In this paper, a mathematical model for the urban rainstorm water logging wasestablished on the basis of one- and two-dimensional unsteady flow theory and the technique ofnon-structural irregular grid division. The co...In this paper, a mathematical model for the urban rainstorm water logging wasestablished on the basis of one- and two-dimensional unsteady flow theory and the technique ofnon-structural irregular grid division. The continuity equation was discretized with the finitevolume method. And the momentum equations were differently simplified and discretized for differentcases. A method of ''special passage'' was proposed to deal with small-scale rivers and open channels.The urban drainage system was simplified and simulated in the model. The method of ''open slot'' wasapplied to coordinate the alternate calculation of open channel flow and pressure flow in drainagepipes. The model has been applied in Tianjin City and the verification is quite satisfactory.展开更多
针对近年来发生暴雨时镇江市区内涝积水现象频发的问题,采用城市排水管网模拟系统(Digital Water Simulation)构建镇江市主城区排水管网模型,并对不同降雨情景下的排水管网进行动态仿真模拟。基于模拟结果分析排水管网水力负荷,评估主...针对近年来发生暴雨时镇江市区内涝积水现象频发的问题,采用城市排水管网模拟系统(Digital Water Simulation)构建镇江市主城区排水管网模型,并对不同降雨情景下的排水管网进行动态仿真模拟。基于模拟结果分析排水管网水力负荷,评估主城区排水能力;根据积水深度、积水范围和淹没时间等信息,采用情景评估法,计算内涝风险指数,进行主城区内涝风险评估与区划,为城市防涝综合规划和防涝管理提供参考。展开更多
文摘In this paper, a mathematical model for the urban rainstorm water logging wasestablished on the basis of one- and two-dimensional unsteady flow theory and the technique ofnon-structural irregular grid division. The continuity equation was discretized with the finitevolume method. And the momentum equations were differently simplified and discretized for differentcases. A method of ''special passage'' was proposed to deal with small-scale rivers and open channels.The urban drainage system was simplified and simulated in the model. The method of ''open slot'' wasapplied to coordinate the alternate calculation of open channel flow and pressure flow in drainagepipes. The model has been applied in Tianjin City and the verification is quite satisfactory.
文摘针对近年来发生暴雨时镇江市区内涝积水现象频发的问题,采用城市排水管网模拟系统(Digital Water Simulation)构建镇江市主城区排水管网模型,并对不同降雨情景下的排水管网进行动态仿真模拟。基于模拟结果分析排水管网水力负荷,评估主城区排水能力;根据积水深度、积水范围和淹没时间等信息,采用情景评估法,计算内涝风险指数,进行主城区内涝风险评估与区划,为城市防涝综合规划和防涝管理提供参考。
