极端降雨情况下,城市道路作为地表行泄通道联合雨水管道有组织地高效排放洪涝,是一种经济高效的内涝防治技术。但由于道路交叉口的分流缺乏可用计算工具,难以确定下游路段排涝流量而导致该技术应用存在障碍。本研究以城市道路T型交叉口为对象,分别针对自由出流、主路顶托、两端顶托三种下游边界条件,开展了水工试验和计算流体力学(CFD)数值模拟试验,使用所获取数据构建了高精度低阶的交叉口流量分配模型,计算误差在±15%以内。该模型可为工程应用提供简明计算工具,而且可以与国内外广泛应用的一维城市雨洪模型SWMM耦合提高其对交叉口节点计算精度以进行道路大排水设计。

During extreme rainfall events, urban roads functioning as surface runoff conduits in conjunction with drainage systems represent an economically efficient technique for flood mitigation. However, due to the lack of available calculation tools for flow diversion at road intersections, it is difficult to determine the drainage flow of downstream road sections, resulting in obstacles to the application of this technology. This study focused on T-shaped intersections within urban road networks and conducted hydraulic experiments and Computational Fluid Dynamics (CFD) numerical simulations for three distinct downstream boundary conditions: free outflow, backwater at main road end, and backwater at both road ends. A high-precision and low order intersection flow diversion model was constructed using the obtained data, with a calculation error basically within ± 15%. The flow diversion model provides a direct and straightforward computational tool for engineering applications. Also, it allows seamless integration with the widely used one-dimensional urban hydrological model SWMM (Storm Water Management Model), significantly enhancing the computational accuracy of the SWMM model at intersection nodes, thereby enabling the precise design of the entire large-scale road major drainage system.

TU997

国家自然科学基金项目（面上项目，重点项目，重大项目）(52070027)