三峡大坝英语演讲

Thethreegorgesdamproject——2011022班第一组制作ThereasonconstructionBriefintroductionProsandConsThreeGorgesDamWaterresourcesoftheYangtzeRiverranksfirstintheworld,accountingformorethanhalfofthecountry'shydropowerresources.Itswatercontainstheenergyequivalentofburning50milliontonsofhigh-qualitycoal,inotherwords,beforetheconstructionoftheThreeGorgesDameveryyearfromthissectionoftheYangtzeRiver,50milliontonsofcoaldrainedawayinvain.1.ThereasonconstructionDevelopmentandutilizationofrichwaterresourcesintheThreeGorges,notonlypursuedthedreamofseveralgenerationsofChinesepeople,butalsohasbecomeoneofthecoretasksoftheconstructionoftheThreeGorgesProject.From1992to2009,theworld'slargestconcretecrystallization,risingproudlyfromChina'sYangtzeRiver,theThreeGorgesDamlengthofovertwokilometers,spent40,000workersandtook17yearstobuild,Whenthedamisfullyenabled,itwillproducemorethan200gigawattsofelectricity,equivalenttothesumoftheBritishnuclearpowerplant,isthepinnacleofthedamproject.2.BriefintroductionFloodcontrolcapacityoftheThreeGorgesReservoiroperationreservedforthe22.15billioncubicmeters,thereservoirfloodpeakflowcanbereducedupto27000-33000cubicmeters/second,istheworld'swaterconservancyprojects.32turbinesgeneratingcapacitysufficientfor60millionChinesepeopleuse,theThreeGorgesDamcanmaster22billioncubicmetersofwater.Thendischargedartificiallycontrolledmanner.3.ProsandCons3.1FloodprotectionGeneratingcapacityoftheThreeGorgesDamistheworld'shighest,however,thisisnotthemainreasonfortheconstructionofthedam.EveryoneknowsSeverefloodingintheYangtzeRiver,twothousandyears,thereareaboutaseverefloodeverydecade.Thedisasterin1931issevere,whichdestroyednearlytwomillionhomes,causingmorethan13milliondeaths.3.2ShippingThreeGorgesDamislocatedinoneofAsia'sbusiestriver,theYangtzeRiver，whichisChina'sveryimportantshippingwaterway,fromthecoastofShanghaitoYichang,connectallthewaytoChongqing,abouttransportingeighteenmillionpoundsofcargoannually.About170shipsneedtopassthroughthedamwhichismorethanonehundred-meters-highadayWiththeworld'sfirstdam,China'ssolutionistobuildtheworld'slargestshiplock，This113-meterhighShipliftcanhandleshipweighing3000tons,becomingtheworld'slargestshiplift.Amongtheconstructionoftheprojecthere,itisagreatproject。3.3AdverseeffectsontheenvironmentButthemanagementoffloodswillcauseseriousadverseeffectsontheenvironment.PreciousYangtzeRiversiltcannotflowbecauseofthedam,trappedinslowflowingwaterinthereservoir,quicklysinkingtotheriverbedandpiledup.YangtzeRiversiltationproblemisveryserious,whichmakeshundredsofmilesdownstreamwildlifecannotgetnutrientsfromthewater.Sludgewillendangerreservoir,theywillreducethecapacityofthereservoir,alsoaffectpowergeneration.WhentheThreeGorgesProjectended,itsscalemakesusshocking.Standingontheshouldersofengineeringhistorygiants,theThreeGorgesDamisindeedtheultimatehydroelectricdam.Comprehensivebenefitsitgenerateswillcontinuouslymakeagreatcontributiontoournation.4.ConclusionTHANKYOU!本组成员（按学号）：李明佳201100919肖思雨201102221胡佳纯201102224李烁201108411宋岳201108909王蒙蒙2011111022014.0616