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ID:51154377
大小:4.93 MB
页数:46页
时间:2020-03-19
《三峡大坝介绍[英文].ppt》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、GeographyCaseStudy-ChangJiangConsandProsoftheThreeGorgesProjectIntroductionChina'smassiveThreeGorgeshydroelectricprojecthasgeneratedplentyofcontroversyfromthestart.Itwasfirstproposedin1919byrevolutionaryleaderSunYat-senasawayofprovidingenergytofuelthenation'sindustria
2、ldevelopment.Theplanwasrevivedin1954asawaytocontrolthechronicoverflowofthelegendaryYangtzeriveraftertensofthousandswerekilledinwidespreadflooding.Afterseveralfalsestarts,workbeganinearnestin1979.AdvocatessayChina'sdevelopmentdependsonit.Theysayitwillprovideacleansource
3、ofenergyforfuturegenerations.Butcriticssayitcouldbeamonumentalecologicaldisaster.Thedam'ssluicegateswereclosedonJune1,2003,allowingthereservoirbehindittobeginfilling.ByJune10,2003,thewaterwas135metresdeep,andit'sexpectedtobe175metresdeepby2009.FactsThe16-yearprojectisd
4、uetobecompletedin2009.Theriver'slevelisexpectedtoriseto175metres.Bymid-June2003thedamwasholdingback12billioncubicmetresofwater.Thedam'sstoragecapacityisnearly40billioncubicmetres.Itwillcreatea658-sq.-kmreservoir.Itsconcretewallis192metreshigh.Ithasatotalof22sluicegates
5、.Itwillhave26700-megawattturbinegenerators.Theyareexpectedtoproduce18.2millionkilowattsby2009.ElevenofthereactorswereinplaceasofJanuary2005.Ithastheworld'slargestlocksystem,6?kilometresinlength.Thelockliftsandlowersshipsinfivestages.ThedamislocatedinYichang,inthecentra
6、lprovinceofHubei.It'sChina'sbiggestengineeringprojectsincetheGreatWallwasbuiltmorethan2,000yearsago.Totalprojectedcost:180billionyuan($26.5billion).Locationof‘Sanxia’AmanfishesaswaterflowsthroughwaterdiversionholesoftheThreeGorgesDamontheYangtzeRiverincentralChina'sHub
7、eiProvince,June11,2003.Some10waterdiversionholeswereopenedtoreleasewater.ThewaterleveloftheThreeGorgesReservoirreached135metres(433feet)onJune10.(APPhoto/Xinhua,DuHuaju)TwomencarrybrickstoabargeatthetemporarydockatWushan,inthemiddleoftheThreeGorgesontheYangtzeRiverince
8、ntralChina,June6,2003.Lowerlyingareasofthetownhavebeendemolishedinpreparationfortheincreaseinthewaterlevelasthecontro
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