城市地下空间的污染物扩散和脆弱性研究

Study on Diffusion and Vulnerability of Pollutantsin Urban Underground Space

文章选取北京某地铁站作为研究对象,提出一种新的基于污染物扩散态势和人员平均分布密度脆弱性评价指标,用于描述空间内某一位置发生污染气体泄漏或袭击时,该污染源对整个空间的危害程度。根据文章脆弱性分析结果,该地铁站站台层的高风险区域分布在南侧楼梯口处,各位置的脆弱程度随全天时段产生波动,但整体排序保持不变。与单一扩散指标相比,该指标耦合了污染物的扩散趋势及其对内部人员的伤害作用,更加适用于人员密集的实际应用场景。

A new vulnerability index(VI)is proposed to describe the degree of damage to the whole space when the polluted gas leaks or spreads insubway station in Beijing.Vulnerability analysis results for the subway station reveal that the high-risk areas of the subway platform are distributed at the southwest of the floor,and the vulnerability fluctuates slightly in one day.However,the overall ranking of each location remains unchanged.Compared with a single diffusion index,this vulnerability index that couples the diffusion of pollutants and their harmful effects on the internal personnel is more suitable for indoor buildings with dense personnel.