基于Infoworks ICM模型的典型海绵措施径流减控效果评估

Evaluation of runoff reduction effect of typical sponge measures based on Infoworks ICM model

为了分析海绵措施在流域尺度的雨水径流减控效果,提出适用于海绵城市系统建设的最优组合模式。基于Infoworks ICM模型构建马草河综合流域洪涝模型,结合雨水控制与利用工程设计规范,定量评估调蓄池、下凹式绿地及透水铺装海绵组合模式的蓄滞效果。研究结果表明:(a)海绵组合措施对10年一遇以下低重现期降雨径流量、洪峰流量和峰现时间的削减延迟效果较好;当降雨重现期达到10年一遇及以上时,径流量和洪峰流量削减比例不同程度地降低,洪峰流量削减和峰现时间延迟效果明显降低。(b)实施海绵措施后流域年径流量平均削减39%,各管控地块全部满足控制标准,现行雨水设计规范标准有助于支撑海绵城市试点建设。

To analyze the effect of sponge measures on the reduction of rainwater runoff at the watershed scale,this study presented an optimal combination mode for the construction of sponge city system.An integrated flooding and water-logging model for the Macao River was established based on the Infoworks ICM model and following the code for the design of storm water management and harvest engineering to quantitatively evaluate the storage effect of storage ponds,hollow grassland and the permeable pavement sponge combination mode.The results show that the sponge combination measures have better effect on the reduction of rainfall runoff,flood peak discharge and flood peak time in the low-recurring period of less than 10 years.In comparison while the return period of rainfall reaches 10 years and above,the reduction ratio of runoff and flood peak discharge decrease to different extents,and the flood peak discharge reduction and flood peak time delay significantly decrease.After the implementation of the sponge measures,the annual runoff of the basin was reduced by an average of 39%,when all controlled blocks meet the control standards.Current design standards for rainwater can help support the pilot construction of sponge cities.