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首页> 外文期刊>Building and Environment >Impacts of tree-planting pattern and trunk height on the airflow and pollutant dispersion inside a street canyon
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Impacts of tree-planting pattern and trunk height on the airflow and pollutant dispersion inside a street canyon

机译：植树方式和树干高度对街道峡谷内气流和污染物扩散的影响

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This study investigates the impacts of tree-planting pattern and tree trunk height on the flow structure and pollutant dispersion inside a street canyon using the numerical model validated by wind tunnel dataset. The isolated canyon of L/H = 10 and W/H = 2 with trees are simulated considering the center tree-planting (CTP) and double rows tree-planting (DRTP) patterns as well as eight trunk heights under perpendicular approaching wind. The results reveal that tree-planting pattern and especially the trunk height affect significantly the flow and pollutant distributions. For each tree-planting pattern, the biggest characteristic of flow structure is, a strong stream of air passes through the canyon, resulting in the disappearance of canyon vortex and corner eddies at the canyon ends when h >= H. When compared to treeless case: trees lead to reduced ACH (air exchange rate) ranging from H/3 to 8H/9 and enhanced ACH at h = H and 10H/9; averaged/maximum concentration increases on wall A and slight decreases on wall B are found at h ranging from H/3 to 7H/9, while concentration dramatic decreases on wall A and significant increases on wall B are observed at h = H and 10H/9. Compared to the CTP counterpart, the DRTP present the similar flow structures, ACH and concentration distributions, which indicates that when the total volume and trunk height of trees are the same, the tree-planting patterns have little impacts on the flow structure and concentration distribution. This study will provide technical support for urban road planning to control air pollution.
机译：本研究使用风洞数据集验证的数值模型研究了树木种植方式和树干高度对街道峡谷内流动结构和污染物扩散的影响。考虑到中心植树（CTP）和双行植树（DRTP）模式以及垂直逼近风下的八个树干高度，模拟了L / H = 10和W / H = 2的树木孤立峡谷。结果表明，植树方式，尤其是树干高度，显着影响水流和污染物的分布。对于每种植树模式，流动结构的最大特点是，强大的空气流穿过峡谷，导致当h> = H时峡谷涡旋和峡谷末端的涡流消失。与无树情况相比：树木导致ACH（空气交换率）从H / 3降低到8H / 9，并在h = H和10H / 9时提高ACH；在h / H到7H / 9范围内，在A壁上平均/最大浓度增加而在B壁上略有降低，而在h = H和10H /时，在A壁上浓度急剧下降而在B壁上显着增加。 9。与CTP相比，DRTP具有相似的流量结构，ACH和浓度分布，这表明当树木的总体积和树干高度相同时，植树方式对流量结构和浓度分布的影响很小。 。这项研究将为控制空气污染的城市道路规划提供技术支持。

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