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Numericalsimulationoficetransportandaccumulationprocessin
ToudaoguaireachoftheYellowRiver
2
1
1
3
LIChao,JIXuefei,ZHAOShuixia,HungTaoShen
(1.CollegeofWaterConservancyandCivilEngineering,InnerMongoliaAgriculturalUniversity,Hohhot 010018,China;
2.InstituteofWaterResourcesforPastoralarea,MinistryofWaterResources,Hohhot 010020,China
3.DepartmentofCivilandEnvironmentalEngineering,ClarksonUniversity,Potsdam,NewYork 13699,USA)
Abstract:Becauseofitsuniquechannelmorphologyandgeographiclocation,theToudaoguairiverreachisthe
mostvulnerabletoicedamformationintheInnerMongoliasectionoftheYellowRiver.Studyontherivericetrans
portandaccumulationprocessinthisreachisthekeytounderstandingtherivericeprocessandthemechanismof
icedammingformationintheInnerMongoliasection.Thewinterfreeze - upprocessoftheToudaoguaireachfrom
2020to2021wassimulatedandvalidatedbasedonthecoupledtwo - dimensionalfiniteelementhydrodynamicmodel
andDPMrivericedynamicsmodel.Theinfluencingfactorsofthefreeze - upprocesshavebeendiscussed ,likehy
draulicconditions ,iceconcentration,andchannelmorphology.ResultsshowthatcomparedwiththeGuanniuju
bend ,theShisifenzibend,whichhasalargebendrateandahighdegreeofnarrowing,ismorelikelytoformice
jamming ,andthesmallertheflowrate,themoreobvioustheicejamseffectis,andthefastertheicecoverdevelops
upstream.Whentheiceconcentrationislessthan0.4 ,noicejam occursinthestudysectionundervariousflow
rates;whentheiceconcentrationincreasesto0.4,thesurfaceicefirstformsicejam atthebendoftheShisifenzi
wherethebendingratecoefficientislarge ,andwiththefurtherincreaseoficeconcentrationandflowrate,theice
runthatdivesandmovesdownstreamalsoformsicejamatthebendoftheGuanniujubend,therefore,theicecon
centrationthatformsicejamintheToudaoguaisectionoftheriver.Theicewatercoupledtwo - dimensionaldynamics
modelcansimulatethehydrauliccharacteristics ,icethicknessgrowthandriverclosurepatternofthenaturalriver
duringtheprocessoficetransportandaccumulation,revealingtherelevantfactorsandmechanismsaffectingtheriver
iceprocess ,andprovidingtechnicalsupportforthepreventionandmitigationoftheYellowRiverInnerMongolia.
Keywords:InnerMongoliasectionofYellowRiver;rivericetransport;icejam;rivericedynamics;thenumer
icalsimulation
(责任编辑:李福田)
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