Page 134 - 《水资源与水工程学报》2024年第2期
P. 134
!35 "!2 # & ' ( ) & * + , - Vol.35No.2
2024 $ 4 % JournalofWaterResources&WaterEngineering Apr.,2024
DOI:10.11705/j.issn.1672-643X.2024.02.15
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GHIJK:TV672 .2;X52 LMNOP:A LQRK:1672643X(2024)02013009
Influenceoflocalcoolingonbloom suppressioninwaterdiversionchannels
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ZHANGYazhuo,SONGZhixuan,YAOYe ,YANLinlin,XUChuhan 1
(1.StateKeyLaboratoryofHydraulicEngineeringIntelligentConstructionandOperation,TianjinUniversity,Tianjin300350,China;
2.InstituteofMarineEnergyandIntelligentConstruction,TianjinUniversityofTechnology,Tianjin300384,China)
Abstract:ThemiddlerouteofSouthtoNorthWaterDiversionProjecthasbeenthemainsourceofwater
supplyforBeijingandTianjinsinceitsopeningtotheoutsideworld,bringingmassivesocialandeconom
icbenefitstothesociety.Atpresent ,thephysicalandchemicalindicesofwaterqualityarerelativelysta
bleinthemiddlerouteproject,withoccasionalabnormalalgalproliferationinsomechannelsections,
whichmayleadtoalgalbloomsifleftunattended.Toaddressthisproblem,theengineeringmeasureof
localcoolingventilation ,whichchangedthelocalmeteorologicalconditionswasadopted,andatwodi
mensionalhydrodynamicandwaterqualitymodelwasdevelopedforthePenghe-Shaheaqueduct ,and
theeffectsofdifferentventilationlocations ,ventilationtemperatureandventilationdurationonwatertem
peratureandalgaegrowthinwaterdiversionchannelswerestudied.Theresultsshowthatbothwatertem
peratureandchlorophyll aconcentrationarerelatedtoventilationposition,ventilationtemperatureand
ventilationduration.Thelowertheventilationtemperature ,thelongertheventilationduration,thegrea
terthedeclineofthewatertemperatureandchlorophyllaconcentration,thewatertemperaturecanbere
ducedbyabout2℃,andtheconcentrationofchlorophyllacanbereducedbyabout54.5% atmost,
bothupstreamonlyventilationandwholechannelsectionventilationcanlowerthewatertemperatureand
inhibitthegrowthofalgae ,butdownstreamonlyventilationhaslittleeffectonwatertemperatureandal
gaegrowth.Therefore ,localcoolingcanreducetheconcentrationofchlorophyllatosomeextent,consid
eringthealgalinhibitioneffectandengineeringcost ,theengineeringmeasureoflocalcoolingventilation
intheupstreamisrecommendedforthealgalbloompronechannelsections.
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