Page 102 - 《水资源与水工程学报》2024年第6期
P. 102
!35 "!6 # & ' ( ) & * + , - Vol.35No.6
2024 $ 12 % JournalofWaterResources&WaterEngineering Dec.,2024
DOI:10.11705/j.issn.1672-643X.2024.06.10
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3IJKL:TV135.2;TV653 MNOPQ:A MRSL:1672643X(2024)06009812
Effectofweirshapesonthedischargenoisecharacteristicsoflandscapedams
HONGKai,WANGYu
(CollegeofHydraulicandEnvironmentalEngineering,ChinaThreeGorgesUniversity,Yichang443002,China)
Abstract:Landscapedamsplayanimportantroleinurbanriverfloodcontrolanddrainage,aswellasur
banwaterlandscapeconstruction.However ,continuousflownoiseisoftengeneratedwhenthedamdischar
ges,whichcausespollutiontotheacousticenvironmentinthenearshoreareaoftheriver.Weirstructure,
asanintegralpartofthedam,inevitablyaffectsthedischargenoiseandpropagationcharacteristics;toclar
ifyitsinfluence ,differentweirtypeswerestudiedbyfieldmonitoringandnumericalsimulation.Theresults
showthatthedifferenceofflowvelocity,turbulencedegreeandvorticitycausedbydifferencesinweirtypess
hasagreatimpactonthesoundsourcecharacteristicsofdischargenoise.Largeoverflowsurfaceslopeand
weirheight,aswellassmallthicknessofweirbodyoftenleadtodischargenoisewithlargesoundpressure
level ;however,thepressurelevelcanbeeffectivelyreducedbythestillingbasinstructurebehindtheweir.
Thedissipationnoiseenergyofoverflowsurfacestructurewithflipbuckethasafastattenuationspeedalong
thecourse ,andhaslittleinfluenceontheacousticenvironment.Incomparison,thelowfrequencyenergy
ofthedischargenoiseoftheweirwithlargeslopeandsmallbottomwidthisrelativelystrong,whichhasa
greaterimpactonhumanhealth.Theresearchresultscanprovideatechnicalsupportforthenoisereduction
ofurbanlandscapedams.
Keywords:landscapedam;bodytypestructure;dischargenoise;noisepropagation;numericalsimulation
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