The Effect of Tree Planting within Roadside Green Space on Dispersion of CO₂from Transportation

Abstract

Transportation has become one of the most significant contributors to CO2 in the world because of its fuel usage. Trees are planted on the roadside to reduce levels of CO2 in the air because trees have the ability to absorb CO2 to be used in the photosynthesis process. This ability will be maximized if the dispersion of CO2 is concentrated around the tree. However, there are some differing results from previous studies regarding this. Some research results have found trees can increase CO2 concentration and vice versa. Accordingly, this study aims to evaluate the effect of tree planting on the roadside in dispersing CO2 using a real 3D environment. The methods used in this research are CO2 emission analysis to obtain the amount of CO2. Then, Computational Fluid Dynamics (CFD) analysis is used to simulate the dispersion of CO2 in the study area both without trees and with trees. However, due to the mixing of air and CO2, this simulation uses a scalar mixing analysis. Some conditions are considered, such as the characteristics of buildings, the characteristics of trees, and environmental conditions. The result indicates that trees can decrease the velocity and increase the concentration of CO2 on the roadside but decrease CO2 concentration on the road. Tree planting can decrease the velocity by 4.3% in the value range 0.9-1 m/s. This condition increases CO2 concentration on the roadside. Trees can increase CO2 by 25% on the right of a roadside and increase CO2 concentration by 10% on the left side.

Strategic Landscaping in Tropical Residences: Assessing Outdoor Temperatures, Cooling Energy and Costs

“…In contrast, tree planting can also slow wind velocity by 4.3% in the 0.9-1.0 m/s value range (Aini and Shen, 2019). McPherson, Herrington et al (1988) suggested that in tropical climates, species with lofty trunks and broad branches of tree canopies combined with low shrubs should be used to provide shading and channel wind to the right path.…”

Evaluation of the Shape of Tree Crowns to protect Air Quality on the Roadside from the CO₂ Dispersion produced by Transportation

“…Planting trees on the roadside can be a solution to decrease CO2 concentration on the roadside. Gromke and Ruck (2010), Janhäll (2015), Li, Lu, et al (2016), Šíp and Beneš (2016), Aini and Shen (2019) have shown that areas with trees have lower dispersion of traffic emissions than sites without trees. However, the existence of these trees must also be supported by a good design.…”