Page 56 - 《水资源与水工程学报》2023年第2期
P. 56

!34 " ! 2 #                       & ' ( ) & * + , -                               Vol.34No.2
               2023 $ 4 %               JournalofWaterResources&WaterEngineering                 Apr.,2023

            DOI:10.11705/j.issn.1672-643X.2023.02.07


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                 GHIJK:TV122. 1   LMNOP:A    LQRK:1672643X(2023)02005207
                     Floodcharacteristicsandriskanalysisofasmallwatershedinthe
                              LoessPlateauunderextremerainstorm conditions

                           ZHANGFan,HOUJingming,MAYongyong,WANGTian,JINGJing,
                                        ZHANGYe,DONGMeijun,ZHOUQingshi
             (StateKeyLaboratoryofEcohydraulicsinNorthwestAridRegionofChina,Xi’anUniversityofTechnology,Xi’an710048,China)
                 Abstract:Inordertostudythefloodcharacteristicsofsmallwatershedsunderextremerainstormcondi
                 tions ,atwodimensionalfullhydrodynamicnumericalmodelisusedtosimulatethefloodroutingprocess
                 ofasmallwatershed ,withwhichthehydraulicelementsoftypicalsectionsunderdifferentreturnperiods
                 werecalculated ,andthefloodriskanalysisofthewatershedwasconducted.Theresultsshowthatthe
                 peakflowgrowthratecorrespondingtothereturnperiodof500aisthelargest,upto51.38%,which
                 dropsdramaticallyto7.61% whenthereturnperiodisincreasedto1000a,becausethepeakflow
                 growthrateincreasesfirstandthendecreaseswiththeincreaseofrainfallreturnperiod.Moreover ,the
                 maximumwaterdepthincrementofeachsectionissmallerthanitscorrespondingpeakflowincrement ,
                 andthefloodinundationareaofthewatershedchangeslittlewiththeincreaseofthereturnperiod.Inor
                 dertomaximizethesocialandeconomicbenefits,itisrecommendedthatthepeakflowunderthereturn
                 periodof500ashouldbeadoptedforthecalculationofaperturesizeofhighwayandrailwaybridgesand
                 culvertsinsmallwatersheds.Theresearchresultscanprovidesomenecessaryreferenceforthemanage
                 mentofextremerainstormsandevaluationoffloodcontrolinsmallwatersheds.
                 Keywords:extremerainstorm;floodcharacteristics;fullhydrodynamicmodel;peakflowgrowthrate;
                 smallwatershedintheLoessPlateau
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