Page 125 - 《水资源与水工程学报》2023年第2期
P. 125

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

            DOI:10.11705/j.issn.1672-643X.2023.02.15


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                 GHIJK:TV863;TV122 .4   LMNOP:A    LQRK:1672643X(2023)02012107
                      HydraulicandalluvialcharacteristicsofthelowerYellowRiver
                             afterthesuddendambreakofpermeablespurdikes

                                                               1
                                                                               1
                                                     2
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                                       1
                          PENGXiuzhu,ZHAOYing,GAOLu,XUXiangzhou,XIAJunqiang
                (1.SchoolofHydraulicEngineering,DalianUniversityofTechnology,Dalian116024,China;2.WaterResourcesResearch
                        InstituteofShandongProvince ,Jinan250013,China;3.StateKeyLaboratoryofWaterResourcesand
                                 HydropowerEngineeringScience,WuhanUniversity,Wuhan430072,China)
                 Abstract:Dambreakisatypeofcatastrophicprocesswithinstantaneousandhugedestructiveeffects,
                 whichcancausesuddenscouringandsiltingoftheriverbedandeveninstabilityandcollapseoftheriver
                 bankinthedownstream oftheriver.Inthisstudy ,atwodimensionalnumericalmodelbasedonthe
                 shapeofthenaturalchannelandtheactuallayoutoftheexistingspurdikegroupwasconstructedusing
                 theMIKE21FM software.Themainobjectivesofthisstudyaretosimulatethedownstream waterand
                 sedimenttransportprocessafterthesuddenfailureofthefirstpermeablespurdike ,andthentoanalyze
                 thechangesinriverbedshearstressandthealluvialcharacteristicsoftheriverbednearthespurdikes.
                 Theresultsshowthataftertheinstantaneousfailureofthefirstspurdike ,thefloodevolutionisinfluenced
                 bythedownstreamspurdikesandchangesitsprocess.However,thedambreakhaslittleeffectonthe
                 sedimenttransportcapacityofthemainchannel,butsignificantlyaffectstheincipientandsettlingmotions
                 ofsedimentintheareabetweenthespurdikes.Furthermore ,sincethebodyofthefirstspurdikeandthe
                 headofthesecondspurdikearethemostvulnerableareas ,acompositeconfigurationstructureofperme
                 ableandimpermeabledikesisrecommendedforthespurdikegrouplayouttoimproveitsstabilityduring
                 operation ,whichisimpermeabledikesforthefirstandsecondspurdikesandpermeabledikesfortherest
                 ofthedikegroup.
                 Keywords:permeablespurdikes;dambreakflow;processofflowsediment;riverbederosion;numeri
                 calsimulation ;thelowerreachesoftheYellowRiver
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