Experimental Verification of Plate’s Criteria for Urban Roadways Intersection
نویسنده
چکیده
In recent past, significant efforts have been made to improve the scientific understanding of exhaust dispersion phenomenon in urban street canyons/intersection. The amount of turbulence generated by natural winds within the street canyon might be smaller than that of traffic induced turbulence. Therefore, the influence of traffic-induced turbulence on exhaust dispersion has to be quantified. In the present study, Plate’s energy based criterion for physical modelling of traffic-induced turbulence has been verified for urban intersection under heterogeneous traffic conditions, using environmental wind tunnel. The experimental results revealed that the effect of traffic-induced turbulence in concentration reduction increases with increase in traffic volume. The trends of reduction in tracer gas concentration with variable traffic volume and velocity ratio for all sampling locations have been found to be similar. This strongly supports the idea proposed by Plate (1982) for wind tunnel simulation studies.
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