Page 48 - 2024年第55卷第12期
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Evolutionarylawofhydrologicalanddroughtstatesinlargebasinsof
Chinaundertheinfluenceofhumanactivities
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WUFan ,YANGXiaoli ,RENLiliang ,CUIZhouyu 1,2
(1.TheNationalKeyLaboratoryofWaterDisasterPrevention,HohaiUniversity,Nanjing 210098,China;
2.CollegeofHydrologyandWaterResources,HohaiUniversity,Nanjing 210098,China)
Abstract:Duetothecompoundedimpactofclimatechangeandhumanactivities,theoccurrenceofextreme
droughteventsposesakeyconstrainttosocietaldevelopmentandthreatensecologicalsecurity.Quantifyingthein
fluenceofhumanactivitiesonthehydrologicaldroughtevolutionprocessiscrucialforformulatingrationalwaterre
sourceallocationstrategiesandmitigatingtheimpactsofdroughtonbothhumansocietyandecosystems.Toaddress
this ,ourstudycoupledthePCR - GLOBWBmodel,whichcapturesthenuancedeffectsofhumanactivities,with
theSRI - RRVframework.Thiscouplingenabledaquantitativeassessmentofthespatio - temporalvariationsinthe
impactofhumanactivitiesonthehydrologicaldroughtevolutionprocessanddroughtconditionsinmajorriverbasins
acrossthecountry.Theresultsindicatethathumanactivitiesgenerallyexacerbate (alleviate)hydrologicaldrought
inthenorthern(southern)regionsofChina.Humanactivitieshaveintensifiedtheexpansionofnationwidedrought
areasbefore1990 ,buthavereduceddrought - affectedareasinsouthernregionsafter1990.Takingintoaccount
humaninfluence ,thedroughtseverityintheYellowRiver,HuaiheRiver,andHaiheRiverbasinshassignificant
lyworsened,whiletheSRI - RRVgradesintheYangtzeRiver,PearlRiver,andsoutheasternbasinshaveim
proved.Thisstudyhighlightstheregionaldisparitiesintheimpactofhumanactivitiesonhydrologicaldrought ,em
phasizingtheneedfortailoredwaterresourcemanagementmeasuresbasedonthecharacteristicsofdifferentriver
basinstoalleviatethelossescausedbydrought.
Keywords:PCR - GLOBWBhydrologicalmodel;humanactivities;hydrologicaldrought;RRVframework
(责任编辑:耿庆斋)
(上接第 1447页)
MultiscalefiniteelementmethodwithJUMPvectorforsimulating
Darcyvelocityattheinterfaceofmedia
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XIEYifan ,SUZhenning ,NANTongchao ,WUJichun,XIEChunhong,LUChunhui
(1.TheNationalKeyLaboratoryofWaterDisasterPrevention,HohaiUniversity,Nanjing 210098,China;
2.CollegeofWaterConservancyandHydropowerEngineering,HohaiUniversity,Nanjing 210098,China;
3.YangtzeInstituteforConservationandDevelopment,HohaiUniversity,Nanjing 210098,China;
4.SchoolofEarthSciencesandEngineering,NanjingUniversity,Nanjing 210023,China;
5.DepartmentofMathematics,NanjingUniversity,Nanjing 210093,China;
6.CollegeofHydrologyandWaterResource,HohaiUniversity,Nanjing 210098,China)
Abstract:AJUMPvectormultiscalefiniteelementmethod(MSFEM- J)forsimulatingDarcyflowvelocityatthe
interfaceofmediaisproposed ,whichcansolvetwoshortcomingsofcurrentmethodssuchasfiniteelementmeth
odwhensimulatinggroundwaterproblemswithinterfaces.First ,thecurrentmethodneedstoaccuratelydissect
andcharacterizetheheterogeneityofmediatoensuretheaccuracyofsolution,andconsumeshugecomputational
resources;Secondly,thecurrentnumericalmethodcannotensurethattheDarcyvelocityattheinterfaceofthe
mediumobeystherefractionlaw,thatis,thenormalvelocityiscontinuousandthetangentialvelocityispropor
tionaltothepermeabilitycoefficient.MSFEM- Jfirstsignificantlyimprovesthecalculationefficiencyofthe
groundwaterheadandDarcyvelocityprocessesthroughthemulti - scalefiniteelement(MSFEM)basisfunction;
Then,theJUMPvectorisconstructedbasedontherefractionlaw,andtherightendtermoftheweaksidenode
oftheinterfaceisiterativelycorrecteduntilconvergence,sothattheDarcyvelocityattheinterfacemeetsthere
fractionlaw.ThenumericalexperimentsshowthattheDarcyvelocitysimulatedbyMSFEM- Jinthispapercon
formstotherefractionlawattheinterfaceofthemedium ,andhascontinuityatotherlocationsinthestudyarea.
Theaccuracyofthismethodishigherthanthatofthecurrentmethodoffinedissection ,anditscalculationcon
sumptionisonlyabout2% ofthatofthesamemethod.
Keywords:groundwaternumericalsimulation;multiscalefiniteelementmethod;Darcyvelocity;medium inter
face ;JUMPvector
(责任编辑:李 娜)
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