Study on the Impact of Winter Street Canyon Greening Mode on Nitrogen Oxide Diffusion Based on Numerical Simulation

Yao Xiao; Yuanqi Liao

doi:10.6911/WSRJ.202412_10(12).0004

Authors

Yao Xiao
Yuanqi Liao

DOI:

https://doi.org/10.6911/WSRJ.202412_10(12).0004

Keywords:

Street Canyon; Greening mode; Nitrogen oxides; Air quality.

Abstract

This study uses ENVI-met numerical simulation software to analyze the effects of three typical greening patterns (single trees, trees + hedges, and trees + ground cover) on the dispersion of nitrogen oxides (NOx) in a street canyon in Lin'an District, Hangzhou, during winter parallel wind conditions. By simulating the distribution of NOx concentration at the height of the human respiratory zone under various greening modes, it was found that a single tree mode forms a significant high concentration pollution zone in the downwind area; The average NOx concentration of the tree+ground cover model is the highest, indicating that ground cover plants have a significant hindering effect on air flow; The combination of trees and hedgerows showed the lowest average NOx concentration, indicating that hedgerows have a significant effect in blocking pollutant diffusion and improving air flow. Research has shown that reasonable greening configuration plays an important role in improving air quality in street canyons, among which hedgerows have a better control effect on pollutant diffusion than ground cover plants. The results provide scientific basis for the greening design of street canyons in hot summer and cold winter areas, which helps to improve the air quality inside the street canyons, especially in ensuring pedestrian health, and has practical significance. Future research can further explore the impact of seasonal changes and wind speed on different greening modes, in order to optimize greening strategies and air pollution control plans.

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