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
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FGHIJ:TV125;P426.6 KLMNO:A KPQJ:1672643X(2025)02002911
EvaluationofMSWEPformodellingextremeprecipitationinthecoastal
regionofChina’smainlandanditscorrectionmethod
1
1,2
LIJiangxia ,RENNingdan,DENGZhiyuan 1
(1.SchoolofHydraulicandOceanEngineering,ChangshaUniversityofScience&Technology,Changsha410114,China;
2.KeyLaboratoryofWater-SedimentSciencesandWaterDisasterPreventionofHunanProvince,Changsha410114,China)
Abstract:Multisourceweightedensembleprecipitation(MSWEP)isahighresolutiongriddedprecipi
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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