Construction and efficiency assessment of urban ventilation corridors based on multi-source data:A case study of the main urban area of Hefei City
Urban ventilation corridors play a critical role in mitigating the heat island effect and air pollution and the construction of low-carbon cities.This research utilized a variety of data,including meteorological data,basic geographic information data,and satellite remote sensing data,to calculate urban ventilation indicators in the main urban area of Hefei City.Four scenario evaluation systems were established based on different combinations of indicators,including ventilation potential coefficient(VPC),VPC+high temperature(LST),VPC+haze(PM2.5),and VPC+high temperature(LST)+haze(PM2.5).Subsequently,we employed the least-cost path model to construct ventilation corridors and used Pearson correlation models to assess ventilation efficiency under various scenarios.The findings revealed that:1)We proposed and validated a new paradigm for constructing ventilation corridors—constructing ventilation corridors based on a composite index evaluation system consisting of the VPC and climatic indicators(LST/PM2.5/LST+PM2.5).The VPC was determined by sky view factor and roughness length indicators,while the selection of climate environmental indicators was based on specific climate environmental issues faced by the city.2)The main urban area of Hefei City experiences dominant southeast winds in the summer and northeast winds in the winter.Areas with high values of sky view factor and roughness length indicators are concentrated outside and inside the second ring road,respectively.High LST values are observed in Jingkai District and Baohe District,while high PM2.5 concentration values are found in the old urban area,Baohe District,Xinzhai District,and Yaohai District.3)The paradigm proposed in this study for constructing the ventilation corridor demonstrated high efficiency.Specifically,under the VPC+LST+PM2.5 paradigm,the coefficients of correlation between wind speed level in the ventilation corridor and LST,as well as PM2.5 concentration,were-0.75 and-0.85,respectively.These absolute values were higher than the correlation coefficients of-0.68 and-0.82 obtained from the traditional paradigm based on building form indicators for the ventilation corridor.4)The main urban area of Hefei City featured a two-tiered ventilation corridor management system,designated as"1+7".This structure permitted the implementation of tailored control strategies within the primary and secondary regulatory zones.This study aimed to provide strategic guidelines for improving urban climate resilience at the built environment level.
urban ventilation corridorventilation efficiency assessmentmulti-source datacontrol systemHefei City
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