中文摘要：

城市街道积水回流对地下管网排水影响显著,为了反映地表回流的影响,提出了包含街道和管道的双层排水结构模型,通过虚拟连接通道进行地表和地下排水系统的水量交换,并推导了通道过流量的计算方法,实现了街道积水回流的模拟,建立了完整的城市雨洪排涝计算模型。利用典型案例对模型计算进行验证,结果表明：该模型可模拟街面积水和过流过程,在发生街道漫流的情况下,计算结果合理,较传统模拟方法更贴近实际。

英文摘要：

The backflow from urban underground drainage pipe network has great influences on floods draining. To simulate the impact of floods backflow on waterlogging drainage,a double-layer drainage structure including streets and underground pipelines is established. In case of the water exchange between surface and underground drainage systems via virtual connection passage,the calculation formula of pipeline discharge capacity is deduced,which can stimulate the backflow,and a completed numerical calculation model for urban rain flood drainage is established. Classic case verification shows that： the model can simulate the waterlogging on the street and the backflow processes,and the calculation results are reasonable in flooding situations and are more close to the reality compared with traditional simulation methods.