Page 48 - 2024年第55卷第12期
P. 48

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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