Page 85 - 《水资源与水工程学报》2023年第2期
P. 85

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

            DOI:10.11705/j.issn.1672-643X.2023.02.10


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                      Explorationofecologicalwaterdemandthresholdsforriversin
                                    GansusectionoftheYellowRiverBasin

                                                                                         1
                                                                         3
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                                           1
                                WANGZiyu,QIAOXiaoying ,ANYuting,FENGZechao
                  (1.SchoolofWaterandEnvironment,Chang’anUniversity,Xi’an710054,China;2.KeyLaboratoryofUnderground
                          HydrologyandEcologicalEffectsinAridAreas ,MinistryofEducation,Xi’an710054,China;
                                3.Xi’anYellowRiverPlanningandDesignCo.,Ltd.,Xi’an710021,China)
                 Abstract:Thestudyofecologicalwaterdemandthresholdsisimportantforimprovingthediversity,sta
                 bility,andsustainabilityofriverecosystemsandthemanagementofriverecologicalwaterdemand.Inre
                 sponsetowaterandecologicalenvironmentalproblemssuchasrivercutoff ,severewaterpollution,and
                 highsedimentcontentintheGansusectionoftheYellowRiverBasin,theecologicalbaseflowiscalculat
                 edusingannualdistributionmethodbasedonthemonthlyrunoffdatafrom30hydrologicalstationsfrom
                1956to2016,andthenintegratedwiththewaterdemandofselfpurificationandthesedimenttransportto
                 formthebasicecologicalflowaccordingtotheprincipleof“takingthebigone”.Meanwhile,thetarget
                 ecologicalflowisdeterminedbythemonthbymonthfrequencycalculationmethod.Finally,thedistribu
                 tioncharacteristicsofthebasicecologicalflowandtargetecologicalflowareintegratedtoobtaintheannu
                 alecologicalwaterdemandthresholdsfortherivers,whicharethengradedandevaluatedtoascertainthe
                 degreeofsatisfaction.Theresultsshowthattheecologicalwaterdemandthresholdsofthemainstreamof
                                                                                         3
                 theYellowRiverduringthedryandwetperiodsoftheyearare74.78-393.29m /sand595.35-
                            3
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                1 ,108.84m /s;thetributariesinthesectionfrom MaqutoShangquanare8.97-26.81m /sand
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