Aini, Nurul and Shen, Zhenjiang (2019) The effect of tree planting within roadside green space on dispersion of CO2 from transportation. International Review for Spatial Planning and Sustainable Development, 7 (4). pp. 97-112. ISSN 2187-3666

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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.

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