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Simulation of Stormwater Flooding Processes in Urban Basin

机译：城市盆地暴雨洪水过程的模拟

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Stormwater flooding frequently occur in urban basins during rainy period, which is often caused by the even terrain of the cities, the lower design standard of drainage systems, or conduits blocked up by construction waste during urban development period. The methods used to design urban drainage system are not suit to analyze surcharge state of storm drainage systems or simulate flooding processes in the cities. Based on numerical solution of the full St.Venant equations, a mathematical model was established which can simulate gravity flow, pressure flow, circumfluence flow, backwater flow and surcharge flow in the storm drainage systems, and analyze flooding cover area, flooding depth and flooding duration during storm period. The flooding processes simulated in the urban basins can be dynamically demonstrated with the aid of GIS. The model was applied to analyze typical storm events in six drain districts of Shanghai city. The results show pressure flows occur in most sewers and water level of some nodes are higher than ground elevation, and the number of the flooding nodes simulated in the districts accord with what investigated basically, which proves the validity and reliability of the model. The model can be used to provide flood information for flood prevention and disaster reduction for the urban basins.
机译：雨水泛滥多发生在雨季期间的城市流域，这通常是由于城市地形平坦，排水系统的设计标准较低或城市发展时期建筑垃圾堵塞了管道造成的。用于设计城市排水系统的方法不适用于分析暴雨排水系统的超载状态或模拟城市中的洪水过程。基于完整的St.Venant方程的数值解，建立了数学模型，该模型可以模拟暴雨排水系统中的重力流，压力流，环流，回水流和附加水流，并分析洪水覆盖面积，洪水深度和洪水暴风雨期间的持续时间。借助GIS可以动态演示城市流域模拟的洪水过程。该模型被用于分析上海市六个流域的典型暴风雨事件。结果表明，大多数下水道均存在压力流，部分节点的水位高于地面高程，各区模拟的洪水节点数量与基本研究相吻合，证明了该模型的有效性和可靠性。该模型可为城市流域的防洪减灾提供洪水信息。

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