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                                 ApplicabilityofDARMAmodelinstochasticsimulationof
                                                dailyprecipitationinChina

                                                                                1,2
                                                                     1,2
                                       1,2
                                                       1,2
                          ZENGWenying ,SONGSongbai ,KANGYan ,MARui ,GAOXuan                  1,2
                       (1.CollegeofWaterResourcesandArchitecturalEngineering,NorthwestA&FUniversity,Yangling 712100,China;
                         2.KeyLaboratoryofAgriculturalSoilandWaterEngineeringinAridandSemiaridAreas,MinistryofEducation,
                                           NorthwestA&FUniversity,Yangling 712100,China)
                  Abstract:TheuniversalityofDARMAmodelinsimulatingdailyprecipitationinChinaisstudiedtoimprovethe
                  randomsimulationaccuracyofdailyprecipitation.Inthispaper,theDARMA(1,1)modelisestablishedtosim
                  ulatetheoccurrenceofdailyprecipitationeventsbyusingdataseriesselectedfrom 811meteorologicalstationsin
                  Chinesemainland.Theautocorrelationcoefficientandthedryandwetrunprobabilitydistributionaretested.The
                  dailyprecipitationofdifferentwetanddryrunisgeneratedrandomlyaccordingtotheGammafunction ,andcom
                  paredwiththeDAR(1)model.Theresultsshowthatmorethan50% oftheprecipitationinChinaismulti - day
                  precipitationeventsof2daysandabovewithslowdecayautocorrelationcoefficient ,conformingtothecharacteris
                  ticsofDARMAmodel.Theaccuracyofdrywetrunprobabilitydistributiongeneratedbysimulationisbetterthan
                  thatofDARmodel ,andtheadvantageismoresignificantwiththeincreaseofprecipitation.Exceptforthemean
                  value ,thestatisticaleigenvaluesofsimulationseriesarebetterthanDARmodel.TheDARMAmodelisapplicable
                  tothestochasticsimulationofdailyprecipitationinChinesemainland ,andisafeasiblestochasticsimulationmodel
                  fordailyprecipitation.
                  Keywords:DARMA;dailyprecipitation;probabilitydistributionofwetanddryrun;Gammadistribution;sto
                  chasticsimulation


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