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Wind- and Traffic produced Turbulence. NORTRIP – Arlanda meeting 16. Nov.2010 Matthias Ketzel. Combined action of wind- and traffic produced turbulence(TPT). effect on dispersion of traffic emissions higher dispersion ( lower conc .) with higher turbulence
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Wind- and Traffic produced Turbulence NORTRIP – Arlanda meeting 16. Nov.2010 Matthias Ketzel
Combined action of wind- and traffic produced turbulence(TPT) • effect on dispersion of traffic emissions • higher dispersion (lower conc.) with higher turbulence • best investigated for gases (NOx, CO) • expected to act in similar way on PM • effect on emissions • higher emission factors for higher vehicle speed
Christer: Would be interesting to do an experiment with a car running over colored sand to “see” relative importance of tyre and vehicle body for suspension
Field observations (NOx) C/Q = f(wind speed; traffic volume) evidence for influence of traffic produced turbulence
Wind tunnel studies on TPT By: Petra KLEIN Wind tunnel Karlsruhe
Keep in mind: Variability in field data • averaging times • stationarity • fluctuation in meteorology • fluctuation in emissions
Wind induced turbulence • effect on emission factors • Stockholm flux measurements (TV tower) • US Road Dust Emission Review