三峡大坝介绍英文-课堂课件.ppt

1、Geography Case Study-Chang JiangCons and Pros of the Three Gorges Project1Introduction?Chinas massive Three Gorges hydroelectric project has generated plenty of controversy from the start.It was first proposed in 1919 by revolutionary leader Sun Yat-sen as a way of providing energy to fuel the natio

2、ns industrial development.The plan was revived in 1954 as a way to control the chronic overflow of the legendary Yangtze river after tens of thousands were killed in widespread flooding.After several false starts,work began in earnest in 1979.?Advocates say Chinas development depends on it.They say

3、it will provide a clean source of energy for future generations.But critics say it could be a monumental ecological disaster.?The dams sluice gates were closed on June 1,2003,allowing the reservoir behind it to begin filling.By June 10,2003,the water was 135 metres deep,and its expected to be 175 me

4、tres deep by 2009.2Facts?The 16-year project is due to be completed in 2009.?The rivers level is expected to rise to 175 metres.?By mid-June 2003 the dam was holding back 12 billion cubic metres of water.The dams storage capacity is nearly 40 billion cubic metres.?It will create a 658-sq.-km reservo

5、ir.?Its concrete wall is 192 metres high.?It has a total of 22 sluice gates.?It will have 26 700-megawatt turbine generators.They are expected to produce 18.2 million kilowatts by 2009.Eleven of the reactors were in place as of January 2005.?It has the worlds largest lock system,6?kilometres in leng

6、th.The lock lifts and lowers ships in five stages.?The dam is located in Yichang,in the central province of Hubei.?Its Chinas biggest engineering project since the Great Wall was built more than 2,000 years ago.?Total projected cost:180 billion yuan($26.5 billion).3Location of Sanxia4?A man fishes a

7、s water flows through water diversion holes of the Three Gorges Dam on the Yangtze River in central Chinas Hubei Province,June 11,2003.Some 10 water diversion holes were opened to release water.The water level of the Three Gorges Reservoir reached 135 metres(433 feet)on June 10.(AP Photo/Xinhua,Du H

8、uaju)5?Two men carry bricks to a barge at the temporary dock at Wushan,in the middle of the Three Gorges on the Yangtze River in central China,June 6,2003.Lower lying areas of the town have been demolished in preparation for the increase in the water level as the controversial Three Gorges Dam reser

9、voir begins to fill.(AP Photo/Greg Baker)6?A Chinese man sits in the rubble of the demolished old town of Wushan,as he looks out over the citys temporary dock on the Yangtze River in central China,June 6,2003.(AP Photo/Greg Baker7?Workers build a stone embankment as water from the Yangtze River rise

10、 up the shoreline at the newly built town of Fengjie,in central Chinas Chongqing municipality,June 9,2003.The old town of Fengjie was demolished because it was below the high water mark of the reservoir of the Three Gorges Dam.(AP Photo/Greg Baker)8?Three young boys watch as rising waters inundate a

11、 corn field at Qutang Village,near Fengjie,in central Chinas Chongqing municipality,June 9,2003.Water levels have been rising between two and four metres each day since China began filling the reservoir.Despite warnings from local officials that waters would rise in June,many farmers planted crops b

12、ecause they were unsure of where the high water mark was on their land,while others did not believe that waters could rise so high.(AP Photo/Greg Baker)9?Ships sail through the Xiling Gorge of the Three Gorges on the Yangtze River in central China,June 11,2003.The water level of the Three Gorges Res

13、ervoir reached 135 metres(433 feet)June 10,five days ahead of the schedule.(AP Photo/Xinhua,Cheng Min)10?The aerial photo,taken on June 3,2003,shows the Three Gorges Reservoir on the middle reaches of the Yangtze River at Yichang,Hubei province.The water level reached,as planned,114.29 metres high o

14、n the sluice gate.(AP Photo Xinhua,Cheng Min)11?Hydroelectric generating sets of the Three Gorges Project in central Chinas Hubei Province are shown in this April 9,2003 photo.Four of the hydroelectric generating sets,which are in the final phase of installation and test,will be put into operation l

15、ater this year.(AP Photo/Xinhua,Du Huaju)12?Water flows through water diversion holes at the bottom of the Three Gorges dam,June 1,2003.Chinas Three Gorges Project officially began to store water as the sluice gate of the dam started to be closed as scheduled.China began filling the reservoir behind

16、 its gargantuan Three Gorges Dam in a major step toward completion of the world-largest hydroelectric project.(AP Photo/Xinhua,Cheng Min)13?A man rushes to board a boat before it leaves,in Chongqing city,on the Yangtze River in central China,June 5,2003.Though more than 600 kilometres(372 miles)from

17、 the Three Gorges Dam,water levels at Chongqing will rise up to 15 metres when the dams reservoir is filled to its highest level on completion in 2009.(AP Photo/Greg Baker)14PROS15Flood controlThe reservoirs 22 km3(28.9 billion cubic yard)flood storage capacity will lessen the frequencyof big downst

18、ream floods from once every 10years to once every 100 years.It protects lifeand property.16NavigationThe installationof shiplocksare intendedtoincreaserivershippingfrom10 millionto 50milliontons annually,withtransportationcostscutby30to37percent.Cheapandconvenientriver transportwill be provided.Also

19、,shippingwillbecomesafer,sincethegorgeshave lower flowing speed of channel.17AgricultureThe reservoir stores up the water that can bediverted to irrigate farmland.It increases cropproduction and exports of surplus farm produce,e.g.citrus fruits.18Energy and Environment?The dam will generate 18,200 m

20、egawatts of Hydroelectric power,the equivalent of 18 nuclear powerplants.It will facilitateindustrialand economicdevelopment.?China now relies on coal for?of its electricity.Its airis among the foulest in the world and contributes toglobalwarmi ng.Hydr o-elec tricpower is arenewableenergy source tha

21、t does not generatewaste.It improves air pollution.19Water SupplyDams can store rain water or water directlyfrom the river itself.Then,in case of a drought,the dam will still have a relatively constantsupply of water.20ResettlementIn 1996,floods displaced more than one millionpeople from their homes

22、.Besides,180 millionpeople are now without electricity in China.But 15 million people downstream will be betteroff due to the control of flood and the supply ofcheap electricity.Also,population distribution tonewly-opened area,e.g.higher ground of thedam,will be present.21Recreation and TourismThe p

23、roject provides recreational activities suchas boating fishing and swimming,if the lake isnot being used for drinking water.Also,cruiseships will be able to sail at all time.Thus,thedam will serve as a new tourist spot.22ReputationThe Three Gorges will be the most powerfuldam ever built.This is an i

24、mportant politicalstatus symbol for China.23CONS24Resettlement?About 1.3 million people will eventually be relocated from 1,400 villages in the area.By June 2003,720,000 people,from farmers to fishermen,had been displaced.In addition to the hardship of resettlement,critics say people are being moved

25、 to far less fertile land.25Pollution?The resettled people have left dozens of deserted towns in their wake.The buildings include hospitals and abandoned industrial sites.Environmentalists say refuse from those sites will seep out and contaminate the water.26Ecology/Archeology?Climate experts say th

26、e humidity and temperature will increase around the dam,causing unknown impact to the ecosystem.The Yangtze basin supports fish,wild fowl and plants,some of which are endangered.The area slated to be submerged is famous for its breathtaking scenery and is home to archeological sites including burial

27、 grounds and ancient temples.27Efficiency?Critics say a series of smaller dams would have fulfilled the countrys energy needs with less impact on the environment.28Corruption?The project has been plagued by charges of nepotism and inefficiency.After a number of high-profile accidents,the government

28、ordered much of the infrastructure replaced in 1999.29?Concerns have surfaced about the dam itself.There are some facts to prove.Firstly,allegations of corruption among officials involved with the project have raised fears of shoddy construction.The Chinese media recently reported several incidents

29、in which corruption and poor construction have led to disasters at major building projects.Notable among the reports was the collapse of a steel bridge in the city of Chongqing in January 1999 that killed 40 people.30?Such incidents also have prompted rare open criticism from the Chinese leadership

30、regarding the Three Gorges Dam.In early 1999 Chinese Premier Zhu Rongji inspected the dam site.He warned those involved in the project that he responsibility on your shoulders is heavier than a mountain.Any carelessness or negligence will bring disaster to our future generations and cause irretrieva

31、ble losses.Zhu also suggested China might invite top international engineers to inspect the dam and monitor its construction.Chinese leaders have long dreamed of taming the Yangzi for power generation and flood control.The rivers infamous floods have brought destruction and death for centuries-1 mil

32、lion deaths in the 20th century alone31?Dai calls Three Gorges he most environmentally and socially destructive project in the world.She also calls for a halt to construction and supports the idea of a series of smaller,less disruptive construction projects on tributaries of the Yangzi.?Moreover,of

33、further concern are claims the dam might become an environmental disaster.There have been little to no attempts made toward removing accumulations of toxic materials and other potential pollutants from industrial sites that will be inundated.Experts say such materials could leach into the reservoir,

34、creating a health hazard.Besides,the relative lack of waste treatment plants in China also could mean run-off from communities around the dam would most likely go untreated directly into the reservoir and into the Yangzi.32?By severing the mighty river and slowing the flow of its water,the dam will

35、cause pollution from industrial and residential sources to concentrate in the river,rather than be flushed out at sea,writes Chinese journalist Jin Hui in The River Dragon Has Come!a recently published collection of criticisms against the dam.The result will be a poisoned river.Electrical power deri

36、ved from the dams turbines will provide up to one-ninth of Chinas output,the government estimates33?Not only these,there are also claims that the dam will actually contribute to the silt accumulation in the Yangzi,rather than allow larger ships to travel the river.?And others dispute whether the ele

37、ctricity generated by the dam will be efficiently used.?In terms of an American scale,this dam is somewhat akin to the electrical load between Philadelphia and Washington D.C.being served from a single power plant.?Byrne is skeptical whether the huge amount of electricity expected to be generated by

38、 the Three Gorges project-meant to produce power for Chongqing and places as far away as Shanghai-can be efficiently and economically absorbed by Chinas electrical system.34?The social element of Three Gorges has generated more questions than answers.The dam will drown more than 100 towns once the w

39、ater starts to rise in 2003.Government estimates say 1.2 million people will be resettled and that new land is being provided for 300,000 farmers.Some observers say the government may be underestimating by as many as 700,000 the number of people who actually will be relocated.The Three Gorges Dam pr

40、oject will require the resettlement of 1.2 million people,according to the government,although observers say that estimate may be short by as many as 700,000 people35?The issue of the farmland,much of which has been tilled by the same Chinese families for centuries and will be lost under the reservo

41、irs waters,is particularly important,Byrne says.?One of the tragedies of this project,if just from a regional standpoint,is that the land that is going to be flooded is some of the most fertile in China,says Byrne.The land to where the population is to be relocated is much less fertile.?Historians a

42、lso have questioned the dams impact on attempts to preserve some aspects of Chinas long and illustrious history.Archaeologists and historians have estimated nearly 1,300 important sites will disappear under the reservoirs waters.?Most irreplaceable,according to some experts,are sites that are remnan

43、ts of the homeland of the Ba,an ancient people who settled in the region about 4,000 years ago.A former curator at Beijings National Museum of Chinese History describes the area as he last and best place to study Ba culture.36?For its part,the government is well aware of the problems and challenges

44、posed by the Three Gorges project.Nevertheless Guo Shuyan,deputy director of the Three Gorges Project Commission under the State Council,has described the project as environmentally sound,on the whole.The Yangzi is the longest river in Asia and the third longest in the world,stretching nearly 4,000

45、miles across China.The worlds longest river is the Nile;the second longest is the Amazon37?Chinese officials note the dam may end up providing as much as one-ninth of the nations electrical production.Considering that China burns 50 million tons of coal each year for energy,their point is that the e

46、nvironmental benefits outweigh the environmental damage.?It appears the Three Gorges project is too far along to be halted.More than 20,000 workers are working around the clock on the dam itself.The reservoir is expected to be at its full depth by 2009.38Maps394041Videos4243GROUP MEMBERS:?Cheong Yau Kit(Kit)?Kan Cham Chung(Kenneth)?Luk Kwai Lung(Ryan)?Lau Ka Ho(Max)44THE ENDThank you for your attention45