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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


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