HIGHWAY-ROADWAY. EPA/ORD (Environmental Protection Agency/Office of Research and Development) air-quality simulation model. Model-Simulation
ROADWAY is a finite-difference model which solves a conservation of species equation to predict pollutant concentrations within two hundred meters of a highway. It uses surface-layer similarity theory to predict wind and eddy diffusion profiles from temperature at two heights and wind velocity upwind of the highway. A unique feature of the model is its use of vehicle wake theory. It is assumed that vehicle wakes affect the wind and turbulance fields in a linear manner with wake intensity a function of vehicle speed, downwind distance, and distance from the wake center. HIWAY is a model which computes the hourly concentrations of non-reactive pollutants downwind of roadways. It is applicable for uniform wind conditions and level terrain. Although best suited for at-grade highways, it can also be applied to depressed highways.
- Research Organization:
- Environmental Protection Agency, Research Triangle Park, NC (USA). Environmental Sciences Research Lab.
- OSTI ID:
- 7070133
- Report Number(s):
- PB-90-500810/XAB
- Country of Publication:
- United States
- Language:
- English
Similar Records
ANL/HIWAY: an air pollution evaluation model for roadways
Modeling carbon monoxide dispersion from roadways
Related Subjects
540120* -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (1990-)
AIR POLLUTION
AIR QUALITY
CHEMICAL REACTIONS
COMPUTERIZED SIMULATION
DIFFUSION
DISTANCE
ENVIRONMENTAL QUALITY
FINITE DIFFERENCE METHOD
FLUID FLOW
FORECASTING
FORTRAN
ITERATIVE METHODS
MATHEMATICAL MODELS
NUMERICAL SOLUTION
POLLUTION
PROGRAMMING LANGUAGES
ROADS
SIMULATION
TURBULENT FLOW
VEHICLES
VELOCITY