Dynamic assessment of flood disaster risk in urban places considering crowd activities:A case study in Shenzhen,China
In order to reveal the influence of dynamic crowd activities on urban flood risk,a flood risk assess-ment model for urban places,considering crowd activities,is established to analyze the changes of flood risk in different types of places under 4 time periods:day and night on weekdays and day and night on rest days.4 typical communities in Futian District of Shenzhen are selected as examples.The results show that:1)In addition to the hazard factor,frequent crowd activities also contribute to increased flood risk.The total weight of 3 indicators related to crowd activities is 0.31.2)The flood risk varies significantly across different place types and exhibits dynamic changes with crowd activities.The average risk of living places is higher than all other places,with minmal fluctuation in 4 periods;the average risk of flooding in residential mixed places ranks second highest,and the risk in the evening hours is about 25％higher than that in the daytime;the aver-age risks in commercial places,public service places,and office-related mixed places are also higher,espe-cially during the daytime on weekdays;the risk in green leisure places is the lowest across all four periods.3)There are significant differences in flood risk between living community and comprehensive community,living community is the sustained high-risk community,with the proportion of high-risk places over 40％in all 4 periods,particularly over 60％at night.Comprehensive community presents the characteristic that flood risk is higher during the daytime on weekdays compared to other periods,when the proportion of high-risk places is up to 54％.
万方数据
