Numbers of constructions have emerged due to the continuous urbanization process and the diversity of building clusters. Meanwhile, frequent global epidemics, such as COVID-19, have raised higher requirements for efficient urban ventilation. Traditional building design is insufficient to quantitatively consider the rationality of urban ventilation and corresponding risk assessments. This study carries out urban safety ventilation research and provides risk assessment models by using simulation and mathematical induction based on on-site measurement data, to realize accurate evaluation of disturbance of building clusters in urban environment, taking an Innovation Base in Chongqing as an example. The Amplification Coefficients on Urban Disturbance (ACUD) of the Innovation Base are respectively σ = 0.047 representing safe evacuation distance for ventilation of new buildings downstream, σ = 0.403 representing origin airflow disturbance retreat of new buildings, σ = 1.261 representing the control range of skyline design, and σ = 4.381 representing urban canopy ventilation boundary. The Comprehensive Risk Coefficient (CRC) of the Innovation Base in the horizontal & vertical direction of CRC = 17.88 and CRC = 102.97 is obtained indicating the infection risk of residents in the vertical direction is 5.76 times greater than that in the horizontal direction. The Comprehensive Pollution Disturbance (CPD) is 1.70692*10 kg/m which can be regarded as the quantitative risk assessment index of the Innovation Base under large public health safety events. This study contributes to effective support of architectural and urban design facing safe ventilation, providing theoretical support for the risk assessments, the resident control and anti-epidemic policies for both governments and residents during the worldwide epidemic situation.

中文翻译：

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基于COVID-19污染的城市通风风险评估模型开发——以重庆某创新基地为例

由于不断的城市化进程和建筑群的多样性，出现了大量的建筑。与此同时，新冠肺炎（COVID-19）等全球疫情的频繁发生，对城市高效通风提出了更高的要求。传统建筑设计不足以定量考虑城市通风的合理性和相应的风险评估。本研究以重庆某创新基地为例，开展城市安全通风研究，基于现场实测数据，采用仿真和数学归纳法，提供风险评估模型，实现城市环境中建筑群扰动的准确评估。创新基地城市扰动放大系数（ACUD）分别为σ=0.047代表新建建筑下游通风安全疏散距离，σ=0.403代表新建建筑源气流扰动退避，σ=1.261代表天际线控制范围设计，σ = 4.381 代表城市冠层通风边界。得出创新基地水平和垂直方向的综合风险系数（CRC）分别为CRC=17.88和CRC=102.97，表明垂直方向居民的感染风险是水平方向的5.76倍。综合污染扰动（CPD）为1.70692*10 kg/m，可作为创新基地在重大公共卫生安全事件下的定量风险评估指标。该研究有助于有效支持面向安全通风的建筑和城市设计，为全球疫情期间政府和居民的风险评估、居民控制和抗疫政策提供理论支持。