山地城市暴雨洪水中人车失稳风险数值模拟研究OACSTPCD

[Objective]To quantitatively investigate the flood instability risk characteristics of pedestrians and vehicles in mountainous cities,[Methods]a coupled one-and two-hydrological and hydrodynamic model is constructed in Yuelai New City of Chongqing,China.The characteristics of the flood and the exposure of disaster-bearing bodies are simulated and identified under different rainfall scenarios.The flood instability risks of typical pedestrians and vehicles(cars,SUV,adults,children)are computed and investigated from the perspectives of risk areas and durations based on the most unfavor-able principle of flood vulnerability.[Results]Result show that the larger the rainfall return period,the higher the exposure of disaster-bearing bodies,the earlier the instability risks begin and the longer the duration;the flood instability risk of cars is the highest,followed by SUV,and the risk of adults is the lowest.Under different return periods,the proportion of mild risk areas of pedestrians and vehicles is the highest,and their distribution is similar to areas with shallow flood depth(such as below 0.15 m)or flow velocity values below 0.4 m/s.[Conclusion]In the high instability risk areas,the flood charac-teristics tend to be complicated,especially for mountainous cities with large undulating terrains,risk maps should be drawn based on the physical characteristics of the disaster-bearing bodies,and risk warning needs to be carried out combining rain-fall forecasts to promote the emergency management.