Page 104 - 《水资源与水工程学报》2023年第1期
P. 104
!34 " ! 1 # & ' ( ) & * + , - Vol.34No.1
2023 $ 2 % JournalofWaterResources&WaterEngineering Feb.,2023
DOI:10.11705/j.issn.1672-643X.2023.01.12
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FGHIJ:TV213.4;X143 KLMNO:A KPQJ:1672643X(2023)01010010
EcologicalbaseflowdeterminationandearlywarningschemeoftheDatongRiver
3
2
1
1
1
1
ZHANGWenrui,SUNDongyuan,CAOXiaoxuan,YANGJun,ZHOUMin,ZHAOWenqi
(1.CollegeofWaterConservancyandHydropowerEngineering,GansuAgriculturalUniversity,Lanzhou730070,China;
2.HenanHydrologyandWaterResourcesBureauoftheYellowRiverConservancyCommission,Zhengzhou450003,China;
3.SoilandWaterConservationCenterofGansuProvincialWaterResourcesDepartment,Lanzhou730000,China)
Abstract:Safeguardingtheecologicalbaseflowisthebasicrequirementofmaintainingtheecological
healthandfunctionsofrivers.BasedonthelongseriesrunoffdataofQingshizui ,Tiantang,Liancheng
andXiangtangstationsintheDatongRiverBasin ,thebaseflowproportionmethod,Tennantmethod,the
multiyearaverageofthedriestmonthlyaverageflowmethod ,90thpercentilemethodand7Q10method
werecombinedtocalculatetheecologicalbaseflowoftheDatongRiverBasin.Meanwhile ,theearly
warningschemeandflowcontrolindicatorswereinvestigatedaccordingly.Theresultsshowthatthecalcu
lationresultsofbaseflowproportionmethodismorecomprehensiveandreasonable ,andcanreflectthe
ecologicalbaseflowofthebasinineachinterannualperiod.Accordingtothecalculation ,therangeof
ecologicalbaseflowintheDatongRiverBasinisdeterminedtobe11% -35% oftheannualaverage
flow ,andtheecologicalbaseflowofQingshizui,Tiantang,LianchengandXiangtangstationsis5.57-
3
17.73,8.68-27.61,9.08-28.88and9.39-29.89m /s,respectively.Furthermore,theassurance
degreeofannualbaseflowobtainedfromtheguaranteedegreeanalysisreaches90%.Then ,accordingto
thedeterminedecologicalbaseflow ,theecologicalearlywarningiscategorizedintothreelevelsofblue
warning ,orangewarningandredwarning,basedonwhichtheearlywarningschemeisformulatedtoim
provethereliabilityandaccuracyofflowmonitoringandoptimizereservoirschedulinginthemeantime.
Keywords:ecologicalbaseflow;earlywarningscheme;hydrologicalmethod;baseflowproportion
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