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

抄録

This research focuses on evaluating the shape of a tree's crown and its impact on CO₂ dispersion from transportation. CO₂ emissions from motor vehicles can quickly spread and cause poor air quality on the roadside. The design of tree planting is a way to control air quality by reducing CO₂ dispersion. Therefore, the tree's crown shape is an essential element to consider when planting trees, as different crown shapes can have different effects on CO₂ dispersion. Selecting the wrong shape for a tree's crown can have negative consequences for controlling CO₂ dispersion on the roadside.

To evaluate the impact of different tree crown shapes, this research examines five common shapes found in Surabaya city: round, umbrella, oval, conical, and columnar. The study area is created in 3D modelling using Sim Studio tools software. Computational fluid dynamics (CFD) analysis is then used to simulate the spread of CO₂ emissions on the roadside. The simulation involves four scenarios that consider CO₂ dispersion in 0°, 90°, 180°, and 270° wind direction. The last step of this research involves validating the data using correlation analysis.

The results demonstrate that the shape of a tree's crown has a significant impact on CO₂ dispersion. The oval, conical, and columnar shapes are the most suitable for planting along the roadside because they can effectively reduce the dispersion of CO₂ emissions. In contrast, the round and umbrella shapes have the highest CO₂ distribution and are unsuitable for planting along the roadside.