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第1页共12页编号：时间：2021年x月x日书山有路勤为径，学海无涯苦作舟页码：第1页共12页DiscussionabouttransformationofcurveconduitofYellowriverTiexieprojectLiuyouzhan(westernhenanYellowRiverAffairsBureau)Abstract:Tiexieprojectwaspassivelybuiltduetorushtodealwithemergency,itisseparatedtotwoup-downbendinnorthgatedam(number10dam).Untillast70centuries,stuffanddescendprojectswererespectivelybuiltinupanddownthedam.Thoughthebuildingofprojectscann’ttransportdownstreamthe10dam,itwassuitedtotemporalwater-sedimentconditions,theriverwasinaperfectcondition.Afterthe“96.8”flooding,theTiexieproject’sinflowpointascendcontinually,sincetheprojectdidn’tdevelopaintegratesmoothbendandwater-sedimentconditionsarechanging,thedisadvantageriverconditionsthatLucunprojectisnearriverbegantoappear.TosettleTiexieprojecttransporteffectively,theemphasesofprojectbendishowtoimprove入溜conditions,makestuffprojectcomplete,makeprojectaintactsmoothbendanduseriverbeddredgeuptoimproveinflow,streamguidanceandoutflowconditionsofriverbedproject.Keywords:Tiexieproject;bend;fluctuatingriver;riverregulation;Yellowriver1thequestionsputforwardYellowriverTiexieprojectisbetweenBaiheandHuimengcountry,Mengjincounty,24kmdownstreamxiaolangdidam,southbankofYellowriver,itisuptoBaipoprojectanddowntoLucunproject,7.45kmtotallengths.TiexieprojectisininitialsectionsdownstreamYellowriver,itplaysaimportantroleincontrollingfloodandrivercircumstances.Inalongtime,becauseTiexieproject’splaneconditionisnotsmooth,outletflowisunsteady,oftenswingsinabout2kmnearLucunproject,thismaketherivercircumstancesbyLucunprojectisveryunsteadyandonlyitsdownsectionisnearriverafter1996.thelongtimeunsteadyofLucunprojectmustdisturbriverconditionsdownstreamandmaketheresultsofriverimprovementfail.SincecomplexriverboundariesofTiexieproject,riverisrestrictedtobridgeandbeachandcann’tadjustitself.Meanwhile,withtheconstructionofxiaolangdi,qixiayuanreservoir,taiaohighspeedyellowriverroadandsoon,riverregimehavesomenewthingsandproblems.Sospeedingatconstructingriverregulation,rebuildingTiexieproject,buildingsmoothandplanflowguidancebendtomakethemsuitedtonewwater-sedimentboundaryconditonsarekeysofthisriverreachregulationandemergentneedsofdownstreamwanderingriverregulation.2.basicconditionsofriverway2.1characteristicsofriverwayThereachofYellowriverTiexieprojectisreachthatistransitedfrommountainareasrivertofluvialplain.Inmountainareas,waterflowdiffusesandvelocityisslow,sand-cobblebedloadwhicharebroughtfromupperravineriverbedcanbedepositedinriversection,sosand-cobbleriverislandthathasseveralflowbranchesdistributaryisdevelopedupperYellowriverroadbridge,LuoYang.Riverislandisconstitutedofscreeandrudesand,itisinthenorthcenterofriverbedandis1m-5mtallerthanriverbed,itstopissandyroamandbottomisroundgravelandscree.Generally,riverbediscoveredbysand-cobble,graindiameterfrom20to200mm,thewidthofriveris2500m,widthofmainriverchannelis500-700m,slopeofriverbedis0.5‰~0.7‰,thedepthofscreedownLuoYangbridgeisgraduallyincreased,itsriverbedisconsistofrudesand,beachisunsteadyandslopeofriverwayis0.265‰.2.2characteristicofwater-sedimentAccordingtoXiaolangdihydraulicstationdatum,theaverageannualdischargeoftheriver第2页共12页第1页共12页编号：时间：2021年x月x日书山有路勤为径，学海无涯苦作舟页码：第2页共12页regimeis378.38hundredmillionm3from1956to1995,thesedimentdischargeis11.4hundredmilliontons.A...