Page 141 - 《水资源与水工程学报》2022年第6期
P. 141
! 33 " ! 6 # & ' ( ) & * + , - Vol.33No.6
2022 $ 12 % JournalofWaterResources&WaterEngineering Dec.,2022
DOI:10.11705/j.issn.1672-643X.2022.06.17
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KLDMN:TU985.12 OPQRS:A OTUN:1672643X(2022)06013708
Hydraulicconductivityattenuationprocessofraingarden
anditscontrolmeasures
1
1
1
1,2
1
1,2
DANGZhenguo,JIANGChunbo ,LIHuaien ,TANGHaichuan,RAOMaozhi,SONGKaige
(1.SchoolofWaterResourcesandHydroelectricEngineering,Xi’anUniversityofTechnology,Xi’an710048,China;2.StateKey
LaboratoryofEcohydraulicsinNorthwestAridRegionofChina,Xi’anUniversityofTechnology,Xi’an710048,China)
Abstract:Theraingardeninfiltratesandpurifiesrainfallrunoffthroughthecomprehensiveeffectof
“plant-soil-microorganism”;however,thecloggingoffillersleadstothedecreaseofitshydrauliccon
ductivitywiththeextensionofoperationtime,resultingintheattenuationoftheraingardenoperation
life.Takingtheraingardenofinfiltrationtypewhichhasbeenoperatingfortenyearsanditssurrounding
conventionalgreenspaceinXi ’anUniversityofTechnologyastheresearchobjects,westudiedtheinflu
encingfactorsofthehydraulicconductivityattenuationoftheraingardenbycomparingthetotalpollution
loadofthesetwofacilities,theinfiltrationrateofthefillersandtheparticlesizedistributionofdifferent
layers.TheresultsshowedthatthemainpollutantsintheraingardenareSS,TN,TPandCOD,andthe
2
totalinflowloadsareabout544.51,21.55,1.65and514.50g/m,whichare7-34timesofthosein
theconventionalgreenspace.Atpresent ,thesteadyinfiltrationrateoftheconventionalgreenspaceis
nearly10timesofthatoftheraingarden.Fromthetemporalperspective,thesteadyinfiltrationrateof
theraingardenafter10yearsofoperationis23.24mm/h,whichis5.2timeslowerthanthatintheini
tialstageofestablishment.Comparedwiththeconventionalgreenspaceonverticalspatialscale ,thecon
tentofclayandpowderparticlesintheraingardenfillerswiththeburieddepthof0-50cmarerelatively
high ;whereastheparticlesizedistributionofthetwofacilitiesburieddeeperthan50cmarebasicallythe
same,indicatingthatthephenomenonofcloggingmainlyoccurredinthefillerswiththeburieddepthof
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