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以某城市立交桥下低洼地区的排水系统为对象建立水力模型,从内涝防治的角度探索了雨水口的设计和校核方法。通过模拟不同情景分别计算了雨水口具备不同过流能力时的水力条件,以及相应的地面积水情况。结果表明,当雨水口过流能力不满足设计标准时,管网的排水能力不能得到充分发挥,地面的内涝风险也会显著增加。此外,基于模拟结果对“雨水口能力不足”与“管道能力不足”这两种内涝原因进行了区分,说明分析内涝原因是解决内涝问题的先决条件。
A hydraulic model is set up for the drainage system in a low-lying area under an urban overpass, and the design and checking methods of the rainwater outlet are explored from the perspective of waterlogging prevention and control. By simulating the different scenarios, the hydraulic conditions of the gully with different overcurrent capacity were calculated, and the corresponding ground water conditions were calculated. The results show that when the over-flow capacity of the outlet does not meet the design standards, the drainage capacity of the pipe network can not be fully utilized and the risk of waterlogging on the ground will also increase significantly. In addition, the distinction between the two causes of waterlogging based on the simulation results was made on the causes of waterlogging, such as inadequate capacity of the spigot and inadequate capacity of the pipe, which shows that analyzing the causes of waterlogging is a prerequisite for solving the waterlogging problem.