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Thermalgrowthanddecayoficecoverundersnowcover
1
1
2
1
1
YANGKailin,GUOXinlei,WANGTao,DENGXiao,FUHui,GUOYongxin 1
(1.ChinaInstituteofWaterResourcesandHydropowerResearch,Beijing 100038,China;
2.TaiyuanUniversityofTechnology,Taiyuan 030024,China)
Abstract:Thethermalgrowthanddecayoficecoverundersnowcoverisanurgentresearchproblem,whichhas
importantpracticalvalueforbreak - updatepredictionandicefloodriskanalysisinareaswithfrequentsnowfallin
winter.Basedontheassumptionthatthethermalconditionsofthesnowcoverandtheicecoverarequasisteady
state ,thefunctionalrelationshipsamongthethermalgrowthanddecayratesoftheicecover,thesnowcoverthick
ness ,theicethickness,thenetheatfluxtransmittedbytheatmospheretothesnowsurfaceandthenetheatflux
transmittedbythewaterbodytothebottom oftheicecoverareestablished,includingsolarradiation,reflection
andtransmission,longwaveradiationsofthesnowsurfaceandtheatmosphere,evaporation - convectionofthe
snowsurface ,groundtemperatureoftheriverbedandotherfactors.Thetheoreticalformulasofsnowsurfacetem
peratureandicecoververticaltemperaturedistributionandthenumericalcalculationmodeloficecoverthermal
growthanddecaydevelopmentprocessareproposed.Finally,takingtheiceconditionsmeasuredintheMohesec
tionoftheHeilongjiangRiverasanexample,thepracticabilityoftheproposedmathematicalmodelforthethermal
growthanddecayoftheicecoverisverified ,andthevariationcharacteristicsofseveralimportantparameterswith
timeareanalyzed.
Keywords:snowcover;icecover;thermalgrowthanddecay;atmosphericheatexchange;riverbedgroundtemperature
(责任编辑:李福田)
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