基于关键参数耦合效应的城市排涝设计方法EI北大核心CSCD

为破解城市排涝规划设计中难以选择蓄涝水面率、暴雨历时的问题,提出了基于蓄涝水面率和暴雨历时2个关键参数耦合效应的设计方法,针对常规的平均排除法在部分工况下失效或得出的排涝流量偏小问题进行了改进。该方法能够协调较短历时暴雨及其后续降水过程中的排蓄关系,快速确定蓄涝水面率与暴雨历时耦合条件下的设计指标成果表,进而合理确定关键参数与设计指标的大小。以南昌市沙井电排区为例,借助MIKE模型分析改进前后排涝进程的差异,验证该方法的可靠性;该方法可以弥补常规方法的2个缺陷,实现关键参数耦合条件下的设计指标快速计算,解决其计算结果偏小、难以适应短历时集中强降雨的问题。

Urban drainage design method based on coupling effect of key parameters

In order to solve the problem that it is difficult to select the water surface rate of waterlogging and rainstorm duration in urban drainage planning and design, a design method based on the coupling effect of two key parameters of water surface rate of waterlogging and rainstorm duration was proposed. In view of the failure of the conventional average elimination method under some working conditions or the small drainage flow obtained, the improvement was made. This method can coordinate the relationship between discharge and storage in the short duration rainstorm and its subsequent precipitation process, quickly determine the design index result table under the coupling condition of water surface rate of waterlogging and rainstorm duration, and then reasonably determine the key parameters and design indexes. Taking Shajing electric drainage area in Nanchang City as an example, MIKE model is used to analyze the difference of drainage process before and after improvement, so as to verify the reliability of the method. The results show that the method can make up for the two defects of the conventional method, realize the rapid calculation of the design index under the coupling condition of key parameters, and solve the problem that the calculation result is too small to adapt to the short-duration concentrated heavy rainfall.