基于SWMM的大型双曲屋面雨水径流模拟

Modeling of Stormwater Runoff in Large Hyperbolic Roof Based on SWMM

以国家速滑馆为例,提出了一种基于暴雨洪水管理模型(SWMM)构建大型双曲屋面雨水径流模型的方法。对研究区域屋面虹吸雨水排水系统在设计暴雨重现期(P)为10、50、100 a情景下的运行状态进行了模拟分析,并结合现场实测数据对模型的可行性进行验证。模拟结果显示,在各重现期下虹吸系统的启动比例均达到了预期,屋面局部积水点比例较小且积水深度处于可控范围内,不会对屋面整体安全性构成威胁,并可根据模拟结果设置挡水板、天沟溢流口等技术措施,对屋面进行雨水系统设计。

A method for establishment of large hyperbolic roof stormwater runoff model based on storm water management model(SWMM)was proposed and applied in the National Speed Skating Oval.The operation status of the roof siphon rainwater drainage system in the study area under scenarios with designed rainfall return period(P)of 10 years,50 years and 100 years was simulated,and the feasibility of the model was verified with on-site measured data.The simulation results showed that the startup ratio of siphon system in each return period was up to the expectation,the proportion of local ponding points in the roof was small and the ponding depth was in a controllable range,which had no threat to the overall safety of the roof.In addition,water baffle,gutter overflow and other technical measures could be adopted to design the roof stormwater system according to the simulation results.