基于降雨情景模拟的排水系统内涝风险评估与分析

现今大多数城市建成区雨水管网存在设计标准偏低、源头控制径流能力低等问题,使得内涝风险增加。以某平原水网城市为例,采用地理信息系统(GIS)技术与综合流域排水系统模型InfoWorks ICM相结合的方法,对不同降雨重现期进行情景模拟,分析评估内涝风险,并通过对模拟结果进行水量平衡分析,得出需要通过增设源头LID设施、管道提标改造、合理布置外围排涝设施等措施有针对性地预防内涝发生、降低内涝风险。

Waterlogging Risk Assessment and Analysis of Urban Drainage System Based on Rainfall Scenario Simulation

At present,problems of low design standard and low source control capacity exist in storm pipe network in most urban built-up areas,which increases the risk of waterlogging.Taking a plain river network city for eample,the geographic information system(GIS)technology combined with integrated catchment drainage system model InfoWorks ICM were applied to simulate scenarios at different rainfall return periods,the urban waterlogging risk was analyzed and assessed,and water balance analysis was carried out on the simulation results.It was concluded that measures should be taken to prevent the occurrence of waterlogging and reduce the risk of waterlogging by adding LID facilities at the source,upgrading pipelines,and reasonably arranging peripheral drainage facilities.