基于城市雨洪模型的市政排水与水利排涝标准衔接研究

针对目前存在的市政排水与水利排涝两个标准的衔接仍无规范统一方法的问题,以广州市东濠涌流域为研究区域,采用城市综合流域排水模型Info Works ICM建立东濠涌流域管道、河道及地面二维耦合模型,分析计算市政排水1年一遇与水利排涝5年一遇以及市政排水1年一遇与水利排涝10年一遇两种情况下的标准衔接关系,为城市排水防涝规划设计提供技术支撑。结果表明:1年一遇市政排水标准与10年一遇水利排涝标准的组合能够满足流域涝水顺利排除的要求,但管道排水口底高程距河底高程的距离过短也会对管道的水位顶托产生一定影响,故建议城市排水管网的规划建设应至少保证排水口底高程高于河道底高程0.5 m以上。

Study on standard syntaxis of urban drainage between pipe and river based on urban storm flood models

There has been no unified method for the syntaxis of design standards of urban drainage and waterlogging drainage up to now. In order to study the standard syntaxis for two scenarios(municipal drainage of a one-year frequency storm flood with waterlogging drainage of a five-year frequency storm flood, and municipal drainage of a one-year frequency storm flood with waterlogging drainage of a ten-year frequency storm flood)in the Donghaochong Catchment, a two-dimensional urban storm flood model which couples underground drainage pipes, rivers, and surface ground was established using Infoworks ICM, providing technical support for the planning and design of urban drainage waterlogging. The results show that waterlogging will not occur in the Donghaochong Catchment with the combined standards for municipal drainage of a one-year frequency storm flood and waterlogging drainage of a ten-year frequency storm flood. However, the distance from the pipe outlet bottom to the river bottom also impacts the water level in the pipes. Therefore, it is suggested that the elevation of the pipe outlet bottom should be 0. 5 meters higher than the river bottom elevation in the design of urban drainage networks.