TruckorRailcarLoadoutTruckor有轨车装车

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1、TruckorRailcarLoadoutDependingontheparticularsituation,atransferofmaterialtoatruckorrailcarmaybemodeledasapointsourceoravolumesource(s).Ifasleeve,“spoutsock,”oraugersystemisusedtodeliverthematerialtoadelimitedareawithinthereceivingvolumeandtheentrainmentofmateri

2、alfromwindsacrossthereceivingvolumearenotsignificant,thenconsiderthisapointsourceforparticulateemissions.InaccordancewithDNR’sDispersionModelingGuidelines,theexitvelocityassociatedwiththepointsourceshouldbesetto0.001m/ssincethedischargeisdownwarddirected.Ifthede

3、liveryprocessand/orre-entrainmentarenotwell-controlled,considermodelingthesourceasavolumesource.DNRrecommendsusingthelength,width,andheightofthetrucktrailerorrailcartodetermineparameters.Thelength/widthratio(roundedtonearestinteger)determinesthenumberofvolumesou

4、rces.Theusualapproachwouldbetosetthereleaseheightat½thestructureheight,correspondingtothemiddleofthevolume.Thismaybeacceptableforinternalemissionsbeingreleasedfromabuilding;howeveramoreappropriateapproachforloadingoperationsmaybetoassumethe1releaseheightisatthet

5、opofthetrucktrailerorrailcar.Releaseheight=h=heightoftrucktrailerorrailcarTreatthesourceasanelevatedvolumesource(he>0=h)andasifitwereonoradjacenttoabuilding—thebuildingbeingthetrailerorrailcar.Therefore,σz=h/2.15Ifthelength-to-widthratioofthetrailerorrailcar(rou

6、ndedtothenearestinteger)is1,thentheinitiallateralplumespreadis:σy=w/4.3wherewistheside-to-sidewidthofthetrailerorrailcarIfthelength-to-widthratiois2orgreaterandthesourceisrepresentedbyseparatedvolumes(thisisusuallythewayitisrepresented),thenσy=d/2.15,wheredisthe

7、center-to-centerdistancebetweenthevolumesIfthelength-to-widthratiois2orgreaterandthesourceisrepresentedbyadjacent(continuous)volumes,then2σy=w/2.15.1Insomecases,loadoutoperationsmaytakeplacewithinabuilding.Itmaythenbeappropriatetotreattheentirebuildingasatypical

8、volumesourcewithabuildingenclosurecreditfactorapplied.2Theseproceduresareconsistentwiththedescriptionsofmodelingvolumesourcesfoundintheuser’smanualforAERMOD.Version3-