基于SWMM-CCHE2D耦合模型的海绵城市内涝管控效果评价

为了解决暴雨导致的城市内涝，为应急管理提供技术支撑，考虑城市暴雨过程及海绵地表特性，结合城市水文学及水力学原理和芝加哥雨型，建立了SWMM-CCHE2D耦合模型。结合高精度地形数据和降雨、径流实时监测数据，采用SWMM雨洪模型模拟暴雨条件下海绵城市的产流，耦合高精度的二维水动力模型CCHE2D模拟相应的内涝情况。结果表明：暴雨条件下通州海绵区的产汇流具有缓慢下渗和汇流的特性，主要海绵措施的加入对径流削减率会有9.0%~40.6%不同程度的提高，从而减缓内涝，其中，对5年一遇暴雨的效果最显著；在100年一遇暴雨下设计的各种海绵措施中，生物滞留带对径流削减率的提高程度最明显，高达28.4%，透水铺装和绿地也具有较好的效果。

Evaluation of SWMM-CCHE2D Model-Based SpongeCity Inland Food Control Effects

In order to solve the urban waterlogging caused by  rainstorm and provide technical support for emergency management, the SWMM-CCHE2D coupled model was established considering the urban rainstorm process and the characteristics of the sponge surface, combined with the principles of urban hydrology and hydraulics and the Chicago rain pattern. With high-precision topographic data and real-time monitoring data of rainfall and runoff, SWMM stormwater model was used to simulate the runoff of sponge city under rainstorm conditions, coupled with high-precision two-dimensional hydrodynamic model CCHE2D to simulate the corresponding waterlogging conditions. This method is easy to implement. The results show that under heavy rainstorm, the runoff and confluence in Tongzhou has the feature of slow seepage and collection. Major LID facilities have good effects on improving the runoff reduction rate by 9.0%-40.6% and alleviate the inland flooding. Among the design rainstorm, the effect on the five-year return period is the most significant. For all LIDs with the 100-year return period, the effect of bioretention is relatively significant up to 28.4%. The pavement permeability and the effect of green land are also good.