Page 118 - 《水资源与水工程学报》2024年第5期
P. 118

!35 "!5 #                         & ' ( ) & * + , -                               Vol.35No.5
               2024 $ 10 %              JournalofWaterResources&WaterEngineering                 Oct.,2024

            DOI:10.11705/j.issn.1672-643X.2024.05.14


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                       Influenceofendsillslopeonflowfieldsinstillingbasinsunder
                                          lowFroudenumberconditions


                                      GOUWenjuan,SHENZhengzhong,LIHuiping
             (StateKeyLaboratoryofHydraulicEngineeringIntelligentConstructionandOperation,TianjinUniversity,Tianjin300350,China)
                 Abstract:LowFroudenumberhydraulicjumpsalwaysoccurundertheconditionsoflargedischargewith
                 lowhydraulichead,causingtheriskofscourdamagetothedownstreamriverbedandslopes.Thispaper
                 addressesthecharacterizationoflowFroudenumberjumpsoncasesofdifferentslopesofendsillinahy
                 draulicprojectusingnumericalanalysis.TheresultsshowthatunderlowFroudenumberinflow ,sub
                 mergedtransitionflowisformedinthestillingbasin ,andtheflowfieldofthesubmergedtransitionjump
                 isdividedintocorezone ,developingzone,andbackflowzoneinthehorizontaldirection.Thecorezone
                 isthendividedintojetinnerlayer,jetouterlayer,rollerinnerlayer,androllerouterlayerinthevertical
                 directionbasedonthevelocitycharacteristics.Thetimemeanpressureincreasesandthebottomvelocity
                 decreasesalongthecourseinalltypesofstillingbasins.Thesteepeningoftheendsillslopecausesthe
                 startingplaneoftherollertomoveupstreamandendingplanetomovedownstream,resultinginalonger
                 roller.Thegradientoftheunderflowvelocityintheendsillslopesectionis0whenthesloperatiois1∶
                3 ,itisnegativewhenthesloperatioislessthan1∶3andpositivewhenthesloperatioisgreaterthan1∶
                3.Thisisbecausethesteeperslopereducestheresistanceoftheendsilltothewaterinthedirectionpar
                 alleltotheslope ,resultinginagradualincreaseinvelocitygradient.Thesefindingscanprovidearefer
                 enceforthedesignofstillingbasinsinsimilarprojects.
                 Keywords:stillingbasin;lowFroudenumberhydraulicjump;slopeofendsill;flowfieldstructure;

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