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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KLMNO:P642.1;U416.1 PQRST:A PUVO:1672643X(2025)01017409
Effectofmoistureboundariesonthehydrothermal
stateofpermafrostembankments
1,2
1,2
2,3
ZHANGYaning ,MINGFeng ,HANQingyu ,WEIXiaobin 4
(1.KeyLaboratoryofCryosphericScienceandFrozenSoilEngineering,NorthwestInstituteofEcoEnvironmentandResources,
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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