Wind tunnel modelling of vehicle emissions on roadways as line sources

Conference · Thu Dec 31 23:00:00 EST 1987

OSTI ID:7035954

Murphy, M C; Davies, A E ^[1]

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1. Rowan Williams Davies and Irwin Inc., Guelph, Ontario, (CA)

The prediction of air quality impacts from heavily travelled roadways in urban areas is difficult because of effects related to flow in complex urban terrain. Computer models have been developed such as HI-WAY2 (a USEPA UNAMAP) model to predict dispersion from vehicle exhausts and these work well for simple terrains (open and canyon). As terrain becomes more complex, the accuracy of the computer model decreases. The only recourse (other than full scale measurements) is to use physical modelling. Using this approach, a detailed scale model of the urban site is constructed and placed in a boundary layer wind tunnel for dispersion analysis. Vehicular traffic on the site is best represented by a continuous line source simulator which is built onto the model. During testing, the dispersion of vehicle exhaust is simulated by imposing properly scaled meteorological conditions (wind speed and direction) on the model. The impact of the source is then evaluated from concentrations measured at strategically placed receptors. The effect of the varying terrain on dispersion from the line source is taken into account.

• OSTI ID: 7035954
• Report Number(s): CONF-880679--
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330700* -- Advanced Propulsion Systems-- Emission Control
54 ENVIRONMENTAL SCIENCES
540120 -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (1990-)
99 GENERAL AND MISCELLANEOUS
990200 -- Mathematics & Computers
AIR POLLUTION CONTROL
AIR QUALITY
COMPUTER CODES
COMPUTERIZED SIMULATION
CONTROL
DISPERSIONS
ENVIRONMENTAL IMPACTS
ENVIRONMENTAL QUALITY
EXHAUST GASES
FLUIDS
GASEOUS WASTES
GASES
H CODES
POLLUTION CONTROL
POLLUTION SOURCES
SCALE MODELS
SIMULATION
STRUCTURAL MODELS
TUNNELS
UNDERGROUND FACILITIES
URBAN AREAS
VEHICLES
WASTES
WIND TUNNELS