ZHOULing,LUYan-qing.SWMM Simulation Capability for Transient Flow in Drainage Pipe[J].China Water & Wastewater,2022,38(5):108-115.
排水管道瞬变流的SWMM模拟能力研究
- Title:
- SWMM Simulation Capability for Transient Flow in Drainage Pipe
- 关键词:
- 暴雨洪水管理模型（SWMM）; 排水管道; 瞬变流; Preissmann狭缝法
- Keywords:
- storm water management model (SWMM); drainage pipe; transient flow; Preissmann slot method
- 摘要:
- 暴雨洪水管理模型（SWMM）在城市雨洪管理中发挥了重要作用，但对其模拟排水管道瞬变流的能力研究较少。针对排水管道中有压水力瞬变情况，以经典特征线法为参照，对SWMM的模拟能力进行了分析及改进。计算结果发现，原SWMM模型对排水管道快速有压瞬变流的模拟能力较差。为此，提出了“设置虚拟节点、修改Preissmann狭缝宽度”的改进方法，可有效提高SWMM模拟瞬变流的计算精度；同时，进一步分析了空间步长、波速、管段管径比、CFL稳定性条件、收敛精度及节点最小表面积等关键参数对模拟准确度、稳定性、计算效率的影响，并给出了建议取值范围。
- Abstract:
- Storm water management model (SWMM) plays an important role in urban stormwater management. However, its capability to simulate transient flow in drainage pipes is seldom investigated. The simulation capability of SWMM in drainage pipes with pressurized hydraulic transient was analyzed and improved by taking the classic method of characteristics as a reference. The original SWMM had poor capability to simulate rapid pressurized transient flow in drainage pipes. Therefore, the modified method of setting virtual nodes and modifying the width of the Preissmann slot was introduced, which could effectively improve the numerical accuracy of SWMM for transient flow simulation. Moreover, the effects of key parameters such as space step, wave velocity, ratio of pipe length and diameter, CFL rules, convergence accuracy and minimum node surface area on simulation accuracy, stability and calculation efficiency were further analyzed, and the recommended value ranges were proposed.
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