Page 43 - 《水资源与水工程学报》2022年第3期
P. 43
!33 " ! 3 # & ' ( ) & * + , - Vol.33No.3
2022 $ 6 % JournalofWaterResources&WaterEngineering Jun.,2022
DOI:10.11705/j.issn.1672-643X.2022.03.06
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8IBJK:TV697.3;X524 LMNOP:A LQRK:1672643X(2022)03003911
Verticaldistributionandinfluencingfactorsofdissolvedoxygenduring
thermalstratificationinPanjiakouReservoir
1,2,3
1,2,3
GAORui ,HUANGSuiliang ,SUNYixuan 1,2,3
(1.KeyLaboratoryofPollutionProcessesandEnvironmentalCriteriaoftheMinistryofEducation,NankaiUniversity,
Tianjin300071,China;2.TianjinKeyLaboratoryofRemediationandPollutionControlforUrbanEcological
Environment,NankaiUniversity,Tianjin300071,China;3.NumericalSimulationGroupforWaterEnvironment,
CollegeofEnvironmentalScienceandEngineering,NankaiUniversity,Tianjin300071,China)
Abstract:Inordertoexploretheeffectofreservoirthermalstratificationontheverticaldistributionofdis
solvedoxygen (DO),amonitoringplatformwassetupinPanjiakouReservoirinAugust2019.Formonito
ringpurposes ,YSI-EXO2monitorandNISKINsamplerwereusedtocollectwatersamplesandtomeasure
theverticaldistributionofwaterqualityindicatorssuchaswatertemperature,dissolvedoxygen,pH and
phytoplanktoninthereservoir.Then ,theinfluencingfactorsofthedistributionofdissolvedoxygenandthe
formationcausesresponsibleforthemetalimneticoxygenminimum(MOM)duringthethermalstratification
periodwereanalyzedbasedonthemeasurements.TheresultsshowedthatPanjiakouReservoirhasunderg
onesignificantthermalstratificationinAugust,2019andthewatertemperaturepresentedepilimnion-met
alimnion-hypolimnionstructure.Theconcentrationofdissolvedoxygenintheepilimnionwashigherthan
6.5mg/L ,whereasinthemetalimnionitwasreducedsignificantlywithalargegradient,whereMOM ap
pearedbecauseofthethermalstratification.Theconcentrationofdissolvedoxygeninthehypolimniongrad
uallyrecoveredpartly.Correlationanalysisindicatedthatdissolvedoxygenwassignificantlycorrelatedwith
watertemperatureandbuoyancyfrequency,andthethermalstratificationwasthemainphysicalfactorfor
theformationofMOM.DissolvedoxygenwaspositivelycorrelatedwithphytoplanktonbiomassandpH ,
whichwasmainlyassociatedwithphotosynthesisandrespirationofphytoplankton.ThedevelopmentofMOM
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