Page 92 - 《水资源与水工程学报》2022年第5期
P. 92
! 33 " ! 5 # & ' ( ) & * + , - Vol.33No.5
2022 $ 10 % JournalofWaterResources&WaterEngineering Oct.,2022
DOI:10.11705/j.issn.1672-643X.2022.05.11
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HIJKL:TV122 MNOPQ:A MRSL:1672643X(2022)05008808
Floodpeakresponsetothespatialandtemporalheterogeneity
ofrainfallundernaturalconditions
1,2
2
1,2
1
3
CHENGuihuang,TANQian ,ZHUZhihua,CAIYanpeng ,WANGShuping
(1.KeyLaboratoryforCityClusterEnvironmentalSafetyandGreenDevelopmentoftheMinistryofEducation,SchoolofEcology,
EnvironmentandResources,GuangdongUniversityofTechnology,Guangzhou510006,China;2.SouthernMarineScienceand
EngineeringGuangdongLaboratory(Guangzhou),Guangzhou511458,China;3.CollegeofWaterResourcesand
CivilEngineering,ChinaAgriculturalUniversity,Beijing100083,China)
Abstract:Tosolvetheproblemoftheadverseinfluenceofrainfallspatiotemporalheterogeneityonflood
peakinthebasinundernaturalconditions,afloodfrequencyanalysismethodisproposedbasedonthe
combinationofRainyDayandSWATmodel.TakingtheDongjiangRiverBasinasanexample,thedesign
rainfallofthebasinunderdifferentreturnperiodsisproposedusingRainyDaymodel ,andthenrecon
structedintosixrainfallscenarioswithdifferenttemporalandspatialheterogeneity.Finally,theabove
scenariosareusedasinputintheSWATmodeltoquantitativelysimulatetheresponseofthefloodpeaks
ofthebasintothespatialandtemporalheterogeneityofrainfallundernaturalconditions.Itisfoundthat
whenthedifferenceoftemporalheterogeneitybetweentwoscenariosisnarrowingdowntozero,thediffer
encebetweenthefloodpeaksincreaseswiththeincreaseofspatialheterogeneity ,withthemaximumvalue
3
3
exceeding700m /sandtheaveragevalueexceeding300m /s.Whereaswhenthedifferenceofspatial
heterogeneitybetweentwoscenariosisnarrowingdowntozero,thedifferencebetweenthefloodpeaksin
3
creaseswiththeincreaseoftemporalheterogeneity ,withthemaximumvalueapproaching700m /sand
3
thetheaveragevalueexceeding200m /s.Underthesamereturnperiod,thefloodpeaksgeneratedby
thescenarioswithhighspatiotemporalheterogeneityofrainfallarehigherthanthatoftheotherscenarios ,
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