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1、ChinaOceanEngineering,Vol.21,No.2,pp.255-2662007ChinaOceanPress,ISSN08905487CharacteristicsofWaterandSedimentExchangeBetween*YangtzeEstuaryandHangzhouBayaa,c,1KONGJun(孔俊),SONGZhiyao(宋志尧)bbXIAYunfeng(夏云峰)andZHANGWeisheng(章卫胜)aStateKeyLaboratoryofHydrologyWaterResourcesandHydraulicE
2、ngineering,CollegeofOcean,HohaiUniversity,Nanjing210098,ChinabNanjingHydraulicResearchInstitute,Nanjing210029,ChinacKeyLaboratoryofVirtnalGeographicEnvironment(MinistryofEducation),NanjingNormalUniversity,Nanjing210097,China(Received25June2006;accepted18September2006)ABSTRACTBasedonthe2
3、DflowandsedimentnumericalmodeloftheYangtzeEstuaryandtheHangzhouBay,thecharacteristicsofwaterandsedimentexchangeintheirjointwatersisstudiedthroughquantitativecalculationandanalysisofthecharacteristicsofwaterflowandsedimenttransportation.Theresultsshowthatthereisperiodicalwaterandsediment
4、exchangeinthisjointwaters,thatthenetwaterexchangeappearsmainlybetween0~6mdepth(theoreticaldatumplane,thesamebelow)offshoreandthemaximumisnearthedepthof2m,andthatthenetsedimentexchangemainlyappearsbetween0~5mdepthandthemaximumisnearthedepthof3m,indicatingthattherangeofwaterflowpassageisd
5、ifferentfromthatofsedimenttransportfromtheYangtzeEstuarytotheHangzhouBay.Combinedwiththeresultsofnumericalsimulation,thispaperalsoanalyzesthehydrodynamicalmechanisminfluencingwaterandsedimentexchangebetweentheYangtzeEstuaryandtheHangzhouBay,includingtidalfluctuation,tidalcurrentkinetic
6、energy,tideinducedresidualcurrentandthetraceofwaterparticles.Finally,thesedimenttransportationpassageontheNanhuitidalflatisdiscussed,andtheresultsshowthatsedimentistransportedintotheHangzhouBayfromthesouthsideofShipilei,whilesedimentisbroughtbacktotheSouthChanneloftheYangtzeEstuaryfro
7、mthenorthside.Keywords:tidalfluctuation;residualcurrent;tidalflowkineticenergy;tidalcurrentflux;sedimenttransportflux1.IntroductionTheYangtzeEstuaryandtheHangzhouBayarebothlocatedintheeasterncoastalareaofChina.Theyareadjacenttoeachotherandhavethesamegeologicalconditionine
