caa a22 4500 445874562 CHVBK 20180317145523.0 cr unu---uuuuu 170323e20111201xx s 000 0 eng 10.1007/s10652-011-9215-2 doi (NATIONALLICENCE)springer-10.1007/s10652-011-9215-2 A dispersion model for traffic produced turbulence in a two-way traffic scenario [Elektronische Daten] [Meilu He, Suresh Dhaniyala] Low wind speed conditions are often associated with poor air quality in urban areas, especially near roadways. Predictions of pollutant concentration under such conditions, i.e. low wind-speeds and near road locations, are, however, complicated by the role of traffic produced turbulence (TPT) on pollutant mixing and dilution. Existing dispersion models consider the effect of TPT on pollutant concentrations near roadways, accounting for parameters such as vehicle intensity, vehicle speeds, etc, but do not explicitly account for the contribution of two-way traffic interaction on the pollutant dispersion parameter. The turbulent kinetic energy (TKE) resulting from a two-way traffic condition will be higher than that with a one-way traffic pattern. Here, we obtain a simple formulation for TKE under a two-way traffic pattern from the balance of production and dissipation of turbulence. Considering the vorticity generated by the two-way traffic and determining the equivalent drag coefficient, an expression for TKE due to the two-way traffic interaction was obtained for three different traffic density regimes: light, intermediate, and heavy. The model predictions are validated by comparison with published data from a field study. An improved parameterization of the TPT considering the two-way traffic interaction effect is seen to significantly improve predictions of near roadway pollutant concentrations. Springer Science+Business Media B.V., 2011 Two-way traffic nationallicence Traffic produced turbulence nationallicence Turbulent kinetic energy nationallicence Roadway nationallicence Dispersion nationallicence Pollutant nationallicence CALINE4 : CAlifornia LINE source dispersion model version 4 nationallicence CFD : Computational fluid dynamics nationallicence CPBM : Canyon plume box model nationallicence GM : General Motors nationallicence HDV : Heavy duty vehicle nationallicence LDV : Light duty vehicle nationallicence OSPM : Operational street pollution model nationallicence QUIC : Quick urban and industrial complex dispersion model nationallicence TKE : Turbulent kinetic energy nationallicence TPT : Traffic produced turbulence nationallicence He Meilu Department of Mechanical and Aeronautical Engineering, Clarkson University, 13699, Potsdam, NY, USA aut Dhaniyala Suresh Department of Mechanical and Aeronautical Engineering, Clarkson University, 13699, Potsdam, NY, USA aut Environmental Fluid Mechanics Springer Netherlands 11/6(2011-12-01), 627-640 1567-7419 11:6<627 2011 11 10652 https://doi.org/10.1007/s10652-011-9215-2 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10652-011-9215-2 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- He Meilu Department of Mechanical and Aeronautical Engineering, Clarkson University, 13699, Potsdam, NY, USA aut NATIONALLICENCE 700 1- Dhaniyala Suresh Department of Mechanical and Aeronautical Engineering, Clarkson University, 13699, Potsdam, NY, USA aut NATIONALLICENCE 773 0- Environmental Fluid Mechanics Springer Netherlands 11/6(2011-12-01), 627-640 1567-7419 11:6<627 2011 11 10652 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer