南京步行街空间形式与微气候关联性模拟分析技术

Simulation analysis on relationship between spatial form and microclimate of pedestrian street in Nanjing

为了研究城市步行街空间形态对其微气候的影响,选择Envi-met微气候数值模拟软件对南京市3条不同类型步行街2014年6月21日的空气温度分布、风速分布、湿度分布及太阳辐射强度4项微气候指标进行模拟分析.借鉴奥尔基亚室外生物气候分析表评估狮子桥步行街、南捕厅步行街和河西奥体步行街微气候质量,其中狮子桥步行街微气候质量最高,南捕厅步行街次之,河西步行街最差.模拟结果表明,街道朝向、断面形式、天空可视域、植被分布因子均对街道微气候环境产生不同程度的影响.在此基础上,探讨了基于微气候优化的步行街规划设计策略.

To study the influences of the spatial form of pedestrian streets on urban microclimate,four parameters,including air temperature,relative humidity,wind speed,and solar radiation of three different kinds of streets on June 21,2014 in Nanjing city were simulated by applying Envi-met software. The microclimate environments of the Shiziqiao street,Nanbuting street,and Hexi street were evaluated based on the Olgyay＇s bioclimatic evaluating index,among which the Shiziqiao street was a street with better micro-climate environment than the other two streets,and Nanbuting street was better than Hexi street. Results showthat direction,section form,sky-viewfactor,and green have different impacts on the street microclimate. Based on the research,some strategies are suggested to improve the microclimate conditions of the pedestrian streets.