Page 133 - 《水资源与水工程学报》2022年第6期
P. 133

! 33 " ! 6 #                      & ' ( ) & * + , -                               Vol.33No.6
               2022 $ 12 %              JournalofWaterResources&WaterEngineering                 Dec.,2022

            DOI:10.11705/j.issn.1672-643X.2022.06.16


                     'º MIKE21 ^â2ãäå3Z„p„DE



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               KLDMN:TV135;TV87   OPQRS:A    OTUN:1672643X(2022)06012908
                             Numericalsimulationofbackwaterofrivercrossing

                                             bridgesbasedonMIKE 21

                                                            2,3
                                                                                      2,3
                                                                         2
                                            1
                                SUNZhiping,ZHAOZhihong ,LIUZijin,WANGXin ,
                                                                   2
                                                     2
                                                                               2,3
                                        LIANHaidong,WANGYan,RENZihao
                   (1.ZhongweiWaterBureau,Zhongwei755100,China;2.SchoolofWaterConservancy,NorthChinaUniversityof
                   WaterResourcesandElectricPower,Zhengzhou450046,China;3.KeyLaboratoryofKeyTechnologyforAllocation
                      andRegulationofRuralWaterResourcesandHydropower,ZhejiangProvince,Hangzhou310018,China)
               Abstract:ToclarifythebackwatercharacteristicsofbridgesintheupperreachesoftheYellowRiverandto
               investigatethereliabilityofthenumericalsimulationmethodsinfloodcontrolcalculations ,sevenconsecutive
               bridgesintheQingtongxia-ShizuishansectionoftheYellowRiver (hereinafterreferredtoasthe“Qing-Shi
               section ”)intheNingxiaHuiAutonomousRegionwereselectedastheresearchobjectstoconstructatwodi
               mensionalhydrodynamicmodelusingtheMIKE21hydrodynamicmodule.Thenthemodelwasappliedtothe
               numericalsimulationandcomparativeanalysisofbackwatercharacteristicsofbridgesunderdifferentfloodfre
               quencies.Theresultsshowthatinthecalibrationandverificationprocess ,therelativeerrorsbetweenthesim
               ulatedandmeasuredvalueswerelessthan5%,theboundaryconstraintsandchannelroughnessshouldbede
               terminedafterthecalibration.Thevelocityoftheriverchanneldecreasedwiththedecreaseofthefloodpeak
               flow ,andthebackwaterofthebridgepiersfluctuatedintherangeof0.10-0.28m.Accordingtothecom
               parativeanalysisofthesimulationresultsofthemodelandthecalculationresultsoftheempiricalformulas ,
               thecalculatedresultsoftheHendersonformulawereingoodagreementwiththesimulationresultswhichpres
               entedconsistentchangetrends ;whereasthoseofLuHao’sformulaoverestimatedthesituation.Thisstudy
               canprovideanempiricalreferenceandtheoreticalbasisfortheinfluenceanalysisofbackwatercharacteristics
               ofrivercrossingbuildingsandthefloodcontrolcalculationsofriverchannels.

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