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山地城市暴雨洪水中人车失稳风险数值模拟研究

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[目的]为定量分析山地城市暴雨内涝中行人和车辆的失稳风险特征，[方法]以重庆市悦来新城某排水片区为研究区域，构建一二维水文水动力耦合模型，对研究区不同降雨情景下的承灾体暴露性进行了模拟分析，按照最不利原则，从失稳风险范围和失稳持续时间等维度计算分析了典型人车(轿车、SUV、成人、儿童)的失稳风险。[结果]结果显示:降雨重现期越大，承灾体暴露性越高，失稳开始时间越早，持续时间越长，轿车的失稳风险最高，SUV次之，成人最小;四类承灾体在不同重现期下的轻微风险区域占比均最大，且其分布与积水深度较浅(如低于0。15 m)或流速值低于0。4m/s的区域分布较为相似。[结论]结果表明:失稳风险等级越高的区域，其面临的洪水特征可能越复杂，尤其对于地形起伏多变的山地城市，应根据承灾体的特征进行风险图绘制，并结合降雨预报进行风险预警，提升灾害应急管理的精细化水平。
Numerical simulation study on the flood instability risk of people and vehicles in mountainous cities
[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.

urban floodnumerical simulationgodunov schemeexposure of disaster-bearing bodyinstability risks of pedestri-ans and vehiclesmountainous cities

刘非、任春娇、陈垚、袁绍春、刘臻、余薇薇

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重庆交通大学水利水运工程教育部重点实验室,重庆 400074

重庆交通大学河海学院,重庆 400074

重庆交通大学环境水利工程重庆市工程实验室,重庆 400074

暴雨内涝 数值模拟 Godunov格式 承灾体暴露性 人车失稳风险 山地城市

重庆市教委科学技术研究计划重庆市科技局技术创新与应用发展专项重点项目重庆交通大学水利水运工程教育部重点实验室开放基金国家自然科学基金

KJ202200775487439CSTB2022TIAD-KPX0200SLK2023B1151709024

2024

10.13928/j.cnki.wrahe.2024.02.006

水利水电技术(中英文)
水利部发展研究中心

水利水电技术(中英文)

CSTPCD北大核心
影响因子：0.456
ISSN：1000-0860
年,卷(期)：2024.55(2)
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