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Physicalschemeandparametrizationbyusingairtemperatureandicethicknessto
improveaccuracyofGPRpropagationvelocityinYellowRiverice
3,4
3,4
1
2
1
LIZhijun,LIChunjiang,YANGYu,ZHANGBaosen ,DENGYu ,LIGuoyu 5
(1.StateKeyLaboratoryofCoastalandOffshoreEngineering,DalianUniversityofTechnology,Dalian 116023,China;
2.DepartmentofPreparatoryCourse,ShenyangInstituteofEngineering,Shenyang 110136,China;
3.YellowRiverInstituteofHydraulicResearch,YRCC,Zhengzhou 450003,China;
4.ResearchCenteronLeveeSafetyDisasterPrevention,MWR,Zhengzhou 450003,China;
5.StateKeyLaboratoryofFrozenSoilEngineering,NorthwestInstituteofEco - EnvironmentandResources,
ChineseAcademyofSciences,Lanzhou 730000,China)
Abstract:Theunfrozenfreeandunfreewateroccurinwaterfilmamongtheicecrystalsinthermalgrowthiceand
consolidatediceblocksintheYellowRiver,anditscontentvariesewiththeicetemperature.Theoretically,the
propagationvelocityofradarwavedependsontheicecrystalconstructionandcompositions ,however,theunfrozen
wateramountaffectsthevelocityobservably.Theunfrozenwateramountdependsonicetemperature;andtheice
temperatureiscontrolledbyairtemperature,radiationandicethicknessmainly.Aftertheanalyzingoflocalair
temperatureandtheGPRicethicknessatShensifenzi,YellowRiverinthewinterof2020 - 2021,itwasconfirmed
thattheairtemperatureisthekeyfactoraffectingtheunfrozenwateramount.Anarrayof1251simulatedice
thicknessbyusinga1 - Dthermalicemodelwithairtemperature ,solarradiation,windspeedandcloudamount
afterobtainingtheheatfluxbetweenice - waterfortheYellowRivericereliedon13drilledicethicknessdata.
Basedonthesestudies,thestatisticalrelationshipsofthepropagationvelocitiesingranularandcolumnaricewith
airtemperature ,andwithairtemperatureaswellasicethicknessforairtemperatureincreasinganddecreasing
processeswereperformed.Finally ,theserelationshipscanbecomeparametrizationsofadynamicalerrorcorrection
algorithmofpropagationvelocityofGPR combinedwithairtemperatureandicethicknesswasproposed.Theses
formulacouldbeusedastheparameterizationfunctioninsteadofaconstantpropagationvelocityofGPR forthe
suspendedfixed - pointradartoobtainhigheraccurateradarmeasuredicethickness.Followingthefactsoffrazil
undericeandnon - consolidatediceblocksinicejamsalongtheYellowRiver ,thedifferentresearchcasesforthe
radaricethicknessmeasurementsweresuggested.
Keywords:YellowRiverice;dielectricconstant;GPRwavespeed;icethickness;parametrization
(责任编辑:李福田)
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