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针对城市排水干渠既承接上游山区洪水,又沿途接纳城市雨水管道涝水的特性,以湖北省黄石市某排水干渠为例,提出了城市干渠排涝流量计算模型。模型将城市干渠汇水区域划分为山地子排区和城市子排区,在子排区层面分别利用单位线法(山区)和MIKE SWMM模型(城区)建立暴雨径流模型,然后在共同的排水通道(城市干渠)层面建立了MIKE11水动力学模型。该模型既考虑了山洪以沟渠为主要排水方式的特点,又考虑了城区涝水以雨水管网为主要排水方式的特点,同时可以模拟排水干渠下游受顶托的情况。相对于传统的单位线法,水力模型法计算的径流总量大、峰值流量小、峰现时间早。该研究可为城市排水干渠排涝流量计算方法的选择及其合理取值提供参考。
In view of the fact that the urban drainage canal not only inherits the flood of upstream mountainous area but also accepts the waterlogging of urban stormwater pipes along the way, taking a drainage canal of Huangshi City of Hubei Province as an example, this paper presents a calculation model of drainage flow of urban trunk canal. The model divides the urban trunk canal catchment area into mountainous sub-district and urban sub-district. At the sub-district level, the stormwater runoff model is established by unit line method (mountainous area) and MIKE SWMM model (urban area) respectively, and then the common drainage channel (Urban trunk) level established MIKE11 hydrodynamic model. The model takes into account the characteristics of the floodwater taking the ditches as the main drainage way, and also takes into account the characteristics of the flood water in the urban area taking the rainwater pipe network as the main drainage way, and can simulate the conditions of the top-supporting of the drainage ditches downstream. Compared with the traditional unit-line method, the total runoff calculated by the hydraulic model method is large, the peak flow is small, and the peak appears earlier. This study can provide reference for the selection of drainage flow calculation method and its reasonable value for urban drainage canal.