基于一二维耦合水动力模型的海绵小区建设效果评估

Evaluation of Sponge Community Construction Based on Coupled 1D and 2D Hydrodynamic Model

针对在海绵城市规划、建设和管理中SWMM模型无法精确模拟地表积水和淹没过程的问题,将SWMM模型与基于有限体积法的二维水动力学模型进行了耦合,建立了一二维耦合的水动力学模型,基于耦合模型构建了北京市某排水小区的雨洪模型,采用不同重现期的设计暴雨过程对海绵改造方案进行模拟和分析。结果表明,一二维耦合水动力学模型能有效地模拟海绵措施建设前后的效果,可应用于海绵小区建设效果评估中;海绵措施在一定程度上能改善小区内涝积水情况,间接地提高排水标准。

In the planning,construction and management of sponge cities,the SWMM is a very effective and widely used simulation tool,but the SWMM cannot accurately simulate the flood inundation.Aiming at this problem,the SWMM is coupled with a two-dimensional hydrodynamic model based the finite volume method to establish a coupled 1D and 2D hydrodynamic model.Based on the proposed model,a rainwater management model was established for a community in Beijing.The sponge city construction scheme was simulated and analyzed using the design rainstorm process with different return periods.The results show that the proposed coupled 1D and 2D hydrodynamic model can effectively simulate the effect of sponge measures and can be applied to the evaluation of sponge city construction.Sponge measures can reduce the flood inundation in the community to a certain extent and indirectly improve the drainage standards.