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Wind- and Traffic produced Turbulence

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

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  1. Wind- and Traffic produced Turbulence NORTRIP – Arlanda meeting 16. Nov.2010 Matthias Ketzel

  2. 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

  3. 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

  4. Field observations (NOx) C/Q = f(wind speed; traffic volume) evidence for influence of traffic produced turbulence

  5. Wind tunnel studies on TPT By: Petra KLEIN Wind tunnel Karlsruhe

  6. Keep in mind: Variability in field data • averaging times • stationarity • fluctuation in meteorology • fluctuation in emissions

  7. Wind induced turbulence • effect on emission factors • Stockholm flux measurements (TV tower) • US Road Dust Emission Review

  8. effect on emission factors

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