【摘要】 为了科学分析山丘城区防洪排涝能力及其提升措施,以江阴市敔山湾地区为例,运用SWMM建立了可考虑山洪和管网排水的山丘城区水文水动力模型,通过调查溢流点和综合径流系数法实现了无资料地区模型校准。将截洪沟离散化为10 m一段的计算单元,以泰森多边形法对截洪沟控制区域进行划分,实现对沿程变断面和多出水口的截洪沟模拟,计算的最大1 h洪峰流量平均值处于规范值建议范围内。采用整治后的截洪沟尺寸对下游核心规划区的防洪排涝能力进行了复核,提出了适当增加金井河泵站抽水能力并适当降低敔山湖控制水位来增加调蓄库容排涝能力的提升方案。更多还原

【Abstract】 To scientifically investigate the flood control capacity, the drainage capacity and their improvements in the hilly city, taking the Yushan Bay as an example, the hydrologic and hydrodynamic model of hilly city was established based on SWMM(storm water management model), which can consider the torrential flood and drainage network together. Aiming at the un-gauged area, the model calibration was realized through surveying historical overflow points and using the comprehensive runoff coefficient method. In this model, the flood-cutting channels were discretized into calculation units with each section length of 10 m, and their control zones were divided by the Tyson Polygon Method to realize the simulation of the flood-cutting channels with variable sections and multiple outlets. The calculated averages of the maximum one-hour discharge peaks were within the recommended range of the standard value. As the influences of previous rainfall in the study area and the discharge distributions in the flood-cutting channels were considered in the model, the rationality of calculating the discharge peaks of the flood-cutting channels was ensured. Then using the renovated dimensions of the flood-cutting channels, this study calculated the flood control and drainage capacity of the downstream core planning area, and presented an improvement scheme, which is increasing the pumping capacity of Jinjing River Pump Station and reducing the control water level of Yushan Lake to increasing its storage capacity.更多还原