Page 45 - 水利学报2025年第56卷第3期
P. 45

Effectoftherevisionoftechnicalstandardfordeterminationofsediment
                                 particlesizeontheestimationofparticlesizedistribution

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                                                   1
                                                                                 2
                                       YANGRunyi,ZHANGHongwu,ZHUJinfeng
                                 (1.StateKeyLaboratoryofHydroscienceandEngineering,Beijing 100084,China;
                                2.DepartmentofHydrologyoftheMinistryofWaterResources,Beijing 100053,China)
                  Abstract:Theprinciplesandmethodsfordeterminingsuspendedsedimentparticlesizeintechnicalstandardshave
                  undergonerevisionseveraltimes.Studyingtheimpactoftheserevisionsontheconsistencyofparticlesizedistribu
                  tiondataenhancesourunderstandingofthereliabilityofthehydrologicaldataandenrichesthetheoryofriverdy
                  namics.Inordertoinvestigatetheeffectsofthesetechnicalstandardrevisionsontheoriginalhydrologicaldata,
                  thispapercomparesthecalculationresultsoftheoldandnewsettlingvelocityformulas,highlightingasignificant
                  differencebetweentheparticlesizesobtainedbytheShaYuqing ’sformulaandGoncharov’searlyformula.Utili
                  zinghydrologicaldatafromsevenstationsinthelowerYellowRiverfrom1960to1985 ,thestudyre - evaluatesthe
                  particlesizedistribution,characteristicgrainsize,andaveragesettlingvelocityintheoriginaldataaccordingtothe
                  particlesizedeterminationmethodpreviouslyandcurrentlyadoptedbythetechnicalstandard.Thedegreeofinflu
                  enceofthestandardchangeondataconsistencywasassessed,revealingthatdifferentsettlingvelocityformulasaf
                  fecttheconsistencyofhydrologicaldata,hamperingfinestudyofsedimentmovementlaws,particularlythewater
                  carryingcapacity.Inordertoaddressissuesarisingfromtechnicalstandardrevisions,thestudyproposesapolyno
                  mialregression - basedmethodforparticlesizedistributionconversion,whichdemonstrateshighfittingaccuracy.In
                  thelastpartofthispaper,thedifferencesinthecalculationresultsoftheGoncharov’searlyformulaandtheSha
                  Yuqing’sformulawithtemperaturevariationsarestudiedandcomparedwiththosederivedfromZhangRuijin’sfor
                  mula.Theresultsfoundthatthechangeofviscouscoefficientcausedbyvariationsintemperaturehasthemostpro
                  nouncedeffectonthesedimentsettlingvelocitycalculatedbyZhangRuijin ’sformula,whichisinlinewiththe
                  basicconceptofsedimentsettlingthebest.
                  Keywords:determinationofsedimentparticlesize;technicalstandardrevision;theYellowRiver;particlesize
                  distribution;settlingvelocityformula
                                                                            (责任编辑:鲁 婧 韩 昆)


              (上接第 316页)
                          AmethodcoupledGaussian - ExtremedistributionwithCloudmodelsfor
                                      riskanalysisoffloodcontroloperationalscheme

                                   KANGLing,LIAOWufeng,ZHOULiwei,WENYunliang
                      (SchoolofCivilandHydraulicEngineering,HuazhongUniversityofScienceandTechnology,Wuhan 430074,China)


                  Abstract:Theflooddisasterseriouslythreatensthesafetyoflifeandpropertyandtherapidandstabledevelop
                  ment.Itisnecessarytoacceleratetheconstructionofanintelligentwaterconservancysystemwiththefunctionsof
                  “forecast,earlywarning,rehearsalandpre - plan”.Thispaperfocusesontheriskanalysisoffloodcontrol
                  schedulingplan(FCSP)intheintelligentwaterconservancysystem.AsetofFCSPriskanalysisindexsystemsis
                  constructed,integratingreservoirs,leveesandfloodstorageareas.Targetingfloodriskdistributionsthatdonot
                  fullyconformtoaGaussiandistribution ,ariskanalysismethodforFCSPsbasedonGaussian - Extremevaluedis
                  tributionandcloudmodelsisproposed.TheriskleveloftheFCSPispresentedinanintuitivemanner,andasys
                  tematictransformationofthequalitativeandquantitativeriskoftheFCSPisachieved.Takingthefivenumbered
                  floodsintheYangtzeRiverbasinin2020ascasesforanalysis ,theresultsindicatethattheriskanalysisresultsof
                  themethodinthispaperareclosertorealityandmorereasonablethantheGaussiandistributionmethod ,andthe
                  riskvaluesandriskratingsofthecorrespondingfloodpreventionanddispatchingplansunderthefivenumbered
                  floodsare0.18(Class Ⅳ),0.30(Class Ⅲ),0.37(Class Ⅲ),0.19(Class Ⅳ),and0.40(Class Ⅲ),re
                  spectively.Thesefindingssuggestthatthelower - riskplanswereadoptedforfloodpreventionanddispatching ,
                  therebyensuringthesafetyoftheYangtzeRiverBasin.Furthermore,themethodinthispaperenablesreal - time
                  evaluationandcomparativeanalysisoftheplans ,whichallowsforasystematicanalysisoftherisksituationofthe
                  plansandprovidesscientificsupportfortheriskanalysisofFCSPs.
                  Keywords:intelligentwaterconservancy;floodcontrolschedulingplan;floodriskanalysis;indicatorsystem;
                  Gaussian - Extremedistribution;Cloudmodel
                                                                                    (责任编辑:耿庆斋)

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