简介：Particlesbehaviourwasmonitoredandanalyzedinastormwaterwetlandoveraperiodof4months(June-September,2009).Theresultsindicatedthattheparticlesbehaviourcanbeaffectedbymanyprocesses,suchassedimentation,resuspension,adsorptionandreleaseinstormwaterwetlandsduringdrydays.Duetotheeffectsofthesefactors,theparticlesremovalefficiencycalculatedbasedonthesettlingtheorywassignificantlyhigherthanthevalueobtainedusingthemeasuredparticlesnumberconcentration.Andthemeasuredefficiencyshowedaturningpointintherangeof2-4μm,whichwaswithinthecolloidalparticlesrange.Analysisofparticlesizedistributionshowedthatparticleswerefinerintheoutflowthaninflowduetosedimentationofthecoarseparticlesandresuspensionofthefineparticlesinthewetland.Particlesindifferentsizerangesplaydifferentrolesintheircontributiontoturbidityandtotalsuspendedsolidsconcentration.Thefinerparticles(lessthan10μm)showedacloserrelationshipwiththeturbiditywhilecoarserparticles(>4μm)weremorerelatedtototalsuspendedsolidconcentration.