Page 112 - 《水资源与水工程学报》2022年第2期
P. 112

!33 " ! 2 #                       & ' ( ) & * + , -                               Vol.33No.2
               2022 $ 4 %               JournalofWaterResources&WaterEngineering                 Apr.,2022

            DOI:10.11705/j.issn.1672-643X.2022.02.14


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                 HIAJK:TV213   LMNOP:A    LQRK:1672643X(2022)02010807

                     Postprocessingmethodofnumericalensemblerainfallprediction

                                                           1,2
                                                                         3
                                               HAOFuliang ,WANGXu
              (1.SchoolofHydraulicandEnvironmentalEngineering,ChangshaUniversityofScience&Technology,Changsha410114,China;
                2.KeyLaboratoryofWater-SedimentSciencesandWaterDisasterPreventionofHunanProvince,Changsha410114,China;
                          3.SchoolofEnvironmentalScienceandEngineering,TianjinUniversity,Tianjin300072,China)

                 Abstract:UsingtherainfallpredictiondataoftheGlobalEnsembleForecastSystemfromApril1toSep
                 tember30,2017andtherainfallobservationdatafromthemeteorologicalstationsintheYalongRiverBa
                 sin,therainfallpredictiondatawascalibratedbytheensemblemodeloutputstatisticsbasedonthegener
                 alizedextremevaluedistribution ,andthecalibrationresultsobtainedfromtwomodelswerecomparedand
                 analyzed.Theresultsshowthattheensemblemembermeancalibrationmodelcaneffectivelyaddressthe
                 problemofrainfalloverestimation ,whichisalwaysthecasewiththeoriginalpredictionmodel.Further
                 more ,itspredictionresultissignificantlybetterthanthatoftheensemblemembercalibrationmodel,
                 whichislimitedbytheoverfittingproblemduetotheincreaseofmodelparameters,thusthelatterisnot
                 applicabletotherainfallpredictionoftheYalongRiverBasin.However ,theaccuracyoftheprediction
                 resultsoftheensemblemembermeancalibrationmodelvariessignificantlyindifferentbasinsandtendsto
                 underestimatethelargerainfallsinthebasin.Therefore,furtherresearchonthismethodshouldbecon
                 ductedtargetingatimprovingthepredictionaccuracyofextremerainfalls.
                 Keywords:ensembleforecastsystem;statisticalpostprocessingtechnology;rainfallprediction;bias
                 correction ;numericalmodellingform;theYalongRiverBasin

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