelerated after severe flooding in 1998 convi

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