河道边界水位对管道排水能力的影响分析

为保证城市排水安全,缓解城市内涝,针对河道排涝水位对管道排水的动态影响问题,选用宿迁市马陵河排水片区为研究区,基于SWMM模型,模拟2、3和5 a重现期暴雨条件下出水口管道分别为自由出流、半淹没出流和完全淹没出流3种情形的管道相对排水能力变化,并在此基础上探求马陵河各分段控制水位。结果表明:管道水流主要受河道高水位作用,即管道完全淹没出流时,排水能力随水位的升高而不断减小,减小程度与末管道高差和水位动态顶托管道水流有关。此结论可为城市排水管网改造及河道调控水位除涝提供科学参考。

Impact analysis of river boundary water level on drainage capacity of pipeline

In order to ensure the safety of urban drainage and alleviate the urban waterlogging, aiming at the dynamic influence of river drainage level on the drainage of pipelines, the draining area of Maling River in Suqian City is chosen as the study area. Based on storm water management model(SWMM), the changes of relative drainage capacity of free-flow pipe, semi-submerged outflow and completely submerged outflow were simulated in the case of design storm return period being 2,3,5 years. And on this basis the Maling River sub-controlled water level was explored. The results showed that the water flow in the pipeline is mainly affected by the high water level. When the pipeline is fully submerged, the drainage capacity decreases with the rise of the water level. The decreasing degree is related to the height difference of the terminal pipe and the water flow by the dynamic backwater effect. This conclusion can provide a scientific reference for pipe network reconstruction and river regulation for waterlogging.