街道峡谷绿化带设置对空气流场及污染分布的影响模拟研究

Abstract

PDF HTML阅读 XML下载 导出引用 引用提醒 街道峡谷绿化带设置对空气流场及污染分布的影响模拟研究 DOI: 10.5846/stxb201703080392 作者: 作者单位: 中国科学院生态环境研究中心,重庆市农业科学院生物技术研究中心,中国科学院生态环境研究中心,中国科学院生态环境研究中心 作者简介: 通讯作者: 中图分类号: 基金项目: 国家自然科学基金重点项目（41430638）；国家重点研究和发展计划项目（2016YFC0503003）；国家自然科学基金青年科学基金项目（31500381）；城市与区域生态国家重点实验室自主重点项目 Simulation study on the influence of green belt settings on air-flow and pollution distribution in street canyon Author: Affiliation: Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences,Biotechnology Research Center, Chongqing Academy of Agricultural Science,Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences,Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences Fund Project: The National Natural Science Foundation of China (General Program, Key Program, Major Research Plan) 摘要 | 图/表 | 访问统计 | 参考文献 | 相似文献 | 引证文献 | 资源附件 | 文章评论 摘要:合理设置道路绿化带能够改变街道空气流场进而改善空气质量。利用风洞试验结合数值模型的方法测试了树冠形状和绿化带位置对街道峡谷的风场影响。在数值模型中，采用针对植物模型不同高度赋予不同叶面积密度（leaf area density，LAD）值的新方法近似模拟不同树冠形状的植物，通过输入污染源数据，得到风场及污染物浓度数据结果；与风洞试验结果进行对比，验证了其有效性；进而，利用数值模型分析了不同绿化带设置下街道峡谷内行人的污染暴露特征，结果表明：绿化带位置及树冠形状影响街道峡谷中的涡流结构，形成复杂的细小湍流，从而影响街道峡谷中的风环境和污染物分布。阔叶树冠和位于街道峡谷中央的绿化带位置有利于降低行人污染暴露风险。未来研究中，通过增加风洞试验布点、考虑热力作用及气象因子的影响，或许可以提供更加详细的改善街道峡谷微环境的绿化带布局，为城市大气环境管理和绿地系统建设提供科学依据。 Abstract:Reasonable greenbelt setting can change the air flow field, effectivelyoptimizing air quality. In this study, the effects of crown profiles and location of green belts in street canyon were explored by using wind tunnel and numerical model. In numerical part, an innovative method, assigning different leaf area density (LAD) values to different heights of plant models, was used to simulate the crown profiles in the numerical model, and then the pollution source data was input into the simulation system to calculate the wind field data and pollutant concentration data. After simulate calculation, the numerical model was verified by comparing data from simulation results with the the data obtained from wind tunnel experiment. At last, pollutant exposure characteristics of pedestrians in street canyons under different green belts settings were analyzed using the numerical model. The results show that the differences between green belts lacation and crown profile will affect the vortex structure in the street canyon, resulting in complex turbulence, which affects the wind environment and the pollutant distribution in the street canyon. The deciduous profile and the one central green belt are effective in reducing the pedestrians pollutant exposure. In future study, more monitoring points should be set in the wind tunnel and the influence of thermal and meteorological factors should also be embededinto simulation and wind tunnel experiment, so as to provide a more detailed configuration of the green belt in street planning to alleviate the pollution inthe microenvironment in street canyons, and provide better scientific basis for local atmospheric environment management and the design of urban green space. 参考文献 相似文献 引证文献