Page 178 - 《水资源与水工程学报》2025年第1期
P. 178

!36 "!1 #                         & ' ( ) & * + , -                               Vol.36No.1
               2025 $ 2 %               JournalofWaterResources&WaterEngineering                 Feb.,2025

            DOI:10.11705/j.issn.1672-643X.2025.01.19


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                              Effectofmoistureboundariesonthehydrothermal
                                        stateofpermafrostembankments

                                             1,2
                                                                           1,2
                                                           2,3
                              ZHANGYaning ,MINGFeng ,HANQingyu ,WEIXiaobin                4
               (1.KeyLaboratoryofCryosphericScienceandFrozenSoilEngineering,NorthwestInstituteofEcoEnvironmentandResources,
               ChineseAcademyofSciences,Lanzhou730000,China;2.UniversityofChineseAcademyofSciences,Beijing100049,China;
                       3.QinghaiProvincialTrafficControlConstructionEngineeringGroupCo.,Ltd.,Xining810003,China;
                            4.CollegeofCivilEngineering,HebeiUniversityofEngineering,Handan056038,China)
                 Abstract:Inthecontextofglobalwarming,theprecipitationintheTibetanPlateauregionkeepsincreas
                 ing.Excessiverainfallcontributestothechangeofthemoistureboundary ,soitisnecessarytoexplore
                 theinfluenceofmoistureboundaryonthehydrothermalprocessofpermafrostembankments.Basedonthe
                 theoryofthermalconductionandseepageinunsaturatedsoils,thisstudyestablishedacoupledhydrother
                 malmodelofpermafrostembankmentsconsideringmoisturemigrationandphasechange.Subsequently ,a
                 moistureboundaryintegratingrainfallandevaporationwasintroducedintothenumericalmodel.Thesim
                 ulationresultsofwatercontent ,temperature,andfluxesbythemodelwerethencomparedwiththoseby
                 themodelwithoutamoistureboundary.Theresultsshowthatneglectingthemoistureboundaryinthe
                 warmseasonwillunderestimatethewatercontentandoverestimatethesoiltemperature.Afterintroducing
                 themoistureboundary ,theshallowliquidwatercontentoftheembankmentfluctuatesintherangeof
                             3
                                 3
                0.06-0.11m /m inthewarmseason,whichcanincreaseupto36.14% comparedwiththatwithouta
                 moistureboundary.Rainwatersensibleheatandevaporativelatentheatredistributethesurfaceenergy ,so
                 thatthethermalconductionfluxdecreases ,resultinginamaximumtemperaturedropof0.75℃ inthe
                 averagetemperatureoftheembankmentshallowlayerinthewarmseasoncomparedwiththatwithouta
                 moistureboundary.
                 Keywords:permafrost;permafrostembankment;moistureboundary;hydrothermalstate;numerical
                 simulation
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