Page 205 - 《水资源与水工程学报》2024年第5期
P. 205
!35 "!5 # & ' ( ) & * + , - Vol.35No.5
2024 $ 10 % JournalofWaterResources&WaterEngineering Oct.,2024
DOI:10.11705/j.issn.1672-643X.2024.05.24
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MNOPQ:S152.8 RSTUV:A RWXQ:1672643X(2024)05020108
Monitoringofredsoildehydrationprocessbysingleprobeheatpulsemethod
1
1
2
1,2
1
WEIHaoyan ,GENGNing,CHENGJingqing,KONGQiongju,HUYou,LIMin 1,2
(1.KeyLaboratoryofPoyangLakeWaterResourcesandEnvironmentofJiangxiProvince,JiangxiAcademyofWaterScience
andEngineering,Nanchang330029,China;2.KeyLaboratoryofAgriculturalSoilandWaterEngineeringinAridand
SemiaridAreasofMinistryofEducation,NorthwestA&FUniversity,Yangling712100,China)
Abstract:Theinsitumonitoringofsoildehydrationprocessisofgreatsignificanceforsoilandwaterre
sourcesmanagement,naturaldisasterwarning,anddisasterpreventionandreductioninredsoilareas.
Theheatpulsemethodiscommonlyusedforinsitumeasurementofsoilwaterandthermalcharacteris
tics ;however,cracksarelikelytooccurwhenredsoilloseswater,itisstillunclearwhetherthesingle
probeheatpulsemethodcanaccuratelymonitorthedehydrationprocess.Thisstudysimulatedthecontin
uousdehydrationprocessofsoilfromsaturationtodryingbylaboratoryexperiments ,andusedtimedo
mainreflection(TDR)methodasastandardtoverifytheaccuracyofheatpulsemethodinmonitoring
soildehydrationprocess.Inthemeantime ,theinfluenceofsoilcrackgenerationontheperformanceof
singleprobeheatpulsemethodwasevaluated.Theresultsshowedthatwithsoildehydration ,thesoil
thermalconductivity (K)decreasedfrom1.8to1.1W/(m·K),thethermaldiffusionrate( α )in
-9
-9
2
creasedfrom10×10 to30×10 m /s,andthespecificheatcapacity(C)decreasedfrom180×10 6
6
to40×10 J/(kg·K).Inaddition,thecontactthermalconductivity(H)exhibitedasteplikevariation
characteristicwithsoildehydration ,whichwasconsistentwiththeturningpointsofsoilwatercontent
changerate ,andtheHvalueindicatedtheformationofsoilcracks.ComparedwiththeresultsofTDR,
theMAEandRMSEvaluesofthesoilwatercontentduringthedehydrationprocessmonitoredbythesin
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