Essay On Roadside Barriers

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Recommended: Air pollutions from transportation

Roadside barrier are commonly used as a tool to reduce the pollution dispersion which exist in residential area which are nearby to industrial or highway. In this study, 2 dimensional computational fluid dynamic has been conducted to simulate the roadside barrier impact on near road air pollution. Different height of the barrier and the velocity input will be evaluate

Keywords:
Air pollution, Barrier, CFD modeling

1.0 Introduction
In recent year, air pollution has been rapidly increasing caused mainly by industrial growth and increasing the use of vehicles in most developing countries. This might be risk for a variety of health problem. Thus, roadside barriers can be as a concept to reduce the near-road pollution and a tool to improve the air quality. Experiments show that a roadside barrier leads to decrease the concentration of roadway emission in the wake of a barrier, relative to a non-barrier case (Heist et al., 2009). Additionally, some studies shows that roadside obstruction to air pollution such as noise barrier, vegetative barrier like tree stands may have impacts on vehicles emissions dispersion [1].The main objective of this study is to model the use of barriers to mitigate pollution dispersion. It is an attractive concept by understanding and applications of barrier to reducing the air pollution. A real case study of dispersion modelling has been simulated by using two types of methods. In this paper, a roadside barrier was designed by using a computation fluid dynamics (CFD). This is to investigate the presence of barrier impact on pollutant dispersion concentration emitted from the industrial or near road traffic.

Computational Fluid Dynamics
Computational Fluid Dynamics (CFD) is part of the study in fluid...

... middle of paper ...

... concentrations V at barrier height 18m with three different velocity, 3.0 m/s, 4.0 m/s, and 5.0 m/s

Above Figure 4 normalized the vertical distribution of concentration for no barrier and different barrier heights by simulated different velocity (3 m/s wind speed, following by 4.0 m/s and 5.0 m/s). At no barrier case, the vertical pressure concentration is increase when the velocity is high. In a barrier case with 6m high, the concentration increase in the vertical lofting at 0-23 Y when the velocity is high and start to decrease when it mix with the clean air above the road and start to reduce the concentration. In Figure 4c, with presence of higher roadside barrier the maximum concentration to occur on and the upper level concentration is higher with bigger velocity. However, the barrier height and absolute concentration is effect with increasing velocity.

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