滨江城市泵站设计排涝流量计算方法研究

Design Drainage Flow Calculation of Pumping Station in Binjiang City

摘要: 滨江城市地区以堤防挡洪，以泵站排涝，其排涝计算的核心在于确定合理的泵站设计流量，目前尚无可靠的方法。滨江城市排涝计算中复杂的泵站抽排边界是其区别于天然河道非恒定流计算的典型特征，因此，处理泵站抽排边界是合理确定泵站设计流量的关键。论文提出了试算法的处理方法，通过假设泵站流量初值，利用非恒定流试算，以城市河网水位为控制条件，多次试算得到最终泵站设计流量。论文提出了不同的初值赋予方式，列出计算框图，增强了方法适用性。最后该法在南京市河西新城区进行了运用，结果科学可行，为滨江城市地区计算泵站设计排涝流量提供了一种新方法。

Abstract: Riverside cities always prevent flood by embankments, draining water-logging by pump stations, in which the core of drainage calculation is to determine the reasonable design drainage capacity of pump stations. There’s no reliable method at present. During the process of the calculation in riverside cities, the complicated drainage boundary of pump stations has typical characteristics, differing from the boundary of natural unsteady flow calculation. Therefore, the key point is the handling of the drainage boundary to find out the reasonable design drainage capacity of pump stations. A trial and error calculation method is proposed in this paper. By assuming the initial design drainage capacity of pump stations, the final value is obtained by the trial and error calculations of unsteady flow, taking the water level of city river network as controlling condition. Different ways to assume initial values and the flow chart are given, in order to improve the applicability of the proposed method. Hexi New Town of Nanjing City was taken as a case study, results showed that the method is scientific and feasible, which provides a new method to determine the reasonable design drainage capacity of pump stations in riverside cities.