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1、YangtzeRiverBasininBriefTheYangtzeRiver,traversingtheWest,MiddleandEastChina,isthelargestriverinthecountryandthethirdlargestintheworld.Itoccupiesthemostimportantstrategicpositionforallocationofwaterresourcestosupporteco-socialsustainabledevelopmentinChina.1.NaturalStatusThemainstre
2、anoftheYangtzeRiveroriginatedfromthesouthwesternsideofthesnow-CappedMountainoftheGeladandong—themainpeakofTanggulaMountainsontheQinghaiandTibetPlateau,passingthroughChina’s11provinces(orautonomousregionsorthemunicipalitiesdirectlyundertheCentralGovernment),includingQinghai,Tibet,Yu
3、nnan,Sichuan,Chongqing,Hubei,Hunan,Jiangxi,AnhuiandJiangsu,andfinallyentersintotheEastChinaSeainShanghai,withatotallengthofmorethan6300kmandtotalfallheadofmorethan5400m.Itstributariesextended8provincesandautonomousregionsincludingGansu,Sanxi,Henan,Guizhou,Guangdong,Guangxi,Fujianan
4、dZhejiang.TheYangtzebasininvolvesacatchmentareaof1.8millionkm2,accountingfor18.75%ofChina’stotal.TheYangtzeRiverhasitssourcestreamfromtheTuotuoRiver,afterconvergingwiththesouthsourceDangquRiveritiscalledTongtianRiver,andthenitisnamedJinshaRiveraftermergingwiththenorthsourceChumarRi
5、verandjoinedbyBatangRiveratYushu,andfinallyitisnamedtheYangtzeRiverafterjoinedbyMinjiangRiveratYibininSichuangProvince.FortheYangtzeRiver,thereachbetweenYibinandYichangiscalledChuanjiangRiver;thereachbetweenZhichengandChenglingjiiscalledJingjiangRiver.Withalargewatersystemandnumero
6、ustributariesandlakes,theYangtzeRiverBasinpossesses8maintributarieswithacatchmentareaofmorethan80000km2,includingYalongRiver,MinjiangRiver,JialingRiver,WujiangRiver,YuanjiangRiver,XiangjiangRiver,HanjiangRiverandGanjiangRiver,amongthemJialingRiveristhebiggestintermsofarea,MinjiangR
7、iveristhelargestintermsofdischarge,andHanjiangRiveristhelongest(Table1).Inaddition,thereare4largefreshwaterlakes,namelyDongtingLake,PoyangLake,ChaohuLakeandTaihuLakeintheYangtzebasin,ofwhichPoyangLakeisthebiggestinChina(Table2).Table1ThemaintributariesoftheYangtzeRiverNameofTributa
8、ryCatchmentArea(104km2)Mea