Page 33 - 《水资源与水工程学报》2025年第2期
P. 33

!36 "!2 #                         & ' ( ) & * + , -                               Vol.36No.2
               2025 $ 4 %               JournalofWaterResources&WaterEngineering                 Apr.,2025

            DOI:10.11705/j.issn.1672-643X.2025.02.04


                          MSWEP ´4 ¡=FvÌVWXs}

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                 FGHIJ:TV125;P426.6   KLMNO:A    KPQJ:1672643X(2025)02002911
                 EvaluationofMSWEPformodellingextremeprecipitationinthecoastal
                            regionofChina’smainlandanditscorrectionmethod


                                                                 1
                                                 1,2
                                      LIJiangxia ,RENNingdan,DENGZhiyuan          1
                (1.SchoolofHydraulicandOceanEngineering,ChangshaUniversityofScience&Technology,Changsha410114,China;
                2.KeyLaboratoryofWater-SedimentSciencesandWaterDisasterPreventionofHunanProvince,Changsha410114,China)
                 Abstract:Multisourceweightedensembleprecipitation(MSWEP)isahighresolutiongriddedprecipi
                 tationproduct ,inthisstudyitssimulationaccuracyfortheprecipitationinthecoastalareaofChina’s
                 mainlandisevaluatedindetail.Thisevaluationisbasedontheprecipitationdatacollectedfrom96mete
                 orologicalstationslocatedinthecoastalprovincesfrom1979to2020.Inthisstudy,weadoptedCress
                 manalgorithmtocorrecttheMSWEP ,analysedthesensitivityofthesearchradius(R)tothecorrection
                 results ,andevaluatedtheeffectivenessofthecorrectedMSWEPforprecipitationsimulation.Theresults
                 showthatMSWEPtendstounderestimatethedailyprecipitationacrosstheentirecoastalregion ,witha
                 slightlybetterperformanceforthenorthernprovincesthanthesouthernprovincesandsignificantlyunder
                 estimatedresultsinextremeprecipitationperiod.Duringthetyphoonrainstormperiod,theoveralldata
                 errorisunacceptablylargeandtheunderestimationbecomesmoreobviouswithincreasingprecipitation.
                 Accordingtothesensitivityanalysisof R,theoptimalvalueofRis2.0°andapplyingcorrectionthree
                 timesyieldsthebestresults.TheoverallperformanceofthecorrectedMSWEPforprecipitationsimulation
                 isenhanced,anditsaccuracyforextremerainstorm simulationissignificantlyimproved.Theresearch
                 outcomescanprovideadatasupportforprecipitationrelatedresearch ,aswellasdisasterpreventionand
                 mitigationinthecoastalareaofChina.
                 Keywords:precipitation;extremeprecipitationmodelling;MSWEP;Cressmanalgorithm;coastalarea
                 ofChina



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