| 摘要: |
| 城市道路是城市居民重要的活动场所，人行道空气
质量与居民健康密切相关。行道树被广泛认为会降低道路空气
交换速率，从而造成道路污染物浓度升高；然而，行道树通过
改变湍流形成空气颗粒物浓度差异化分布，同时对颗粒物有一
定截获能力。因此，合理规划行道树有望改变道路空气流场进
而改善局部空气质量。以北京地安门内大街为例，从改善道路
污染的角度展开基于ENVI-met模型的行道树设计与技术探
索，得出：1)ENVI-met可用于道路污染物扩散及沉降模拟
研究；2)行道树冠幅是影响道路颗粒物扩散的重要因素，冠
幅宽度到达道路宽度时，往往会影响颗粒物的快速扩散，导致
道路颗粒物浓度升高；3)冠幅较大且冠层高度靠近地面的行
道树对道路颗粒物有较好的吸附效果。本研究为行道树树种选
择提供有利依据，同时也是国内首次用ENVI-met对颗粒物
扩散和沉降开展研究。 |
| 关键词: 园林植物 行道树 北京 PM10 ENVI-met |
| DOI： |
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| 基金项目: |
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| Research on Species Optimization of TypicalRoad Trees in Beijing Based on ENVI-met |
| ZHOU Shuwen,GAO Fei,MA Keming |
| Abstract: |
| Urban roads are important activity places for citizens,
and sidewalk air quality is closely related to public health. Roadside
trees are widely believed to reduce the ventilation in the road,
resulting in higher pollutants concentrations. However, roadside
trees can form a differentiated distribution of particles concentration
through changing turbulence and have a certain ability to intercept
particles. Therefore, reasonable planning of roadside trees is
expected to change the road air flow field and improve local air
quality. This study took Di'anmen Nei Street as the example to
explore an innovative technological approach on roadside trees
designing based on ENVI-met from the perspective of improving
road pollution. The conclusions are the following: 1) ENVI-met can
be used to simulate the diffusion and settlement of road pollutants;
2) The canopy width is an important factor affecting the diffusion of
particulate matter on the road. When the width of the crown reaches
the width of the road, it will affect the rapid diffusion of particulate
matters, leading to an increase in the concentration of particulate
matter on the road; 3) The roadside tree with a large crown width
and a canopy height close to the ground has better adsorption effect
on the road particles. This study provides a favorable basis for the
selection of roadside tree species. At the same time, it is the first
time that ENVI-met is used in the study of particle diffusion and
deposition in China. |
| Key words: landscape plants roadside tree Beijing PM10 ENVI-met |
