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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                       Floodpeakresponsetothespatialandtemporalheterogeneity
                                       ofrainfallundernaturalconditions

                                                  1,2
                                                                 2
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                                      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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